WO2022162755A1 - 蓄電池管理装置および電池装置の管理方法 - Google Patents
蓄電池管理装置および電池装置の管理方法 Download PDFInfo
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- WO2022162755A1 WO2022162755A1 PCT/JP2021/002717 JP2021002717W WO2022162755A1 WO 2022162755 A1 WO2022162755 A1 WO 2022162755A1 JP 2021002717 W JP2021002717 W JP 2021002717W WO 2022162755 A1 WO2022162755 A1 WO 2022162755A1
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- activation
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- ocv
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- 238000000034 method Methods 0.000 title claims description 85
- 230000004913 activation Effects 0.000 claims abstract description 221
- 230000008859 change Effects 0.000 claims abstract description 82
- 238000012423 maintenance Methods 0.000 claims abstract description 77
- 238000012544 monitoring process Methods 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 238000005259 measurement Methods 0.000 claims description 25
- 238000007726 management method Methods 0.000 description 78
- 230000008569 process Effects 0.000 description 64
- 238000012545 processing Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 16
- 238000004590 computer program Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the technology disclosed in this specification relates to a storage battery management device and a method of managing a battery device.
- the OCV Open Circuit Voltage
- SOC State of Charge
- the battery voltage fluctuates depending on the operating state of the target device that operates on batteries. Therefore, there is known a technique of obtaining an accurate battery voltage measurement value by measuring the battery voltage when the target device is in a specific operation mode (see, for example, Patent Document 1). Also, since the battery voltage may fluctuate even when the target device is in a specific operation mode, the battery voltage is repeatedly measured at a predetermined cycle, and the average value of the measured values is calculated as the battery voltage. A technique is known (see, for example, Patent Document 2).
- the control unit that performs OCV measurement is in the OCV measurement state (or measurement standby state) for a long time. There is a problem that the required power consumption is large.
- This specification discloses a technology capable of solving the above-described problems.
- a first storage battery management device disclosed in the present specification is a device for managing an assembled battery in which a plurality of storage batteries are connected in series, and includes a voltage measurement unit, a control unit, a voltage conversion A circuit, an activation switch, and a power activation circuit.
- a voltage measurement unit measures a voltage of each of the plurality of storage batteries.
- a voltage conversion circuit is provided on a path for supplying power from the assembled battery to the control unit.
- a start switch is connected between the voltage conversion circuit and the assembled battery.
- the power activation circuit has an input terminal to which an external activation signal is input, and when the external activation signal becomes the activation logic, the activation switch is turned on, and a monitoring signal indicating the logic state of the external activation signal is provided.
- control section has a line switch control section, an activation maintenance control section, and an OCV identification section.
- the line switch control unit turns on the line switch connected in series with the assembled battery when the logic state of the external activation signal becomes logic of activation, and when the logic state of the external activation signal becomes logic of stop, The line switch is turned off.
- the activation maintenance control section starts outputting the activation maintenance signal to the power supply activation circuit when the logic state of the external activation signal becomes the activation logic.
- the OCV identification unit obtains, at predetermined time intervals, the amount of change in the voltage of each of the plurality of storage batteries measured by the voltage measurement unit, When the amount of change in each of the voltages is less than a predetermined amount of change, the voltage of each of the plurality of storage batteries at that time is recorded as OCV, and the start-maintenance control unit stops outputting the start-maintenance signal.
- this storage battery management device After the logic state of the external start signal becomes the logic of stop and the line switch is turned off, when all the amount of change in the voltage of each storage battery becomes equal to or less than the predetermined amount of change, each When the voltage of the storage battery sufficiently converges, the voltage at that time is recorded as the OCV, so the OCV of each storage battery can be specified with high accuracy. As a result, predetermined processing using OCV (for example, estimation of SOC) can be executed with high accuracy.
- predetermined processing using OCV for example, estimation of SOC
- the start switch is turned off, and the power supply from the assembled battery to the control unit is stopped. Power consumption required for identifying OCV can be reduced.
- the OCV identification unit determines the amount of change in the voltage of each of the plurality of storage batteries measured by the voltage measurement unit when the logic state of the external activation signal becomes logic of stop. obtained at time intervals, and every time the amount of change is obtained a predetermined number of times before all the amounts of change in voltage of each of the plurality of storage batteries become equal to or less than a predetermined amount of change, from the amount of change obtained so far
- the OCV of each of the plurality of storage batteries may be estimated and recorded. According to this storage battery management device, the OCV of each storage battery can be identified at a relatively early timing. As a result, predetermined processing using OCV (for example, estimation of SOC) can be executed at relatively early timing.
- the logic state of the external start signal becomes the start logic, the line switch is turned on, and each line switch is turned on. Even if the OCV of the storage battery cannot be measured, it is possible to identify the OCV of each storage battery using the previously performed OCV estimation result. As a result, it is possible to avoid a situation where predetermined processing using OCV (for example, estimation of SOC) cannot be performed.
- a second storage battery management device disclosed in the present specification is a device for managing an assembled battery in which a plurality of storage batteries are connected in series, and includes a voltage measurement unit, a control unit, a voltage conversion A circuit, an activation switch, and a power activation circuit.
- a voltage measurement unit measures a voltage of each of the plurality of storage batteries.
- a voltage conversion circuit is provided on a path for supplying power from the assembled battery to the control unit.
- a start switch is connected between the voltage conversion circuit and the assembled battery.
- the power activation circuit has an input terminal to which an external activation signal is input, and when the external activation signal becomes the activation logic, the activation switch is turned on, and a monitoring signal indicating the logic state of the external activation signal is provided.
- control section has a line switch control section, an activation maintenance control section, and an OCV identification section.
- the line switch control unit turns on the line switch connected in series with the assembled battery when the logic state of the external activation signal becomes logic of activation, and when the logic state of the external activation signal becomes logic of stop, The line switch is turned off.
- the activation maintenance control section starts outputting the activation maintenance signal to the power supply activation circuit when the logic state of the external activation signal becomes the activation logic.
- the OCV specifying unit acquires the amount of change in the voltage of each of the plurality of storage batteries measured by the voltage measuring unit at predetermined time intervals, and determines the amount of change.
- the OCV of each of the plurality of storage batteries is estimated from the amount of change acquired up to that time and recorded, and the start-up maintenance control unit stops outputting the start-up maintenance signal.
- this storage battery management device As soon as the OCV of each storage battery is recorded, the output of the start maintenance signal is stopped, the start switch is turned off, and the power supply from the assembled battery to the control unit is stopped. Power consumption required for identifying the OCV of the storage battery can be reduced.
- the specification of the OCV of each storage battery is completed at a preset timing, and the power supply from the assembled battery to the control unit is stopped. can do. That is, for example, even if it takes time for the voltage of each storage battery to converge, such as when the current flowing through the assembled battery immediately before is large, the OCV of each storage battery is specified before the convergence and assembled. Power supply from the battery to the controller can be stopped. Therefore, according to this storage battery management device, it is possible to effectively reduce the power consumption required for specifying the OCV of each storage battery.
- a third storage battery management device disclosed in the present specification is a device for managing an assembled battery in which a plurality of storage batteries are connected in series, and includes a voltage measurement unit, a control unit, a voltage conversion A circuit, an activation switch, and a power activation circuit.
- a voltage measurement unit measures a voltage of each of the plurality of storage batteries.
- a voltage conversion circuit is provided on a path for supplying power from the assembled battery to the control unit.
- a start switch is connected between the voltage conversion circuit and the assembled battery.
- the power activation circuit has an input terminal to which an external activation signal is input, and when the external activation signal becomes the activation logic, the activation switch is turned on, and a monitoring signal indicating the logic state of the external activation signal is provided.
- control section has a line switch control section, an activation maintenance control section, and an OCV identification section.
- the line switch control unit turns on the line switch connected in series with the assembled battery when the logic state of the external activation signal becomes logic of activation, and when the logic state of the external activation signal becomes logic of stop, The line switch is turned off.
- the activation maintenance control section starts outputting the activation maintenance signal to the power supply activation circuit when the logic state of the external activation signal becomes the activation logic.
- the OCV specifying unit acquires the amount of change in the voltage of each of the plurality of storage batteries measured by the voltage measuring unit at predetermined time intervals, and determines the amount of change.
- the OCV of each of the plurality of storage batteries is estimated from the amount of change acquired up to that time and recorded, and when a predetermined time elapses after the line switch is turned off, the OCV is recorded.
- the activation maintenance control unit is caused to stop outputting the activation maintenance signal.
- this storage battery management device As soon as the OCV of each storage battery is recorded, the output of the start maintenance signal is stopped, the start switch is turned off, and the power supply from the assembled battery to the control unit is stopped. Power consumption required for identifying the OCV of the storage battery can be reduced.
- the specification of the OCV of each storage battery is completed at a preset timing, and the power supply from the assembled battery to the control unit is stopped. can do. That is, for example, even if it takes time for the voltage of each storage battery to converge, such as when the current flowing through the assembled battery immediately before is large, the OCV of each storage battery is specified before the convergence and assembled. Power supply from the battery to the controller can be stopped. Therefore, according to this storage battery management device, it is possible to effectively reduce the power consumption required for specifying the OCV of each storage battery.
- the OCV identification unit determines the amount of change in the voltage of each of the plurality of storage batteries measured by the voltage measurement unit when the logic state of the external activation signal becomes logic of stop.
- the activation maintenance control unit stops outputting the activation maintenance signal, and then the logic of the external activation signal.
- the state becomes the start logic, the voltage of each of the plurality of storage batteries at that time is recorded as an OCV, and the line switch control section may turn on the line switch.
- this storage battery management device since the voltage of each storage battery that has further sufficiently converged is recorded as the OCV, it is possible to specify the OCV of each storage battery with higher accuracy. As a result, predetermined processing using OCV (for example, estimation of SOC) can be executed with higher accuracy.
- Explanatory diagram schematically showing the configuration of the battery device 100 in the first embodiment. 4 is a sequence diagram showing storage battery management processing according to the first embodiment; FIG. Explanatory diagram showing an example of the state of each signal and the state of each switch during the storage battery management process of the first embodiment. Explanatory drawing showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 in a specific period during the storage battery management process of the first embodiment. An explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the storage battery management process of the second embodiment.
- FIG. 1 is an explanatory diagram schematically showing the configuration of a battery device 100 according to the first embodiment.
- the battery device 100 includes an assembled battery 10 and a storage battery management device 20 .
- the assembled battery 10 has a configuration in which a plurality of storage batteries 12 are connected in series.
- the assembled battery 10 is composed of four storage batteries 12 .
- Each storage battery 12 is, for example, a lithium ion battery.
- the assembled battery 10 is connected to a load (not shown) and an external power supply via a positive terminal 42 and a negative terminal 44 .
- the storage battery management device 20 is a device for managing the battery device 100 including the assembled battery 10 .
- the storage battery management device 20 includes a voltmeter 22, an ammeter 24, a monitoring unit 28, a voltage conversion circuit 32, a start switch 34, a power supply start circuit 36, a line switch 40, a control unit 60, and a recording unit. 70.
- One voltmeter 22 is provided for each storage battery 12 .
- Each voltmeter 22 is connected in parallel to each storage battery 12 , measures the voltage of each storage battery 12 , and outputs a signal indicating the voltage measurement value to the monitoring unit 28 .
- Ammeter 24 is connected in series with assembled battery 10 . The ammeter 24 measures the current flowing through the assembled battery 10 and outputs a signal indicating the current measurement value to the monitoring unit 28 . Based on the signals received from the voltmeter 22 and the ammeter 24 , the monitoring unit 28 outputs a signal indicating the voltage of each storage battery 12 and the current flowing through the assembled battery 10 to the control unit 60 .
- the voltmeter 22 and the monitoring section 28 are examples of a voltage measuring section.
- the line switch 40 is installed between the assembled battery 10 and the negative terminal 44 .
- the line switch 40 opens and closes the connection between the assembled battery 10 and the load and the external power supply by being controlled on/off by the control unit 60 .
- a MOSFET or a relay is used as the line switch 40 .
- the control unit 60 is configured using, for example, a CPU, a multi-core CPU, and programmable devices (Field Programmable Gate Array (FPGA), Programmable Logic Device (PLD), etc.), and controls the operation of the storage battery management device 20.
- the control unit 60 has functions as a line switch control unit 61 , an activation maintenance control unit 62 , an OCV identification unit 63 and a timer unit 64 . The functions of these units will be described together with the description of the storage battery management process described later.
- the recording unit 70 is composed of, for example, a ROM, a RAM, a hard disk drive (HDD), etc., and stores various programs and data, and is used as a work area and a data storage area when executing various processes. .
- the recording unit 70 stores a computer program for executing storage battery management processing, which will be described later.
- the computer program is provided in a state stored in a computer-readable recording medium (not shown) such as a CD-ROM, DVD-ROM, USB memory, etc., and installed in the battery device 100 to the recording unit 70. Stored.
- the voltage conversion circuit 32 is provided on the path 35 that supplies power from the assembled battery 10 to the control unit 60 .
- the voltage conversion circuit 32 is a circuit that converts the voltage of the electric power from the assembled battery 10 and supplies it to the control section 60 .
- the activation switch 34 is arranged between the assembled battery 10 and the voltage conversion circuit 32 on the path 35 and opens and closes the connection between the assembled battery 10 and the voltage conversion circuit 32 .
- As the starting switch 34 for example, a MOSFET or a relay is used.
- the power activation circuit 36 is a circuit that controls the on/off of the activation switch 34 .
- the power activation circuit 36 has an input terminal 37 to which an external activation signal So is input via a signal receiving terminal 38 (enable, EN).
- FIG. 2 is a sequence diagram showing storage battery management processing according to the first embodiment.
- FIG. 3 is an explanatory diagram showing an example of the state of each signal and the state of each switch during the storage battery management process of the first embodiment.
- FIG. 4 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period (period T1 in FIG. 3) during the storage battery management process of the first embodiment. be.
- the power activation circuit 36 (FIG. 1) monitors whether or not the external activation signal So input from the input terminal 37 of the power activation circuit 36 is logic for activation (S110). .
- the external activation signal So is a signal input via the signal receiving terminal 38 for switching the battery device 100 between the activated state and the stopped state.
- the power activation circuit 36 turns on the activation switch 34 (S120) (time t1 in FIG. 3). As a result, power supply from the assembled battery 10 to the control unit 60 via the voltage conversion circuit 32 is started.
- the power activation circuit 36 starts outputting the monitoring signal Sm indicating the logic state of the external activation signal So to the control unit 60 (S120). After that, the power activation circuit 36 monitors whether or not the external activation signal So has become the logic of stop (S122), and if the logic of the external activation signal So becomes the logic of stop (S122: YES), the logic state of the monitoring signal Sm is changed. is switched to stop logic (S124).
- the control unit 60 monitors whether or not the logic state of the external activation signal So indicated by the monitoring signal Sm input from the power source activation circuit 36 is activation logic. (S210).
- the line switch control unit 61 of the control unit 60 turns on the line switch 40 (S220) (FIG. 3). time t1). This connects the assembled battery 10 to the load and the external power supply.
- the activation maintenance control section 62 of the control section 60 starts outputting the activation maintenance signal Sh to the power activation circuit 36 (S220).
- the power activation circuit 36 monitors whether the activation maintenance signal Sh is input from the control unit 60 (S130), and as long as the activation maintenance signal Sh is input (S130: YES), the activation switch 34 is maintained in the ON state. do. As long as the activation maintenance signal Sh is input (S130: YES), the power activation circuit 36 continues to monitor whether or not the external activation signal So has the logic of stop (S122).
- the control unit 60 monitors whether or not the logic state of the external activation signal So indicated by the monitoring signal Sm input from the power source activation circuit 36 is the logic of stop (S230).
- the line switch control unit 61 of the control unit 60 turns off the line switch 40 (S240) (FIGS. 3 and 4). time t2 in FIG. 4). This disconnects the assembled battery 10 from the load and the external power supply, and the voltage Vcell of each storage battery 12 fluctuates so as to converge toward OCV.
- the OCV identification unit 63 of the control unit 60 starts OCV identification processing for each storage battery 12, which will be described below (S250). That is, as shown in FIG. 4 , the OCV identification unit 63 of the control unit 60 changes the voltage Vcell of each storage battery 12 measured by the voltmeter 22 and the monitoring unit 28 at predetermined time intervals measured by the timer unit 64. A quantity (amount of voltage change per predetermined time) ⁇ Vcell is acquired. When all the amounts of change ⁇ Vcell in the voltage Vcell of each storage battery 12 become equal to or less than a predetermined amount of change ⁇ Vth, the OCV identification unit 63 records the voltage Vcell of each storage battery 12 at that point in the recording unit 70 as OCV.
- the voltage Vcell of each storage battery 12 is considered to be sufficiently converged and can be regarded as OCV. It is assumed that Vcell is recorded as OCV.
- the control unit 60 monitors whether or not the logic state of the external activation signal So indicated by the monitor signal Sm is the stop logic (S260), and the OCV identification process is completed. (S270).
- the OCV identification unit 63 of the control unit 60 maintains the activation.
- the controller 62 is caused to stop outputting the activation maintenance signal Sh (S280) (time t3 in FIGS. 3 and 4).
- the power activation circuit 36 determines that the activation maintenance signal Sh is not input from the control unit 60 (S130: NO), and turns off the activation switch 34 (S140). ). As a result, the power supply from the assembled battery 10 to the control unit 60 via the voltage conversion circuit 32 is stopped, and the power consumption by the control unit 60 becomes zero. Note that if the logic state of the external activation signal So indicated by the monitoring signal Sm becomes the activation logic (S260: NO) before the OCV identification process is completed (S270: NO), the control unit 60 performs the above-described S220 and subsequent steps. Execute the same process. After that, the processing described above is repeatedly executed.
- the storage battery management device 20 of this embodiment is a device for managing the assembled battery 10 in which the plurality of storage batteries 12 are connected in series.
- the storage battery management device 20 includes a voltmeter 22 and a monitor section 28 , a control section 60 , a voltage conversion circuit 32 , a start switch 34 and a power supply start circuit 36 .
- the voltmeter 22 and the monitoring unit 28 measure the voltage Vcell of each of the multiple storage batteries 12 .
- the voltage conversion circuit 32 is provided on a path 35 that supplies electric power from the assembled battery 10 to the controller 60 .
- Start switch 34 is connected between voltage conversion circuit 32 and assembled battery 10 .
- the power activation circuit 36 has an input terminal 37 to which the external activation signal So is input. is output to the control unit 60, and the ON state of the start switch 34 is maintained as long as the start maintaining signal Sh is input from the control unit 60.
- the control unit 60 also has a line switch control unit 61 , an activation maintenance control unit 62 and an OCV identification unit 63 .
- the line switch control unit 61 turns on the line switch 40 connected in series with the battery pack 10 to turn on the external activation signal indicated by the monitoring signal Sm.
- the line switch 40 is turned off.
- the activation maintenance control unit 62 starts outputting the activation maintenance signal Sh to the power activation circuit 36 when the logic state of the external activation signal So indicated by the monitoring signal Sm becomes the activation logic.
- the OCV identification unit 63 acquires the amount of change ⁇ Vcell in the voltage Vcell of each of the plurality of storage batteries 12 at predetermined time intervals, When the amount of change ⁇ Vcell of each of the voltages Vcell of all becomes equal to or less than the predetermined amount of change ⁇ Vth, the voltage Vcell of each of the plurality of storage batteries 12 at that time is recorded as OCV, and the start-maintenance control unit 62 outputs the start-maintenance signal Sh. stop.
- each storage battery 12 is turned off.
- the amount of change ⁇ Vcell of the voltage Vcell becomes equal to or less than the predetermined amount of change ⁇ Vth, that is, when the voltage Vcell of each storage battery 12 sufficiently converges, the voltage Vcell at that time is recorded as the OCV, so the OCV of each storage battery 12 is increased.
- predetermined processing using OCV for example, estimation of SOC
- the storage battery management device 20 of the present embodiment as soon as the OCV is recorded, the output of the activation maintenance signal Sh is stopped, the activation switch 34 is turned off, and the power supply from the assembled battery 10 to the control unit 60 is stopped. Since it is stopped, power consumption required for specifying the OCV of each storage battery 12 can be reduced.
- FIG. 5 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the storage battery management process of the second embodiment.
- FIG. 5 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the storage battery management process of the second embodiment.
- the OCV identification process for each storage battery 12 is completed (S270 in FIG. 2: YES), the output of the activation maintenance signal Sh is stopped (S280), and the activation switch 34 is turned off.
- the OCV specifying unit 63 of the control unit 60 determines that when the logic state of the external activation signal So becomes the activation logic next time (time t4 in FIG. 5), each The voltage Vcell of the storage battery 12 is recorded as the OCV (that is, the OCV of each storage battery 12 recorded in the recording unit 70 is updated), and then the line switch control unit 61 is caused to turn on the line switch 40 .
- the OCV identification unit 63 of the control unit 60 detects the voltmeter 22 and the monitoring unit 28 when the logic state of the external activation signal So indicated by the monitoring signal Sm becomes the stop logic.
- the change amount ⁇ Vcell of the voltage Vcell of each storage battery 12 measured by is acquired at predetermined time intervals, and when all the change amounts ⁇ Vcell of the voltage Vcell of each storage battery 12 become equal to or less than the predetermined change amount ⁇ Vth
- the output of the signal Sh is stopped and the logic state of the external activation signal So becomes the activation logic
- the voltage Vcell of each storage battery 12 at that time is recorded as OCV, and the line switch control unit 61 turns on the line switch 40.
- the sufficiently converged voltage Vcell of each storage battery 12 is recorded as the OCV, so the OCV of each storage battery 12 can be specified with higher accuracy.
- predetermined processing using OCV for example, estimation of SOC
- FIG. 6 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the storage battery management process of the third embodiment.
- FIG. 6 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the storage battery management process of the third embodiment.
- the method of the OCV identification process (S250 in FIG. 2) is different from the above-described storage battery management process of the first embodiment. Specifically, when starting the OCV identification process, the OCV identification unit 63 of the control unit 60, as shown in FIG. ⁇ Vcell is obtained, and it is monitored whether or not the amount of change ⁇ Vcell of the voltage Vcell of each storage battery 12 has become equal to or less than a predetermined amount of change ⁇ Vth.
- the OCV specifying unit 63 determines whether the change amount ⁇ Vcell of the voltage Vcell of each storage battery 12 has reached a predetermined number of acquisition times before all the change amounts ⁇ Vcell of the voltage Vcell of the storage batteries 12 become equal to or less than the predetermined change amount ⁇ Vth.
- the OCV of each storage battery 12 is estimated from the obtained change amount ⁇ Vcell of the voltage Vcell, and the estimated OCV is recorded in the recording unit 70 . For example, in the example shown in FIG. 6, the OCV of each storage battery 12 is estimated and recorded each time the change amount ⁇ Vcell of the voltage Vcell is acquired three times or more (times ta, tb, and tc in FIG. 6). is executed.
- the OCV specifying unit 63 sets the voltage Vcell of each storage battery 12 at that time as the OCV to the recording unit 70. (that is, update the OCV of each storage battery 12 recorded in the recording unit 70).
- the method of estimating the OCV of each storage battery 12 by the OCV specifying unit 63 can be performed by any method. It is possible to adopt a method of calculating an approximated curve representing the temporal transition of the voltage Vcell, determining the convergence value of the voltage Vcell of each storage battery 12 on the approximated curve, and estimating the convergence value as the OCV.
- the OCV identifying unit 63 detects the The amount of change ⁇ Vcell in the voltage Vcell of each storage battery 12 is obtained at predetermined time intervals, and the number of times of obtaining the amount of change ⁇ Vcell in the voltage Vcell before all the amounts of change ⁇ Vcell in the voltage Vcell of each storage battery 12 become equal to or less than the predetermined amount of change ⁇ Vth. Every time the predetermined number of times is reached, the OCV of each storage battery 12 is estimated from the change amount ⁇ Vcell of the voltage Vcell acquired so far and recorded. Therefore, according to the third embodiment, the OCV of each storage battery 12 can be identified at relatively early timing. As a result, predetermined processing using OCV (for example, estimation of SOC) can be executed at relatively early timing.
- each storage battery 12 is stored using the previously executed OCV estimation result (for example, the estimation result at time ta in FIG. 7). OCV identification can be accomplished. As a result, it is possible to avoid a situation where predetermined processing using OCV (for example, estimation of SOC) cannot be performed.
- FIG. 8 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the battery management process of the fourth embodiment.
- FIG. 8 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the battery management process of the fourth embodiment.
- the method of the OCV identification process (S250 in FIG. 2) is different from the above-described storage battery management process of the first embodiment. Specifically, when the OCV identification unit 63 of the control unit 60 starts the OCV identification process, as shown in FIG. ⁇ Vcell is acquired, and when the number of acquisitions of the amount of change ⁇ Vcell in the voltage Vcell reaches a predetermined number of times, the OCV of each storage battery 12 is estimated from the amount of change ⁇ Vcell in the voltage Vcell acquired so far, and the estimated OCV is stored in the recording unit 70. Record. For example, in the example shown in FIG.
- the OCV identification unit 63 immediately causes the activation maintenance control unit 62 to stop outputting the activation maintenance signal Sh.
- the OCV identifying unit 63 detects the The amount of change ⁇ Vcell in the voltage Vcell of each storage battery 12 is obtained at predetermined time intervals, and when the number of times of obtaining the amount of change ⁇ Vcell in the voltage Vcell reaches a predetermined number of times, the OCV of each storage battery 12 is calculated from the amount of change ⁇ Vcell in the voltage Vcell obtained up to that point. is estimated and recorded, and the activation maintenance control section 62 is caused to stop outputting the activation maintenance signal Sh.
- the storage battery management process of the fourth embodiment immediately after the OCV of each storage battery 12 is recorded, the output of the activation maintenance signal Sh is stopped, the activation switch 34 is turned off, and the battery pack 10 to the control unit 60 is turned off. Since the power supply to the storage battery 12 is stopped, the power consumption required for specifying the OCV of each storage battery 12 can be reduced.
- the specification of the OCV of each storage battery 12 is completed at a preset timing, and control is performed from the assembled battery 10. Power supply to unit 60 can be stopped.
- the OCV of each storage battery 12 can be specified before the convergence. Since the power supply from the assembled battery 10 to the control unit 60 can be stopped upon completion, the power consumption required for specifying the OCV of each storage battery 12 can be effectively reduced.
- FIG. 9 is an explanatory diagram showing an example of the state of each signal, the state of each switch, and the state of the voltage Vcell of each storage battery 12 during a specific period during the battery management process of the fifth embodiment.
- the points of the battery management process of the fifth embodiment that differ from the battery management process of the first embodiment described above will be described, and the points that are the same as the battery management process of the first embodiment will not be described. Omit as appropriate.
- the method of the OCV identification process (S250 in FIG. 2) is different from the above-described storage battery management process of the first embodiment. Specifically, when starting the OCV identification process, the OCV identification unit 63 of the control unit 60, as shown in FIG. ⁇ Vcell is acquired, and every time the number of acquisitions of the amount of change ⁇ Vcell in the voltage Vcell reaches a predetermined number of times, the OCV of each storage battery 12 is estimated from the amount of change ⁇ Vcell in the voltage Vcell acquired so far and recorded in the recording unit 70 .
- the same method as the estimation method in the above-described third embodiment can be adopted. Further, when a predetermined time elapses after the line switch 40 is turned off (that is, after the OCV identification process is started), the OCV identification unit 63 stops outputting the activation maintenance signal Sh to the activation maintenance control unit 62.
- the OCV of each storage battery 12 is estimated and recorded every time the change amount ⁇ Vcell of the voltage Vcell is acquired three times or more, and the line switch 40 is turned off. At time t6 after a predetermined period of time has elapsed, the output of the activation maintenance signal Sh is stopped.
- the OCV specifying unit 63 When the logic state of the external activation signal So indicated by the monitoring signal Sm becomes the stop logic, the OCV specifying unit 63 The amount of change ⁇ Vcell in the voltage Vcell of each storage battery 12 is obtained at predetermined time intervals, and each time the number of times of obtaining the amount of change ⁇ Vcell in the voltage Vcell reaches a predetermined number of times, the amount of change ⁇ Vcell in the voltage Vcell obtained so far is used to The OCV is estimated and recorded, and when a predetermined time has elapsed since the line switch 40 was turned off, the activation maintenance control section 62 is caused to stop outputting the activation maintenance signal Sh.
- the storage battery management process of the fifth embodiment as soon as the OCV is recorded, the output of the activation maintenance signal Sh is stopped, the activation switch 34 is turned off, and the power supply from the assembled battery 10 to the control unit 60 is stopped. Since it is stopped, power consumption required for specifying the OCV of each storage battery 12 can be reduced.
- the specification of the OCV of each storage battery 12 is completed at a preset timing, and the transmission from the assembled battery 10 to the control unit 60 is completed. Power supply can be stopped.
- the OCV of each storage battery 12 is specified before the convergence. Since the power supply from the assembled battery 10 to the control unit 60 can be stopped at the same time, the power consumption required for specifying the OCV of each storage battery 12 can be effectively reduced.
- the configuration of the battery device 100 in each of the above embodiments is merely an example, and various modifications are possible.
- the number of storage batteries 12 forming the assembled battery 10 can be arbitrarily changed.
- the power activation circuit 36 and the control section 60 may be integrated.
- the content of the storage battery management process in each of the above embodiments is merely an example, and various modifications are possible.
- the OCV identification processing of each storage battery 12 in the storage battery management processing the OCV identification is performed according to the current value flowing through the assembled battery 10 immediately before the processing (immediately before the line switch 40 is turned off). You may change the method of processing. Specifically, when the current value flowing through the assembled battery 10 immediately before is relatively small, it is considered that the time required for the voltage Vcell of each storage battery 12 to converge is relatively short.
- the activation switch 34 is maintained in the ON state until all the variation ⁇ Vcell of the voltage Vcell of each storage battery 12 becomes equal to or less than the predetermined variation ⁇ Vth, and a method of giving priority to improving the accuracy of specifying the OCV is adopted.
- a method may be adopted in which the activation switch 34 is turned off before all the variation ⁇ Vcell of the voltage Vcell of each storage battery 12 becomes equal to or less than the predetermined variation ⁇ Vth, thereby giving priority to reduction of power consumption.
- the OCV identification processing of each storage battery 12 is completed, the output of the activation maintenance signal Sh is stopped, and the activation switch 34 is turned off. After that, when the logic state of the external activation signal So becomes the activation logic, the line switch 40 may be turned on after the voltage Vcell of each storage battery 12 at that time is recorded as OCV.
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Abstract
Description
A-1.電池装置100の構成:
図1は、第1実施形態における電池装置100の構成を概略的に示す説明図である。電池装置100は、組電池10と、蓄電池管理装置20とを備える。
次に、第1実施形態の電池装置100において蓄電池管理装置20により実行される蓄電池管理処理について説明する。第1実施形態の蓄電池管理処理は、ラインスイッチ40を開閉することによって組電池10と負荷および外部電源との間の接続状態を切り替えたり、組電池10を構成する各蓄電池12のOCVを特定したりする処理である。蓄電池管理処理は、電池装置100の稼働中、繰り返し実行される。図2は、第1実施形態の蓄電池管理処理を示すシーケンス図である。図3は、第1実施形態の蓄電池管理処理中の各信号の状態や各スイッチの状態の一例を示す説明図である。図4は、第1実施形態の蓄電池管理処理中の特定の期間(図3の期間T1)における各信号の状態や各スイッチの状態、各蓄電池12の電圧Vcellの状態の一例を示す説明図である。
以上説明したように、本実施形態の蓄電池管理装置20は、複数の蓄電池12が直列に接続された組電池10を管理するための装置である。蓄電池管理装置20は、電圧計22および監視部28と、制御部60と、電圧変換回路32と、起動スイッチ34と、電源起動回路36とを備える。電圧計22および監視部28は、複数の蓄電池12のそれぞれの電圧Vcellを計測する。電圧変換回路32は、組電池10から制御部60に電力を供給する経路35上に設けられる。起動スイッチ34は、電圧変換回路32と組電池10との間に接続される。電源起動回路36は、外部起動信号Soが入力される入力端子37を有し、外部起動信号Soが起動の論理になると、起動スイッチ34をオン状態にすると共に、外部起動信号Soの論理状態を示す監視信号Smを制御部60に向けて出力し、制御部60から起動維持信号Shが入力されている限り起動スイッチ34のオン状態を維持する。
図5は、第2実施形態の蓄電池管理処理中の特定の期間における各信号の状態や各スイッチの状態、各蓄電池12の電圧Vcellの状態の一例を示す説明図である。以下では、第2実施形態の電池管理処理のうち、上述した第1実施形態の電池管理処理と異なる点についてのみ説明し、第1実施形態の電池管理処理と同一の点については、その説明を適宜省略する。
図6は、第3実施形態の蓄電池管理処理中の特定の期間における各信号の状態や各スイッチの状態、各蓄電池12の電圧Vcellの状態の一例を示す説明図である。以下では、第3実施形態の電池管理処理のうち、上述した第1実施形態の電池管理処理と異なる点についてのみ説明し、第1実施形態の電池管理処理と同一の点については、その説明を適宜省略する。
図8は、第4実施形態の電池管理処理中の特定の期間における各信号の状態や各スイッチの状態、各蓄電池12の電圧Vcellの状態の一例を示す説明図である。以下では、第4実施形態の電池管理処理のうち、上述した第1実施形態の電池管理処理と異なる点についてのみ説明し、第1実施形態の電池管理処理と同一の点については、その説明を適宜省略する。
図9は、第5実施形態の電池管理処理中の特定の期間における各信号の状態や各スイッチの状態、各蓄電池12の電圧Vcellの状態の一例を示す説明図である。以下では、第5実施形態の電池管理処理のうち、上述した第1実施形態の電池管理処理と異なる点についてのみ説明し、第1実施形態の電池管理処理と同一の点については、その説明を適宜省略する。
本明細書で開示される技術は、上述の実施形態に限られるものではなく、その要旨を逸脱しない範囲において種々の形態に変形することができ、例えば次のような変形も可能である。
Claims (6)
- 複数の蓄電池が直列に接続された組電池を管理するための蓄電池管理装置であって、
前記複数の蓄電池のそれぞれの電圧を計測する電圧計測部と、
制御部と、
前記組電池から前記制御部に電力を供給する経路上に設けられる電圧変換回路と、
前記電圧変換回路と前記組電池との間に接続される起動スイッチと、
外部起動信号が入力される入力端子を有し、前記外部起動信号が起動の論理になると、前記起動スイッチをオン状態にすると共に、前記外部起動信号の論理状態を示す監視信号を前記制御部に向けて出力し、前記制御部から起動維持信号が入力されている限り前記起動スイッチのオン状態を維持する電源起動回路と、
を備え、
前記制御部は、
前記外部起動信号の論理状態が起動の論理になると、前記組電池に直列に接続されたラインスイッチをオン状態にし、前記外部起動信号の論理状態が停止の論理になると、前記ラインスイッチをオフ状態にするラインスイッチ制御部と、
前記外部起動信号の論理状態が起動の論理になると、前記電源起動回路への前記起動維持信号の出力を開始する起動維持制御部と、
前記外部起動信号の論理状態が停止の論理になると、前記電圧計測部により計測された前記複数の蓄電池のそれぞれの電圧の変化量を所定時間間隔で取得し、前記複数の蓄電池のそれぞれの電圧の変化量がすべて所定変化量以下になると、その時点の前記複数の蓄電池のそれぞれの電圧をOCVとして記録し、前記起動維持制御部に前記起動維持信号の出力を停止させるOCV特定部と、
を有する、蓄電池管理装置。 - 請求項1に記載の蓄電池管理装置であって、
前記OCV特定部は、前記外部起動信号の論理状態が停止の論理になると、前記電圧計測部により計測された前記複数の蓄電池のそれぞれの電圧の変化量を所定時間間隔で取得し、前記複数の蓄電池のそれぞれの電圧の変化量がすべて所定変化量以下になる前に、前記変化量の取得回数が所定回数に達する度に、それまで取得した前記変化量から前記複数の蓄電池のそれぞれのOCVを推定して記録する、蓄電池管理装置。 - 複数の蓄電池が直列に接続された組電池を管理するための蓄電池管理装置であって、
前記複数の蓄電池のそれぞれの電圧を計測する電圧計測部と、
制御部と、
前記組電池から前記制御部に電力を供給する経路上に設けられる電圧変換回路と、
前記電圧変換回路と前記組電池との間に接続される起動スイッチと、
外部起動信号が入力される入力端子を有し、前記外部起動信号が起動の論理になると、前記起動スイッチをオン状態にすると共に、前記外部起動信号の論理状態を示す監視信号を前記制御部に向けて出力し、前記制御部から起動維持信号が入力されている限り前記起動スイッチのオン状態を維持する電源起動回路と、
を備え、
前記制御部は、
前記外部起動信号の論理状態が起動の論理になると、前記組電池に直列に接続されたラインスイッチをオン状態にし、前記外部起動信号の論理状態が停止の論理になると、前記ラインスイッチをオフ状態にするラインスイッチ制御部と、
前記外部起動信号の論理状態が起動の論理になると、前記電源起動回路への前記起動維持信号の出力を開始する起動維持制御部と、
前記外部起動信号の論理状態が停止の論理になると、前記電圧計測部により計測された前記複数の蓄電池のそれぞれの電圧の変化量を所定時間間隔で取得し、前記変化量の取得回数が所定回数に達すると、それまで取得した前記変化量から前記複数の蓄電池のそれぞれのOCVを推定して記録し、前記起動維持制御部に前記起動維持信号の出力を停止させるOCV特定部と、
を有する、蓄電池管理装置。 - 複数の蓄電池が直列に接続された組電池を管理するための蓄電池管理装置であって、
前記複数の蓄電池のそれぞれの電圧を計測する電圧計測部と、
制御部と、
前記組電池から前記制御部に電力を供給する経路上に設けられる電圧変換回路と、
前記電圧変換回路と前記組電池との間に接続される起動スイッチと、
外部起動信号が入力される入力端子を有し、前記外部起動信号が起動の論理になると、前記起動スイッチをオン状態にすると共に、前記外部起動信号の論理状態を示す監視信号を前記制御部に向けて出力し、前記制御部から起動維持信号が入力されている限り前記起動スイッチのオン状態を維持する電源起動回路と、
を備え、
前記制御部は、
前記外部起動信号の論理状態が起動の論理になると、前記組電池に直列に接続されたラインスイッチをオン状態にし、前記外部起動信号の論理状態が停止の論理になると、前記ラインスイッチをオフ状態にするラインスイッチ制御部と、
前記外部起動信号の論理状態が起動の論理になると、前記電源起動回路への前記起動維持信号の出力を開始する起動維持制御部と、
前記外部起動信号の論理状態が停止の論理になると、前記電圧計測部により計測された前記複数の蓄電池のそれぞれの電圧の変化量を所定時間間隔で取得し、前記変化量の取得回数が所定回数に達する度に、それまで取得した前記変化量から前記複数の蓄電池のそれぞれのOCVを推定して記録し、前記ラインスイッチがオフ状態とされてから所定時間が経過すると、前記起動維持制御部に前記起動維持信号の出力を停止させるOCV特定部と、
を有する、蓄電池管理装置。 - 請求項1から請求項4までのいずれか一項に記載の蓄電池管理装置であって、
前記OCV特定部は、前記外部起動信号の論理状態が停止の論理になると、前記電圧計測部により計測された前記複数の蓄電池のそれぞれの電圧の変化量を所定時間間隔で取得し、前記複数の蓄電池のそれぞれの電圧の変化量がすべて所定変化量以下になると、前記起動維持制御部に前記起動維持信号の出力を停止させ、次に前記外部起動信号の論理状態が起動の論理になると、その時点の前記複数の蓄電池のそれぞれの電圧をOCVとして記録して、前記ラインスイッチ制御部に前記ラインスイッチをオン状態にさせる、蓄電池管理装置。 - 複数の蓄電池が直列に接続された組電池と、
前記複数の蓄電池のそれぞれの電圧を計測する電圧計測部と、
制御部と、
前記組電池から前記制御部に電力を供給する経路上に設けられる電圧変換回路と、
前記電圧変換回路と前記組電池との間に接続される起動スイッチと、
外部起動信号が入力される入力端子を有し、前記外部起動信号が起動の論理になると、前記起動スイッチをオン状態にすると共に、前記外部起動信号の論理状態を示す監視信号を前記制御部に向けて出力し、前記制御部から起動維持信号が入力されている限り前記起動スイッチのオン状態を維持する電源起動回路と、
を備える電池装置の管理方法であって、
前記外部起動信号の論理状態が起動の論理になると、前記組電池に直列に接続されたラインスイッチをオン状態にし、前記外部起動信号の論理状態が停止の論理になると、前記ラインスイッチをオフ状態にする工程と、
前記外部起動信号の論理状態が起動の論理になると、前記電源起動回路への前記起動維持信号の出力を開始する工程と、
前記外部起動信号の論理状態が停止の論理になると、前記電圧計測部により計測された前記複数の蓄電池のそれぞれの電圧の変化量を所定時間間隔で取得し、前記複数の蓄電池のそれぞれの電圧の変化量がすべて所定変化量以下になると、その時点の前記複数の蓄電池のそれぞれの電圧をOCVとして記録し、前記起動維持信号の出力を停止する工程と、
を備える、電池装置の管理方法。
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JP2015146707A (ja) * | 2014-02-04 | 2015-08-13 | Jmエナジー株式会社 | 蓄電モジュール制御装置及び蓄電モジュール制御方法 |
JP2016091830A (ja) * | 2014-11-05 | 2016-05-23 | トヨタ自動車株式会社 | 電池システム |
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CN116746022A (zh) | 2023-09-12 |
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