WO2020241439A1 - 蓄電システム - Google Patents

蓄電システム Download PDF

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Publication number
WO2020241439A1
WO2020241439A1 PCT/JP2020/020069 JP2020020069W WO2020241439A1 WO 2020241439 A1 WO2020241439 A1 WO 2020241439A1 JP 2020020069 W JP2020020069 W JP 2020020069W WO 2020241439 A1 WO2020241439 A1 WO 2020241439A1
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WO
WIPO (PCT)
Prior art keywords
voltage
power storage
switch element
capacitor
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/020069
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English (en)
French (fr)
Japanese (ja)
Inventor
洋一 影山
貴司 東出
克則 愛宕
一雄 竹中
久雄 平城
侑吾 薛
大貴 西中
司 小野寺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2021522284A priority Critical patent/JP7565485B2/ja
Priority to US17/442,556 priority patent/US12463262B2/en
Priority to CN202080034881.2A priority patent/CN113812031B/zh
Publication of WO2020241439A1 publication Critical patent/WO2020241439A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/4264—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing with capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • 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
    • 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—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
    • H02J7/52—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially for charge balancing, e.g. equalisation of charge between batteries
    • H02J7/54—Passive balancing, e.g. using resistors or parallel MOSFETs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • 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—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2105/00—Networks for supplying or distributing electric power characterised by their spatial reach or by the load
    • H02J2105/30—Networks for supplying or distributing electric power characterised by their spatial reach or by the load the load networks being external to vehicles, i.e. exchanging power with vehicles
    • H02J2105/33—Networks for supplying or distributing electric power characterised by their spatial reach or by the load the load networks being external to vehicles, i.e. exchanging power with vehicles exchanging power with road vehicles
    • H02J2105/37—Networks for supplying or distributing electric power characterised by their spatial reach or by the load the load networks being external to vehicles, i.e. exchanging power with vehicles exchanging power with road vehicles exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/96—Regulation of charging or discharging current or voltage in response to battery voltage

Definitions

  • the present invention relates to a power storage system used in various electronic devices.
  • FIG. 7 is a circuit block diagram of a conventional power storage device 1 disclosed in Patent Document 1.
  • the power storage device 1 includes a plurality of capacitor elements 2 connected in series and a charging circuit for charging the capacitor elements 2. Has 3 and.
  • the power storage device includes a power storage body, a charging circuit configured to supply a charging current to the power storage body, and a control unit connected to the power storage body.
  • the storage body is composed of a plurality of capacitor elements connected in series with each other and having both ends, a plurality of resistors connected to the plurality of capacitor elements, and a plurality of switch elements connected to the plurality of capacitor elements and the plurality of resistors. And have.
  • One of both ends of each of the plurality of capacitor elements is connected to one end of the corresponding one of the plurality of resistors.
  • the other of both ends of each capacitor element is connected to one end of one corresponding switch element of the plurality of switch elements.
  • the other end of the corresponding resistor is connected to the other end of the corresponding switch element.
  • the corresponding switch element selectively switches between a connected state in which one end of the corresponding switch element is connected to the other end and a cutoff state in which one end of the corresponding switch element is cut off from the other end. It is configured to be.
  • the control unit performs the following operations when the charging circuit supplies the charging current to the storage body.
  • the control unit shuts off one corresponding switch element.
  • the reference voltage rises as each capacitor element is charged.
  • the control unit connects one corresponding switch element, and then connects each capacitor element.
  • the corresponding switch element is switched from the connected state to the cutoff state.
  • This power storage device can be miniaturized.
  • FIG. 1 is a circuit block diagram of a power storage system according to an embodiment.
  • FIG. 2 is a circuit block diagram showing a configuration of a vehicle equipped with a power storage system according to the embodiment.
  • FIG. 3 is a diagram showing a storage voltage and a charging time of the power storage system according to the embodiment.
  • FIG. 4 is a diagram showing a storage voltage and a charging time of the power storage system according to the embodiment.
  • FIG. 5 is a diagram showing a storage voltage and a charging time of the power storage system according to the embodiment.
  • FIG. 6 is a circuit block diagram of another vehicle equipped with the power storage system according to the embodiment.
  • FIG. 7 is a circuit block diagram of a conventional power storage device.
  • FIG. 1 is a circuit block diagram of the power storage system 11 according to the embodiment.
  • the power storage system 11 includes a power storage body 13 having a plurality of power storage units 12 connected in series with each other, a charging circuit 14 for supplying or cutting off a charging current to the power storage body 13, and a control unit connected to the power storage unit 12. Including 15.
  • Each storage unit 12 has a capacitor element 16 and a voltage adjusting circuit 17 connected in parallel to the capacitor element 16.
  • the voltage adjusting circuit 17 has a series body including a resistor 18 and a switch element 19 connected in series with each other.
  • the control unit 15 detects the storage voltage between both ends of the capacitor element 16 of each storage unit 12.
  • the control unit 15 compares the stored voltage of all of the plurality of power storage units 12 with the reference voltage that rises as charging progresses. Further, the control unit 15 obtains the difference between the storage voltage of each storage unit 12 and the reference voltage. Further, the control unit 15 switches the switch element 19 of the storage unit 12 in which the difference between the storage voltage and the reference voltage becomes larger than the predetermined voltage difference value Vz1 from the cutoff state in the initial state to the connection state. After that, when the difference between the power storage unit 12 to which the switch element 19 is connected and the reference voltage becomes smaller than the predetermined voltage difference value Vz2, the switch element 19 is switched from the connected state to the cutoff state.
  • the charging current flowing through the storage unit 12 whose storage voltage has risen significantly above the reference voltage due to charging is suppressed. Therefore, the rise of the stored voltage is temporarily slowed down. Alternatively, the stored voltage does not rise temporarily. Then, if necessary, the current before the charging current is suppressed can be supplied again to continue charging, and the power storage unit 12 can be charged with an appropriate voltage that does not excessively increase.
  • the charging circuit 3 charges the voltage across the plurality of capacitor elements 2 to, for example, 10 V
  • the individual capacitor elements 2 are each charged to 2.5V.
  • the voltage at which the individual capacitor elements 2 are charged also differs.
  • the rated voltage of each capacitor element 2 is 2.5 V
  • the deterioration of the capacitor element 2 charged to the rated voltage or higher progresses faster than that of the other capacitor elements 2, and the storage performance of the power storage device 1 as a whole May deteriorate early.
  • the storage voltage applied to each capacitor element 2 is set lower than the rated voltage of the capacitor element 2 while maintaining the voltage across the plurality of capacitor elements 2 connected in series. , Increase the number of capacitor elements 2 of Fukusui. As a result, deterioration of the storage performance of the individual capacitor elements 2 and the storage performance of the power storage device 1 as a whole can be suppressed.
  • each capacitor element 2 becomes low, so that the number of capacitor elements 2 connected in series to obtain a predetermined voltage may increase and the power storage device 1 may become large.
  • the power storage system 11 in the embodiment can be miniaturized as described above.
  • FIG. 2 is a circuit block diagram of a vehicle 20 equipped with a power storage system 11.
  • the power storage system 11 is mounted on the vehicle body 21 of the vehicle 20.
  • the charging circuit 14 is provided in the power supply path from the vehicle storage battery 22 to the storage body 13. In other words, the charging circuit 14 is provided in the charging path from the vehicle storage battery 22 to the storage body 13.
  • a semiconductor switch is preferably used for the switch element 19, and a bipolar transistor or a monopolar transistor such as a FET (field effect transistor) is used.
  • the capacitor element 16 for example, an electric double layer capacitor or a lithium ion capacitor is preferably used. Since these capacitors have a low internal resistance value and can output a large current in a short time, the power storage system 11 can supply electric power for driving various vehicle loads 26.
  • the control terminal 19c of the switch element 19 is connected to the control unit 15.
  • the control unit 15 is activated by an activation signal S1 transmitted from a vehicle activation switch 23 provided on the vehicle body 21 of the vehicle 20.
  • the vehicle start switch 23 may be a switch linked to the start of the vehicle 20.
  • the start signal S1 is transmitted from the signal generator 24 when the passenger of the vehicle 20 operates the vehicle start switch 23.
  • the power storage system 11 includes a power storage body 13, a charging circuit 14 configured to supply a charging current to the power storage body 13, and a control unit 15 connected to the power storage body 13.
  • the storage body 13 includes a plurality of capacitor elements 16 (16a to 16d) connected in series with each other and having both ends, a plurality of resistors 18 connected to the plurality of capacitor elements 16 (16a to 16d), and a plurality of capacitors. It has elements 16 (16a to 16d) and a plurality of switch elements 19 connected to a plurality of resistors 18. One of both ends of each of the plurality of capacitor elements 16 (16a to 16d) 16 (16a to 16d) is connected to one end of the corresponding one of the plurality of resistors 18. There is.
  • each of the capacitor elements 16 (16a to 16d) is connected to one end of one corresponding switch element 19 among the plurality of switch elements 19.
  • the other end of the corresponding one resistor 18 is connected to the other end of the corresponding one switch element 19.
  • the corresponding switch element 19 has a connection state in which one end of the corresponding switch element 19 is connected to the other end and a cutoff state in which one end of the corresponding switch element 19 is cut off from the other end. It is configured to be selectively switched to and.
  • the control unit 15 is activated by receiving the activation signal S1 transmitted from the vehicle activation switch 23 provided on the vehicle body 21.
  • the vehicle start switch 23 may be a switch linked to the start of the vehicle 20.
  • the activation signal S1 is transmitted when the passenger of the vehicle 20 operates the vehicle activation switch 23.
  • the control unit 15 detects the storage voltage at both ends of the capacitor element 16 of each storage unit 12.
  • the control unit 15 may further detect the potential difference between the end portions 13A and 13B of the storage body 13.
  • the control unit 15 When the control unit 15 receives the start signal S1, the control unit 15 detects the stored voltage across the capacitor element 16. Before the vehicle 20 starts, the voltage stored in the power storage body 13 and the power storage unit 12 is an initial voltage equal to or lower than a predetermined voltage in order to suppress the deterioration progress of the capacitor element 16. In other words, when the vehicle 20 is not started, the capacitor element 16 is in a state of being charged with a low voltage. When the control unit 15 receives the start signal S1, the control unit 15 operates the charging circuit 14. Then, electric power is supplied to the power storage unit 12.
  • the timing at which the charging circuit 14 is activated and the timing at which the voltage of the power storage unit 12 is detected may be earlier or at the same time. Since it is a normal operation for the control unit 15 to operate the charging circuit 14 in response to the storage voltage of the storage unit 12, the voltage detection of the storage unit 12 may be performed before the activation of the charging circuit 14. desirable.
  • the switch element 19 is in the cutoff state as the initial state in the power storage unit 12. Further, the initial voltage Vint of the capacitor element 16 is set to a voltage as low as about 20% or 30% of the fully charged voltage or the rated voltage, which is unlikely to deteriorate even when left for a long time as described above. ..
  • the power storage unit 12 is charged.
  • the control unit 15 operates the charging circuit 14
  • electric power is supplied to each of the power storage units 12.
  • the switch elements 19 in all the storage units 12 described above continue to be in the cutoff state, which is the initial state. All of the charging current flowing through each storage unit 12 flows through each capacitor element 16. In other words, at this time, no current flows through the voltage adjusting circuit 17 connected in parallel to the capacitor element 16.
  • FIG. 3 is a characteristic diagram showing the storage voltage Vc and the charging time of the power storage unit 12 of the power storage system 11 according to the embodiment.
  • Vc which is the voltage between both ends of each storage unit 12, that is, both ends 161 and 162 of the capacitor element 16 rises with time.
  • Capacitor elements 16, resistors 18, and switch elements 19 having substantially the same characteristics are used in the plurality of power storage units 12 connected in series with each other.
  • the storage voltage Vc shown in FIG. 3 is a voltage between both ends of any one of the plurality of storage units 12, for example, among the four storage units 12a to 12d in FIG. 2, the storage voltage Vc. Is the storage voltage Vca between both ends of the power storage unit 12a. In other words, among the plurality of capacitor elements 16a to 16d, the curve of the storage voltage Vc is the storage voltage Vca between both ends of the capacitor element 16a.
  • FIG. 3 shows the storage voltage Vc of the power storage unit 12a.
  • the storage voltage Vcd between both ends of the power storage unit 12d (capacitor element 16d) changes in the same manner as the storage voltage Vca (Vc) shown in FIG.
  • the storage voltages Vca to Vcd between the both ends of the storage units 12a to 12d are detected at the same time.
  • the storage voltages Vca to Vcd of the storage units 12a to 12d are detected at different timings.
  • the control unit 15 may detect the storage voltage Vcc of the power storage unit 12a, then detect the storage voltage Vcc of the power storage unit 12b, then detect the storage voltage Vcc of the power storage unit 12c, and then store the power.
  • the storage voltage Vcd of the storage unit 12d is detected.
  • the storage voltages Vca to Vcd between both ends of the storage units 12a to 12d are detected so as to detect the storage voltage Vca of the storage unit 12a.
  • the burden on the operation of the control unit 15 is reduced.
  • the control unit 15 compares the storage voltage Vc (Vca) of the storage unit 12a, for example, with the reference voltage Vr.
  • the reference voltage Vr increases as the charging time of the storage body 13, that is, the storage units 12a to 12d (capacitor elements 16a to 16d) progresses.
  • the reference voltage Vr is preferably set after being stored in advance by the control unit 15 based on the typical characteristics of the capacitor element 16. As the reference voltage Vr, the lower limit value of the storage voltage rise rate at the time of constant current charging among the plurality of capacitor elements 16 may be used.
  • the reference voltage Vr it is possible to use the storage voltage of the capacitor element 16 in which the storage voltage is the most difficult to increase in the allowable characteristic values of the plurality of capacitor elements 16.
  • the charging circuit 14 in this embodiment supplies electric power to the storage body 13 with a constant current charging current Ic to charge the capacitor element 16 of the storage unit 12, the characteristic of the lower limit of the characteristics of the capacitor element 16
  • the locus of the value corresponding to the smallest increase rate of the stored voltage per unit time is used as the locus of the reference voltage Vr.
  • FIG. 3 shows an average value Vav of the rate of increase of the storage voltage Vc in the plurality of capacitor elements 16 used in the storage body 13.
  • the unit 15 switches the switch element 19 of the voltage adjusting circuit 17 in the power storage unit 12a from the cutoff state, which is the initial state, to the connected state.
  • control unit 15 switches the switch element to the control terminal 19c of the switch element 19 in the power storage unit 12a in which the difference Vd1 between the value Vc1 of the storage voltage Vc and the value Vr1 of the reference voltage Vr becomes larger than the voltage difference value Vz1.
  • a signal is sent to connect 19 to the connected state.
  • the control unit 15 stops transmitting a signal for maintaining the cutoff state to the control terminal 19c of the switch element 19 in the power storage unit 12a.
  • the capacitor element 16 is connected in parallel with the resistor 18 in the power storage unit 12a.
  • the charging current flowing through the capacitor element 16 becomes smaller because the charging current is diverted to the resistor 18, or the charging circuit 14 charges the capacitor element 16 of the storage unit 12a and the capacitor element 16 of the storage unit 12a. The discharge from the capacitor 18 to the resistor 18 proceeds in parallel.
  • the storage voltage Vc of the power storage unit 12a to which the switch element 19 is connected is unlikely to rise.
  • the value of the resistor 18 in the storage unit 12a is set so that the rate of increase of the storage voltage Vc is smaller than the rate of increase of the reference voltage Vr.
  • the control unit 15 switches the switch element 19 of the voltage adjustment circuit 17 in the power storage unit 12a from the connected state to the cutoff state.
  • the voltage difference value Vz2 may be a negative value.
  • the switch element 19 is switched from the connected state to the cutoff state because the stored voltage Vc becomes lower than the reference voltage Vr and the stored voltage Vc changes to the reference voltage Vr.
  • the difference Vd (Vc ⁇ Vr) obtained by subtracting the above becomes a negative value and becomes smaller than the voltage difference value Vz2.
  • the difference Vd obtained by subtracting the reference voltage Vr from the stored voltage Vc and the voltage difference value Vz2 are both negative values, and before timing T2, the absolute value of the difference Vd is less than or equal to the absolute value of the voltage difference value Vz2. Yes, at the timing T2, the absolute value of the difference Vd becomes larger than the absolute value of the voltage difference value Vz2.
  • the control unit 15 shuts off the switch element 19 at the timing T2 when the difference Vd between the stored voltage Vc and the reference voltage Vr becomes smaller than the voltage difference value Vz2.
  • the value of the stored voltage Vc at the timing T2 is the value Vc2
  • the value of the reference voltage Vr is the value Vr2.
  • the control unit 15 stops transmitting a signal to the control terminal 19c of the switch element 19 in the power storage unit 12a to maintain the connection state of the switch element 19.
  • the control unit 15 sends a signal for shutting off the switch element 19 to the control terminal 19c of the switch element 19 in the power storage unit 12a.
  • the stored voltage Vc rises again at a higher rate than the reference voltage Vr.
  • the unit 15 switches the switch element 19 of the voltage adjustment circuit 17 in the power storage unit 12a from the cutoff state to the connected state.
  • the voltage of the specific power storage unit 12 among the plurality of power storage units 12 does not become a prominently different value with respect to the voltage of the other power storage unit 12, and the voltage of all the power storage units 12 is approximated. After that, charging proceeds. Further, the reference voltage Vr is used as a comparison target as a value at which the charging speed of the capacitor element 16 is slow. Therefore, the stored voltage Vc is unlikely to be in an overcharged state. Alternatively, even if the stored voltage Vc is in an overcharged state, that state is suppressed in an extremely short time.
  • the charging of the storage unit 12 proceeds while always maintaining a value close to the storage voltage Vc and the reference voltage Vr. Therefore, it is desirable to set the voltage difference value Vz1 as a small positive value. However, in order to stabilize the operation of the power storage system 11, it is desirable that the voltage difference value Vz1 is larger than the voltage difference value Vz2. As a result, the capacitor element 16 of the storage unit 12 is charged within an appropriate range between the storage voltage Vc and the reference voltage Vr while suppressing the value of the storage voltage Vc from being too far from the reference voltage Vr.
  • the reference voltage Vr described above is a lower limit value that can occur within the range of the characteristics of the capacitor element 16.
  • the reference voltage Vr may be set to, for example, the lowest value among the plurality of power storage units 12.
  • the control unit 15 detects the voltage of all the power storage units 12 at the timing T0 before the timing T1. At timing T0, it is desirable that the storage voltage Vc of all the storage units 12 is detected at the same time.
  • the control unit 15 compares the storage voltage Vc of all the storage units 12 detected at the timing T0 with the reference voltage Vr. Here, if the storage voltage Vca of the power storage unit 12a is the lowest among the storage voltage Vc of the plurality of power storage units 12, the reference voltage Vr is set to the storage voltage Vcq of the power storage unit 12a detected after the timing T0. ..
  • the period in which the reference voltage Vr is set to the storage voltage Vca of the power storage unit 12a is from the timing T0 as described above until the vehicle start switch 23 is switched from on to off and the vehicle 20 starts and stops. Then, when the vehicle 20 is restarted next time, even if the lowest value among the stored voltage Vc of the plurality of storage units 12 detected at the timing T0 after the vehicle 20 is restarted is set to the reference voltage Vr. Good.
  • the initial voltage Vint of all the capacitor elements 16 corresponding to the storage voltage Vc of all the storage units 12 is set when the control unit 15 receives the start signal S1 or the start signal S1. It is desirable that the values are substantially the same during the period from the time of reception to the timing T0.
  • the control unit 15 may operate the charging circuit 14 and the voltage adjusting circuit 17 to match the initial voltage Vints of all the plurality of capacitor elements 16.
  • the initial voltage Vints of all the plurality of capacitor elements 16 may be matched by operating the discharge circuit and the voltage adjustment circuit 17 described later by the control unit 15.
  • the storage voltage Vc of the specific storage unit 12 does not become a prominently different value from the storage voltage Vc of the other storage unit 12, and the storage voltage Vc of all the storage units 12 is close to each other. After that, charging of the capacitor element 16 proceeds. Further, the storage voltage Vc of the capacitor element 16 having the slowest charging speed as the reference voltage Vr is compared with the storage voltage Vc of the other storage unit 12. Therefore, the storage voltage Vc makes it difficult to overcharge the capacitor element 16. Alternatively, even if the storage voltage Vc causes the capacitor element 16 to be overcharged, that state is suppressed in an extremely short time, and the progress of deterioration of the capacitor element 16 is suppressed.
  • the reference voltage Vr which is a reference for comparison, is set based on the value of the storage voltage Vc of the capacitor element 16 arranged in the power storage system 11.
  • Vc the storage voltage of the capacitor element 16 arranged in the power storage system 11.
  • the reference voltage Vr may be set to the average value Vav of the storage voltage Vc of all the storage units 12. Each time the control unit 15 detects the storage voltage Vc of the power storage unit 12, the control unit 15 obtains the average value Vav of the storage voltage Vc by calculation. In this case, the reference voltage Vr fluctuates finely according to the fluctuation of the storage voltage Vc of each storage unit 12.
  • the control unit 15 compares the difference Vd between the value of the stored voltage Vc and the reference voltage Vr with the predetermined voltage difference value Vz
  • the reference voltage Vr increases in the voltage difference value Vz. It may be made smaller accordingly.
  • the voltage difference value Vz1 compared with the difference Vd1 at the timing T1 is the voltage difference value Vz3 compared with the difference Vd3 at the timing T3 in which the charging state of the power storage unit 12 progresses and the storage voltage Vc rises. It is desirable to make it larger than.
  • the power storage body 13 can be charged while suppressing the deterioration of the power storage unit 12.
  • the voltage difference values Vz1 and Vz3 may be the same as each other.
  • the control unit 15 performs the following operations when the charging circuit 14 supplies the charging current Ic to the power storage body.
  • the control unit 15 compares the stored voltage Vc between both ends of each capacitor element 16 with the reference voltage Vr that rises as each capacitor element 16 is charged.
  • the control unit 15 shuts off the corresponding switch element 19.
  • the control unit 15 connects the corresponding switch element 19 and thereafter.
  • the corresponding switch element 19 is switched from the connected state to the cutoff state.
  • the predetermined voltage difference value Vz1 is larger than the predetermined voltage difference value Vz2.
  • the predetermined voltage difference value Vz1 may decrease as the reference voltage Vr rises.
  • the reference voltage Vr is determined according to the storage voltage Vc between both ends of the plurality of capacitor elements 16.
  • the reference voltage Vr may be the lowest value among the stored voltage Vc between both ends of the plurality of capacitor elements 16.
  • the reference voltage Vr may be the average value Vav of the stored voltage Vc between both ends of the plurality of capacitor elements 16.
  • FIG. 4 is a diagram showing the characteristics of the storage voltage Vc and the charging time in this operation of the power storage system 11.
  • the same reference numerals are given to the same items as those shown in FIG. 4
  • the upper limit voltage Vm1 and the upper limit voltage Vm2 are used as reference for operation.
  • the upper limit voltage Vm2 is higher than the upper limit voltage Vm1.
  • the upper limit voltage Vm2 is set to a value substantially equal to or lower than the rated voltage.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13.
  • the reference voltage Vr reaches the upper limit voltage Vm1 at the timing T9.
  • a preset value was used for the reference voltage Vr based on the typical characteristics of the capacitor element 16, or the average value Vav of the storage voltage Vc of all the storage units 12 was used for the reference voltage Vr. In this case, almost all the storage units 12 are charged with a storage voltage Vc close to the upper limit voltage Vm1.
  • the power storage system 11 operates in the following process, for example.
  • the control unit 15 compares the reference voltage Vr with the upper limit voltage Vm1 in parallel with the charging circuit 14 supplying the charging current Ic to the storage body 13. Further, the control unit 15 compares the storage voltage Vc of each storage unit 12 with the upper limit voltage Vm2 in parallel with the charging circuit 14 supplying the charging current Ic to the storage body 13. In other words, when the control unit 15 is performing the second step, it is simultaneously performing the determination required in the third step.
  • the control unit 15 When the control unit 15 detects at the timing T5 that the storage voltage Vc of any one of the plurality of power storage units 12 is higher than the upper limit voltage Vm2, the control unit 15 transmits the storage unit 13 from the charging circuit 14. The supply of the charging current Ic to is stopped. Alternatively, when the control unit 15 detects at the timing T5 that the storage voltage Vc has reached the upper limit voltage Vm2 in any one of the plurality of power storage units 12, the control unit 15 transmits the storage unit 13 from the charging circuit 14. The supply of the charging current Ic to is stopped.
  • the operation when the storage voltage Vca of the capacitor element 16a of the storage unit 12a among the storage units 12a to 12d (12) in FIG. 3 becomes higher than the upper limit voltage Vm2 or reaches the upper limit voltage Vm2 will be described.
  • control unit 15 When the control unit 15 detects at the timing T5 that the storage voltage Vca of the power storage unit 12a among the plurality of power storage units 12 is higher than the upper limit voltage Vm2, the control unit 15 receives the power storage body from the charging circuit 14 as described above. The supply of the charging current Ic to 13 is stopped. Alternatively, when the control unit 15 detects at the timing T5 that the storage voltage Vca of the power storage unit 12a among the plurality of power storage units 12 has reached the upper limit voltage Vm2, the control unit 15 receives the power storage body from the charging circuit 14 as described above. The supply of the charging current Ic to 13 is stopped.
  • control unit 15 switches the switch element 19 of the power storage unit 12a from the cutoff state to the connected state, and maintains the switch elements 19 of the other power storage units 12b to 12d in the cutoff state.
  • the charging circuit 14 stops the supply of electric power to the storage body 13.
  • the switch element 19 is connected at the timing T5
  • the capacitor element 16a is discharged to the resistor 18, and the storage voltage Vca of the power storage unit 12a decreases regardless of the value of the resistance 18, but the storage voltage Vca of the power storage unit 12a Decreases at a rate of descent according to the value of the resistor 18.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state.
  • the capacitor elements 16b to 16d of the power storage units 12b to 12d other than the power storage unit 12a among the plurality of power storage units 12 are neither charged nor discharged.
  • the reference voltage Vr does not fluctuate and becomes constant.
  • a preset value is used for the reference voltage Vr based on the typical characteristics of the capacitor element 16, or the lowest value among the storage voltage Vc of the plurality of storage units 12 is applied to the reference voltage Vr. If so, the reference voltage Vr does not substantially fluctuate during the period PT56.
  • the capacitor element 16 of the power storage unit 12 is not charged above the rated voltage or the full charge voltage, and the storage voltage Vc of the capacitor elements 16 of all the power storage units 12 is close to the full charge voltage. It becomes a value, and it becomes possible to make the charged state close to the fully charged state. Then, the deterioration progress of the capacitor element 16 is suppressed.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state at the timing T6, and supplies the charging current Ic from the charging circuit 14 to the power storage body 13.
  • the storage voltage Vc and the reference voltage Vr of all the power storage units 12 including the power storage unit 12a start to rise again.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the capacitor body 13.
  • the control unit 15 detects that the storage voltage Vc of the capacitor element 16 of the capacitor element 16 of any one of the plurality of storage units 12 has increased and reached the upper limit voltage Vm2 at the timing T7, the control unit 15 causes the control unit 15. The supply of the charging current Ic from the charging circuit 14 to the storage body 13 is cut off.
  • the storage unit 12 of the capacitor element 16 having the storage voltage Vc that reaches the upper limit voltage Vm2 earliest at the timings T5 and T7 is the same. Therefore, even at the timing T7, assuming that the storage voltage Vc in FIG. 3 is the storage voltage Vca of the storage unit 12a, the storage voltage Vca of the storage unit 12a becomes higher than the upper limit voltage Vm2 or reaches the upper limit voltage Vm2. The operation will be described.
  • control unit 15 When the control unit 15 detects at the timing T7 that the storage voltage Vca of the power storage unit 12a among the plurality of power storage units 12 is higher than the upper limit voltage Vm2, the control unit 15 receives the power storage body from the charging circuit 14 as described above. The supply of the charging current Ic to 13 is stopped. Alternatively, when the control unit 15 detects at the timing T7 that the storage voltage Vca of the power storage unit 12a among the plurality of power storage units 12 has reached the upper limit voltage Vm2, the control unit 15 receives the power storage body from the charging circuit 14 as described above. The supply of the charging current Ic to 13 is stopped.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the cutoff state to the connected state, and keeps the switch elements 19 of the other power storage units 12b to 12d in the cutoff state. Similar to the timing T5, in the timing T7, as described above, the charging circuit 14 does not supply power to the power storage body 13. Therefore, when the switch element 19 of the power storage unit 12a is connected at the timing T7, the capacitor element 16a is discharged to the resistor 18, and the capacitor element 16a storage voltage Vca of the power storage unit 12a decreases regardless of the value of the resistor 18. However, the storage voltage Vca of the storage unit 12a decreases at a rate of decrease according to the value of the resistor 18.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state.
  • the operation of the switch element 19 of the power storage unit 12a and the operation of the charging circuit 14 in the period PT56 from the timing T5 to the timing T6 are the operation and charging of the switch element 19 of the power storage unit 12a in the period PT78 from the timing T7 to the timing T8.
  • the operation is the same as that of the circuit 14.
  • the value of the reference voltage Vr at the timing T8 is higher than that of the timing T6. In other words, the value of the reference voltage Vr at the timing T8 is closer to the upper limit voltage Vm1 than that of the timing T6.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state, and the like.
  • the switch elements 19 of the power storage units 12b to 12d of the above are maintained in a cutoff state.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state, and switches the other power storage units 12b to 12d.
  • the element 19 is maintained in a cutoff state.
  • control unit 15 supplies the charging current Ic from the charging circuit 14 to the storage body 13.
  • the storage voltage Vc (Vca to Vcd) and the reference voltage Vr of the capacitor elements 16 (16a to 16d) of all the power storage units 12 (12a to 12d) including the power storage unit 12a start to rise again.
  • the reference voltage Vr rises and reaches the upper limit voltage Vm1 at the timing T9.
  • the timing T9 as described above, when a preset value is used for the reference voltage Vr based on the typical characteristics of the capacitor element 16, or when the reference voltage Vr is used for all the storage units 12 When the average value Vav of the storage voltage Vc is used, the capacitor elements 16 of almost all the storage units 12 are charged with the storage voltage Vc having a value close to the upper limit voltage Vm1.
  • the above operation in which the switch element 19 is connected and the charging circuit 14 is cut off is repeated twice in the period PT56 of timings T5 to T6 and the period PT78 of timings T7 to T8.
  • the number of times this operation is performed varies depending on the set values of the upper limit voltage Vm1 and the upper limit voltage Vm2. Therefore, the operation in which the switch element 19 is connected and the charging circuit 14 is cut off may be completed once in the period PT56, or may be repeated not only twice but three times or more as described above. ..
  • one of both ends of a certain capacitor element 16a of the plurality of capacitor elements 16 (16a to 16d) is connected to one end of a certain resistor 18 of the plurality of resistors 18.
  • the other end of the capacitor element 16a is connected to one end of the switch element 19 among the plurality of switch elements 19.
  • the other end of a resistor 18 is connected to the other end of a switch element 19.
  • a certain switch element 19 is selectively switched between a connected state in which one end of the certain switch element 19 is connected to the other end and a cutoff state in which one end of the certain switch element 19 is cut off from the other end. It is configured.
  • the control unit 15 When the charging circuit 14 supplies the charging current Ic to the storage body 13, the control unit 15 has a predetermined upper limit voltage Vm2 in which the storage voltage Vca between both ends of a certain capacitor element 16a is higher than the predetermined upper limit voltage Vm1. When it reaches, the supply of the charging current Ic from the charging circuit 14 to the storage body 13 is stopped, and a certain switch element 19 is connected. After that, when the storage voltage Vca of the capacitor element 16a becomes lower than the predetermined upper limit voltage Vm1, the control unit 15 switches the switch element 19 from the connected state to the cutoff state, and from the charging circuit 14 to the storage body 13 The supply of the charging current Ic to the is started.
  • FIG. 5 is a diagram showing the characteristics of the storage voltage Vc and the charging time in the operation of the child of the power storage system 11, and the same items as those shown in FIGS. 3 and 4 in FIG. 5 are designated by the same reference numerals.
  • the rated voltage of the capacitor element 16 of the power storage unit 12 may be a full charge voltage.
  • the upper limit voltage Vm1 and the upper limit voltage Vm2 are used as reference for operation.
  • the upper limit voltage Vm2 is higher than the upper limit voltage Vm1.
  • the upper limit voltage Vm2 is substantially the same as or lower than the rated voltage.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13.
  • the reference voltage Vr reaches the upper limit voltage Vm1 at the timing T10.
  • a preset value is used for the reference voltage Vr based on the typical characteristics of the capacitor element 16, or when the reference voltage Vr is the storage voltage Vc of the capacitor elements 16 of all the storage units 12.
  • the average value Vav is used, almost all the storage units 12 are charged with the storage voltage Vc having a value close to the upper limit voltage Vm1.
  • the power storage system 11 operates in the following home.
  • the control unit 15 compares the reference voltage Vr with the upper limit voltage Vm1 in parallel with the charging circuit 14 supplying the charging current Ic to the storage body 13. Further, the control unit 15 compares the storage voltage Vc of the power storage unit 12 with the upper limit voltage Vm2 in parallel with the charging circuit 14 supplying the charging current Ic to the power storage body 13. In other words, when the control unit 15 is performing the second step, it is simultaneously performing the determination required in the third step.
  • the control unit 15 When the control unit 15 detects at the timing T5 that the storage voltage Vc of the capacitor element 16 of any one of the plurality of power storage units 12 becomes higher than the upper limit voltage Vm2, the control unit 15 charges the charging circuit. The supply of the charging current Ic from the 14 to the storage body 13 is stopped. Alternatively, when the control unit 15 detects that the "storage voltage Vc of the capacitor element 16 has reached the upper limit voltage Vm2" of any one of the plurality of storage units 12, the control unit 15 stores electricity from the charging circuit 14. The supply of the charging current Ic to the body 13 is stopped.
  • the storage voltage Vc in FIG. 3 is the storage voltage Vca of the storage unit 12a
  • the storage voltage Vca of the storage unit 12a is higher than the upper limit voltage Vm2 at the timing T5. The operation when the voltage becomes high or the upper limit voltage Vm2 is reached will be described below.
  • the control unit 15 When the control unit 15 detects at the timing T5 that the storage voltage Vca of the capacitor element 16a of the storage unit 12a among the plurality of storage units 12 has reached the upper limit voltage Vm2, the control unit 15 transfers the charging circuit 14 to the storage body 13. The supply of the charging current Ic is stopped. Further, the control unit 15 switches the switch element 19 of the power storage unit 12a from the cutoff state to the connected state, and maintains the switch elements 19 of the other power storage units 12b to 12d in the cutoff state. At the timing T5, as described above, the charging circuit 14 stops the power supply to the storage body 13.
  • the capacitor element 16a is in a state of discharging to the resistor 18, and the storage voltage Vc of the power storage unit 12a decreases regardless of the value of the resistance 18, but the resistance It decreases at a rate of decrease according to the value of 18.
  • the control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state.
  • the control unit 15 switches the switch element 19 from the connected state to the cutoff state, and the switch elements of the other power storage units 12b to 12d. Keep 19 in a shut-off state.
  • the capacitor elements 16b to 16d of the power storage units 12b to 12d other than the power storage unit 12a among the plurality of power storage units 12 are neither charged nor discharged.
  • the reference voltage Vr does not fluctuate and becomes constant.
  • a preset value is used for the reference voltage Vr based on the typical characteristics of the capacitor element 16, or the lowest value among the storage voltage Vc of the plurality of storage units 12 is applied to the reference voltage Vr. If so, the reference voltage Vr does not substantially fluctuate during the period PT56.
  • control unit 15 switches the switch element 19 of the power storage unit 12a from the connected state to the cutoff state at the timing T6 to maintain the switch elements 19 of the other power storage units 12b to 12d in the cutoff state, and the control unit 15 keeps the switch element 19 in the cutoff state.
  • the charging current Ic is supplied from the charging circuit 14 to the storage body 13.
  • the storage voltages Vca to Vcd (Vc) and the reference voltage Vr of the capacitor elements 16a to 16d (16) of all the storage units 12a to 12d (12) including the power storage unit 12a begin to rise.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13 to store the storage. Charging of the body 13 is completed.
  • the timing T10 at which the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13 is preferably the timing at which the reference voltage Vr reaches the upper limit voltage Vm1.
  • the reference voltage Vr is lower than the storage voltage Vc of the power storage unit 12a. Therefore, at the timing when the reference voltage Vr reaches the upper limit voltage Vm1, the storage voltage Vc of the storage unit 12a has already reached the upper limit voltage Vm1.
  • the control unit 15 stops the supply of the charging current Ic from the charging circuit 14 to the storage body 13. The charging of the power storage body 13 is completed.
  • the capacitor element 16 of the power storage unit 12 is not charged above the rated voltage or the full charge voltage, and the storage voltage Vc of the capacitor elements 16 of all the power storage units 12 is close to each other and reaches the full charge voltage.
  • the values are close to each other, and the capacitor element 16 can be charged. As a result, the deterioration progress of the capacitor element 16 is suppressed.
  • the control unit 15 When the charging circuit 14 supplies the charging current Ic to the storage body 13, the control unit 15 has a predetermined upper limit voltage Vm2 in which the storage voltage Vca between both ends of a certain capacitor element 16a is higher than the predetermined upper limit voltage Vm1. When it reaches, the supply of the charging current Ic from the charging circuit 14 to the storage body 13 is stopped, and a certain switch element 19 is connected. After that, when the storage voltage Vca of the capacitor element 16a becomes lower than the reference voltage Vr, the control unit 15 switches the switch element 19 from the connected state to the cutoff state, and transfers the charging circuit 14 to the storage body 13. The supply of the charging current Ic is started.
  • FIG. 6 is a circuit block diagram of the vehicle 20 equipped with the power storage system 11 according to the embodiment.
  • the power storage system 11 further has a discharge circuit 25, and discharges the electric power stored in the power storage body 13 to the vehicle load 26 via the discharge circuit 25.
  • the power storage system 11 uses the discharge circuit 25 to temporarily and temporarily supply electric power having a large current density to the vehicle load 26 in an emergency such as when the vehicle storage battery 22 is damaged.
  • the power storage body 13 also supplies power to the control unit 15 so that the control unit 15 can be driven.
  • the discharge circuit 25 supplies electric power to the vehicle load 26 in an emergency or the like
  • the electric power storage system 11 substantially runs out of electric power regardless of the electric power remaining in the electric power storage unit 12 and the electric power storage body 13.
  • the discharge circuit 25 particularly as a boost converter
  • the boost operation is performed even if the control unit 15 can operate. Can't.
  • the voltage maintenance circuit 27 is set when the start of the vehicle 20 is stopped or thereafter so that the power storage system 11 can operate immediately when the drive of the vehicle 20 is completely stopped and then restarted. It operates and discharges after leaving a predetermined electric power in the power storage body 13.
  • the electric power or voltage left in the storage body 13 is a value equal to or lower than the initial voltage or the initial voltage described above in which deterioration of the capacitor element 16 of the storage unit 12 constituting the storage body 13 is unlikely to progress.
  • the remaining voltage is equal to or lower than the initial voltage or the initial voltage, it is not easy to completely avoid the deterioration of the capacitor element 16 due to the existence of the initial voltage for a long period of time.
  • the power storage voltages Vc of all the power storage units 12 are close to each other and are maintained even when left for a long period of time. Therefore, the deterioration of the characteristics caused by being left at a low voltage for a long period of time also proceeds in a state of being close to each other in all the capacitor elements 16. In other words, the sudden decrease in charge / discharge capacity of the power storage system 11 caused by the prominent deterioration of some of the capacitor elements 16 is suppressed. As a result, the power storage system 11 can perform an appropriate discharge operation even when the discharge circuit 25 is used to temporarily and temporarily supply electric power having a large current density to the vehicle load 26 in an emergency such as when the vehicle storage battery 22 is damaged. It will be possible.
  • control unit 15 In the above embodiment, a single control unit 15 is in charge of controlling all of them, but the functions of the control unit 15 may be distributed and arranged in a plurality of control circuits, and a plurality of control circuits may be distributed. May be generically referred to as the control unit 15.
  • Power storage system 12 12a to 12d Power storage unit 13 Storage unit 14 Charging circuit 15 Control unit 16, 16a to 16d Capacitor element 17 Voltage adjustment circuit 18 Resistance 19 Switch element 20 Vehicle 21 Body 22 Vehicle storage battery 23 Vehicle start switch 24 Signal generator 25 Discharge circuit 26 Vehicle load 27 Voltage maintenance circuit

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PCT/JP2020/020069 2019-05-31 2020-05-21 蓄電システム Ceased WO2020241439A1 (ja)

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JP2010032261A (ja) * 2008-07-25 2010-02-12 Panasonic Corp 不均衡判定回路、電源装置、及び不均衡判定方法
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JP2009071936A (ja) * 2007-09-11 2009-04-02 Fuji Heavy Ind Ltd 組電池の電圧均等化システム
WO2014122869A1 (ja) * 2013-02-08 2014-08-14 住友建機株式会社 ショベル及びショベルの制御方法
JP2015080334A (ja) * 2013-10-16 2015-04-23 トヨタ自動車株式会社 蓄電システム

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