JP6686761B2 - Charger - Google Patents

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JP6686761B2
JP6686761B2 JP2016143949A JP2016143949A JP6686761B2 JP 6686761 B2 JP6686761 B2 JP 6686761B2 JP 2016143949 A JP2016143949 A JP 2016143949A JP 2016143949 A JP2016143949 A JP 2016143949A JP 6686761 B2 JP6686761 B2 JP 6686761B2
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storage battery
power supply
charge capacity
full charge
vehicle
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JP2018014849A (en
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皓子 安谷屋
皓子 安谷屋
順一 波多野
順一 波多野
祐希 村松
祐希 村松
隆広 都竹
隆広 都竹
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Toyota Industries Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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  • Tests Of Electric Status Of Batteries (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Description

本発明は、畜電池を備える充電器に関する。   The present invention relates to a charger including a storage battery.

蓄電池を備える充電器として、例えば、系統電源から出力される電力が契約電力を超えないように、系統電源から出力される電力だけでなく蓄電池から出力される電力も使用して、車両に搭載される蓄電池を充電するものがある。関連する技術として、例えば、特許文献１、２がある。   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.

このように構成される充電器では、系統電源から出力される電力が契約電力を超えないようにするために、充電器に備えられる蓄電池の寿命や充電率を把握しておくことが望ましい。   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.

蓄電池の寿命や充電率を把握する方法として、例えば、蓄電池の満充電容量を用いる方法がある。
しかしながら、蓄電池の満充電容量は、蓄電池の経年劣化に伴って低下していくため、定期的に推定する必要がある。 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.

蓄電池の満充電容量を推定する方法として、例えば、充電中の蓄電池に流れる電流を積算した値（積算電流量）を用いる方法がある。関連する技術として、例えば、特許文献３がある。   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.

また、蓄電池の満充電容量の推定精度を上げる方法として、例えば、充電中の蓄電池の積算電流量を大きくすることで、蓄電池に流れる電流を検出する電流検出部の検出誤差の影響を小さくする方法がある。関連する技術として、例えば、特許文献４がある。   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.

特開２０１４−１３８５３４号公報JP, 2014-138534, A 特開２０１４−０３３５５４号公報JP, 2014-033554, A 特開２０１４−１１９２６５号公報JP, 2014-119265, A 特開２０１５−２０２０１０号公報JP, 2005-202010, A

しかしながら、上述のように、蓄電池を備える充電器では、系統電源から出力される電力が契約電力を超えそうになったときに、蓄電池の電力が使用できるように、蓄電池の充電率ができるだけ高くなっていることが望ましいが、このように蓄電池の充電率が高くなっていると、満充電容量推定時の蓄電池の積算電流量を大きくすることが難しくなるため、満充電容量の推定精度を上げることができないという懸念がある。   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.

本発明の一側面に係る目的は、充電器に備えられる蓄電池の満充電容量を精度良く推定することである。   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.

本発明に係る一つの形態である充電器は、車両へ電力を供給する充電器であって、蓄電池と、充電終了時の蓄電池の充電率と充電開始時の蓄電池の充電率との差分で、充電中の蓄電池の積算電流量を除算することにより蓄電池の満充電容量を推定する満充電容量推定部と、系統電源から出力される電力が閾値を超えないように、系統電源から車両への電力供給、系統電源から蓄電池への電力供給、及び蓄電池から車両への電力供給を制御する電力供給制御部とを備える。   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.

また、電力供給制御部は、蓄電池の前回の満充電容量推定から所定時間経過し、かつ、蓄電池の充電率が第１の所定値以上のときに、系統電源から車両への電力供給よりも蓄電池から車両への電力供給を優先する。   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.

本発明によれば、充電器に備えられる蓄電池の満充電容量を精度良く推定することができる。   According to the present invention, it is possible to accurately estimate the full charge capacity of a storage battery included in a charger.

実施形態の充電器の一例を示す図である。It is a figure which shows an example of the charger of embodiment. ＯＣＶ−ＳＯＣ特性曲線、事前準備期間、及び満充電容量推定期間の一例を示す図である。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. 満充電容量推定部の動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of a full charge capacity estimation part. 電力供給制御部の動作の一例を示すフローチャートである。It is a flow chart which shows an example of operation of a power supply control part. 電力供給制御部の動作の他の例を示すフローチャートである。It is a flow chart which shows other examples of operation of an electric power supply control part.

以下図面に基づいて実施形態について詳細を説明する。
図１は、実施形態の充電器の一例を示す図である。
図１に示す充電器１は、例えば、電動フォークリフトや電気自動車などの車両Ｖｅに充電ケーブルＣａを介して電力を供給することで、その車両Ｖｅに搭載される蓄電池Ｂを充電させる。 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.

また、充電器１は、電力変換部２と、蓄電池３と、スイッチ４〜６と、電流検出部７、８と、充電率推定部９と、制御部１０とを備える。
電力変換部２は、例えば、ＡＣ／ＤＣコンバータにより構成され、系統電源Ｐから出力される電力を交流から直流に変換して車両Ｖｅに供給することで、その車両Ｖｅに搭載される蓄電池Ｂを充電させる。また、電力変換部２は、蓄電池３に電力を供給することで、その蓄電池３を充電させる。 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.

蓄電池３は、例えば、１つ以上のリチウムイオン電池、ニッケル水素電池、または、電気二重層コンデンサにより構成され、系統電源Ｐから出力される電力が電力変換部２を介して供給されることにより充電される。また、蓄電池３は、車両Ｖｅに電力を供給することで、その車両Ｖｅに搭載される蓄電池Ｂを充電させる。   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.

スイッチ４〜６は、例えば、ＭＯＳＦＥＴ（Metal Oxide Semiconductor Field Effect Transistor）などの半導体スイッチや電磁式リレーにより構成される。スイッチ４は、電力変換部２と充電ケーブルＣａとをつなぐ電力線Ｌ１に設けられ、スイッチ５は、電力変換部２と蓄電池３とをつなぐ電力線Ｌ２に設けられ、スイッチ６は、蓄電池３と充電ケーブルＣａとをつなぐ電力線Ｌ３に設けられている。スイッチ４が閉じているとき、電力変換部２から出力される電力が車両Ｖｅに供給され、スイッチ５が閉じているとき、電力変換部２から出力される電力が蓄電池３に供給され、スイッチ６が閉じているとき、蓄電池３から出力される電力が車両Ｖｅに供給される。   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.

電流検出部７、８は、それぞれ、例えば、ホール素子やシャント抵抗により構成される。電流検出部７は、系統電源Ｐから出力される電流を検出する。電流検出部８は、蓄電池３に流れる電流を検出する。なお、充電器１が複数存在し、系統電源Ｐから各充電器１にそれぞれ電力が出力される場合、電流検出部７は、系統電源Ｐから各充電器１にそれぞれ出力される電流の合計を検出するものとする。   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.

充電率推定部９は、例えば、ＣＰＵ（Central Processing Unit）、マルチコアＣＰＵ、またはプログラマブルディバイス（ＦＰＧＡ（Field Programmable Gate Array）やＰＬＤ（Programmable Logic Device）など）により構成される。充電率推定部９は、蓄電池３の電圧を検出する。また、充電率推定部９は、蓄電池３の充電中、電流検出部８により検出される電流を積算することにより、蓄電池３の積算電流量［Ａｈ］を求める。また、充電率推定部９は、蓄電池３の充電率を推定する。例えば、充電率推定部９は、不図示の記憶部に記憶されている、蓄電池３の開回路電圧ＯＣＶ（Ｏｐｅｎ Ｃｌｏｓｅｄ Ｖｏｌｔａｇｅ）と充電率ＳＯＣ（Ｓｔａｔｅ Ｏｆ Ｃｈａｒｇｅ）との対応関係を示す情報（例えば、図２（ａ）に示すＯＣＶ−ＳＯＣ特性曲線）を参照して、蓄電池３の現在の開回路電圧ＯＣＶに対応する蓄電池３の充電率ＳＯＣを求め、その求めた充電率ＳＯＣを蓄電池３の現在の充電率とする。なお、充電率推定部９は、スイッチ５が開いているときの蓄電池３の電圧を、蓄電池３の現在の開回路電圧ＯＣＶとしてもよいし、スイッチ５が閉じているときの蓄電池３の閉回路電圧と補正値とを用いて蓄電池３の現在の開回路電圧ＯＣＶを算出してもよい。また、充電率推定部９は、充電開始前の蓄電池３の充電率に、充電中の蓄電池３の積算電流量［Ａｈ］を蓄電池３の満充電容量［Ａｈ］で除算した値を加算して、充電中の蓄電池３の充電率を求めてもよい。   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.

制御部１０は、例えば、ＣＰＵ、マルチコアＣＰＵ、またはプログラマブルディバイスにより構成され、満充電容量推定部１０１と、電力供給制御部１０２とを備える。なお、制御部１０に充電率推定部９が備えられてもよい。例えば、ＣＰＵ、マルチコアＣＰＵ、またはプログラマブルディバイスが所定のプログラムを実行することによって、充電率推定部９、満充電容量推定部１０１、及び電力供給制御部１０２が実現される。   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.

満充電容量推定部１０１は、蓄電池３の満充電容量を推定する。
電力供給制御部１０２は、電流検出部７により検出される電流に基づいて、系統電源Ｐから出力される電力を求める。また、電力供給制御部１０２は、電力変換部２及びスイッチ４〜６のそれぞれの動作を制御することにより、系統電源Ｐから出力される電力が閾値Ｗｔｈ（例えば、契約電力）を超えないように、系統電源Ｐから車両Ｖｅへの電力供給、系統電源Ｐから蓄電池３への電力供給、及び蓄電池３から車両Ｖｅへの電力供給を制御する。なお、電力供給制御部１０２は、電力変換部２及びスイッチ４〜６のそれぞれの動作を制御することにより、電流検出部７により検出される電流が閾値Ｉｔｈ（例えば、契約電力を一定電圧で割った値）を超えないように、系統電源Ｐから車両Ｖｅへの電力供給、系統電源Ｐから蓄電池３への電力供給、及び蓄電池３から車両Ｖｅへの電力供給を制御するように構成してもよい。 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.

図３は、満充電容量推定部１０１の動作の一例を示すフローチャートである。
まず、満充電容量推定部１０１は、満充電容量推定が可能である旨を電力供給制御部１０２から受け取ると（Ｓ３１：Ｙｅｓ）、満充電容量推定を開始した旨を充電率推定部９及び電力供給制御部１０２に送る（Ｓ３２）。充電率推定部９は、満充電容量推定を開始した旨を受け取ると、蓄電池３が満充電状態になるまで（例えば、蓄電池３の充電率が１００［％］になるまで）、一定時間経過毎に、蓄電池３の充電率及び積算電流量を満充電容量推定部１０１に送る。 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.

次に、満充電容量推定部１０１は、蓄電池３が満充電状態になるまで、蓄電池３の充電率及び積算電流量を充電率推定部９から受け取る（Ｓ３３、Ｓ３４：Ｎｏ）。例えば、満充電容量推定部１０１は、満充電容量推定を開始した旨を充電率推定部９に送った後、充電率推定部９から最初に送られてきた充電率を、満充電容量推定開始時（充電開始時）の蓄電池３の充電率として不図示の記憶部に記憶させる。また、満充電容量推定部１０１は、満充電容量推定を開始した旨を充電率推定部９に送った後、充電率推定部９から最後に送られてきた充電率を、満充電容量推定終了時（充電終了時）の蓄電池３の充電率として不図示の記憶部に記憶させるとともに、充電率推定部９から最後に送られてきた積算電流量を、満充電容量推定中（充電中）の蓄電池３の積算電流量として不図示の記憶部に記憶させる。また、満充電容量推定部１０１は、充電率推定部９から送られてくる蓄電池３の充電率が１００［％］になると、蓄電池３が満充電状態になったと判断する。   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.

次に、満充電容量推定部１０１は、蓄電池３が満充電状態になると（Ｓ３４：Ｙｅｓ）、満充電容量推定終了時（充電終了時）の蓄電池３の充電率と満充電容量推定開始時（充電開始時）の蓄電池３の充電率との差分で満充電容量推定中（充電中）の蓄電池３の積算電流量を除算した結果を蓄電池３の満充電容量とすることにより、蓄電池３の満充電容量を推定する（Ｓ３５）。   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).

そして、満充電容量推定部１０１は、満充電容量推定が終了した旨を電力供給制御部１０２に送る（Ｓ３６）。
図４は、電力供給制御部１０２の動作の一例を示すフローチャートである。 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.

まず、電力供給制御部１０２は、前回の満充電容量推定から所定時間が経過していないとき（Ｓ４１：Ｎｏ）、通常の電力供給制御を行う（Ｓ４２）。
例えば、電力供給制御部１０２は、前回の満充電容量推定から所定時間（例えば、３０日または７２０時間）が経過していないとき、車両Ｖｅへの電力供給開始指示を不図示の他の制御部などから受け取ると、スイッチ６を開くことにより蓄電池３から車両Ｖｅへ電力を供給させないようにするとともに、スイッチ４を閉じ、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、電力変換部２から車両Ｖｅへ電力を供給させる。この状態において、系統電源Ｐから出力される電力に余裕がなくなると（例えば、系統電源Ｐから出力される電力と閾値Ｗｔｈとの差が所定電力値Ｗ１以内になると）、電力供給制御部１０２は、スイッチ４、６をともに閉じ、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、電力変換部２から車両Ｖｅへ電力を供給させるとともに、蓄電池３から車両Ｖｅへ電力を供給させる。すなわち、電力供給制御部１０２は、通常の電力供給制御として、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、蓄電池３から車両Ｖｅへの電力供給よりも系統電源Ｐから車両Ｖｅへの電力供給を優先する。なお、電力供給制御部１０２は、通常の電力供給制御において、系統電源Ｐから出力される電力に余裕があるとき（例えば、系統電源Ｐから出力される電力と閾値Ｗｔｈとの差が所定電力値Ｗ１よりも大きい所定電力値Ｗ２以上のとき）、スイッチ５を閉じ、電力変換部２から蓄電池３へ電力を供給させることにより蓄電池３を充電させ、系統電源Ｐから出力される電力に余裕がないとき（例えば、系統電源Ｐから出力される電力と閾値Ｗｔｈとの差が所定電力値Ｗ１以内のとき）、スイッチ５を開き、系統電源Ｐから蓄電池３へ電力が供給されないように構成してもよい。 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.

また、電力供給制御部１０２は、前回の満充電容量推定から所定時間が経過したとき（Ｓ４１：Ｙｅｓ）、蓄電池３の充電率が第１の所定値よりも小さく（Ｓ４３：Ｎｏ）、かつ、系統電源Ｐから出力される電力に余裕があると（Ｓ４６：Ｙｅｓ）、満充電容量推定が可能である旨を満充電容量推定部１０１に送り（Ｓ４７）、満充電容量推定を開始した旨を満充電容量推定部１０１から受け取ると（Ｓ４８：Ｙｅｓ）、満充電容量推定が終了した旨を満充電容量推定部１０１から受け取るまで満充電容量推定用の電力供給制御を行う（Ｓ４９、Ｓ５０：Ｎｏ）。例えば、第１の所定値は、図２（ａ）に示すＯＣＶ−ＳＯＣ特性曲線の傾きが大きい部分Ａの充電率ＳＯＣのうちの任意の値に設定されるものとする。ＯＣＶ−ＳＯＣ特性曲線の傾きが大きい部分Ａは、ＯＣＶ−ＳＯＣ特性曲線の傾きが小さい部分Ｂに比べて、蓄電池３の開回路電圧ＯＣＶの誤検出の影響が小さい。そのため、第１の所定値としてＯＣＶ−ＳＯＣ特性曲線の傾きが大きい部分Ａの充電率ＳＯＣを使うことにより、蓄電池３の開回路電圧ＯＣＶから蓄電池３の充電率ＳＯＣを精度良く求めることができ、蓄電池３の充電率が第１の所定値よりも小さいか否かの比較結果の信頼性を高めることができる。また、例えば、電力供給制御部１０２は、系統電源Ｐから出力される電力と閾値Ｗｔｈとの差が所定電力値Ｗ２以上のとき、系統電源Ｐから出力される電力に余裕があると判断する。   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.

また、電力供給制御部１０２は、前回の満充電容量推定から所定時間が経過したとき（Ｓ４１：Ｙｅｓ）、蓄電池３の充電率が第１の所定値以上であると（Ｓ４３：Ｙｅｓ）、蓄電池３の充電率が第１の所定値よりも小さくなるまで、事前準備用の電力供給制御を行う（Ｓ４４、Ｓ４５：Ｎｏ）。例えば、電力供給制御部１０２は、事前準備用の電力供給制御を行っているとき（事前準備期間）、車両Ｖｅへの電力供給開始指示を不図示の他の制御部などから受け取ると、スイッチ４を開くことにより電力変換部２から車両Ｖｅへ電力を供給させないようにするとともに、スイッチ６を閉じ、蓄電池３から車両Ｖｅへ電力を供給させる。この状態において、車両Ｖｅへ供給される電力が不足していると、電力供給制御部１０２は、スイッチ４、６をともに閉じ、蓄電池３から車両Ｖｅへ電力を供給させるとともに、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、電力変換部２から車両Ｖｅへ電力を供給させる。また、電力供給制御部１０２は、事前準備用の電力供給制御を行っているとき、スイッチ５を開き、電力変換部２から蓄電池３への電力供給を禁止する。この状態において、蓄電池３が過放電状態になりそうになると、電力供給制御部１０２は、スイッチ５を閉じ、電力変換部２から蓄電池３へ電力を供給させる。すなわち、電力供給制御部１０２は、事前準備用の電力供給制御を行っているとき、系統電源Ｐから車両Ｖｅへの電力供給よりも蓄電池３から車両Ｖｅへの電力供給を優先し、系統電源Ｐから蓄電池３への電力供給を控える。   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.

次に、電力供給制御部１０２は、蓄電池３の充電率が第１の所定値よりも小さくなった後（Ｓ４５：Ｙｅｓ）、系統電源Ｐから出力される電力に余裕があると（Ｓ４６：Ｙｅｓ）、満充電容量推定が可能である旨を満充電容量推定部１０１に送り（Ｓ４７）、満充電容量推定を開始した旨を満充電容量推定部１０１から受け取ると（Ｓ４８：Ｙｅｓ）、満充電容量推定が終了した旨を満充電容量推定部１０１から受け取るまで満充電容量推定用の電力供給制御を行う（Ｓ４９、Ｓ５０：Ｎｏ）。例えば、電力供給制御部１０２は、満充電容量推定用の電力供給制御を行っているとき（満充電容量推定期間）、スイッチ５を閉じ、電力変換部２から蓄電池３へ電力を供給させる。また、電力供給制御部１０２は、満充電容量推定用の電力供給制御を行っているとき、車両Ｖｅへの電力供給開始指示を不図示の他の制御部などから受け取ると、スイッチ４、５をともに閉じ、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、電力変換部２から蓄電池３及び車両Ｖｅへそれぞれ電力を供給させる。この状態において、車両Ｖｅへ供給される電力が不足していると、電力供給制御部１０２は、さらにスイッチ６を閉じ、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、電力変換部２から蓄電池３及び車両Ｖｅへそれぞれ電力を供給させるとともに、蓄電池３から車両Ｖｅへ電力を供給させる。すなわち、電力供給制御部１０２は、満充電容量推定用の電力供給制御を行っているとき、系統電源Ｐから蓄電池３へ電力を供給しつつ、蓄電池３から車両Ｖｅへの電力供給を控える。   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.

例えば、図２（ｂ）に示すように、前回の満充電容量推定から所定時間（ｔ１１〜ｔ１２）が経過し、かつ、蓄電池３の充電率が第１の所定値以上であると、電力供給制御部１０２は、蓄電池３の充電率が第１の所定値よりも小さくなるまで事前準備用の電力供給制御を行う（ｔ１２〜ｔ１３）。   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).

その後、電力供給制御部１０２は、系統電源Ｐから出力される電力に余裕があると判断すると、満充電容量推定が可能である旨を満充電容量推定部１０１に送り、満充電容量推定を開始した旨を受け取ってから満充電容量推定が終了した旨を受け取るまで満充電容量推定用の電力供給制御を行う（ｔ１４〜ｔ１５）。   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).

このように、上記実施形態の充電器１では、蓄電池３の前回の満充電容量推定から所定時間経過し、かつ、蓄電池３の充電率が第１の所定値以上のときに、系統電源Ｐから車両Ｖｅへの電力供給よりも蓄電池３から車両Ｖｅへの電力供給を優先している。これにより、満充電容量推定期間の前の事前準備期間において、蓄電池３の充電率を意図的に小さくすることができ、その分、満充電容量推定期間において、蓄電池３の積算電流量を大きくすることができる。そのため、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えそうになったとき車両Ｖｅに電力を供給できるように充電率が高くなっている蓄電池３に対して満充電容量を精度良く推定することができる。
また、上記実施形態の充電器１では、蓄電池３の前回の満充電容量推定から所定時間経過し、かつ、蓄電池３の充電率が第１の所定値以上のときに、系統電源Ｐから蓄電池３への電力供給を控えている。これにより、満充電容量推定期間の前の事前準備期間において、蓄電池３の充電率をさらに小さくすることができ、その分、満充電容量推定期間において、蓄電池３の積算電流量をさらに大きくすることができるため、蓄電池３の満充電容量推定精度を向上させることができる。 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.

また、上記実施形態の充電器１では、蓄電池３の満充電容量を推定するために蓄電池３を充電しているとき、蓄電池３から車両Ｖｅへの電力供給を控えている。これにより、満充電容量推定期間において、蓄電池３の積算電流量をさらに大きくすることができるため、蓄電池３の満充電容量推定精度をより向上させることができる。   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.

また、本発明は、上記実施形態に限定されるものでなく、本発明の要旨を逸脱しない範囲内で種々の改良、変更が可能である。
図５は、電力供給制御部１０２の動作の他の例を示すフローチャートである。なお、図５に示すフローチャートにおいて、図４に示すフローチャートと同じ処理については説明を省略する。 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.

電力供給制御部１０２は、前回の満充電容量推定から所定時間が経過し（Ｓ４１：Ｙｅｓ）、かつ、蓄電池３の充電率が第１の所定値以上であるが（Ｓ４３：Ｙｅｓ）、所定の時間帯であるとき（Ｓ４３ａ：Ｎｏ）、通常の電力供給制御を行う（Ｓ４２）。所定の時間帯とは、蓄電池３の充電率が第１の所定値よりも大きい第２の所定値（例えば、図２（ａ）に示す第２の所定値）以上必要とされる時間帯であって、例えば、充電器１から車両Ｖｅへの電力供給が頻繁に行われる時間帯などである。   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.

また、図５に示すフローチャートにおいて、電力供給制御部１０２は、前回の満充電容量推定から所定時間が経過し（Ｓ４１：Ｙｅｓ）、かつ、蓄電池３の充電率が第１の所定値以上であり（Ｓ４３：Ｙｅｓ）、かつ、所定の時間帯以外であるとき（Ｓ４３ａ：Ｙｅｓ）、蓄電池３の充電率が第１の所定値よりも小さくなるまで、事前準備用の電力供給制御を行う（Ｓ４４、Ｓ４５：Ｎｏ）。   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).

例えば、図２（ｃ）に示すように、前回の満充電容量推定から所定時間（ｔ２１〜ｔ２２）が経過したとき、蓄電池３の充電率が第１の所定値以上であるが、所定の時間帯であると、電力供給制御部１０２は、通常の電力供給制御を行う。   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.

その後、蓄電池３の充電率が第１の所定値以上になり、かつ、所定の時間帯以外になると、電力供給制御部１０２は、蓄電池３の充電率が第１の所定値よりも小さくなるまで事前準備用の電力供給制御を行う（ｔ２３〜ｔ２４）。   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).

そして、事前準備期間後、電力供給制御部１０２は、系統電源Ｐから出力される電力に余裕があると判断すると、満充電容量推定が可能である旨を満充電容量推定部１０１に送り、満充電容量推定を開始した旨を受け取ってから満充電容量推定が終了した旨を受け取るまで満充電容量推定用の電力供給制御を行う（ｔ２５〜ｔ２６）。   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).

このように、図５に示すフローチャートでは、蓄電池３の前回の満充電容量推定から所定時間経過し、かつ、蓄電池３の充電率が第１の所定値以上のときで、かつ、所定の時間帯以外であるときに、系統電源Ｐから車両Ｖｅへの電力供給よりも蓄電池３から車両Ｖｅへの電力供給を優先し、系統電源Ｐから蓄電池３への電力供給を控えている。   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.

これにより、上記実施形態と同様に、満充電容量推定期間の前の事前準備期間において、蓄電池３の充電率を意図的に小さくすることができ、その分、満充電容量推定期間において、蓄電池３の積算電流量を大きくすることができる。そのため、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えそうになったとき車両Ｖｅに電力を供給できるように充電率が高くなっている蓄電池３に対して満充電容量を精度良く推定することができる。   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

また、図５に示すフローチャートでは、蓄電池３の前回の満充電容量推定から所定時間経過したとき、蓄電池３の充電率が第１の所定値以上であるが、所定の時間帯である場合、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないように、蓄電池３から車両Ｖｅへの電力供給よりも系統電源Ｐから車両Ｖｅへの電力供給を優先する。   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.

これにより、充電器１から車両Ｖｅへの電力供給が頻繁に行われる時間帯などにおいて、蓄電池３の充電率が小さくならないようにすることができるため、系統電源Ｐから出力される電力が閾値Ｗｔｈを超えないようにしつつ、車両Ｖｅに所望な電力を供給することができる。   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 充電器
２ 電力変換部
３ 蓄電池
４〜６ スイッチ
７、８ 電流検出部
９ 充電率推定部
１０ 制御部
１０１ 満充電容量推定部
１０２ 電力供給制御部
Ｐ 系統電源
Ｖｅ 車両
Ｂ 蓄電池
Ｃａ 充電ケーブル
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)

車両へ電力を供給する充電器であって、
蓄電池と、
充電終了時の前記蓄電池の充電率と充電開始時の前記蓄電池の充電率との差分で、充電中の前記蓄電池の積算電流量を除算することにより前記蓄電池の満充電容量を推定する満充電容量推定部と、
系統電源から出力される電力が閾値を超えないように、前記系統電源から前記車両への電力供給、前記系統電源から前記蓄電池への電力供給、及び前記蓄電池から前記車両への電力供給を制御する電力供給制御部と、
を備え、
前記電力供給制御部は、前記蓄電池の前回の満充電容量推定から所定時間経過し、かつ、前記蓄電池の充電率が第１の所定値以上のとき、前記系統電源から前記車両への電力供給よりも前記蓄電池から前記車両への電力供給を優先する
ことを特徴とする充電器。 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. 請求項１に記載の充電器であって、
前記電力供給制御部は、前記蓄電池の前回の満充電容量推定から前記所定時間経過し、かつ、前記蓄電池の充電率が前記第１の所定値以上のとき、前記系統電源から前記蓄電池への電力供給を控える
ことを特徴とする充電器。 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. 請求項１に記載の充電器であって、
前記電力供給制御部は、前記蓄電池の前回の満充電容量推定から前記所定時間経過し、かつ、前記蓄電池の充電率が前記第１の所定値以上のときで、かつ、前記蓄電池の充電率が前記第１の所定値よりも大きい第２の所定値以上必要とされる所定の時間帯以外のとき、前記系統電源から前記車両への電力供給よりも前記蓄電池から前記車両への電力供給を優先する
ことを特徴とする充電器。 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: 請求項３に記載の充電器であって、
前記電力供給制御部は、前記蓄電池の前回の満充電容量推定から前記所定時間経過し、かつ、前記蓄電池の充電率が前記第１の所定値以上のときで、かつ、前記所定の時間帯以外のとき、前記系統電源から前記蓄電池への電力供給を控える
ことを特徴とする充電器。 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. 請求項１〜４のうちの１項に記載の充電器であって、
前記電力供給制御部は、前記蓄電池の満充電容量を推定するために前記蓄電池を充電しているとき、前記蓄電池から前記車両への電力供給を控える
ことを特徴とする充電器。
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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