JP7236984B2 - Battery management device and battery management method - Google Patents

Battery management device and battery management method Download PDF

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JP7236984B2
JP7236984B2 JP2019206485A JP2019206485A JP7236984B2 JP 7236984 B2 JP7236984 B2 JP 7236984B2 JP 2019206485 A JP2019206485 A JP 2019206485A JP 2019206485 A JP2019206485 A JP 2019206485A JP 7236984 B2 JP7236984 B2 JP 7236984B2
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battery
auxiliary battery
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turned
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JP2021083157A (en
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一人 六本木
秀幸 千阪
耕司 鉾井
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Denso Ten Ltd
Toyota Motor 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
    • 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
    • Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12—Remote or cooperative charging

Description

開示の実施形態は、バッテリ管理装置およびバッテリ管理方法に関する。 The disclosed embodiments relate to battery management devices and battery management methods.

従来、メインバッテリと補機バッテリとを備え、駐車中に補機バッテリの蓄電量を監視し、補機バッテリの蓄電量が低下した場合に、メインバッテリから補機バッテリへ汲み出し充電を行い、バッテリ上がりを防止する車両がある（例えば、特許文献１参照）。 Conventionally, a main battery and an auxiliary battery are provided, and the amount of electricity stored in the auxiliary battery is monitored while the vehicle is parked. There are vehicles that prevent climbing (see, for example, Patent Literature 1).

特開２０１４－１４０２６８号公報JP 2014-140268 A

しかしながら、車両は、駐車中に補機バッテリの蓄電量を監視すると、駐車中の車両の消費電力が増大する。 However, if the vehicle monitors the charge amount of the auxiliary battery while the vehicle is parked, power consumption of the parked vehicle increases.

実施形態の一態様は、上記に鑑みてなされたものであって、駐車中の車両の消費電力を増大させることなく、補機バッテリのバッテリ上がりを防止することができるバッテリ管理装置およびバッテリ管理方法を提供することを目的とする。 One aspect of the embodiments has been made in view of the above, and is a battery management device and a battery management method capable of preventing a dead auxiliary battery without increasing the power consumption of a parked vehicle. intended to provide

実施形態の一態様に係るバッテリ管理装置は、取得部と、判定部と、記憶部と、指令部とを備える。取得部は、メインバッテリと補機バッテリとを備える車両の電源がオフされた時点およびオンされた時点の前記補機バッテリの電圧を前記車両から受信して取得する。判定部は、前記取得部によって取得される前記電圧に基づいて前記バッテリの状態を判定する。記憶部は、前記判定部によって判定される前記補機バッテリの状態を記憶する。指令部は、前記車両の電源がオフされている期間に、前記記憶部によって記憶された前記補機バッテリの状態に基づいて、前記メインバッテリから前記補機バッテリへ充電させる指令を前記車両へ送信する。 A battery management device according to an aspect of an embodiment includes an acquisition unit, a determination unit, a storage unit, and a command unit. The acquiring unit receives and acquires voltages of the auxiliary battery from the vehicle when the power of the vehicle including the main battery and the auxiliary battery is turned off and when the power is turned on. A determination unit determines the state of the battery based on the voltage acquired by the acquisition unit. The storage unit stores the state of the auxiliary battery determined by the determination unit. The command unit transmits to the vehicle a command to charge the auxiliary battery from the main battery based on the state of the auxiliary battery stored by the storage unit while the vehicle is powered off. do.

実施形態の一態様に係るバッテリ管理装置およびバッテリ管理方法は、駐車中の車両の消費電力を増大させることなく、補機バッテリのバッテリ上がりを防止することができるという効果を奏する。 A battery management device and a battery management method according to an aspect of an embodiment have the effect of being able to prevent an auxiliary battery from running out without increasing the power consumption of a parked vehicle.

図１は、実施形態に係るバッテリ管理方法の概要を示す説明図である。FIG. 1 is an explanatory diagram showing an overview of the battery management method according to the embodiment. 図２は、実施形態に係るバッテリ管理装置の構成の一例を示すブロック図である。FIG. 2 is a block diagram showing an example of the configuration of the battery management device according to the embodiment. 図３は、実施形態に係るバッテリ管理装置の動作説明図である。FIG. 3 is an operation explanatory diagram of the battery management device according to the embodiment. 図４は、実施形態に係るバッテリ管理装置の動作説明図である。FIG. 4 is an operation explanatory diagram of the battery management device according to the embodiment. 図５は、実施形態に係るバッテリ管理装置の動作説明図である。FIG. 5 is an operation explanatory diagram of the battery management device according to the embodiment. 図６は、実施形態に係るバッテリ管理装置の動作説明図である。FIG. 6 is an operation explanatory diagram of the battery management device according to the embodiment. 図７は、実施形態に係るバッテリ管理装置の動作説明図である。FIG. 7 is an operation explanatory diagram of the battery management device according to the embodiment. 図８は、実施形態に係るバッテリ管理装置の制御部が実行する処理の一例を示すフローチャートである。8 is a flowchart illustrating an example of processing executed by a control unit of the battery management device according to the embodiment; FIG.

以下、添付図面を参照して、バッテリ管理装置およびバッテリ管理方法の実施形態を詳細に説明する。なお、以下に示す実施形態によりこの発明が限定されるものではない。図１は、実施形態に係るバッテリ管理方法の概要を示す説明図である。図１に示すように、実施形態に係るバッテリ管理装置１は、無線通信ネットワークを介して車両１０と双方向通信可能に接続される。 Embodiments of a battery management device and a battery management method will be described in detail below with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below. FIG. 1 is an explanatory diagram showing an overview of the battery management method according to the embodiment. As shown in FIG. 1, a battery management device 1 according to the embodiment is connected to a vehicle 10 via a wireless communication network so as to be capable of two-way communication.

車両１０は、例えば、ＥＶ（Electric Vehicle）、ＨＶ（Hybrid Vehicle）、およびＰＨＥＶ（Plug-in Hybrid Vehicle）等であり、車両１０を走行させるモータへ電力を供給するメインバッテリと、補機へ電力を供給する補機バッテリとを備える。メインバッテリは、例えば、リチウムイオンバッテリまたはニッケル水素バッテリである。補機バッテリは、例えば、鉛バッテリである。 The vehicle 10 is, for example, an EV (Electric Vehicle), a HV (Hybrid Vehicle), or a PHEV (Plug-in Hybrid Vehicle). and an auxiliary battery that supplies the The main battery is, for example, a lithium ion battery or a nickel metal hydride battery. The auxiliary battery is, for example, a lead battery.

補機バッテリは、車両１０のＩＧ（イグニッションスイッチ）やスタートスイッチがオンされて電源がオンとなっている期間や車両１０の走行中には、メインバッテリやオルタネータ等によってフル充電の状態が保たれる。しかし、補機バッテリは、車両１０の駐車時間が長期化すると、バッテリ上がりが発生する。 The auxiliary battery is kept fully charged by the main battery, alternator, etc. during the period when the IG (ignition switch) or start switch of the vehicle 10 is turned on and the power is turned on, or while the vehicle 10 is running. be However, when the vehicle 10 is parked for a long period of time, the auxiliary battery runs out of battery.

このため、車両の駐車中に補機バッテリの蓄電量を監視し、蓄電量が低下した場合に、メインバッテリから補機バッテリへ汲み出し充電を行う車両があるが、かかる車両は、補機バッテリの監視にも電力を使用するため、駐車中の車両の消費電力が増大する。 For this reason, some vehicles monitor the amount of electricity stored in the auxiliary battery while the vehicle is parked, and when the amount of electricity stored decreases, the auxiliary battery is pumped from the main battery and charged. Since power is also used for monitoring, the power consumption of the parked vehicle increases.

そこで、バッテリ管理装置１は、車両１０の電源がオフされると（ステップＳ１）、その時点の補機バッテリの電圧を車両１０から受信して取得する（ステップＳ２）。その後、バッテリ管理装置１は、次に車両１０の電源がオンされると（ステップＳ３）、その時点の補機バッテリの電圧を車両１０から受信して取得する（ステップＳ４）。 Therefore, when the vehicle 10 is powered off (step S1), the battery management device 1 receives and acquires the voltage of the auxiliary battery at that time from the vehicle 10 (step S2). After that, when the power of the vehicle 10 is next turned on (step S3), the battery management device 1 receives and acquires the voltage of the auxiliary battery at that time from the vehicle 10 (step S4).

このとき、補機バッテリは、例えば、新品であれば、電源がオフされてから次にオンされるまでの間に、電圧の低下が殆んどないが、劣化している場合には、電圧が低下する。そこで、バッテリ管理装置１は、電源がオフされた時点およびオンされた時点の補機バッテリの電圧に基づいて、補機バッテリの状態を判定して記憶する（ステップＳ５）。 At this time, for example, if the auxiliary battery is new, there is almost no voltage drop between when the power is turned off and when it is turned on again. decreases. Therefore, the battery management device 1 determines and stores the state of the auxiliary battery based on the voltage of the auxiliary battery when the power is turned off and when the power is turned on (step S5).

そして、バッテリ管理装置１は、車両１０の駐車中に、記憶した補機バッテリの状態に基づいて、メインバッテリから補機バッテリへ充電させる指令（以下、「充電指令」と記載する）を車両１０へ送信する（ステップＳ６）。車両１０は、充電指令を受信すると、メインバッテリから補機バッテリへの充電を行う（ステップＳ７）。 Then, while the vehicle 10 is parked, the battery management device 1 issues a command to charge the auxiliary battery from the main battery (hereinafter referred to as "charging command") to the vehicle 10 based on the stored state of the auxiliary battery. (step S6). When the vehicle 10 receives the charge command, the vehicle 10 charges the auxiliary battery from the main battery (step S7).

これにより、バッテリ管理装置１は、車両１０の駐車時間が長期化しても、補機バッテリがバッテリ上がりになることを防止することができる。また、バッテリ管理装置１は、車両１０の電源がオンされた時点と、オフされた時点と、充電指令を送信する時点に限って車両１０と通信するので、通信に要する車両１０の消費電力を最低限に抑えることができる。しかも、車両１０は、駐車中に補機バッテリの充電量を監視する必要がないため、駐車中の消費電力を低減することができる。 As a result, the battery management device 1 can prevent the auxiliary battery from becoming dead even if the vehicle 10 is parked for a long period of time. In addition, since the battery management device 1 communicates with the vehicle 10 only when the power of the vehicle 10 is turned on, when it is turned off, and when the charging command is transmitted, the power consumption of the vehicle 10 required for communication can be reduced. can be minimized. Moreover, since the vehicle 10 does not need to monitor the charging amount of the auxiliary battery while the vehicle is parked, it is possible to reduce power consumption while the vehicle is parked.

次に、図２を参照してバッテリ管理装置１の構成について説明する。図２は、実施形態に係るバッテリ管理装置１の構成の一例を示すブロック図である。図２に示すように、バッテリ管理装置１は、例えば、インターネット等の通信ネットワーク１００を介して、複数の車両１０～１０－ｎと無線通信可能に接続される。 Next, the configuration of the battery management device 1 will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the configuration of the battery management device 1 according to the embodiment. As shown in FIG. 2, the battery management device 1 is wirelessly communicably connected to a plurality of vehicles 10 to 10-n via a communication network 100 such as the Internet.

バッテリ管理装置１は、通信部２と、記憶部３と、制御部４とを備える。通信部２は、通信ネットワーク１００を介して車両１０～１０－ｎと通信を行う通信インターフェースである。記憶部３は、例えば、データフラッシュ等の情報記憶デバイスであり、補機バッテリの状態情報３１を記憶する。 The battery management device 1 includes a communication section 2 , a storage section 3 and a control section 4 . The communication unit 2 is a communication interface that communicates with the vehicles 10 to 10-n via the communication network 100. FIG. The storage unit 3 is, for example, an information storage device such as a data flash, and stores state information 31 of the auxiliary battery.

制御部４は、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）などを有するマイクロコンピュータや各種の回路を含む。制御部４は、ＣＰＵがＲＯＭに記憶されたプログラムを、ＲＡＭを作業領域として使用して実行することにより機能する取得部４１と、判定部４２と、指令部４３とを備える。 The control unit 4 includes a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and various circuits. The control unit 4 includes an acquisition unit 41 , a determination unit 42 , and a command unit 43 which function when the CPU executes a program stored in the ROM using the RAM as a work area.

なお、制御部４が備える取得部４１、判定部４２、および指令部４３は、一部または全部がＡＳＩＣ（Application Specific Integrated Circuit）やＦＰＧＡ（Field Programmable Gate Array）等のハードウェアで構成されてもよい。 Note that the acquisition unit 41, the determination unit 42, and the command unit 43 included in the control unit 4 may be partially or entirely configured by hardware such as ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array). good.

制御部４が備える取得部４１、判定部４２、および指令部４３は、それぞれ以下に説明する情報処理の作用を実現または実行する。なお、制御部４の内部構成は、図２に示した構成に限られず、後述する情報処理を行う構成であれば他の構成であってもよい。 Acquisition unit 41 , determination unit 42 , and command unit 43 provided in control unit 4 implement or execute information processing operations described below. Note that the internal configuration of the control unit 4 is not limited to the configuration shown in FIG. 2, and may be another configuration as long as it performs the information processing described later.

取得部４１は、例えば、車両１０の電源がオフされた時点およびオンされた時点の補機バッテリの電圧を車両１０から受信して取得する。なお、取得部４１は、補機バッテリの電圧に代えて、補機バッテリのＳＯＣ（State Of Charge）を取得してもよい。取得部４１は、取得した補機バッテリの電圧を判定部４２へ出力する。 Acquisition unit 41 receives and acquires, for example, the voltage of the auxiliary battery from vehicle 10 when the power of vehicle 10 is turned off and when it is turned on. Acquisition unit 41 may acquire the SOC (State Of Charge) of the auxiliary battery instead of the voltage of the auxiliary battery. Acquisition unit 41 outputs the acquired voltage of the auxiliary battery to determination unit 42 .

判定部４２は、取得部４１から入力される補機バッテリの電圧に基づいて、補機バッテリの状態を判定する。例えば、判定部４２は、車両１０の電源がオフされてから、次にオンされるまでの補機バッテリの電圧低下量が所定の閾値未満である場合に、補機電圧を新品と判定する。 The determination unit 42 determines the state of the auxiliary battery based on the voltage of the auxiliary battery input from the acquisition unit 41 . For example, the determining unit 42 determines that the auxiliary battery is new when the amount of voltage drop in the auxiliary battery from when the power of the vehicle 10 is turned off to when it is next turned on is less than a predetermined threshold value.

また、判定部４２は、車両１０の電源がオフされてから、次にオンされるまでの補機バッテリの電圧低下量が所定の閾値以上である場合に、補機バッテリが新品でないと判定する。さらに、判定部４２は、車両１０の電源がオフされてから、次にオンされるまでの時間と、その時間内に低下した電圧の低下量に基づいて、単位時間当たりの電圧の低下率を算出する。 Further, the determination unit 42 determines that the auxiliary battery is not new when the amount of voltage drop in the auxiliary battery from when the power of the vehicle 10 is turned off to when it is next turned on is equal to or greater than a predetermined threshold. . Furthermore, the determining unit 42 determines the voltage drop rate per unit time based on the time from when the power of the vehicle 10 is turned off to when it is next turned on and the amount of voltage drop during that time. calculate.

そして、判定部４２は、補機バッテリが新品か否かを示す情報と、補機バッテリが新品でない場合には、補機バッテリの電圧の低下率を示す情報とを補機バッテリの状態情報３１として記憶部３に記憶させる。 Then, determination unit 42 stores information indicating whether or not the auxiliary battery is new and, if the auxiliary battery is not new, information indicating the rate of decrease in the voltage of the auxiliary battery as status information 31 of auxiliary battery. is stored in the storage unit 3 as .

指令部４３は、車両１０の電源がオフされている期間に、記憶部３によって記憶された補機バッテリの状態情報３１に基づいて、メインバッテリから補機バッテリへの充電指令を車両１０へ送信する。これにより、バッテリ管理装置１は、駐車中の車両１０の消費電力を低減しつつ、補機バッテリのバッテリ上がりを防止することができる。 The command unit 43 transmits a command to charge the auxiliary battery from the main battery to the vehicle 10 based on the state information 31 of the auxiliary battery stored in the storage unit 3 while the vehicle 10 is powered off. do. As a result, the battery management device 1 can prevent the auxiliary battery from running out while reducing the power consumption of the parked vehicle 10 .

次に、図３～図７を参照して、バッテリ管理装置１の動作例について説明する。図３～図７は、実施形態に係るバッテリ管理装置１の動作説明図である。図３に示すように、バッテリ管理装置１は、電源オフ時の補機バッテリの電圧Ｖｏｆｆと、次回の電源オン時の補機バッテリの電圧Ｖｏｎとの差（電圧低下量）が所定の閾値以下の場合、補機バッテリを新品と判定する。 Next, an operation example of the battery management device 1 will be described with reference to FIGS. 3 to 7. FIG. 3 to 7 are operation explanatory diagrams of the battery management device 1 according to the embodiment. As shown in FIG. 3, in the battery management device 1, the difference (amount of voltage drop) between the voltage Voff of the auxiliary battery when the power is turned off and the voltage Von of the auxiliary battery when the power is turned on next time is equal to or less than a predetermined threshold. In the case of , the auxiliary battery is determined to be new.

この場合、バッテリ管理装置１は、車両１０への充電指令の送信を禁止する。これにより、車両１０は、充電指令の受信のために電力を消費することがなく、メインバッテリから補機バッテリへの無駄な充電を行うこともない。 In this case, the battery management device 1 prohibits transmission of the charging command to the vehicle 10 . As a result, the vehicle 10 does not consume power for receiving the charge command, and does not wastefully charge the auxiliary battery from the main battery.

また、図４に示すように、バッテリ管理装置１は、電源オフ時の補機バッテリの電圧Ｖｏｆｆと、次回の電源オン時の補機バッテリの電圧Ｖｏｎとの差（電圧低下量）が所定の閾値以上の場合、補機バッテリが劣化していると判定する。この場合、バッテリ管理装置１は、車両１０へ充電指令を送信する。 In addition, as shown in FIG. 4, the battery management device 1 sets the difference (amount of voltage drop) between the voltage Voff of the auxiliary battery when the power is turned off and the voltage Von of the auxiliary battery when the power is turned on next time to a predetermined value. If it is equal to or greater than the threshold, it is determined that the auxiliary battery has deteriorated. In this case, battery management device 1 transmits a charge command to vehicle 10 .

このとき、判定部４２は、電源オフ時の補機バッテリの電圧Ｖｏｆｆと、次回の電源オン時の補機バッテリの電圧Ｖｏｎとの差（電圧低下量）が大きいほど、補機バッテリの劣化度が高いと判定する。 At this time, the determining unit 42 determines the degree of deterioration of the auxiliary battery as the difference (amount of voltage drop) between the voltage Voff of the auxiliary battery when the power is turned off and the voltage Von of the auxiliary battery when the power is turned on next time is larger. is determined to be high.

このように、判定部４２は、常時、補機バッテリの状態を監視しなくても、電源オフ時の補機バッテリの電圧Ｖｏｆｆおよび次回の電源オン時の補機バッテリの電圧Ｖｏｎに基づいて、補機バッテリの劣化度を判定することができる。 In this way, even if the determination unit 42 does not always monitor the state of the auxiliary battery, based on the voltage Voff of the auxiliary battery when the power is turned off and the voltage Von of the auxiliary battery when the power is turned on next time, The degree of deterioration of the auxiliary battery can be determined.

例えば、図５に示すように、時刻ｔ１で車両１０の電源がオフされ、その後、時刻ｔ２でオンされたときに、オフ時の電圧Ｖｏｆｆとオン時の電圧Ｖｏｎとの差が所定の閾値以上であったとする。 For example, as shown in FIG. 5, when the vehicle 10 is turned off at time t1 and then turned on at time t2, the difference between the voltage Voff when turned off and the voltage Von when turned on is equal to or greater than a predetermined threshold. Suppose it was

このとき、バッテリ管理装置１は、オフ時の電圧Ｖｏｆｆとオン時の電圧Ｖｏｎとの差と、時刻ｔ１から時刻ｔ２までの時間とに基づいて、電源がオフの期間における補機バッテリの電圧の低下率（図５に示す電圧低下を示すグラフの傾き）を算出する。そして、バッテリ管理装置１は、算出した電圧の低下率を補機バッテリの状態情報３１として記憶する。 At this time, the battery management device 1 determines the voltage of the auxiliary battery during the period when the power is off, based on the difference between the voltage Voff when the power is off and the voltage Von when the power is on, and the time from time t1 to time t2. A drop rate (the slope of the graph showing the voltage drop shown in FIG. 5) is calculated. Then, the battery management device 1 stores the calculated rate of voltage drop as the state information 31 of the auxiliary battery.

補機バッテリは、時刻ｔ２で電源がオンされると充電されて電圧が上昇する。その後、時刻ｔ３で電源がオフされると、時刻ｔ３から電圧が低下を開始する。このとき、補機バッテリは、時刻ｔ１から時刻ｔ２までの時間における電圧の低下率と同じ低下率で電圧が低下を続ける可能性が高い。 When the auxiliary battery is turned on at time t2, it is charged and its voltage rises. After that, when the power is turned off at time t3, the voltage starts to drop from time t3. At this time, there is a high possibility that the voltage of the auxiliary battery will continue to drop at the same drop rate as the voltage drop rate during the period from time t1 to time t2.

そこで、バッテリ管理装置１は、補機バッテリの状態情報３１に基づいて、補機バッテリの電圧が時刻ｔ３から車両１０のＥＣＵ（Electronic Control Unit）を起動するために最低限必要な電圧Ｖｍｉｎに低下する時刻ｔ５までの時間Ｔｘを予測する。 Therefore, based on the auxiliary battery status information 31, the battery management device 1 reduces the voltage of the auxiliary battery to the minimum required voltage Vmin for activating the ECU (Electronic Control Unit) of the vehicle 10 from time t3. Predict time Tx up to time t5.

そして、バッテリ管理装置１は、時刻ｔ３から時間Ｔｘよりも所定時間（例えば、数時間）短い時間Ｔが経過する時刻ｔ４の時点で、車両１０へ充電指令を送信する。これにより、バッテリ管理装置１は、補機バッテリのバッテリ上がりを防止することができる。 Then, the battery management device 1 transmits a charging command to the vehicle 10 at a time t4 when a predetermined time (for example, several hours) shorter than the time Tx has elapsed from the time t3. As a result, the battery management device 1 can prevent the auxiliary battery from running out.

また、図６に示すように、バッテリ管理装置１は、例えば、図５に示した状況と同様に、車両１０の電源が時刻ｔ１でオフされた後、時刻ｔ２でオンされ、その後、時刻ｔ３でオフされる場合、時刻ｔ３で充電開始の予約指令を車両１０に送信することもできる。 Also, as shown in FIG. 6, the battery management device 1, for example, similarly to the situation shown in FIG. , it is also possible to transmit a reservation command to start charging to the vehicle 10 at time t3.

このとき、バッテリ管理装置１は、時刻ｔ３から前述した時間Ｔが経過した時点でメインバッテリから補機バッテリへの充電を開始する充電開始の予約指令を車両１０に送信する。車両１０は、時刻ｔ３から時間Ｔが経過するまでの間に、電源がオンされない場合、時刻ｔ４になるとメインバッテリから補機バッテリへ充電させる。 At this time, the battery management device 1 transmits to the vehicle 10 a charging start reservation command for starting charging of the auxiliary battery from the main battery when the time T described above has elapsed from the time t3. If the vehicle 10 is not powered on from time t3 until time T elapses, the vehicle 10 charges the auxiliary battery from the main battery at time t4.

これにより、バッテリ管理装置１は、時刻ｔ４に車両へ充電指令を送信する必要がなくなるため、車両１０が充電指令を受信するために使用する消費電力を削減することができる。 This eliminates the need for the battery management device 1 to transmit the charging command to the vehicle at the time t4, thereby reducing power consumption used by the vehicle 10 to receive the charging command.

また、図７に示すように、バッテリ管理装置１は、車両１０の電源がオフにされてから長期間オンにされない場合、電源がオフにされてから、前述した時間Ｔが経過する毎に、車両１０へ充電指令を送信することもできる。これにより、バッテリ管理装置１は、車両１０が長期間放置される場合であっても、メインバッテリに蓄電されていれば、補機バッテリのバッテリ上がりを防止することができる。 Further, as shown in FIG. 7, when the power of the vehicle 10 is not turned on for a long time after the power is turned off, the battery management device 1 is configured to A charge command can also be transmitted to the vehicle 10 . As a result, even if the vehicle 10 is left unused for a long period of time, the battery management device 1 can prevent the auxiliary battery from running out as long as the main battery is charged.

また、バッテリ管理装置１は、充電開始の予約指令を車両１０に送信する場合、車両１０の電源がオンされない期間には、前述した時間Ｔが経過する毎に、メインバッテリから補機バッテリへ充電させる情報を予約指令に含めて送信してもよい。これによっても、バッテリ管理装置１は、車両１０が長期間放置される場合であっても、メインバッテリに蓄電されていれば、補機バッテリのバッテリ上がりを防止することができる。 Further, when the battery management device 1 transmits a reservation command to start charging to the vehicle 10, the auxiliary battery is charged from the main battery every time the above-described time T elapses while the power of the vehicle 10 is not turned on. The reservation command may include the information to make the reservation and send it. Thus, even if the vehicle 10 is left unused for a long period of time, the battery management device 1 can prevent the auxiliary battery from running out as long as the main battery is charged.

次に、図８を参照してバッテリ管理装置１の制御部４が実行する処理について説明する。図８は、実施形態に係るバッテリ管理装置１の制御部４が実行する処理の一例を示すフローチャートである。制御部４は、例えば、車両１０からイグニッションスイッチまたはスタートスイッチがオフされたことを示す情報を受信した場合に、図８に示す処理を開始する。 Next, processing executed by the control unit 4 of the battery management device 1 will be described with reference to FIG. FIG. 8 is a flowchart showing an example of processing executed by the control unit 4 of the battery management device 1 according to the embodiment. For example, when receiving information indicating that the ignition switch or the start switch has been turned off from the vehicle 10, the control unit 4 starts the processing shown in FIG.

図８に示すように、制御部４は、まず、電源オフ時の補機バッテリの電圧を車両１０から取得する（ステップＳ１０１）。その後、制御部４は、電源オン時の補機バッテリの電圧を車両１０から取得する（ステップＳ１０２）。 As shown in FIG. 8, the control unit 4 first acquires the voltage of the auxiliary battery when the power is off from the vehicle 10 (step S101). After that, the control unit 4 acquires the voltage of the auxiliary battery when the power is turned on from the vehicle 10 (step S102).

続いて、制御部４は、取得した補機バッテリの電圧に基づいて、補機バッテリの状態を判定し、補機バッテリの状態情報３１を記憶部３に記憶させる（ステップＳ１０３）。その後、制御部４は、補機バッテリの状態情報３１に基づいて、補機バッテリが新品か否かを判定する（ステップＳ１０４）。 Subsequently, the control unit 4 determines the state of the auxiliary battery based on the acquired voltage of the auxiliary battery, and stores the state information 31 of the auxiliary battery in the storage unit 3 (step S103). After that, the control unit 4 determines whether or not the auxiliary battery is new based on the auxiliary battery status information 31 (step S104).

そして、制御部４は、補機バッテリが新品であると判定した場合（ステップＳ１０４，Ｙｅｓ）、充電指令の送信を禁止し（ステップＳ１０５）、処理を終了する。また、制御部４は、補機バッテリが新品でないと判定した場合（ステップＳ１０４，Ｎｏ）、車両１０の電源がオンされたか否かを判定する（ステップＳ１０６）。 If the control unit 4 determines that the auxiliary battery is new (step S104, Yes), the control unit 4 prohibits transmission of the charge command (step S105), and terminates the process. When the control unit 4 determines that the auxiliary battery is not new (step S104, No), the control unit 4 determines whether or not the vehicle 10 is powered on (step S106).

そして、制御部４は、車両１０の電源がオンされたと判定した場合（ステップＳ１０６，Ｙｅｓ）、処理を終了する。また、制御部４は、車両１０の電源がオンされていないと判定した場合（ステップＳ１０６，Ｎｏ）、補機バッテリの電圧が所定電圧以下になるか否かを判定する（ステップＳ１０７）。 When the controller 4 determines that the vehicle 10 is powered on (step S106, Yes), the process ends. When the control unit 4 determines that the vehicle 10 is not powered on (step S106, No), the control unit 4 determines whether the voltage of the auxiliary battery is equal to or lower than the predetermined voltage (step S107).

そして、制御部４は、補機バッテリの電圧が所定電圧以下にならないと判定した場合（ステップＳ１０７，Ｎｏ）、処理をステップＳ１０６へ移す。また、制御部４は、補機バッテリの電圧が所定電圧以下になると判定した場合（ステップＳ１０７，Ｙｅｓ）、充電指令を車両１０へ送信し（ステップＳ１０８）、処理を終了する。 When the control unit 4 determines that the voltage of the auxiliary battery does not drop below the predetermined voltage (step S107, No), the process proceeds to step S106. Further, when the control unit 4 determines that the voltage of the auxiliary battery becomes equal to or lower than the predetermined voltage (step S107, Yes), the control unit 4 transmits a charge command to the vehicle 10 (step S108), and ends the process.

なお、ここでは、制御部４が車両１０の駐車期間内に、補機バッテリの電圧が所定電圧以下になると判定した場合に、１回、充電指令を車両１０へ送信する場合について説明したが、これは一例である。 Here, the case where the control unit 4 transmits the charging command to the vehicle 10 once when it determines that the voltage of the auxiliary battery becomes equal to or lower than the predetermined voltage during the parking period of the vehicle 10 has been described. This is an example.

制御部４は、例えば、充電指令を車両１０へ送信した後、車両１０の電源がオンされない場合、充電指令を車両１０に送信してから、補機バッテリの電圧が再度所定電圧以下になることが予測されるタイミングで充電指令を車両１０へ送信することもできる。 For example, when the power of the vehicle 10 is not turned on after transmitting the charging command to the vehicle 10, the control unit 4 transmits the charging command to the vehicle 10, and then the voltage of the auxiliary battery becomes equal to or less than the predetermined voltage again. It is also possible to transmit the charging command to the vehicle 10 at the timing when the is predicted.

さらなる効果や変形例は、当業者によって容易に導き出すことができる。このため、本発明のより広範な態様は、以上のように表しかつ記述した特定の詳細および代表的な実施形態に限定されるものではない。したがって、添付の特許請求の範囲およびその均等物によって定義される総括的な発明の概念の精神または範囲から逸脱することなく、様々な変更が可能である。 Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments so shown and described. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and equivalents thereof.

１ バッテリ管理装置
２ 通信部
３ 記憶部
３１ 補機バッテリの状態情報
４ 制御部
４１ 取得部
４２ 判定部
４３ 指令部
１０，１０－ｎ 車両
１００ 通信ネットワーク Reference Signs List 1 battery management device 2 communication unit 3 storage unit 31 auxiliary battery status information 4 control unit 41 acquisition unit 42 determination unit 43 command unit 10, 10-n vehicle 100 communication network

Claims (5)

メインバッテリと補機バッテリとを備える車両の電源がオフされた時点およびオンされた時点の前記補機バッテリの電圧を前記車両から受信して取得する取得部と、
前記取得部によって取得される前記電圧に基づいて前記補機バッテリの状態を判定する判定部と、
前記判定部によって判定される前記補機バッテリの状態を記憶する記憶部と、
前記車両の電源がオフされている期間に、前記記憶部によって記憶された前記補機バッテリの状態に基づいて、前記メインバッテリから前記補機バッテリへ充電させる指令を前記車両へ送信する指令部と
を備え、
前記指令部は、
前記車両の電源がオフにされた場合に、前記メインバッテリから前記補機バッテリへの充電を開始させるまでの時間を前記車両に通知する
バッテリ管理装置。 an acquisition unit configured to receive and acquire voltages of the auxiliary battery from the vehicle when the power of the vehicle including the main battery and the auxiliary battery is turned off and when the power is turned on;
a determination unit that determines the state of the auxiliary battery based on the voltage acquired by the acquisition unit;
a storage unit that stores the state of the auxiliary battery determined by the determination unit;
a command unit configured to transmit to the vehicle a command to charge the auxiliary battery from the main battery based on the state of the auxiliary battery stored by the storage unit while the vehicle is powered off; with
The command unit
Notifying the vehicle of the time until charging of the auxiliary battery from the main battery is started when the power of the vehicle is turned off.
Battery management device. 前記判定部は、
バッテリの劣化度を判定する
請求項１に記載のバッテリ管理装置。 The determination unit is
The battery management device according to claim 1, wherein the degree of deterioration of the battery is determined. 前記指令部は、
前記判定部によって前記補機バッテリが新品であると判定された場合に、前記指令の送信を禁止する
請求項１または請求項２に記載のバッテリ管理装置。 The command unit
3. The battery management device according to claim 1, wherein transmission of the command is prohibited when the determining unit determines that the auxiliary battery is new. 前記判定部は、
前記車両の電源がオフされている期間における前記補機バッテリの電圧の低下率を判定し、
前記指令部は、
前記補機バッテリの電圧が所定電圧以下になると予測したタイミングになると、前記指令を前記車両へ送信する
請求項１～３のいずれか一つに記載のバッテリ管理装置。 The determination unit is
determining a rate of decrease in voltage of the auxiliary battery during a period in which the vehicle is powered off;
The command unit
The battery management device according to any one of claims 1 to 3, wherein the command is transmitted to the vehicle at a timing when it is predicted that the voltage of the auxiliary battery will drop below a predetermined voltage. メインバッテリと補機バッテリとを備える車両の電源がオフされた時点およびオンされた時点の前記補機バッテリの電圧を前記車両から受信して取得する取得工程と、
前記取得工程によって取得される前記電圧に基づいて前記補機バッテリの状態を判定する判定工程と、
前記判定工程によって判定される前記補機バッテリの状態を記憶する記憶工程と、
前記車両の電源がオフされている期間に、前記記憶工程によって記憶された前記補機バッテリの状態に基づいて、前記メインバッテリから前記補機バッテリへ充電させる指令を前記車両へ送信する指令工程と
を含み、
前記指令工程は、
前記車両の電源がオフにされた場合に、前記メインバッテリから前記補機バッテリへの充電を開始させるまでの時間を前記車両に通知する
バッテリ管理方法。 an acquiring step of receiving and acquiring from the vehicle voltages of the auxiliary battery at times when the vehicle including the main battery and the auxiliary battery is turned off and when the power is turned on;
a determining step of determining the state of the auxiliary battery based on the voltage obtained by the obtaining step;
a storing step of storing the state of the auxiliary battery determined by the determining step;
a command step of transmitting to the vehicle a command to charge the auxiliary battery from the main battery based on the state of the auxiliary battery stored in the storing step while the vehicle is powered off; including
The command step includes
Notifying the vehicle of the time until charging of the auxiliary battery from the main battery is started when the power of the vehicle is turned off.
Battery management method.
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