WO2012169171A1 - Système d'alimentation en énergie pour véhicule - Google Patents

Système d'alimentation en énergie pour véhicule Download PDF

Info

Publication number
WO2012169171A1
WO2012169171A1 PCT/JP2012/003658 JP2012003658W WO2012169171A1 WO 2012169171 A1 WO2012169171 A1 WO 2012169171A1 JP 2012003658 W JP2012003658 W JP 2012003658W WO 2012169171 A1 WO2012169171 A1 WO 2012169171A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
power supply
diodes
storage battery
unit
Prior art date
Application number
PCT/JP2012/003658
Other languages
English (en)
Japanese (ja)
Inventor
森本　直久
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2012169171A1 publication Critical patent/WO2012169171A1/fr

Links

Images

Classifications

    • 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
    • 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
    • B60L58/20—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 different nominal voltages
    • 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
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • 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
    • 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
    • B60L2240/549—Current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a vehicle power supply system using a storage battery mounted on a vehicle.
  • An electric vehicle Electric Vehicle
  • HEV Hybrid Electric Vehicle
  • a traction battery which is a high voltage storage battery for driving a motor for traveling.
  • vehicle-mounted devices other than a traveling motor such as an electronic control unit (ECU), a power window, an air conditioner, a lighting, and an audio device are called auxiliary devices.
  • ECU electronice control unit
  • auxiliary devices These accessories operate at low voltage. Therefore, a DC-DC converter is provided which steps down the output voltage of the traction battery and converts it to the operation power supply voltage of the accessory.
  • an automobile powered by an internal combustion engine includes an alternator that generates electric power by driving the internal combustion engine. And the power supply voltage for operation is supplied to the auxiliary equipment by the generated power of the alternator.
  • a lead storage battery is connected to a power supply line for auxiliary equipment. And the lead storage battery is always charged by the voltage of the power supply line. And when power supply from a traction battery or an alternator runs short, electric power is supplied to an auxiliary machine from a lead storage battery via a power supply line. As described above, when the power supplied from the traction battery or the alternator runs short, a storage battery that supplies power to the auxiliary device is referred to as an auxiliary battery.
  • the lead storage battery has a characteristic that the change of the output voltage with respect to the state of charge (SOC: State Of Charge) is small and the output voltage is flat. Therefore, conventionally, it has been possible to connect a DC-DC converter or an alternator directly to a lead storage battery to perform constant voltage charging.
  • SOC State Of Charge
  • the lithium ion battery may be overcharged and deteriorated.
  • a charger DC-DC converter that controls the charging current of the lithium ion battery based on the voltage of the power supply line output from the power supply unit such as a traction battery or alternator (For example, Patent Document 1).
  • the power supply unit such as the DC-DC converter or the alternator breaks down and the power supply voltage decreases. Even in such a case, the current from the lithium ion battery to the power supply line is interrupted by the charger. Therefore, when such a voltage drop is detected, it is necessary to control the operation of the charger to supply current from the lithium ion battery to the power supply line.
  • An object of the present invention is to provide a power supply system for a vehicle in which it is easy to shorten the time until the supply of voltage from the storage battery to the power supply line is started when the supply voltage from the power supply unit to the power supply line decreases. It is.
  • a vehicle power supply system is configured using a power supply unit that supplies a power supply voltage of a preset setting voltage to a power supply line, and a lithium ion battery, and has a full charge voltage higher than the preset voltage.
  • a storage battery a charging unit for charging the storage battery based on a power supply voltage output from the power supply unit, and a plurality of diodes connected in series, the plurality of diodes being directed from the storage battery to the power supply line Connected between the storage battery and the power supply line so as to be in a forward direction, the total of the on-state voltages of the respective diodes is equal to or greater than the difference between the set voltage and the full charge voltage of the storage battery The difference between the lower limit value of the target voltage range preset as the voltage to be supplied to the line and the full charge voltage is not satisfied.
  • FIG. 1 is a circuit diagram showing an example of a power supply system for a vehicle according to a first embodiment of the present invention.
  • the vehicle power supply system 1 shown in FIG. 1 includes a power supply unit 2, a storage battery 3, a charger 4 (charging unit), an ECU 5, a current detection unit 7, a voltage detection unit 8, diodes D1 to D6, a switching element SW1, and an operation switch. It has SW0.
  • the power supply system 1 for vehicles is mounted in vehicles, such as EV and HEV. Then, the vehicle power supply system 1 supplies power to the traveling drive motor in the vehicle and the accessory.
  • the accessory includes a vehicle ECU 10 that controls the vehicle and an ECU 5.
  • the power supply unit 2 includes a DC / DC converter 21 and a battery pack 22.
  • produces by the drive of an internal combustion engine is used as the power supply part 2, for example.
  • the battery pack 22 includes a traction battery TB and contactors CT1 to CT4.
  • the traction battery TB is an assembled battery configured by combining, for example, a plurality of lithium ion batteries, nickel hydrogen secondary batteries, and the like.
  • the traction battery TB is configured to output, for example, 350V.
  • the positive electrode (+) of the traction battery TB is connected to the DC / DC converter 21 via the contactor CT1.
  • the negative electrode (-) of the traction battery TB is connected to the DC / DC converter 21 via the contactor CT2.
  • the positive electrode (+) of the traction battery TB is connected to an unillustrated inverter via a contactor CT3
  • the negative electrode (-) of the traction battery TB is connected to an unillustrated inverter via a contactor CT4.
  • the inverter drives a power motor for traveling the vehicle based on the power supplied from the traction battery TB.
  • the contactors CT1 to CT4 are opened and closed in response to a control signal from the vehicle ECU 10.
  • the contactors CT1 to CT4 are off (open).
  • the contactors CT1 to CT4 are turned off (opened), thereby cutting off the supply of the power supply voltage from the traction battery TB to the DC / DC converter 21 or the inverter. Leakage current is prevented when the vehicle is at rest (off).
  • the output voltage of the traction battery TB is a high voltage
  • the contactors CT1 to CT4 are turned on (closed) by the vehicle ECU 10.
  • the power supply voltage is supplied from the traction battery TB to the DC / DC converter 21 and the inverter.
  • the DC / DC converter 21 steps down the output voltage of the traction battery TB to a power supply voltage at which the accessory can operate. Then, the DC / DC converter 21 supplies the stepped down voltage to the accessory via the power supply line PL.
  • the voltage applied to the power supply line PL is referred to as a voltage (+ BAT).
  • auxiliary devices such as the vehicle ECU 10 and the ECU 5 are operable at a power supply voltage in the range of 8V to 16V. Therefore, in the vehicle power supply system 1, a target voltage range which is a voltage to be supplied to the power supply line PL is set to, for example, 8V to 16V.
  • a voltage within a target voltage range is preset as a set voltage Vs.
  • the set voltage Vs is set to 12 V, for example.
  • the DC / DC converter 21 outputs the set voltage Vs, that is, 12 V to the power supply line PL.
  • the storage battery 3 is configured, for example, by connecting four lithium ion batteries in series.
  • the discharge termination voltage of a one-cell lithium ion battery is about 2.75V.
  • the full charge voltage of the lithium ion battery of one cell is about 4V.
  • the discharge termination voltage of the entire storage battery 3 is from 2.75 V ⁇ 4 to about 11 V, and the full charge voltage of the entire storage battery 3 is from 4 V ⁇ 4 to about 16 V.
  • the output voltage range in which storage battery 3 can be used is about 11V to about 16V.
  • Charger 4 generates a charge current for charging storage battery 3 from the voltage (+ BAT) of power supply line PL.
  • the charger 4 is, for example, a step-up / step-down DC / DC converter capable of performing boosting and bucking.
  • the ECU 5 boosts the voltage (+ BAT) by the charger 4 to set the charging current of the preset current value to the charger 4 To the storage battery 3.
  • the ECU 5 steps down the voltage (+ BAT) by the charger 4 to charge the charging current of the preset current value Ic. Supply the battery 4 to the storage battery 3.
  • the charger 4 is configured to charge the storage battery 3 at a constant current.
  • the charger 4 includes, for example, a field effect transistor (FET) 41, a diode 42, an insulating transformer 43, and a diode 44.
  • the power supply line PL is connected to one end of the primary coil of the transformer 43.
  • the other end of the primary coil of the transformer 43 is connected to the circuit ground via the FET 41.
  • a diode (parasitic diode) 42 is connected between both ends of the FET 41.
  • One end of the secondary coil of the transformer 43 is connected to the circuit ground.
  • the other end of the secondary coil of the transformer 43 is connected to the anode of the diode 44.
  • the anode of the diode 44 is connected to the positive electrode of the storage battery 3 via the current detection unit 7.
  • the current detection unit 7 is configured of, for example, a current sensor such as a shunt resistor or a Hall element.
  • the current detection unit 7 detects the charge / discharge current value of the storage battery 3 and outputs a signal indicating the detected current value to the ECU 5.
  • the current detection unit 7 indicates the charging current flowing in the direction of charging the storage battery 3 by a positive current value, and indicates the discharging current flowing in the direction of discharging the storage battery 3 by a negative current value.
  • the diodes D1 to D6 are connected in series so that the direction from the storage battery 3 toward the power supply line PL is forward.
  • the cathode of the diode D1 is connected to the power supply line PL, and the anode of the diode D6 is connected to the positive electrode of the storage battery 3 via the current detection unit 7.
  • One on-state voltage of the diodes D1 to D6 is, for example, 0.7V.
  • the total of the on voltages of the diodes D1 to D6 is 4.2V.
  • the set voltage Vs is 12 V and the full charge voltage of the storage battery 3 is about 16 V
  • the sum of the on voltages of the diodes D1 to D6 exceeds the difference between the set voltage Vs and the full charge voltage of the storage battery 3 Become.
  • the lower limit value of the target voltage range is 8V. Therefore, the total of the on-state voltages of the diodes D1 to D6 is a voltage less than 8 V which is the difference between the lower limit value of the target voltage range and the full charge voltage of the storage battery 3. That is, when the potential difference between the voltage (+ BAT) of the power supply line PL and the output voltage of the storage battery 3 becomes 4.2 V or more, the diodes D1 to D6 turn on.
  • DC / DC converter 21 breaks down and power supply unit 2 can not supply power supply voltage to power supply line PL. If the voltage (+ BAT) falls below the lower limit value of the target voltage range, that is, before the auxiliaries stop operating, diodes D1 to D6 are turned on and the output voltage of storage battery 3 is applied to power supply line PL. .
  • a control circuit such as the ECU 5 is used to detect an abnormality, and a charger performs control to reverse current.
  • the supply voltage from the power supply unit 2 to the power supply line PL decreases, it is possible to shorten the time until the voltage supply from the storage battery 3 to the power supply line PL is started.
  • connection point P1 between the diode D1 and the diode D2 is connected to the positive electrode of the storage battery 3 via the switching element SW1 and the current detection unit 7.
  • the switching element SW1 for example, a transistor such as a FET or a switching element such as a relay switch is used.
  • the switching element SW1 is turned on (closed) and turned off (opened) in accordance with a control signal from the ECU 5.
  • the switching element SW1 may be provided so as to short the remaining diodes except one of the diodes D1 to D6.
  • the switching element SW1 is provided between the cathode of the diode D1 and the anode of the diode D5. May be
  • the voltage detection unit 8 is configured using, for example, an analog-to-digital converter or the like.
  • the voltage detection unit 8 detects a voltage (+ BAT) and outputs a signal indicating the voltage (+ BAT) to the ECU 5.
  • the ECU 5 is, for example, a CPU (Central Processing Unit), a ROM (Read) Only memory, RAM (Random Access Memory), timer circuit, and peripheral circuits thereof are used. Then, the ECU 5 functions as the determination unit 51 and the control unit 52 by executing, for example, a control program stored in the ROM.
  • a CPU Central Processing Unit
  • ROM Read Only memory
  • RAM Random Access Memory
  • the ECU 5 is provided with power supply terminals 53 and 54.
  • the power supply terminal 53 is connected to the power supply line PL. Therefore, the voltage (+ BAT) is supplied to the power supply terminal 53.
  • the power supply terminal 54 is connected to one end of the operation switch SW0, and the other end of the operation switch SW0 is connected to the positive electrode of the storage battery 3 via the current detection unit 7. Therefore, when the operation switch SW0 is turned on, the output voltage Vout is supplied from the storage battery 3 to the power supply terminal 54 through the current detection unit 7 and the operation switch SW0.
  • the operation switch SW0 is, for example, a push button switch that can be operated by the user.
  • the ECU 5 that is, the determination unit 51 and the control unit 52 operate with the power supply voltage received by one of the power supply terminals 53 and 54.
  • the control unit 52 monitors the current value detected by the current detection unit 7. Then, the control unit 52 controls the on / off of the FET 41 so that the current value detected by the current detection unit 7 becomes the set current value Ic. Thereby, the control unit 52 causes the charger 4 to perform constant current charging of the storage battery 3. Further, when it is detected that the terminal voltage of the storage battery 3 has become a full charge voltage, for example, by the voltage detection circuit (not shown), the control unit 52 stops the constant current charging by the charger 4.
  • determination unit 51 determines that the current value detected by current detection unit 7 is a negative value, that is, storage battery 3 is in a discharged state, power supply to power supply line PL by power supply unit 2 is insufficient. It is determined that
  • the determination unit 51 monitors the voltage (+ BAT) detected by the voltage detection unit 8, and when the voltage (+ BAT) falls below a preset threshold voltage Vth, the power supply to the power supply line PL by the power supply unit 2 is performed. It may be determined that the supply is insufficient.
  • the threshold voltage Vth is a voltage lower than the set voltage Vs, for example, 8 V which is the lower limit value of the target voltage range.
  • the determination unit 51 is satisfied. It may be determined that the power supply to the power supply line PL by the power supply unit 2 is insufficient. In this case, the determination accuracy of the power supply shortage to the power supply line PL due to the failure or the like of the power supply unit 2 is improved.
  • the control unit 52 turns on the switching element SW1.
  • forward voltage drop in diode D1 to D6 is approximately equal to the total on voltage, ie, a voltage of about 4.2 V There is a descent. As a result, a power loss corresponding to the product of the voltage drop across the diodes D1 to D6 and the current flow occurs.
  • control unit 52 causes the diodes D2 to D6 to bypass the output current of the storage battery 3 by turning on the switching element SW1.
  • the power loss is a product of the voltage drop of about 0.7 V and the current generated in the diode D1, the power loss generated by the diodes D1 to D6 can be reduced.
  • the forward voltage generated in the diodes D1 to D6 increases as the current flowing through the diodes increases, and thus does not necessarily coincide with the sum of the on voltages of the respective diodes. However, in the following description, it is assumed that the sum of the forward voltage generated at the diodes D1 to D6 and the on voltage of each diode is approximately equal.
  • the diodes D1 to D6 turn on when the voltage (+ BAT) decreases to 6.8 V.
  • the ECU 5 starts operation.
  • the determination unit 51 determines that the power supply by the power supply unit 2 is insufficient, and the control unit 52 turns on the switching element SW1.
  • FIG. 2 is a timing chart showing an example of the operation of the vehicular power supply system 1 shown in FIG.
  • the vertical axis shows voltage
  • the horizontal axis shows the passage of time.
  • the solid line indicates the voltage (+ BAT)
  • the alternate long and short dash line indicates the output voltage Vout of the storage battery 3.
  • the storage battery 3 is fully charged, and the output voltage Vout is 16V.
  • the power supply unit 2 operates normally, and the voltage (+ BAT) is 12 V by the output voltage from the power supply unit 2.
  • the difference between the output voltage Vout and the voltage (+ BAT) is 4 V, which is less than 4.2 V which is the total of the on-voltages of the diodes D1 to D6. Therefore, the diodes D1 to D6 are off, and the storage battery 3 is not discharged.
  • timing T2 when the voltage output from the power supply unit 2 disappears, for example, because the DC / DC converter 21 breaks down, the voltage (+ BAT) drops sharply. Then, the difference between the output voltage Vout and the voltage (+ BAT) exceeds 4.2 V, and the diodes D1 to D6 are turned on (timing T2).
  • the current value detected by the current detection unit 7 becomes a negative value, which indicates that the storage battery 3 is discharged. Then, the determination unit 51 determines that the power supply by the power supply unit 2 is insufficient, and the control unit 52 turns on the switching element SW1 (timing T3).
  • Vehicle power supply system 1a shown in FIG. 3 differs from vehicle power supply system 1 shown in FIG. 1 in that DC / DC converter 21a outputs 10 V to power supply line PL as set voltage Vs. Further, in the power supply system 1a for a vehicle, nine diodes D1 to D9 are connected in series, and the total on voltage of the diodes D1 to D9 is 6.3 V. Different from system 1
  • Vehicle power supply system 1a is different from vehicle power supply system 1 in that charger 6 is used instead of charger 4 which is a buck-boost converter.
  • the charger 6 is a step-up DC / DC converter that generates a charging current for charging the storage battery 3 by boosting a voltage (+ BAT).
  • the charger 6 includes a coil 61, an FET 62, and diodes 63 and 64.
  • One end of the coil 61 is connected to the power supply line PL, and the other end is connected to the anode of the diode 64.
  • the cathode of the diode 64 is connected to the positive electrode of the storage battery 3 via the current detection unit 7.
  • the anode of the diode 64 is connected to the circuit ground via the FET 62.
  • a diode (parasitic diode) 63 is connected between both ends of the FET 62.
  • the set voltage Vs that is, the voltage (+ BAT) is lower than the discharge termination voltage of the storage battery 3 as long as the power supply unit 2a operates normally. Therefore, the charger 6 does not need to step down the voltage (+ BAT). As a result, a step-up type DC / DC converter that can be realized with a simpler configuration than the charger 4 and therefore cost less than the charger 4 can be used as the charger 6.
  • the set voltage Vs may be a voltage within the power supply voltage range in which the accessory can operate, that is, a voltage within the target voltage range, and is not limited to 12 V and 10 V.
  • FIG. 4 is a circuit diagram showing an example of the configuration of a vehicular power supply system 1b according to a second embodiment of the present invention.
  • the vehicle power supply system 1b shown in FIG. 4 differs from the vehicle power supply system 1 shown in FIG. 1 in the following points.
  • the vehicle power supply system 1b includes switching elements SW2 to SW5 in addition to the switching element SW1.
  • the connection point P2 between the diode D2 and the diode D3 is connected to the positive electrode of the storage battery 3 via the switching element SW2 and the current detection unit 7, and the connection point P3 between the diode D3 and the diode D4 is current detection from the switching element SW3
  • the junction point P4 of the diode D4 and the diode D5 is connected to the positive pole of the storage battery 3 via the switching element SW4 and the current detection unit 7, and the diode D5 and the diode D6 are connected.
  • the connection point P5 between the two is connected to the positive electrode of the storage battery 3 via the switching element SW5 and the current detection unit 7.
  • switching elements SW1 to SW5 for example, transistors such as FETs and switching elements such as relay switches are used.
  • the switching elements SW1 to SW5 are turned on (closed) and off (opened) in accordance with the control signal from the ECU 5, respectively.
  • the switching elements SW1 to SW5 correspond to an example of a short circuit part.
  • the ECU 5 b does not include the determination unit 51. Further, the ECU 5 b includes a control unit 52 b instead of the control unit 52.
  • control unit 52b sequentially selects voltage (+ BAT) from switching element SW5 corresponding to connection point P5 positioned closest to storage battery 3.
  • the switching elements SW5 to SW1 are sequentially turned on until the voltage V.sub.s becomes equal to or higher than the set voltage V.sub.s.
  • the control unit 52b When the voltage (+ BAT) falls below the threshold voltage Vth, the control unit 52b turns on the switching elements SW5 to SW1 one by one to thereby reduce the number of diodes shorted, that is, the number of diodes whose current is bypassed. Should be increased sequentially. Therefore, the order in which the control unit 52b turns on the switching elements SW5 to SW1 is not limited to a specific order.
  • control unit 52b sets a time from turning on one switching element to turning on the next switching element to be equal to or longer than a preset setting time ts. .
  • the set time ts becomes longer, the rising speed of the voltage (+ BAT) by sequentially turning on the switching elements SW5 to SW1 becomes slower. On the other hand, if the voltage (+ BAT) rises rapidly, the accessory may malfunction. Therefore, a value of the set time ts that allows stable operation of the auxiliary machine without malfunctioning is obtained, for example, experimentally, and set in advance as the set time ts.
  • the other configuration is the same as that of the power supply system 1 for a vehicle shown in FIG.
  • FIG. 5 is a timing chart showing an example of the operation of the vehicular power supply system 1b shown in FIG.
  • the vertical axis shows voltage, and the horizontal axis shows the passage of time.
  • the solid line indicates the voltage (+ BAT), and the alternate long and short dash line indicates the output voltage Vout of the storage battery 3.
  • the output voltage Vout of the storage battery 3 is 15V.
  • the power supply unit 2 operates normally, and the voltage (+ BAT) is 12 V by the output voltage from the power supply unit 2.
  • the difference between the output voltage Vout and the voltage (+ BAT) is 3 V, which is less than 4.2 V which is the total of the on-voltages of the diodes D1 to D6. Therefore, the diodes D1 to D6 are off.
  • timing T2 when the voltage output from the power supply unit 2 disappears, for example, because the DC / DC converter 21 breaks down, the voltage (+ BAT) drops sharply. Then, the difference between the output voltage Vout and the voltage (+ BAT) exceeds 4.2 V, and the diodes D1 to D6 are turned on (timing T2).
  • the control unit 52b maintains the state in which the switching element SW4 is turned on without turning on the subsequent switching elements SW3, SW2, and SW1. Then, the voltage (+ BAT) is maintained at 12.2V.
  • the accessory can operate in the power supply voltage range of 8 V to 16 V, for example, the operation of the accessory is generally performed when the voltage (+ BAT) of the set voltage Vs is normally output from the power supply unit 2 Most stable.
  • Vehicle power supply system 1c shown in FIG. 6 differs from vehicle power supply system 1b shown in FIG. 4 in that DC / DC converter 21a outputs 10 V to power supply line PL as set voltage Vs. Further, in the power supply system 1c for a vehicle, nine diodes D1 to D9 are connected in series, and the total on voltage of the diodes D1 to D9 is 6.3 V. Thus, the power supply for a vehicle shown in FIG. Different from system 1b.
  • Vehicle power supply system 1c is different from vehicle power supply system 1b in that charger 6 is used instead of charger 4 which is a buck-boost converter.
  • the set voltage Vs that is, the voltage (+ BAT) is lower than the discharge termination voltage of the storage battery 3 as long as the power supply unit 2a operates normally. Therefore, the charger 6 does not need to step down the voltage (+ BAT). As a result, as the charger 6, it is possible to use a step-up DC / DC converter that can be realized with a simpler configuration than the charger 4 and therefore cost less than the charger 4.
  • the vehicle power supply system is configured using a power supply unit that supplies a power supply voltage of a preset setting voltage to the power supply line, and a lithium ion battery, and a full charge voltage higher than the preset voltage.
  • a charging unit for charging the storage battery based on the power supply voltage output from the power supply unit, and a plurality of diodes connected in series, the plurality of diodes being directed from the storage battery to the power supply line Connected between the storage battery and the power supply line such that the direction is forward, the total of the on-state voltages of the respective diodes is equal to or greater than the difference between the set voltage and the full charge voltage of the storage battery; The difference between the lower limit value of the target voltage range preset as the voltage to be supplied to the power supply line and the full charge voltage is not satisfied.
  • the power supply unit when the power supply unit is operating normally, supplies the power supply voltage of the preset voltage set to the power supply line. Further, a plurality of diodes are connected in series between the storage battery and the power supply line. The sum of the on-state voltages of the respective diodes is equal to or greater than the set voltage, ie, the difference between the voltage of the power supply line and the full charge voltage of the storage battery. Therefore, even if the charging unit fully charges the storage battery, the plurality of diodes remain off. As a result, the charging current from the charging unit is prevented from flowing out to the power supply line through the plurality of diodes, and the power loss due to the outflow of the charging current is prevented.
  • the total of the on-state voltages of the respective diodes does not satisfy the difference between the lower limit value of the target voltage range preset as the voltage to be supplied to the power supply line and the full charge voltage of the storage battery. Therefore, when the power supply unit does not operate normally and the power supply voltage drops, a plurality of diodes are turned on before the voltage of the power supply line falls below the lower limit of the target voltage range, and a voltage is supplied from the storage battery to the power supply line . In this case, the control time for the operation control of the charger, which is required in the background art, is not necessary to start discharging the storage battery. Therefore, when the supply voltage from the power supply unit to the power supply line is reduced, it is easy to shorten the time until the voltage supply from the storage battery to the power supply line is started.
  • a switching element that shorts the remaining diodes except one of the plurality of diodes, a determination unit that determines presence or absence of a shortage in supply of the power supply voltage by the power supply unit, and a shortage of the supply by the determination unit It is preferable to include a control unit that turns on the switching element when it is determined that there is a.
  • the determination unit determines that the supply of the power supply voltage is insufficient.
  • the voltage of the power supply line is lowered to turn on the plurality of diodes, and a current is supplied from the storage battery to the power supply line.
  • a forward voltage drop occurs and a power loss occurs.
  • the control unit turns on the switching element when the determination unit determines that the supply of the power supply voltage is insufficient.
  • the discharge current of the storage battery bypasses the other diode leaving one diode. This reduces the voltage drop across the diode and reduces power dissipation.
  • the switching element is turned on, one diode remains between the storage battery and the power supply line, so that backflow from the power supply line to the storage battery is prevented.
  • a current detection unit for detecting the charge and discharge current of the storage battery is further provided, and the determination unit has the shortage of the supply when the charge and discharge current detected by the current detection unit is a current in the discharge direction. It is preferable to determine
  • the determination unit can determine that there is a shortage of power supply.
  • the voltage detection unit further includes a voltage detection unit that detects the voltage of the power supply line, and the determination unit determines that the voltage detected by the voltage detection unit falls below a threshold voltage preset to a voltage that does not meet the set voltage. In this case, it may be determined that there is a shortage of the supply.
  • the determination unit can determine that there is a shortage of power supply.
  • the number of the diodes is three or more, and a voltage detection unit for detecting the voltage of the power supply line and any one of the plurality of diodes can be short-circuited and the number of diodes short-circuited can be changed.
  • the voltage detector detects the number of diodes short-circuited by the short circuit and the number of diodes shorted by the short circuit when the voltage detected by the voltage detector falls below a threshold voltage preset to a voltage less than the set voltage. It is preferable to include a control unit that sequentially increases the detected voltage until it reaches the set voltage or more.
  • the control unit sequentially increases the number of diodes short-circuited by the short circuit. Then, as the number of shorted diodes increases, the number of diodes to which the discharge current bypasses increases and the voltage drop decreases.
  • the voltage detected by the voltage detection unit that is, the voltage of the power supply line rises.
  • the control unit sequentially increases the number of diodes shorted by the shorting unit until the voltage of the power supply line becomes equal to or higher than the set voltage, and increases the number of diodes shorted further when the voltage of the power supply line becomes equal to or higher than the set voltage. I will not let you. Therefore, the voltage of the power supply line is maintained at a voltage slightly higher than the set voltage. As a result, even when the power supply is insufficient due to a failure of the power supply unit or the like, the voltage of the power supply line can be maintained at a voltage close to the set voltage.
  • control unit may set a time from the short-circuiting of one diode to the short-circuiting of the next diode not less than a preset setting time. It is preferable to do.
  • the control unit When the control unit shorts the plurality of diodes sequentially, the voltage of the power supply line rises. However, the load receiving the supply of the power supply voltage from the power supply line is likely to become unstable in operation if the power supply voltage rises rapidly. Therefore, when sequentially short-circuiting a plurality of diodes, the control unit allows a time longer than a preset setting time to short-circuit one diode and then short-circuit the next diode. Slowly raise the line voltage. As a result, the stability of the operation of the load receiving the supply of the power supply voltage from the power supply line is improved.
  • the control unit may further operate using the power supply voltage as a power supply voltage for operation, and the operation switch may output an output voltage of the storage battery when the operation switch is operated. It is preferable to supply as an operation power supply voltage of the control unit.
  • the control unit does not operate with the voltage of the power supply line due to the voltage drop due to the diode. Also, the user can activate the control unit by operating the operation switch.
  • the set voltage is 12 V
  • the charging unit is a buck-boost converter capable of stepping up and down the power supply voltage.
  • the set voltage may be a voltage lower than a discharge termination voltage preset as a voltage to stop the discharge of the storage battery, and the charging unit may be a boost converter capable of boosting the power supply voltage.
  • the power supply voltage of the power supply line does not become higher than the output voltage of the storage battery. Therefore, since the charging unit does not need to step down the power supply voltage, the charging unit can be configured by a boost converter. Then, the cost can be reduced as compared to the case where the charging unit is configured by a buck-boost converter.
  • the power supply system for vehicles which concerns on this invention is useful as a power supply system for vehicles using the storage battery mounted in a vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Battery Mounting, Suspending (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne un système d'alimentation en énergie pour véhicule qui comprend les éléments suivants : une unité d'alimentation en énergie qui fournit une tension d'alimentation en énergie prédéterminée à une ligne d'alimentation en énergie ; une batterie rechargeable qui comprend une batterie au lithium-ion et qui a une tension à l'état entièrement chargé plus élevée que la tension d'alimentation en énergie précitée ; une unité de chargement qui utilise la tension d'alimentation en énergie fournie par l'unité d'alimentation en énergie pour charger la batterie rechargeable ; et une pluralité de diodes connectées en série. Lesdites diodes sont connectées entre la batterie rechargeable et la ligne d'alimentation en énergie précitée de telle manière que le sens conducteur desdites diodes soit dirigé de la batterie rechargeable vers la ligne d'alimentation en énergie. La chute de tension totale dans le sens conducteur des diodes est supérieure ou égale à la différence entre la tension d'alimentation en énergie et la tension d'état entièrement chargé de la batterie rechargeable mais inférieure à la différence entre la limite inférieure de la plage de tensions cible prédéterminée, la plage de tensions indiquant la tension qui devrait être fournie à la ligne d'alimentation en énergie et la tension à l'état entièrement chargé de la batterie rechargeable.
PCT/JP2012/003658 2011-06-06 2012-06-04 Système d'alimentation en énergie pour véhicule WO2012169171A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-126362 2011-06-06
JP2011126362A JP2014150593A (ja) 2011-06-06 2011-06-06 車両用電源システム

Publications (1)

Publication Number Publication Date
WO2012169171A1 true WO2012169171A1 (fr) 2012-12-13

Family

ID=47295756

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/003658 WO2012169171A1 (fr) 2011-06-06 2012-06-04 Système d'alimentation en énergie pour véhicule

Country Status (2)

Country Link
JP (1) JP2014150593A (fr)
WO (1) WO2012169171A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017143682A (ja) * 2016-02-12 2017-08-17 株式会社日本製鋼所 産業機械の制御用電源のバックアップ蓄電池
WO2018135668A1 (fr) * 2017-01-23 2018-07-26 ヤマハ発動機株式会社 Bloc-batterie au lithium-ion
EP3275720A4 (fr) * 2015-03-27 2018-10-31 Kabushiki Kaisha Toshiba Dispositif d'alimentation électrique auxiliaire

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9927998B2 (en) 2014-02-05 2018-03-27 Tidal Systems, Inc. Flash memory compression
KR101779942B1 (ko) 2015-02-24 2017-10-10 주식회사 엘지화학 하이브리드 차량의 통합 전원 공급 장치
JP6458712B2 (ja) * 2015-11-13 2019-01-30 トヨタ自動車株式会社 車両用電源システム
JP2017118788A (ja) * 2015-12-25 2017-06-29 カルソニックカンセイ株式会社 蓄電池システム
JP6704895B2 (ja) 2017-12-20 2020-06-03 株式会社Ｓｕｂａｒｕ 電動車両の電源システム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03293939A (ja) * 1990-04-06 1991-12-25 Nippon Telegr & Teleph Corp <Ntt> 直流電源システム
JPH04265641A (ja) * 1991-02-19 1992-09-21 Nippon Telegr & Teleph Corp <Ntt> 直流無停電電力給電装置
JP2011109745A (ja) * 2009-11-13 2011-06-02 Panasonic Corp 蓄電装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03293939A (ja) * 1990-04-06 1991-12-25 Nippon Telegr & Teleph Corp <Ntt> 直流電源システム
JPH04265641A (ja) * 1991-02-19 1992-09-21 Nippon Telegr & Teleph Corp <Ntt> 直流無停電電力給電装置
JP2011109745A (ja) * 2009-11-13 2011-06-02 Panasonic Corp 蓄電装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3275720A4 (fr) * 2015-03-27 2018-10-31 Kabushiki Kaisha Toshiba Dispositif d'alimentation électrique auxiliaire
JP2017143682A (ja) * 2016-02-12 2017-08-17 株式会社日本製鋼所 産業機械の制御用電源のバックアップ蓄電池
WO2018135668A1 (fr) * 2017-01-23 2018-07-26 ヤマハ発動機株式会社 Bloc-batterie au lithium-ion

Also Published As

Publication number Publication date
JP2014150593A (ja) 2014-08-21

Similar Documents

Publication Publication Date Title
WO2012169171A1 (fr) Système d&#39;alimentation en énergie pour véhicule
JP5865013B2 (ja) 車両用の電源装置及びこの電源装置を備える車両
US10710469B2 (en) Automotive dual voltage battery charging system
CN102668229B (zh) 电池升温电路和电池升温装置
EP2272722B1 (fr) Appareil de source d&#39;alimentation pour véhicule
US7832513B2 (en) Vehicular electrical system and control method therefor
US8134338B2 (en) Battery management system and driving method thereof
US8487558B2 (en) Electric vehicle
US9843184B2 (en) Voltage conversion apparatus
EP2200146A1 (fr) Dispositif d&#39;alimentation electrique
US20090050092A1 (en) Engine Start Device
AU2016102104B4 (en) Apparatus for starting an electrically cranked engine
CN113711457A (zh) 转换装置、转换系统、切换装置、包括这些装置的车辆及控制方法
US10361572B2 (en) Power supply component and power supply method
US8890488B2 (en) Power supply apparatus and method of controlling the same
KR101795169B1 (ko) 배터리 점프 시동 방법
US20200395780A1 (en) Charge control apparatus, energy storage apparatus, and charging method
JP2004023803A (ja) 組電池の電圧制御装置
US7477040B2 (en) Circuit for a motor vehicle electrical distribution system and an associated operating method
JP2012035756A (ja) 車両用電源装置
JP2002281609A (ja) 複合２次電池回路および回生制御システム
JP6409635B2 (ja) 蓄電システム
JP6969200B2 (ja) 電源システム
JP2008253083A (ja) 移動車両用電源装置
CN112649748A (zh) 用于确定机动车辆的低压电池的荷电状态的方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12796081

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12796081

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP