WO2013114697A1 - 蓄電システム、二次電池パックの制御方法及び二次電池パック - Google Patents
蓄電システム、二次電池パックの制御方法及び二次電池パック Download PDFInfo
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- WO2013114697A1 WO2013114697A1 PCT/JP2012/078926 JP2012078926W WO2013114697A1 WO 2013114697 A1 WO2013114697 A1 WO 2013114697A1 JP 2012078926 W JP2012078926 W JP 2012078926W WO 2013114697 A1 WO2013114697 A1 WO 2013114697A1
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- secondary battery
- battery pack
- charging
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- switch
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a power storage system having a plurality of secondary battery packs, a control method for the secondary battery pack, and a secondary battery pack.
- secondary battery When creating an electricity storage system using a lithium ion secondary battery or the like (hereinafter simply referred to as “secondary battery”), a plurality of secondary batteries are connected in series to obtain a required output voltage.
- a battery pack is formed, and a plurality of secondary battery packs are connected in parallel to form a power storage system in order to obtain a required power storage capacity.
- Patent Document 1 includes a plurality of secondary battery packs that can be connected in parallel via a switch, and controls a switch provided for each secondary battery pack so that charging and discharging are performed. Describes a technique for eliminating the imbalance in voltage between terminals of each secondary battery pack.
- the voltage between terminals of each secondary battery pack is measured to start discharge from the secondary battery pack having the highest voltage between terminals, When the voltage between the terminals decreases due to the discharge and becomes substantially equal to the voltage between the terminals of the other secondary battery pack that has not been discharged, the discharge of the other secondary battery pack is started.
- each secondary battery pack included in the power storage system includes a discharge switch (hereinafter referred to as a discharge switch) and a charge switch (hereinafter referred to as a charge switch), and each secondary battery pack is individually provided. It can be discharged or charged.
- a discharge switch hereinafter referred to as a discharge switch
- a charge switch hereinafter referred to as a charge switch
- the secondary battery pack to be charged is switched from one secondary battery pack having a high inter-terminal voltage to the other secondary battery pack having a low inter-terminal voltage,
- the discharge switch and the charge switch of one of the secondary battery packs are turned off to temporarily stop the charging operation of the power storage system, and then the other secondary battery pack It is necessary to start charging the pack.
- An object of the present invention is to provide a power storage system, a secondary battery pack control method, and a secondary battery pack that can safely switch a secondary battery pack to be charged without stopping a charging operation.
- a power storage system of the present invention includes a secondary battery, a charge switch that turns on and off a charging current flowing through a charging path of the secondary battery, and a discharge switch that turns on and off a discharging current flowing through the discharge path of the secondary battery.
- a plurality of secondary battery packs each including a current limiting circuit connected in parallel with the charging switch for limiting the charging current to a certain value or less,
- the second secondary battery pack By operating the current limiting circuit of the battery pack, a path through which a charging current for charging the secondary battery included in the second secondary battery pack flows is formed, and the charging current is generated by the current limiting circuit.
- a host device that starts charging the second secondary battery pack while limiting it to a certain value or less and turns off a discharge switch of the first secondary battery pack; Have
- the secondary battery pack control method of the present invention includes a secondary battery, a charge switch for turning on and off a charging current flowing in the charging path of the secondary battery, and a discharging for turning on and off a discharging current flowing in the discharging path of the secondary battery.
- Control of a secondary battery pack for controlling a charging operation for a plurality of secondary battery packs each provided with a switch and a current limiting circuit connected in parallel with the charging switch for limiting the charging current to a certain value or less A method, Information processing device When the secondary battery pack to be charged is switched from the first secondary battery pack to the second secondary battery pack having a terminal voltage lower than that of the first secondary battery pack, the second secondary battery pack By operating the current limiting circuit of the battery pack, a path through which a charging current for charging the secondary battery included in the second secondary battery pack flows is formed, and the charging current is generated by the current limiting circuit. In this method, charging of the second secondary battery pack is started while being limited to a predetermined value or less, and the discharge switch of the first secondary battery pack is turned off.
- the secondary battery pack of the present invention includes a secondary battery, A charging switch for turning on and off a charging current flowing in the charging path of the secondary battery; A discharge switch for turning on and off a discharge current flowing in the discharge path of the secondary battery; A current limiting circuit connected in parallel with the charge switch for limiting the charging current to a certain value or less; A control unit for controlling the charge switch, the discharge switch and the current limiting circuit according to an instruction from the outside; Have
- FIG. 1 is a block diagram illustrating a configuration example of a power storage system according to the present invention.
- FIG. 2 is a circuit diagram showing an example of the operation of the power storage system shown in FIG.
- FIG. 3 is a flowchart illustrating an example of a processing procedure of the upper apparatus illustrated in FIG.
- FIG. 4 is a circuit diagram illustrating a configuration example of the discharge switch, the charge switch, and the current limiting circuit illustrated in FIG.
- FIG. 5 is a circuit diagram showing another configuration example of the discharge switch, the charge switch, and the current limiting circuit shown in FIG.
- FIG. 6 is a circuit diagram illustrating another configuration example of the discharge switch, the charge switch, and the current limiting circuit illustrated in FIG. 1.
- FIG. 7 is a circuit diagram illustrating another configuration example of the discharge switch, the charge switch, and the current limiting circuit illustrated in FIG. 1.
- FIG. 1 is a block diagram showing a configuration example of a power storage system of the present invention.
- the power storage system of the present invention has two secondary battery packs 15 connected in parallel and a host device 14 for controlling them.
- the positive terminal (OUT (+)) and the negative terminal (OUT ( ⁇ )) of each secondary battery pack 15 is a load such as an electric device that consumes power discharged from the secondary battery pack 15. (Not shown) is connected.
- a power supply that supplies power necessary for charging the secondary battery pack 15 to the positive terminal (OUT (+)) and the negative terminal (OUT ( ⁇ )) of each secondary battery pack 15.
- a source not shown. Examples of the power supply source include a PV, a wind power generator, and a commercial power source.
- the secondary battery pack 15 may be provided with a well-known PCS (Power Conditioning System) including an AC / DC converter that converts it into DC power that can be stored.
- PCS Power Conditioning System
- the switching of the connection of the load or power supply source to the power storage system is controlled by, for example, the host device 14.
- the secondary battery pack 15 includes two secondary battery blocks 11 and a control block 12.
- the secondary battery block 11 has a configuration including a plurality of secondary batteries 10 connected in series, for example.
- the control block 12 includes a control unit 19, a battery detection unit 16, a current detection unit 20, a discharge switch 17, a charge switch 18, an insulation communication unit 13, and a current limiting circuit 21.
- the discharge switch 17 is a switch for turning on and off the current (discharge current) flowing in the discharge path of the secondary battery block 11, and the charge switch 18 is the switch for turning on and off the current (charge current) flowing in the charge path of the secondary battery block 11. It is.
- a MOSFET Metal-Oxide-Semiconductor-Field-Effect-Transistor
- On / off of the discharge switch 17 and the charge switch 18 is controlled by the control unit 19 in accordance with an instruction from the host device 14.
- the insulated communication unit 13 is an interface circuit that connects the control unit 19 and the host device 14 so that information can be transmitted and received.
- the insulation communication unit 13 only needs to be able to transmit and receive information while electrically insulating the control unit 19 and the host device 14, and any known insulation such as an optical coupling method, a magnetic coupling method, a capacitive coupling method, or the like. You may comprise using an element.
- the battery detection unit 16 measures the inter-terminal voltage of each secondary battery 10 included in the secondary battery block 11.
- the current detection unit 20 measures the discharge current and the charge current of the secondary battery pack 15 and notifies the control unit 19 of the measurement results.
- the current limiting circuit 21 is a circuit or element that limits the charging current flowing through the secondary battery block 11 to a certain value or less.
- the current limiting circuit 21 includes a switch (not shown), and is configured to be able to control on / off of the current limiting operation during charging by being turned on / off by the control unit 19 in accordance with an instruction from the device 14.
- the current limiting circuit 21 is connected in parallel with at least the charging switch 18.
- FIG. 1 shows a configuration example in which the current limiting circuit 21 is connected in parallel with the discharge switch 17 and the charge switch 18 connected in series.
- the control unit 19 controls the operation of the battery detection unit 16, the current detection unit 20, the discharge switch 17, the charge switch 18, and the current limiting circuit 21 in accordance with instructions from the host device 14. For example, the controller 19 turns on the discharge switch 17 when discharging the secondary battery block 11 and turns on the charge switch 18 when charging the secondary battery block 11. Further, the control unit 19 notifies the host device 14 of the inter-terminal voltage of each secondary battery 10 and the inter-terminal voltage of the secondary battery pack 15 measured by the battery detection unit 16 according to the instruction of the host device 14. What is necessary is just to obtain
- control unit 19 notifies the host device 14 of the discharge current or the charging current measured by the current detection unit 20 in accordance with an instruction from the host device 14.
- the battery detection unit 16, the current detection unit 20, and the control unit 19 can be realized by, for example, a well-known secondary battery monitoring (protection) IC (Integrated Circuit) having the above functions.
- the host device 14 controls the operation of the entire power storage system by communicating with the control unit 19 provided in the secondary battery pack 15.
- the host device 14 can be realized by, for example, a well-known information processing device (computer or information processing IC) including a CPU, a memory, various logic circuits, and the like. In that case, the host device 14 executes processing according to a program recorded in a recording medium (not shown), thereby realizing an operation as a power storage system of the present invention described later.
- the recording medium may be any known medium such as a magnetic disk, an optical disk, or a semiconductor memory.
- the power storage system includes two secondary battery packs 15 and each secondary battery pack 15 includes two secondary battery blocks 11.
- the power storage system includes three or more power storage systems.
- the secondary battery pack 15 may be provided, and the secondary battery pack 15 may be provided with one or three or more secondary battery blocks 11.
- Each secondary battery pack 15 and secondary battery block 11 may have the same configuration or different configurations.
- FIG. 2 is a circuit diagram showing an example of the operation of the power storage system shown in FIG.
- FIG. 2 shows that the secondary battery pack 15 to be charged is changed from one secondary battery pack 15 having a high terminal voltage (high voltage pack 15b) to the other secondary battery pack 15 having a low terminal voltage (low voltage pack 15a). ), The state of the charging current flowing in the low voltage pack 15a and the high voltage pack 15b is shown.
- FIG. 2 only the discharge switch 17, the charge switch 18, and the current limiting circuit 21 of the two secondary battery packs 15 (low voltage pack 15a and high voltage pack 15b) are shown. Further, it is assumed that both the discharge switch 17 and the charge switch 18 of the low voltage pack 15a are turned off before switching the secondary battery pack 15 to be charged.
- the host device 14 first switches the low voltage pack 15a to the low voltage pack 15a.
- the current limiting circuit 21 of the pack 15a is turned on.
- a path (charging current (I 1 ) in FIG. 2) for charging the secondary battery block 11 by the current limiting circuit 21 connected in parallel with the discharging switch 17 and the charging switch 18 is provided.
- Flow path is formed.
- the high voltage pack 15b has a higher inter-terminal voltage than the low voltage pack 15a.
- the low voltage pack 15a is not only supplied from the current supply source but also high. Charging current is also supplied from the voltage pack 15b. However, the charging current flowing through the low voltage pack 15 a is limited to a certain value or less by the current limiting circuit 21.
- the host device 14 turns off the discharge switch 17 of the high voltage pack 15b.
- a charging current I 2 in FIG. 2
- the charging current I 1 in FIG. 2
- the charging current supplied from the power supply source is distributed to the low voltage pack 15a and the high voltage pack 15. Therefore, a large charging current does not flow through the parasitic diode provided in the discharge switch (MOSFET) 17 of the high voltage pack 15. Therefore, the discharge switch (MOSFET) 17 of the high voltage pack 15b does not cause abnormal heat generation.
- the host device 14 turns on the charging switch 18 of the low voltage pack 15a and turns off the charging switch 18 of the high voltage pack 15b.
- the discharge switch 17 may also be turned on in the low voltage pack 15a.
- the host device 14 turns off the current limiting circuit 21 of the low voltage pack 15a to stop the current limiting operation by the current limiting circuit 21.
- the secondary battery pack 15 to be charged is switched from the high voltage pack 15b to the low voltage pack 15a.
- the charge switch 18 of the low voltage pack 15a (the charge switch 18 and the discharge switch 17 in the configuration shown in FIG. 2). ) Flows a charging current (I 3 in FIG. 2).
- charging is started while limiting the charging current flowing through one secondary battery pack 15 (low voltage pack 15a) having a low inter-terminal voltage to a certain value or less, and the other secondary battery having a high inter-terminal voltage.
- the discharge switch 17 and the charge switch 18 of the next battery pack 15 (high voltage pack 15b) are sequentially turned off, the charge switch 18 of the low voltage pack 15a is turned on, and then the current limiting operation by the current limiting circuit 21 of the low voltage pack 15a. Therefore, it is not necessary to stop the charging operation of the power storage system when switching the secondary battery pack 15 to be charged. Therefore, power generated by PV, wind power or the like is not wasted.
- the secondary battery pack 15 to be charged when the secondary battery pack 15 to be charged is switched, by limiting the charging current of the low voltage pack 15a to a certain value or less, excessive charging current flows from the high voltage pack 15b to the low voltage pack 15a, The MOSFET used as the discharge switch 17 does not generate heat abnormally. Therefore, the secondary battery pack 15 to be charged can be switched safely without stopping the charging operation.
- FIG. 3 is a flowchart showing an example of a processing procedure of the host device shown in FIG.
- FIG. 1 and 2 show a configuration example in which the power storage system includes two secondary battery packs 15, FIG. 3 illustrates an operation example in the case where the power storage system includes three or more secondary battery packs 15. . Further, FIG. 3 shows that when the charging current of the secondary battery pack 15 is smaller than the supplyable current that can be supplied from a power supply source such as PV or wind power generator, the number of secondary battery packs 15 to be charged is increased. Thus, an example of processing is shown in which the power generated by the power supply source is operated so as not to be wasted.
- a power supply source such as PV or wind power generator
- the host device 14 controls the voltage across the terminals of the secondary battery pack 15 by using the battery detection unit 16 by the control unit 19 in a state where the secondary battery pack 15 is not charged / discharged (pack). Voltage) is measured and the pack voltage is notified (step 101).
- the host device 14 obtains the remaining capacity (pack capacity) of each secondary battery pack 15 based on the inter-terminal voltage (pack voltage) notified from each secondary battery pack 15 (step 102), and the remaining capacity.
- the secondary battery pack 15 having the smallest voltage, that is, the secondary battery pack (minimum voltage pack) 15 having the lowest voltage between terminals is extracted (step 103).
- a table showing the relationship between the inter-terminal voltage and the remaining capacity of the secondary battery pack 15 is prepared in advance, and the measured value of the inter-terminal voltage is obtained by referring to the table. Can be sought.
- step 105 the host device 14 starts charging the minimum voltage pack extracted in step 103 (step 105).
- the host device 14 causes the control unit 19 to measure the charging current of the secondary battery pack 15 being charged using the current detection unit 20 (step 106), and notifies the current value.
- the host device 14 compares the value of the charging current notified from the secondary battery pack 15 being charged with the value of the supplyable current that can be supplied from the power supply source (step 107).
- the value of the suppliable current of the power supply source may be notified from a PCS (Power Conditioning System) provided in the PV, the wind power generator, or the like.
- PCS Power Conditioning System
- the host device 14 extracts the secondary battery pack (minimum voltage pack) 15 having the next lowest terminal voltage (step 108), and the secondary battery pack. 15 starts charging (step 109).
- the host device 14 again compares the value (total value) of the charging current notified from each of the secondary battery packs 15 being charged with the value of the suppliable current (step 110), and the value of the charging current (total value). ) Is smaller than the suppliable current value, the process returns to step 108 and the secondary battery pack 15 having the next lowest inter-terminal voltage is further added and charged.
- the host device 14 monitors the measured value of the voltage across the terminals of the secondary battery pack 15 being charged. While (step 111), the secondary battery pack 15 is charged until the value of the voltage between the terminals reaches a preset specified voltage (step 112).
- the specified voltage is an inter-terminal voltage that stops the charging operation for the secondary battery pack 15 and may be set to an arbitrary value as long as it is equal to or lower than the inter-terminal voltage at which the secondary battery pack 15 is fully charged.
- the host device 14 extracts the secondary battery pack 15 having the lowest inter-terminal voltage (step 113), and the secondary battery to be charged. The switching process of the battery pack 15 is started.
- the host device 14 uses the current limiting circuit 21 to keep the charging current constant for the secondary battery pack 15 having the lowest terminal voltage (hereinafter referred to as “new battery pack”). Charging is started while being limited to a value below (step 115). Subsequently, the host device 14 turns off the discharge switch 17 of the secondary battery pack 15 that has been charged (hereinafter referred to as “old battery pack”) (step 116). Further, the host device 14 turns on the charging switch 18 of the new battery pack (step 117), and then turns off the current limiting circuit 21 of the new battery pack to stop the current limiting operation (step 118). Thereafter, the process returns to step 105 and the processing of steps 105 to 118 is repeated.
- step 110 if the charging current value (total value) is equal to or greater than the suppliable current value, the process proceeds to step 111 and subsequent steps while charging a plurality of secondary battery packs 15 in parallel.
- the charging state of the secondary battery pack 15 is such that the inter-terminal voltage is sufficiently lower than the charging voltage, and the inter-terminal voltage is CC (Constant Current) region that rises almost proportionally with the passage of time, and CV (Constant Voltage) region where the voltage between terminals is close to the charging voltage, and the rising speed of the voltage between terminals is slow and slowly reaches the charging voltage
- CC Constant Current
- CV Constant Voltage
- the host device 14 monitors the voltage between the terminals of the secondary battery pack 15 being charged, and determines that the secondary battery pack 15 being charged has reached the CV region based on the value of the voltage between the terminals.
- the secondary battery pack 15 to be charged may be switched to a new battery pack.
- the secondary battery pack 15 to be charged may be switched to a new battery pack.
- the charging time of the secondary battery pack 15 can be shortened by switching the secondary battery pack 15 to be charged to a new battery pack.
- Whether the secondary battery pack 15 being charged is in the CC region or the CV region can be determined by the inter-terminal voltage as described above, and whether the secondary battery pack 15 has reached the CV region is determined by the manufacture of the secondary battery pack 15. What is necessary is just to judge based on the value (voltage between terminals) which the manufacturer, the sales maker, etc. set.
- FIG. 4 is a circuit diagram showing a configuration example of the discharge switch, the charge switch, and the current limiting circuit shown in FIG.
- the circuit shown in FIG. 4 is an example in which MOSFETs are used as the discharge switch 17 and the charge switch 18 and they are connected in series.
- a constant current circuit is used for the current limiting circuit 21.
- the constant current circuit has, for example, a configuration including a first bipolar transistor inserted in a current flow path and a second bipolar transistor that detects a current flowing through the first bipolar transistor and controls the current to a predetermined value or less.
- the charging current of the secondary battery block 11 can be limited to a certain value or less by the constant current circuit.
- FIG. 5 is a circuit diagram showing another configuration example of the discharge switch, the charge switch, and the current limiting circuit shown in FIG.
- the circuit shown in FIG. 5 is an example in which a MOSFET is used as the charge switch 18 and a relay is used as the discharge switch 17.
- the current limiting circuit 21 is configured by a constant current circuit including two bipolar transistors as in the circuit shown in FIG. Also in the circuit shown in FIG. 5, the charging current of the secondary battery block 11 can be limited to a certain value or less by the constant current circuit.
- FIG. 6 is a circuit diagram showing another configuration example of the discharge switch, the charge switch, and the current limiting circuit shown in FIG.
- the circuit shown in FIG. 6 is an example in which the discharge switch 17 and the charge switch 18 are composed of bipolar transistors and are connected in parallel.
- PNP type transistors are used as the discharge switch 17 and the charge switch 18, the transistor used as the discharge switch 17 has its emitter connected to the negative electrode of the secondary battery, and the transistor used as the charge switch 18 is its collector. Is connected to the negative electrode of the secondary battery to determine the direction of the discharge current or the charge current.
- NPN transistors may be used for the discharge switch 17 and the charge switch 18. In that case, the transistor used as the discharge switch 17 may have its collector connected to the negative electrode of the secondary battery, and the transistor used as the charge switch 18 should have its emitter connected to the negative electrode of the secondary battery.
- the current limiting circuit 21 is configured by a constant current circuit including two bipolar transistors as in the circuit shown in FIG. In the circuit shown in FIG. 6 as well, the charging current of the secondary battery block 11 can be limited to a certain value or less by the constant current circuit.
- FIG. 7 is a circuit diagram showing another configuration example of the discharge switch, the charge switch, and the current limiting circuit shown in FIG.
- the current limiting circuit 21 includes an IGBT (Insulated Gate Bipolar Transistor) and a constant current detection circuit, which are high-breakdown-voltage elements, and is configured to detect a current flowing through the IGBT by the constant current detection circuit and limit it to a predetermined value or less.
- the current limiting circuit 21 shown in FIG. 7 can also be applied to the secondary battery pack 15 having a high charge / discharge voltage, and can limit the charging current of the secondary battery block 11 to a certain value or less.
- the secondary battery pack 15 to be charged is switched while the charging current flowing to the secondary battery pack 15 having a low inter-terminal voltage is limited to a predetermined value or less by the current limiting circuit 21, so There is no need to stop the charging operation of the system. Therefore, power generated by PV, wind power or the like is not wasted. Further, by limiting the charging current to a certain value or less, an excessive charging current flows from the secondary battery pack 15 having a high inter-terminal voltage to the secondary battery pack 15 having a low inter-terminal voltage, or the MOSFET used as the discharge switch 17. Does not heat up abnormally. Therefore, it is possible to safely switch the secondary battery pack 15 to be charged.
- the secondary battery block 11 has a configuration in which 50 secondary batteries 10 are connected in series, and a secondary battery pack 15 including a total of 100 secondary batteries 10 connected in series is used. It shall be.
- the specified resistance value of the secondary battery pack 15 is 40 m ⁇ , when the two secondary battery packs 15 are directly connected, the current flowing between the secondary battery packs 15 is 1250A.
- the current limiting circuit 21 may be a circuit that limits the current to 80 A or less, for example.
- each secondary battery pack 15 is connected in parallel to realize a 100 kWh power storage system.
- the voltage between terminals of each secondary battery pack 15 is about 400V to 600V.
- the secondary battery packs 15 can be individually separated and replaced, or the secondary battery packs 15 can be added.
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Abstract
Description
充電対象となる二次電池パックを、第1の二次電池パックから該第1の二次電池パックよりも端子間電圧が低い第2の二次電池パックへ切り替えるとき、前記第2の二次電池パックの前記電流制限回路を動作させることで、前記第2の二次電池パックが備える二次電池を充電するための充電電流が流れる経路を形成し、前記充電電流を前記電流制限回路により前記一定値以下に制限させつつ前記第2の二次電池パックの充電を開始させ、前記第1の二次電池パックの放電スイッチをオフさせる上位装置と、
を有する。
情報処理装置が、
充電対象となる二次電池パックを、第1の二次電池パックから該第1の二次電池パックよりも端子間電圧が低い第2の二次電池パックへ切り替えるとき、前記第2の二次電池パックの前記電流制限回路を動作させることで、前記第2の二次電池パックが備える二次電池を充電するための充電電流が流れる経路を形成し、前記充電電流を前記電流制限回路により前記一定値以下に制限させつつ前記第2の二次電池パックの充電を開始させ、前記第1の二次電池パックの放電スイッチをオフさせる方法である。
前記二次電池の充電経路に流れる充電電流をオンオフする充電スイッチと、
前記二次電池の放電経路に流れる放電電流をオンオフする放電スイッチと、
前記充電電流を一定値以下に制限する、前記充電スイッチと並列に接続された電流制限回路と、
外部からの指示にしたがって前記充電スイッチ、前記放電スイッチ及び前記電流制限回路を制御する制御部と、
を有する。
Claims (12)
- 二次電池、前記二次電池の充電経路に流れる充電電流をオンオフする充電スイッチ、前記二次電池の放電経路に流れる放電電流をオンオフする放電スイッチ、並びに前記充電電流を一定値以下に制限する、前記充電スイッチと並列に接続された電流制限回路をそれぞれ備えた複数の二次電池パックと、
充電対象となる二次電池パックを、第1の二次電池パックから該第1の二次電池パックよりも端子間電圧が低い第2の二次電池パックへ切り替えるとき、前記第2の二次電池パックの前記電流制限回路を動作させることで、前記第2の二次電池パックが備える二次電池を充電するための充電電流が流れる経路を形成し、前記充電電流を前記電流制限回路により前記一定値以下に制限させつつ前記第2の二次電池パックの充電を開始させ、前記第1の二次電池パックの放電スイッチをオフさせる上位装置と、
を有する蓄電システム。 - 前記上位装置は、
前記第1の二次電池パックの放電スイッチをオフさせた後、前記第2の二次電池パックの充電スイッチをオンさせ、前記第1の二次電池パックの充電スイッチをオフさせ、その後、前記第2の二次電池パックの前記電流制限回路による電流制限動作を停止させる請求項1記載の蓄電システム。 - 前記上位装置は、
前記第1の二次電池パックの充電状態がCV領域に到達したとき、充電対象となる二次電池パックを、前記第1の二次電池パックから前記第2の二次電池パックへ切り替える請求項1または2記載の蓄電システム。 - 二次電池、前記二次電池の充電経路に流れる充電電流をオンオフする充電スイッチ、前記二次電池の放電経路に流れる放電電流をオンオフする放電スイッチ、並びに前記充電電流を一定値以下に制限する、前記充電スイッチと並列に接続された電流制限回路をそれぞれ備えた複数の二次電池パックに対する充電動作を制御するための二次電池パックの制御方法であって、
情報処理装置が、
充電対象となる二次電池パックを、第1の二次電池パックから該第1の二次電池パックよりも端子間電圧が低い第2の二次電池パックへ切り替えるとき、前記第2の二次電池パックの前記電流制限回路を動作させることで、前記第2の二次電池パックが備える二次電池を充電するための充電電流が流れる経路を形成し、前記充電電流を前記電流制限回路により前記一定値以下に制限させつつ前記第2の二次電池パックの充電を開始させ、前記第1の二次電池パックの放電スイッチをオフさせる二次電池パックの制御方法。 - 前記情報処理装置が、
前記第1の二次電池パックの放電スイッチをオフさせた後、前記第2の二次電池パックの充電スイッチをオンさせ、前記第1の二次電池パックの充電スイッチをオフさせ、その後、前記第2の二次電池パックの前記電流制限回路による電流制限動作を停止させる請求項4記載の二次電池パックの制御方法。 - 前記情報処理装置が、
前記第1の二次電池パックの充電状態がCV領域に到達したとき、充電対象となる二次電池パックを、前記第1の二次電池パックから前記第2の二次電池パックへ切り替える請求項4または5記載の二次電池パックの制御方法。 - 二次電池と、
前記二次電池の充電経路に流れる充電電流をオンオフする充電スイッチと、
前記二次電池の放電経路に流れる放電電流をオンオフする放電スイッチと、
前記充電電流を一定値以下に制限する、前記充電スイッチと並列に接続された電流制限回路と、
外部からの指示にしたがって前記充電スイッチ、前記放電スイッチ及び前記電流制限回路を制御する制御部と、
を有する二次電池パック。 - 前記電流制限回路は、定電流回路である請求項7記載の二次電池パック。
- 前記定電流回路に、IGBTを含む請求項8記載の二次電池パック。
- 前記充電スイッチ及び前記放電スイッチは、MOS型トランジスタであり、それらが直列に接続されている請求項7から9のいずれか1項記載の二次電池パック。
- 前記充電スイッチ及び前記放電スイッチは、バイポーラ型トランジスタであり、それらが並列に接続されている請求項7から9のいずれか1項記載の二次電池パック。
- 前記放電スイッチは、リレーである請求項7から9のいずれか1項記載の二次電池パック。
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