JP6686761B2 - 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 ensure that the power output from the grid power supply does not exceed the contracted power, it is installed in a vehicle using not only the power output from the grid power supply but also the power output from the storage battery. There is one that charges the storage battery. Related techniques include, for example, Patent Documents 1 and 2.

  In the charger configured as described above, it is desirable to know the life and the charging rate of the storage battery included in the charger so that the power output from the system power supply does not exceed the contracted power.

As a method of grasping the life and charge rate of the storage battery, there is a method of using the full charge capacity of the storage battery, for example.
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 (integrated current amount) obtained by integrating the current flowing through the storage battery being charged. As a related technique, there is Patent Document 3, for example.

  Further, as a method of improving 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 4, for example.

JP, 2014-138534, A JP, 2014-033554, A JP, 2014-119265, A JP, 2005-202010, A

  However, as described above, in the charger equipped with the storage battery, the charging rate of the storage battery is as high as possible so that the power of the storage battery can be used when the power output from the grid power source is about to exceed the contracted power. However, if the charging rate of the storage battery is high, it is difficult to increase the cumulative current amount of the storage battery when estimating the full charge capacity.Therefore, increase the estimation accuracy of the full charge capacity. There is a concern that you cannot do it.

  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 embodiment of the present invention, is a charger that supplies electric power to a vehicle, and is a difference between a storage battery, a charging rate of the storage battery at the end of charging, and a charging rate of the storage battery at the start of charging, A full-charge capacity estimation unit that estimates the full-charge capacity of the storage battery by dividing the integrated current amount of the storage battery that is being charged, and the power from the system power supply to the vehicle so that the power output from the system power supply does not exceed the threshold value. And a power supply control unit for controlling power supply, power supply from the system power supply to the storage battery, and power supply from the storage battery to the vehicle.

  Further, the power supply controller controls the storage battery rather than the power supply from the system power supply to the vehicle when a predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery and the charging rate of the storage battery is equal to or more than the first predetermined value. Prioritize power supply to the 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 figure which shows an example of an OCV-SOC characteristic curve, an advance preparation period, and a full charge capacity estimation period. 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 a power supply control part. It is a flow chart which shows other examples 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 shown in FIG. 1 charges a storage battery B mounted on the vehicle Ve by supplying electric power to a vehicle Ve such as an electric forklift truck or an electric vehicle via a charging cable Ca, for example.

Further, the charger 1 includes a power conversion unit 2, a storage battery 3, switches 4 to 6, current detection units 7 and 8, a charging rate estimation unit 9, and a control unit 10.
The power conversion unit 2 includes, for example, an AC / DC converter, converts the electric power output from the system power supply P from AC to DC and supplies the electric power to the vehicle Ve, so that the storage battery B mounted on the vehicle Ve is converted. Charge it. In addition, the power conversion unit 2 charges the storage battery 3 by supplying power to the storage battery 3.

  The storage battery 3 is composed of, for example, one or more lithium-ion batteries, a nickel-hydrogen battery, or an electric double layer capacitor, and is charged by the power output from the system power supply P being supplied via the power conversion unit 2. To be done. Further, the storage battery 3 charges the storage battery B mounted on the vehicle Ve by supplying electric power to the vehicle Ve.

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

  Each of the current detectors 7 and 8 is composed of, for example, a Hall element or a shunt resistor. The current detector 7 detects the current output from the system power supply P. The current detector 8 detects the current flowing through the storage battery 3. When there are a plurality of chargers 1 and power is output from the system power supply P to each of the chargers 1, the current detection unit 7 calculates the total current output from the system power supply P to each of the chargers 1. Shall be detected.

  The charging rate estimation unit 9 is configured by, for example, a CPU (Central Processing Unit), a multi-core CPU, or a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), or the like). The charging rate estimation unit 9 detects the voltage of the storage battery 3. In addition, the charging rate estimation unit 9 obtains the integrated current amount [Ah] of the storage battery 3 by integrating the current detected by the current detection unit 8 during the charging of the storage battery 3. In addition, the charging rate estimation unit 9 estimates the charging rate of the storage battery 3. For example, the charging rate estimating unit 9 stores information (for example, information stored in a storage unit (not shown)) indicating a correspondence relationship between the open circuit voltage OCV (Open Closed Voltage) of the storage battery 3 and the charging rate SOC (State Of Charge). , (OCV-SOC characteristic curve shown in FIG. 2A), the charging rate SOC of the storage battery 3 corresponding to the current open circuit voltage OCV of the storage battery 3 is obtained, and the obtained charging rate SOC of the storage battery 3 is obtained. Use the current charging rate. The charging rate estimating unit 9 may use the voltage of the storage battery 3 when the switch 5 is open as the current open circuit voltage OCV of the storage battery 3, or the closed circuit of the storage battery 3 when the switch 5 is closed. The current open circuit voltage OCV of the storage battery 3 may be calculated using the voltage and the correction value. In addition, the charging rate estimation unit 9 adds the value obtained by dividing the integrated current amount [Ah] of the storage battery 3 being charged by the full charge capacity [Ah] of the storage battery 3 to the charging rate of the storage battery 3 before the start of charging. Alternatively, the charging rate of the storage battery 3 during charging may be obtained.

  The control unit 10 is configured by, for example, a CPU, a multi-core CPU, or a programmable device, and includes a full charge capacity estimation unit 101 and a power supply control unit 102. The control unit 10 may be provided with the charging rate estimation unit 9. For example, the CPU, the multi-core CPU, or the programmable device executes a predetermined program to implement the charging rate estimation unit 9, the full charge capacity estimation unit 101, and the power supply control unit 102.

The full charge capacity estimation unit 101 estimates the full charge capacity of the storage battery 3.
The power supply control unit 102 determines the power output from the system power supply P based on the current detected by the current detection unit 7. Further, the power supply control unit 102 controls the operations of the power conversion unit 2 and the switches 4 to 6 so that the power output from the system power supply P does not exceed the threshold value Wth (for example, contract power). The power supply from the system power supply P to the vehicle Ve, the power supply from the system power supply P to the storage battery 3, and the power supply from the storage battery 3 to the vehicle Ve are controlled. The power supply control unit 102 controls the operations of the power conversion unit 2 and the switches 4 to 6 so that the current detected by the current detection unit 7 is a threshold value Ith (for example, the contract power is divided by a constant voltage). The power supply from the system power supply P to the vehicle Ve, the power supply from the system power supply P to the storage battery 3, and the power supply from the storage battery 3 to the vehicle Ve are controlled so as not to exceed the value). Good.

FIG. 3 is a flowchart showing an example of the operation of the full charge capacity estimation unit 101.
First, when the full charge capacity estimation unit 101 receives from the power supply control unit 102 that the full charge capacity estimation is possible (S31: Yes), the fact that the full charge capacity estimation is started is indicated by the charging rate estimation unit 9 and the power consumption. It is sent to the supply control unit 102 (S32). When the charging rate estimating unit 9 receives the notification that the full charge capacity estimation is started, the charging rate estimating unit 9 waits for a certain period of time until the storage battery 3 is in a fully charged state (for example, until the charging rate of the storage battery 3 reaches 100%). First, the charging rate and the accumulated current amount of the storage battery 3 are sent to the full charge capacity estimation unit 101.

  Next, the full charge capacity estimation unit 101 receives the charge rate and the integrated current amount of the storage battery 3 from the charge rate estimation unit 9 until the storage battery 3 is fully charged (S33, S34: No). For example, the full-charge-capacity estimating unit 101 sends the fact that the full-charge-capacity estimation is started to the charge-rate estimating unit 9, and then the charge-rate estimating unit 9 sends the charge-rate estimated first to the full-charge-capacity estimating start The charging rate of the storage battery 3 at the time (when charging is started) is stored in a storage unit (not shown). Further, the full charge capacity estimation unit 101 sends the fact that the full charge capacity estimation is started to the charge rate estimation unit 9, and then the charge rate last sent from the charge rate estimation unit 9 is calculated as the full charge capacity estimation end. At the time of charging (when charging is completed), the charging rate of the storage battery 3 is stored in a storage unit (not shown), and the integrated current amount finally sent from the charging rate estimating unit 9 is calculated during full charge capacity estimation (during charging). The integrated current amount of the storage battery 3 is stored in a storage unit (not shown). Further, when the charging rate of the storage battery 3 sent from the charging rate estimating unit 9 reaches 100 [%], the full charge capacity estimating unit 101 determines that the storage battery 3 is in a fully charged state.

  Next, when the storage battery 3 is in a fully charged state (S34: Yes), the full charge capacity estimation unit 101 determines the charging rate of the storage battery 3 at the end of full charge capacity estimation (at the end of charging) and the start of full charge capacity estimation ( The result obtained by dividing the integrated current amount of the storage battery 3 during full-charge capacity estimation (during charging) by the difference between the charging rate of the storage battery 3 (at the start of charging) and the full-charge capacity of the storage battery 3 is calculated as The charge capacity is estimated (S35).

Then, the full charge capacity estimation unit 101 sends the fact that the full charge capacity estimation is completed to the power supply control unit 102 (S36).
FIG. 4 is a flowchart showing an example of the operation of the power supply control unit 102.

First, when the predetermined time has not elapsed since the previous estimation of the full charge capacity (S41: No), the power supply control unit 102 performs normal power supply control (S42).
For example, when the predetermined time (for example, 30 days or 720 hours) has not elapsed since the previous estimation of the full charge capacity, the power supply control unit 102 issues another instruction to start power supply to the vehicle Ve, which is not illustrated. When the power is received from the power source, the switch 6 is opened to prevent the storage battery 3 from supplying electric power to the vehicle Ve, and the switch 4 is closed so that the electric power output from the system power supply P does not exceed the threshold value Wth. Power is supplied from the unit 2 to the vehicle Ve. In this state, when the power output from the system power supply P has no margin (for example, when the difference between the power output from the system power supply P and the threshold value Wth is within the predetermined power value W1), the power supply control unit 102 , The switches 4 and 6 are both closed so that the electric power output from the system power supply P does not exceed the threshold value Wth so that the electric power is supplied from the electric power conversion unit 2 to the vehicle Ve and the electric power is supplied from the storage battery 3 to the vehicle Ve. . That is, the power supply control unit 102 performs normal power supply control so that the power output from the system power supply P does not exceed the threshold value Wth, rather than the power supply from the storage battery 3 to the vehicle Ve from the system power supply P to the vehicle Ve. Prioritize power supply to It should be noted that the power supply control unit 102 performs normal power supply control when the power output from the grid power supply P has a margin (for example, the difference between the power output from the grid power supply P and the threshold value Wth is a predetermined power value). When the predetermined power value W2 is larger than W1), the switch 5 is closed, and the storage battery 3 is charged by supplying power from the power conversion unit 2 to the storage battery 3, so that the power output from the system power supply P has no margin. At this time (for example, when the difference between the power output from the system power supply P and the threshold value Wth is within the predetermined power value W1), the switch 5 is opened and the power is not supplied from the system power supply P to the storage battery 3. Good.

  In addition, the power supply control unit 102 determines that the charging rate of the storage battery 3 is smaller than the first predetermined value (S43: No) when a predetermined time has elapsed since the previous estimation of the full charge capacity (S41: Yes), and If the power output from the system power supply P has a margin (S46: Yes), the fact that full charge capacity estimation is possible is sent to the full charge capacity estimation unit 101 (S47) to indicate that full charge capacity estimation has started. When receiving from the full charge capacity estimation unit 101 (S48: Yes), the power supply control for full charge capacity estimation is performed until the full charge capacity estimation unit 101 receives the fact that the full charge capacity estimation is completed (S49, S50: No). ). For example, it is assumed that the first predetermined value is set to an arbitrary value of the charging rate SOC of the portion A where the slope of the OCV-SOC characteristic curve shown in FIG. 2A is large. A portion A having a large inclination of the OCV-SOC characteristic curve has a smaller influence of erroneous detection of the open circuit voltage OCV of the storage battery 3 than a portion B having a small inclination of the OCV-SOC characteristic curve. Therefore, by using the charging rate SOC of the portion A having a large slope of the OCV-SOC characteristic curve as the first predetermined value, the charging rate SOC of the storage battery 3 can be accurately obtained from the open circuit voltage OCV of the storage battery 3, The reliability of the comparison result of whether the charging rate of the storage battery 3 is smaller than the first predetermined value can be improved. Further, for example, when the difference between the power output from the system power supply P and the threshold value Wth is the predetermined power value W2 or more, the power supply control unit 102 determines that the power output from the system power supply P has a margin.

  In addition, when a predetermined time has passed since the previous estimation of the full charge capacity (S41: Yes), the power supply control unit 102 determines that the charging rate of the storage battery 3 is equal to or higher than the first predetermined value (S43: Yes), the storage battery. The power supply control for advance preparation is performed until the charging rate of 3 becomes smaller than the first predetermined value (S44, S45: No). For example, the power supply control unit 102 receives the power supply start instruction to the vehicle Ve from another control unit (not shown) or the like while performing power supply control for advance preparation (advance preparation period), and then switches 4 The switch 6 is closed so that power is not supplied from the power conversion unit 2 to the vehicle Ve by opening the switch 6, and power is supplied from the storage battery 3 to the vehicle Ve. In this state, if the electric power supplied to the vehicle Ve is insufficient, the electric power supply control unit 102 closes both the switches 4 and 6 to supply electric power from the storage battery 3 to the vehicle Ve and outputs the electric power from the system power supply P. The electric power is supplied from the electric power conversion unit 2 to the vehicle Ve so that the generated electric power does not exceed the threshold value Wth. Further, the power supply control unit 102 opens the switch 5 and prohibits power supply from the power conversion unit 2 to the storage battery 3 while performing power supply control for advance preparation. In this state, when the storage battery 3 is about to be over-discharged, the power supply control unit 102 closes the switch 5 and causes the power conversion unit 2 to supply power to the storage battery 3. That is, the power supply control unit 102 prioritizes the power supply from the storage battery 3 to the vehicle Ve over the power supply from the system power supply P to the vehicle Ve while performing the power supply control for advance preparation, and the system power supply P From power supply to the storage battery 3 from.

  Next, after the charging rate of the storage battery 3 becomes smaller than the first predetermined value (S45: Yes), the power supply control unit 102 determines that the power output from the system power supply P has a margin (S46: Yes). ), The fact that the full charge capacity can be estimated is sent to the full charge capacity estimating unit 101 (S47), and the fact that the full charge capacity estimation is started is received from the full charge capacity estimating unit 101 (S48: Yes). Power supply control for full charge capacity estimation is performed until the capacity estimation is received from the full charge capacity estimation unit 101 (S49, S50: No). For example, the power supply control unit 102 closes the switch 5 and causes the power conversion unit 2 to supply power to the storage battery 3 while performing power supply control for full charge capacity estimation (full charge capacity estimation period). In addition, when the power supply control unit 102 receives a power supply start instruction to the vehicle Ve from another control unit (not shown) or the like while performing power supply control for full charge capacity estimation, the power supply control unit 102 causes the switches 4 and 5 to operate. Both are closed, and power is supplied from the power conversion unit 2 to the storage battery 3 and the vehicle Ve so that the power output from the system power supply P does not exceed the threshold value Wth. In this state, when the electric power supplied to the vehicle Ve is insufficient, the electric power supply control unit 102 further closes the switch 6 so that the electric power output from the system power supply P does not exceed the threshold value Wth. Electric power is supplied from the unit 2 to the storage battery 3 and the vehicle Ve, respectively, and electric power is supplied from the storage battery 3 to the vehicle Ve. That is, the power supply control unit 102 supplies power to the storage battery 3 from the system power supply P and refrains from supplying power from the storage battery 3 to the vehicle Ve while performing power supply control for estimating the full charge capacity.

  For example, as shown in FIG. 2B, when a predetermined time (t11 to t12) has elapsed from the previous estimation of the full charge capacity and the charging rate of the storage battery 3 is equal to or higher than the first predetermined value, the power is supplied. The control unit 102 performs power supply control for advance preparation until the charging rate of the storage battery 3 becomes smaller than the first predetermined value (t12 to t13).

  After that, when the power supply control unit 102 determines that the power output from the system power supply P has a margin, it sends the fact that full charge capacity estimation is possible to the full charge capacity estimation unit 101 and starts full charge capacity estimation. The power supply control for full charge capacity estimation is performed until the fact that the full charge capacity estimation is completed is received after receiving the message (t14 to t15).

As described above, in the charger 1 of the above-described embodiment, when the predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery 3 and the charging rate of the storage battery 3 is equal to or higher than the first predetermined value, the system power supply P The power supply from the storage battery 3 to the vehicle Ve is prioritized over the power supply to the vehicle Ve. As a result, the charging rate of the storage battery 3 can be intentionally reduced in the preliminary preparation period before the full charge capacity estimation period, and the integrated current amount of the storage battery 3 is increased by that amount in the full charge capacity estimation period. be able to. Therefore, it is possible to accurately estimate the full charge capacity of the storage battery 3 having a high charging rate so that the vehicle Ve can be supplied with power when the power output from the system power supply P is about to exceed the threshold value Wth. You can
Further, in the charger 1 of the above-described embodiment, when the predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery 3 and the charging rate of the storage battery 3 is equal to or higher than the first predetermined value, the storage battery 3 is switched from the system power supply P. Refraining from power supply to As a result, the charging rate of the storage battery 3 can be further reduced in the preparatory period before the full charge capacity estimation period, and accordingly, the integrated current amount of the storage battery 3 can be further increased in the full charge capacity estimation period. Therefore, the accuracy of estimating the full charge capacity of the storage battery 3 can be improved.

  Further, in the charger 1 of the above-described embodiment, when the storage battery 3 is being charged in order to estimate the full charge capacity of the storage battery 3, the power supply from the storage battery 3 to the vehicle Ve is withheld. This makes it possible to further increase the integrated current amount of the storage battery 3 during the full charge capacity estimation period, so that the accuracy of estimating the full charge capacity of the storage battery 3 can be further improved.

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.
FIG. 5 is a flowchart showing another example of the operation of the power supply control unit 102. In the flowchart shown in FIG. 5, description of the same processing as that in the flowchart shown in FIG. 4 will be omitted.

  Although the power supply control unit 102 has passed a predetermined time since the previous full charge capacity estimation (S41: Yes) and the charging rate of the storage battery 3 is equal to or higher than the first predetermined value (S43: Yes), When it is in the time zone (S43a: No), normal power supply control is performed (S42). The predetermined time period is a time period in which the charging rate of the storage battery 3 is required to be equal to or greater than a second predetermined value (for example, a second predetermined value shown in FIG. 2A) that is larger than the first predetermined value. Thus, for example, it is a time period during which power is frequently supplied from the charger 1 to the vehicle Ve.

  In addition, in the flowchart shown in FIG. 5, the power supply control unit 102 determines that the predetermined time has elapsed since the previous estimation of the full charge capacity (S41: Yes), and the charging rate of the storage battery 3 is equal to or higher than the first predetermined value. When (S43: Yes) and other than the predetermined time zone (S43a: Yes), the power supply control for advance preparation is performed until the charging rate of the storage battery 3 becomes smaller than the first predetermined value (S44). , S45: No).

  For example, as shown in FIG. 2C, when a predetermined time (t21 to t22) has elapsed since the previous full charge capacity estimation, the charging rate of the storage battery 3 is equal to or greater than the first predetermined value, but the predetermined time In the band, the power supply control unit 102 performs normal power supply control.

  After that, when the charging rate of the storage battery 3 becomes equal to or higher than the first predetermined value and is outside the predetermined time period, the power supply control unit 102 continues until the charging rate of the storage battery 3 becomes smaller than the first predetermined value. Power supply control for advance preparation is performed (t23 to t24).

  Then, after the preliminary preparation period, when the power supply control unit 102 determines that the power output from the system power supply P has a margin, it sends the fact that full charge capacity estimation is possible to the full charge capacity estimation unit 101, and The power supply control for full charge capacity estimation is performed from the reception of the start of the charge capacity estimation to the reception of the completion of the full charge capacity estimation (t25 to t26).

  As described above, in the flowchart shown in FIG. 5, when the predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery 3 and the charging rate of the storage battery 3 is equal to or higher than the first predetermined value, and in the predetermined time zone. Otherwise, the power supply from the storage battery 3 to the vehicle Ve is prioritized over the power supply from the system power supply P to the vehicle Ve, and the power supply from the system power supply P to the storage battery 3 is withheld.

  As a result, similarly to the above-described embodiment, the charging rate of the storage battery 3 can be intentionally reduced in the preparation period before the full charge capacity estimation period, and the storage battery 3 can be correspondingly reduced in the full charge capacity estimation period. The integrated current amount of can be increased. Therefore, it is possible to accurately estimate the full charge capacity of the storage battery 3 having a high charging rate so that the vehicle Ve can be supplied with power when the power output from the system power supply P is about to exceed the threshold value Wth. You can

  Further, in the flowchart shown in FIG. 5, the charging rate of the storage battery 3 is equal to or more than the first predetermined value when a predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery 3, but in the case of the predetermined time zone, In order that the power output from the power supply P does not exceed the threshold value Wth, the power supply from the system power supply P to the vehicle Ve is prioritized over the power supply from the storage battery 3 to the vehicle Ve.

  As a result, it is possible to prevent the charging rate of the storage battery 3 from decreasing in a time period when power is frequently supplied from the charger 1 to the vehicle Ve, so that the power output from the system power supply P is equal to the threshold value Wth. It is possible to supply the desired electric power to the vehicle Ve while not exceeding the above.

1 Charger 2 Power conversion unit 3 Storage battery 4-6 Switches 7, 8 Current detection unit 9 Charging rate estimation unit 10 Control unit 101 Full charge capacity estimation unit 102 Power supply control unit P System power supply Ve Vehicle B Storage battery Ca Charging cable

Claims (5)

A charger for supplying electric power to a vehicle,
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 storage battery, and the power supply from the storage battery to the vehicle are controlled so that the power output from the grid power supply does not exceed a threshold value. A power supply control unit,
Equipped with
When the predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery and the charging rate of the storage battery is equal to or more than a first predetermined value, the power supply control unit supplies power to the vehicle from the system power supply. Also, a charger characterized by giving priority to power supply from the storage battery to the vehicle. The charger according to claim 1, wherein
The power supply control unit, when the predetermined time has elapsed from the previous full charge capacity estimation of the storage battery, and the charging rate of the storage battery is equal to or more than the first predetermined value, the power from the system power supply to the storage battery. Charger characterized by refraining from supply. The charger according to claim 1, wherein
The power supply control unit, the predetermined time has elapsed from the previous full charge capacity estimation of the storage battery, and when the charging rate of the storage battery is equal to or more than the first predetermined value, and the charging rate of the storage battery is During a period other than a predetermined time period required for a second predetermined value greater than the first predetermined value, the power supply from the storage battery to the vehicle has priority over the power supply from the system power supply to the vehicle. A charger characterized by: The charger according to claim 3, wherein
The power supply control unit, when the predetermined time has elapsed from the previous estimation of the full charge capacity of the storage battery, and the charging rate of the storage battery is equal to or more than the first predetermined value, and other than the predetermined time period. At this time, the charger that refrains from supplying power from the system power supply to the storage battery. The charger according to any one of claims 1 to 4,
The charger, wherein the power supply control unit refrains from supplying power to the vehicle from the storage battery while charging the storage battery in order to estimate the full charge capacity of the storage battery.

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