WO2014061153A1 - 組電池監視装置 - Google Patents
組電池監視装置 Download PDFInfo
- Publication number
- WO2014061153A1 WO2014061153A1 PCT/JP2012/077122 JP2012077122W WO2014061153A1 WO 2014061153 A1 WO2014061153 A1 WO 2014061153A1 JP 2012077122 W JP2012077122 W JP 2012077122W WO 2014061153 A1 WO2014061153 A1 WO 2014061153A1
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- WIPO (PCT)
- Prior art keywords
- power supply
- cell
- timer
- control unit
- monitoring device
- Prior art date
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 82
- 230000004913 activation Effects 0.000 claims description 96
- 238000005259 measurement Methods 0.000 claims description 29
- 230000004044 response Effects 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 description 85
- 238000010586 diagram Methods 0.000 description 26
- 238000000034 method Methods 0.000 description 24
- 238000012545 processing Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 15
- 238000001514 detection method Methods 0.000 description 12
- 230000005856 abnormality Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012805 post-processing Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
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- 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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
-
- 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
-
- 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
-
- 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
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- 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
- 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
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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 an apparatus for monitoring an assembled battery composed of a plurality of battery cells.
- Patent Document 1 discloses a technique for reducing power consumption during such cell balancing.
- CMOS timer IC corresponding to each battery cell is provided inside the battery control unit connected to the assembled battery, and communication is performed with the battery control unit.
- a timer is also provided in the system control unit that performs the above. By using these timers, only the minimum necessary capacity adjustment circuit is operated in the battery control unit during cell balancing to reduce power consumption.
- An assembled battery monitoring device monitors an assembled battery having one or a plurality of cell groups in which a plurality of battery cells are connected in series, and is provided corresponding to each cell group of the assembled battery.
- An integrated circuit unit that measures the voltage of each battery cell of the cell group and performs cell balancing to adjust the capacity of each battery cell of the cell group; and an integrated circuit unit that communicates with the integrated circuit unit
- a power supply unit that supplies power to the control unit.
- the control unit causes the integrated circuit unit to start or stop cell balancing in accordance with the supply of power from the power supply unit, and also sets a timer time for starting the power supply unit to stop the power supply unit from supplying power.
- the power supply unit starts up according to the timer time and starts supplying power.
- FIG. 1 is a diagram showing a configuration of an assembled battery monitoring device according to the first embodiment of the present invention.
- An assembled battery monitoring device 3 shown in FIG. 1 monitors an assembled battery 2 composed of cell groups GB1 to GB3 in which a plurality of battery cells 1 are connected in series.
- the assembled battery 2 the host system 12 and lead Connected to the storage battery 13.
- the assembled battery monitoring device 3 includes integrated circuit units 41 to 43, insulating elements 91 and 92, a communication interface 5, a control unit 6, a power supply unit 7, a timer starting circuit 8, and an OR logic input circuit 10. And a host communication interface 11.
- the assembled battery monitoring device 3 is mounted and used in a system that drives a motor using the electric power of the assembled battery 2, for example, a vehicle system such as an electric vehicle or a hybrid electric vehicle.
- the integrated circuit portions 41 to 43 are provided corresponding to the cell groups GB1 to GB3 of the assembled battery 2, and are connected to the battery cells 1 of the corresponding cell group. These integrated circuit portions 41 to 43 are connected to each other by daisy chain connection.
- the daisy chain connection of the integrated circuit units 41 to 43 is connected to the control unit 6 via the insulating elements 91 and 92 and the communication interface 5.
- the communication interface 5 functions as an interface for inputting / outputting communication signals between the control unit 6 and the integrated circuit units 41 to 43. Specifically, when a communication signal is output from the control unit 6, the communication interface 5 outputs the communication signal to the highest-order integrated circuit unit 41 through a daisy chain connection via the insulating element 91. Further, when a communication signal is output from the lowest integrated circuit unit 43 via the insulating element 92 in the daisy chain connection, the communication interface 5 outputs the communication signal to the control unit 6.
- a photocoupler or the like can be used for example.
- the uppermost integrated circuit unit 41 in the daisy chain connection receives a communication signal from the control unit 6 via the communication interface 5 and the insulating element 91, the communication signal is transmitted to the next communication rank, that is, the intermediate integrated circuit unit 42. Send to.
- the received communication signal includes command information for the integrated circuit unit 41, an operation corresponding to the content of the command information is executed.
- the operation performed by the integrated circuit unit 41 includes, for example, voltage measurement of each battery cell 1 of the corresponding cell group GB1, cell balancing for adjusting the remaining charge capacity of each battery cell 1, and the like.
- the integrated circuit unit 42 When the integrated circuit unit 42 receives the communication signal from the integrated circuit unit 41, the integrated circuit unit 42 transmits the communication signal to the next communication rank, that is, the lowest integrated circuit unit 43. At this time, similarly to the integrated circuit unit 41, when the received communication signal includes command information for the integrated circuit unit 42, an operation corresponding to the content of the command information is executed.
- the integrated circuit unit 43 When the integrated circuit unit 43 receives a communication signal from the integrated circuit unit 42, the integrated circuit unit 43 transmits the communication signal to the control unit 6 via the insulating element 92 and the communication interface 5. At this time, similarly to the integrated circuit units 41 and 42, when the received communication signal includes command information for the integrated circuit unit 43, an operation corresponding to the content of the command information is executed.
- communication can be performed between the control unit 6 and the integrated circuit units 41 to 43.
- the information such as the voltage measurement result of each battery cell 1 performed by the integrated circuit units 41 to 43 is controlled from the integrated circuit units 41 to 43 together with the communication signal or using the same communication procedure as the communication signal. It can be transmitted to the unit 6.
- the control unit 6 is a part for executing predetermined control processing and arithmetic processing, and is realized using, for example, a microcomputer. According to the processing executed in the control unit 6, the above communication is performed between the control unit 6 and the integrated circuit units 41 to 43, whereby the operation of the integrated circuit units 41 to 43 is performed from the control unit 6. Can be controlled. In addition, a timer setting signal can be output from the control unit 6 to the timer starting circuit 8, or an activation maintaining signal can be output from the control unit 6 to the power supply unit 7 via the OR logic input circuit 10. The control unit 6 is connected to the power supply unit 7 and operates by receiving power supplied from the power supply unit 7.
- the power supply unit 7 includes a main power supply circuit 71 for supplying power to the control unit 6 and the like when the assembled battery monitoring device 3 operates in the normal mode, and the assembled battery monitoring device 3 operates in the low power consumption mode.
- the power supply unit 7 is connected to the output side of the OR logic input circuit 10 and is switched to either the activated state or the activated / suspended state in accordance with the activation signal output from the OR logic input circuit 10.
- the start signal is output, the power supply unit 7 is in the start state, and power is supplied from the main power supply circuit 71 to the control unit 6 and the like using the power of the lead storage battery 13. Thereby, the assembled battery monitoring device 3 operates in the normal mode.
- the power supply unit 7 when the start signal is not output, the power supply unit 7 is in the start stop state, stops the power supply from the main power supply circuit 71, and supplies only the standby power supply from the standby power supply circuit 72 to the timer starter circuit 8 or the like. To do. Thereby, the assembled battery monitoring device 3 operates in the low power consumption mode.
- the standby power supply from the standby power supply circuit 72 is performed in both the normal mode and the low power consumption mode.
- the timer start circuit 8 is a circuit for starting the power supply unit 7 at a predetermined timing.
- the timer activation circuit 8 When a preset timer time elapses after the assembled battery monitoring device 3 starts operating in the low power consumption mode, the timer activation circuit 8 outputs a timer activation signal to the OR logic input circuit 10. As a result, an activation signal is output from the OR logic input circuit 10 to the power supply unit 7, the power supply unit 7 is activated, and the operation mode of the assembled battery monitoring device 3 is shifted from the low power consumption mode to the normal mode.
- Setting of the timer time for the timer starting circuit 8 is performed by a timer setting signal output from the control unit 6 during operation in the normal mode.
- timer starting circuit 8 two types of timer times can be set by the control unit 6. One of them is a timer time set in order to periodically perform cell balancing for each battery cell 1 of the assembled battery 2.
- timer time T1 By periodically starting the power supply unit 7 according to the timer time, the assembled battery monitoring device 3 periodically performs cell balancing, and each battery cell 1 of the assembled battery 2 during operation in the low power consumption mode. Variation of the remaining charge capacity can be prevented.
- this timer time T1 is referred to as “timer time T1”.
- the other is a timer time set to determine whether or not cell balancing of each battery cell 1 of the assembled battery 2 is completed.
- a timer time corresponding to the time required for the cell balancing is set for the timer activation circuit 8 and switched to the low power consumption mode.
- the assembled battery monitoring device 3 can determine whether or not the cell balancing is completed by starting the power supply unit 7 according to the timer time. In the following description, this timer time is referred to as “timer time T2”.
- the OR logic input circuit 10 When the OR logic input circuit 10 receives at least one of the activation maintenance signal from the control unit 6, the timer activation signal from the timer activation circuit 8, and the upper activation signal from the upper system 12, the OR logic input circuit 10 supplies the power supply unit 7. Output start signal. That is, one of these input signals is output from the OR logic input circuit 10 to the power supply unit 7 as an activation signal by OR output.
- the host communication interface 11 is a part that functions as an interface for inputting / outputting a host communication signal between the control unit 6 and the host system 12. That is, the control unit 6 can send and receive higher-level communication signals to and from the higher-level system 12 via the higher-level communication interface 11. Thereby, the assembled battery monitoring device 3 can be controlled from the host system 12 or the monitoring result of the assembled battery 2 by the assembled battery monitoring device 3 can be reported to the host system 12.
- the host system 12 is a vehicle system such as an electric vehicle or a hybrid electric vehicle, and includes a vehicle control device and the like.
- the host system 12 can output a host activation signal to the assembled battery monitoring device 3 as necessary.
- This upper activation signal is input to the OR logic input circuit 10 in the assembled battery monitoring device 3 as described above, and is output from the OR logic input circuit 10 to the power supply unit 7 as an activation signal.
- the host system 12 can start the power supply unit 7 at an arbitrary timing, and can cause the assembled battery monitoring device 3 to start the operation in the normal mode.
- the key switch signal of the vehicle can be used as the upper activation signal.
- FIG. 2 is a diagram illustrating an internal configuration of the integrated circuit unit 41. Although not described, the other integrated circuit units 42 and 43 have the same internal configuration.
- the cell group GB1 corresponding to the integrated circuit unit 41 includes four battery cells 1 as shown in FIG. In FIG. 2, these battery cells 1 are shown as battery cells BC1 to BC4, respectively.
- the positive terminal of the battery cell BC1 is connected to the input circuit 116 in the integrated circuit section 41 via the input terminal V1.
- the input circuit 116 includes a multiplexer.
- the negative terminal of the battery cell BC1 and the positive terminal of the battery cell BC2 are connected via the input terminal V2
- the negative terminal of the battery cell BC2 and the positive terminal of the battery cell BC3 are connected via the input terminal V3.
- the negative terminal of the cell BC3 and the positive terminal of the battery cell BC4 are respectively connected to the input circuit 116 via the input terminal V4.
- the negative terminal of the battery cell BC4 is connected to the terminal GND of the integrated circuit unit 41.
- the voltage detection circuit 122 has a circuit that converts the voltage between the terminals of each of the battery cells BC1 to BC4 into a digital value. Each terminal voltage converted to a digital value is sent to the IC control circuit 123 and held in the internal storage circuit 125. These voltages are used for self-diagnosis or transmitted to the control unit 6 in FIG.
- the IC control circuit 123 has an arithmetic function, and also includes a storage circuit 125 and a timing control circuit 252 for controlling timings for detecting various voltages and performing state diagnosis.
- the memory circuit 125 is constituted by a register circuit, for example.
- the inter-terminal voltages of the battery cells BC1 to BC4 detected by the voltage detection circuit 122 are stored in the memory circuit 125 in the IC control circuit 123 in association with the battery cells BC1 to BC4. Further, various other detection values can also be held in the memory circuit 125 so as to be readable at a predetermined address.
- a communication circuit 127 is connected to the IC control circuit 123.
- a communication signal transmitted from the control unit 6 to the integrated circuit unit 41 is input to the IC control circuit 123 via the communication circuit 127, and a communication signal output from the IC control circuit 123 is input to the next integrated circuit unit 42. Sent to.
- the IC control circuit 123 decodes the content of the command information included in the communication signal and performs a process corresponding thereto.
- the command information from the control unit 6 includes, for example, voltage measurement command information for each of the battery cells BC1 to BC4, cell balancing start command information for adjusting the state of charge of each of the battery cells BC1 to BC4, and the like.
- the positive terminal of the battery cell BC1 is connected to the terminal B1 via the resistor R1.
- a balancing switch 129A is provided between the terminal B1 and the terminal V2.
- the balancing switch 129A is connected in parallel with an operation state detection circuit 128A for detecting the operation state of the switch.
- the balancing switch 129A is controlled to be opened and closed by the discharge control circuit 132.
- the positive terminal of the battery cell BC2 is connected to the terminal B2 via the resistor R2, and a balancing switch 129B is provided between the terminal B2 and the terminal V3.
- the balancing switch 129B is connected in parallel with an operation state detection circuit 128B for detecting the operation state of the switch.
- the balancing switch 129A is controlled to be opened and closed by the discharge control circuit 132.
- the positive terminal of the battery cell BC3 is connected to the terminal B3 via the resistor R3, and a balancing switch 129C is provided between the terminal B3 and the terminal V4.
- the balancing switch 129C is connected in parallel with an operation state detection circuit 128C for detecting the operation state of the switch.
- the balancing switch 129C is controlled to open and close by the discharge control circuit 132.
- the positive terminal of the battery cell BC4 is connected to the terminal B4 via the resistor R4, and a balancing switch 129D is provided between the terminal B4 and the terminal GND.
- An operation state detection circuit 128D for detecting the operation state of the switch is connected in parallel to the balancing switch 129D.
- the balancing switch 129D is controlled to be opened and closed by the discharge control circuit 132.
- the operation state detection circuits 128A to 128D repeatedly detect the voltage across the corresponding balancing switches 129A to 129D at a predetermined period, and detect whether each balancing switch 129A to 129D is normal.
- the balancing switches 129A to 129D are switches that adjust the charging states of the battery cells BC1 to BC4. If these switches are abnormal, the state of charge of the battery cells cannot be controlled, and some battery cells may be overcharged or overdischarged. For example, even when a certain balancing switch is in a conductive state, when the voltage between the terminals indicates the terminal voltage of the corresponding battery cell, it is detected that the balancing switch is abnormal.
- the balancing switch is not in a conductive state based on the control signal. Further, even when a certain balancing switch is in an open state, when the voltage between the terminals is lower than the terminal voltage of the corresponding battery cell, it is detected that the balancing switch is abnormal. In this case, the balancing switch is conductive regardless of the control signal.
- a voltage detection circuit composed of, for example, a differential amplifier is used.
- Balancing switches 129A to 129D are made of, for example, MOS FETs, and act to discharge the electric power stored in the corresponding battery cells BC1 to BC4, respectively.
- an electric load such as an inverter is connected to the assembled battery 2 in which a large number of battery cells are connected in series
- the supply of current to the electric load is performed by the entire number of battery cells connected in series.
- SOC state of charge
- the current is limited by the state of the battery cell that is most discharged in the assembled battery 2.
- the supply of current to the assembled battery 2 is performed for the entire number of battery cells connected in series.
- SOC state of charge
- the following cell balancing is performed as necessary. Specifically, among a large number of battery cells connected in series in the assembled battery 2, for a battery cell in a predetermined charged state, for example, a charged state exceeding the average value of the charged state of each battery cell, The balancing switch connected to the battery cell is turned on. As a result, a discharge current is caused to flow from the battery cell via a resistor connected in series to the balancing switch in a conductive state. As a result, the state of charge of each battery cell is controlled to approach each other.
- the battery cell in the assembled battery 2 that is in the most discharged state is used as a reference cell, and the discharge time is determined based on the difference in charge state from the reference cell.
- various cell balancing methods can be used to adjust the charge state of each battery cell.
- the charge state of each battery cell can be calculated
- the voltage between the terminals of the balancing switches 129A to 129D that is, the voltage between the source and drain of each FET constituting the balancing switches 129A to 129D is detected by the operation state detection circuits 128A to 128D and output to the potential conversion circuit 130.
- the potential conversion circuit 130 matches these potentials, and then the abnormality determination circuit 131 determines abnormality.
- the potential conversion circuit 130 also has a function of selecting a balancing switch to be diagnosed among the balancing switches 129A to 129D based on a control signal from the IC control circuit 123.
- the abnormality determination circuit 131 compares the voltage between the terminals with a predetermined determination voltage based on the control signal from the IC control circuit 123. To do. Thereby, the abnormality determination circuit 131 can determine whether or not the balancing switches 129A to 129D are abnormal.
- the discharge control circuit 132 is supplied with a command signal for making the balancing switch corresponding to the battery cell to be discharged from the IC control circuit 123 conductive. Based on this command signal, the discharge control circuit 132 outputs a signal corresponding to the gate voltage for conducting the balancing switches 129A to 129D composed of MOS type FETs as described above.
- the IC control circuit 123 When the IC control circuit 123 receives a communication signal from the control unit 6 in FIG. 1 via the communication circuit 127 and receives a discharge time command corresponding to each battery cell from the control unit 6, the IC control circuit 123 responds to the command. The cell balancing operation as described above is executed. Further, when detecting an abnormality in the balancing switches 129A to 129D, the IC control circuit 123 transmits the detection result to the control unit 6 via the communication circuit 127.
- the assembled battery monitoring device 3 performs an operation in either the normal mode or the low power consumption mode according to the state of the power supply unit 7. That is, if the power supply unit 7 is in the activated state, the assembled battery monitoring device 3 operates in the normal mode, while if the power supply unit 7 is in the activated stop state, the assembled battery monitoring device 3 is in the low power consumption mode. Perform the operation.
- the control unit 6 communicates with the host system 12 and the integrated circuit units 41 to 43 to measure the voltage of each battery cell 1 and the cell. Balancing as necessary.
- the power supply unit 7 is activated in response to the upper activation signal from the upper system 12 (hereinafter referred to as normal activation)
- the power supply unit 7 is activated in response to the timer activation signal from the timer activation circuit 8.
- timer activation the timing at which the control unit 6 and the integrated circuit units 41 to 43 are activated differs.
- FIG. 3 is a diagram showing an operation timing chart of each part of the assembled battery monitoring device 3.
- the operation timing of each part in the normal activation is shown in the period from time t0 to t1
- the operation timing of each part in the timer activation is shown in the period from time t2 to t5.
- a period between times t1 and t2 between these periods indicates a period of waiting for activation when the assembled battery monitoring device 3 is operating in the low power consumption mode.
- the controller 6 activated as described above outputs an activation maintenance signal to the OR logic input circuit 10 as shown in a diagram 34. Thereby, even if the output of the upper activation signal from the upper system 12 is stopped, the output of the activation signal from the OR logic input circuit 10 to the power supply unit 7 is continued by the control unit 6, and the control unit 6 performs its own operation. To be able to continue. Further, the control unit 6 transmits a predetermined communication signal to the integrated circuit units 41 to 43 via the communication interface 5 and the insulating element 91. When this communication signal is received, the integrated circuit portions 41 to 43 are activated as shown in the diagram 36, and communication signals are transmitted and received between the control portion 6 and the integrated circuit portions 41 to 43. Thereby, according to the instruction
- the control unit 6 starts processing for ending the activation.
- the control unit 6 outputs a timer setting signal to the timer starting circuit 8, thereby setting a timer time corresponding to the time until the next starting timing as shown in a diagram 37. That is, of the two types of timer times described above, the timer time T1 is set for the timer starting circuit 8.
- the control unit 6 transmits a communication signal for instructing the integrated circuit units 41 to 43 to stop the operation via the communication interface 5 and the insulating element 91. When this communication signal is received, the integrated circuit portions 41 to 43 are in a start / stop state as shown in a diagram 36.
- the control unit 6 stops the output of the activation maintaining signal as shown in the diagram 34. Thereby, the power supply from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 is stopped, and the operation of the control unit 6 is stopped as shown in a diagram 35. As a result, at time t1, the operation mode of the assembled battery monitoring device 3 shifts from the normal mode to the low power consumption mode. In this low power consumption mode, power supply from the main power supply circuit 71 is stopped in the power supply unit 7, but standby power supply from the standby power supply circuit 72 is not stopped. Therefore, it is possible to continue the operation of the timer starting circuit 8 and determine whether the set timer time has elapsed during the low power consumption mode.
- the timer starting circuit 8 After the operation in the low power consumption mode is started at time t1, when the set timer time T1 elapses and time t2 is reached, the timer starting circuit 8 outputs a timer starting signal.
- the power supply unit 7 is restarted in response to the output of the timer start signal, and the power supply from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 is resumed.
- the control unit 6 is activated again, and the assembled battery monitoring device 3 starts normal mode operation by timer activation.
- control unit 6 executes pre-processing for cell balancing.
- the control unit 6 first performs the same operation as that at the time of the normal activation described above. That is, as shown in the diagram 34, the activation maintaining signal is output to the OR logic input circuit 10 so that the operation of the control unit 6 can be continued. Further, the control unit 6 transmits a predetermined communication signal to the integrated circuit units 41 to 43 via the communication interface 5 and the insulating element 91. When this communication signal is received, the integrated circuit portions 41 to 43 are activated as shown in the diagram 36.
- the control unit 6 transmits a communication signal instructing voltage measurement of each battery cell 1 to the integrated circuit units 41 to 43, and the measurement results are integrated circuit units 41 to 43. Get from. Then, the necessity of cell balancing is determined based on the obtained voltage measurement result of each battery cell 1, and if necessary, a communication signal for instructing the battery cell 1 to execute cell balancing is transmitted to the integrated circuit unit 41. To 43.
- the control unit 6 starts processing for starting up.
- the control unit 6 outputs a timer setting signal to the timer starting circuit 8 to set a timer time corresponding to the time required for cell balancing as shown in a diagram 37. That is, of the two types of timer times described above, the timer time T2 is set for the timer starting circuit 8.
- the output of the activation maintaining signal is stopped.
- the power supply from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 is stopped, and the operation of the control unit 6 is stopped as shown in a diagram 35.
- the cell balancing operation by the integrated circuit units 41 to 43 is continued, and the operation mode of the assembled battery monitoring device 3 shifts from the normal mode to the low power consumption mode.
- the timer start circuit 8 After the operation in the low power consumption mode is started at time t3, when the timer time T2 set according to the time required for cell balancing elapses and time t4 comes, the timer start circuit 8 outputs a timer start signal. In response to the output of the timer activation signal, the power supply unit 7 is restarted as described above, and the power supply from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 is resumed. As a result, as shown in a diagram 35, the control unit 6 is activated again, and the assembled battery monitoring device 3 resumes normal mode operation by timer activation.
- the control unit 6 performs post-processing of cell balancing. At this time, the control unit 6 outputs the activation maintaining signal to the OR logic input circuit 10 so that the operation of the control unit 6 can be continued as shown in the diagram 34.
- a communication signal instructing voltage measurement of each battery cell 1 is transmitted to the integrated circuit units 41 to 43, and the measurement result is acquired from the integrated circuit units 41 to 43. Then, based on the obtained voltage measurement result of each battery cell 1, it is determined whether or not cell balancing is completed. As a result, if the cell balancing is completed, a communication signal for instructing the operation stop to the integrated circuit units 41 to 43 is transmitted via the communication interface 5 and the insulating element 91. When this communication signal is received, the integrated circuit portions 41 to 43 are in a start / stop state as shown in a diagram 36.
- the control unit 6 starts processing for ending the activation.
- the control unit 6 outputs a timer setting signal to the timer starting circuit 8, and sets a timer time T1 corresponding to the time until the next starting timing, as shown in a diagram 37.
- the output of the activation maintaining signal is stopped.
- the power supply from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 is stopped, and the operation of the control unit 6 is stopped as shown in a diagram 35.
- time t5 the operation mode of the assembled battery monitoring device 3 shifts from the normal mode to the low power consumption mode.
- the same operation as described above is repeated. That is, when an upper activation signal is output from the upper system 12 during standby in the activation waiting state, the assembled battery monitoring device 3 performs an operation based on normal activation, similarly to the period from time t0 to t1.
- the assembled battery monitoring device 3 is the same as the period from time t2 to t5.
- the timer is activated. Specifically, pre-processing is performed to start cell balancing, and the integrated circuit units 41 to 43 are operated in the low power consumption mode to execute cell balancing. Then, post-processing is performed to perform integration of the integrated circuit units 41 to 43. Stop operation. Then, by operating in the low power consumption mode until the next activation timing, it waits in the activation waiting state.
- the upper start signal from the upper system 12 and the timer start signal from the timer start circuit 8 are respectively output as signals having different voltage levels.
- the control unit 6 when the control unit 6 is activated by supplying power from the main power supply circuit 71 of the power supply unit 7, it measures the voltage level of the input signal to the power supply unit 7, that is, the activation signal from the OR logic input circuit 10. Then, based on the voltage level, it can be determined whether the input signal is a higher order start signal or a timer start signal. Based on the determination result, either normal activation or timer activation can be selected, and an operation corresponding to the selection result can be performed. Alternatively, the power supply unit 7 may measure the voltage level of the input signal and output the measurement result to the control unit 6.
- FIG. 4 is a flowchart showing a process flow when the timer of the assembled battery monitoring device 3 according to the first embodiment of the present invention is started.
- the details of the processing when the timer of the present embodiment is started will be described.
- step S10 the timer starting circuit 8 determines whether or not a preset timer time T1 has elapsed since the last power supply from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 was stopped. .
- This timer time T1 is for performing cell balancing periodically as described above, and the processing of step S270 described later is controlled by the control of the host system 12 at normal startup or at the previous cell balancing. 6 is set in the timer starting circuit 8. The process stays at step S10 until the timer time T1 elapses, and proceeds to step S20 when elapses.
- step S20 the timer activation circuit 8 outputs a timer activation signal to the OR logic input circuit 10.
- This timer activation signal is input to the power supply unit 7 as an activation signal via the OR logic input circuit 10.
- the timer starting circuit 8 starts the power supply unit 7 and starts supplying power from the main power supply circuit 71 to the control unit 6.
- step S30 the power supply unit 7 is activated in response to the timer activation signal input as the activation signal in step S20, and starts supplying power to the control unit 6. That is, power supply from the main power supply circuit 71 to the control unit 6 is performed while continuing supply of standby power from the standby power supply circuit 72 to the timer starting circuit 8. Thereby, operation
- step S40 the control unit 6 outputs an activation maintaining signal to the power supply unit 7.
- This activation maintaining signal is input to the power supply unit 7 as an activation signal via the OR logic input circuit 10 in the same manner as the timer activation signal output from the timer activation circuit 8 in step S20.
- step S50 the control unit 6 transmits a voltage measurement command for each battery cell 1 of the assembled battery 2 to the integrated circuit units 41 to 43. That is, with each battery cell 1 of the cell groups GB1 to GB3 as a measurement target, a communication signal including these voltage measurement command information is transmitted from the control unit 6. This communication signal is transmitted to the integrated circuit unit 41 via the communication interface 5 and the insulating element 91. As a result, the integrated circuit units 41 to 43 connected in a daisy chain are sequentially activated, and a communication signal from the control unit 6 is received.
- step S60 the integrated circuit units 41 to 43 measure the voltage of each battery cell 1 of the corresponding cell group according to the voltage measurement command transmitted from the control unit 6 in step S50.
- step S70 the integrated circuit units 41 to 43 transmit the result of the voltage measurement of each battery cell 1 performed in step S60 to the control unit 6, respectively. That is, the communication signal including the voltage measurement result of each battery cell 1 is transmitted in the order of the integrated circuit units 41 to 43 connected in a daisy chain. This communication signal is transmitted from the integrated circuit unit 43 to the control unit 6 via the communication interface 5 and the insulating element 92 and is received by the control unit 6.
- step S80 the control unit 6 calculates the remaining charge capacity of each battery cell 1 based on the voltage measurement result of each battery cell 1 received from the integrated circuit units 41 to 43 in step S70.
- the table information indicating the relationship between the voltage value of each battery cell 1 and the remaining charge capacity is stored in the control unit 6 in advance, and this table information is used to correspond to the voltage measurement result of each battery cell 1. The remaining charge capacity to be obtained can be obtained.
- step S90 the control unit 6 determines whether cell balancing is necessary based on the remaining charge capacity of each battery cell 1 calculated in step S80. For example, when there is a battery cell 1 having a minimum remaining charge capacity among the remaining charge capacities of each battery cell 1 as a reference value and a difference in remaining charge capacity with respect to the reference value exceeds a predetermined control range, the battery It is determined that cell balancing is necessary for the cell 1. Or it is good also considering the average value of the remaining charge capacity of each battery cell 1 as a reference value. As a result, when it is determined that cell balancing is necessary for at least one battery cell 1, the process proceeds to step S100.
- step S90 the control unit 6 can determine whether or not cell balancing is necessary based on the voltage measurement result of each battery cell 1 received from the integrated circuit units 41 to 43 in step S70.
- step S100 the control unit 6 calculates the time required for cell balancing based on the remaining charge capacity of each battery cell 1 calculated in step S80. For example, among the remaining charge capacities of the battery cells 1 whose difference from the reference value exceeds a predetermined control range, the remaining charge capacity of the battery cell 1 having the smallest difference from the reference value is used, and this is cell balancing. To calculate the time required for discharging to the reference value.
- the control unit 6 can calculate the time required for cell balancing based on the voltage measurement result of each battery cell 1 received from the integrated circuit units 41 to 43 in step S70.
- step S110 the control unit 6 transmits a cell balancing start command to the integrated circuit units 41 to 43 for each battery cell 1 determined in step S90 that cell balancing is necessary. That is, a communication signal including cell balancing start command information of the battery cell 1 is transmitted from the control unit 6 to the integrated circuit unit corresponding to the cell group to which the battery cell 1 belongs. This communication signal is transmitted to the integrated circuit unit 41 via the communication interface 5 and the insulating element 91, and is received in the order of the integrated circuit units 41 to 43 connected in a daisy chain.
- step S120 the integrated circuit units 41 to 43 start cell balancing of each battery cell 1 specified in the corresponding cell group in response to the cell balancing start command transmitted from the control unit 6 in step S110. To do.
- step S130 the control unit 6 outputs a timer setting signal to the timer starting circuit 8, and sets the timer time T2.
- the value of the timer time T2 to be set is determined based on the calculation result of the time required for cell balancing in step S100. Thereby, the timer time T2 can be set in the timer starting circuit 8 in accordance with the timing at which the cell balancing should be stopped.
- step S140 the control unit 6 stops the output of the activation maintaining signal started in step S40, thereby stopping the activation signal from the OR logic input circuit 10 to the power supply unit 7, and putting the power supply unit 7 in the activation stopped state. Transition. This stops the supply of power from the main power supply circuit 71 to the power supply unit 7.
- step S150 the power supply unit 7 shifts to a start stop state in response to the stop of the start signal in step S140, and stops the power supply to the control unit 6. That is, the supply of power from the main power supply circuit 71 to the control unit 6 is stopped while continuing the supply of standby power from the standby power supply circuit 72 to the timer starting circuit 8. Thereby, the operation of the control unit 6 is stopped in a state where the cell balancing is being performed in the integrated circuit units 41 to 43, and the operation in the low power consumption mode is started in the assembled battery monitoring device 3.
- step S160 the timer activation circuit 8 determines whether or not the timer time T2 set in step S130 has elapsed since the supply of power from the main power supply circuit 71 of the power supply unit 7 to the control unit 6 was stopped in step S150. Determine. The process stays at step S160 until the timer time T2 elapses, and proceeds to step S170 after elapse.
- step S170 the timer starting circuit 8, the power supply unit 7, and the control unit 6 perform the same processes as those in steps S20 to S40 described above. That is, in step S170, the timer activation circuit 8 outputs a timer activation signal, activates the power supply unit 7, and starts supplying power. In response to the timer activation signal, the power supply unit 7 is activated in step S180, whereby the control unit 6 outputs an activation maintenance signal to the power supply unit 7 in step S190.
- step S200 the control unit 6 transmits a cell balancing stop command to the integrated circuit units 41 to 43 for each battery cell 1 that has transmitted the cell balancing start command in step S110. That is, a communication signal including cell balancing stop command information of the battery cell 1 is transmitted from the control unit 6 to the integrated circuit unit corresponding to the cell group to which the battery cell 1 belongs. This communication signal is transmitted to the integrated circuit unit 41 via the communication interface 5 and the insulating element 91, and is received in the order of the integrated circuit units 41 to 43 connected in a daisy chain.
- step S210 the integrated circuit units 41 to 43 stop cell balancing of each battery cell 1 specified in the corresponding cell group in response to the cell balancing stop command transmitted from the control unit 6 in step S200. To do.
- step S220 the integrated circuit units 41 to 43 measure the voltages of the respective battery cells 1 of the corresponding cell group.
- step S230 the integrated circuit units 41 to 43 transmit the result of the voltage measurement of each battery cell 1 performed in step S220 to the control unit 6 as in step S70.
- step S240 the control unit 6 uses the same method as in step S80 based on the voltage measurement result of each battery cell 1 received from the integrated circuit units 41 to 43 in step S230, to determine the battery cell 1 after cell balancing. Calculate the remaining charge capacity.
- step S250 the control unit 6 determines whether or not cell balancing is completed based on the remaining charge capacity of each battery cell 1 after cell balancing calculated in step S240. This determination can be made by a method similar to the determination in step S90 described above. That is, the minimum remaining charge capacity of the remaining charge capacities of each battery cell 1 or the average value of the remaining charge capacities of each battery cell 1 is set as a reference value, and the difference of the remaining charge capacity with respect to the reference value is within a predetermined control range. It is determined whether or not there are battery cells 1 that exceed.
- step S260 if there is at least one battery cell 1 that satisfies these conditions, it is determined that cell balancing has not been completed, the process returns to step S100, and cell balancing is performed again as described above. On the other hand, if no battery cell 1 that satisfies the condition exists, it is determined that cell balancing is completed, and the process proceeds to step S260.
- step S260 the control unit 6 transmits an operation stop command to the integrated circuit units 41 to 43. That is, a communication signal including command information for stopping the operation of the integrated circuit units 41 to 43 is transmitted from the control unit 6. This communication signal is transmitted to the integrated circuit units 41 to 43 via the communication interface 5 and the insulating element 91. In response to this operation stop command, the operations of the integrated circuit units 41 to 43 connected in a daisy chain are stopped.
- step S270 the control unit 6 outputs a timer setting signal to the timer starting circuit 8, and sets the timer time T1.
- the set value of the timer time T1 is preferably set in advance according to the execution interval of cell balancing performed in the low power consumption mode in the control unit 6 or the timer starting circuit 8.
- step S280 similarly to step S140, the control unit 6 stops the activation signal from the OR logic input circuit 10 to the power supply unit 7 by stopping the output of the activation maintenance signal started in step S190, and the power supply unit 7 is shifted to the start / stop state. This stops the supply of power from the main power supply circuit 71 to the power supply unit 7.
- step S290 similarly to step S150, the power supply unit 7 shifts to the start stop state in response to the stop of the start signal in step S280, and stops the power supply to the control unit 6. Thereby, after the cell balancing is completed, the operation of the control unit 6 is stopped, and the assembled battery monitoring device 3 starts the operation in the low power consumption mode. If step S290 is performed, it will return to step S10 and will wait until timer time 1 passes next.
- the assembled battery monitoring device 3 monitors the assembled battery 2 having cell groups GB1 to GB3 in which a plurality of battery cells 1 are connected in series, and includes an integrated circuit unit 41 to 43 and an integrated circuit unit 41 to 43 includes a control unit 6 that communicates with the control unit 43 to control them, and a power supply unit 7 that supplies power to the control unit 6.
- the integrated circuit portions 41 to 43 are provided corresponding to the cell groups GB1 to GB3 of the assembled battery 2, respectively, and measure the voltage of each battery cell 1 of the cell group, and each battery cell 1 of the cell group. Cell balancing is performed to adjust the capacity.
- the control unit 6 causes the integrated circuit units 41 to 43 to start (step S120) or stop (step S210) cell balancing in accordance with the supply of power from the power supply unit 7, and to start a timer for starting the power supply unit 7.
- Time is set (steps S130 and S270), and the power supply unit 7 is stopped from supplying power (steps S140 and S280).
- the power supply unit 7 is activated according to the timer time set in step S130 or S270, and starts supplying power to the control unit 6 (steps S30 and S180).
- the control unit 6 transmits a command for measuring the voltage of each battery cell 1 of the corresponding cell group to the integrated circuit units 41 to 43 (step S50).
- the integrated circuit units 41 to 43 measure the voltage of each battery cell 1 in the corresponding cell group in response to the command from the control unit 6 (step S60), and transmit the measurement result to the control unit 6 (step S60).
- S70 The control unit 6 determines whether or not cell balancing is necessary based on the voltage measurement result of each battery cell 1 received from the integrated circuit units 41 to 43 (step S90). Then, the integrated circuit units 41 to 43 start cell balancing. Since it did in this way, it can be judged correctly whether cell balancing is required, and if necessary, cell balancing can be started reliably.
- the power supply unit 7 is connected to the timer starting circuit 8 capable of setting the timer time T1 and the timer time T2.
- the timer starting circuit 8 has stopped supplying power to the control unit 6 by the power supply unit 7.
- the power supply unit 7 is activated (steps S20 and S170), and the supply of power is started.
- the control unit 6 causes the integrated circuit units 41 to 43 to start cell balancing in step S120, and causes the timer activation circuit 8 to start the timer time T2. Is set (step S130).
- Step S270 Since it did in this way, while performing cell balancing regularly in the assembled battery monitoring apparatus 3, cell balancing can be stopped at a suitable timing.
- the control unit 6 calculates the required time for cell balancing based on the voltage measurement result of each battery cell 1 received from the integrated circuit units 41 to 43 (step S100). In S130, a timer time T2 is set. Since it did in this way, the timer time T2 can be set with an appropriate value according to the timing which should stop cell balancing.
- the assembled battery monitoring device 3 further includes a timer starting circuit 8.
- the power supply unit 7 includes a main power supply circuit 71 for supplying power to the control unit 6 and a standby power supply circuit 72 for constantly supplying standby power to the timer starting circuit 8.
- a standby power supply circuit 72 for constantly supplying standby power to the timer starting circuit 8.
- the power supply unit 7 is connected to the host system 12 that controls the assembled battery monitoring device 3, and is activated (normally activated) in accordance with a host activation signal output from the host system 12. Start supplying power.
- the control unit 6 performs a process for completing the activation when the output of the upper activation signal from the upper system 12 is stopped. After performing, the output of the activation maintaining signal is stopped, and the power supply unit 7 is stopped from supplying power. Since it did in this way, operation
- the timer activation circuit 8 may activate the power supply unit 7 by outputting a timer activation signal having a voltage level different from that of the upper activation signal from the upper system 12 to the power supply unit 7. In this case, based on the voltage level of the input signal to the power supply unit 7, the control unit 6 can determine whether the input signal is a higher order start signal or a timer start signal. In this way, the assembled battery monitoring device 3 can be appropriately operated for normal activation, that is, when activated by the host system 12, and when the timer is activated, that is, when activated by the timer activation circuit 8. .
- FIG. 5 is a flowchart showing a flow of processing when the timer of the assembled battery monitoring device 3 according to the second embodiment of the present invention is started.
- the same step numbers are assigned to the processing steps having the same contents as the processing according to the first embodiment shown in FIG. In the following description, the processing steps of the same step number will be omitted unless particularly required.
- step S111 the control unit 6 identifies the battery cell 1 having the longest time required for cell balancing calculated in step S100, from among the battery cells 1 determined to require cell balancing in step S90. . Then, it is determined whether the battery cell number assigned to the battery cell 1 is an odd number or an even number. If the battery cell number of the battery cell 1 is an odd number, that is, if the battery cell 1 is the battery cell BC1 or BC3 of FIG. 2, the process proceeds to step S112. On the other hand, if the battery cell number of the battery cell 1 is an even number, that is, if the battery cell 1 is the battery cell BC2 or BC4 of FIG. 2, the process proceeds to step S113.
- step S112 the control unit 6 sends a cell balancing start command to the integrated circuit unit 41 for each battery cell 1 that has been determined that cell balancing is necessary in step S90, for which the battery cell number is an odd number.
- a communication signal including cell balancing start command information of the battery cell 1 is transmitted from the control unit 6 to the integrated circuit unit corresponding to the cell group to which the odd-numbered battery cell 1 belongs. This communication signal is transmitted to the integrated circuit unit 41 via the communication interface 5 and the insulating element 91, and is received in the order of the integrated circuit units 41 to 43 connected in a daisy chain.
- step S113 the control unit 6 issues a cell balancing start command to the integrated circuit unit 41 for each battery cell 1 that has been determined to require cell balancing in step S90 and that has an even battery cell number.
- a communication signal including cell balancing start command information of the battery cell 1 is transmitted from the control unit 6 to the integrated circuit unit corresponding to the cell group to which the even-numbered battery cell 1 belongs. This communication signal is transmitted to the integrated circuit unit 41 via the communication interface 5 and the insulating element 91, and is received in the order of the integrated circuit units 41 to 43 connected in a daisy chain.
- step S112 or step S113 processing similar to the flowchart of FIG. 4 described in the first embodiment is executed after step S120.
- the same functions and effects as those described in the first embodiment can be achieved. Furthermore, cell balancing can be performed for battery cells 1 adjacent to each other at different timings. Therefore, a large number of battery cells 1 connected in series perform cell balancing at the same time, so that an excessive current can be prevented from flowing into the integrated circuit portions 41 to 43.
- FIG. 6 is a diagram showing the configuration of the assembled battery monitoring device according to the third embodiment of the present invention.
- the assembled battery monitoring device 3A shown in FIG. 6 differs from the assembled battery monitoring device 3 of FIG. 1 described in the first embodiment in that the timer starting circuit 8 is not provided inside.
- the assembled battery monitoring device 3A is connected to a host system 12A having a timer starting circuit 8.
- the host system 12A outputs a timer start signal from the internal timer start circuit 8 to the assembled battery monitoring device 3A in addition to the upper start signal described in the first embodiment. These signals are respectively input to the OR logic input circuit 10 and output to the power supply unit 7 as activation signals, as described in the first embodiment.
- the control unit 6 can set a timer time for the timer starting circuit 8 by transmitting and receiving an upper communication signal to and from the upper system 12A via the upper communication interface 11.
- the host communication signal including the timer time setting information is transmitted from the control unit 6, the host system 12A sets the timer time for the internal timer starting circuit 8.
- the timer start signal is output from the timer start circuit 8 and input to the power supply unit 7 via the OR logic input circuit 10 in the same manner as described in the first embodiment. .
- the power supply part 7 is started and the power supply to the control part 6 is started, and the operation mode of the assembled battery monitoring device 3A is shifted from the low power consumption mode to the normal mode.
- process at the time of timer transition in the assembled battery monitoring device 3A according to the present embodiment may be performed according to any of the flowcharts of FIGS. 4 and 5 described in the first and second embodiments.
- the same operational effects as those of the first and second embodiments can be achieved. Furthermore, since the timer starting circuit 8 is provided outside the assembled battery monitoring device 3A, the power consumption of the assembled battery monitoring device 3A can be further reduced, and the cost and space can be reduced.
- the timer starting circuit 8 is provided in the host system 12A.
- the timer starting circuit 8 may be provided in other locations.
- the feature of the present invention may be realized by using the timer starting circuit 8 as an external circuit for function expansion of the assembled battery monitoring device 3A and connecting it to the assembled battery monitoring device 3A. .
- the assembled battery monitoring device 3 or 3A monitors the assembled battery 2 constituted by the three cell groups GB1 to GB3 in which the four battery cells 1 are connected in series.
- the configuration of the assembled battery to be monitored by the assembled battery monitoring device of the present invention is not limited to this.
- the present invention is applicable to an assembled battery monitoring device that monitors an assembled battery of any configuration as long as it has one or more cell groups in which a plurality of battery cells are connected in series.
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Abstract
Description
図1は、本発明の第1の実施形態による組電池監視装置の構成を示す図である。図1に示す組電池監視装置3は、複数の電池セル1をそれぞれ直列に接続したセルグループGB1~GB3によって構成される組電池2を監視するものであり、組電池2、上位システム12および鉛蓄電池13に接続されている。この組電池監視装置3は、図1に示すように、集積回路部41~43、絶縁素子91および92、通信インターフェース5、制御部6、電源部7、タイマ起動回路8、OR論理入力回路10および上位通信インターフェース11を備えている。なお、組電池監視装置3は、組電池2の電力を用いてモータ駆動を行うシステム、たとえば電気自動車やハイブリッド電気自動車等の車両システムに搭載されて使用される。
次に、本発明の第2の実施形態について説明する。前述の第1の実施形態では、セルバランシングの必要がある全ての電池セル1について、同時にセルバランシングを行う例を説明した。これに対して、以下に説明する第2の実施形態では、互いに隣接する電池セル1同士については、別々のタイミングでセルバランシングを行う例を説明する。なお、本実施形態による組電池監視装置の構成は、図1に示したものと同一である。したがって、以下の説明では、図1に示した組電池監視装置3の構成を用いて、本実施形態による組電池監視装置の動作を説明する。
次に、本発明の第3の実施形態について説明する。前述の第1の実施形態では、内部にタイマ起動回路8が設けられている組電池監視装置3の例を説明した。これに対して、以下に説明する第3の実施形態では、タイマ起動回路8が外部に設けられている組電池監視装置の例を説明する。
Claims (9)
- 複数の電池セルを直列接続したセルグループを単数または複数有する組電池を監視する組電池監視装置であって、
前記組電池の各セルグループに対応して設けられており、当該セルグループの各電池セルの電圧を測定すると共に、当該セルグループの各電池セルの容量を調整するためのセルバランシングを行う集積回路部と、
前記集積回路部と通信を行って前記集積回路部を制御する制御部と、
前記制御部へ電源を供給する電源部と、を備え、
前記制御部は、前記電源部からの前記電源の供給に応じて、前記集積回路部に前記セルバランシングを開始または停止させると共に、前記電源部を起動するためのタイマ時間を設定して前記電源部に前記電源の供給を停止させ、
前記電源部は、前記タイマ時間に応じて起動して前記電源の供給を開始する組電池監視装置。 - 請求項1に記載の組電池監視装置において、
前記制御部は、対応するセルグループの各電池セルの電圧を測定するための指令を前記集積回路部へ送信し、
前記集積回路部は、前記制御部からの指令に応じて、対応するセルグループの各電池セルの電圧を測定してその測定結果を前記制御部へ送信し、
前記制御部は、前記集積回路部から受信した各電池セルの電圧測定結果に基づいて前記セルバランシングが必要か否かを判断し、必要と判断した場合には、前記集積回路部に前記セルバランシングを開始させる組電池監視装置。 - 請求項2に記載の組電池監視装置において、
前記電源部は、第1のタイマ時間と、第2のタイマ時間とを設定可能なタイマ起動回路に接続されており、
前記タイマ起動回路は、前記電源部による前記電源の供給が停止されてから前記第1のタイマ時間または前記第2のタイマ時間が経過したときに、前記電源部を起動させて前記電源の供給を開始させ、
前記制御部は、
前記第1のタイマ時間が経過して前記電源部が起動された場合には、前記集積回路部に前記セルバランシングを開始させると共に、前記タイマ起動回路に対して前記第2のタイマ時間を設定し、
前記第2のタイマ時間が経過して前記電源部が起動された場合には、前記集積回路部に前記セルバランシングを停止させると共に、前記タイマ起動回路に対して前記第1のタイマ時間を設定する組電池監視装置。 - 請求項3に記載の組電池監視装置において、
前記制御部は、前記集積回路部から受信した各電池セルの電圧測定結果に基づいて前記セルバランシングの所要時間を算出し、その算出結果に基づいて前記第2のタイマ時間を設定する組電池監視装置。 - 請求項3または4に記載の組電池監視装置において、
前記タイマ起動回路をさらに備える組電池監視装置。 - 請求項5に記載の組電池監視装置において、
前記電源部は、前記制御部へ前記電源を供給するための主電源回路と、前記タイマ起動回路へ待機電源を常時供給するための待機電源回路とを有する組電池監視装置。 - 請求項3または4に記載の組電池監視装置において、
前記電源部は、前記組電池監視装置を制御する上位システムに接続されており、
前記電源部は、前記上位システムから出力される上位起動信号に応じて起動して前記電源の供給を開始し、
前記制御部は、前記上位起動信号に応じて前記電源部が起動された場合には、前記上位システムからの前記上位起動信号の出力が停止されると、前記電源部に前記電源の供給を停止させる組電池監視装置。 - 請求項7に記載の組電池監視装置において、
前記タイマ起動回路は、前記上位起動信号とは異なる電圧レベルのタイマ起動信号を前記電源部へ出力することにより、前記電源部を起動させ、
前記制御部は、前記電源部への入力信号の電圧レベルに基づいて、前記入力信号が前記上位起動信号と前記タイマ起動信号のいずれであるかを判別する組電池監視装置。 - 請求項7に記載の組電池監視装置において、
前記タイマ起動回路は、前記上位システム内に設けられている組電池監視装置。
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