JP6699424B2 - Charger - Google Patents

Description

  The present invention relates to a charger including a storage battery.

  As a charger equipped with a storage battery, for example, in order to prevent the power output from the grid power supply from exceeding the contracted power, not only the power output from the grid power supply but also the power output from the storage battery is installed in the vehicle. There is one that charges the storage battery. Related techniques include, for example, Patent Documents 1 and 2.

  In the charger configured in this way, in order to prevent the power output from the grid power supply from exceeding the contracted power due to the output of desired power from the storage battery provided in the charger, It is desirable to know the service life and charge rate of the storage batteries provided.

As a method of grasping the life and charge rate of the storage battery, for example, there is a method of using the full charge capacity of the storage battery.
However, since the full charge capacity of the storage battery decreases as the storage battery ages, it needs to be estimated regularly.

  As a method of estimating the full charge capacity of the storage battery, for example, there is a method of using a value obtained by integrating the current flowing through the storage battery being charged (integrated current amount). Further, as a method of increasing the estimation accuracy of the full charge capacity of the storage battery, for example, by increasing the integrated current amount of the storage battery being charged, a method of reducing the influence of the detection error of the current detection unit that detects the current flowing through the storage battery. There is. As a related technique, there is Patent Document 3, for example.

JP, 2014-138534, A JP, 2014-033554, A JP, 2014-187853, A

  However, as described above, when the integrated current amount during charging is used for estimating the full charge capacity of the storage battery provided in the charger, the storage battery is supplied with electric power and the storage battery is discharged during the estimation of the full charge capacity. If so, it is difficult to increase the integrated current amount, and there is a concern that the accuracy of estimating the full charge capacity cannot be improved.

  An object of one aspect of the present invention is to accurately estimate the full charge capacity of a storage battery included in a charger.

  A charger, which is one mode of the present invention, is a charger that supplies electric power to a first vehicle, and includes a first storage battery, a charging rate of the storage battery at the end of charging, and a charging of the storage battery at the start of charging. The difference between the rate and the full charge capacity estimation unit that estimates the full charge capacity of the storage battery by dividing the cumulative current amount of the storage battery being charged, and the power output from the grid power supply so that the power does not exceed the threshold. A power supply control unit that controls power supply from the power supply to the vehicle, power supply from the system power supply to the first storage battery, and power supply from the first storage battery to the first vehicle.

  In addition, the power supply control unit is configured to supply power to the first storage battery from the system power supply in order to estimate the full charge capacity of the first storage battery, even if the first vehicle is connected to the charger. No power is supplied from the first storage battery to the first vehicle.

  According to the present invention, it is possible to accurately estimate the full charge capacity of a storage battery included in a charger.

It is a figure which shows an example of the charger of embodiment. It is a flowchart which shows an example of operation|movement of a full charge capacity estimation part. It is a flow chart which shows an example of operation of an electric power supply control part.

Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a charger according to the embodiment.
The charger 1-1 shown in FIG. 1 supplies the electric power output from the system power supply P to the vehicle Ve-1 (first vehicle) via the charging cable Ca-1 so that the vehicle Ve-1 is supplied with the electric power. The mounted storage battery B-1 is charged. Similarly, the charger 1-2 (another charger) shown in FIG. 1 supplies the electric power output from the system power supply P to the vehicle Ve-2 (second vehicle) via the charging cable Ca-2. As a result, the storage battery B-2 mounted on the vehicle Ve-2 is charged. The vehicle Ve-1 and the vehicle Ve-2 are electric forklift trucks or electric vehicles.

  In addition, the charger 1-1 includes a power conversion unit 2-1, a storage battery 3-1 (first storage battery), switches 4-1 to 6-1, a current detection unit 7-1, and a charging rate estimation. The unit 8-1, the control unit 9-1, and the display unit 10-1 are provided. Similarly, the charger 1-2 includes a power conversion unit 2-2, a storage battery 3-2 (second storage battery), switches 4-2 to 6-2, a current detection unit 7-2, and a charging rate. The estimation unit 8-2, the control unit 9-2, and the display unit 10-2 are provided.

  The power conversion unit 2-1 converts the power output from the system power supply P from AC to DC and supplies the power to the vehicle Ve-1, thereby charging the storage battery B-1 mounted on the vehicle Ve-1. .. Similarly, the power conversion unit 2-2 converts the electric power output from the system power supply P from AC to DC and supplies the electric power to the vehicle Ve-2, so that the storage battery B-2 mounted on the vehicle Ve-2. To charge. The power conversion unit 2-1 and the power conversion unit 2-2 are assumed to be configured by AC/DC converters, for example.

  Moreover, the power converter 2-1 charges the storage battery 3-1 by converting the power output from the system power supply P from AC to DC and supplying the power to the storage battery 3-1. Similarly, the power conversion unit 2-2 converts the power output from the system power supply P from AC to DC and supplies the power to the storage battery 3-2 to charge the storage battery 3-2.

  The storage battery 3-1 charges the storage battery B-1 mounted on the vehicle Ve-1 by supplying electric power to the vehicle Ve-1. Similarly, the storage battery 3-2 charges the storage battery B-2 mounted on the vehicle Ve-2 by supplying electric power to the vehicle Ve-2. In addition, the storage battery 3-1 and the storage battery 3-2 shall be comprised by one or more lithium ion batteries, a nickel hydrogen battery, or an electric double layer capacitor, for example.

  The switch 4-1 is provided on the power line L1-1 connecting the power conversion unit 2-1 and the charging cable Ca-1, and the switch 5-1 is the power line connecting the power conversion unit 2-1 and the storage battery 3-1. The switch 6-1 is provided on the L2-1, and the switch 6-1 is provided on the power line L3-1 that connects the storage battery 3-1 and the charging cable Ca-1. When the switch 4-1 is closed, the power output from the power converter 2-1 is supplied to the vehicle Ve-1, and when the switch 5-1 is closed, the power is output from the power converter 2-1. Electric power is supplied to the storage battery 3-1, and when the switch 6-1 is closed, the electric power output from the storage battery 3-1 is supplied to the vehicle Ve-1. Similarly, the switch 4-2 is provided on the power line L1-2 that connects the power conversion unit 2-2 and the charging cable Ca-2, and the switch 5-2 includes the power conversion unit 2-2 and the storage battery 3-2. The switch 6-2 is provided on the power line L2-2 that connects the storage battery 3-2 and the charging cable Ca-2. When the switch 4-2 is closed, the power output from the power converter 2-2 is supplied to the vehicle Ve-2, and when the switch 5-2 is closed, the power is output from the power converter 2-2. Electric power is supplied to the storage battery 3-2, and when the switch 6-2 is closed, the electric power output from the storage battery 3-2 is supplied to the vehicle Ve-2. The switches 4-1 to 6-1 and the switches 4-2 to 6-2 are assumed to be configured by semiconductor switches such as MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or electromagnetic relays.

The current detector 7-1 detects the current flowing through the storage battery 3-1. Similarly, the current detector 7-
2 detects the electric current which flows into the storage battery 3-2. The current detection unit 7-1 and the current detection unit 7-2 are assumed to be configured by, for example, Hall elements or shunt resistors.

  The charging rate estimation unit 8-1 estimates the charging rate of the storage battery 3-1 based on the voltage of the storage battery 3-1 and the like. Similarly, the charging rate estimation unit 8-2 estimates the charging rate of the storage battery 3-2 based on the voltage of the storage battery 3-2 and the like. For example, the charging rate estimation unit 8-1 stores the correspondence relationship between the open circuit voltage OCV (Open Closed Voltage) of the storage battery 3-1 and the charging rate SOC (State Of Charge) stored in a storage unit (not shown). The charging rate SOC of the storage battery 3-1 corresponding to the current open circuit voltage OCV of the storage battery 3-1 is obtained by referring to the information shown, and the obtained charging rate SOC is set as the current charging rate of the storage battery 3-1. . In addition, the charging rate estimation part 8-1 may make the voltage of the storage battery 3-1 when the switch 5-1 is open the current open circuit voltage OCV of the storage battery 3-1. The current open circuit voltage OCV of the storage battery 3-1 may be calculated using the closed circuit voltage of the storage battery 3-1 and the correction value when it is closed. The charging rate estimating unit 8-1 and the charging rate estimating unit 8-2 are, for example, a CPU (Central Processing Unit), a multi-core CPU, or a programmable device (FPGA (Field Programmable Gate Array) or PLD (Programmable Logic Device)). ).

  In addition, the charging rate estimation unit 8-1 integrates the current detected by the current detection unit 7-1 during the estimation of the full charge capacity of the storage battery 3-1 (during the charging of the storage battery 3-1), so that the storage battery 3 The integrated current amount [Ah] of −1 is calculated. Similarly, the charging rate estimation unit 8-2 accumulates the current detected by the current detection unit 7-2 during estimation of the full charge capacity of the storage battery 3-2 (during charging of the storage battery 3-2) to obtain the storage battery. The integrated current amount [Ah] of 3-2 is obtained. In addition, the charging rate estimation unit 8-1 sets the charging rate of the storage battery 3-1 before the start of charging to the integrated current amount [Ah] of the storage battery 3-1 being charged, and the full charge capacity [Ah] of the storage battery 3-1. The charging rate of the storage battery 3-1 being charged may be obtained by adding the values divided by. Similarly, the charging rate estimating unit 8-2 sets the charging rate of the storage battery 3-2 before the start of charging to the cumulative current amount [Ah] of the storage battery 3-2 being charged, and the full charge capacity [Ah] of the storage battery 3-2. ], the charging rate of the storage battery 3-2 during charging may be calculated.

  The control unit 9-1 includes a full charge capacity estimation unit 91-1 and a power supply control unit 92-1. Similarly, the control unit 9-2 includes a full charge capacity estimation unit 91-2 and a power supply control unit 92-2. The control unit 9-1 may be provided with the charging rate estimation unit 8-1 and the control unit 9-2 may be provided with the charging rate estimation unit 8-2. Further, the control unit 9-1 and the control unit 9-2 are assumed to be configured by, for example, a CPU, a multi-core CPU, or a programmable device. For example, the CPU, the multi-core CPU, or the programmable device executes a predetermined program so that the charging rate estimating units 8-1 and 8-2, the full charge capacity estimating units 91-1 and 91-2, and the power supply control unit. 92-1 and 91-2 are realized.

  When the full charge capacity estimation unit 91-1 estimates the full charge capacity of the storage battery 3-1, the charger 1-1 is the master and the charger 1-2 is the slave. Further, when the full charge capacity estimation unit 91-2 estimates the full charge capacity of the storage battery 3-2, the charger 1-2 becomes the master and the charger 1-1 becomes the slave. Further, in FIG. 1, two chargers 1-1 and 1-2 are connected to the system power supply P, the charger 1 that performs full charge capacity estimation is the master, and the charger 1 that does not perform full charge capacity estimation is a slave. However, also in a configuration in which three or more chargers 1 are connected to the system power supply P, similarly, the charger 1 that performs full charge capacity estimation becomes the master, and charging that does not perform full charge capacity estimation. It is assumed that the container 1 is a slave.

  When the charger 1-1 is the master, the power supply control unit 92-1 outputs electric power from the system power supply P (system power supply P based on the output current of the system power supply P detected by the current detection unit D). From the electric power output to the chargers 1-1 and 1-2). Similarly, when the charger 1-2 is the master, the power supply control unit 92-2 determines the power output from the system power supply P based on the output current of the system power supply P detected by the current detection unit D. Ask. The current detection unit D is, for example, a Hall element or a shunt resistor.

  In addition, when the charger 1-1 is the master, the power supply control unit 92-1 prevents the power output from the system power supply P from exceeding the threshold value Wth (for example, contract power) (by the current detection unit D). By controlling the operations of the power conversion unit 2-1 and the switches 4-1 to 6-1 so that the detected current does not exceed the threshold value Ith (for example, the value obtained by dividing the contract power by the constant voltage Vc). The power supply from the system power supply P to the vehicle Ve-1, the power supply from the system power supply P to the storage battery 3-1, and the power supply from the storage battery 3-1 to the vehicle Ve-1 are controlled. Similarly, when the charger 1-2 is the master, the power supply control unit 92-2 ensures that the power output from the system power supply P does not exceed the threshold value Wth (the current detected by the current detection unit D is By controlling the operations of the power conversion unit 2-2 and the switches 4-2 to 6-2 so as not to exceed the threshold value Ith), power is supplied from the system power supply P to the vehicle Ve-2, and the system power supply P is connected to the storage battery. The power supply to 3-2 and the power supply from the storage battery 3-2 to the vehicle Ve-2 are controlled.

  In addition, when the charger 1-1 is a slave, the power supply control unit 92-1 is based on the instruction sent from the power supply control unit 92-2, and the power conversion unit 2-1 and the switch 4-1. By controlling the operations of ˜6-1, the system power supply P supplies power to the vehicle Ve-1, the system power supply P supplies power to the storage battery 3-1, and the storage battery 3-1 supplies to the vehicle Ve-1. Control power supply. Similarly, the power supply control unit 92-2, when the charger 1-2 is a slave, based on the instruction sent from the power supply control unit 92-1 the power conversion unit 2-2 and the switch 4-. By controlling the operations of 2 to 6-2, the power supply from the system power supply P to the vehicle Ve-2, the power supply from the system power supply P to the storage battery 3-2, and the storage battery 3-2 to the vehicle Ve-2. Control the power supply of.

  When the charger 1-1 is the master, the display section 10-1 displays a predetermined message sent from the power supply control section 92-1. Similarly, when the charger 1-2 is the master, the display unit 10-2 displays a predetermined message sent from the power supply control unit 92-2. The display unit 10-1 and the display unit 10-2 are, for example, liquid crystal displays.

  In addition, when the charger 1-1 is a slave, the display unit 10-1 displays a predetermined message sent from the power supply control unit 92-2 via the power supply control unit 92-1. Similarly, when the charger 1-2 is a slave, the display unit 10-2 displays a predetermined message sent from the power supply control unit 92-1 via the power supply control unit 92-2.

FIG. 2 is a flowchart showing an example of the operation of the full charge capacity estimation unit 91-1. Note that the charger 1-1 is a master and the charger 1-2 is a slave.
First, when the full-charge-capacity estimating unit 91-1 receives from the power supply control unit 92-1 that the full-charge-capacity estimation is possible (S21: Yes), the full-charge-capacity estimation is started. It is sent to the unit 8-1 and the power supply control unit 92-1 (S22). When the charging rate estimation unit 8-1 receives the notification that the full charging capacity estimation is started, the charging rate estimation unit 8-1 waits until the storage battery 3-1 becomes fully charged (for example, until the charging rate of the storage battery 3-1 reaches 100[%]). ), the charging rate and the integrated current amount of the storage battery 3-1 are sent to the full charge capacity estimation unit 91-1 every time a certain period of time elapses.

  Next, the full charge capacity estimation unit 91-1 receives the charging rate and the integrated current amount of the storage battery 3-1 from the charging rate estimation unit 8-1 until the storage battery 3-1 is fully charged (S23, S24). : No). For example, the full-charge-capacity estimating unit 91-1 sends the fact that the full-charge-capacity estimation is started to the charge-rate estimating unit 8-1, and then the charge-rate estimating unit 8-1 first receives the charge-rate. The charging rate of the storage battery 3-1 at the start of full charge capacity estimation (at the start of charging) is stored in a storage unit (not shown). Further, the full charge capacity estimation unit 91-1 sends the fact that the full charge capacity estimation is started to the charging rate estimation unit 8-1, and then the charging rate last sent from the charging rate estimation unit 8-1. , The accumulated current amount sent from the charge rate estimation unit 8-1 at the end while being stored in a storage unit (not shown) as the charge rate of the storage battery 3-1 at the end of full charge capacity estimation (at the end of charge). The integrated current amount of the storage battery 3-1 during full charge capacity estimation (charging) is stored in a storage unit (not shown). Further, when the charging rate of the storage battery 3-1 sent from the charging rate estimation section 8-1 becomes 100 [%], the full charge capacity estimation section 91-1 determines that the storage battery 3-1 is in a fully charged state. to decide.

  Next, when the storage battery 3-1 is in a fully charged state (S24: Yes), the full charge capacity estimation unit 91-1 and the charge rate of the storage battery 3-1 at the end of full charge capacity estimation (at the end of charging) and the full charge capacity. The result of dividing the accumulated current amount of the storage battery 3-1 during full charge capacity estimation (during charging) by the difference from the charging rate of the storage battery 3-1 at the start of charging capacity estimation (at the start of charging) of the storage battery 3-1. The full charge capacity of the storage battery 3-1 is estimated by setting the full charge capacity (S25).

Then, the full charge capacity estimation unit 91-1 sends a notification that the full charge capacity estimation is completed to the power supply control unit 92-1 (S26).
FIG. 3 is a flowchart showing an example of the operation of the power supply control unit 92-1. Note that the charger 1-1 is a master and the charger 1-2 is a slave.

  First, when a predetermined time (for example, 30 days or 720 hours) has passed since the previous estimation of the full charge capacity (S31: Yes), the power supply control unit 92-1 determines that the storage battery 3-1 is in full charge capacity estimation. The full charge capacity estimated current If flowing in 3-1 is acquired (S32), and the required current I1 (first required current) of the vehicle Ve-1 and the required current I2 (second required current) of the vehicle Ve-2 are obtained. Is acquired (S33). For example, the power supply control unit 92-1 receives from the full charge capacity estimation unit 91-1 the maximum value of the currents that the storage battery 3-1 wants to flow during the full charge capacity estimation of the storage battery 3-1, and receives the maximum value. The maximum value is the full charge capacity estimated current If. In addition, the power supply control unit 92-1 determines the maximum value of the currents to be supplied to the storage battery B-1 during estimation of the full charge capacity of the storage battery 3-1 and during charging of the storage battery B-1 to the vehicle Ve-. 1 is received, and the received maximum value is set as the required current I1. In addition, the power supply control unit 92-1 estimates the amount of current to be supplied to the storage battery B-2 while estimating the full charge capacity of the storage battery 3-1 and charging the storage battery B-2 mounted on the vehicle Ve-2. The maximum value is received from the vehicle Ve-2, and the received maximum value is set as the required current I2. In addition, when the vehicle Ve-1 is not connected to the charger 1-1, the required electric power I1 becomes zero, and when the vehicle Ve-2 is not connected to the charger 1-2, the required electric current I2 becomes zero. Become.

  Next, the power supply control unit 92-1 starts the first power supply control when the sum of the full-charge capacity estimated current If, the required current I1, and the required current I2 is less than or equal to the threshold value Ith (S34: Yes). Then, (S35), thereafter, the fact that the full charge capacity estimation is possible is sent to the full charge capacity estimation unit 91-1 (S36), and the fact that the full charge capacity estimation is completed is received from the full charge capacity estimation unit 91-1. (S37: Yes), the current power supply control ends. For example, as the first power supply control, the power supply control unit 92-1 closes the switch 5-1 and supplies the power according to the full charge capacity estimated current If from the power conversion unit 2-1 to the storage battery 3-1. Then, the switch 6-1 is opened so that electric power is not supplied from the storage battery 3-1 to the vehicle Ve-1. This makes it possible to prevent power from being supplied from the system power supply P to the storage battery 3-1 and from being supplied from the storage battery 3-1 to the vehicle Ve-1 during estimation of the full charge capacity of the storage battery 3-1. In addition, the power supply control unit 92-1 closes the switch 4-1 as the first power supply control, causes the power conversion unit 2-1 to supply power corresponding to the required current I1 to the vehicle Ve-1, and switches the power supply control unit 92-1. 4-2 is closed and the electric power according to the required current I2 is supplied from the electric power conversion unit 2-2 to the vehicle Ve-2. Thereby, charging of the storage batteries B-1 and B-2 can be completed at a desired time.

  On the other hand, the power supply control unit 92-1 determines that the sum of the full-charge capacity estimated current If, the required current I1, and the required current I2 is larger than the threshold value Ith (S34: No), and the storage battery 3-2 is charged. When the rate is equal to or higher than a predetermined value (for example, 60 [%]) (S38: Yes), the second power supply control is started (S39), and thereafter, it is indicated that the full charge capacity can be estimated. When it is sent to the estimation unit 91-1 (S36) and the fact that the full charge capacity estimation is completed is received from the full charge capacity estimation unit 91-1 (S37: Yes), the current power supply control is terminated. For example, as the second power supply control, the power supply control unit 92-1 closes the switch 5-1 and supplies power according to the full charge capacity estimated current If from the power conversion unit 2-1 to the storage battery 3-1. Then, the switch 6-1 is opened so that electric power is not supplied from the storage battery 3-1 to the vehicle Ve-1. This makes it possible to prevent power from being supplied from the system power supply P to the storage battery 3-1 and from being supplied from the storage battery 3-1 to the vehicle Ve-1 during estimation of the full charge capacity of the storage battery 3-1. In addition, as the second power supply control, the power supply control unit 92-1 closes the switch 4-1 to supply electric power according to the required current I1 from the power conversion unit 2-1 to the vehicle Ve-1 to switch. 6-2 is closed, and the electric power corresponding to the electric power corresponding to the required current I2 is supplied from the storage battery 3-2 to the vehicle Ve-2. Thus, when there is no margin in the electric power output from the system power supply P, the electric power output from the storage battery 3-2 compensates for the electric power that is insufficient by giving priority to the electric power supply to the storage battery 3-1. You can In the second power supply control, the switch 4-2 may be opened so that power is not supplied from the system power supply P to the storage battery 3-2 of the vehicle Ve-2. As a result, the current detected by the current detection unit D can fall below the threshold value Ith.

  Further, the power supply control unit 92-1 determines that the sum of the full charge capacity estimated current If, the required current I1, and the required current I2 is larger than the threshold value Ith (S34: No), and the storage battery 3-2 is charged. When the rate is smaller than the predetermined value (S38: No) and the priority of the power supply to the vehicle Ve-2 is higher than the priority of the power supply to the vehicle Ve-1 (S40: Yes), the third Power supply control is started (S41), a predetermined message is displayed on the display units 10-1 and 10-2 (S42), and thereafter, it is indicated that the full charge capacity can be estimated. -1 (S36), and when the fact that the full charge capacity estimation is completed is received from the full charge capacity estimation unit 91-1 (S37: Yes), the current power supply control is completed. For example, as the third power supply control, the power supply control unit 92-1 closes the switch 5-1 and supplies power according to the full charge capacity estimated current If from the power conversion unit 2-1 to the storage battery 3-1. Then, the switch 6-1 is opened so that electric power is not supplied from the storage battery 3-1 to the vehicle Ve-1. This makes it possible to prevent power from being supplied from the system power supply P to the storage battery 3-1 and from being supplied from the storage battery 3-1 to the vehicle Ve-1 during estimation of the full charge capacity of the storage battery 3-1. In addition, as the third power supply control, the power supply control unit 92-1 closes the switch 4-2, causes the power conversion unit 2-2 to supply power according to the required current I2 to the vehicle Ve-2, and performs the switch. 4-1 is closed so that the electric power output from the system power supply P does not exceed the threshold value (the current detected by the current detection unit D does not exceed the threshold value Ith), or zero or very small electric power is applied. -1 to the vehicle Ve-1. As a result, when the electric power output from the system power supply P has no margin and when the remaining capacity of the storage battery 3-2 also has no margin, at least the electric power supplied to the storage battery 3-1 is secured and the vehicle Ve is secured. It is possible to give priority to the power supply to -2. After starting the third power supply control, the power supply control unit 92-1 displays a message that the storage battery B-1 cannot be charged or a message that the completion of charging the storage battery B-1 is delayed on the display unit 10-. Display on 1.

  If there are three or more chargers 1 connected to the system power supply P, the earlier the vehicle Ve is connected to the charger 1, the higher the priority of power supply to the vehicle Ve becomes. You may comprise. Further, the earlier the charging completion time of the storage battery B set by the user is, the higher the priority of power supply to the vehicle Ve in which the storage battery B is mounted may be configured to be higher.

  Further, the power supply control unit 92-1 determines that the sum of the full charge capacity estimated current If, the required current I1, and the required current I2 is larger than the threshold value Ith (S34: No), and the storage battery 3-2 is charged. When the rate is smaller than the predetermined value (S38: No) and the priority of the power supply to the vehicle Ve-2 is not higher than the priority of the power supply to the vehicle Ve-1 (S40: No), the The power supply control of No. 4 is started (S43), a predetermined message is displayed on the display units 10-1 and 10-2 (S44), and then the full charge capacity estimation unit indicates that full charge capacity estimation is possible. 91-1 (S36), and when the fact that the full charge capacity estimation is completed is received from the full charge capacity estimation unit 91-1 (S37: Yes), the current power supply control is terminated. For example, as the fourth power supply control, the power supply control unit 92-1 closes the switch 5-1 and supplies power according to the full charge capacity estimated current If from the power conversion unit 2-1 to the storage battery 3-1. Then, the switch 6-1 is opened to prevent electric power from being supplied from the storage battery 3-1 to the vehicle Ve-1. This makes it possible to prevent power from being supplied from the system power supply P to the storage battery 3-1 and from being supplied from the storage battery 3-1 to the vehicle Ve-1 during estimation of the full charge capacity of the storage battery 3-1. In addition, the power supply control unit 92-1 closes the switch 4-1 and the switch 4-2 as the fourth power supply control so that the power output from the system power supply P does not exceed the threshold value Wth (current detection). Zero or very little electric power is supplied from the electric power conversion unit 2-1 to the vehicle Ve-1 and the electric power conversion unit 2-2 is supplied to the vehicle Ve-2 so that the current detected by the part D does not exceed the threshold value Ith. Let After starting the fourth power supply control, the power supply control unit 92-1 delays the message that the storage batteries B-1 and B-2 cannot be charged or the completion of charging the storage batteries B-1 and B-2. A message to that effect is displayed on the display units 10-1 and 10-2.

  In addition, as the fourth power supply control, the power supply control unit 92-1 closes the switch 4-1 and causes the power conversion unit 2-1 to supply the power corresponding to the required current I1 to the vehicle Ve-1 to switch the switch. 4-2 is closed so that the electric power output from the system power supply P does not exceed the threshold value (the current detected by the current detection unit D does not exceed the threshold value Ith). -2 may supply to the vehicle Ve-2. In the case of such a configuration, the power supply control unit 92-1 causes the display unit 10-2 to display a message to the effect that the completion of charging the storage battery B-2 will be delayed.

  The power supply control unit 92-1 determines the full charge capacity estimated power Wf, which is the value obtained by multiplying the full charge capacity estimated current If by the constant voltage Vc, and the required power, which is the value obtained by multiplying the required current I1 by the constant voltage Vc. When the sum of W1 and the required power W2, which is the value obtained by multiplying the required current I2 by the constant voltage Vc, is equal to or less than the threshold value Wth (S34: Yes), the process proceeds to S35, and the full charge capacity estimated power Wf and the required power W1 are obtained. When the total of the required power W2 and the required power W2 is larger than the threshold value Wth (S34: No), the process may proceed to S38.

  As described above, in the charger 1-1 of the above-described embodiment, when the electric power is supplied from the system power source P to the storage battery 3-1 in order to estimate the full charge capacity of the storage battery 3-1, the vehicle Ve-1 is Even when connected to the charger 1-1, the storage battery 3-1 does not supply electric power to the vehicle Ve-1. As a result, the integrated current amount of the storage battery 3-1 during the estimation of the full charge capacity is larger than that in the case where the electric power is supplied from the storage battery 3-1 to the vehicle Ve-1 during the estimation of the full charge capacity of the storage battery 3-1. Therefore, the accuracy of estimating the full charge capacity can be improved.

  Further, in the charger 1-1 of the above-described embodiment, the full charge capacity estimated current If flowing in the storage battery 3-1 during the estimation of the full charge capacity of the storage battery 3-1, the required current I1 of the vehicle Ve-1, and the vehicle Ve. -2 when the sum of the required current I2 and the required current I2 is larger than the threshold value Ith, and when the charging rate of the storage battery 3-2 is equal to or more than a predetermined value, the storage battery 3-2 supplies power to the vehicle Ve-2. ing. Thus, when there is no margin in the electric power output from the system power supply P, the electric power output from the storage battery 3-2 compensates for the electric power that is insufficient by giving priority to the electric power supply to the storage battery 3-1. Therefore, it is possible not to reduce the integrated current amount of the storage battery 3-1 during the estimation of the full charge capacity, and it is possible to maintain the accuracy of the estimation of the full charge capacity of the storage battery 3-1.

  Further, in the charger 1-1 of the above-described embodiment, the full charge capacity estimated current If flowing in the storage battery 3-1 during the estimation of the full charge capacity of the storage battery 3-1, the required current I1 of the vehicle Ve-1, and the vehicle Ve. -2 is greater than the required current I2 of the threshold value Ith, and the charging rate of the storage battery 3-2 is smaller than a predetermined value, and the priority of the power supply to the vehicle Ve-2 is. When the priority of the power supply to the vehicle Ve-1 is higher, the power supply from the grid power supply P to the storage battery 3-1 is given priority over the power supply from the grid power supply P to the vehicle Ve-1, and the grid power supply P is also given. Is supplying power to the vehicle Ve-2. This makes it possible to secure at least the electric power supplied to the storage battery 3-1 when the electric power output from the system power supply P has no margin and when the remaining capacity of the storage battery 3-2 also has no margin. It is possible not to reduce the integrated current amount of the storage battery 3-1 during the full charge capacity estimation, and it is possible to maintain the accuracy of the full charge capacity estimation of the storage battery 3-1.

  Further, the present invention is not limited to the above embodiment, and various improvements and changes can be made without departing from the gist of the present invention.

1-1, 1-2 Charger 2-1, 2-2 Power conversion unit 3-1, 3-2 Storage battery 4-1, 4-2 Switch 5-1, 5-2 Switch 6-1, 6-2 Switches 7-1 and 7-2 Current detection units 8-1 and 8-2 Charging rate estimation units 9-1 and 9-2 Control units 10-1 and 10-2 Display units 91-1 and 91-2 Full charge capacity Estimating units 92-1 and 92-2 Power supply control unit

Claims (3)

A charger for supplying electric power to the first vehicle,
A first storage battery,
The difference between the charging rate of the storage battery at the end of charging and the charging rate of the storage battery at the start of charging, the full charge capacity for estimating the full charge capacity of the storage battery by dividing the integrated current amount of the storage battery being charged. An estimation section,
The power supply from the grid power supply to the vehicle, the power supply from the grid power supply to the first storage battery, and the first storage battery to the first storage battery so that the power output from the grid power supply does not exceed a threshold value. A power supply control unit for controlling power supply to the vehicle,
Equipped with
The power supply control unit determines whether or not to estimate the full charge capacity of the first storage battery, and only when it is determined to estimate the full charge capacity of the first storage battery, the full charge of the first storage battery is determined. When electric power is being supplied from the system power supply to the first storage battery in order to estimate the charge capacity, even if the first vehicle is connected to the charger, the first storage battery may be connected to the first vehicle. To the first storage battery for estimating the full charge capacity of the first storage battery without supplying power to the first storage battery . The charger according to claim 1, wherein
The power supply control unit, a full charge capacity estimation current flowing through the first storage battery during full charge capacity estimation of the first storage battery, a first required current required from the first vehicle, When the sum of the second demand current required from the second vehicle connected to the charger other than the charger is larger than the threshold, and the second charger provided in the other charger. A charger, wherein power is supplied from the second storage battery to the second vehicle when the charging rate of the storage battery is equal to or higher than a predetermined value. The charger according to claim 1, wherein
The power supply control unit, a full charge capacity estimation current flowing through the first storage battery during full charge capacity estimation of the first storage battery, a first required current requested from the first vehicle, When the sum of the second demand current required from the second vehicle connected to the charger other than the charger is larger than the threshold, and the second charger provided in the other charger. When the charging rate of the storage battery is smaller than a predetermined value, and when the priority of the power supply to the second vehicle is higher than the priority of the power supply to the first vehicle, the system power supply is used to A charger that prioritizes power supply from the system power supply to the first storage battery over power supply to the first vehicle, and that also supplies power from the system power supply to the second vehicle. .

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