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WO2012111410A1 - Système de cellule électrique - Google Patents

Système de cellule électrique Download PDF

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Publication number
WO2012111410A1
WO2012111410A1 PCT/JP2012/051894 JP2012051894W WO2012111410A1 WO 2012111410 A1 WO2012111410 A1 WO 2012111410A1 JP 2012051894 W JP2012051894 W JP 2012051894W WO 2012111410 A1 WO2012111410 A1 WO 2012111410A1
Authority
WO
WIPO (PCT)
Prior art keywords
series
circuit
protection circuit
battery system
units
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2012/051894
Other languages
English (en)
Japanese (ja)
Inventor
橋本　英樹
巧 大矢
聡馬 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of WO2012111410A1 publication Critical patent/WO2012111410A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H02J7/52—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

Definitions

  • the present invention relates to a technical field of a battery system having a power supply circuit in which a plurality of series units each having a plurality of secondary battery cells connected in series are connected in parallel.
  • Lithium ion secondary batteries nickel metal hydride batteries, lead batteries and the like are known as chargeable / dischargeable secondary batteries.
  • chargeable / dischargeable secondary batteries As an application field of this type of secondary battery, for example, there is a battery system mounted on a system that requires a large amount of power, such as an electric vehicle or a hybrid electric vehicle.
  • lithium ion secondary batteries are characterized by high energy density, high input / output density, and long cycle life. Therefore, research and development in this field are actively conducted.
  • Battery systems are operated by combining a plurality of secondary battery cells to form a power circuit.
  • a power supply circuit used for supplying a large amount of power may be configured by combining series units formed by connecting a plurality of secondary battery cells in series. This configuration has an advantage that an excessive current can be prevented from flowing between battery cells when a problem such as a short circuit occurs in the power supply circuit due to some cause.
  • Patent Document 1 discloses a technique for suppressing variations in the current value flowing through each series unit.
  • state information is detected for each series unit, and the amount of current flowing through each series unit is controlled based on the detected state information, thereby suppressing variations in current value and enabling the life of the battery system.
  • a technique for making it as long as possible is disclosed. Such adjustment of the current amount is performed by a power distribution unit inserted in series in each series unit, and the power distribution unit includes elements such as a variable resistor, a switched capacitor, a DC / DC converter, and a DC chopper, for example. Yes.
  • Patent Document 1 it is necessary to provide a power distribution unit and detection means for detecting state information for controlling the power distribution unit on a one-on-one basis with the series unit. Therefore, Patent Document 1 has a problem that the circuit configuration of the battery system is complicated, and it is difficult to realize the battery system at low cost.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a battery system capable of suppressing current value variation in each series unit at a low cost.
  • the battery system of the present invention has a power supply circuit in which n series units each having a plurality of secondary battery cells connected in series are connected in parallel to each other, and an output terminal of the power supply circuit Are connected in series with each other in a battery system that supplies power to the load side via an inverter connected to an output terminal of the first protection circuit. Further, (n-1) second protection circuits connected in series between the positive electrodes of the n series units and capable of variably controlling the resistance value are provided.
  • the present invention it is possible to suppress variation in the current value between the series units by variably controlling the resistance value in the (n ⁇ 1) second protection circuits. That is, in Patent Document 1, since it is necessary to provide the second protection circuit on a one-to-one basis with the series unit, a total of n second protection circuits are required. That's it. As described above, according to the present invention, the number of elements constituting the circuit can be reduced, so that the battery system can be downsized at the same time as the cost reduction.
  • the resistance value of each of the second protection circuits may be controlled so that variation in the current value flowing through each of the second protection circuits is reduced. For example, by monitoring the current value flowing through each second protection circuit, the variation in the current value is measured, and the resistance value of each second protection resistor is controlled so as to reduce the variation in the obtained current value. To adjust.
  • the second protection circuit includes a first circuit in which a first switching unit and a fixed resistor are connected in series, and a second circuit including only the second switching unit. May be connected in parallel.
  • the resistance value is variably controlled with a simpler circuit configuration by switching between the first circuit having a resistance value corresponding to the fixed resistance and the second circuit having a resistance value of substantially zero. Can do.
  • a capacitor may be connected in parallel to the fixed resistor. Since the battery cells constituting the battery system generate electric power mainly by a chemical reaction, it may be difficult to output sufficient electric power to meet the demand on the load side at the time of starting. In this aspect, by using the power stored in the capacitor in advance at the time of starting the battery system, it is possible to supply power quickly in response to a request from the load side.
  • the second protection circuit may comprise a variable resistor connected in series to the (n-1) series units.
  • the variable control of the resistance value in the second circuit can be performed with finer accuracy.
  • the n series units include at least one master unit and other slave units, and the second protection circuit in the slave unit has an output voltage of the master unit of a predetermined value.
  • the resistance value may be variably controlled so that
  • the second protection circuit in the slave unit may include a DC / DC converter or a chopper circuit connected in series to the slave unit.
  • the present invention it is possible to suppress variation in the current value between the series units by variably controlling the resistance value in the (n ⁇ 1) second protection circuits. That is, in Patent Document 1, since it is necessary to provide the second protection circuit on a one-to-one basis with the series unit, a total of n second protection circuits are required. That's it. As described above, according to the present invention, the number of elements constituting the circuit can be reduced, so that the battery system can be downsized at the same time as the cost reduction.
  • a specific circuit configuration of the protection circuit included in the battery system according to the first embodiment will be described.
  • It is a circuit diagram which shows the other modification of a 2nd protection circuit It is a block diagram which shows the whole structure of the battery system which concerns on 2nd Example.
  • FIG. 1 is a block diagram showing the overall configuration of the battery system 100 according to the first embodiment.
  • the electrical system 100 includes a power supply circuit 2 including a plurality of series units 1 in which a plurality of secondary battery cells are connected in series.
  • the output terminal 2 a of the power supply circuit 2 includes a first power supply circuit 2.
  • An electric motor 3, which is a three-phase induction motor, is connected via a protection circuit 4 (hereinafter referred to as “protection circuit 4”) and an inverter 7.
  • the DC power output from the power supply circuit 2 is converted into AC power having a frequency and voltage value suitable for driving the electric motor 3 by the inverter 7 and supplied to the electric motor 3 as a load.
  • the inverter 7 is an inverter circuit of a motor control system that drives the electric motor 3 that is a three-phase induction motor and has a low driving frequency and a large current and a large power. Typically, it is a three-phase output inverter using six switching elements, and has a function of facilitating adjustment of the rotational speed and output torque of the electric motor 3 and greatly improving efficiency.
  • the power supply motor 3 is driven by the AC power supplied through the inverter 7 as described above, and is connected to driving wheels through a power transmission mechanism connected to the output shaft thereof, so that the vehicle travels.
  • the inverter 7 includes a smoothing capacitor or the like, and an excessive inrush current may be temporarily generated when the battery system 100 is started.
  • the protection circuit 4 is provided to protect the electric motor 3 side from such an inrush current, and a specific circuit configuration thereof will be described later.
  • Such a protection circuit 4 is also used when a power electronic component such as a DC / DC converter including a smoothing capacitor or the like is used instead of the inverter 7.
  • a voltmeter 8 is provided on a line connecting the protection circuit 4 and the inverter 7 so that the input voltage value to the inverter 7 can be monitored.
  • the voltage value monitored by the voltmeter 8 is transmitted to the controller 30 that governs overall control of the battery system 100, and is used to implement control described later.
  • the power supply circuit 2 includes a plurality of series units 1 connected in parallel to each other, and a second protection circuit is provided on the wiring connecting the positive electrodes of the series units 1. 6 (hereinafter referred to as “protection circuit 6”) are connected in series.
  • the secondary battery cell included in the series unit 1 is, for example, a lithium ion secondary battery cell, but various secondary battery cells such as a nickel metal hydride battery and a lead battery may be used.
  • an ammeter 9 is connected in series to the positive electrode side of each series unit 1 so that the current value output from each series unit 1 can be monitored.
  • the current value monitored by the ammeter 9 is transmitted to the controller 30 that controls the entire battery system 100, and is used to implement the control described later.
  • each series unit 1 connected in parallel has the same configuration and is connected to the same load (electric motor 3), the current output from each series unit 1 is ideal. The values are equal. However, in reality, the output current value varies due to the individual difference between the secondary battery cells included in each series unit 1 and the operating temperature difference of each series unit 1. Then, in the series unit 1 with a large current value to be output, the deterioration of the battery cell proceeds, and the output voltage decreases. As a result, current flows between the series units 1 due to a potential difference with the other series units 1 connected in parallel, and the battery system 100 may be in a dangerous state.
  • Patent Document 1 in order to suppress such a variation in the current value output from the power supply circuit 2, it is necessary to provide the protection circuits 6 on a one-to-one basis for n series units. That is, in the prior art, when there are three series units 1, it is necessary to provide three protection circuits 6. On the other hand, in the present invention, two protection circuits 6 are sufficient for the three series units 1. Therefore, the circuitized configuration can be simplified, and a battery system adapted for cost reduction and downsizing can be realized.
  • FIG. 2 is a circuit diagram illustrating a configuration of the protection circuit 6 included in the battery system 100 according to the first embodiment.
  • the protection circuit 4 will be described below assuming that the protection circuit 4 has the same configuration as the protection circuit 6 in order to simplify the circuit configuration.
  • the protection circuit 6 has a configuration in which a first circuit 11 in which a switch SW1 and a load resistor 10 are connected in series and a second circuit 12 made up of only the switch SW2 are connected in parallel.
  • the switches SW1 and SW2 are configured to be switchable on / off based on a control signal from the controller 30.
  • the resistance value in each protection circuit 6 can be variably switched between zero and a predetermined resistance value.
  • the load resistor 10 is a fixed resistance element having a predetermined resistance value.
  • the predetermined resistance value is set such that when the output current value between the series units 1 varies, power is consumed by the additional resistor 10 in a line having a large current value, and the current value is reduced. Suppresses variation.
  • a fixed resistor is used as the load resistor 10, but a variable resistor, a DC / DC converter, or the like may be used instead.
  • the resistance value can be variably adjusted, it is possible to suppress the variation in the current value between the series units 1 with higher accuracy.
  • FIG. 3 is a flowchart showing the control contents of the protection circuit 4 by the controller 30.
  • the protection circuit 4 is set so that the switch SW1 is OFF and SW2 is ON, and the output voltage from the series unit 1 side is applied to the inverter 7 side as it is.
  • the controller 30 acquires the voltage value (voltage value of the output terminal of the power supply circuit 2) V on the line connecting the protection circuit 4 and the inverter 7 from the voltmeter 8 (step S101). Then, the controller 30 determines whether or not the acquired voltage value V is greater than a preset threshold value V1 (step S102). When the voltage value V is larger than the preset threshold value V1 (step S102: YES), that is, when the voltage value V is increased due to an excessive inrush current, the controller 30 switches the switch SW1 in the protection circuit 4 to a value. By switching ON and SW2 to OFF, the output current from the series unit 1 side is consumed by the fixed resistor 10, and the inrush current is reduced.
  • step S102 the controller 30 returns the process to step S102, and when the voltage value V becomes equal to or lower than the preset threshold value V1 (step S102: NO), that is, when the excessive inrush current is settled, the switch SW1 in the protection circuit 4 Is turned OFF and SW2 is turned ON to return to the initial state.
  • the protection circuit 4 protects the load side from an excessive inrush current generated when the battery system 100 is started.
  • FIG. 4 is a flowchart showing the control contents of the protection circuit 6 by the controller 30. Similar to the protection circuit 4, in the protection circuit 6 in the initial state, the switch SW1 is set to OFF and the switch SW2 is set to ON.
  • the controller 30 acquires the current value I output from each series unit 1 from each ammeter 9 (step S201). Then, the controller 30 determines whether or not each acquired current value I is smaller than a preset threshold value I1 (step S202).
  • the threshold value I1 is a value defined in advance as the specification of the series unit 1 as a threshold value for determining that the output current value from the series unit 1 has decreased due to the progress of deterioration, and is experimental and theoretical. Alternatively, it may be set by various simulation methods.
  • the controller 30 sets the switch SW1 of the protection circuit 6 connected to the output side of the series unit 1 whose current value I is smaller than the threshold value I1 to OFF and SW2 to ON (step S203).
  • the switch SW1 of the protection circuit 6 connected to the output side is set to ON and SW2 is set to OFF (step S204).
  • Such switching control of the switches SW1 and SW2 by the controller 30 may be repeated by acquiring the input current value to the protection circuit 6 periodically or irregularly.
  • the load resistor 8 is described as a fixed resistor.
  • the variable resistor is used, and the variation in the current value is eliminated or reduced according to the current value input to each series unit 1 acquired by the controller.
  • the resistance value may be variably controlled.
  • a capacitor 13 is connected in parallel with the fixed resistor 10.
  • the battery cell since the battery cell mainly generates electric power by a chemical reaction, it may be difficult to output sufficient electric power necessary for the electric motor 3 that is a load at the time of starting. Even in such a case, by providing the capacitor 13, the power stored in the capacitor 13 in advance when the battery system 100 is started can be used to quickly supply power in response to a request from the load side. it can.
  • FIG. 6 shows another modification of the protection circuit 6.
  • a third circuit 14 in which a switch SW3 and a fixed resistor 13 are connected in series is provided.
  • the resistance value of the fixed resistor 13 may be set to be different from that of the fixed resistor 10 in the first circuit 11.
  • the resistance value in the protection circuit 6 can be adjusted in multiple steps by switching the switches SW1 to SW3 by the controller 30, so that the variation in the current value between the series units 1 can be performed more accurately.
  • the switching control of the switches SW1 to SW3 may be performed following the example described above with reference to FIG.
  • FIG. 7 is a block diagram showing the overall configuration of the battery system 100 according to the second embodiment.
  • parts common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.
  • one of the plurality of series units 1 included in the power supply circuit 2 is the main series unit 1a, and the other slave series units 1b and 1c are used.
  • the output power from the main series unit 1a is basically supplied to the required power on the load side, and when the required power is insufficient, the power is supplemented from the slave series units 1b and 1c as needed. There is a feature in the point to supply.
  • a DC / DC converter is particularly employed as the protection circuit 6.
  • the output voltage value of the DC / DC converter is controlled based on a control signal from the controller 30 so that the voltage value V acquired from the voltmeter 8 becomes a predetermined value V2.
  • the DC / DC converter can adjust the output voltage value more flexibly based on a control signal from the controller 30.
  • the present invention can be used for a battery system having a power circuit in which a plurality of series units each having a plurality of secondary battery cells connected in series are connected in parallel.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente invention se rapporte à un système de cellule électrique (100) qui comprend un circuit d'alimentation électrique (2), dans lequel n éléments série (1), où des cellules de batterie sont raccordées en série, sont raccordés en parallèle ; et transmet un courant au côté charge (3) au moyen d'un premier circuit de protection (4) et d'un onduleur (7) agencés en série par rapport à une borne de sortie du circuit d'alimentation électrique (2). En particulier, la présente invention est caractérisée en ce qu'elle est pourvue de (n - 1) circuits de protection (6) dont la résistance peut être commandée de façon variable, les circuits de protection étant raccordés en série entre les électrodes positives des n éléments série (1) raccordés en parallèle.
PCT/JP2012/051894 2011-02-14 2012-01-27 Système de cellule électrique Ceased WO2012111410A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-028339 2011-02-14
JP2011028339A JP5517965B2 (ja) 2011-02-14 2011-02-14 電池システム

Publications (1)

Publication Number Publication Date
WO2012111410A1 true WO2012111410A1 (fr) 2012-08-23

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PCT/JP2012/051894 Ceased WO2012111410A1 (fr) 2011-02-14 2012-01-27 Système de cellule électrique

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JP (1) JP5517965B2 (fr)
WO (1) WO2012111410A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104682705A (zh) * 2015-02-13 2015-06-03 华为技术有限公司 一种直流-直流双向变换电路和供电电源
EP3270455A1 (fr) * 2016-07-14 2018-01-17 GE Energy Power Conversion Technology Limited Système de stockage de batterie avec inverseur intégré
US10777863B2 (en) 2016-07-14 2020-09-15 Ge Energy Power Conversion Technology Ltd Battery storage system with integrated inverter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102890099B1 (ko) * 2022-02-18 2025-11-21 컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드 에너지 저장 시스템

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003189496A (ja) * 2001-12-12 2003-07-04 Mitsubishi Heavy Ind Ltd 電力貯蔵システム及びその充放電制御方法
JP2008118790A (ja) * 2006-11-06 2008-05-22 Hitachi Ltd 電源制御装置
WO2010018644A1 (fr) * 2008-08-13 2010-02-18 三菱重工業株式会社 Système de stockage d'électricité
WO2010067735A1 (fr) * 2008-12-09 2010-06-17 三菱重工業株式会社 Dispositif d’égalisation de tension, procédé, programme et système d’accumulation d’énergie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003189496A (ja) * 2001-12-12 2003-07-04 Mitsubishi Heavy Ind Ltd 電力貯蔵システム及びその充放電制御方法
JP2008118790A (ja) * 2006-11-06 2008-05-22 Hitachi Ltd 電源制御装置
WO2010018644A1 (fr) * 2008-08-13 2010-02-18 三菱重工業株式会社 Système de stockage d'électricité
WO2010067735A1 (fr) * 2008-12-09 2010-06-17 三菱重工業株式会社 Dispositif d’égalisation de tension, procédé, programme et système d’accumulation d’énergie

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104682705A (zh) * 2015-02-13 2015-06-03 华为技术有限公司 一种直流-直流双向变换电路和供电电源
CN104682705B (zh) * 2015-02-13 2017-06-20 华为技术有限公司 一种直流‑直流双向变换电路和供电电源
EP3270455A1 (fr) * 2016-07-14 2018-01-17 GE Energy Power Conversion Technology Limited Système de stockage de batterie avec inverseur intégré
US10777863B2 (en) 2016-07-14 2020-09-15 Ge Energy Power Conversion Technology Ltd Battery storage system with integrated inverter

Also Published As

Publication number Publication date
JP5517965B2 (ja) 2014-06-11
JP2012170209A (ja) 2012-09-06

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