JP7012606B2 - Battery charger - Google Patents

Battery charger Download PDF

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JP7012606B2
JP7012606B2 JP2018105931A JP2018105931A JP7012606B2 JP 7012606 B2 JP7012606 B2 JP 7012606B2 JP 2018105931 A JP2018105931 A JP 2018105931A JP 2018105931 A JP2018105931 A JP 2018105931A JP 7012606 B2 JP7012606 B2 JP 7012606B2
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battery
charging
internal resistance
resistance value
plan
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JP2019213312A (en
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真吾 槌矢
誠二 鎌田
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Hitachi Astemo Ltd
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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
    • Y02T90/14—Plug-in electric vehicles

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  • 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、バッテリ充電装置に関する。 The present invention relates to a battery charging device.

下記特許文献１には、車両のバッテリを充電したときに発生する当該バッテリの内部抵抗の発熱で、当該バッテリを暖機するバッテリ充電装置が記載されている。 The following Patent Document 1 describes a battery charging device that warms up the battery by the heat generated by the internal resistance of the battery generated when the battery of the vehicle is charged.

このバッテリ充電装置は、車両の使用を開始する時刻（以下、「次回開始時刻」という。）の直前に、バッテリを暖機させておくことができるように充電計画を作成し、この充電計画に基づいて事前にバッテリを充電する。 This battery charging device creates a charging plan so that the battery can be warmed up immediately before the time when the vehicle starts to be used (hereinafter referred to as "next start time"), and this charging plan is used. Charge the battery in advance based on.

特開２０１０－８８２０４号公報Japanese Unexamined Patent Publication No. 2010-88204

しかしながら、特許文献１に記載のバッテリ充電装置は、充電計画を作成するにあたって、バッテリの劣化を考慮していない。そのため、次回開始時刻の直前にバッテリの温度を目標値に制御することができず、最適な充電計画を作成することができない場合がある。 However, the battery charging device described in Patent Document 1 does not consider the deterioration of the battery in creating the charging plan. Therefore, it may not be possible to control the battery temperature to the target value immediately before the next start time, and it may not be possible to create an optimum charging plan.

本発明は、このような事情に鑑みてなされたもので、その目的は、充電によるバッテリの内部抵抗の発熱で当該バッテリを暖機するバッテリ充電装置において、最適な充電計画を作成することである。 The present invention has been made in view of such circumstances, and an object thereof is to create an optimum charging plan in a battery charging device that warms up the battery by heat generation of the internal resistance of the battery due to charging. ..

本発明の一態様は、車載用のバッテリの充電を行うとともに、前記充電による前記バッテリの内部抵抗の発熱によって当該バッテリを暖機するバッテリ充電装置であって、前記バッテリの使用開始時刻に前記バッテリが所定温度以上になるような前記バッテリの充電計画を作成する充電計画作成部と、前記充電計画に従って前記バッテリを定電流充電する充電制御部と、を備え、前記充電計画作成部は、前記バッテリの劣化に応じて変化する前記バッテリの内部抵抗値をパラメータとして前記充電計画を作成することを特徴とする、バッテリ充電装置である。 One aspect of the present invention is a battery charging device that charges a vehicle-mounted battery and warms the battery by the heat generated by the internal resistance of the battery due to the charging, and the battery is used at the start time of the battery. A charging plan creating unit that creates a charging plan for the battery so that the temperature becomes equal to or higher than a predetermined temperature, and a charging control unit that charges the battery with a constant current according to the charging plan. The charging plan creating unit is the battery. The battery charging device is characterized in that a charging plan is created using the internal resistance value of the battery, which changes according to the deterioration of the battery, as a parameter.

本発明の一態様は、上述のバッテリ充電装置であって、前記充電計画作成部は、前記バッテリの劣化に応じて変化する前記内部抵抗値と、前記定電流充電における充電電流値とをパラメータとして前記充電計画を作成し、前記充電電流値は、前記内部抵抗値が上昇するに従って小さくなるように設定される。 One aspect of the present invention is the battery charging device described above, wherein the charging plan creating unit uses the internal resistance value that changes according to the deterioration of the battery and the charging current value in the constant current charging as parameters. The charging plan is created, and the charging current value is set to decrease as the internal resistance value increases.

本発明の一態様は、上述のバッテリ充電装置であって、前記バッテリの充電を行う時間帯における前記バッテリの周囲の予測気温を事前に取得する予測気温取得部を更に備え、前記充電計画作成部は、前記バッテリの劣化に応じて変化する前記内部抵抗値、前記定電流充電における充電電流値、及び前記予測気温取得部により事前に取得された前記予測気温をパラメータとして前記充電計画を作成する。 One aspect of the present invention is the above-mentioned battery charging device, further comprising a predicted temperature acquisition unit that acquires in advance the predicted temperature around the battery in the time zone for charging the battery, and the charging plan creation unit. Creates the charging plan with the internal resistance value that changes according to the deterioration of the battery, the charging current value in the constant current charging, and the predicted temperature acquired in advance by the predicted temperature acquisition unit as parameters.

本発明の一態様は、上述のバッテリ充電装置であって、前記バッテリの経年、及びバッテリの使用回数の少なくともいずれかによって前記内部抵抗値を算出する内部抵抗値算出部を更に備え、前記充電計画作成部は、前記内部抵抗値算出部により算出された前記内部抵抗値を用いて前記充電計画を作成する。 One aspect of the present invention is the battery charging device described above, further comprising an internal resistance value calculation unit that calculates the internal resistance value according to at least one of the aging of the battery and the number of times the battery has been used, and the charging plan. The creating unit creates the charging plan using the internal resistance value calculated by the internal resistance value calculating unit.

本発明の一態様は、上述のバッテリ充電装置であって、前記内部抵抗値を測定する内部抵抗値測定部を更に備え、前記充電計画作成部は、前記内部抵抗値測定部により測定された前記内部抵抗値を用いて、前記充電計画を作成する。 One aspect of the present invention is the battery charging device described above, further comprising an internal resistance value measuring unit for measuring the internal resistance value, and the charging plan creating unit is the battery charging device measured by the internal resistance value measuring unit. The charging plan is created using the internal resistance value.

以上説明したように、本発明によれば、充電によるバッテリの内部抵抗の発熱で当該バッテリを暖機するバッテリ充電装置において、最適な充電計画を作成することができる。 As described above, according to the present invention, it is possible to create an optimum charging plan in a battery charging device that warms up the battery by generating heat of the internal resistance of the battery due to charging.

本発明の一実施形態に係るバッテリ充電システムＡの概略構成の一例を示す図である。It is a figure which shows an example of the schematic structure of the battery charging system A which concerns on one Embodiment of this invention. 本発明の一実施形態に係る記憶部２５１に格納される情報の一例をテーブル形式で示す図である。It is a figure which shows an example of the information stored in the storage part 251 which concerns on one Embodiment of this invention in a table format. 本発明の一実施形態に係る外部充電器２７の構成図である。It is a block diagram of the external charger 27 which concerns on one Embodiment of this invention. 本発明の一実施形態に係るバッテリ１の過渡熱抵抗特性を示す図である。It is a figure which shows the transient thermal resistance characteristic of the battery 1 which concerns on one Embodiment of this invention.

以下、本発明の一実施形態に係るバッテリ充電システムを、図面を用いて説明する。 Hereinafter, the battery charging system according to the embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態に係るバッテリ充電システムＡの概略構成の一例を示す図である。図１に示すように、バッテリ充電システムＡは、バッテリ１及びバッテリ充電装置２を備える。 FIG. 1 is a diagram showing an example of a schematic configuration of a battery charging system A according to an embodiment of the present invention. As shown in FIG. 1, the battery charging system A includes a battery 1 and a battery charging device 2.

バッテリ１は、ハイブリッド車や電気自動者等の車両に搭載されている。バッテリ１は、直列接続された複数の電池セル群１０を備える。 The battery 1 is mounted on a vehicle such as a hybrid vehicle or an electric automation person. The battery 1 includes a plurality of battery cell groups 10 connected in series.

各電池セル群１０には、複数の電池セルが直列接続されており、各電池セル群１０において、最上位に位置する電池セル（最上位セル）の正極端子が電池セル群１０の正極端子（一方の出力端子）であり、また最下位に位置する電池セル（最下位セル）の負極端子が電池セル群１０の負極端子（他方の出力端子）である。 A plurality of battery cells are connected in series to each battery cell group 10, and in each battery cell group 10, the positive electrode terminal of the battery cell (top cell) located at the highest position is the positive electrode terminal of the battery cell group 10. One output terminal), and the negative electrode terminal of the battery cell (lowermost cell) located at the lowest position is the negative electrode terminal (the other output terminal) of the battery cell group 10.

バッテリ充電装置２は、車載用のバッテリ１の充電を行うとともに、その充電によるバッテリ１の内部抵抗ＩＲの発熱によってバッテリ１を暖機する。
以下に、本発明の一実施形態に係るバッテリ充電装置２の構成について説明する。 The battery charging device 2 charges the vehicle-mounted battery 1 and warms the battery 1 by the heat generated by the internal resistance IR of the battery 1 due to the charging.
Hereinafter, the configuration of the battery charging device 2 according to the embodiment of the present invention will be described.

バッテリ充電装置２は、コンタクタ２１、コンタクタ２２、コネクタ２３、充電プラグ２４、制御部２５、予測気温取得部２６、及び外部充電器２７を備える。なお、本実施形態では、コンタクタ２１、コンタクタ２２、コネクタ２３及び制御部２５は、上記車両に搭載されている。 The battery charging device 2 includes a contactor 21, a contactor 22, a connector 23, a charging plug 24, a control unit 25, a predicted temperature acquisition unit 26, and an external charger 27. In this embodiment, the contactor 21, the contactor 22, the connector 23, and the control unit 25 are mounted on the vehicle.

コンタクタ２１は、第１の電力線Ｌ１に設けられ、制御部２５からの制御に応じて開状態あるいは閉状態に変化する一対の接点を備えた通電開閉器である。この第１の電力線Ｌ１は、一端がバッテリ１の正極端子に接続され、他端がコネクタ２３に接続されている。 The contactor 21 is an energization switch provided on the first power line L1 and provided with a pair of contacts that change to an open state or a closed state according to control from the control unit 25. One end of the first power line L1 is connected to the positive electrode terminal of the battery 1, and the other end is connected to the connector 23.

コンタクタ２２は、第２の電力線Ｌ２に設けられ、上記コンタクタ２１と同様に制御部２５からの制御に応じて開状態あるいは閉状態に変化する一対の接点を備えた通電開閉器である。この第２の電力線Ｌ２は、一端がバッテリ１の負極端子に接続され、他端がコネクタ２３に接続されている。 The contactor 22 is an energization switch provided on the second power line L2 and provided with a pair of contacts that change to an open state or a closed state according to the control from the control unit 25 like the contactor 21. One end of the second power line L2 is connected to the negative electrode terminal of the battery 1, and the other end is connected to the connector 23.

コネクタ２３は、車両に設けられており、バッテリ１を外部充電器２７に接続するための接続手段である。 The connector 23 is provided on the vehicle and is a connecting means for connecting the battery 1 to the external charger 27.

充電プラグ２４は、外部充電器２７の充電プラグであって、コネクタ２３と結合することにより、外部充電器２７とバッテリ１とを電気的に接続することができる。これにより、第１の電力線Ｌ１と第２の電力線Ｌ２とのそれぞれの他端が外部充電器２７の出力に電気的に接続され、外部充電器２７によるバッテリ１の外部充電が可能な状態となる。また、コネクタ２３が充電プラグ２４に結合された場合には、制御部２５は、外部充電器２７と通信線Ｌ３を介して通信可能となる。 The charging plug 24 is a charging plug of the external charger 27, and by connecting to the connector 23, the external charger 27 and the battery 1 can be electrically connected. As a result, the other ends of the first power line L1 and the second power line L2 are electrically connected to the output of the external charger 27, and the battery 1 can be externally charged by the external charger 27. .. Further, when the connector 23 is coupled to the charging plug 24, the control unit 25 can communicate with the external charger 27 via the communication line L3.

制御部２５は、バッテリ１の各電池セル群１０の電圧をモニタしながら、バッテリ１の充放電等の管理を行う、例えば、バッテリーマネージメントシステム（ＢＭＳ）である。以下に、本発明の一実施形態に係る制御部２５の構成について説明する。 The control unit 25 is, for example, a battery management system (BMS) that manages charging / discharging of the battery 1 while monitoring the voltage of each battery cell group 10 of the battery 1. Hereinafter, the configuration of the control unit 25 according to the embodiment of the present invention will be described.

制御部２５は、記憶部２５１及び内部抵抗値算出部２５２を備える。 The control unit 25 includes a storage unit 251 and an internal resistance value calculation unit 252.

記憶部２５１には、バッテリ１の劣化に応じて変化する内部抵抗ＩＲの抵抗値（以下、「内部抵抗値」という。）ＲＶの情報が予め格納されている。 Information on the resistance value (hereinafter, referred to as “internal resistance value”) RV of the internal resistance IR, which changes according to the deterioration of the battery 1, is stored in the storage unit 251 in advance.

図２は、記憶部２５１に格納される情報の一例をテーブル形式で示す。記憶部２５１には、バッテリ１の劣化に応じて変化する内部抵抗値ＲＶの情報として、バッテリ１の経過年数によって変化する内部抵抗値ＲＶの情報が格納される経年劣化テーブルやバッテリ１の使用回数によって変化する内部抵抗値ＲＶの情報が格納される使用回数テーブルが設けられている。 FIG. 2 shows an example of information stored in the storage unit 251 in a table format. The storage unit 251 stores the information of the internal resistance value RV that changes according to the elapsed years of the battery 1 as the information of the internal resistance value RV that changes according to the deterioration of the battery 1 or the aged deterioration table of the battery 1. A usage count table is provided in which information on the internal resistance value RV , which changes depending on the usage count, is stored.

図２（ａ）は、経年劣化テーブルに格納される情報の一例を示す。経年劣化テーブルには、経過年数と、その経過年数でのバッテリ１の内部抵抗値ＲＶの各情報が対応付けられて格納される。例えば、経過年数は、バッテリ１が使用されてから経過した年数、月数、又は日数を示す情報である。 FIG. 2A shows an example of information stored in the aging table. In the aged deterioration table, each information of the elapsed years and the internal resistance value RV of the battery 1 in the elapsed years is stored in association with each other. For example, the elapsed years is information indicating the number of years, months, or days that have passed since the battery 1 was used.

図２（ｂ）は、使用回数テーブルに格納される情報の一例を示す。使用回数テーブルには、バッテリ１の使用回数と、その使用回数でのバッテリ１の内部抵抗値ＲＶの各情報が対応付けられて格納される。なお、使用回数とは、バッテリ１の充放電の回数であってもよいし、車両の電源スイッチのオンオフのカウント数であってもよい。この電源スイッチの電源とは、アクセサリー電源であってもよいし、イグニッション電源であってもよい。 FIG. 2B shows an example of information stored in the usage count table. In the usage count table, each information of the usage count of the battery 1 and the internal resistance value RV of the battery 1 according to the usage count is stored in association with each other. The number of uses may be the number of times the battery 1 is charged and discharged, or the number of times the power switch of the vehicle is turned on and off. The power source of this power switch may be an accessory power source or an ignition power source.

内部抵抗値算出部２５２は、現在のバッテリ１の内部抵抗値Ｒｖを算出する。例えば、内部抵抗値算出部２５２は、バッテリ１の経過年数、及びバッテリ１の使用回数の少なくともいずれかによって、現在のバッテリ１の内部抵抗値ＲＶを算出する。より具体的には、例えば、内部抵抗値算出部２５２は、バッテリ１の経過年数をパラメータとして、その経過年数に対応する内部抵抗値Ｒｖを経年劣化テーブルから読み取ることで取得する。なお、内部抵抗値算出部２５２は、バッテリ１の使用回数をパラメータとして、その使用回数に対応する内部抵抗値ＲＶを使用回数テーブルから読み取ることで取得してもよい。 The internal resistance value calculation unit 252 calculates the internal resistance value Rv of the current battery 1. For example, the internal resistance value calculation unit 252 calculates the current internal resistance value RV of the battery 1 based on at least one of the elapsed years of the battery 1 and the number of times the battery 1 has been used. More specifically, for example, the internal resistance value calculation unit 252 obtains the internal resistance value Rv corresponding to the elapsed years by using the elapsed years of the battery 1 as a parameter by reading from the aged deterioration table. The internal resistance value calculation unit 252 may obtain the internal resistance value RV corresponding to the number of times of use of the battery 1 by reading it from the number of times of use table, with the number of times of use of the battery 1 as a parameter.

内部抵抗値算出部２５２は、取得した内部抵抗値Ｒｖを、通信線Ｌ３を介して外部充電器２７に送信する。 The internal resistance value calculation unit 252 transmits the acquired internal resistance value Rv to the external charger 27 via the communication line L3.

予測気温取得部２６は、バッテリ１の充電を行う時間帯におけるバッテリ１の周囲の気温の予測値（以下、「予測気温」）Ｔｆを事前に取得する。例えば、予測気温取得部２６は、無線又は有線によりインターネット等のネットワークに接続し、気象庁や気象協会などが行った気象予報などにより求められた予測気温を取得することができる。 The predicted temperature acquisition unit 26 acquires in advance a predicted value (hereinafter, “predicted temperature”) Tf of the temperature around the battery 1 in the time zone in which the battery 1 is charged. For example, the predicted temperature acquisition unit 26 can connect to a network such as the Internet wirelessly or by wire and acquire the predicted temperature obtained by a weather forecast made by the Japan Meteorological Agency, the Meteorological Association, or the like.

したがって、例えば、予測気温取得部２６は、バッテリ１の周囲（例えば、車両の位置情報）の位置情報がユーザにより入力されると、その位置におけるバッテリ１の充電を行う時間帯の予測気温Ｔｆを気象庁のウェブサイトから取得する。そして、予測気温取得部２６は、取得した予測気温Ｔｆを外部充電器２７に有線又は無線で送信する。 Therefore, for example, when the position information around the battery 1 (for example, the position information of the vehicle) is input by the user, the predicted temperature acquisition unit 26 sets the predicted temperature Tf in the time zone for charging the battery 1 at that position. Obtained from the Japan Meteorological Agency website. Then, the predicted temperature acquisition unit 26 transmits the acquired predicted temperature Tf to the external charger 27 by wire or wirelessly.

外部充電器２７は、バッテリ１を車両外部から定電流充電（外部充電）する装置や設備であり、例えば、商業施設、駐車場などに設置される充電スタンドや、可搬可能な電源である。 The external charger 27 is a device or equipment for constant current charging (external charging) of the battery 1 from the outside of the vehicle, for example, a charging stand installed in a commercial facility, a parking lot, or the like, or a portable power source.

以下に、本発明の一実施形態に係る外部充電器２７の構成について、図３を用いて説明する。図３は、本発明の一実施形態に係る外部充電器２７の構成図である。 Hereinafter, the configuration of the external charger 27 according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 is a configuration diagram of an external charger 27 according to an embodiment of the present invention.

図３に示すように、外部充電器２７は、充電計画作成部２７１及び充電制御部２７２を備える。 As shown in FIG. 3, the external charger 27 includes a charging plan creating unit 271 and a charging control unit 272.

充電計画作成部２７１は、バッテリ１の使用開始時刻（以下、単に「使用開始時刻」という。）にバッテリ１が所定温度Ｔｔｈ以上になるようなバッテリ１の充電計画を作成する。その際に、充電計画作成部２７１は、バッテリ１の劣化に応じて変化する内部抵抗値Ｒｖをパラメータとして充電計画を作成する。以下に、本発明の一実施形態に係る充電計画の作成方法を説明する。 The charge plan creation unit 271 creates a charge plan for the battery 1 so that the battery 1 becomes at least a predetermined temperature T th at the start time of use of the battery 1 (hereinafter, simply referred to as “use start time”). At that time, the charge plan creation unit 271 creates a charge plan with the internal resistance value Rv, which changes according to the deterioration of the battery 1, as a parameter. Hereinafter, a method for creating a charging plan according to an embodiment of the present invention will be described.

充電計画作成部２７１は、使用開始時刻及び所定温度Ｔｔｈの情報を取得する。例えば、充電計画作成部２７１は、使用開始時刻及び所定温度Ｔｔｈの情報がユーザにより入力されることで取得する。また、充電計画作成部２７１は、予測気温取得部２６から予測気温Ｔｆを取得する。 The charge plan creation unit 271 acquires information on the use start time and the predetermined temperature Tth . For example, the charging plan creation unit 271 acquires the information of the use start time and the predetermined temperature Tth by inputting the information by the user. Further, the charging plan creation unit 271 acquires the predicted air temperature Tf from the predicted air temperature acquisition unit 26.

ここで、予測気温Ｔｆは、バッテリ１を外部充電する時間帯のバッテリ１の温度とみなせる。そのため、充電計画作成部２７１は、予測気温Ｔｆから所定温度Ｔｔｈにバッテリ１を温度上昇させるために必要な熱量を定電流充電により発生させる充電計画を作成することになる。 Here, the predicted air temperature Tf can be regarded as the temperature of the battery 1 in the time zone for externally charging the battery 1. Therefore, the charge plan creation unit 271 creates a charge plan for generating the amount of heat required to raise the temperature of the battery 1 from the predicted temperature Tf to a predetermined temperature Tth by constant current charging.

例えば、充電計画作成部２７１は、バッテリ１に対する定電流充電の充電損失Ｐを求める。具体的には、充電計画作成部２７１は、内部抵抗値算出部２５２から内部抵抗値Ｒｖを取得し、この内部抵抗値Ｒｖと定電流充電における充電電流値Ｉｖとから下記の式（１）に基づいて充電損失Ｐを求める。 For example, the charge plan creation unit 271 obtains a charge loss P for constant current charging for the battery 1. Specifically, the charge plan creation unit 271 acquires the internal resistance value Rv from the internal resistance value calculation unit 252, and the internal resistance value Rv and the charge current value Iv in constant current charging are combined into the following equation (1). Based on this, the charge loss P is obtained.

Ｐ＝Ｉｖ×Ｉｖ×Ｒｖ …（１） P = Iv × Iv × Rv… (1)

そして、充電計画作成部２７１は、式（１）で求めた充電損失Ｐ及びバッテリ１の過渡熱抵抗特性から、バッテリ１の温度が予測気温Ｔｆから所定温度Ｔｔｈになるために必要な定電流充電の充電時間を求める。この過渡熱抵抗特性とは、充電時間による過渡熱抵抗の変化を示すものである。 Then, the charge plan creation unit 271 determines the constant current required for the temperature of the battery 1 to change from the predicted temperature Tf to the predetermined temperature Tth from the charge loss P obtained by the equation (1) and the transient heat resistance characteristics of the battery 1. Find the charging time for charging. This transient thermal resistance characteristic indicates a change in transient thermal resistance with respect to the charging time.

図４は、本発明の一実施形態に係るバッテリ１の過渡熱抵抗特性を示す図である。図４の横軸が充電時間、縦軸が過渡熱抵抗Ｒｔｈであり、充電時間が長くなるにつれてバッテリ１の温度が上昇することがわかる。 FIG. 4 is a diagram showing transient thermal resistance characteristics of the battery 1 according to the embodiment of the present invention. It can be seen that the horizontal axis of FIG. 4 is the charging time and the vertical axis is the transient thermal resistance Rth, and the temperature of the battery 1 rises as the charging time becomes longer.

したがって、充電計画作成部２７１は、図４に示すバッテリ１の過渡熱抵抗特性の過渡熱抵抗Ｒｔｈと、式（１）で求めた充電損失Ｐとを下記式（２）に代入し、どのくらいの充電時間で予測気温Ｔｆから所定温度Ｔｔｈになるかを算出する。すなわち、充電計画作成部２７１は、式（２）により温度上昇ΔＴが（Ｔｔｈ－Ｔｆ）となる充電時間をバッテリ１の過渡熱抵抗特性から求める。 Therefore, the charge plan creation unit 271 substitutes the transient thermal resistance Rth of the transient thermal resistance characteristic of the battery 1 shown in FIG. 4 and the charge loss P obtained by the equation (1) into the following equation (2), and how much. It is calculated from the predicted temperature Tf whether the predetermined temperature Tth is reached by the charging time. That is, the charge plan creation unit 271 obtains the charge time at which the temperature rise ΔT becomes ( Thth − Tf) from the transient thermal resistance characteristic of the battery 1 according to the equation (2).

ΔＴ＝Ｐ×Ｒｔｈ …（２） ΔT = P × Rth… (2)

そして、充電計画作成部２７１は、求めた充電時間分だけ使用開始時刻から前倒しで定電流充電する充電計画を作成する。 Then, the charging plan creating unit 271 creates a charging plan for charging a constant current ahead of schedule from the start time of use for the obtained charging time.

このように、充電計画作成部２７１は、内部抵抗値Ｒｖ、充電電流値Ｉｖ、及び予測気温Ｔｆをパラメータとして充電計画を作成する。 In this way, the charge plan creation unit 271 creates a charge plan with the internal resistance value Rv, the charge current value Iv, and the predicted temperature Tf as parameters.

充電制御部２７２は、充電計画作成部２７１が作成した充電計画に従って、バッテリ１を定電流充電する。 The charge control unit 272 charges the battery 1 with a constant current according to the charge plan created by the charge plan creation unit 271.

以下に、本発明の一実施形態に係るバッテリ充電装置の動作について説明する。
例えば、外部充電器２７に対して、使用開始時刻が翌日の午前６時に設定され、所定温度Ｔｔｈが１５℃に設定されたとする。この場合には、充電計画作成部２７１は、予測気温取得部２６から、例えば、翌日の午前６時の予測気温を取得する。ここで、翌日の午前６時の予測気温Ｔｆが５℃である場合には、充電計画作成部２７１は、バッテリ１をΔＴ＝１０℃（＝Ｔｔｈ－Ｔｆ）温度上昇させて、翌日の午前６時にバッテリ１が１５℃（Ｔｔｈ）になるような充電計画を作成することになる。 The operation of the battery charging device according to the embodiment of the present invention will be described below.
For example, it is assumed that the use start time is set to 6 am the next day and the predetermined temperature Tth is set to 15 ° C. for the external charger 27. In this case, the charging plan creation unit 271 acquires, for example, the predicted temperature at 6:00 am on the next day from the predicted temperature acquisition unit 26. Here, when the predicted temperature Tf at 6:00 am on the next day is 5 ° C., the charge planning unit 271 raises the temperature of the battery 1 by ΔT = 10 ° C. (= T th − Tf), and the next morning. A charging plan will be created so that the battery 1 will reach 15 ° C ( Th ) at 6 o'clock.

まず、充電計画作成部２７１は、内部抵抗値Ｒｖを内部抵抗値算出部２５２から取得する。そして、充電計画作成部２７１は、バッテリ１に対する定電流充電の充電損失Ｐを求める。ここで、バッテリ１に対する定電流充電の充電電流値が１Ａ、内部抵抗値Ｒｖが１０ｍΩとすると、充電損失Ｐ＝１Ｗとなる。 First, the charge plan creation unit 271 acquires the internal resistance value Rv from the internal resistance value calculation unit 252. Then, the charge plan creation unit 271 obtains the charge loss P of the constant current charge for the battery 1. Here, assuming that the charging current value of constant current charging for the battery 1 is 1A and the internal resistance value Rv is 10mΩ, the charging loss P = 1W.

次に、充電計画作成部２７１は、充電損失Ｐ及び図４の過渡熱抵抗特性の過渡熱抵抗Ｒｔｈからバッテリ１の温度上昇がΔＴ＝１０℃となる充電時間を算出する。 Next, the charge plan creation unit 271 calculates the charge time at which the temperature rise of the battery 1 becomes ΔT = 10 ° C. from the charge loss P and the transient thermal resistance Rth of the transient thermal resistance characteristic of FIG.

例えば、図４の過渡熱抵抗特性より、充電時間が１ｈである場合にはバッテリ１の過渡熱抵抗Ｒｔｈが６℃／Ｗとなる。したがって、式（２）から充電時間が１ｈである場合には、バッテリ１の温度上昇ΔＴが６℃（＝１Ｗ×６℃／Ｗ）となる。すなわち、定電流充電を１ｈ行った場合には、バッテリ１が１１℃までしか昇温されず、バッテリ１の温度が所定温度Ｔｔｈ＝１５℃には到達しないことになる。 For example, from the transient thermal resistance characteristic of FIG. 4, when the charging time is 1h, the transient thermal resistance Rth of the battery 1 is 6 ° C./W. Therefore, when the charging time is 1 h from the equation (2), the temperature rise ΔT of the battery 1 is 6 ° C. (= 1 W × 6 ° C./W). That is, when constant current charging is performed for 1 hour, the temperature of the battery 1 is raised only up to 11 ° C., and the temperature of the battery 1 does not reach the predetermined temperature Th = 15 ° C.

一方、充電時間が３ｈである場合にはバッテリ１の過渡熱抵抗Ｒｔｈが１０℃／Ｗとなる。したがって、式（２）から充電時間が３ｈである場合には、バッテリ１の温度上昇ΔＴが１０℃（＝１Ｗ×１０℃／Ｗ）となる。すなわち、定電流充電を３ｈ行った場合には、バッテリ１が１５℃まで昇温され、バッテリ１の温度が所定温度Ｔｔｈ＝１５℃に到達することがわかる。 On the other hand, when the charging time is 3 hours, the transient thermal resistance Rth of the battery 1 is 10 ° C./W. Therefore, when the charging time is 3 hours from the equation (2), the temperature rise ΔT of the battery 1 is 10 ° C. (= 1W × 10 ° C./W). That is, it can be seen that when the constant current charging is performed for 3 hours, the temperature of the battery 1 is raised to 15 ° C., and the temperature of the battery 1 reaches a predetermined temperature Th = 15 ° C.

したがって、充電計画作成部２７１は、使用開始時刻の３時間前である翌日の午前３時に充電電流値Ｉｖの定電流充電を開始する充電計画を作成する。そして、充電制御部２７２は、充電計画作成部２７１が作成した充電計画に従って、翌日の午前３時から午前６時まで充電電流値Ｉｖの定電流充電を行う。これにより、バッテリ１が所望のＳＯＣ（State Of Charge：充電状態）まで充電されるとともに、使用開始時刻にバッテリの温度が所定温度Ｔｔｈになるように暖機することができる。 Therefore, the charge plan creation unit 271 creates a charge plan for starting constant current charging with a charge current value Iv at 3:00 am the next day, which is 3 hours before the start time of use. Then, the charge control unit 272 performs constant current charging with a charge current value Iv from 3:00 am to 6:00 am the next day according to the charge plan created by the charge plan creation unit 271. As a result, the battery 1 can be charged to a desired SOC (State Of Charge), and can be warmed up so that the temperature of the battery reaches a predetermined temperature Tth at the start time of use.

以上、この発明の実施形態について図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計等も含まれる。 Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention.

（変形例１）
上記実施形態では、充電計画作成部２７１は、バッテリ１の劣化に応じて変化する内部抵抗値Ｒｖをパラメータとして定電流充電を開始する時間を設定し、その設定した時間を含む充電計画を作成したが、本発明はこれに限定されない。 (Modification 1)
In the above embodiment, the charging plan creating unit 271 sets a time for starting constant current charging with an internal resistance value Rv that changes according to deterioration of the battery 1 as a parameter, and creates a charging plan including the set time. However, the present invention is not limited to this.

例えば、充電計画作成部２７１は、バッテリ１の劣化に応じて変化する内部抵抗値Ｒｖをパラメータとして定電流充電の充電電流値Ｉｖを設定し、その設定した充電電流値Ｉｖを含む充電計画を作成してもよい。例えば、定電流充電を開始する時間が予め設定されている場合には、充電計画作成部２７１は、使用開始時刻を用いて充電時間を算出し、その充電時間で予測気温Ｔｆから所定温度Ｔｔｈにバッテリ１を温度上昇させるために必要な充電電流値Ｉｖを、内部抵抗値Ｒｖ及び過渡熱抵抗特性から求める。 For example, the charge plan creation unit 271 sets the charge current value Iv for constant current charging with the internal resistance value Rv that changes according to the deterioration of the battery 1 as a parameter, and creates a charge plan including the set charge current value Iv. You may. For example, when the time to start constant current charging is preset, the charge plan creation unit 271 calculates the charge time using the use start time, and the predetermined temperature Tth is calculated from the predicted temperature Tf based on the charge time. The charging current value Iv required to raise the temperature of the battery 1 is obtained from the internal resistance value Rv and the transient thermal resistance characteristic.

実施例として、使用開始時刻が翌日の午前６時に設定され、定電流充電の開始時刻が午前５時に設定された場合には、充電時間が１ｈであると設定される。また、所定温度Ｔｔｈが１５℃に設定され、予測気温Ｔｆが９℃であったとすると、バッテリ１の温度上昇ΔＴが６℃に設定される。 As an embodiment, when the use start time is set at 6 am on the next day and the constant current charging start time is set at 5 am, the charging time is set to 1 h. Further, assuming that the predetermined temperature T th is set to 15 ° C. and the predicted temperature Tf is 9 ° C., the temperature rise ΔT of the battery 1 is set to 6 ° C.

この場合には、充電計画作成部２７１は、充電時間が１ｈであるときの過渡熱抵抗Ｒｔｈ（＝６℃／Ｗ）を図４の過渡熱抵抗特性から読み取り、その過渡熱抵抗Ｒｔｈ（＝６℃／Ｗ）と、バッテリ１の温度上昇ΔＴ（＝６℃）とから式（２）を用いて、充電損失Ｐ（＝１Ｗ）を算出する。そして、内部抵抗値Ｒｖが１０ｍΩであるとした場合には、充電計画作成部２７１は、算出した充電損失Ｐ（＝１Ｗ）と内部抵抗値Ｒｖ（＝１０ｍΩ）とから式（１）を用いて、充電電流値Ｉｖ（＝１Ａ）を算出する。したがって、充電計画作成部２７１は、充電電流値を１Ａとして、翌日の午前５時から午前６時までの間に定電流充電を開始するという充電計画を作成する。 In this case, the charging plan creation unit 271 reads the transient thermal resistance Rth (= 6 ° C./W) when the charging time is 1h from the transient thermal resistance characteristic of FIG. 4, and the transient thermal resistance Rth (= 6). The charge loss P (= 1W) is calculated using the equation (2) from the ° C./W) and the temperature rise ΔT (= 6 ° C.) of the battery 1. Then, assuming that the internal resistance value Rv is 10 mΩ, the charge plan creating unit 271 uses the equation (1) from the calculated charge loss P (= 1 W) and the internal resistance value Rv (= 10 mΩ). , The charge current value Iv (= 1A) is calculated. Therefore, the charge plan creation unit 271 creates a charge plan in which the charge current value is set to 1 A and constant current charging is started between 5 am and 6 am the next day.

ここで、充電電流値Ｉｖは、バッテリ１の劣化によって内部抵抗値Ｒｖが上昇するに従って小さくなるように設定される。これにより、バッテリ充電装置２は、内部抵抗値が小さいため発熱しにくい新品又は新品に近いバッテリ１に対しても、最適な充電計画を作成することができる。すなわち、バッテリ充電装置２は、バッテリ１が新品に近いほど充電電流値Ｉｖを大きくすることで昇温を促進し、短時間昇温を実現することができる。したがって、長期にわたって最適な充電計画を作成できる。 Here, the charging current value Iv is set so as to decrease as the internal resistance value Rv increases due to deterioration of the battery 1. As a result, the battery charging device 2 can create an optimum charging plan even for a new or near-new battery 1 that does not easily generate heat because the internal resistance value is small. That is, the battery charging device 2 can promote the temperature rise by increasing the charging current value Iv as the battery 1 is closer to a new product, and can realize the temperature rise in a short time. Therefore, it is possible to create an optimum charging plan over a long period of time.

（変形例２）
上記実施形態では、充電計画作成部２７１は、内部抵抗値算出部２５２により算出された内部抵抗値Ｒｖを用いて充電計画を作成したが、本発明はこれに限定されない。例えば、バッテリ充電装置２は、内部抵抗値Ｒｖを測定する内部抵抗値測定部を備えてもよい。そして、充電計画作成部２７１は、その内部抵抗値測定部で測定された内部抵抗値Ｒｖを用いて充電計画を作成してもよい。 (Modification 2)
In the above embodiment, the charging plan creating unit 271 creates a charging plan using the internal resistance value Rv calculated by the internal resistance value calculating unit 252, but the present invention is not limited to this. For example, the battery charging device 2 may include an internal resistance value measuring unit that measures the internal resistance value Rv. Then, the charging plan creating unit 271 may create a charging plan using the internal resistance value Rv measured by the internal resistance value measuring unit.

（変形例３）
上記実施形態において、予測気温取得部２６は、外部充電器２７に設けられてもよいし、車両に設けられてもよい。また、充電計画作成部２７１の機能を、制御部２５に設けてもよい。この場合には、予測気温取得部２６は、予測気温Ｔｆを制御部２５に送信する。そして、制御部２５は、上記実施形態において説明した方法で充電計画を作成して通信回線Ｌ３を介して外部充電器２７に送信する。これにより、外部充電器２７は、制御部２５が作成した充電計画に従って、バッテリ１に対する定電流充電を開始する。 (Modification 3)
In the above embodiment, the predicted temperature acquisition unit 26 may be provided on the external charger 27 or may be provided on the vehicle. Further, the function of the charge plan creation unit 271 may be provided in the control unit 25. In this case, the predicted temperature acquisition unit 26 transmits the predicted temperature Tf to the control unit 25. Then, the control unit 25 creates a charging plan by the method described in the above embodiment and transmits it to the external charger 27 via the communication line L3. As a result, the external charger 27 starts constant current charging to the battery 1 according to the charging plan created by the control unit 25.

（変形例４）
上記実施形態では、バッテリ充電装置２は、充電計画を作成するにあたって、バッテリ１のＳＯＣを考慮してもよい。例えば、制御部２５がバッテリ１のＳＯＣを算出し、外部充電器２７は、制御部２５により算出されたＳＯＣが使用開始時刻に目標値になるように充電計画を作成してもよい。すなわち、充電計画作成部２７１は、充電計画を作成するにあたって、制御部２５により算出されたＳＯＣが使用開始時刻に目標値になるという条件を追加して、充電計画を作成してもよい。 (Modification example 4)
In the above embodiment, the battery charging device 2 may consider the SOC of the battery 1 in creating the charging plan. For example, the control unit 25 may calculate the SOC of the battery 1, and the external charger 27 may create a charging plan so that the SOC calculated by the control unit 25 becomes the target value at the start time of use. That is, when creating the charging plan, the charging plan creating unit 271 may create the charging plan by adding the condition that the SOC calculated by the control unit 25 becomes the target value at the start time of use.

以上、説明したように、本実施形態に係るバッテリ充電装置２は、充電計画に従って車載用のバッテリ１の充電を行うとともに、当該充電によるバッテリ１の内部抵抗ＲＩの発熱によってバッテリ１を暖機するものであって、バッテリ１の劣化に応じて変化する内部抵抗値Ｒｖをパラメータとして充電計画を作成する充電計画作成部２７１を備える。 As described above, the battery charging device 2 according to the present embodiment charges the vehicle-mounted battery 1 according to the charging plan, and warms the battery 1 by the heat generated by the internal resistance RI of the battery 1 due to the charging. The battery 1 includes a charging plan creating unit 271 that creates a charging plan using an internal resistance value Rv that changes according to deterioration of the battery 1 as a parameter.

このような構成によれば、バッテリが劣化した場合であっても、最適な充電計画を作成することができる。 With such a configuration, it is possible to create an optimum charging plan even when the battery deteriorates.

また、充電計画作成部２７１は、バッテリ１の劣化に応じて変化する内部抵抗値Ｒｖと、定電流充電における充電電流値Ｉｖとをパラメータとして充電計画を作成する。そして、充電電流値Ｉｖは、内部抵抗値Ｒｖが上昇するに従って小さくなるように設定される。 Further, the charging plan creating unit 271 creates a charging plan with the internal resistance value Rv, which changes according to the deterioration of the battery 1, and the charging current value Iv in constant current charging as parameters. Then, the charging current value Iv is set so as to decrease as the internal resistance value Rv increases.

このような構成によれば、バッテリ充電装置２は、バッテリ１が新品に近いほど充電電流値Ｉｖを大きくすることで昇温を促進し、短時間昇温を実現することができる。したがって、長期にわたって最適な充電計画を作成できる。 According to such a configuration, the battery charging device 2 can promote the temperature rise by increasing the charging current value Iv as the battery 1 is closer to a new product, and can realize the temperature rise in a short time. Therefore, it is possible to create an optimum charging plan over a long period of time.

また、バッテリ充電装置２は、バッテリ１の充電を行う時間帯におけるバッテリ１の周囲の予測気温Ｔｆを事前に取得する予測気温取得部２６を備えてもよい。そして、充電計画作成部２７１は、バッテリ１の劣化に応じて変化する内部抵抗値Ｒｖ、定電流充電における充電電流値Ｉｖ、及び予測気温Ｔｆをパラメータとして充電計画を作成してもよい。 Further, the battery charging device 2 may include a predicted temperature acquisition unit 26 that acquires in advance the predicted temperature Tf around the battery 1 in the time zone in which the battery 1 is charged. Then, the charge plan creation unit 271 may create a charge plan using the internal resistance value Rv, which changes according to the deterioration of the battery 1, the charge current value Iv in constant current charging, and the predicted temperature Tf as parameters.

このような構成によれば、バッテリ経年劣化と、季節により変わる予測気温を考慮して常に最適な充電及び昇温計画を作成できる。例えば、季節により、冬は気温が低く昇温しにくく、夏は気温が高く昇温しやすい。したがって、バッテリ充電装置２は、例えば、インターネットにより予測気温Ｔｆを取得して充電計画に反映させることで季節を問わず最適な充電計画を作成できる。このときバッテリの経年劣化も考慮している為、長期にわたって常に最適な充電計画を作成できる。 With such a configuration, it is possible to always create an optimum charge and temperature rise plan in consideration of the aging of the battery and the predicted temperature that changes depending on the season. For example, depending on the season, the temperature is low in winter and it is difficult to raise the temperature, and in summer the temperature is high and it is easy to raise the temperature. Therefore, the battery charging device 2 can create an optimum charging plan regardless of the season by acquiring the predicted temperature Tf via the Internet and reflecting it in the charging plan, for example. At this time, since the aged deterioration of the battery is also taken into consideration, the optimum charging plan can always be created for a long period of time.

Ａ バッテリ充電システム
１ バッテリ
２ バッテリ充電装置
２６ 予測気温取得部
２７ 外部充電器
２５２ 内部抵抗値算出部
２７１ 充電計画作成部
２７２ 充電制御部 A Battery charging system 1 Battery 2 Battery charging device 26 Predicted temperature acquisition unit 27 External charger 252 Internal resistance value calculation unit 271 Charging plan creation unit 272 Charging control unit

Claims (4)

車載用のバッテリの充電を行うとともに、前記充電による前記バッテリの内部抵抗の発熱によって当該バッテリを暖機するバッテリ充電装置であって、
前記バッテリの使用開始時刻に前記バッテリが所定温度以上になるような前記バッテリの充電計画を作成する充電計画作成部と、
前記充電計画に従って前記バッテリを定電流充電する充電制御部と、
を備え、
前記充電計画作成部は、前記バッテリの劣化に応じて変化する前記バッテリの内部抵抗値と、前記定電流充電における充電電流値とをパラメータとして前記充電計画を作成し、
前記充電電流値は、前記内部抵抗値が上昇するに従って小さくなるように設定されることを特徴とする、
バッテリ充電装置。 A battery charging device that charges a vehicle-mounted battery and warms the battery by generating heat from the internal resistance of the battery due to the charging.
A charging plan creating unit that creates a charging plan for the battery so that the battery reaches a predetermined temperature or higher at the start time of use of the battery.
A charge control unit that charges the battery with a constant current according to the charge plan,
Equipped with
The charging plan creating unit creates the charging plan with the internal resistance value of the battery, which changes according to the deterioration of the battery, and the charging current value in the constant current charging as parameters.
The charging current value is set so as to decrease as the internal resistance value increases.
Battery charger. 前記バッテリの充電を行う時間帯における前記バッテリの周囲の予測気温を事前に取得する予測気温取得部を更に備え、
前記充電計画作成部は、前記バッテリの劣化に応じて変化する前記内部抵抗値、前記定電流充電における前記充電電流値、及び前記予測気温取得部により事前に取得された前記予測気温をパラメータとして前記充電計画を作成することを特徴とする、請求項１に記載のバッテリ充電装置。 Further provided with a predicted temperature acquisition unit that acquires in advance the predicted temperature around the battery during the time period for charging the battery.
The charging plan creating unit may use the internal resistance value that changes according to the deterioration of the battery, the charging current value in the constant current charging, and the predicted temperature previously acquired by the predicted temperature acquisition unit as parameters. The battery charging device according to claim 1 , wherein a charging plan is created. 前記バッテリの経年、及びバッテリの使用回数の少なくともいずれかによって前記内部抵抗値を算出する内部抵抗値算出部を更に備え、
前記充電計画作成部は、前記内部抵抗値算出部により算出された前記内部抵抗値を用いて前記充電計画を作成することを特徴とする、請求項１又は２に記載のバッテリ充電装置。 Further provided with an internal resistance value calculation unit that calculates the internal resistance value according to at least one of the aging of the battery and the number of times the battery has been used.
The battery charging device according to claim 1 or 2 , wherein the charging plan creating unit creates the charging plan using the internal resistance value calculated by the internal resistance value calculating unit. 前記内部抵抗値を測定する内部抵抗値測定部を更に備え、
前記充電計画作成部は、前記内部抵抗値測定部により測定された前記内部抵抗値を用いて、前記充電計画を作成することを特徴とする、請求項１又は２に記載のバッテリ充電装置。 Further equipped with an internal resistance value measuring unit for measuring the internal resistance value,
The battery charging device according to claim 1 or 2, wherein the charging plan creating unit creates the charging plan using the internal resistance value measured by the internal resistance value measuring unit.
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