CN110497808B - Electric automobile charging system with multiple charging modes and charging method - Google Patents

Electric automobile charging system with multiple charging modes and charging method Download PDF

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Publication number
CN110497808B
CN110497808B CN201910805104.2A CN201910805104A CN110497808B CN 110497808 B CN110497808 B CN 110497808B CN 201910805104 A CN201910805104 A CN 201910805104A CN 110497808 B CN110497808 B CN 110497808B
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China
Prior art keywords
charging
power
electric automobile
electric
power supply
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Expired - Fee Related
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CN201910805104.2A
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Chinese (zh)
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CN110497808A (en
Inventor
吴晓刚
王昊
陈继忠
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China Electric Power Research Institute Co Ltd CEPRI
Harbin University of Science and Technology
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China Electric Power Research Institute Co Ltd CEPRI
Harbin University of Science and Technology
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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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (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

An electric vehicle charging system with multiple charging modes and a charging method belong to the technical field of electric vehicle charging. The problem of because voltage conversion device's restriction in the current battery charging station leads to unable high-power charging demand or the demand of filling soon that satisfies electric automobile is solved. The invention stores the electric energy of the power grid into the battery pack of the expansion structure from the AC/DC converter. When the electric automobile needs to be charged quickly, the electric automobile is charged by the power grid and the battery pack with the expansion structure at the same time; when the electric automobile is slowly charged, the power grid directly supplies power to a charging port of the electric automobile through the main AC/DC converter; when the electric automobile is not charged, the battery pack of the expansion structure is charged by the power grid; when the charging power requirements of the electric automobile are different, whether the required power of the electric automobile is larger than the rated output power of the conversion device or not is judged, and if yes, the expansion structure and the power grid supply power together. The invention is suitable for being used as the charging pile of the electric automobile.

Description

Electric automobile charging system with multiple charging modes and charging method
Technical Field
The invention relates to an energy storage and charging system for an electric automobile, and belongs to the technical field of electric automobile charging.
Background
People in the world pay more and more attention to environmental problems nowadays, in order to improve the environment, the use of clean energy has reached a consensus worldwide, especially the use of electric vehicles to replace fuel vehicles to reduce the emission of atmospheric pollutants. However, as the usage amount of the electric vehicle increases, the requirement for the increase of the endurance mileage of the electric vehicle is particularly obvious, and the endurance mileage of the battery is usually increased by increasing the capacity of the battery. However, the charging time of the battery in this way is long, which affects the use of people for automobiles, and therefore, it is an important direction for the development of the current battery charging technology to greatly shorten the charging time.
Because the AC/DC converter is needed to convert the alternating current output by the power grid into the direct current when the battery of the electric automobile is charged, when the charging demand power of the electric automobile is overlarge or the quick charging demand exists, the quick charging demand of the electric automobile can not be met due to the limitation of the voltage conversion device in the existing battery charging station.
Disclosure of Invention
The invention provides an electric vehicle charging system and a charging method with multiple charging modes, aiming at solving the problem that the high-power charging requirement or the quick charging requirement of an electric vehicle cannot be met due to the limitation of a voltage conversion device in the conventional battery charging station.
The invention relates to an electric vehicle charging system with multiple charging modes, which comprises an expansion structure 1, a main controller 2, a main AC/DC converter 3, an electric vehicle charging port 4 and three switches S1、S2And S3；
The electric vehicle charging port 4 is used for providing a charging port for an electric vehicle battery, collecting or setting required charging power of the electric vehicle, and sending the collected or set required charging power of the electric vehicle battery to the main controller 2;
the electric vehicle charging port 4 is also provided with a load detection end, and when no load connection is detected, a load disconnection signal is sent to the main controller 2;
the main controller 2 is used for receiving a power demand signal sent by the electric vehicle charging port 4 for charging the electric vehicle battery, judging whether the electric vehicle battery needs to be expanded or not according to the power demand for charging the electric vehicle battery and the rated power of the main AC/DC converter 3, and if so, controlling the switch S2And S3Closing the power grid and the expansion structure 1 to supply power to the charging port 4 of the electric automobile at the same time, otherwise, controlling the switch S3Closing the system to enable the power grid to supply power to the charging port 4 of the electric automobile;
the main controller 2 sends a self-charging control signal to the expansion structure 1 according to the received load unconnected signal; and controls the switch S when receiving the self-charging request signal sent by the extension structure 11Closing;
the expansion structure 1 comprises n power supply branches for the switch S2When closed, the charging port 4 of the electric automobile is powered; the main controller 2 is further configured to determine whether the n power supply branches need to be charged according to a self-charging control signal sent by the main controller 2, and send a self-charging request signal to the main controller 2 when at least one power supply branch needs to be charged;
the main AC/DC converter 3 is configured to perform AC/DC conversion on an electrical signal output by the power grid, and output the converted signal to the electric vehicle charging port 4.
A charging method of an electric vehicle with a plurality of charging modes is realized based on the electric vehicle charging system with a plurality of charging modes, and comprises the following steps:
a power grid independent power supply mode; when the rated output power of the main AC/DC converter 3 meets the power requirement of the electric automobile, the switch S is controlled3Closing; the power grid independently supplies power to the charging port 4 of the electric automobile;
the power grid and the extended structure 1 are in a power supply mode at the same time: when the charging demand power of the electric automobile is larger than the rated output power of the main AC/DC converter 3, the switch S is controlled2And S3And closing the power grid and the expansion structure 1 to supply power to the charging port 4 of the electric automobile at the same time.
The invention stores the electric energy of the power grid into the battery pack of the expansion structure from the AC/DC converter. When the electric automobile needs to be charged quickly, the electric automobile is charged by the power grid and the battery pack with the expansion structure at the same time; when the electric automobile is slowly charged, the power grid directly supplies power to a charging port of the electric automobile through the main AC/DC converter; when the electric automobile is not charged, the battery pack of the expansion structure is charged by the power grid; when the charging power requirements of the electric automobile are different, whether the required power of the electric automobile is larger than the rated output power of the conversion device or not is judged, if yes, the expansion structure and the power grid supply power together, when the battery has a quick charging requirement or a high-power supply requirement, the expansion structure and the power grid supply power together in a high-power mode, and the quick charging requirement is met.
Drawings
Fig. 1 is a schematic block diagram of an electric vehicle charging system with different charging modes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: the present embodiment is described below with reference to fig. 1, and the present embodiment describes a charging system for an electric vehicle with multiple charging modes, which includes an expansion structure 1, a main controller 2, a main AC/DC converter 3, an electric vehicle charging port 4, and three switches S1、S2And S3；
The electric vehicle charging port 4 is used for providing a charging port for an electric vehicle battery, collecting or setting required charging power of the electric vehicle, and sending the collected or set required charging power of the electric vehicle battery to the main controller 2;
the electric vehicle charging port 4 is also provided with a load detection end, and when no load connection is detected, a load disconnection signal is sent to the main controller 2;
the main controller 2 is used for receiving a power demand signal sent by the electric vehicle charging port 4 for charging the electric vehicle battery, judging whether the electric vehicle battery needs to be expanded or not according to the power demand for charging the electric vehicle battery and the rated power of the main AC/DC converter 3, and if so, controlling the switch S2And S3Closing the power grid and the expansion structure 1 to supply power to the charging port 4 of the electric automobile at the same time, otherwise, controlling the switch S3Closing the system to enable the power grid to supply power to the charging port 4 of the electric automobile;
main controller2, according to the received load unconnected signal, sending a self-charging control signal to the extended structure 1; and controls the switch S when receiving the self-charging request signal sent by the extension structure 11Closing;
the expansion structure 1 comprises n power supply branches for the switch S2When closed, the charging port 4 of the electric automobile is powered; the main controller 2 is further configured to determine whether the n power supply branches need to be charged according to a self-charging control signal sent by the main controller 2, and send a self-charging request signal to the main controller 2 when at least one power supply branch needs to be charged;
the main AC/DC converter 3 is configured to perform AC/DC conversion on an electrical signal output by the power grid, and output the converted signal to the electric vehicle charging port 4.
In this embodiment, the electric vehicle charging port 4 sets the required power by using a keyboard or a touch screen, and the setting signal output end of the keyboard or the touch screen is connected to the required power signal output/input end of the main controller 2. Thus, when the main controller receives a required power signal of the charging port 4 of the electric automobile, whether the received required power is larger than the rated power of the main AC/DC converter or not is judged, and if yes, the main controller controls the switch S2Closing, controlling the power grid and the expansion structure 1 to supply power simultaneously, otherwise, controlling S3And the closed power grid independently supplies power to the electric automobile charging port 4.
Further, in the present embodiment, the expansion structure 1 includes n slave AC/DC converters 101, n groups of batteries 102, n SOC detection units 103, an expansion controller 104, a DC/DC converter 105, and n normally closed switches Sn1、Sn2、Sn3……Snn；
The n slave AC/DC converters 101 are respectively and correspondingly connected with the n groups of batteries 102 to form n power supply branches;
n normally closed switches Sn1、Sn2、Sn3……SnnCorrespondingly controlling n power supply branches to be simultaneously connected with the switch S1Connecting;
each SOC detection unit 103 correspondingly detects the remaining power of a group of batteries 102, and the battery remaining power signal output end of each SOC detection unit 103 is correspondingly connected with a remaining power signal input end of the expansion controller 104;
the expansion controller 104 is configured to determine whether the remaining power of the battery in the n power supply branches is greater than 90% when receiving the self-charging control signal sent by the main controller 2, and send a self-charging request signal to the main controller 2 when the battery power of at least one power supply branch is less than 90%;
the DC/DC converter 105 is used for performing DC/DC conversion on the electric signals output by the n power supply branches and is connected with the switch S2And supplying power to the electric automobile charging port 4.
N normally closed switches S in the present embodimentn1、Sn2、Sn3……SnnThe expansion structure is used for controlling one or more of the n power supply branches to be connected into the expansion structure, so that batteries can be conveniently replaced, meanwhile, the batteries in the n power supply branches are all realized by waste batteries, the reutilization of the waste batteries is effectively realized, the economy of a power supply station is improved, and energy is saved.
This embodiment electric automobile charging system of different charge modes be used for charging the electric automobile of different power demands, electric automobile's power demand can set up demand power setting module at electric automobile charging port and also can directly set up through devices such as keyboard or human-computer interaction unit according to electric automobile rechargeable battery's charging power, when need not to ask power setting signal, can also detect the demand power of connecting load simultaneously, with the demand power signal transmission who detects to main control unit. According to the invention, the rapid charging of the battery is effectively realized according to the required power of the battery, and the service time of the electric automobile is ensured.
The second embodiment is as follows: in this embodiment, a charging method for electric vehicle charging systems with different charging modes is implemented based on an electric vehicle charging system with different charging modes in the first embodiment, and the method includes:
a power grid independent power supply mode; when the rated output power of the main AC/DC converter 3 meets the power requirement of the electric automobile, the switch S is controlled3Closing; the power grid independently supplies power to the charging port 4 of the electric automobile;
the power grid and the extended structure 1 are in a power supply mode at the same time: when the charging demand power of the electric automobile is larger than the rated output power of the main AC/DC converter 3, the switch S is controlled2And S3And closing the power grid and the expansion structure 1 to supply power to the charging port 4 of the electric automobile at the same time.
Further, in the present embodiment, the present invention further includes: self-charging mode: when the charging port of the electric automobile has no power supply requirement, judging whether the residual electric quantity of each group of battery packs in the expansion structure 1 is 100%; when the residual capacity of any group of battery packs is lower than 100 percent, the switch S is controlled1Closed, when the residual capacity of all the battery packs in the extension structure 1 reaches 100%, the switch S is controlled1And (5) disconnecting to finish self-charging.
The charging of the battery of the electric vehicle described in this embodiment includes four modes, first, when it is detected that the charging port of the electric vehicle is not connected, the battery in the expansion structure is charged, before charging, an SOC detection unit (remaining power detection) is used to detect whether the power of the n groups of battery packs is full, when the battery packs of the power supply branch are not full, the expansion structure is charged until all the battery packs in the expansion structure are full, the charging of the expansion structure is stopped, when the electric vehicle is charged, it is determined whether the required power of the electric vehicle is greater than the output power of the DC/DC converter, if so, the power grid and the expansion structure are controlled to simultaneously supply power to the power supply port of the electric vehicle, otherwise, the power grid alone supplies power to the power supply port of the electric vehicle. When the power grid independently supplies power to the power supply port of the electric automobile, whether the required power of the battery pack is smaller than the rated output power of the main AC/DC converter 3 can be judged, and when the required power of the battery pack is smaller than the rated output power of the main AC/DC converter 3, the power grid is controlled to supply power to the charging port of the electric automobile and charge the expansion structure.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (3)

1. The electric vehicle charging system with multiple charging modes is characterized by comprising an expansion structure (1), a main controller (2), a main AC/DC converter (3), an electric vehicle charging port (4) and three switches S1、S2And S3；
The electric automobile charging port (4) is used for providing a charging port for an electric automobile battery, collecting or setting required power for charging the electric automobile, and sending the collected or set required power for charging the electric automobile battery to the main controller (2);
the charging port (4) of the electric automobile is also provided with a load detection end, and when no load connection is detected, a load disconnection signal is sent to the main controller (2);
the main controller (2) is used for receiving a required power signal of electric vehicle battery charging sent by the electric vehicle charging port (4), judging whether the electric vehicle battery charging needs to be expanded or not according to the required power of the electric vehicle battery charging and the rated power of the main AC/DC converter (3), and if so, controlling the switch S2And S3Closing the power grid and the expansion structure (1) to supply power to the charging port (4) of the electric automobile at the same time, otherwise, controlling the switch S3Closing the charging port to enable the power grid to supply power to the charging port (4) of the electric automobile;
the main controller (2) sends a load disconnection signal to the extension structure (1)) Sending a self-charging control signal; and controls the switch S when receiving the self-charging request signal sent by the extension structure (1)1Closing;
the expansion structure (1) comprises n power supply branches, wherein the n power supply branches are used for a switch S2When the charging port is closed, the charging port (4) of the electric automobile is powered; the power supply system is also used for judging whether the n power supply branches need to be charged or not according to the self-charging control signal sent by the main controller (2), and sending a self-charging request signal to the main controller (2) when at least one power supply branch needs to be charged;
the main AC/DC converter (3) is used for carrying out AC/DC conversion on the electric signal output by the power grid and outputting the converted signal to the electric vehicle charging port (4);
the expansion structure (1) comprises n slave AC/DC converters (101), n groups of batteries (102), n SOC detection units (103), an expansion controller (104), a DC/DC converter (105) and n normally closed switches Sn1、Sn2、Sn3……Snn；
The n slave AC/DC converters (101) are respectively and correspondingly connected with the n groups of batteries (102) to form n power supply branches;
n normally closed switches Sn1、Sn2、Sn3……SnnCorrespondingly controlling n power supply branches to be simultaneously connected with the switch S1Connecting;
each SOC detection unit (103) correspondingly detects the residual capacity of a group of batteries (102), and the battery residual capacity signal output end of each SOC detection unit (103) is correspondingly connected with one residual capacity signal input end of the expansion controller (104);
the expansion controller (104) is used for judging whether the residual electric quantity of the batteries in the n power supply branches is greater than 90% or not when receiving the self-charging control signal sent by the main controller (2), and sending a self-charging request signal to the main controller (2) when the electric quantity of the battery of at least one power supply branch is less than 90%;
a DC/DC converter (105) for DC/DC converting the electrical signals output by the n power supply branches and for switching them via a switch S2Is an electric automobileThe charging port (4) supplies power.
2. An electric vehicle charging method with a plurality of charging modes, which is implemented based on the electric vehicle charging system with a plurality of charging modes of claim 1, and is characterized in that the method comprises the following steps:
a power grid independent power supply mode; when the rated output power of the main AC/DC converter (3) meets the power demand of the electric automobile, the switch S is controlled3Closing; the power grid independently supplies power to the charging port (4) of the electric automobile;
the power grid and the extended structure (1) are in a power supply mode at the same time: when the charging demand power of the electric automobile is larger than the rated output power of the main AC/DC converter (3), the switch S is controlled2And S3And closing the power grid and the expansion structure (1) to supply power to the charging port (4) of the electric automobile at the same time.
3. The method of claim 2, further comprising a self-charging mode, wherein the self-charging mode: when the charging port of the electric automobile has no power supply requirement, judging whether the residual electric quantity of each group of battery pack in the expansion structure (1) is 90%; when the residual capacity of any group of battery packs is lower than 90%, the switch S is controlled1Closed, when the residual capacity of all the battery packs in the expansion structure (1) reaches 100 percent, the switch S is controlled1And (5) disconnecting to finish self-charging.
CN201910805104.2A 2019-08-28 2019-08-28 Electric automobile charging system with multiple charging modes and charging method Expired - Fee Related CN110497808B (en)

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