JP6573069B2 - Charge control device - Google Patents

Charge control device Download PDF

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JP6573069B2
JP6573069B2 JP2015153591A JP2015153591A JP6573069B2 JP 6573069 B2 JP6573069 B2 JP 6573069B2 JP 2015153591 A JP2015153591 A JP 2015153591A JP 2015153591 A JP2015153591 A JP 2015153591A JP 6573069 B2 JP6573069 B2 JP 6573069B2
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charging
battery
voltage difference
time
balancer
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JP2017034887A (en
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裕樹 河村
裕樹 河村
森田　博之
博之 森田
義晃 大田
義晃 大田
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Mitsubishi Motors 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
    • 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
    • Y02T90/14—Plug-in electric vehicles
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Description

本発明は、複数の電池セルと、普通充電時に作動して電池セルの放電を行うバランサ回路とを有するバッテリと、外部電源を用いてバッテリを充電する充電装置とを備える電動車両に搭載され、充電装置を制御する充電制御装置に関する。   The present invention is mounted on an electric vehicle including a plurality of battery cells, a battery having a balancer circuit that operates during normal charging and discharges the battery cells, and a charging device that charges the battery using an external power source. The present invention relates to a charging control device that controls a charging device.

電気自動車やプラグインハイブリッド自動車等の電動車両に搭載されるバッテリ（二次電池）は、例えば、家庭用電源による普通充電、又は専用電源を用いた急速充電により、電力が供給されるように構成されている。   A battery (secondary battery) mounted on an electric vehicle such as an electric vehicle or a plug-in hybrid vehicle is configured to be supplied with power by, for example, ordinary charging using a household power source or rapid charging using a dedicated power source. Has been.

バッテリは、複数の電池セルを備えており、充放電サイクルを繰り返しているうちに、各電池セル間の温度状態や劣化状況の違い等に起因して、各電池セル間に電圧差が生じてしまう。そして、バッテリの充電時には、各電池セルの最高電圧（最高セル電圧）が許容最高電圧に達すると充電を停止し、放電時には、各電池セルの最低電圧（最低セル電圧）が許容最低電圧になると放電を停止する。このため、バッテリを構成する各電池セルの電圧差が小さいほど、バッテリが本来有する電池容量をより多く使用することができる。したがって、バッテリを構成する各電池セルの電圧差は極力小さい状態に維持されていることが好ましい。   The battery includes a plurality of battery cells, and a voltage difference occurs between the battery cells due to a difference in temperature state or deterioration state between the battery cells while the charge / discharge cycle is repeated. End up. When the battery is charged, the charging is stopped when the maximum voltage (maximum cell voltage) of each battery cell reaches the allowable maximum voltage. When the battery is discharged, the minimum voltage (minimum cell voltage) of each battery cell becomes the allowable minimum voltage. Stop discharging. For this reason, the smaller the voltage difference between the battery cells constituting the battery, the more battery capacity that the battery originally has can be used. Therefore, it is preferable that the voltage difference between the battery cells constituting the battery is kept as small as possible.

しかしながら、バッテリを構成する各電池セルの電圧差は、バッテリを使用するに従い大きくなる。このため、実際に使用できるバッテリの電池容量は、バッテリを使用するに従い、徐々に減少してしまう。   However, the voltage difference between the battery cells constituting the battery increases as the battery is used. For this reason, the battery capacity of the battery that can actually be used gradually decreases as the battery is used.

このような問題を解消するために、電池セルを放電させるためのバランサ回路が各電池セルに対応して設けられたバッテリがある。バランサ回路の抵抗によって電圧の高い電池セルを放電させることで、各電池セル間の電圧差を低減させることができる（例えば、特許文献１参照）。   In order to solve such a problem, there is a battery in which a balancer circuit for discharging a battery cell is provided corresponding to each battery cell. By discharging the battery cell having a high voltage by the resistance of the balancer circuit, the voltage difference between the battery cells can be reduced (see, for example, Patent Document 1).

特開２０１２−１９１６７９号公報JP 2012-191679 A

このバランサ回路は、例えば、バッテリの普通充電時に作動させるが、電池セル間の電圧差が大きい場合には、普通充電中に、電池セル間の電圧差を十分に低減することができない虞がある。詳しくは、バランサ回路の抵抗の大きさ（抵抗値）は一定であり、またバッテリの普通充電時には、通常、一定の大きさの充電電流がバッテリに供給される。このため、電池セル間の電圧差が大きいと、普通充電の実行中にバランサ回路を作動させただけでは、電池セル間の電圧差を十分に低減することができない虞がある。   This balancer circuit is operated, for example, during normal charging of the battery. If the voltage difference between the battery cells is large, the voltage difference between the battery cells may not be sufficiently reduced during normal charging. . Specifically, the magnitude (resistance value) of the resistance of the balancer circuit is constant, and when the battery is normally charged, normally, a constant charging current is supplied to the battery. For this reason, if the voltage difference between the battery cells is large, there is a possibility that the voltage difference between the battery cells cannot be sufficiently reduced only by operating the balancer circuit during normal charging.

本発明は、このような事情に鑑みてなされたものであり、バッテリを構成する電池セル間の電圧差を適切に減少させることができる充電制御装置を提供することを目的とする。   This invention is made | formed in view of such a situation, and it aims at providing the charge control apparatus which can reduce the voltage difference between the battery cells which comprise a battery appropriately.

上記課題を解決する本発明の第１の態様は、複数の電池セルと、普通充電時に作動して前記電池セルの放電を行うバランサ回路とを有するバッテリと、外部電源を用いて前記バッテリを充電する充電装置とを備える電動車両に搭載され、前記充電装置を制御する充電制御装置であって、充電終了時刻を含む設定情報に基づいて、所定のタイミングで前記充電装置により前記バッテリに充電電流を供給して予約充電を実行する予約充電手段と、各電池セルの電圧を検出すると共に、各電池セル間の電圧差の最大値を算出する電圧差算出手段と、前記予約充電手段による前記予約充電の実行中に前記バランサ回路を作動させて前記電圧差の低減を図るバランサ作動手段と、前記電圧差の最大値が所定閾値以上である場合に、前記バランサ回路の作動時の前記充電電流を減少させる電流調整手段と、前記電圧差の解消に要する前記バランサ回路の作動時間を算出する作動時間算出手段と、を有し、前記電流調整手段は、前記バランサ回路が前記作動時間だけ作動するように前記充電電流を減少させることを特徴とする充電制御装置にある。 According to a first aspect of the present invention for solving the above-described problem, a battery having a plurality of battery cells, a balancer circuit that operates during normal charging and discharges the battery cells, and the battery is charged using an external power source. A charging control device that is mounted on an electric vehicle including a charging device that controls the charging device, and the charging device supplies a charging current to the battery at a predetermined timing based on setting information including a charging end time. a reservation charge means for executing the reservation charge is supplied, and detects the voltage of each battery cell, and the voltage difference calculating means for calculating the maximum value of the voltage difference between the battery cells, the reservation charging by the reservation charging means a balancer actuating means to reduce the voltage difference by operating the balancer circuit during execution of, when the maximum value of the voltage difference is equal to or greater than a predetermined threshold value, action of the balancer circuit Includes a current regulating means for reducing the charging current when the operating time calculating means for calculating the operating time of the balancer circuit required to eliminate the voltage difference, and the current adjusting means, the balancer circuit is the The charging control apparatus is characterized in that the charging current is decreased so as to operate only for an operating time .

本発明の第２の態様は、第１の態様の充電制御装置であって、前記電流調整手段は、前記電圧差の最大値が大きいほど前記充電電流を減少させることを特徴とする充電制御装置にある。 A second aspect of the present invention is the charge control apparatus according to the first aspect, wherein the current adjustment means decreases the charge current as the maximum value of the voltage difference increases. It is in.

本発明の第３の態様は、第１又は２の態様の充電制御装置であって、前記電圧差の解消を優先する電圧差解消優先モード、又は前記バッテリの充電を優先する充電優先モードを手動で選択する手動選択手段と、を備え、前記手動選択手段により前記電圧差解消優先モードが選択されている場合、前記予約充電手段は、前記バランサ回路が前記作動時間だけ作動するように前記充電終了時刻を遅らせることを特徴とする充電制御装置にある。 A third aspect of the present invention is the charge control device according to the first or second aspect, wherein the voltage difference elimination priority mode that prioritizes elimination of the voltage difference or the charge priority mode that prioritizes charging of the battery is manually performed. Manual selection means for selecting, when the voltage difference elimination priority mode is selected by the manual selection means, the reservation charging means terminates the charging so that the balancer circuit operates only for the operation time. The charging control apparatus is characterized by delaying the time.

本発明の第４の態様は、第１から３の何れか一つの態様の充電制御装置であって、前記バランサ作動手段は、前記バッテリのＳＯＣとＯＣＶとの関係に基づいて予め設定されているバランサ作動期間に前記バランサ回路を作動させることを特徴とする充電制御装置にある。 A fourth aspect of the present invention is the charge control device according to any one of the first to third aspects, wherein the balancer operating means is set in advance based on a relationship between the SOC and the OCV of the battery. In the charge control device, the balancer circuit is operated during a balancer operation period.

かかる本発明の充電制御装置によれば、予約充電時にバランサ回路を適切に作動させることができ、バッテリを構成する電池セル間の電圧差を効果的に減少させることができる。したがって、バッテリが本来有する電池容量をより多く使用することができるようになる。   According to such a charging control device of the present invention, the balancer circuit can be appropriately operated during reserved charging, and the voltage difference between the battery cells constituting the battery can be effectively reduced. Therefore, the battery capacity that the battery originally has can be used more.

本発明の一実施形態に係る電動車両の概略構成を示す図である。It is a figure showing the schematic structure of the electric vehicle concerning one embodiment of the present invention. バランサ回路を備えるバッテリの概略構成を説明するための模式図である。It is a schematic diagram for demonstrating schematic structure of a battery provided with a balancer circuit. 本発明の一実施形態に係る充電制御装置の概略構成を示すブロック図である。It is a block diagram which shows schematic structure of the charge control apparatus which concerns on one Embodiment of this invention. 従来技術に係る予約充電制御の一例を示すタイミングチャートである。It is a timing chart which shows an example of the reservation charge control which concerns on a prior art. 本発明に係る予約充電制御の一例を示すタイミングチャートである。It is a timing chart which shows an example of the reservation charge control which concerns on this invention. 本発明の一実施形態に係る充電制御装置の変形例を示すブロック図である。It is a block diagram which shows the modification of the charge control apparatus which concerns on one Embodiment of this invention. バッテリのＳＯＣ―ＯＣＶ特性の一例を示す図である。It is a figure which shows an example of the SOC-OCV characteristic of a battery. 本発明に係る予約充電制御の一例を示すタイミングチャートである。It is a timing chart which shows an example of the reservation charge control which concerns on this invention. 本発明に係る予約充電制御の一例を示すタイミングチャートである。It is a timing chart which shows an example of the reservation charge control which concerns on this invention.

以下、本発明を実施するための形態について説明する。
図１は電動車両の概略構成を示す図であり、図２はバッテリが備えるバランサ回路の概略構成を説明するための模式図であり、図３は電動車両の制御装置の概略構成を示すブロック図である。 Hereinafter, modes for carrying out the present invention will be described.
1 is a diagram showing a schematic configuration of an electric vehicle, FIG. 2 is a schematic diagram for explaining a schematic configuration of a balancer circuit included in a battery, and FIG. 3 is a block diagram showing a schematic configuration of a control device for the electric vehicle. It is.

本実施形態に係る電動車両１は、電気自動車（ＥＶ）であり、二次電池であるバッテリ２と、このバッテリ２からの電力供給により作動する電動機である走行用モータ３と、を備えている。走行用モータ３は、駆動機構４を介して駆動輪（本実施形態では、前輪）５に連結されている。   The electric vehicle 1 according to the present embodiment is an electric vehicle (EV), and includes a battery 2 that is a secondary battery and a traveling motor 3 that is an electric motor that operates by supplying power from the battery 2. . The traveling motor 3 is connected to driving wheels (in this embodiment, front wheels) 5 via a driving mechanism 4.

ここで、バッテリ２は、例えば、図２に示すように、直列に接続された複数の電池セル２１と、各電池セル２１に対応するバランサ回路２２と、を備えている。また各電池セル２１には、電池セル２１の電圧を検出するためのセル電圧モニタ（電圧検出手段）２３が設けられている。バランサ回路２２は、直列に接続されたスイッチ２４と抵抗２５とを、各電池セル２１に対応して備えている。このバランサ回路２２が設けられていることで、各電池セル２１間の電圧差を小さくして、バッテリ２の実質的な充電容量の低下を抑制することができるようになっている。   Here, for example, as illustrated in FIG. 2, the battery 2 includes a plurality of battery cells 21 connected in series and a balancer circuit 22 corresponding to each battery cell 21. Each battery cell 21 is provided with a cell voltage monitor (voltage detection means) 23 for detecting the voltage of the battery cell 21. The balancer circuit 22 includes a switch 24 and a resistor 25 connected in series corresponding to each battery cell 21. By providing the balancer circuit 22, the voltage difference between the battery cells 21 can be reduced, and a substantial reduction in the charge capacity of the battery 2 can be suppressed.

またバッテリ２は、急速充電及び普通充電の二つの充電方式に対応して外部電源による充電が可能となっている。急速充電とは、バッテリ２を短時間で充電することを目的とし、外部電源として専用の急速充電設備を用いて、バッテリ２に大電流（普通充電よりも大きい電流）を流すことにより行われる充電方式である。普通充電とは、外部電源として、例えば、家庭用電源等を使用し、バッテリ２に急速充電よりも少ない電流を流すことにより行われる充電方式である。   Further, the battery 2 can be charged by an external power source in accordance with two charging methods of quick charging and normal charging. The quick charging is intended to charge the battery 2 in a short time, and charging is performed by passing a large current (current larger than normal charging) through the battery 2 using a dedicated rapid charging facility as an external power source. It is a method. The normal charging is a charging method that is performed by using, for example, a household power source as an external power source, and flowing a smaller current to the battery 2 than the quick charging.

電動車両１のユーザは、バッテリ２の充電を行う際、普通充電又は急速充電の何れか一方の充電方式を選択して、所定の外部電源とバッテリ２とを接続して充電する。電動車両１には、外部電源に繋がる給電コネクタが接続される充電口（インレット）６が設けられている。なお充電口６は、普通充電用及び急速充電用にそれぞれ設けられていてもよいし、普通充電用及び急速充電用に共通し設けられていてもよい。   When charging the battery 2, the user of the electric vehicle 1 selects either the normal charging or the quick charging and connects the predetermined external power source and the battery 2 to charge. The electric vehicle 1 is provided with a charging port (inlet) 6 to which a power feeding connector connected to an external power source is connected. The charging port 6 may be provided for normal charging and quick charging, respectively, or may be provided in common for normal charging and quick charging.

また電動車両１には、バッテリ２を充電するための充電装置７が搭載されている。充電装置７は、バッテリ２と充電口６との間に介装されている。そして、例えば、バッテリ２を普通充電する際には、電動車両１の充電口６に接続された充電コネクタを介して家庭用電源と充電装置７とが接続され、充電装置７には家庭用電源から１００Ｖ程度の交流電力が入力される。充電装置７では、家庭用電源から入力された入力電力を３５０Ｖ程度の直流電力に変換・昇圧することで、バッテリ２の充電に適した充電電流とする。この充電電流をバッテリ２へ入力することで、バッテリ２が充電される。   The electric vehicle 1 is equipped with a charging device 7 for charging the battery 2. The charging device 7 is interposed between the battery 2 and the charging port 6. For example, when the battery 2 is normally charged, a household power source and the charging device 7 are connected via a charging connector connected to the charging port 6 of the electric vehicle 1, and the household power source is connected to the charging device 7. AC power of about 100V is input. The charging device 7 converts the input power input from the household power source into DC power of about 350 V and boosts it to obtain a charging current suitable for charging the battery 2. By inputting this charging current to the battery 2, the battery 2 is charged.

また電動車両１は、電動車両１の総合的な制御を行う制御装置１０を備えている。この制御装置１０は、例えばＣＰＵやＲＯＭ、ＲＡＭ等を集積したＬＳＩデバイスや組み込み電子デバイスとして構成され、電動車両１に設けられた車載ネットワーク網の通信ラインに接続されている。   The electric vehicle 1 also includes a control device 10 that performs comprehensive control of the electric vehicle 1. The control device 10 is configured as, for example, an LSI device or an embedded electronic device in which a CPU, a ROM, a RAM, and the like are integrated, and is connected to a communication line of an in-vehicle network provided in the electric vehicle 1.

そして制御装置１０は、電動車両１の制御の一つとして、充電装置７によるバッテリ２の充電を制御する。すなわち本実施形態に係る制御装置１０は、充電制御装置としての充電制御部１１を備え、この充電制御部１１が充電装置７によるバッテリ２の急速充電及び普通充電を制御する。   The control device 10 controls the charging of the battery 2 by the charging device 7 as one of the controls of the electric vehicle 1. That is, the control device 10 according to the present embodiment includes a charge control unit 11 as a charge control device, and the charge control unit 11 controls rapid charging and normal charging of the battery 2 by the charging device 7.

ここで、充電制御部１１は、普通充電として、マニュアル充電と共に予約充電を実行可能に構成されている。マニュアル充電とは、充電装置７と外部電源とが接続されると直ちに実行される通常の普通充電をいい、予約充電とは、充電装置７と家庭用電源とが接続された状態で、予約された充電終了時刻までに自動的に実行される普通充電をいう。   Here, the charge control unit 11 is configured to be able to execute reserved charging as well as manual charging as normal charging. Manual charging refers to normal normal charging that is performed immediately after the charging device 7 and an external power source are connected. Reserved charging is reserved in a state where the charging device 7 and the household power source are connected. Normal charging that is automatically performed before the end of charging.

そして本発明に係る充電制御部（充電制御装置）１１は、この予約充電時におけるバッテリ２の充電制御に特徴を有する。以下、充電制御部１１による予約充電時のバッテリ２の充電制御について詳細に説明する。   And the charge control part (charge control apparatus) 11 which concerns on this invention has the characteristics in charge control of the battery 2 at the time of this reservation charge. Hereinafter, charging control of the battery 2 at the time of reserved charging by the charging control unit 11 will be described in detail.

図３に示すように、充電制御部１１は、予約充電手段１２と、電圧差算出手段１３と、電圧差判定手段１４と、バランサ作動手段１５と、電流調整手段１６と、作動時間算出手段１７を有する。   As shown in FIG. 3, the charging control unit 11 includes a reserved charging unit 12, a voltage difference calculating unit 13, a voltage difference determining unit 14, a balancer operating unit 15, a current adjusting unit 16, and an operating time calculating unit 17. Have

予約充電手段１２は、例えば、電動車両１に設けられたナビゲーション装置８等からユーザによって入力される設定情報に基づいて、充電装置７によりバッテリ２に所定の充電電流を供給して予約充電を実行する。設定情報には、少なくとも予約充電の終了時刻（充電終了時刻）が含まれている。なお設定情報には、例えば、充電開始時刻や、充電動作を実行する時間（充電時間）等が含まれていてもよい。そして予約充電手段１２は、この設定情報に基づいて、基本的には充電終了時刻までに予約充電が終了するように充電装置７を適宜作動させて充電動作を実行する。   The reserved charging means 12 performs reserved charging by supplying a predetermined charging current to the battery 2 by the charging device 7 based on setting information input by the user from the navigation device 8 or the like provided in the electric vehicle 1, for example. To do. The setting information includes at least a reservation charging end time (charging end time). The setting information may include, for example, a charging start time, a time for performing a charging operation (charging time), and the like. Based on the setting information, the reserved charging means 12 basically operates the charging device 7 so that the reserved charging is completed before the charging end time, and executes the charging operation.

電圧差算出手段１３は、予約充電手段１２によって予約充電が実行される際に、バッテリ２が備えるセル電圧モニタ２３からの情報を取得して各電池セル２１の電圧を検出すると共に、それらの電圧差（最大値）Ｖｄを算出する。   The voltage difference calculation means 13 acquires information from the cell voltage monitor 23 provided in the battery 2 and detects the voltage of each battery cell 21 when reservation charging is executed by the reservation charging means 12, and those voltages The difference (maximum value) Vd is calculated.

電圧差判定手段１４は、電圧差算出手段１３によって算出された電圧差Ｖｄが、第１の閾値又は第２の閾値を超えているか否かを判定する。第１の閾値及び第２の閾値は、バッテリ２の電気容量等に基づいて適宜設定されている。すなわち電圧差判定手段１４は、電池セル２１間の電圧差の大きさを判定する。   The voltage difference determination unit 14 determines whether or not the voltage difference Vd calculated by the voltage difference calculation unit 13 exceeds the first threshold value or the second threshold value. The first threshold value and the second threshold value are appropriately set based on the electric capacity of the battery 2 and the like. That is, the voltage difference determination means 14 determines the magnitude of the voltage difference between the battery cells 21.

バランサ作動手段１５は、予約充電手段１２によってバッテリ２の予約充電が実行される際、バランサ回路２２を適宜動作させる。詳しくは、バランサ作動手段１５は、電圧差判定手段１４によって電池セル２１間の電圧差Ｖｄが第１の閾値以上であると判定されると、つまり電池セル２１間に電圧差が存在する場合には、電圧値が最大である電池セル２１に対応するスイッチ２４をオンにしてバランサ回路２２を作動させ、抵抗２５によりその電池セル２１を放電させる。このようにバランサ回路２２を適宜作動させることで、予約充電を実行する際に電池セル２１間の電圧差の低減を図ることができる。   The balancer operating unit 15 appropriately operates the balancer circuit 22 when the reserved charging unit 12 performs reserved charging of the battery 2. Specifically, the balancer actuating means 15 determines that the voltage difference determining means 14 determines that the voltage difference Vd between the battery cells 21 is greater than or equal to the first threshold, that is, if there is a voltage difference between the battery cells 21. Turns on the switch 24 corresponding to the battery cell 21 having the maximum voltage value, operates the balancer circuit 22, and discharges the battery cell 21 by the resistor 25. By appropriately operating the balancer circuit 22 in this way, it is possible to reduce the voltage difference between the battery cells 21 when performing reserved charging.

電流調整手段１６は、電池セル２１間の電圧差Ｖｄが所定閾値（本実施形態では、第１の閾値よりも大きい第２の閾値）以上である場合、つまり電池セル２１間の電圧差Ｖｄが比較的大きい場合、予約充電におけるバランサ回路２２の作動時の充電電流を適宜減少させる。なお電池セル２１間の電圧差Ｖｄが第２の閾値を超えている場合、バッテリ２が本来有する電池容量を適切に使用できていない状態であるといえる。   When the voltage difference Vd between the battery cells 21 is equal to or greater than a predetermined threshold value (a second threshold value that is larger than the first threshold value in this embodiment), that is, the current adjustment unit 16 has a voltage difference Vd between the battery cells 21. If it is relatively large, the charging current during the operation of the balancer circuit 22 in reserved charging is appropriately reduced. In addition, when the voltage difference Vd between the battery cells 21 exceeds the second threshold value, it can be said that the battery capacity originally possessed by the battery 2 is not properly used.

このような状態では、通常の充電電流で予約充電を行う時間だけでは、バランサ回路２２の作動により電池セル２１間の電圧差を十分に解消できない虞があるため、本発明では、バランサ回路２２の作動時の充電電流を適宜減少させている。   In such a state, there is a possibility that the voltage difference between the battery cells 21 cannot be sufficiently eliminated by the operation of the balancer circuit 22 only by the time for performing the reserved charging with the normal charging current. The charging current during operation is appropriately reduced.

充電電流が調整（低減）された場合、予約充電手段１２は、例えば、充電開始時刻Ｔ１を早めてバッテリ２の充電時間を延長することで、予約充電によるバッテリ２の充電量を確保する。すなわち予約充電手段１２は、充電電流が調整された場合でも、極力、予約終了時刻までにバッテリ２の予約充電を完了できるように充電時間を適宜制御する。そして、このように充電時間が長くなることに伴い、バランサ回路２２を作動できる時間も長くなる。このため、電池セル２１間の電圧差Ｖｄが比較的大きくても、予約充電時にその電圧差Ｖｄを十分に低減することができる。   When the charging current is adjusted (reduced), the reserved charging unit 12 ensures the amount of charge of the battery 2 by reserved charging, for example, by extending the charging start time T1 and extending the charging time of the battery 2. That is, the reserved charging means 12 appropriately controls the charging time so that the reserved charging of the battery 2 can be completed as much as possible even when the charging current is adjusted. As the charging time becomes longer, the time during which the balancer circuit 22 can be operated becomes longer. For this reason, even if the voltage difference Vd between the battery cells 21 is relatively large, the voltage difference Vd can be sufficiently reduced during reserved charging.

ここで、電流調整手段１６は、電池セル２１間の電圧差Ｖｄが大きいほど、通常時（電圧差が生じていない時）に比べて充電電流を減少させることが好ましい。これにより、電池セル２１間の電圧差Ｖｄを一回の予約充電によってより確実に低減させることができる。さらに、例えば、ナビゲーション装置８でユーザが予約充電の設定を行った設定時刻から充電終了時刻までの時間（設定時間）に余裕がある場合、つまり設定時間が充電時間よりも十分に長い場合、電流調整手段１６は、作動時間算出手段１７によって算出される作動時間だけバランサ回路２２が作動するように、充電電流を減少させることが好ましい。   Here, as the voltage difference Vd between the battery cells 21 is larger, it is preferable that the current adjusting unit 16 reduce the charging current as compared with the normal time (when no voltage difference is generated). Thereby, the voltage difference Vd between the battery cells 21 can be more reliably reduced by one reservation charge. Furthermore, for example, when there is a margin in the time (set time) from the set time when the user sets the reserved charge in the navigation device 8 to the charge end time, that is, when the set time is sufficiently longer than the charge time, The adjusting means 16 preferably reduces the charging current so that the balancer circuit 22 operates for the operating time calculated by the operating time calculating means 17.

作動時間算出手段１７は、例えば、バッテリ２の充電量（ＳＯＣ）、電池セル２１間の電圧差Ｖｄ、バランサ回路２２を構成する抵抗２５の抵抗値Ｒ１等に基づいて、電圧差Ｖｄの解消に要するバランサ回路２２の作動時間を算出する。すなわちバッテリ２の残量（ＳＯＣ）に基づく出力電圧と、抵抗２５の抵抗値から、バランサ回路２２の作動による電池セル２１の放電電流ｉが分かるため、その値に応じて、電圧差Ｖｄの解消に要するバランサ回路２２の作動時間を算出することができる。   The operating time calculation means 17 is used to eliminate the voltage difference Vd based on, for example, the amount of charge (SOC) of the battery 2, the voltage difference Vd between the battery cells 21, the resistance value R1 of the resistor 25 constituting the balancer circuit 22, and the like. The required operation time of the balancer circuit 22 is calculated. That is, since the discharge current i of the battery cell 21 due to the operation of the balancer circuit 22 is known from the output voltage based on the remaining amount (SOC) of the battery 2 and the resistance value of the resistor 25, the voltage difference Vd is eliminated according to the value. The operation time of the balancer circuit 22 required for the calculation can be calculated.

そして、この作動時間に対して設定時間が十分に長い場合、電流調整手段１６は、通常時の充電電流を減少させ、それに伴い、予約充電手段１２は、充電開始時刻を早める。したがって充電電流を減少させていない通常よりも充電時間が長くなり、バランサ回路２２を作動させることができる作動時間も長くなる。これにより、充電終了時刻までにバッテリ２の予約充電を完了することができ、且つ電池セル２１間の電圧差Ｖｄも十分に低減させることができる。   When the set time is sufficiently longer than the operation time, the current adjusting unit 16 decreases the normal charging current, and accordingly, the reserved charging unit 12 advances the charging start time. Therefore, the charging time becomes longer than usual when the charging current is not reduced, and the operating time during which the balancer circuit 22 can be operated also becomes longer. Thereby, the reserved charge of the battery 2 can be completed by the charge end time, and the voltage difference Vd between the battery cells 21 can be sufficiently reduced.

ただし、通常の予約充電時には、予め設定された充電電流をバッテリ２に供給しており、充電動作を実行する充電時間は、この通常時の充電電流とバッテリ２の残量等で決定される。このため、電池セル２１間の電圧差Ｖｄが比較的大きいと、充電時間中にバランサ回路２２を作動させただけでは、対応する電池セル２１を十分に放電させることができず、電池セル２１間の電圧差Ｖｄを十分に低減させることができない虞がある。   However, at the time of normal reserved charging, a preset charging current is supplied to the battery 2, and the charging time for performing the charging operation is determined by the normal charging current, the remaining amount of the battery 2, and the like. For this reason, if the voltage difference Vd between the battery cells 21 is relatively large, the corresponding battery cell 21 cannot be sufficiently discharged only by operating the balancer circuit 22 during the charging time. The voltage difference Vd may not be sufficiently reduced.

しかしながら、本発明に係る充電制御部（充電制御装置）１１では、電圧差Ｖｄが比較的大きい場合には、バランサ回路２２の作動時の充電電流を、通常時の充電電流に比べて適宜減少させるようにしているため、予約充電時に、電池セル２１間の電圧差Ｖｄを効果的に低減させることができる。   However, in the charge control unit (charge control device) 11 according to the present invention, when the voltage difference Vd is relatively large, the charge current during operation of the balancer circuit 22 is appropriately reduced as compared with the normal charge current. Thus, the voltage difference Vd between the battery cells 21 can be effectively reduced during reserved charging.

次に、図４及び図５のタイムチャートを参照して、本実施形態に係る充電制御装置によるバッテリの充電制御について、さらに詳細に説明する。
図４及び図５に示すように、例えば、時刻（設定時刻）Ｔ１に、充電終了時刻Ｔ２を含む設定情報が、電動車両１のユーザによってナビゲーション装置８等により設定されたとする。予約充電の設定情報が設定されると、まずは、通常の充電電流Ｉａで満充電までバッテリ２を充電するのに要する充電時間Ｔａを算出する。さらに予約充電の設定時刻（例えば、現在時刻）Ｔ１から充電終了時刻Ｔ２までの時間（設定時間）Ｔｂを算出する。 Next, with reference to the time charts of FIGS. 4 and 5, the charging control of the battery by the charging control device according to the present embodiment will be described in more detail.
As shown in FIGS. 4 and 5, for example, it is assumed that setting information including the charging end time T2 is set by the user of the electric vehicle 1 by the navigation device 8 or the like at time (set time) T1. When the setting information for reserved charging is set, first, the charging time Ta required to charge the battery 2 until full charging is calculated with the normal charging current Ia. Further, a time (set time) Tb from the set time (for example, current time) T1 to the charge end time T2 of the reserved charge is calculated.

また充電終了時刻Ｔ２までにバッテリ２の予約充電を完了する（本実施形態ではバッテリ２を満充電とする）ために、それに必要な充電開始時刻Ｔ３を算出する。すなわち充電時間Ｔａを充電終了時刻Ｔ２から逆算することで、充電開始時刻Ｔ３が求められる。   Further, in order to complete the reserved charging of the battery 2 by the charging end time T2 (in this embodiment, the battery 2 is fully charged), a charging start time T3 required for it is calculated. That is, the charging start time T3 is obtained by calculating the charging time Ta backward from the charging end time T2.

そして従来は、図４に示すように、電池セル２１間の電圧差に拘わらず、設定時刻Ｔ１から所定の待機時間Ｔｃを経て、充電開始時刻Ｔ３になると、通常の充電電流Ｉａでバッテリ２の充電動作が開始（ＯＮ）される。その際、電池セル２１間の電圧差Ｖｄ（Ｖｄ１）が生じている場合には、充電開始と共にバランサ回路２２を作動させる（バランサ回路ＯＮ）。これにより、電池セル２１間の電圧差Ｖｄの低減を図ることができる。ただし、電池セル２１間の電圧差Ｖｄが比較的大きい場合、その効果は小さい。すなわち予約充電開始時の電圧差Ｖｄ１が大きい場合、充電終了時Ｔ２の電圧差Ｖｄ２は充電開始時刻の電圧差Ｖｄ１に対して大きく減少しないことがある。   And conventionally, as shown in FIG. 4, regardless of the voltage difference between the battery cells 21, when the charging start time T3 is reached after the predetermined standby time Tc from the set time T1, the battery 2 is charged with the normal charging current Ia. The charging operation is started (ON). At this time, if a voltage difference Vd (Vd1) between the battery cells 21 is generated, the balancer circuit 22 is activated at the same time as charging is started (balancer circuit ON). Thereby, the voltage difference Vd between the battery cells 21 can be reduced. However, when the voltage difference Vd between the battery cells 21 is relatively large, the effect is small. That is, when the voltage difference Vd1 at the start of reserved charging is large, the voltage difference Vd2 at the end of charging T2 may not be significantly reduced with respect to the voltage difference Vd1 at the charging start time.

一方、本実施形態では、さらにバッテリ２の残量、電圧差Ｖｄ、バランサ回路２２を構成する抵抗２５の大きさ（抵抗値）等に基づいて、電圧差Ｖｄの解消に要するバランサ回路２２の作動時間Ｔｄを算出する。そして図５に示すように、作動時間Ｔｄが充電時間Ｔａよりも長い場合には、通常よりも減少させた充電電流Ｉｂでバッテリ２の充電を行うことで、バッテリ２の充電時間Ｔａを長く確保する。そして、充電開始（充電動作ＯＮ）と共にバランサ回路２２を作動させ（バランサ回路ＯＮ）、充電終了（充電動作ＯＦＦ）と共にバランサ回路２２の作動も終了させている（バランサ回路ＯＦＦ）。これにより、バランサ回路２２の作動時間Ｔｄも長くなるため、電圧差Ｖｄをより確実に低減させることができる。すなわち充電終了時刻Ｔ２の電圧差Ｖｄ２は、充電開始時刻Ｔ３の電圧差Ｖｄ１に対して大きく減少する。   On the other hand, in the present embodiment, the operation of the balancer circuit 22 required to eliminate the voltage difference Vd is further based on the remaining amount of the battery 2, the voltage difference Vd, the size (resistance value) of the resistor 25 constituting the balancer circuit 22, and the like. Time Td is calculated. As shown in FIG. 5, when the operation time Td is longer than the charging time Ta, the battery 2 is charged with a charging current Ib that is decreased from the normal time, thereby ensuring a long charging time Ta of the battery 2. To do. Then, the balancer circuit 22 is actuated at the start of charging (charging operation ON) (balancer circuit ON), and the operation of the balancer circuit 22 is terminated at the end of charging (charging operation OFF) (balancer circuit OFF). As a result, the operation time Td of the balancer circuit 22 is also lengthened, so that the voltage difference Vd can be reduced more reliably. That is, the voltage difference Vd2 at the charging end time T2 greatly decreases with respect to the voltage difference Vd1 at the charging start time T3.

例えば、設定時間Ｔｂが作動時間Ｔｄに対して十分に長い場合には、図５に示すように、バッテリ２の充電開始時刻Ｔ３を早めることで、充電終了時刻Ｔ２までに予約充電を完了させることができる。これにより、ユーザの希望する時刻までに予約充電を終了させ、且つ電池セル２１間の電圧差Ｖｄも十分に抑制することができる。なお、このような充電動作をマニュアル充電時に実行すると、充電終了時刻が遅れてしまうことになるが、予約充電時に実行することで、充電終了時刻を遅らせなくても、電池セル２１間の電圧差Ｖｄを十分に低減させることができる。   For example, when the set time Tb is sufficiently longer than the operation time Td, the reserved charging is completed by the charging end time T2 by advancing the charging start time T3 of the battery 2 as shown in FIG. Can do. Thereby, reservation charge is complete | finished by the time which a user desires, and the voltage difference Vd between the battery cells 21 can also be fully suppressed. Note that if such a charging operation is performed during manual charging, the charging end time will be delayed. However, if the charging operation is performed during reserved charging, the voltage difference between the battery cells 21 can be achieved without delaying the charging end time. Vd can be sufficiently reduced.

ここで、電流調整手段１６による充電電流の調整量は、電池セル２１間の電圧差Ｖｄに応じて適宜決定されればよいが、電池セル２１間の電圧差（最大値）Ｖｄが大きいほど充電電流の減少量も大きくすることが好ましい。さらに、電流調整手段１６は、バランサ回路２２が、作動時間算出手段１７によって算出された作動時間Ｔｄだけ作動するように充電電流を適宜減少させることが好ましい。言い換えれば、充電電流の減少量は極力小さくすることが好ましい。これにより充電効率の低下を抑えつつ電池セル２１間の電圧差Ｖｄを減少させることができる。   Here, the amount of adjustment of the charging current by the current adjusting means 16 may be appropriately determined according to the voltage difference Vd between the battery cells 21, but the charging is performed as the voltage difference (maximum value) Vd between the battery cells 21 increases. It is also preferable to increase the amount of decrease in current. Furthermore, it is preferable that the current adjusting unit 16 appropriately reduce the charging current so that the balancer circuit 22 operates only for the operation time Td calculated by the operation time calculating unit 17. In other words, it is preferable to reduce the reduction amount of the charging current as much as possible. Thereby, the voltage difference Vd between the battery cells 21 can be reduced while suppressing a decrease in charging efficiency.

ところで、本実施形態に係る充電制御部１１による予約充電では、原則として充電終了時刻Ｔ２までに予約充電が終了するように制御される。すなわち充電終了時刻Ｔ２になると、バッテリ２の残量が所望の充電量に達していなくても充電動作が停止されるようになっている。しかしながら、充電終了時刻Ｔ２を必要に応じて遅らせるようにしてもよい。   By the way, in the reserved charging by the charging control unit 11 according to the present embodiment, in principle, the reserved charging is controlled to be completed by the charging end time T2. That is, when the charging end time T2 is reached, the charging operation is stopped even if the remaining amount of the battery 2 does not reach the desired charging amount. However, the charging end time T2 may be delayed as necessary.

例えば、図６に示すように、制御装置１０が、手動選択手段としての切り換えスイッチ１８を備え、この切り換えスイッチ１８により、例えば、電池セル２１間の電圧差Ｖｄの解消を優先する電圧差解消優先モード、又はバッテリの充電終了時刻を優先する時刻優先モードとを手動で選択可能とする。   For example, as shown in FIG. 6, the control device 10 includes a changeover switch 18 as manual selection means, and the changeover switch 18 gives priority to voltage difference elimination priority, for example, to eliminate the voltage difference Vd between the battery cells 21. It is possible to manually select a mode or a time priority mode that prioritizes the battery charging end time.

そして、切り換えスイッチ１８により電圧差解消優先モードが選択されている場合には、バランサ回路２２が作動時間Ｔｄだけ作動するように充電終了時刻を遅らせるようにしてもよい。すなわち、作動時間Ｔｄが設定時間Ｔｂよりも長い場合には（図４，５参照）、充電終了時刻Ｔ２を超えて充電動作（バランサ回路２２の作動）を継続するようにしてもよい。
これにより、ユーザの意志に応じて、電池セル２１間の電圧差Ｖｄをより確実に解消することができる。 When the voltage difference elimination priority mode is selected by the changeover switch 18, the charging end time may be delayed so that the balancer circuit 22 operates only for the operation time Td. That is, when the operation time Td is longer than the set time Tb (see FIGS. 4 and 5), the charging operation (operation of the balancer circuit 22) may be continued beyond the charging end time T2.
Thereby, according to a user's will, the voltage difference Vd between the battery cells 21 can be eliminated more reliably.

ところで、バランサ回路２２を作動させるタイミングは、ＯＣＶ（開放電圧）の変化が比較的小さい期間に作動させることが好ましい。言い換えれば、バランサ回路２２は、バッテリ２のＳＯＣ（充電率）とＯＣＶとの関係に基づいて予め設定されるバランサ作動期間に作動させることが好ましい。例えば、図７に示すように、バッテリ２の特性として、ＳＯＣがＸ％よりも低い状態、及びＳＯＣがＹ％よりも高い状態では、ＯＣＶの変化が大きい傾向にあるとする。この場合には、ＯＣＶの変化が比較的小さいバッテリのＳＯＣがＸ％からＹ％である期間をバランサ作動期間として設定し、このバランサ作動期間にバランサ回路２２が作動させることが好ましい。例えば、充電制御部１１が、このようなＳＯＣ−ＯＣＶ特性グラフを、所定のマップとして備えておき、そのマップに基づいて、バランサ回路２２を適宜作動させることが好ましい。   By the way, it is preferable to operate the balancer circuit 22 during a period in which a change in OCV (open voltage) is relatively small. In other words, the balancer circuit 22 is preferably operated during a balancer operation period set in advance based on the relationship between the SOC (charge rate) of the battery 2 and the OCV. For example, as shown in FIG. 7, it is assumed that the change in OCV tends to be large when the SOC is lower than X% and the SOC is higher than Y% as the characteristics of the battery 2. In this case, it is preferable to set a period in which the SOC of the battery having a relatively small change in OCV is from X% to Y% as the balancer operation period, and to operate the balancer circuit 22 during this balancer operation period. For example, it is preferable that the charge control unit 11 includes such a SOC-OCV characteristic graph as a predetermined map and appropriately operates the balancer circuit 22 based on the map.

図８は、バッテリの残量がＸ％よりも少ない状態でバッテリの予約充電を行った場合のタイミングチャートである。
この例では、充電開始時刻Ｔ３になると、まずは通常の充電電流Ｉａでの充電動作を実行する。その後、バッテリ２のＳＯＣがＸ％まで回復した時点（時刻Ｔ４）で、充電電流を減少させると共にバランサ回路２２を作動させ、バッテリ２のＳＯＣがＹ％に達した時点（時刻Ｔ５）で、バランサ回路２２の作動を停止させることが好ましい。さらにこの場合も、バランサ回路２２を作動させている期間（Ｔ４−Ｔ５間）が、作動時間算出手段１７によって算出された作動時間Ｔｄと一致するように設定されていることが望ましい。これにより電池セル２１間の電圧差Ｖｄをより適切に低減させることができる。 FIG. 8 is a timing chart when the reserved charge of the battery is performed in a state where the remaining amount of the battery is less than X%.
In this example, when the charging start time T3 is reached, first, the charging operation with the normal charging current Ia is executed. Thereafter, when the SOC of the battery 2 recovers to X% (time T4), the charging current is reduced and the balancer circuit 22 is operated. When the SOC of the battery 2 reaches Y% (time T5), the balancer is It is preferable to stop the operation of the circuit 22. Further in this case, it is desirable that the period during which the balancer circuit 22 is operated (between T4 and T5) is set so as to coincide with the operation time Td calculated by the operation time calculation means 17. Thereby, the voltage difference Vd between the battery cells 21 can be reduced more appropriately.

なお、本実施形態では、バランサ回路２２の作動を停止した後も、減少させた充電電流Ｉｂでバッテリ２の充電を継続しているが、バランサ回路２２の作動を停止した後は、通常の充電電流Ｉａに戻すようにしてもよい。   In the present embodiment, the battery 2 is continuously charged with the reduced charging current Ib even after the operation of the balancer circuit 22 is stopped. However, after the operation of the balancer circuit 22 is stopped, normal charging is performed. You may make it return to the electric current Ia.

また上述の実施形態では、バランサ回路２２の作動時の充電電流を低減し、バッテリ２の充電を行いつつ所定電池セル２１の放電を行うようにしたが、設定時間Ｔｂに十分な余裕があれば、バッテリ２の充電と、電池セル２１の放電とは異なるタイミングで実施するようにしてもよい。例えば、図９に示すように、充電開始時刻Ｔ３になると、充電動作は開始するものの、まずはバッテリ２に対して実質的に充電電流を供給することなく（充電電流を実質的にゼロとなるように減少させて）バランサ回路２２を作動させる。すなわち、充電開始時刻Ｔ３になると、まずは所定の電池セル２１の放電を行う。そして、電池セル２１間の電圧差Ｖｄが実質的に解消した時点（時刻Ｔ６）で、バッテリ２に通常の充電電流Ｉａを供給して充電終了時刻Ｔ２までバッテリ２を充電するようにしてもよい。   In the above-described embodiment, the charging current during operation of the balancer circuit 22 is reduced, and the predetermined battery cell 21 is discharged while charging the battery 2. However, if the set time Tb has a sufficient margin, The charging of the battery 2 and the discharging of the battery cell 21 may be performed at different timings. For example, as shown in FIG. 9, at the charging start time T3, the charging operation starts, but first, the charging current is not substantially supplied to the battery 2 (the charging current is substantially zero). The balancer circuit 22 is activated. That is, when the charging start time T3 is reached, the predetermined battery cell 21 is first discharged. Then, when the voltage difference Vd between the battery cells 21 is substantially eliminated (time T6), the battery 2 may be charged until the normal charging current Ia is supplied to the battery 2 until the charging end time T2. .

この場合にも、ユーザの希望する時刻までには予約充電が終了し、且つ電池セル２１間の電圧差Ｖｄも十分に抑制することができる。   Also in this case, the reserved charging is completed by the time desired by the user, and the voltage difference Vd between the battery cells 21 can be sufficiently suppressed.

以上、本発明の一実施形態について説明したが、勿論、本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨から逸脱しない範囲内で、構成の付加、省略、置換、およびその他の変更が可能である。   As mentioned above, although one embodiment of the present invention has been described, of course, the present invention is not limited to the above-described embodiment, and addition, omission, replacement, etc., of a configuration is possible without departing from the spirit of the present invention. And other changes are possible.

例えば、上述の実施形態では、電池セルの電圧を検出すると共に、その電圧差を算出し、この電圧差が所定閾値以上である場合に、バランサ回路の作動時の充電電流を減少させるようにしたが、必ずしも電圧セルの電圧を検出しなくてもよい。例えば、普通充電を実行した履歴を管理し、普通充電が一定期間以上実行されていない場合には、電圧差が所定閾値以上であると推定し、バランサ回路の作動時の充電電圧を適宜減少させるようにしてもよい。   For example, in the above-described embodiment, the voltage of the battery cell is detected and the voltage difference is calculated, and when the voltage difference is equal to or larger than a predetermined threshold, the charging current during operation of the balancer circuit is decreased. However, it is not always necessary to detect the voltage of the voltage cell. For example, the history of performing normal charging is managed, and when normal charging has not been performed for a certain period of time, the voltage difference is estimated to be equal to or greater than a predetermined threshold, and the charging voltage during operation of the balancer circuit is appropriately reduced. You may do it.

また例えば、上述の実施形態では、設定情報を、車両が備えるナビゲーション装置を介して入力する構成を説明したが、例えば、無線通信可能な携帯電話機やスマートフォン等の携帯機器を介して設定情報を入力する構成としてもよい。   Further, for example, in the above-described embodiment, the configuration information is input via the navigation device included in the vehicle. However, for example, the setting information is input via a mobile device such as a mobile phone or a smartphone capable of wireless communication. It is good also as composition to do.

また上述の実施形態では、予約充電によりバッテリを満充電まで充電する場合を例示したが、予約充電によりどの程度までバッテリを充電するかは、ユーザにより設定できるようにしてもよい。   Further, in the above-described embodiment, the case where the battery is charged to the full charge by the reservation charge is illustrated, but the extent to which the battery is charged by the reservation charge may be set by the user.

また例えば、上述の実施形態では、電動車両として電気自動車を一例として本発明を説明したが、勿論、本発明は、駆動用モータと共にエンジン（内燃機関）を備えるハイブリッド自動車等にも適用可能なものである。   Further, for example, in the above-described embodiment, the present invention has been described by taking an electric vehicle as an example of an electric vehicle. However, the present invention can also be applied to a hybrid vehicle including an engine (internal combustion engine) together with a drive motor. It is.

１ 電動車両
２ バッテリ
３ 走行用モータ
４ 駆動機構
５ 駆動輪
６ 充電口
７ 充電装置
１０ 制御装置
２１ 電池セル
２２ バランサ回路
２３ セル電圧モニタ
２４ スイッチ
２５ 抵抗
DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Battery 3 Driving motor 4 Drive mechanism 5 Drive wheel 6 Charging port 7 Charging device 10 Control device 21 Battery cell 22 Balancer circuit 23 Cell voltage monitor 24 Switch 25 Resistance

Claims (4)

複数の電池セルと、普通充電時に作動して前記電池セルの放電を行うバランサ回路とを有するバッテリと、外部電源を用いて前記バッテリを充電する充電装置とを備える電動車両に搭載され、前記充電装置を制御する充電制御装置であって、
充電終了時刻を含む設定情報に基づいて、所定のタイミングで前記充電装置により前記バッテリに充電電流を供給して予約充電を実行する予約充電手段と、
各電池セルの電圧を検出すると共に、各電池セル間の電圧差の最大値を算出する電圧差算出手段と、
前記予約充電手段による前記予約充電の実行中に前記バランサ回路を作動させて前記電圧差の低減を図るバランサ作動手段と、
前記電圧差の最大値が所定閾値以上である場合に、前記バランサ回路の作動時の前記充電電流を減少させる電流調整手段と、
前記電圧差の解消に要する前記バランサ回路の作動時間を算出する作動時間算出手段と、を有し、
前記電流調整手段は、前記バランサ回路が前記作動時間だけ作動するように前記充電電流を減少させる
ことを特徴とする充電制御装置。 The battery is mounted on an electric vehicle including a battery having a plurality of battery cells, a balancer circuit that operates during normal charging and discharges the battery cells, and a charging device that charges the battery using an external power source, and the charging A charge control device for controlling the device,
Based on the setting information including the charging end time, reserved charging means for supplying a charging current to the battery by the charging device at a predetermined timing and executing reserved charging;
It detects a voltage of each battery cell, and the voltage difference calculating means for calculating the maximum value of the voltage difference between the battery cells,
Balancer operating means for operating the balancer circuit to reduce the voltage difference during execution of the reserved charging by the reserved charging means;
Current adjustment means for reducing the charging current during operation of the balancer circuit when the maximum value of the voltage difference is equal to or greater than a predetermined threshold ;
An operation time calculating means for calculating an operation time of the balancer circuit required to eliminate the voltage difference,
The charging control device according to claim 1, wherein the current adjusting means reduces the charging current so that the balancer circuit operates for the operating time . 請求項１に記載の充電制御装置であって、
前記電流調整手段は、前記電圧差の最大値が大きいほど前記充電電流を減少させる
ことを特徴とする充電制御装置。 The charge control device according to claim 1,
The charging control device according to claim 1, wherein the current adjusting unit decreases the charging current as the maximum value of the voltage difference increases. 請求項１又は２に記載の充電制御装置であって、
前記電圧差の解消を優先する電圧差解消優先モード、又は前記バッテリの充電を優先する充電優先モードを手動で選択する手動選択手段と、を備え、
前記手動選択手段により前記電圧差解消優先モードが選択されている場合、前記予約充電手段は、前記バランサ回路が前記作動時間だけ作動するように前記充電終了時刻を遅らせる
ことを特徴とする充電制御装置。 The charge control device according to claim 1 or 2 ,
Manual selection means for manually selecting a voltage difference cancellation priority mode that prioritizes cancellation of the voltage difference, or a charge priority mode that prioritizes charging of the battery,
When the voltage difference elimination priority mode is selected by the manual selection unit, the reserved charging unit delays the charging end time so that the balancer circuit operates only for the operation time. . 請求項１から３の何れか一項に記載の充電制御装置であって、
前記バランサ作動手段は、前記バッテリのＳＯＣとＯＣＶとの関係に基づいて予め設定されているバランサ作動期間に前記バランサ回路を作動させる
ことを特徴とする充電制御装置。 The charge control device according to any one of claims 1 to 3 ,
The charge control device, wherein the balancer operating means operates the balancer circuit during a balancer operating period set in advance based on a relationship between SOC and OCV of the battery.
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