WO2015011801A1 - Dispositif de surveillance de système de batterie - Google Patents

Dispositif de surveillance de système de batterie Download PDF

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Publication number
WO2015011801A1
WO2015011801A1 PCT/JP2013/070047 JP2013070047W WO2015011801A1 WO 2015011801 A1 WO2015011801 A1 WO 2015011801A1 JP 2013070047 W JP2013070047 W JP 2013070047W WO 2015011801 A1 WO2015011801 A1 WO 2015011801A1
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WO
WIPO (PCT)
Prior art keywords
cell
diagnosis
battery system
controller
voltage
Prior art date
Application number
PCT/JP2013/070047
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English (en)
Japanese (ja)
Inventor
彰彦 工藤
睦 菊地
金井　友範
寛 岩澤
光 三浦
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to JP2015528063A priority Critical patent/JP6174146B2/ja
Priority to PCT/JP2013/070047 priority patent/WO2015011801A1/fr
Publication of WO2015011801A1 publication Critical patent/WO2015011801A1/fr

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    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • 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
    • 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
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/005—Detection of state of health [SOH]
    • 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 battery system monitoring device.
  • a hybrid vehicle HEV
  • EV electric vehicle
  • An assembled battery (battery system)
  • SOC state of Charge
  • a battery controller that manages a battery pack by providing a cell controller that performs balancing discharge for equalizing (balancing) the remaining capacity in the battery pack monitoring device is known (see Patent Document 1).
  • the cell controller As described above, it is necessary to diagnose various parts related to the measurement of the cell voltage in order to determine whether or not the measurement of the cell voltage is correctly performed.
  • the diagnosis time required for these diagnoses and the operating conditions of the assembled battery differ depending on the contents of diagnosis and are not the same. Therefore, it is necessary to perform a plurality of types of diagnosis necessary for measuring the cell voltage at the optimum timing for each.
  • the battery system monitoring apparatus is connected to a battery system including one or more cell groups in which a plurality of single battery cells are connected in series, and monitors the state of each single battery cell of the battery system.
  • the cell controller is provided for each cell group and measures the cell voltage of each single battery cell of the cell group, and a battery controller connected to the cell controller.
  • the cell controller can execute a first diagnosis related to cell voltage measurement and a second diagnosis related to cell voltage measurement different from the first diagnosis.
  • the cell controller is periodically started and stopped after executing the first diagnosis.
  • the cell controller executes the second diagnosis. .
  • the present invention it is possible to carry out a plurality of types of diagnosis necessary for measuring the cell voltage at the optimum timing for each.
  • FIG. 1 It is a figure which shows the structure of the battery system monitoring apparatus by one Embodiment of this invention. It is explanatory drawing of the structure which starts a cell controller when charging / discharging of a battery system is a halt condition. It is a block diagram which shows the structure of the cell controller regarding the measurement of a cell voltage. It is a figure which shows an example of the timing of the diagnostic operation
  • the present invention is applied to a battery system monitoring device that monitors a battery system used in a hybrid vehicle (HEV) or the like.
  • the application range of the battery system monitoring device according to the present invention is not limited to monitoring the battery system mounted on the HEV.
  • the present invention can be widely applied to devices that monitor battery systems mounted on plug-in hybrid vehicles (PHEV), electric vehicles (EV), railway vehicles, and the like.
  • PHEV plug-in hybrid vehicles
  • EV electric vehicles
  • railway vehicles and the like.
  • a predetermined output voltage range for example, 3.0 to 4.2 V (average output voltage: 3.V) is set as the minimum unit of the battery system to be controlled and monitored by the battery system monitoring apparatus according to the present invention.
  • a lithium ion battery having an output voltage range of 6V) is assumed.
  • the battery system monitoring apparatus according to the present invention may control and monitor a battery system configured using a power storage / discharge device other than a lithium ion battery.
  • SOC State Of Charge
  • the battery system can be configured using any storage / discharge device. May be.
  • the electricity storage / discharge device as a component of such a battery system is generically referred to as a single battery cell.
  • a plurality of (approximately several to a dozen) battery cells connected in series are called cell groups, and a plurality of cell groups connected in series are called battery systems. It is out. These may be collectively referred to as an assembled battery.
  • FIG. 1 is a diagram showing a configuration of a battery system monitoring apparatus 10 according to an embodiment of the present invention.
  • the battery system monitoring apparatus 10 includes a battery controller 200 and a plurality of cell controllers 100 connected to each other according to a predetermined communication order.
  • the battery system monitoring device 10 is mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle together with the vehicle controller 400, the motor controller 300, the battery system 130, the inverter 340, the motor 350, and the like.
  • the battery system 130 has a plurality of cell groups 120 connected in series.
  • Each cell group 120 is configured by connecting a plurality of single battery cells 110 (hereinafter also simply referred to as cells) in series.
  • a secondary battery such as a lithium ion battery is used.
  • a loop communication circuit is provided between the battery controller 200 and each cell controller 100.
  • the battery controller 200 transmits a communication signal via the insulating element 21 to the highest cell controller 100 in the communication order.
  • the highest-level cell controller 100 transfers the communication signal to the cell controller 100 that is one order lower in the communication order.
  • communication signals are transmitted in series from the highest cell controller 100 to the lowest cell controller 100 in order.
  • the lowest cell controller 100 in the communication order transmits a communication signal to the battery controller 200 via the insulating element 22. In this manner, communication signals are exchanged between the battery controller 200 and each cell controller 100 via the loop communication circuit.
  • the vehicle controller 400 determines the vehicle running speed, braking / driving force, and the like based on an operation signal from a vehicle driving operation device (not shown) such as an accelerator pedal, a brake pedal, or a shift lever operated by a driver of the electric vehicle. Control.
  • Motor controller 300 controls battery controller 200 and inverter 340 based on the speed command and braking / driving force command from vehicle controller 400 to control the rotational speed and torque of motor 350.
  • Battery controller 200 controls charging / discharging and SOC (State Of Charge) of battery system 130 based on the voltage, current, and temperature of battery system 130 detected by voltage sensor 210, current sensor 220, and temperature sensor 230, respectively. .
  • the battery controller 200 controls the operation of each cell controller 100 by exchanging communication signals with each cell controller 100 as described above, and configures each cell group 120 in the battery system 130.
  • the SOC of each cell 110 is estimated. Based on this estimation result, a discharge (hereinafter referred to as balancing discharge) for correcting the variation in SOC between the cells 110 is performed so that the SOC of each cell 110 does not become non-uniform. In this way, the battery system monitoring device 10 monitors and controls the battery system 130.
  • the battery controller 200 When the communication signal is exchanged with each cell controller 100 as described above, the battery controller 200 outputs an activation signal (not shown) to each cell controller 100 before that. 100 is activated.
  • the activation signal is output via a signal path different from the communication signal. And if it confirms that each cell controller 100 started, transmission of a communication signal will be started.
  • the battery system 130 an assembled battery in which a plurality of cell groups 120 in which four cells 110 are connected in series is connected in series is illustrated.
  • the number of cells 110 constituting the cell group 120 is not limited to this, and may be less than four or four or more.
  • the battery system 130 may be configured by one cell group 120.
  • an electric vehicle such as an electric vehicle or a hybrid vehicle
  • many cells or cell groups are connected in series and parallel, and a high-voltage, high-capacity battery module having a voltage at both ends of about several hundred volts is generally used.
  • the present invention can also be applied to such a high voltage, high capacity battery module.
  • the cell controller 100 is provided for each cell group 120 in which a plurality of cells 110 constituting the battery system 130 are grouped into a predetermined number (four in FIG. 1). For example, when 100 cells 110 are connected in series in the battery system 130 and are divided into groups of 4 cells, 25 cell groups 120 are provided in the battery system 130, and 25 cells are provided accordingly.
  • the cell controller 100 is disposed in the battery system monitoring apparatus 10.
  • Each cell controller 100 measures the cell voltage by detecting the voltage between the positive and negative terminals for each cell 110 constituting the corresponding cell group 120, and transmits it to the battery controller 200.
  • the battery controller 200 estimates the SOC of each cell 110 based on the measurement result of the cell voltage of each cell 110 transmitted from each cell controller 100 and outputs a balancing command to each cell controller 100.
  • Each cell controller 100 performs energization control of the balancing current for each cell 110 in accordance with the balancing command from the battery controller 200.
  • a balancing resistor 23 for determining a balancing current is provided for each cell 110 between each cell controller 100 and the corresponding cell group 120.
  • the DC power charged in the battery system 130 is supplied to the smoothing capacitor 330 and the inverter 340 via the positive electrode side contactor 310 and the negative electrode side contactor 320.
  • the inverter 340 converts the DC power supplied from the battery system 130 into AC power and applies it to the motor 350.
  • the motor 350 is driven using this AC power.
  • the inverter 340 is provided with a switching element (not shown), and switching from DC power to AC power is performed by switching the switching element.
  • AC power generated by the motor 350 is converted into DC power by a diode element (not shown) provided in the inverter 340 and the smoothing capacitor 330.
  • This DC power is applied to the battery system 130 through the positive electrode side contactor 310 and the negative electrode side contactor 320, and the battery system 130 is charged. In this way, direct-current power is exchanged between the battery system 130 and the inverter 340.
  • ripple noise and switching noise are generated as the inverter 340 operates. These noises are reduced to some extent by the smoothing capacitor 330, but cannot be completely removed and flow into the battery system 130 to generate noise current. In proportion to the noise current, the noise voltage is superimposed on the voltage between the terminals of each cell 110 in the battery system 130. Since this noise becomes a detection error of the cell voltage, input to the cell controller 100 is suppressed by using a cell voltage input circuit unit 40 (not shown in FIG. 1) of FIG. 3 described later.
  • the battery system monitoring apparatus 10 having the above-described configuration periodically executes a diagnosis related to the measurement of the cell voltage by the cell controller 100 when the key switch of the electric vehicle is off and the charging / discharging of the battery system 130 is stopped. To do. A detailed description of this point will be given below.
  • FIG. 2 is an explanatory diagram of a configuration in which the cell controller 100 is activated when charging / discharging of the battery system 130 is in a stopped state in order to make a diagnosis related to measurement of the cell voltage.
  • the battery system 130 is comprised by the two cell groups 120a and 120b, and the cell controller 100a and 100b are connected to each, and the example is shown.
  • the number of cell groups constituting the battery system 130 and the number of cell controllers provided corresponding thereto are not limited to this.
  • the battery controller 200 includes a main control circuit 201, a real time clock 202, an internal switch 203, and a diode 204.
  • the main control circuit 201 is activated and starts operating when power is supplied from the lead storage battery 32 by turning on the main switch 31 or the internal switch 203 provided outside the battery controller 200.
  • the main switch 31 is turned on or off in conjunction with a key switch of the electric vehicle, and is also connected to other devices in the electric vehicle, such as the motor controller 300 and the vehicle controller 400 of FIG.
  • the real-time clock 202 is always supplied with power from the lead storage battery 32 regardless of the state of the main switch 31.
  • the real-time clock 202 periodically turns on the internal switch 203 to activate the main control circuit 201 every predetermined set time.
  • the diode 204 is for preventing power from being supplied from the lead storage battery 32 to other devices connected to the main switch 31 when the internal switch 203 is turned on.
  • the main control circuit 201 executes a predetermined activation process, and then sends the power to the cell controllers 100a and 100b. In response to this, an activation signal is transmitted.
  • the activation signal is received from the main control circuit 201, the cell controllers 100a and 100b are activated and become operational.
  • the main control circuit 201 transmits a signal for issuing an operation command to the cell controllers 100a and 100b. This signal is transmitted from the main control circuit 201 to the cell controller 100a, and is transmitted from the cell controller 100a to the cell controller 100b.
  • the cell controllers 100a and 100b measure the cell voltages of the respective cells 110 of the cell groups 120a and 120b in response to the operation command from the main control circuit 201, and transmit the measurement results. This signal is transmitted from the cell controller 100a to the cell controller 100b, and is transmitted from the cell controller 100b to the main control circuit 201.
  • the main control circuit 201 When the main switch 31 is turned off in accordance with the key switch of the electric vehicle and the power supply from the lead storage battery 32 is cut off, the main control circuit 201 outputs a stop signal to the real-time clock 202 and then stops its operation. When receiving the stop signal from the main control circuit 201, the real-time clock 202 measures the time after receiving the stop signal.
  • the real-time clock 202 turns on the internal switch 203 so that the power from the lead storage battery 32 is supplied to the main control circuit 201.
  • the main control circuit 201 is activated to be in an operating state, and transmits an activation signal to the cell controllers 100a and 100b in the same manner as the battery system 130 is being charged and discharged.
  • the activation signal is received from the main control circuit 201, the cell controllers 100a and 100b are activated and become operational.
  • the main control circuit 201 transmits a signal for instructing the cell controllers 100a and 100b to execute diagnosis related to measurement of the cell voltage. Upon receiving this signal, the cell controllers 100a and 100b execute a predetermined diagnosis relating to the measurement of the cell voltage.
  • the main control circuit 201 When it is confirmed that the cell controllers 100a and 100b are activated and the diagnosis is started, the main control circuit 201 outputs a stop signal to the real-time clock 202 and then performs an operation in the same manner as when the main switch 31 is turned off. Stop.
  • the real-time clock 202 When receiving the stop signal from the main control circuit 201, the real-time clock 202 restarts the time measurement after receiving the stop signal, and waits until the measurement time reaches the set time next time.
  • the cell controllers 100a and 100b store the diagnosis result and stop the operation.
  • This diagnosis result is transmitted from the cell controllers 100a and 100b to the main control circuit 201 when the main switch 31 is turned on next and charging / discharging of the battery system 130 is started.
  • the main control circuit 201 When the diagnosis result received from the cell controllers 100a and 100b indicates that an abnormality has occurred, the main control circuit 201 notifies the occurrence of an abnormality with respect to the measurement of the cell voltage.
  • the notification of the occurrence of the abnormality can be performed by transmitting information indicating the occurrence of the abnormality from the battery controller 200 to the vehicle controller 400, for example.
  • the vehicle controller 400 When such information is received from the battery controller 200, the vehicle controller 400 notifies the driver of the electric vehicle of the occurrence of abnormality by turning on a warning lamp (not shown) provided in the vehicle, for example.
  • the transmission of information from the battery controller 200 to the vehicle controller 400 may be performed via wireless communication such as wireless LAN, or wired communication such as CAN (Controller Area Network) disposed in the vehicle. You may go through.
  • FIG. 3 is a block diagram showing a configuration of the cell controller 100 related to cell voltage measurement.
  • the cell controller 100 shown in FIG. 3 is connected to voltage detection lines SL1 to SL5 connected to each cell 110 of the cell group 120.
  • Balancing lines BL1 to BL5 for flowing a balancing current during the aforementioned balancing discharge are connected to the voltage detection lines SL1 to SL5.
  • a cell voltage input circuit unit 40 is provided between the cell controller 100 and the cell group 120.
  • the cell voltage input circuit unit 40 is for removing noise in the voltage detection lines SL1 to SL5, and is configured by an RC filter using a resistor and a capacitor. Note that the balancing resistor 23 of FIG. 1 provided in the balancing lines BL1 to BL5 may be included in the cell voltage input circuit unit 40.
  • the cell controller 100 includes a cell voltage selection unit 101, a cell voltage detection unit 102, a control circuit unit 103, a storage unit 104, a communication control unit 105, and a balancing switch 106.
  • the cell voltage selection unit 101 is for selecting a cell 110 that is a cell voltage measurement target from each cell 110 of the cell group 120, and is configured using, for example, a multiplexer.
  • the selection operation of the cell 110 by the cell voltage selection unit 101 is controlled by the control circuit unit 103.
  • the cell voltage detection unit 102 is for detecting the cell voltage of the cell 110 selected as the cell voltage measurement target by the cell voltage selection unit 101, and is configured using, for example, an AD conversion circuit or an amplification circuit. Yes.
  • the detection result of the cell voltage by the cell voltage detection unit 102 is output to the control circuit unit 103.
  • the control circuit unit 103 controls the selection operation of the cell voltage selection unit 101 and sequentially selects each cell 110 of the cell group 120, thereby acquiring the cell voltage detection result for each cell 110 from the cell voltage detection unit 102. .
  • the detection result of the cell voltage is output from the control circuit unit 103 to the communication control unit 105. Further, based on the obtained detection result of the cell voltage, a diagnosis relating to the measurement of the cell voltage is performed, and information indicating the diagnosis result is output to the storage unit 104. The details of this diagnosis will be described later.
  • the storage unit 104 is a non-volatile storage element for storing information on the diagnosis result output from the control circuit unit 103, and is configured using, for example, a flash memory.
  • the information on the diagnosis result stored in the storage unit 104 is read out by the control circuit unit 103 and output to the communication control unit 105 when charging / discharging of the battery system 130 is started.
  • the communication control unit 105 transmits this information to the battery controller 200. Thereby, based on the information stored in the storage unit 104, the diagnosis result by the cell controller 100 is transmitted from the cell controller 100 to the battery controller 200.
  • the communication control unit 105 is a part that performs communication control for transmitting various types of information output from the control circuit unit 103 to the battery controller 200 and receiving information transmitted from the battery controller 200.
  • Information received from the battery controller 200 is output from the communication control unit 105 to the control circuit unit 103 and used in control performed by the control circuit unit 103.
  • the communication control performed by the communication control unit 105 the cell voltage detection result and the diagnosis result relating to the cell voltage measurement are transmitted from the cell controller 100 to the battery controller 200.
  • Various commands from the battery controller 200 are received by the cell controller 100.
  • the balancing switch 106 is used to control the supply of a balancing current to each cell 110 of the cell group 120, and is connected to the balancing lines BL1 to BL5.
  • the balancing switch 106 is configured by switches provided between the balancing lines adjacent to each other in the balancing lines BL1 to BL5. The operation of each switch of the balancing switch 106 is controlled by the control circuit unit 103 in accordance with a balancing command from the battery controller 200.
  • the cell controller 100 executes the following diagnoses (a) to (e) as the diagnosis relating to the measurement of the cell voltage.
  • the cell controller 100 diagnoses whether or not the voltage detection lines SL1 to SL5 are normally connected as one of the diagnosis relating to the measurement of the cell voltage. Specifically, the resistance values of the voltage detection lines SL1 to SL5 are respectively measured, and based on the measurement results, it is diagnosed whether or not the connection state of the voltage detection lines SL1 to SL5 is normal.
  • the resistance values of the voltage detection lines SL1 to SL5 are controlled based on, for example, the measured value of the cell voltage of each cell 110 during balancing discharge and the measured value of the cell voltage of each cell 110 when the balancing discharge is stopped. It can be calculated by the circuit unit 103. If any one of the resistance values of the voltage detection lines SL1 to SL5 calculated in this way is larger than a specified value, it can be diagnosed that the connection state of the voltage detection line is abnormal.
  • the cell controller 100 diagnoses whether the cell voltage input circuit unit 40 is normal as one of the diagnoses related to cell voltage measurement. Specifically, voltage drop in the cell voltage input circuit unit 40 is measured for each of the voltage detection lines SL1 to SL5, and the presence or absence of leakage in the cell voltage input circuit unit 40 is diagnosed based on the measurement result. Regarding the voltage drop in the cell voltage input circuit section 40 of the voltage detection lines SL1 to SL5, for example, a switch is provided between each voltage detection line SL1 to SL5 and each balancing line BL1 to BL5, and each switch is turned on and off. It can be obtained by comparing the measured values of the cell voltage of each cell 110 at the time. If any one of the voltage drops of the voltage detection lines SL1 to SL5 obtained in this way is larger than a specified value, an abnormal voltage drop due to leakage occurs in the cell voltage input circuit section for the voltage detection line. 40 can be diagnosed as occurring.
  • the cell controller 100 diagnoses whether or not the cell voltage selection unit 101 is normal as one of the diagnoses related to cell voltage measurement. Specifically, the cell voltage of each cell 110 of the cell group 120 when the input voltage to the cell voltage selection unit 101 is changed is measured, and the selection operation of the cell voltage selection unit 101 is normal based on the measurement result. Diagnose whether or not.
  • the change in the input voltage to the cell voltage selection unit 101 is, for example, by switching between adjacent voltage detection lines SL1 to SL5 in the portion where the voltage detection lines SL1 to SL5 are input to the cell voltage selection unit 101. Each can be provided and turned on and off.
  • one of the cell voltages matches the change of the input voltage. If there is no change, it can be diagnosed that an abnormality has occurred in the selection operation of the cell voltage selection unit 101.
  • the cell controller 100 diagnoses whether or not the detection characteristics in the cell voltage detection unit 102 are normal as one of the diagnoses related to the measurement of the cell voltage. Specifically, a voltage source that generates a voltage that continuously changes within a predetermined range is provided in the cell controller 100, and the voltage from the voltage source is detected by the cell voltage detection unit 102, and based on the detection result. Thus, it is diagnosed whether or not the detection characteristics of the cell voltage detector 102 are normal. If any part of the voltage detection result from the voltage source by the cell voltage detection unit 102 is discontinuous, one of the components of the cell voltage detection unit 102, for example, the AD converter circuit is not operating normally. Therefore, it can be diagnosed that an abnormality has occurred in the detection characteristics of the cell voltage detector 102.
  • the cell controller 100 diagnoses whether or not the detection error in the cell voltage detection unit 102 is normal as one of the diagnoses related to the measurement of the cell voltage. Specifically, a voltage source that generates a known predetermined reference voltage is provided in the cell controller 100, the reference voltage from this voltage source is detected by the cell voltage detection unit 102, and based on the detection result, It is diagnosed whether or not the detection error of the cell voltage detection unit 102 is normal. In the detection result of the reference voltage by the cell voltage detection unit 102, if the error is larger than the specified value, one of the components of the cell voltage detection unit 102, for example, the amplifier circuit is not operating normally. It can be diagnosed that an abnormality has occurred in the detection error of the detection unit 102.
  • the diagnoses (a) to (e) described above are diagnoses that require that the cell voltage fluctuations be stable during the diagnosis.
  • the cell voltage fluctuates in accordance with the change in the charging / discharging state, so it is difficult to execute these diagnoses. Therefore, these diagnoses are preferably executed in the cell controller 100 when charging / discharging of the battery system 130 is stopped.
  • each diagnosis (a) to (d) is a diagnosis that requires a relatively long diagnosis time, for example, a diagnosis time of several tens of seconds or more. . It is difficult to perform these diagnoses during charging / discharging of the battery system 130 or when charging / discharging of the battery system 130 is started by turning on the key switch of the vehicle. Therefore, these diagnoses are also preferably executed in the cell controller 100 when the charging / discharging of the battery system 130 is stopped.
  • diagnosis of (e) is performed in the cell controller 100 during charging / discharging of the battery system 130.
  • the cell controller 100 is periodically started up according to the above-described procedure, executes each diagnosis (a) to (d), and then stops. .
  • these diagnoses are referred to as first diagnoses.
  • the cell controller 100 executes the diagnosis of (e) at every predetermined timing while the battery system 130 is being charged / discharged.
  • this diagnosis is referred to as a second diagnosis.
  • FIG. 4 is a diagram illustrating an example of the timing of the diagnostic operation in the cell controller 100.
  • the upper diagram shows the charging / discharging timing of the battery system 130
  • the middle diagram shows the timing of the diagnostic operation in the cell controller 100
  • the lower diagram shows the lead storage battery 32 connected to the battery controller 200. Timing is shown.
  • the lead storage battery 32 When the lead storage battery 32 is connected to the battery controller 200 at time t1, an activation signal is transmitted from the battery controller 200 to the cell controller 100, and the cell controller 100 is activated. At this time, the cell controller 100 executes the first diagnosis. When the first diagnosis is completed at time t2, the cell controller 100 stores the diagnosis result in the storage unit 104 and then stops the operation.
  • the real-time clock 202 turns on the internal switch 203 to activate the battery controller 200 at time t3.
  • an activation signal is transmitted from the battery controller 200 to the cell controller 100, and the cell controller 100 is activated.
  • the cell controller 100 executes the first diagnosis.
  • the cell controller 100 stores the diagnosis result in the storage unit 104 and then stops the operation.
  • the battery controller 200 is started by turning on the main switch 31 accordingly. Thereby, an activation signal is transmitted from the battery controller 200 to the cell controller 100, and the cell controller 100 is activated. At this time, the cell controller 100 executes the second diagnosis.
  • the battery controller 200 stops its operation.
  • the cell controller 100 executes the first diagnosis.
  • the cell controller 100 stores the diagnosis result in the storage unit 104 and then stops the operation.
  • the real-time clock 202 turns on the internal switch 203 to activate the battery controller 200 at time t8. Thereby, an activation signal is transmitted from the battery controller 200 to the cell controller 100, and the cell controller 100 is activated. Also at this time, the cell controller 100 executes the first diagnosis. When the first diagnosis is completed at time t9, the cell controller 100 stores the diagnosis result in the storage unit 104 and then stops the operation.
  • the cell controller 100 repeatedly executes the diagnosis as described above according to the charge / discharge state of the battery system 130. That is, when charging / discharging of the battery system 130 is stopped, the battery system 130 is periodically started and stopped after executing the first diagnosis, and when the battery system 130 is charging / discharging, the second diagnosis is executed. Moreover, if charging / discharging of the battery system 130 is stopped, it will stop after performing a 1st diagnosis.
  • the battery system monitoring device 10 is connected to a battery system 130 including one or more cell groups 120 in which a plurality of single battery cells 110 are connected in series, and the state of each single battery cell 110 of the battery system 130 To monitor.
  • the battery system monitoring device 10 is provided for each cell group 120 and includes a cell controller 100 that measures the cell voltage of each single battery cell 110 in the cell group 120 and a battery controller 200 connected to the cell controller 100.
  • the cell controller 100 can execute a first diagnosis relating to cell voltage measurement and a second diagnosis relating to cell voltage measurement different from the first diagnosis, and when charging / discharging of the battery system 130 is stopped.
  • the cell controller 100 is periodically started and stopped after executing the first diagnosis, and the cell controller 100 executes the second diagnosis while the battery system 130 is being charged / discharged. Since it did in this way, the multiple types of diagnosis required for the measurement of a cell voltage can be implemented at the optimal timing for each.
  • the cell controller 100 executes, as the first diagnosis, a diagnosis that requires that the cell voltage is in a stable state and a diagnosis that requires a diagnosis time longer than a predetermined time. Since it did in this way, the diagnosis difficult to perform during charging / discharging of the battery system 130 can be performed when charging / discharging of the battery system 130 is a stop state.
  • the cell controller 100 is connected to the voltage detection lines SL1 to SL5 connected to the single cells 110 of the cell group 120, and between the cell controller 100 and the cell group 120 on the voltage detection lines SL1 to SL5. Is provided with a cell voltage input circuit section 40 having a resistor and a capacitor.
  • the cell controller 100 also includes a cell voltage selection unit 101 that selects a single battery cell 110 that is a cell voltage measurement target from the single battery cells 110 of the cell group 120, and a single battery cell that is selected by the cell voltage selection unit 101. And a cell voltage detection unit 102 for detecting 110 cell voltages.
  • the cell controller 100 executes diagnosis of the voltage detection lines SL1 to SL5, diagnosis of the cell voltage input circuit unit 40, diagnosis of the cell voltage selection unit 101, and diagnosis of detection characteristics in the cell voltage detection unit 102 as a first diagnosis,
  • the detection error diagnosis in the cell voltage detection unit 102 is executed as a second diagnosis. Since it did in this way, the diagnosis of the various site
  • the cell controller 100 measures the resistance values of the voltage detection lines SL1 to SL5, and diagnoses the voltage detection lines SL1 to SL5 based on the measurement result. Further, the voltage drop in the cell voltage input circuit unit 40 is measured, and the cell voltage input circuit unit 40 is diagnosed based on the measurement result. Further, the cell voltage of each single battery cell 110 when the input voltage to the cell voltage selection unit 101 is changed is measured, and the cell voltage selection unit 101 is diagnosed based on the measurement result. In addition, the voltage continuously changing in a predetermined range is detected by the cell voltage detection unit 102, and the detection characteristic in the cell voltage detection unit 102 is diagnosed based on the detection result. Further, a predetermined reference voltage is detected by the cell voltage detection unit 102, and a detection error in the cell voltage detection unit 102 is diagnosed based on the detection result. Since it did in this way, each diagnosis can be performed reliably.
  • the cell controller 100 further includes a nonvolatile storage unit 104.
  • the cell controller 100 stops after storing the information indicating the result of the first diagnosis in the storage unit 104, and based on the information stored in the storage unit 104 when charging / discharging of the battery system 130 is started. Then, the result of the first diagnosis is transmitted to the battery controller 200. Based on the result of the first diagnosis transmitted from the cell controller 100, the battery controller 200 notifies the occurrence of an abnormality with respect to the cell voltage measurement. As described above, when an abnormality occurs in the measurement of the cell voltage while the charging / discharging of the battery system 130 is stopped, the abnormality is detected when the key switch of the vehicle is turned on and charging / discharging of the battery system 130 is started. The occurrence can be reliably notified to the driver of the vehicle.
  • the battery controller 200 notifies the occurrence of an abnormality by transmitting information via wireless communication or wired communication. Since it did in this way, notification of abnormality generation can be performed in detail and easily.
  • the cell controller 100 stops after executing the first diagnosis. Since it did in this way, the 1st diagnosis can be further performed, without affecting the time after the key switch of a vehicle is turned on until it can run.
  • the example in which the cell controller 100 executes the diagnosis (a) to (d) as the first diagnosis and the diagnosis (e) as the second diagnosis has been described. It is not necessary to execute all of the diagnoses (a) to (d) as the first diagnosis, and at least one of them may be executed. Moreover, the diagnostic content performed as a 1st diagnosis and a 2nd diagnosis is not limited to this, You may perform another diagnosis.
  • the storage unit 104 stores the resistance values of the voltage detection lines SL1 to SL5 measured by these diagnoses and the history of voltage drop measurement results in the cell voltage input circuit unit 40.
  • the cell controller 100 may further determine the abnormal progress of the voltage detection lines SL1 to SL5 and the cell voltage input circuit unit 40 based on this history.
  • the cell controller 100 Determines that an abnormality is occurring in the voltage detection lines SL1 to SL5 and the cell voltage input circuit unit 40, and transmits information indicating the determination result to the battery controller 200.
  • the battery controller 200 notifies the vehicle driver of the abnormal progress with respect to the measurement of the cell voltage. In this way, when the abnormality is gradually progressing in the voltage detection lines SL1 to SL5 and the cell voltage input circuit unit 40, it is possible to notify the vehicle driver before they become completely abnormal. .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Medical Informatics (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Tests Of Electric Status Of Batteries (AREA)

Abstract

La présente invention porte sur un dispositif de surveillance de système de batterie qui comporte des dispositifs de commande d'élément qui sont fournis pour chaque groupe d'éléments et mesurent la tension d'élément de chaque unique élément de batterie dans un groupe d'éléments et ayant un dispositif de commande de batterie connecté aux dispositifs de commande d'élément. Les dispositifs de commande d'élément sont aptes à réaliser un premier diagnostic concernant une mesure de tension d'élément et un second diagnostic concernant une mesure de tension d'élément différant de celle du premier diagnostic. Lorsque la charge et la décharge d'un système de batterie est arrêtée, les dispositifs de commande d'élément démarrent régulièrement, réalisent le premier diagnostic et puis s'arrêtent, et durant la charge et la décharge du système de batterie, les dispositifs de commande d'élément réalisent le second diagnostic.
PCT/JP2013/070047 2013-07-24 2013-07-24 Dispositif de surveillance de système de batterie WO2015011801A1 (fr)

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JP2015528063A JP6174146B2 (ja) 2013-07-24 2013-07-24 電池システム監視装置
PCT/JP2013/070047 WO2015011801A1 (fr) 2013-07-24 2013-07-24 Dispositif de surveillance de système de batterie

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CN107407699B (zh) * 2015-03-11 2020-01-10 日立汽车***株式会社 电池管理装置、电池监视电路、控制***
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WO2019220804A1 (fr) * 2018-05-14 2019-11-21 三洋電機株式会社 Dispositif de gestion et système de stockage d'énergie
JPWO2019220804A1 (ja) * 2018-05-14 2021-06-17 三洋電機株式会社 管理装置、蓄電システム
JP7276892B2 (ja) 2018-05-14 2023-05-18 三洋電機株式会社 管理装置、蓄電システム
JP2021511505A (ja) * 2018-09-27 2021-05-06 エルジー・ケム・リミテッド Ｓｏｃ推定装置及び方法
JP2021019371A (ja) * 2019-07-17 2021-02-15 株式会社デンソー 電池制御装置
JP2022017305A (ja) * 2019-07-17 2022-01-25 株式会社デンソー 電池制御装置
JP7044097B2 (ja) 2019-07-17 2022-03-30 株式会社デンソー 電池制御装置

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