WO2018101702A1 - Electric vehicle charging system capable of inter-vehicle charging - Google Patents

Electric vehicle charging system capable of inter-vehicle charging Download PDF

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Publication number
WO2018101702A1
WO2018101702A1 PCT/KR2017/013684 KR2017013684W WO2018101702A1 WO 2018101702 A1 WO2018101702 A1 WO 2018101702A1 KR 2017013684 W KR2017013684 W KR 2017013684W WO 2018101702 A1 WO2018101702 A1 WO 2018101702A1
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WO
WIPO (PCT)
Prior art keywords
charging
electric vehicle
battery
vehicle
cable
Prior art date
Application number
PCT/KR2017/013684
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French (fr)
Korean (ko)
Inventor
고홍기
Original Assignee
르노삼성자동차 주식회사
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Priority claimed from KR1020160159964A external-priority patent/KR20180060454A/en
Priority claimed from KR1020170114321A external-priority patent/KR102538406B1/en
Application filed by 르노삼성자동차 주식회사 filed Critical 르노삼성자동차 주식회사
Publication of WO2018101702A1 publication Critical patent/WO2018101702A1/en

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    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by 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 battery charging technology for electric vehicles, and more particularly, to research and improvement related to the standard of IEC 61851-23 (DC electric vehicle charging station).
  • Electric cars have a shorter mileage compared to internal combustion engine cars using fossil fuels due to the limited battery capacity. Despite the short mileage, charging stations for electric vehicles are far shorter than gas stations for internal combustion engine cars, so electric vehicle drivers are always anxious about battery discharge while driving.
  • the inventor of the present invention has been studying a method for charging the electric vehicle discharged while driving.
  • the present invention has been completed after a lot of efforts to complete a system for charging in a discharge situation using a general electric vehicle around the vehicle rather than a specially manufactured vehicle for charging.
  • An object of the present invention is to implement a charging system that can be used "universally" in a discharge situation while driving an electric vehicle.
  • An object of the present invention in a first aspect of the present invention is to provide a method for charging an electric vehicle by sending electric power of the electric vehicle to another electric vehicle through a portable electric vehicle charging cable.
  • An object of the present invention according to the second aspect of the present invention is to ensure versatility by using a battery and a charging terminal of a conventional electric vehicle as it is to supply power to another vehicle using a general electric vehicle.
  • Another object of the present invention is to shorten the waiting time in an emergency by supplying power to the electric vehicle discharged through the above charging system.
  • a pair of inlets connected to a charging terminal of an individual electric vehicle for charging a vehicle vs vehicle;
  • a portable electric vehicle charging cable formed between a pair of inlets and including a main body for controlling chassis charging:
  • a communication unit communicating with a battery control system (BMS) installed in an individual electric vehicle;
  • control unit for receiving a signal from the communication unit and controlling the converter.
  • the main body of the charging cable may further include a backflow prevention circuit connected to the converter to prevent backflow of current.
  • control unit of the charging cable according to an embodiment of the present invention
  • the controller may be configured to receive a charge request signal and a state of charge (SOC) from a battery control unit (BMS) of a powered electric vehicle.
  • SOC state of charge
  • BMS battery control unit
  • BMS battery control unit
  • BMS battery control unit
  • the portable electric vehicle charging cable may include charging and monitoring a state of charge (SOC) of a powered electric vehicle.
  • SOC state of charge
  • a second aspect of the invention relates to a charging system for a chassis electric vehicle:
  • a boosting unit boosting the voltage output from the battery to a predetermined potential
  • a charging terminal for connection with the outside during charging or discharging of the battery
  • the switch is controlled according to a charging mode or a discharging mode of a charging system, and the switch is controlled to connect the charging terminal and the battery when the charging system is in the charging mode, and the charging terminal when the charging system is in the discharge mode.
  • a control unit for controlling the switch to connect the boosting unit.
  • the charging terminal includes a recognizing unit that determines a coupling direction of a charging cable, and transmits the determination result of the recognizing unit to the control unit to provide the control unit.
  • the switch may be controlled according to the determination result.
  • the charging cable includes a recognition device indicating the coupling direction of the cable on one side ,
  • the recognition unit may determine the coupling direction of the cable according to the presence or absence of the recognition device.
  • the present invention has the effect of charging the electric vehicle in the face of an emergency by discharging the battery using the electric vehicle of another person. This is because it can be urgently powered from an ordinary electric vehicle instead of a dedicated charging system.
  • FIG. 1 shows a configuration example of an electric vehicle charging system according to the prior art.
  • FIG. 2 is a view showing FIG. 1 in more detail.
  • FIG 3 is a view conceptually illustrating the technical idea of the present invention.
  • Figure 4 shows a schematic configuration of a portable electric vehicle charging cable according to a preferred embodiment of the present invention.
  • FIG. 5 is a view showing a preferred embodiment of the reverse current prevention circuit of the present invention.
  • FIG. 6 schematically shows an entire process of an electric vehicle charging method according to a preferred embodiment of the present invention.
  • FIG. 7 shows an example of the configuration of a charging system according to a preferred embodiment of the second aspect of the present invention.
  • FIG. 8 is a view showing emergency charging between vehicles according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating charging between a vehicle and a charging station according to another embodiment of the present invention.
  • FIG. 10 shows an example of the configuration of a system that automatically recognizes the charge / discharge according to another embodiment of the present invention.
  • the charging station 1 shows a configuration example of an electric vehicle charging system according to the prior art. According to the prior art, the charging station 1 is required for charging the electric vehicle 2.
  • the charging station 1 of the prior art includes a control unit 1x, a boost converter 1y and a charging terminal 1z.
  • the charging station 1 converts AC or DC power supplied from a power grid or home power into DC power. If necessary, it is boosted to a predetermined output voltage and supplied to the electric vehicle 2.
  • IEC 61851-23 DC electric vehicle charging station
  • the charging station 1 converts the input power into DC when the input power is AC power through the step-up converter 1y, and converts the power into a predetermined voltage for charging the electric vehicle 2 to transmit power to the electric vehicle 2. do.
  • a voltage for charging a high voltage such as 400V or 500V is used.
  • the electric vehicle 2 exchanges control signals with the charging station 1 for charging.
  • various vehicle communication methods such as a controller area network (CAN), a multimedia oriented systems transport (MOST), and a local interconnect network (LIN) may be used.
  • CAN controller area network
  • MOST multimedia oriented systems transport
  • LIN local interconnect network
  • the electric vehicle 2 receives power from the charging station 1 through the charging terminal 2z and stores and uses the power in the internal battery 2y.
  • FIG. 2 shows in more detail the structure in which power and control signals are transmitted and received between the charging station 1 and the electric vehicle 2.
  • a of the charging station 1 represents an AC / DC transformer
  • "b” represents a fuse
  • "c” represents a data communication controller
  • “d” represents a connector lock control circuit.
  • "f” denotes a relay control circuit
  • "g” and "h” denote a recognition circuit.
  • the charging system of the present invention may use various standard techniques of the charging system between the charging station 1 and the electric vehicle 2 of FIGS. 1 and 2. However, the subject matter of the present invention will now be described in detail and in a variety of ways, not in the charging system between the charging station 1 and the electric vehicle 2, but in the inter-vehicle charging system.
  • Fig. 3 to 6 relate to a first aspect of the invention.
  • Fig. 3 conceptually illustrates the technical idea of the present invention.
  • the portable electric vehicle charging cable 100 is a charging cable for charging vehicle (Vehicle vs. Vehicle) and is portable size.
  • the charging cable 100 is composed of a pair of inlets 110 and the body 120.
  • One of the pair of inlets 110 is connected to a charging terminal of the electric vehicle 10 that supplies power.
  • the other inlet 110 is connected to a charging terminal of the electric vehicle 20 (meaning an emergency electric vehicle in which the battery is discharged) to be supplied with power.
  • the main body 120 is formed between the pair of inlets to control the vehicle charging.
  • a cable is connected between the inlet 110 and the main body 120.
  • the cable includes a power line and a communication line. Communication lines can send and receive signals in CAN communication.
  • the main body 120 includes a communication unit 121, a control unit 123, a reverse current prevention circuit 125, and a converter 127.
  • the communication unit 121 of the charging cable 100 communicates with the individual electric vehicles 10 and 20.
  • the communication unit 121 may communicate in a CAN communication method.
  • the control unit 123 of the charging cable 100 communicates with the battery control units BMS 11 and 21 installed in the individual electric vehicles 10 and 20 through the communication unit 121.
  • the controller 123 may collect various types of information regarding the state of charge (SOC) of the batteries 12 and 22.
  • the controller 123 may determine the electric vehicle 10 providing the power and the electric vehicle 20 requesting the charging to start charging.
  • the controller 123 switches the reverse current prevention circuit 125 according to the charging direction, and controls the converter 127 to adjust the boosted voltage for charging.
  • the reverse current prevention circuit 125 prevents the current from flowing backward as opposed to the charging direction.
  • the reverse current prevention circuit 125 may include a zener diode as a reverse current prevention diode.
  • the converter 127 boosts the voltage supplied. In order to charge the battery 22 of the electric vehicle, the voltage of the side to be charged must be higher than the voltage of the side to be charged.
  • the controller 123 may measure the battery voltage of the electric vehicle that supplies power and boost the voltage to 400V when the voltage is 400V or less.
  • the inlet of the present invention may have the same shape. Therefore, the user can use the inlet of the side to be charged and the side to be charged without distinguishing.
  • the controller receives a charge permission signal and a state of charge (SOC) from a battery controller BMS of the electric vehicle 10 that supplies power, and receives the electric vehicle 20 that is supplied with power.
  • a charge request signal and a state of charge (SOC) may be received from the battery controller BMS.
  • the reverse current prevention circuit 125 may further include a switching circuit capable of selecting a reverse current prevention diode according to the direction of the current.
  • the first switching element x is connected and the second switching element y is opened to operate the first backflow prevention diode 125a.
  • the second switching element 125b is operated by opening the first switching element x and connecting the second switching element y to each other.
  • the controller 123 of the charging cable 100 determines the direction of the current by combining the charge permission signal, the charge request signal, and the state of charge of the battery, and then controls the first switching element x and the second switching element y. .
  • Figure 6 schematically shows the process of the electric vehicle charging method between the chassis using the above charging system configuration.
  • a pair of inlets included in the portable electric vehicle charging cable are connected to charging terminals of two electric vehicles, respectively (S110).
  • the vehicle After connecting two electric cars, the vehicle runs the charging mode (S120).
  • the portable electric vehicle charging cable may first receive a charge permission signal from the battery control unit (BMS) of the electric vehicle that supplies power.
  • the charge permission signal is a signal that allows an electric vehicle to supply power from its battery.
  • the portable electric vehicle charging cable may receive a charge request signal from the battery control unit (BMS) of the electric vehicle is powered.
  • the charge request signal is a signal that the electric vehicle requests to charge.
  • a portable electric vehicle charging cable can measure the battery voltage of two electric vehicles.
  • the control unit of the charging cable main body compares the measured voltage and calculates the boosted amount.
  • the controller may boost the voltage to 400V when the voltage at the power supply side is less than 400V (S130).
  • the portable electric vehicle charging cable starts charging and monitors a state of charge (SOC) of a battery powered electric vehicle (S140).
  • SOC state of charge
  • S140 battery powered electric vehicle
  • the charging cable analyzes the monitoring result and outputs the battery's charge level, driving distance, and charging time.
  • FIG. 7 shows an example of a charging system 300 configured inside an electric vehicle of the present invention.
  • Charging system 300 of the electric vehicle according to the present invention for inter-vehicle charging is the control unit 310, the battery 320, the boosting unit 330, the switch 340, the charging terminal 350 and the diode 360 Can be configured.
  • the charging of other electric vehicles requires a high voltage of 400V to 500V. Also, when the battery voltage of the fully charged electric vehicle is lower than the battery voltage of the discharged electric vehicle, the charging operation may not be performed normally. Therefore, the booster 330 is used to increase the output voltage of the battery 320 to the required voltage.
  • the battery 320 of the charging system 300 should have both directions of charging and discharging, and for the sake of versatility, the charging terminal 350 is used for both charging and discharging.
  • Switch 340 switches this operation. That is, the switch 340 selectively connects the charging terminal 350 and the battery 320 under the control of the controller 310.
  • the switch 340 is controlled to directly connect the charging terminal 350 and the battery 320. At this time, external power is supplied to the battery 320 through the charging terminal 350 to perform charging.
  • the switch 340 is controlled to connect the charging terminal 350 and the boosting unit 330. At this time, the power of the battery 320 is boosted to the required voltage and supplied to the outside.
  • the charging terminal 350 is used to connect a charging cable (not shown), and is used to communicate with a power terminal for charging or discharging the battery 320 and a controller 310 and a charging system such as another electric vehicle or charging station. It includes a communication terminal.
  • the controller 310 determines a charging mode according to a user's operation or through communication with another charging system, and controls the switch 340 according to the charging mode.
  • the reverse current prevention diode 360 blocks the reverse current due to the switch 340 connection error of the charging system 300 as described above.
  • a malfunction occurs when a user selects a charging mode incorrectly, or a charging mode is selected differently from the connection of the charging system 300 due to a communication error. That is, when the switch 340 is connected to the booster in the charging mode or the switch 340 is connected to the battery in the discharge mode, the reverse current blocking dial 360 blocks the reverse current. Doing so can prevent charging or damage to the charging system 300.
  • the controller 310 When the charging system 300 of the first electric vehicle urgently supplies power to the charging system of the second electric vehicle 400, the controller 310 communicates with the charging system 400 of the electric vehicle that is powered. Determine the charging mode through. In this case, the controller 310 may transmit a control signal transmitted from a general electric vehicle charging station to a charging system 400 of another electric vehicle using a vehicle communication protocol such as CAN communication.
  • a vehicle communication protocol such as CAN communication.
  • the controller 310 of the first electric vehicle controls the switch 340.
  • the booster 330 and the charging terminal 350 are connected.
  • the switch is connected, the power passing through the boosting unit 330 from the battery 320 is supplied to the charging system 400 of the electric vehicle that needs to be charged through the charging terminal 350 and the cable.
  • the controller 310 determines the charging mode through communication with the charging station 500, and when the power supply mode is determined to be the power supply mode, the controller 310 controls the switch 340 to directly connect the charging terminal 350 and the battery 320. .
  • the battery 320 In the mode of receiving power, the battery 320 is charged in the same manner as a general electric vehicle charging method.
  • the charging system 300 of the electric vehicle according to the present invention is capable of bidirectional charging, it is inconvenient for a user to specify a charging or discharging mode.
  • the charging mode can be determined through communication with the charging station, but in the case of the inter-vehicle charging, it is impossible to determine which vehicle is the charging mode and which vehicle is the discharge mode. If the charging mode is set incorrectly, charging may fail or, in the worst case, damage the charging system.
  • the charging system 600 of the electric vehicle of FIG. 10 may further include a dedicated charging cable 660.
  • the charging cable 660 is divided into a discharge side terminal 662 and a charging side terminal 666, and the discharge side terminal 662 includes a recognition device 664 for determining a charging mode.
  • the charging side and the discharge side may be separately displayed on the charging cable 660 to recognize the user.
  • the recognition unit 652 included in the charging terminal 650 of the charging system 600 checks whether the recognition device 662 of the charging cable 660 is connected.
  • the recognition unit 652 of the charging cable 660 transmits whether the recognition device 662 is connected to the control unit 610 of the electric vehicle charging system 660, the control unit 610 is connected to the recognition device 662
  • the switch 640 is controlled according to whether or not.
  • the recognition unit 652 may directly control the switch 640 according to whether the recognition device 662 is connected.
  • the controller 610 may inform the user of the charging mode of the vehicle by using the display device of the vehicle, the user's smartphone, or a separate display device.
  • the charging side vehicle to which the charging side terminal 666, which does not include the recognition apparatus 662, is connected receives the recognition apparatus without the recognition apparatus, the charging side vehicle receives power from the other vehicle by controlling the internal switch of the charging system to the charging mode.
  • the charging or discharging mode is automatically set according to the connection direction of the cable, thereby preventing malfunction or damage caused by a user's mistake.
  • control method of the charging system may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs, DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, Hardware devices specifically configured to store and execute program instructions, such as flash memory, may be included.
  • Examples of program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The present invention relates to an electric vehicle charging system. A charging system according to any one preferred embodiment of the present invention comprises: a battery for performing both charging and discharging; a boost unit for boosting the output voltage of the battery to a preset voltage; a charging terminal for receiving power from the outside of the charging system or supplying power to the outside; a switch for directly connecting the battery and the charging terminal or connecting the boost unit and the charging terminal, according to a charging or discharging mode of the charging system; and a control unit for controlling the switch according to the charging or discharging mode of the charging system. In addition, when the charging system is in the charging mode, the control unit controls the switch such that the charging terminal and the battery are directly connected. In this case, the battery is charged by the power supplied from the outside. When the charging system is in the discharging mode, the switch is controlled such that an output of the battery is connected to the charging terminal through the boost unit. In this case, battery power is supplied to the outside.

Description

차량간 충전이 가능한 전기 자동차용 충전 시스템Charging System for Electric Vehicles
본 발명은 전기 자동차의 배터리 충전 기술에 관하며, 특히 IEC 61851-23 (DC electric vehicle charging station) 표준과 관련되는 연구와 개선에 관한 것이다.TECHNICAL FIELD The present invention relates to battery charging technology for electric vehicles, and more particularly, to research and improvement related to the standard of IEC 61851-23 (DC electric vehicle charging station).
전기 자동차가 친환경 교통수단으로 각광을 받으면서 최근 그와 관련된 연구들이 활발히 이루어지고 있다.As electric vehicles are spotlighted as eco-friendly means of transportation, recent researches have been actively conducted.
전기 자동차는 배터리 용량의 한계 때문에 화석연료를 사용하는 내연기관 자동차에 비해 주행거리가 짧은 단점이 있다. 이렇게 주행거리가 짧음에도 불구하고 전기 자동차를 위한 충전소는 내연기관 자동차를 위한 주유소에 비해 턱없이 부족한 것이 현실이어서 전기 자동차 운전자들은 항상 주행 중 배터리 방전에 대한 불안함을 가지고 있다.Electric cars have a shorter mileage compared to internal combustion engine cars using fossil fuels due to the limited battery capacity. Despite the short mileage, charging stations for electric vehicles are far shorter than gas stations for internal combustion engine cars, so electric vehicle drivers are always anxious about battery discharge while driving.
전기 자동차의 짧은 주행거리로 인한 문제들을 개선하기 위해 배터리의 용량 증가를 포함하여 주행거리를 늘리기 위한 연구들이 계속되고 있고 정부에서도 전기 자동차 충전소를 계속 늘려가고 있는 추세이다.In order to improve the problems caused by the short driving distance of the electric vehicle, research is being conducted to increase the mileage, including increasing the capacity of the battery, and the government continues to increase the number of electric vehicle charging stations.
하지만 여전히 전기 자동차의 주행 중 방전이 되는 상황에 대해서는 대책이 없다. 내연기관 자동차는 주행 중 연료가 고갈되더라도 보험사의 비상급유 서비스를 이용하거나 인근 주유소에서 소량의 연료를 구입하여 직접 자동차에 주입함으로써 가까운 주유소까지 주행이 가능하다. 반면 전기 자동차는 아직까지는 이렇게 간이한 방식으로 충전을 위한 전기를 공급하는 방법이 없기 때문에 가까운 충전소까지 견인을 하는 수밖에 없다.However, there is still no countermeasure against the situation where the electric vehicle is discharged while driving. Internal combustion engine cars can travel to nearby gas stations, even if they run out of fuel, by using an insurance company's emergency refueling service or by purchasing a small amount of fuel from nearby gas stations and injecting them directly into the car. On the other hand, electric vehicles have no way of supplying electricity for charging in this simple way, so they have to pull to the nearest charging station.
그러한 상황에 대처하기 위해 전기 자동차에 대한 긴급출동 및 충전 서비스가 알려져 있지만, 긴급충전용 차량을 별도로 제작해야 하는 문제가 있다. 또한 긴급충전을 위한 전용 차량이 도착할 때까지 현장에서 기다려야 하는 불편함도 있으며, 인근의 충전 전용 차량이 모두 출동 중이라면 대기 시간은 더욱 길어질 수밖에 없다.In order to cope with such a situation, emergency dispatch and charging services for electric vehicles are known, but there is a problem of separately manufacturing emergency charging vehicles. There is also the inconvenience of having to wait in the field until the arrival of a dedicated vehicle for emergency charging, and waiting time will be longer if all nearby charging-only vehicles are in operation.
본 발명의 발명자는 이렇게 주행 중 방전이 된 전기 자동차의 충전을 위한 방안을 연구해 왔다. 충전을 위한 특별히 제작된 차량이 아니라 주변의 일반 전기 자동차를 이용하여 방전 상황에서의 충전을 진행하는 시스템을 완성하기 위해서 많은 노력 끝에 본 발명을 완성하기에 이르렀다.The inventor of the present invention has been studying a method for charging the electric vehicle discharged while driving. The present invention has been completed after a lot of efforts to complete a system for charging in a discharge situation using a general electric vehicle around the vehicle rather than a specially manufactured vehicle for charging.
본 발명의 목적은 전기 자동차의 주행 중 방전 상황에서 "범용적으로" 사용이 가능한 충전 시스템을 구현함에 있다.An object of the present invention is to implement a charging system that can be used "universally" in a discharge situation while driving an electric vehicle.
본 발명의 발명자는 휴대용 전기 자동차 충전케이블을 이용하여 차대차(Vehicle vs. Vehicle) 충전을 가능하게 하기 위해 본 발명을 착안했다. 본 발명의 제1국면에서 본 발명의 목적은 휴대용 전기 자동차 충전케이블을 통해 전기 자동차의 전력을 다른 전기 자동차로 보내 전기 자동차를 충전하는 방법을 제공함에 있다.The inventors of the present invention devised the present invention to enable vehicle vs. vehicle charging using a portable electric vehicle charging cable. An object of the present invention in a first aspect of the present invention is to provide a method for charging an electric vehicle by sending electric power of the electric vehicle to another electric vehicle through a portable electric vehicle charging cable.
본 발명의 제2국면에 따른 발명의 목적은, 일반적인 전기 자동차를 이용하여 다른 차량으로 전원을 공급할 수 있도록 종래 전기 자동차의 배터리와 충전단자를 그대로 이용함으로써 범용성을 확보하는 데 있다.An object of the present invention according to the second aspect of the present invention is to ensure versatility by using a battery and a charging terminal of a conventional electric vehicle as it is to supply power to another vehicle using a general electric vehicle.
또한, 본 발명의 다른 목적은 위와 같은 충전 시스템을 통해 방전된 전기 자동차에 전력을 공급함으로써 긴급상황에서의 대기시간을 단축시키는 것에 있다.In addition, another object of the present invention is to shorten the waiting time in an emergency by supplying power to the electric vehicle discharged through the above charging system.
한편, 본 발명의 명시되지 않은 또 다른 목적들은 하기의 상세한 설명 및 그 효과로부터 용이하게 추론할 수 있는 범위 내에서 추가적으로 고려될 것이다.On the other hand, other unspecified objects of the present invention will be further considered within the range that can be easily inferred from the following detailed description and effects.
위와 같은 목적을 달성하기 위해 본 발명의 제1국면은,In order to achieve the above object, the first aspect of the present invention,
차대차(vehicle vs vehicle) 충전을 위해 개별 전기 자동차의 충전단자에 연결되는 한 쌍의 인렛; 및A pair of inlets connected to a charging terminal of an individual electric vehicle for charging a vehicle vs vehicle; And
한 쌍의 인렛 사이에 형성되어 차대차 충전을 제어하는 본체를 포함하는 휴대용 전기 자동차 충전케이블로서:A portable electric vehicle charging cable formed between a pair of inlets and including a main body for controlling chassis charging:
상기 본체는 The main body
공급되는 전압을 승압하는 컨버터;A converter for boosting a supplied voltage;
개별 전기 자동차에 설치된 배터리 제어부(Battery Management System: BMS)와 통신하는 통신부; 및A communication unit communicating with a battery control system (BMS) installed in an individual electric vehicle; And
상기 통신부로부터 신호를 수신하고 상기 컨버터를 제어하는 제어부를 포함하는 것을 특징으로 한다.And a control unit for receiving a signal from the communication unit and controlling the converter.
본 발명의 바람직한 어느 실시예에 따른 충전케이블의 본체는, 컨버터에 연결되어 전류의 역류를 방지하는 역류방지회로를 더 포함할 수 있다. The main body of the charging cable according to an exemplary embodiment of the present invention may further include a backflow prevention circuit connected to the converter to prevent backflow of current.
또한, 본 발명의 바람직한 어느 실시예에 따른 충전케이블의 상기 제어부는,In addition, the control unit of the charging cable according to an embodiment of the present invention,
전력을 공급하는 전기 자동차의 배터리제어부(BMS)로부터 충전허가 신호를 수신하고,Receives a charge permission signal from the battery control unit (BMS) of the electric vehicle for supplying power,
전력을 공급받는 전기 자동차의 배터리제어부(BMS)로부터 충전요청 신호 및 배터리 충전상태(State of Charge: SOC)를 수신하도록 할 수 있다.The controller may be configured to receive a charge request signal and a state of charge (SOC) from a battery control unit (BMS) of a powered electric vehicle.
또한, 본 발명의 바람직한 어느 실시예에 따른 차대차 충전을 위한 휴대용 전기 자동차 충전방법에 있어서, In addition, in a portable electric vehicle charging method for charging the vehicle according to an embodiment of the present invention,
휴대용 전기 자동차 충전케이블에 포함된 한 쌍의 인렛을 두 대의 전기 자동차의 충전단자에 각각 연결하는 단계;Connecting the pair of inlets included in the portable electric vehicle charging cable to the charging terminals of the two electric vehicles, respectively;
휴대용 전기 자동차 충전케이블이 전력을 공급하는 전기 자동차의 배터리제어부(BMS)로부터 충전허가 신호를 수신하는 단계;Receiving a charge permission signal from a battery control unit (BMS) of an electric vehicle to which the portable electric vehicle charging cable supplies power;
전력을 공급받는 전기 자동차의 배터리제어부(BMS)로부터 충전요청 신호를 수신하는 단계;Receiving a charge request signal from a battery control unit (BMS) of a powered electric vehicle;
전력을 공급하는 전기 자동차에서 인가된 입력전압을 승압하는 단계; 및Boosting an input voltage applied by an electric vehicle that supplies power; And
휴대용 전기 자동차 충전케이블이 충전을 개시하고, 전력을 공급받는 전기 자동차의 배터리 충전상태(State of Charge: SOC)를 모니터링하는 단계를 포함할 수 있다.The portable electric vehicle charging cable may include charging and monitoring a state of charge (SOC) of a powered electric vehicle.
본 발명의 제2국면은 차대차 전기 자동차용 충전 시스템에 관한 것으로서:A second aspect of the invention relates to a charging system for a chassis electric vehicle:
외부에서 공급받은 전력을 저장하거나 저장된 전력을 외부로 공급하기 위한 배터리;A battery for storing externally supplied power or supplying stored power to the outside;
상기 배터리로부터 출력되는 전압을 기설정된 전위로 승압하는 승압부;A boosting unit boosting the voltage output from the battery to a predetermined potential;
상기 배터리의 충전 또는 방전 시 외부와의 연결을 위한 충전단자;A charging terminal for connection with the outside during charging or discharging of the battery;
상기 충전단자와 상기 배터리 또는 상기 승압부를 선택적으로 연결하기 위한 스위치; 및A switch for selectively connecting the charging terminal with the battery or the boosting part; And
충전 시스템의 충전모드 또는 방전모드에 따라 상기 스위치를 제어하되, 상기 충전 시스템이 충전모드인 경우 상기 충전단자와 상기 배터리가 연결되도록 상기 스위치를 제어하고, 상기 충전 시스템이 방전모드인 경우 상기 충전단자와 상기 승압부가 연결되도록 상기 스위치를 제어하는 제어부를 포함하는 것을 특징으로 한다.The switch is controlled according to a charging mode or a discharging mode of a charging system, and the switch is controlled to connect the charging terminal and the battery when the charging system is in the charging mode, and the charging terminal when the charging system is in the discharge mode. And a control unit for controlling the switch to connect the boosting unit.
또한, 본 발명의 바람직한 어느 실시예에 따른 전기 자동차용 충전 시스템에 있어서, 상기 충전단자는 충전 케이블의 결합 방향을 판단하는 인식부를 포함하고, 상기 인식부의 판단 결과를 상기 제어부에 전달하여 상기 제어부가 상기 판단 결과에 따라 상기 스위치를 제어할 수 있다.In addition, in the charging system for an electric vehicle according to an exemplary embodiment of the present invention, the charging terminal includes a recognizing unit that determines a coupling direction of a charging cable, and transmits the determination result of the recognizing unit to the control unit to provide the control unit. The switch may be controlled according to the determination result.
또한, 본 발명의 바람직한 어느 실시예에 따른 전기 자동차용 충전 시스템에 있어서, 상기 충전단자와 연결되는 충전 케이블을 더 포함하고, 상기 충전 케이블은 일측면에 케이블의 결합 방향을 나타내는 인식장치를 포함하며,In addition, in the charging system for an electric vehicle according to an embodiment of the present invention, further comprising a charging cable connected to the charging terminal, the charging cable includes a recognition device indicating the coupling direction of the cable on one side ,
상기 인식부는 상기 인식장치의 유무에 따라 상기 케이블의 결합방향을 판단하도록 할 수 있다.The recognition unit may determine the coupling direction of the cable according to the presence or absence of the recognition device.
위와 같은 본 발명의 과제해결수단을 통해서, 본 발명은 타인의 전기 자동차를 이용하여 배터리가 방전됨으로써 긴급 상황에 직면한 전기 자동차를 충전할 수 있는 효과가 있다. 전용 충전 시스템이 아니라 보통의 전기 자동차로부터 긴급하게 전력을 공급받을 수 있기 때문이다.Through the problem solving means of the present invention as described above, the present invention has the effect of charging the electric vehicle in the face of an emergency by discharging the battery using the electric vehicle of another person. This is because it can be urgently powered from an ordinary electric vehicle instead of a dedicated charging system.
또한, 전용 충전 시스템을 갖춘 차량이 도달할 때까지 기다리지 않아도 되므로 충전을 위한 대기시간을 줄일 수 있다는 장점이 있다.In addition, there is an advantage that it is possible to reduce the waiting time for charging because it does not have to wait until the vehicle with a dedicated charging system arrives.
한편, 여기에서 명시적으로 언급되지 않은 효과라 하더라도, 본 발명의 기술적 특징에 의해 기대되는 이하의 명세서에서 기재된 효과 및 그 잠정적인 효과는 본 발명의 명세서에 기재된 것과 같이 취급됨을 첨언한다.On the other hand, even if the effects are not explicitly mentioned herein, the effects described in the following specification expected by the technical features of the present invention and its provisional effects are treated as described in the specification of the present invention.
도 1은 종래 기술에 따른 전기 자동차 충전 시스템의 구성 예를 나타낸다.1 shows a configuration example of an electric vehicle charging system according to the prior art.
도 2는 도 1을 보다 구체적으로 나타내는 도면이다.FIG. 2 is a view showing FIG. 1 in more detail.
도 3은 본 발명의 기술사상을 개념적으로 나타내는 도면이다. 3 is a view conceptually illustrating the technical idea of the present invention.
도 4는 본 발명의 바람직한 실시예에 따른 따른 휴대용 전기 자동차 충전케이블 개략적인 구성을 나타낸다.Figure 4 shows a schematic configuration of a portable electric vehicle charging cable according to a preferred embodiment of the present invention.
도 5는 본 발명의 역전류 방지회로의 바람직한 실시예를 나타내는 도면이다.5 is a view showing a preferred embodiment of the reverse current prevention circuit of the present invention.
도 6은 본 발명의 바람직한 실시예에 따른 전기 자동차 충전방법의 전체 프로세스를 개략적으로 나타내었다.6 schematically shows an entire process of an electric vehicle charging method according to a preferred embodiment of the present invention.
도 7은 본 발명의 제2국면에서의 바람직한 어느 실시예에 따른 충전 시스템의 구성 예를 나타낸다.7 shows an example of the configuration of a charging system according to a preferred embodiment of the second aspect of the present invention.
도 8은 본 발명의 일 실시예에 따라 챠량간 긴급 충전을 나타내는 도면이다.8 is a view showing emergency charging between vehicles according to an embodiment of the present invention.
도 9는 본 발명의 다른 실시예 따라 차량 대 충전 스테이션 간의 충전을 나타내는 도면이다.9 is a diagram illustrating charging between a vehicle and a charging station according to another embodiment of the present invention.
도 10은 본 발명의 또 다른 실시예에 따라 충/방전을 자동으로 인식하는 시스템의 구성 예를 나타낸다.10 shows an example of the configuration of a system that automatically recognizes the charge / discharge according to another embodiment of the present invention.
※ 첨부된 도면은 본 발명의 기술사상에 대한 이해를 위하여 참조로서 예시된 것임을 밝히며, 그것에 의해 본 발명의 권리범위가 제한되지는 아니한다.The accompanying drawings show that they are illustrated as a reference for understanding the technical idea of the present invention, by which the scope of the present invention is not limited.
이하, 첨부된 도면을 참조하여 본 발명의 실시를 위한 구체적인 내용을 설명한다. 그리고 본 발명을 설명함에 있어서 관련된 공지기능에 대하여 이 분야의 기술자에게 자명한 사항으로서 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략한다.Hereinafter, with reference to the accompanying drawings will be described specific details for the practice of the invention. In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by those skilled in the art with respect to the known functions related thereto, the detailed description thereof will be omitted.
도 1은 종래 기술에 따른 전기 자동차 충전 시스템의 구성 예를 나타낸다. 종래 기술에 따르면 전기 자동차(2)의 충전을 위해서 충전 스테이션(1)을 필요로 한다.1 shows a configuration example of an electric vehicle charging system according to the prior art. According to the prior art, the charging station 1 is required for charging the electric vehicle 2.
종래 기술의 충전 스테이션(1)은 제어부(1x), 승압컨버터(1y) 및 충전단자(1z)를 포함한다.The charging station 1 of the prior art includes a control unit 1x, a boost converter 1y and a charging terminal 1z.
충전 스테이션(1)은 전원 그리드 또는 가정용 전원에서 공급되는 AC 또는 DC 전원을 DC전원으로 변환한다. 필요한 경우 기설정된 출력 전압으로 승압하여 전기 자동차(2)에 공급한다. 이러한 충전 시스템에 관한 표준 중 하나인 IEC 61851-23 (DC electric vehicle charging station) 표준에는 최대 입력전압과 출력 DC 전압 등이 규정되어 있다.The charging station 1 converts AC or DC power supplied from a power grid or home power into DC power. If necessary, it is boosted to a predetermined output voltage and supplied to the electric vehicle 2. One of the standards for these charging systems, the IEC 61851-23 (DC electric vehicle charging station) standard, specifies the maximum input voltage and output DC voltage.
이를 위해 충전 스테이션(1)는 승압 컨버터(1y)를 통해 입력 전원이 AC 전원인 경우 DC로 변환하고, 전기 자동차(2)의 충전을 위해 정해진 전압으로 변환하여 전력을 전기 자동차(2)로 전송한다. 충전을 위한 전압으로는 400V 또는 500V 등의 고전압이 사용된다.To this end, the charging station 1 converts the input power into DC when the input power is AC power through the step-up converter 1y, and converts the power into a predetermined voltage for charging the electric vehicle 2 to transmit power to the electric vehicle 2. do. As a voltage for charging, a high voltage such as 400V or 500V is used.
전기 자동차(2)는 충전을 위해 충전 스테이션(1)과 제어 시그널을 서로 교환한다. 이를 위해서는 CAN(Controller Area Network), MOST(Multimedia Oriented Systems Transport), LIN(Local Interconnect Network) 등의 다양한 차량 통신 방식이 사용될 수 있다.The electric vehicle 2 exchanges control signals with the charging station 1 for charging. To this end, various vehicle communication methods such as a controller area network (CAN), a multimedia oriented systems transport (MOST), and a local interconnect network (LIN) may be used.
전기 자동차(2)는 충전 스테이션(1)으로부터 충전 단자(2z)를 통해 전력을 공급받아 내부 배터리(2y)에 전력을 저장하여 사용한다. The electric vehicle 2 receives power from the charging station 1 through the charging terminal 2z and stores and uses the power in the internal battery 2y.
도 2는 충전 스테이션(1)과 전기 자동차(2) 사이의 전력 및 제어신호가 송수신되는 구조를 좀 더 자세히 나타낸다. 도 2에서 충전 스테이션(1)의 "a"는 교류/직류 변압기, "b"는 퓨즈, "c"는 데이터 통신 제어기, "d"는 커넥터 잠금 장치 제어회로를 나타낸다. 또한 전기 자동차(2)에서 "f"는 릴레이 제어회로, "g" 및 "h"는 인식회로를 나타낸다. 본 발명의 충전 시스템은 도 1 및 도 2의 충전 스테이션(1)과 전기 자동차(2) 사이의 충전 시스템의 다양한 표준 기술을 사용할 수 있다. 그러나 본 발명의 요체는 충전 스테이션(1)과 전기 자동차(2) 사이의 충전 시스템이 아니라, 차량 간 충전 시스템에 있음을 이제부터 상세하고 다양하게 설명한다.2 shows in more detail the structure in which power and control signals are transmitted and received between the charging station 1 and the electric vehicle 2. In FIG. 2, "a" of the charging station 1 represents an AC / DC transformer, "b" represents a fuse, "c" represents a data communication controller, and "d" represents a connector lock control circuit. In the electric vehicle 2, "f" denotes a relay control circuit, and "g" and "h" denote a recognition circuit. The charging system of the present invention may use various standard techniques of the charging system between the charging station 1 and the electric vehicle 2 of FIGS. 1 and 2. However, the subject matter of the present invention will now be described in detail and in a variety of ways, not in the charging system between the charging station 1 and the electric vehicle 2, but in the inter-vehicle charging system.
도 3 내지 도 6은 본 발명의 제1국면에 관련한다. 먼저 도 3은 본 발명의 기술사상을 개념적으로 나타내었다.3 to 6 relate to a first aspect of the invention. First, Fig. 3 conceptually illustrates the technical idea of the present invention.
도 3에서 알 수 있듯이, 휴대용 전기 자동차 충전케이블(100)은 차대차(Vehicle vs. Vehicle) 충전을 위한 충전케이블이며 휴대할 수 있는 크기이다. 바람직한 실시예에서 충전케이블(100)은 한 쌍의 인렛(110)과 본체(120)로 구성된다.As can be seen in Figure 3, the portable electric vehicle charging cable 100 is a charging cable for charging vehicle (Vehicle vs. Vehicle) and is portable size. In a preferred embodiment, the charging cable 100 is composed of a pair of inlets 110 and the body 120.
한 쌍의 인렛(110) 중 하나는 전력을 공급하는 전기 자동차(10)의 충전단자에 연결된다. 다른 인렛(110)은 전력을 공급받으려는 전기 자동차(20)(배터리가 방전된 긴급 상태의 전기 자동차를 뜻한다)의 충전단자에 연결된다. One of the pair of inlets 110 is connected to a charging terminal of the electric vehicle 10 that supplies power. The other inlet 110 is connected to a charging terminal of the electric vehicle 20 (meaning an emergency electric vehicle in which the battery is discharged) to be supplied with power.
본체(120)는 한 쌍의 인렛 사이에 형성되어 차대차 충전을 제어하는 구성이다. 인렛(110)과 본체(120) 사이에는 케이블이 연결된다. 케이블은 전력선과 통신선이 포함된다. 통신선은 CAN 통신 방식으로 신호를 주고받을 수 있다.The main body 120 is formed between the pair of inlets to control the vehicle charging. A cable is connected between the inlet 110 and the main body 120. The cable includes a power line and a communication line. Communication lines can send and receive signals in CAN communication.
도 4는 본 발명의 일 실시예에 따른 충전 시스템의 구성을 예시한다. 도 4에서 알 수 있듯이, 본체(120)는 통신부(121), 제어부(123), 역전류 방지회로(125), 및 컨버터(127)를 포함한다.4 illustrates a configuration of a charging system according to an embodiment of the present invention. As can be seen in FIG. 4, the main body 120 includes a communication unit 121, a control unit 123, a reverse current prevention circuit 125, and a converter 127.
충전케이블(100)의 통신부(121)는 개별 전기 자동차(10, 20)와 통신한다. 바람직한 실시예에서 통신부(121)는 CAN 통신 방식으로 통신할 수 있다.The communication unit 121 of the charging cable 100 communicates with the individual electric vehicles 10 and 20. In a preferred embodiment, the communication unit 121 may communicate in a CAN communication method.
충전케이블(100)의 제어부(123)는 상기 통신부(121)를 통해 개별 전기 자동차(10, 20)에 설치된 배터리제어부(BMS: 11, 21)와 통신한다. 제어부(123)는 배터리(12, 22)의 충전상태(SOC)에 관한 각종 정보를 수집할 수 있다. 제어부(123)는 전력을 제공하는 전기 자동차(10)와 충전을 요청하는 전기 자동차(20)를 판별하여 충전을 개시할 수 있다. 또한, 제어부(123)는 충전방향에 따라 역전류 방지회로(125)를 스위칭하며, 충전을 위해 컨버터(127)를 제어하여 승압되는 전압을 조절한다. The control unit 123 of the charging cable 100 communicates with the battery control units BMS 11 and 21 installed in the individual electric vehicles 10 and 20 through the communication unit 121. The controller 123 may collect various types of information regarding the state of charge (SOC) of the batteries 12 and 22. The controller 123 may determine the electric vehicle 10 providing the power and the electric vehicle 20 requesting the charging to start charging. In addition, the controller 123 switches the reverse current prevention circuit 125 according to the charging direction, and controls the converter 127 to adjust the boosted voltage for charging.
역전류 방지회로(125)는 전류가 충전방향과 반대로 역류하는 것을 방지한다. 바람직한 실시예에서 역전류 방지회로(125)는 역전류 방지용 다이오드로서 제너다이오드를 포함할 수 있다.The reverse current prevention circuit 125 prevents the current from flowing backward as opposed to the charging direction. In a preferred embodiment, the reverse current prevention circuit 125 may include a zener diode as a reverse current prevention diode.
컨버터(127)는 공급되는 전압을 승압한다. 전기 자동차의 배터리(22)를 충전하기 위해서는 충전하려는 측의 전압이 충전을 받는 측의 전압보다 높아야 한다. 제어부(123)는 전력을 공급하는 전기 자동차의 배터리 전압을 측정하여 전압이 400V 이하인 경우 이를 400V까지 승압시킬 수 있다. The converter 127 boosts the voltage supplied. In order to charge the battery 22 of the electric vehicle, the voltage of the side to be charged must be higher than the voltage of the side to be charged. The controller 123 may measure the battery voltage of the electric vehicle that supplies power and boost the voltage to 400V when the voltage is 400V or less.
한편, 바람직한 실시예에서 본 발명의 인렛은 동일한 형태일 수 있다. 따라서, 사용자는 충전하려는 측과 충전받으려는 측의 인렛을 구분하지 않고 사용할 수 있다. 이를 가능하게 하기 위해 제어부는 전력을 공급하는 전기 자동차(10)의 배터리 제어부(BMS)로부터 충전허가 신호 및 배터리 충전상태(State of Charge: SOC)를 수신하고, 전력을 공급받는 전기 자동차(20)의 배터리 제어부(BMS)로부터 충전요청 신호 및 배터리 충전상태(State of Charge: SOC)를 수신할 수 있다.Meanwhile, in the preferred embodiment, the inlet of the present invention may have the same shape. Therefore, the user can use the inlet of the side to be charged and the side to be charged without distinguishing. In order to enable this, the controller receives a charge permission signal and a state of charge (SOC) from a battery controller BMS of the electric vehicle 10 that supplies power, and receives the electric vehicle 20 that is supplied with power. A charge request signal and a state of charge (SOC) may be received from the battery controller BMS.
도 5는 본 발명의 역전류 방지회로(125)의 바람직한 구성을 예시한다. 이 역전류 방지회로(125)는, 전류의 방향에 따라 역전류 방지용 다이오드를 선택할 수 있는 스위칭회로를 더 포함할 수 있다. 전류의 방향이 A에서 B인 경우에는 제1스위칭소자(x)를 연결하고 제2스위칭소자(y)를 개방하여 제1역류방지용 다이오드(125a)가 동작하도록 한다. 반대로 전류의 방향이 B에서 A인 경우에는 제1스위칭소자(x)를 개방하고 제2스위칭소자(y)를 연결하여 제2역류방지용 다이오드(125b)가 동작하도록 한다. 충전케이블(100)의 제어부(123)는 충전허가 신호, 충전요청 신호, 배터리 충전상태를 종합하여 전류의 방향을 판단한 후, 제1스위칭소자(x) 및 제2스위칭소자(y)를 제어한다.5 illustrates a preferred configuration of the reverse current prevention circuit 125 of the present invention. The reverse current prevention circuit 125 may further include a switching circuit capable of selecting a reverse current prevention diode according to the direction of the current. When the current direction is A to B, the first switching element x is connected and the second switching element y is opened to operate the first backflow prevention diode 125a. On the contrary, when the direction of the current is B to A, the second switching element 125b is operated by opening the first switching element x and connecting the second switching element y to each other. The controller 123 of the charging cable 100 determines the direction of the current by combining the charge permission signal, the charge request signal, and the state of charge of the battery, and then controls the first switching element x and the second switching element y. .
도 6은 위와 같은 충전 시스템 구성을 이용해서 차대차 간의 전기 자동차 충전방법의 프로세스를 개략적으로 나타내었다. Figure 6 schematically shows the process of the electric vehicle charging method between the chassis using the above charging system configuration.
먼저, 휴대용 전기 자동차 충전케이블에 포함된 한 쌍의 인렛을 두 대의 전기 자동차의 충전단자에 각각 연결한다(S110).First, a pair of inlets included in the portable electric vehicle charging cable are connected to charging terminals of two electric vehicles, respectively (S110).
두 대의 전기 자동차를 연결한 후에 차대차 충전모드를 실행한다(S120). 이를 위해 먼저 휴대용 전기 자동차 충전케이블이 전력을 공급하는 전기 자동차의 배터리제어부(BMS)로부터 충전허가 신호를 수신할 수 있다. 충전허가 신호는 전기 자동차가 자신의 배터리에서 전력을 공급하는 것을 허여하는 신호이다. 또한, 휴대용 전기 자동차 충전케이블이 전력을 공급받는 전기 자동차의 배터리제어부(BMS)로부터 충전요청 신호를 수신할 수 있다. 충전요청 신호는 전기 자동차가 충전을 요청하는 신호이다.After connecting two electric cars, the vehicle runs the charging mode (S120). To this end, the portable electric vehicle charging cable may first receive a charge permission signal from the battery control unit (BMS) of the electric vehicle that supplies power. The charge permission signal is a signal that allows an electric vehicle to supply power from its battery. In addition, the portable electric vehicle charging cable may receive a charge request signal from the battery control unit (BMS) of the electric vehicle is powered. The charge request signal is a signal that the electric vehicle requests to charge.
휴대용 전기 자동차 충전케이블이 두 대의 전기 자동차의 배터리 전압을 측정할 수 있다. 충전케이블 본체의 제어부가 측정된 전압을 비교하고 승압량을 산정한다. 바람직한 실시예에서 제어부는 전력을 공급하는 측의 전압이 400V 미만인 경우 이를 400V로 승압할 수 있다(S130).A portable electric vehicle charging cable can measure the battery voltage of two electric vehicles. The control unit of the charging cable main body compares the measured voltage and calculates the boosted amount. In a preferred embodiment, the controller may boost the voltage to 400V when the voltage at the power supply side is less than 400V (S130).
휴대용 전기 자동차 충전케이블이 충전을 개시하고, 전력을 공급받는 전기 자동차의 배터리 충전상태(State of Charge: SOC)를 모니터링한다(S140). 충전케이블은 모니터링한 결과를 분석하여 배터리의 충전량, 주행가능거리, 충전소요시간 등을 출력할 수 있다.The portable electric vehicle charging cable starts charging and monitors a state of charge (SOC) of a battery powered electric vehicle (S140). The charging cable analyzes the monitoring result and outputs the battery's charge level, driving distance, and charging time.
도 7 내지 도 10은 본 발명의 제2국면에 따른 충전 시스템을 개시한다. 제1국면은 휴대용 전기 자동차 충전케이블에 설치된 제어부의 구성 및 작용을 중심으로 설명했다. 본 발명의 제2국면은 각각의 전기 자동차 내부의 구성 및 작용을 통해서 차대차 충전의 기술을 개시한다. 제1국면 및 제2국면을 좀더 용이하게 구별하며, 설명의 편의를 도모하고자, 동일한 구성일지라도 가급적 도면 부호로서 다른 숫자를 사용하고자 했다. 먼저 도 7은 본 발명의 전기 자동차 내부에 구성되는 충전 시스템(300)의 예를 나타낸다.7-10 disclose a charging system according to a second aspect of the present invention. The first aspect has been described focusing on the configuration and operation of the control unit installed in the portable electric vehicle charging cable. The second aspect of the present invention discloses a technique for charging the vehicle chassis through the construction and operation of each electric vehicle interior. In order to distinguish the first phase and the second phase more easily and to facilitate the explanation, other numbers are used as the reference numerals, even if the same configuration. First, FIG. 7 shows an example of a charging system 300 configured inside an electric vehicle of the present invention.
차량간 충전을 위한 본 발명에 따른 전기 자동차의 충전 시스템(300)은 제어부(310), 배터리(320), 승압부(330), 스위치(340), 충전단자(350) 및 다이오드(360)로 구성될 수 있다. Charging system 300 of the electric vehicle according to the present invention for inter-vehicle charging is the control unit 310, the battery 320, the boosting unit 330, the switch 340, the charging terminal 350 and the diode 360 Can be configured.
전술한 것처럼 다른 전기 자동차의 충전을 위해서는 400V 내지 500V의 고전압이 필요하다. 또한, 완충된 전기 자동차의 배터리 전압이 방전된 전기 자동차의 배터리 전압보다 낮으면 충전 동작이 정상적으로 이루어지지 않을 수 있다. 따라서 배터리(320)의 출력 전압을 필요한 전압으로 상승시키기 위해 승압부(330)가 사용된다.As described above, the charging of other electric vehicles requires a high voltage of 400V to 500V. Also, when the battery voltage of the fully charged electric vehicle is lower than the battery voltage of the discharged electric vehicle, the charging operation may not be performed normally. Therefore, the booster 330 is used to increase the output voltage of the battery 320 to the required voltage.
차량간 충전을 위해서 충전 시스템(300)의 배터리(320)는 충전과 방전이 모두 가능한 양방향성을 가져야 하고, 범용성을 위해 충전단자(350)는 충전시와 방전시에 모두 사용된다. 스위치(340)가 이러한 동작을 스위칭한다. 즉, 스위치(340)는 제어부(310)의 제어에 의해 충전단자(350)와 배터리(320)를 선택적으로 연결한다. 충전 시스템(300)이 충전 모드인 경우, 충전단자(350)와 배터리(320)가 직접 연결되도록 스위치(340)가 제어된다. 이때 외부의 전력이 충전단자(350)를 통해 배터리(320)로 공급되어 충전이 진행된다. 반면 충전 시스템(310)이 방전 모드인 경우, 충전단자(350)와 승압부(330)가 연결되도록 스위치(340)가 제어된다. 이때 배터리(320)의 전력이 필요한 전압으로 승압되어 외부로 공급된다.For inter-vehicle charging, the battery 320 of the charging system 300 should have both directions of charging and discharging, and for the sake of versatility, the charging terminal 350 is used for both charging and discharging. Switch 340 switches this operation. That is, the switch 340 selectively connects the charging terminal 350 and the battery 320 under the control of the controller 310. When the charging system 300 is in the charging mode, the switch 340 is controlled to directly connect the charging terminal 350 and the battery 320. At this time, external power is supplied to the battery 320 through the charging terminal 350 to perform charging. On the other hand, when the charging system 310 is in the discharge mode, the switch 340 is controlled to connect the charging terminal 350 and the boosting unit 330. At this time, the power of the battery 320 is boosted to the required voltage and supplied to the outside.
충전단자(350)는 충전케이블(미도시)의 연결을 위해 사용되며 배터리(320)의 충전 또는 방전을 위한 전력 단자와 제어부(310)와 다른 전기 자동차 또는 충전소 등의 충전 시스템과의 통신을 위한 통신 단자를 포함한다.The charging terminal 350 is used to connect a charging cable (not shown), and is used to communicate with a power terminal for charging or discharging the battery 320 and a controller 310 and a charging system such as another electric vehicle or charging station. It includes a communication terminal.
제어부(310)는 사용자의 조작에 따라 또는 다른 충전 시스템과의 통신을 통해 충전 모드를 결정하고, 충전 모드에 따라 스위치(340)를 제어한다.The controller 310 determines a charging mode according to a user's operation or through communication with another charging system, and controls the switch 340 according to the charging mode.
역전류 방지용 다이오드(360)는 전술한 것처럼 충전 시스템(300)의 스위치(340) 연결 오류로 인한 역전류를 차단한다. 사용자가 충전 모드를 잘못 선택하거나, 통신 오류 등으로 말미암아 충전 시스템(300)의 연결과 다르게 충전 모드가 선택되는 경우에 오동작이 발생한다. 즉, 충전 모드인데 스위치(340)가 승압부와 연결되거나, 방전 모드인데 스위치(340)가 배터리와 연결된 경우에는 역전류 방지용 다이어드(360)가 역전류를 차단한다. 그렇게 해서 충전이 되지 않거나 충전 시스템(300)의 파손을 막을 수 있다. The reverse current prevention diode 360 blocks the reverse current due to the switch 340 connection error of the charging system 300 as described above. A malfunction occurs when a user selects a charging mode incorrectly, or a charging mode is selected differently from the connection of the charging system 300 due to a communication error. That is, when the switch 340 is connected to the booster in the charging mode or the switch 340 is connected to the battery in the discharge mode, the reverse current blocking dial 360 blocks the reverse current. Doing so can prevent charging or damage to the charging system 300.
도 8의 실시예는 다른 전기 자동차에 전력을 공급하는 경우의 시스템의 구성 예이다. 제1전기 자동차의 충전 시스템(300)이 제2 전기 자동차(400)의 충전 시스템으로 긴급하게 전력을 공급하는 경우, 제어부(310)는 전력을 공급받는 전기 자동차의 충전 시스템(400)과의 통신을 통해 충전 모드를 결정한다. 이때 제어부(310)는 일반적인 전기 자동차 충전소에서 전송하는 제어신호를 CAN 통신 등의 차량 통신 프로토콜을 이용하여 다른 전기 자동차의 충전 시스템(400)에 전송할 수 있다.8 is a configuration example of a system in the case of supplying power to another electric vehicle. When the charging system 300 of the first electric vehicle urgently supplies power to the charging system of the second electric vehicle 400, the controller 310 communicates with the charging system 400 of the electric vehicle that is powered. Determine the charging mode through. In this case, the controller 310 may transmit a control signal transmitted from a general electric vehicle charging station to a charging system 400 of another electric vehicle using a vehicle communication protocol such as CAN communication.
제1 전기 자동차의 충전 시스템(300)의 충전 모드가 제2 전기 자동차의 충전 시스템(400)으로 전력을 공급하는 모드로 결정되면 제1 전기 자동차의 제어부(310)는 스위치(340)를 제어하여 승압부(330)와 충전단자(350)가 연결되도록 한다. 스위치가 연결되면 배터리(320)에서 승압부(330)를 거친 전력은 충전단자(350)와 케이블을 통해 충전이 필요한 전기 자동차의 충전 시스템(400)으로 공급된다. When the charging mode of the charging system 300 of the first electric vehicle is determined to be a mode for supplying power to the charging system 400 of the second electric vehicle, the controller 310 of the first electric vehicle controls the switch 340. The booster 330 and the charging terminal 350 are connected. When the switch is connected, the power passing through the boosting unit 330 from the battery 320 is supplied to the charging system 400 of the electric vehicle that needs to be charged through the charging terminal 350 and the cable.
이를 통해 방전된 전기 자동차가 충전소까지 이동하거나 특수한 장비를 갖춘 다른 차량을 기다리지 않고도 간단하게 충전이 가능하고, 충전된 전력을 이용하여 충전기가 있는 곳까지 이동할 수 있는 효과가 있다.This makes it easy to charge a discharged electric vehicle without having to travel to a charging station or wait for another vehicle with special equipment, and use the charged power to move to a charger.
도 9는 도 8과는 달리, 충전 스테이션과 연결에 관하여 그 구성 및 작용을 예시한다. 제어부(310)는 충전 스테이션(500)과의 통신을 통해 충전 모드를 결정하고, 전원을 공급받는 모드로 정해지면 스위치(340)가 충전단자(350)와 배터리(320)를 바로 연결하도록 제어한다.FIG. 9, unlike FIG. 8, illustrates its configuration and operation in connection with the charging station. The controller 310 determines the charging mode through communication with the charging station 500, and when the power supply mode is determined to be the power supply mode, the controller 310 controls the switch 340 to directly connect the charging terminal 350 and the battery 320. .
전원을 공급받는 모드일 때는 일반적인 전기 자동차의 충전 방식과 동일하게 동작하여 배터리(320)에 전력을 충전한다. 그런데 본 발명에 따른 전기 자동차의 충전 시스템(300)은 양방향 충전이 가능하므로 충전 또는 방전 모드를 사용자가 지정해야 하는 불편이 있다. 일반적인 전기 자동차 충전소를 이용하는 경우라면 충전소와의 통신을 통해 충전 모드를 결정할 수 있지만 차량간 충전의 경우에는 어떤 차량이 충전 모드이고 어떤 차량이 방전 모드인지 결정할 수 없기 때문이다. 충전 모드가 잘못 설정된다면 충전이 되지 않거나 최악의 경우 충전 시스템이 파손되는 경우도 발생할 수 있다.In the mode of receiving power, the battery 320 is charged in the same manner as a general electric vehicle charging method. However, since the charging system 300 of the electric vehicle according to the present invention is capable of bidirectional charging, it is inconvenient for a user to specify a charging or discharging mode. In the case of using a general electric vehicle charging station, the charging mode can be determined through communication with the charging station, but in the case of the inter-vehicle charging, it is impossible to determine which vehicle is the charging mode and which vehicle is the discharge mode. If the charging mode is set incorrectly, charging may fail or, in the worst case, damage the charging system.
따라서 본 발명은 제3국면으로 넘어간다. 도 10이 그러하다. 도 10의 전기 자동차의 충전 시스템(600)은 전용 충전 케이블(660)을 더 포함하여 구성될 수 있다.Thus, the present invention goes to the third phase. 10 is the same. The charging system 600 of the electric vehicle of FIG. 10 may further include a dedicated charging cable 660.
충전 케이블(660)은 방전 측 단자(662)와 충전 측 단자(666)가 구분되고, 방전 측 단자(662)는 충전모드 결정을 위한 인식장치(664)를 포함한다. 사용자의 인식을 위해 충전 케이블(660)에는 충전 측과 방전 측이 구분되어 표시될 수 있다.The charging cable 660 is divided into a discharge side terminal 662 and a charging side terminal 666, and the discharge side terminal 662 includes a recognition device 664 for determining a charging mode. The charging side and the discharge side may be separately displayed on the charging cable 660 to recognize the user.
충전 방향에 맞게 충전 케이블이 연결되면 충전 시스템(600)의 충전단자(650)에 포함된 인식부(652)는 충전 케이블(660)의 인식장치(662)가 연결되어 있는지 확인한다.When the charging cable is connected according to the charging direction, the recognition unit 652 included in the charging terminal 650 of the charging system 600 checks whether the recognition device 662 of the charging cable 660 is connected.
상기 충전 케이블(660)의 인식부(652)는 인식장치(662)의 연결 여부를 전기 자동차 충전 시스템(660)의 제어부(610)에 전달하고, 제어부(610)는 인식장치(662)의 연결 여부에 따라 스위치(640)를 제어한다. 또 다른 실시예에서는, 상기 인식부(652)가 인식장치(662) 연결 여부에 따라 직접 스위치(640)를 제어할 수도 있다. 또한 인식장치(662)의 연결 여부에 따라 제어부(610)는 차량의 표시장치나 사용자의 스마트폰, 또는 별도의 표시장치 등을 이용하여 사용자에게 차량의 충전모드를 알릴 수 있다.The recognition unit 652 of the charging cable 660 transmits whether the recognition device 662 is connected to the control unit 610 of the electric vehicle charging system 660, the control unit 610 is connected to the recognition device 662 The switch 640 is controlled according to whether or not. In another embodiment, the recognition unit 652 may directly control the switch 640 according to whether the recognition device 662 is connected. In addition, depending on whether the recognition device 662 is connected, the controller 610 may inform the user of the charging mode of the vehicle by using the display device of the vehicle, the user's smartphone, or a separate display device.
인식장치(662)가 포함되지 않은 충전 측 단자(666)가 연결된 충전 측 차량은 인식부에 의해 인식장치가 없음을 확인하면 충전 시스템 내부 스위치를 충전 모드로 제어함으로써 상대 차량으로부터 전력을 공급받는다.When the charging side vehicle to which the charging side terminal 666, which does not include the recognition apparatus 662, is connected, receives the recognition apparatus without the recognition apparatus, the charging side vehicle receives power from the other vehicle by controlling the internal switch of the charging system to the charging mode.
이렇게 케이블의 연결 방향에 따라 충전 또는 방전 모드를 자동으로 설정하게 함으로써 사용자의 조작 실수에 따른 오동작 또는 파손을 막을 수 있다.In this way, the charging or discharging mode is automatically set according to the connection direction of the cable, thereby preventing malfunction or damage caused by a user's mistake.
참고로, 본 발명의 일 실시예에 따른 충전 시스템의 제어 방법은 다양한 컴퓨터 수단을 통하여 수행될 수 있는 프로그램 명령 형태로 구현되어 컴퓨터 판독가능매체에 기록될 수 있다. 상기 컴퓨터 판독가능매체는 프로그램 명령, 데이터 파일, 데이터 구조 등을 단독으로 또는 조합하여 포함할 수 있다. 상기 매체에 기록되는 프로그램 명령은 본 발명을 위하여 특별히 설계되고 구성된 것들이거나 컴퓨터 소프트웨어 당업자에게 공지되어 사용 가능한 것일 수도 있다. For reference, the control method of the charging system according to an embodiment of the present invention may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
컴퓨터 판독가능매체의 예에는 하드 디스크, 플로피 디스크 및 자기 테이프와 같은 자기 매체, CD-ROM, DVD와 같은 광기록 매체, 플롭티컬 디스크(floptical disk)와 같은 자기-광 매체, 및 ROM, RAM, 플래시 메모리 등과 같은 프로그램 명령을 저장하고 수행하도록 특별히 구성된 하드웨어 장치가 포함될 수 있다. 프로그램 명령의 예에는 컴파일러에 의해 만들어지는 것과 같은 기계어코드뿐만 아니라 인터프리터 등을 사용해서 컴퓨터에 의해서 실행될 수 있는 고급언어코드를 포함한다. 상술한 하드웨어 장치는 본 발명의 동작을 수행하기 위해 하나 이상의 소프트웨어 모듈로서 작동하도록 구성될 수 있으며, 그 역도 마찬가지다.Examples of computer readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs, DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, Hardware devices specifically configured to store and execute program instructions, such as flash memory, may be included. Examples of program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.
본 발명의 보호범위가 이상에서 명시적으로 설명한 실시예의 기재와 표현에 제한되는 것은 아니다. 또한, 본 발명이 속하는 기술분야에서 자명한 변경이나 치환으로 말미암아 본 발명이 보호범위가 제한될 수도 없음을 다시 한 번 첨언한다.The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is again noted that the scope of protection of the present invention may not be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

Claims (7)

  1. 외부에서 공급받은 전력을 저장하거나 저장된 전력을 외부로 공급하기 위한 배터리;A battery for storing externally supplied power or supplying stored power to the outside;
    상기 배터리로부터 출력되는 전압을 기설정된 전위로 승압하는 승압부;A boosting unit boosting the voltage output from the battery to a predetermined potential;
    상기 배터리의 충전 또는 방전 시 외부와의 연결을 위한 충전단자;A charging terminal for connection with the outside during charging or discharging of the battery;
    상기 충전단자와 상기 배터리 또는 상기 승압부를 선택적으로 연결하기 위한 스위치; 및A switch for selectively connecting the charging terminal with the battery or the boosting part; And
    충전 시스템의 충전모드 또는 방전모드에 따라 상기 스위치를 제어하되, 상기 충전 시스템이 충전모드인 경우 상기 충전단자와 상기 배터리가 연결되도록 상기 스위치를 제어하고, 상기 충전 시스템이 방전모드인 경우 상기 충전단자와 상기 승압부가 연결되도록 상기 스위치를 제어하는 제어부를 포함하는 것을 특징으로 하는, 전기 자동차용 충전 시스템.The switch is controlled according to a charging mode or a discharging mode of a charging system, and the switch is controlled to connect the charging terminal and the battery when the charging system is in the charging mode, and the charging terminal when the charging system is in the discharge mode. And a control unit for controlling the switch to connect the boosting unit.
  2. 제1항에 있어서,The method of claim 1,
    상기 충전단자는 충전 케이블의 결합 방향을 판단하는 인식부를 포함하고, 상기 인식부의 판단 결과를 상기 제어부에 전달하여 상기 제어부가 상기 판단 결과에 따라 상기 스위치를 제어하는 것인, 전기 자동차용 충전 시스템.The charging terminal includes a recognition unit for determining the coupling direction of the charging cable, and transmits the determination result of the recognition unit to the control unit to control the switch according to the determination result, the electric vehicle charging system.
  3. 제2항에 있어서,The method of claim 2,
    상기 충전단자와 연결되는 충전 케이블을 더 포함하고,Further comprising a charging cable connected to the charging terminal,
    상기 충전 케이블은 일측면에 케이블의 결합 방향을 나타내는 인식장치를 포함하며,The charging cable includes a recognition device indicating the coupling direction of the cable on one side,
    상기 인식부는 상기 인식장치의 유무에 따라 상기 케이블의 결합방향을 판단하는 것인, 전기 자동차용 충전 시스템.The recognition unit is to determine the coupling direction of the cable according to the presence or absence of the recognition device, charging system for an electric vehicle.
  4. 차대차(vehicle vs vehicle) 충전을 위해 개별 전기 자동차의 충전단자에 연결되는 한 쌍의 인렛; 및A pair of inlets connected to a charging terminal of an individual electric vehicle for charging a vehicle vs vehicle; And
    한 쌍의 인렛 사이에 형성되어 차대차 충전을 제어하는 본체를 포함하는 휴대용 전기 자동차 충전케이블로서:A portable electric vehicle charging cable formed between a pair of inlets and including a main body for controlling chassis charging:
    상기 본체는 The main body
    공급되는 전압을 승압하는 컨버터;A converter for boosting a supplied voltage;
    개별 전기 자동차에 설치된 배터리 제어부(Battery Management System: BMS)와 통신하는 통신부; 및A communication unit communicating with a battery control system (BMS) installed in an individual electric vehicle; And
    상기 통신부로부터 신호를 수신하고 상기 컨버터를 제어하는 제어부를 포함하는 것을 특징으로 하는, And a controller for receiving a signal from the communication unit and controlling the converter.
    차대차 충전을 위한 휴대용 전기 자동차 충전케이블.Portable electric vehicle charging cable for vehicle chassis charging.
  5. 제4항에 있어서,The method of claim 4, wherein
    상기 본체는 상기 컨버터에 연결되어 전류의 역류를 방지하는 역류방지회로를 더 포함하는 것인,The main body further includes a backflow prevention circuit connected to the converter to prevent the backflow of the current,
    차대차 충전을 위한 휴대용 전기 자동차 충전케이블.Portable electric vehicle charging cable for vehicle chassis charging.
  6. 제4항에 있어서,The method of claim 4, wherein
    상기 제어부는The control unit
    전력을 공급하는 전기 자동차의 배터리제어부(BMS)로부터 충전허가 신호를 수신하고,Receives a charge permission signal from the battery control unit (BMS) of the electric vehicle for supplying power,
    전력을 공급받는 전기 자동차의 배터리제어부(BMS)로부터 충전요청 신호 및 배터리 충전상태(State of Charge: SOC)를 수신하는 것인,Receiving a charge request signal and a state of charge (SOC) from the battery control unit (BMS) of the electric vehicle is powered,
    차대차 충전을 위한 휴대용 전기 자동차 충전케이블.Portable electric vehicle charging cable for vehicle chassis charging.
  7. 휴대용 전기 자동차 충전케이블에 포함된 한 쌍의 인렛을 두 대의 전기 자동차의 충전단자에 각각 연결하는 단계;Connecting the pair of inlets included in the portable electric vehicle charging cable to the charging terminals of the two electric vehicles, respectively;
    휴대용 전기 자동차 충전케이블이 전력을 공급하는 전기 자동차의 배터리제어부(BMS)로부터 충전허가 신호를 수신하는 단계;Receiving a charge permission signal from a battery control unit (BMS) of an electric vehicle to which the portable electric vehicle charging cable supplies power;
    전력을 공급받는 전기 자동차의 배터리제어부(BMS)로부터 충전요청 신호를 수신하는 단계;Receiving a charge request signal from a battery control unit (BMS) of a powered electric vehicle;
    전력을 공급하는 전기 자동차에서 인가된 입력전압을 승압하는 단계; 및Boosting an input voltage applied by an electric vehicle that supplies power; And
    휴대용 전기 자동차 충전케이블이 충전을 개시하고, 전력을 공급받는 전기 자동차의 배터리 충전상태(State of Charge: SOC)를 모니터링하는 단계를 포함하는 것을 특징으로 하는, 차대차 충전을 위한 휴대용 전기 자동차 충전방법.A method of charging a portable electric vehicle for charging a vehicle, characterized in that the portable electric vehicle charging cable starts charging and monitoring a state of charge (SOC) of a powered electric vehicle.
PCT/KR2017/013684 2016-11-29 2017-11-28 Electric vehicle charging system capable of inter-vehicle charging WO2018101702A1 (en)

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KR10-2017-0114321 2017-09-07
KR1020170114321A KR102538406B1 (en) 2017-09-07 2017-09-07 Electric vehicle charging system for vehicle to vehicle charging

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