WO2015015596A1 - Système de batterie - Google Patents

Système de batterie Download PDF

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Publication number
WO2015015596A1
WO2015015596A1 PCT/JP2013/070761 JP2013070761W WO2015015596A1 WO 2015015596 A1 WO2015015596 A1 WO 2015015596A1 JP 2013070761 W JP2013070761 W JP 2013070761W WO 2015015596 A1 WO2015015596 A1 WO 2015015596A1
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WO
WIPO (PCT)
Prior art keywords
battery
battery cell
management device
communication
cell group
Prior art date
Application number
PCT/JP2013/070761
Other languages
English (en)
Japanese (ja)
Inventor
孝徳 山添
裕 有田
洋平 河原
寛 岩澤
Original Assignee
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to PCT/JP2013/070761 priority Critical patent/WO2015015596A1/fr
Publication of WO2015015596A1 publication Critical patent/WO2015015596A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
    • 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

Definitions

  • the present invention relates to a battery system.
  • the storage battery module constituting this is generally configured by connecting a plurality of battery cells in series and parallel.
  • Lithium ion batteries are widely known as large capacity secondary batteries. In handling lithium ion batteries, measures such as prevention of high voltage charging and deterioration of performance due to overdischarge are required. For this reason, a storage battery module that is mounted on a hybrid electric vehicle or an electric vehicle and that uses a lithium ion battery for each battery cell generally monitors the battery state such as voltage, current, and temperature for each battery cell. It has the function to control each battery cell according to.
  • Patent Documents 1 and 2 As a method for realizing control of a battery cell in accordance with the battery state as described above, for example, techniques disclosed in Patent Documents 1 and 2 below are known.
  • a discharge circuit and a switch are provided for each battery cell, and the switch is controlled to open and close according to the state of charge (SOC) of each battery cell.
  • SOC state of charge
  • the battery cell control method by the assembled battery control means disclosed in Patent Document 2 when there is a group of battery cells whose SOC is higher than a predetermined charging state, the battery cell group is stopped when charging / discharging of the assembled battery is stopped.
  • the single battery control means corresponding to the above, the battery cells of the battery cell group are discharged to adjust the SOC variation between the battery cell groups.
  • the battery control device since it is necessary to provide a discharge circuit and a switch for each battery cell in the battery control device, the battery control device may be increased in cost and reliability. There is. Further, in the battery cell control method disclosed in Patent Document 2, since the SOC variation is adjusted when charging / discharging of the assembled battery is stopped, the SOC variation cannot be adjusted in real time during charging / discharging.
  • a battery system includes a battery cell group configured by one or a plurality of battery cells, and a battery cell that is provided corresponding to the battery cell group and obtains a measurement result regarding a charge state of the battery cell of the battery cell group. And a battery pack management device that performs wireless or wired communication between the management device and the battery cell management device.
  • the battery cell management device transmits the measurement result to the assembled battery management device using the power supplied from the battery cells of the battery cell group. Further, the assembled battery management device estimates the charge state of the battery cells of the battery cell group based on the measurement result transmitted from the battery cell management device, and based on the estimation result of the charge state, Change the amount of communication between them.
  • the present invention it is possible to adjust the SOC variation of the battery cell in real time during charge / discharge without requiring a special circuit or component.
  • FIG. 1 is a diagram showing a configuration of an in-vehicle system including a battery system according to an embodiment of the present invention.
  • the in-vehicle system shown in FIG. 1 is mounted on a vehicle such as a hybrid electric vehicle or an electric vehicle, and includes a battery system 1, an inverter 2, a motor 3, a relay box 4, and a host controller 5.
  • the battery system 1 includes one or a plurality of battery cell groups 10 each constituted by one or a plurality of battery cells, and the battery cell management device 100 corresponds to each battery cell group 10. Is provided. Each battery cell management device 100 performs measurement (voltage, current, temperature, etc.) related to the state of charge (SOC: State of Charge) or the deterioration state (SOH: State of Health) of the battery cell group 10. Then, using the power supplied from the battery cells of the battery cell group 10, wireless (or wired) communication is performed with the assembled battery monitoring device 200, and measurement results regarding the charge state and the deterioration state of the battery cell group 10 are obtained. It transmits to the assembled battery monitoring apparatus 200. Details of communication performed at this time will be described later.
  • the assembled battery monitoring device 200 acquires a measurement result related to the charge state or the deterioration state of the battery cell group 10 corresponding to the battery cell management device 100 from each battery cell management device 100. Then, based on the acquired measurement result, the charged state and the deteriorated state of each battery cell group 10 are estimated, and the estimated result is transmitted to the host controller 5.
  • the host controller 5 controls the inverter 2 and the relay box 4 based on the estimation result of the charged state and the deteriorated state of each battery cell group 10 transmitted from the assembled battery monitoring device 200.
  • the inverter 2 converts the DC power supplied from each battery cell group 10 into three-phase AC power when the relay box 4 is in a conductive state, and supplies the three-phase AC power to the motor 3, thereby driving the motor 3 to rotate. Generate driving force. Further, when the vehicle is braked, the battery cells of each battery cell group 10 are charged by converting the three-phase AC regenerative power generated by the motor 3 into DC power and outputting it to each battery cell group 10. The operation of the inverter 2 is controlled by the host controller 5.
  • FIG. 2 is a diagram showing a configuration example of the battery system 1 according to the first embodiment of the present invention.
  • the battery system 1 shown in FIG. 2 further includes a temperature detection unit 300 and a current detection unit 400 in addition to the battery cell group 10, the battery cell management device 100, and the assembled battery monitoring device 200 shown in FIG.
  • FIG. 2 shows an example in which n battery cell groups 10 and n battery cell management devices 100 are provided in the battery system 1.
  • the first, second, and nth battery cell groups 10 are represented by reference numerals 10-1, 10-2, and 10-n, respectively, and the first, second, and nth provided corresponding thereto.
  • the battery cell management devices 100 are denoted by reference numerals 100-1, 100-2, and 100-n, respectively.
  • the temperature detection means 300 detects the temperature of the battery system 1 and outputs the detection result to the assembled battery management apparatus 200 as the temperature of each battery cell group 10.
  • the current detection unit 400 detects a current flowing through the battery cell group 10 connected in series, and outputs the detection result to the assembled battery management apparatus 200.
  • the battery cell management device 100 includes a battery control unit 20 and a communication control unit 30.
  • the battery control unit 20 detects the voltage of each battery cell of the corresponding battery cell group 10 to acquire a measurement result regarding the charging state or the deterioration state of the battery cell group 10, and sends the measurement result to the communication control unit 30. Output.
  • the communication control unit 30 uses the electric power supplied from the battery cells of the corresponding battery cell group 10 to display the voltage detection result of each battery cell input from the battery control unit 20 by wireless (or wired) communication. It transmits to the management apparatus 200.
  • each battery cell management device 100 may be individually connected to the assembled battery management device 200.
  • a plurality of battery cell management devices 100 may be connected in a daisy chain, and one or both ends thereof may be connected to the assembled battery management device 200.
  • the assembled battery management device 200 acquires the temperature detected by the temperature detection means 300 and the current detected by the current detection means 400. Moreover, the voltage of each battery cell of the battery cell group 10 corresponding to each battery cell management apparatus 100 is acquired by performing communication with each battery cell management apparatus 100. Based on these pieces of information, the assembled battery management apparatus 200 can estimate the state of charge (SOC) and the state of deterioration (SOH) of each battery cell group 10.
  • SOC state of charge
  • SOH state of deterioration
  • the assembled battery management apparatus 200 calculates the average SOC of the battery cell group 10 by calculating the average value.
  • the frequency of communication performed with the battery cell management device 100 to which the battery cell group 10 is connected is determined. It is increased more than other battery cell management devices 100.
  • the power consumption required for communication when transmitting the voltage detection result of the battery cell from the battery cell monitoring device 100 to the assembled battery management device 200 is increased more than that of the other battery cell monitoring devices 100.
  • the SOC of the battery cell group 10 connected to the battery cell monitoring device 100 can be relatively lowered, and the SOC can be adjusted with the other battery cell group 10.
  • FIG. 3 is a diagram showing an example of a communication flow between the assembled battery management device 200 and the battery cell management devices 100-1 to 100-n.
  • the assembled battery management device 200 first transmits a command 1 as a command for reading the voltage value of the battery cell group 10-1 to the first battery cell management device 100-1. To do.
  • the battery cell management device 100-1 Upon receiving this command 1, the battery cell management device 100-1 detects the voltage of each battery cell in the connected battery cell group 10-1, and returns the voltage value data as response 1 to the assembled battery management device 200. To do.
  • the assembled battery management device 200 transmits a command 2 as a command for reading the voltage value of the battery cell group 10-2 to the second battery cell management device 100-2 in the same manner.
  • the battery cell management device 100-2 receives this command 2, the battery cell management device 100-2 detects the voltage of each battery cell in the connected battery cell group 10-2, and returns the voltage value data as response 2 to the assembled battery management device 200. To do.
  • the assembled battery management device 200 repeatedly transmits the command and receives the response as described above up to the nth battery cell management device 100-n. Thereby, the voltage value of each battery cell group 10 can be acquired from each battery cell monitoring device 100 as data for calculating the SOC of each battery cell group 10.
  • the communication between the assembled battery management device 200 and the battery cell management devices 100-1 to 100-n using the communication flow described above can be realized by, for example, time division wireless communication using a plurality of communication slots. it can. That is, the assembled battery management device 200 and each battery cell management device 100 (battery cell management devices 100-1 to 100-n) use this communication slot assigned to each battery cell management device 100, respectively. Such time division wireless communication can be performed.
  • the assembled battery management apparatus 200 uses the voltage value of each battery cell group 10 acquired as described above, and the temperature and current values acquired from the temperature detection means 300 and the current detection means 400, respectively. An SOC of 10 is estimated. As a result, for example, it is assumed that the SOC of the battery cell group 10-1 is higher than the value obtained by adding the specified value ⁇ % to the average SOC in the first voltage recognition cycle. In such a case, as shown in FIG. 3, the assembled battery management device 200 transmits command 1 to the battery cell management device 100-1 corresponding to the battery cell group 10-1 in the next second voltage recognition cycle. By increasing the number of times, the number of times response 1 is returned from battery cell management device 100-1 is increased.
  • the number of communication slots assigned to the battery cell management apparatus 100-1 is increased to increase the amount of communication performed with the battery cell management apparatus 100-1.
  • the power consumption in the battery cell group 10-1 can be made larger than that in the other battery cell groups, and the SOC of the battery cell group 10-1 can be relatively lowered.
  • the assembled battery management device 200 has been described as increasing the amount of communication performed with the battery cell management device 100 corresponding to the battery cell group 10 having a high SOC. Conversely, the amount of communication performed with the battery cell management device 100 corresponding to the battery cell group 10 having a low SOC may be reduced. For example, it is assumed that the SOC of battery cell group 10-1 is lower than the value obtained by subtracting the specified value ⁇ % from the average SOC. In such a case, the assembled battery management device 200 does not transmit the command 1 to the battery cell management device 100-1 corresponding to the battery cell group 10-1 in the next voltage recognition cycle.
  • the number of times the response 1 is returned from the battery cell management device 100-1 is reduced, and the number of communication slots assigned to the battery cell management device 100-1 is reduced. Reduce the amount of communication between them.
  • the power consumption in the battery cell group 10-1 can be made smaller than that in the other battery cell groups, and the SOC of the battery cell group 10-1 can be relatively increased.
  • the assembled battery management device 200 changes the amount of communication performed with each battery cell management device 100 based on the estimation result of the SOC of each battery cell group 10. Thereby, the dispersion
  • the amount of communication is increased.
  • the amount of communication may be changed by other methods. For example, a plurality of types of commands are prepared in the assembled battery management device 200, and the length of the response returned from each battery cell management device 100, that is, the length of the communication slot is changed according to the type of the command. To. And according to the magnitude
  • the communication time for transmitting the measurement result is changed. Even in this way, the assembled battery management device 200 can change the amount of communication performed with each battery cell management device 100 based on the estimation result of the SOC of each battery cell group 10. As a result, variation in SOC of each battery cell group 10 can be adjusted.
  • the two methods described above may be used in combination. That is, the assembled battery management device 200 changes each battery cell management device 100 by changing at least one of the communication frequency and the communication time for causing each battery cell management device 100 to transmit the voltage measurement result of the battery cell group 10. The amount of communication performed between the two can be changed.
  • the battery system 1 is provided corresponding to the battery cell group 10 constituted by one or a plurality of battery cells and the battery cell group 10, and the measurement result regarding the charge state of the battery cells of the battery cell group 10
  • a battery cell management device 100 to be acquired and a battery pack management device 200 that performs wireless or wired communication with the battery cell management device 100 are provided.
  • the battery cell management device 100 transmits the measurement result to the assembled battery management device 200 using the power supplied from the battery cells of the battery cell group 10.
  • the assembled battery management device 200 estimates the state of charge (SOC) of the battery cells of the battery cell group 10 based on the measurement result transmitted from the battery cell management device 100, and based on the estimation result of the SOC, the battery cell
  • the amount of communication performed with the management apparatus 100 is changed. Since it did in this way, the dispersion
  • the battery cell management device 100 transmits a measurement result to the assembled battery management device 200 in response to a command from the assembled battery management device 200.
  • the assembled battery management device 200 changes the amount of communication performed with the battery cell management device 100 by changing at least one of the communication frequency and the communication time for causing the battery cell management device 100 to transmit the measurement result. . Since it did in this way, the amount of communication performed between the assembled battery management apparatus 200 and the battery cell management apparatus 100 can be changed appropriately and easily.
  • the battery system 1 includes a plurality of battery cell groups 10 and a plurality of battery cell management devices 100 corresponding to the respective battery cell groups 10.
  • the assembled battery management device 200 and the plurality of battery cell management devices 100 can perform time-division wireless communication using a communication slot assigned to each battery cell management device 100.
  • the assembled battery management device 200 changes the amount of communication performed with the battery cell management device 100 by changing at least one of the number and the length of the communication slots based on the estimation result of the SOC. Since it did in this way, when performing wireless communication between the assembled battery management apparatus 200 and each battery cell management apparatus 100, the communication amount in the wireless communication can be changed appropriately and easily.
  • the battery cell group 10 demonstrated the example comprised with the some battery cell.
  • the SOC can be adjusted between the plurality of battery cell groups 10, but the SOC cannot be adjusted between the plurality of battery cells included in the same battery cell group 10. Therefore, in a second embodiment described below, an example in which such a problem is solved by configuring the battery cell group 10 by one battery cell will be described.
  • FIG. 4 is a diagram showing a configuration example of the battery system 1 according to the second embodiment of the present invention.
  • each battery cell group 10 (battery cell groups 10-1 to 10-m) is configured by one battery cell as compared with the one according to the first embodiment shown in FIG. Is different.
  • m represents the number of battery cell groups 10 (that is, the number of battery cells).
  • the battery cell management device 100 is assigned to each battery cell. Therefore, by using the method described in the first embodiment, the amount of communication performed between each battery cell management device 100 and the battery management device 200 is set to the battery cell corresponding to each battery cell management device 100.
  • the SOC of each battery cell can be adjusted by changing the SOC according to the SOC.
  • the battery cell group 10 is constituted by one battery cell, and the battery cell management device 100 corresponds to one battery cell constituting the battery cell group 10. Is provided. Since it did in this way, SOC can be adjusted between battery cells.
  • the battery cell group 10 was comprised by one battery cell, and the example which enabled adjustment of SOC between battery cells was demonstrated.
  • 3rd Embodiment demonstrated below demonstrates the example which enables adjustment of SOC between battery cells, when the battery cell group 10 is comprised by the some battery cell.
  • FIG. 5 is a diagram showing a configuration example of the battery system 1 according to the third embodiment of the present invention.
  • the battery system 1 shown in FIG. 5 is different from that according to the first embodiment shown in FIG. 2 in that each battery cell management device 100 (battery cell management devices 100-1 to 100-n) has a battery.
  • the control unit 20 is different in that a selection circuit 21 is further mounted.
  • the selection circuit 21 includes a battery cell group connected to the battery control unit 20 for a battery cell that receives power supply when the communication control unit 30 transmits the voltage of the battery cell of the battery cell group 10 to the assembled battery management device 200. Select from 10 battery cells. Using the power supplied from the battery cell selected by the selection circuit 21, the communication control unit 30 uses the wireless (or wired) communication to determine the voltage detection result of each battery cell input from the battery control unit 20. It transmits to the management apparatus 200.
  • the battery cell selection operation by the selection circuit 21 is preferably performed based on an instruction from the assembled battery management device 200.
  • the assembled battery management device 200 uses the selection circuit 21 based on the estimation result of the SOC of each battery cell constituting each battery cell group 10 in the command (see FIG. 3) transmitted to each battery cell management device 100.
  • Each battery cell management apparatus 100 is instructed which battery cell to select.
  • each battery cell management device 100 operates the selection circuit 21 to transfer the corresponding battery cell from the corresponding battery cells of the battery cell group 10 to the communication control unit 30. It can be selected as a power supply source.
  • the battery cell group 10 includes a plurality of battery cells, and each battery cell management device 100 transmits a measurement result to the assembled battery management device 200.
  • a selection circuit 21 is provided for selecting a battery cell to be supplied with power from a plurality of battery cells.
  • the assembled battery management apparatus 200 instructs each battery cell management apparatus 100 to select a battery cell by the selection circuit 21 based on the estimation result of the SOC. Since it did in this way, when battery cell group 10 comprises a plurality of battery cells, SOC can be adjusted between battery cells.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un système de batterie comprenant les éléments suivants : des groupes de cellules de batterie ; des appareils de gestion de cellule de batterie, chacun obtenant des résultats de mesure en rapport avec les états de charge des cellules de batterie dans un groupe de cellules de batterie correspondant ; et un appareil de gestion de bloc de batterie qui réalise la communication sans fil ou filaire avec les appareils de gestion de cellule de batterie. Chaque appareil de gestion de cellule de batterie utilise l'énergie délivrée par les cellules de batterie dans le groupe de cellules de batterie correspondant pour transmettre lesdits résultats de mesure à l'appareil de gestion de bloc de batterie. Sur la base des résultats de mesure transmis depuis les appareils de gestion de cellule de batterie, l'appareil de gestion de bloc de batterie estime les états de charge des cellules de batterie dans le groupe de cellules de batterie et, en se basant sur les résultats de ladite estimation, modifie le volume de communication réalisé avec les appareils de gestion de cellule de batterie.
PCT/JP2013/070761 2013-07-31 2013-07-31 Système de batterie WO2015015596A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2013/070761 WO2015015596A1 (fr) 2013-07-31 2013-07-31 Système de batterie

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Application Number Priority Date Filing Date Title
PCT/JP2013/070761 WO2015015596A1 (fr) 2013-07-31 2013-07-31 Système de batterie

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10201127A (ja) * 1996-12-27 1998-07-31 Nec Corp 通信システム
JP2011059931A (ja) * 2009-09-09 2011-03-24 Tokai Rika Co Ltd 遠隔操作システム及び電源充電式通信端末
WO2012039096A1 (fr) * 2010-09-21 2012-03-29 三洋電機株式会社 Appareil d'éclairage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10201127A (ja) * 1996-12-27 1998-07-31 Nec Corp 通信システム
JP2011059931A (ja) * 2009-09-09 2011-03-24 Tokai Rika Co Ltd 遠隔操作システム及び電源充電式通信端末
WO2012039096A1 (fr) * 2010-09-21 2012-03-29 三洋電機株式会社 Appareil d'éclairage

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