CN112937324A - Control method of vehicle-mounted bidirectional charger, battery management system and electric vehicle - Google Patents

Control method of vehicle-mounted bidirectional charger, battery management system and electric vehicle Download PDF

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Publication number
CN112937324A
CN112937324A CN201911269345.6A CN201911269345A CN112937324A CN 112937324 A CN112937324 A CN 112937324A CN 201911269345 A CN201911269345 A CN 201911269345A CN 112937324 A CN112937324 A CN 112937324A
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CN
China
Prior art keywords
vehicle
gun head
charging
discharging
bidirectional charger
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Pending
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CN201911269345.6A
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Chinese (zh)
Inventor
李晓鹏
陈彦雷
黄维
姜炜
孙西亮
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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Priority to CN201911269345.6A priority Critical patent/CN112937324A/en
Publication of CN112937324A publication Critical patent/CN112937324A/en
Pending legal-status Critical Current

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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
    • 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
    • B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging 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
    • 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
    • B60L53/20—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 converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • 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

Abstract

The application provides a control method and device of a vehicle-mounted bidirectional charger and an electric vehicle. The method is applied to a battery management system BMS and comprises the following steps: determining that the resistance value of a circuit connected with the charging and discharging muzzle is a first preset value according to the CC signal, and determining that the gun head is a charging gun head when the voltage value of a CP signal on the circuit connected with the charging and discharging muzzle is in a connection stage or a vehicle charging stage; determining that the resistance value of a circuit connected with the charging and discharging gun mouth is a second preset value and the voltage value of the CP signal is zero according to the CC signal, and determining that the gun head is an external discharging gun head; determining that the resistance value of a circuit connected with the charging and discharging gun port is a first preset value according to the CC signal, and determining that the voltage value of the CP signal is zero, and determining that the gun head is a vehicle-to-vehicle discharging gun head; and controlling the corresponding working mode of starting the vehicle-mounted bidirectional charger by combining the type of the gun head and the working state of the vehicle. By using the method, the stability and the safety of the vehicle in the charging and discharging process are improved, and the user operation is simplified.

Description

Control method of vehicle-mounted bidirectional charger, battery management system and electric vehicle
Technical Field
The application relates to the technical field of vehicle-mounted bidirectional chargers, in particular to a control method of a vehicle-mounted bidirectional charger, a battery management system and an electric automobile.
Background
With the shortage of energy and the aggravation of environmental pollution in modern society, electric vehicles have been widely paid attention to as new energy vehicles once they are launched. The electric automobile is a vehicle which uses a power supply provided by a vehicle-mounted power battery as power, drives wheels by using a motor, and meets various requirements of road traffic and safety regulations.
The charge and discharge muzzle of the battery automobile can be a universal muzzle, and can be compatible with three gun heads simultaneously, and the gun heads are respectively: a charging gun head, a V2V (Vehicle to Vehicle) discharging gun head and a V2L (Vehicle to Load) discharging gun head. The three gun heads correspond to three working modes of a vehicle-mounted bidirectional charger, wherein the charging gun head corresponds to an alternating current charging mode, the V2V discharging gun head corresponds to a vehicle-to-vehicle charging mode, and the V2L discharging gun head corresponds to an external power supply mode.
When the user uses the three gun heads, the gun heads are easy to be mistakenly inserted due to misoperation, and the confusion of the BMS (Battery Management System) on the control of the working mode of the vehicle-mounted bidirectional charger can be caused, so that the stability and the safety in the charging and discharging processes are influenced. In addition, when the working mode of the vehicle-mounted bidirectional charger is determined at present, a user needs to operate a button switch to determine the working mode, so that the use of the user is inconvenient.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application provides a control method of a vehicle-mounted bidirectional charger, a battery management system and an electric vehicle, so that the stability and the safety in the charging and discharging processes are improved, and the user operation is simplified.
The application provides a control method of a vehicle-mounted bidirectional charger, which is applied to a Battery Management System (BMS), and comprises the following steps:
when the resistance value of the circuit connected with the charging and discharging muzzle is determined to be a first preset value according to the CC signal determined by the connection of the circuit connected with the charging and discharging muzzle, and the voltage value of the CP signal guided by the control of the circuit connected with the charging and discharging muzzle is determined to be in a connection stage or a vehicle charging stage, determining the type of the gun head to be a charging gun head;
when the resistance value of the circuit connected with the charging and discharging gun mouth is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-outside discharging gun head;
when the resistance value of the circuit connected with the charging and discharging gun port is determined to be the first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-vehicle discharging gun head;
and controlling the corresponding working mode of starting the vehicle-mounted bidirectional charger by combining the type of the gun head and the working state of the vehicle.
Optionally, the combination of the type of the gun head and the working state of the vehicle controls the vehicle-mounted bidirectional charger to start a corresponding working mode, which includes:
when the gun head type is determined to be the charging gun head, determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a charging instruction to the vehicle-mounted bidirectional charger;
when the gun head type is determined to be the gun head discharging from the outside of the vehicle, determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a command of discharging from the outside of the vehicle to the vehicle-mounted bidirectional charger;
and when the gun head type is determined to be the vehicle-to-vehicle discharging gun head, determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a vehicle-to-vehicle instruction to the vehicle-mounted bidirectional charger.
Optionally, determining the output capacity of this time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply device, and the maximum capacity of the cable includes:
and taking the minimum value of the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable as the output capacity of the time.
Optionally, the combination of the type of the gun head and the working state of the vehicle controls the vehicle-mounted bidirectional charger to start a corresponding working mode, which includes:
when the gun head type is determined to be a charging gun head and the BMS and the vehicle-mounted bidirectional charger enter a charging mode, determining the resistance value of the circuit connected with the charging and discharging gun mouth in real time according to the CC signal and acquiring the voltage value of the CP signal;
when the gun head type is identified as the vehicle-to-outside discharge gun head or the vehicle-to-vehicle discharge gun head, generating an invalid instruction;
and when the generation frequency accumulation of the invalid instruction exceeds a first preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
Optionally, when it is determined that the gun head type is the charging gun head and the BMS and the vehicle-mounted bidirectional charger enter the charging mode, the method further includes:
when at least one fault in the self state, the CC signal and the CP signal is confirmed according to a first preset period, the stop instruction is generated to control the vehicle-mounted bidirectional charger to end the charging mode;
and when the vehicle battery is confirmed to be charged according to a second preset period, generating the stop instruction to control the vehicle-mounted bidirectional charger to finish the charging mode.
Optionally, the combination of the type of the gun head and the working state of the vehicle controls the vehicle-mounted bidirectional charger to start a corresponding working mode, which includes:
when the gun head type is determined to be a vehicle-to-vehicle discharging gun head or a vehicle-to-vehicle discharging gun head, and the BMS and the vehicle-mounted bidirectional charger enter a discharging mode, determining the resistance value of a circuit connected with a charging and discharging gun head according to the CC signal in real time and acquiring the voltage value of the CP signal;
when the type of the gun head is identified as the charging gun head, generating an invalid instruction;
and when the generation frequency accumulation of the invalid instruction exceeds a second preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
Optionally, the combination rifle head type and the operating condition of vehicle control on-vehicle bidirectional charger start the mode that corresponds, still include:
and when the vehicle-mounted bidirectional charger and/or the BMS do not allow the vehicle to enter a working mode corresponding to the charging gun head, recording reasons and informing the vehicle through a Controller Area Network (CAN) bus so that the vehicle CAN give corresponding prompts through instruments or light.
The application also provides a battery management system of on-vehicle bidirectional charging machine, battery management system includes: the device comprises a first confirmation unit, a second confirmation unit, a third confirmation unit and a control unit;
the first confirming unit is used for confirming that the gun head type is the charging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be a first preset value according to the CC signal of the connection confirmation on the circuit connected with the charging and discharging gun head and the voltage value of the control guide CP signal on the circuit connected with the charging and discharging gun head is determined to be in the connection stage or the vehicle charging stage;
the second confirming unit is used for confirming that the gun head type is the vehicle-to-outside discharging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero;
the third confirming unit is used for confirming that the gun head type is the vehicle-to-vehicle discharging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be the first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero;
and the control unit is used for controlling the vehicle-mounted bidirectional charger to start a corresponding working mode by combining the type of the gun head and the working state of the vehicle.
Optionally, the control unit includes: the system comprises a first instruction sending unit, a second instruction sending unit and a third instruction sending unit;
the first instruction sending unit is used for determining the output capacity of the vehicle-mounted bidirectional charger according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the charging gun head, and sending a charging instruction to the vehicle-mounted bidirectional charger;
the second instruction sending unit is used for determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the gun head discharging from the outside of the vehicle, and sending a command of discharging from the outside of the vehicle to the vehicle-mounted bidirectional charger;
and the third instruction sending unit is used for determining the output capacity of the time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the vehicle-to-vehicle discharging gun head, and sending a vehicle-to-vehicle instruction to the vehicle-mounted bidirectional charger.
The application also provides an electric automobile, which comprises the battery management system.
Compared with the prior art, the method has at least the following advantages:
the application provides a control method of a vehicle-mounted bidirectional charger, which is applied to a battery management system BMS, and when the resistance value of a circuit connected with a charging and discharging muzzle is determined to be a first preset value according to a connection confirmation CC signal on the circuit connected with the charging and discharging muzzle and the voltage value of a control guide CP signal on the circuit connected with the charging and discharging muzzle is determined to be in a connection stage or a vehicle charging stage, the type of a gun head is determined to be a charging gun head; when the resistance value of a circuit connected with the charging and discharging gun mouth is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-outside discharging gun head; when the resistance value of a circuit connected with the charging and discharging gun port is determined to be a first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-vehicle discharging gun head; and controlling the corresponding working mode of starting the vehicle-mounted bidirectional charger by combining the type of the gun head and the working state of the vehicle. Therefore, the method can identify different types of gun heads through the BMS, and improves the stability and safety in the charging and discharging processes. In addition, the recognition process of the BMS is automatically carried out, an external button is not needed for confirming the working state, external manual intervention is not needed, and user operation is simplified.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a control method of a vehicle-mounted bidirectional charger according to a first embodiment of the present application;
fig. 2 is a schematic view of a charging and discharging system of an electric vehicle according to an embodiment of the present application;
fig. 3 is a schematic diagram of a battery management system of a vehicle-mounted bidirectional charger according to a second embodiment of the present application;
fig. 4 is a schematic view of an electric vehicle according to a third embodiment of the present application.
Detailed Description
At present, a charging and discharging gun port of a battery automobile can be a universal gun port and can be compatible with a charging gun head, a V2V discharging gun head and a V2L discharging gun head at the same time. The three gun heads correspond to three working modes of a vehicle-mounted bidirectional charger, wherein the charging gun head corresponds to an alternating current charging mode, the V2V discharging gun head corresponds to a vehicle-to-vehicle charging mode, and the V2L discharging gun head corresponds to an external power supply mode.
When the user uses the three gun heads, the gun heads are easy to be mistakenly inserted due to misoperation, the control of the BMS on the working mode of the vehicle-mounted bidirectional charger is disordered, and the stability and the safety in the charging and discharging processes are further influenced. In addition, when the working mode of the vehicle-mounted bidirectional charger is determined at present, a user needs to operate a button switch to determine the working mode, so that the use of the user is inconvenient.
In order to solve the technical problem, the application provides a control method of a vehicle-mounted bidirectional charger, a battery management system and an electric automobile, and the gun heads of different types can be identified through a BMS (battery management system), so that the stability and the safety in the charging and discharging processes are improved. In addition, the recognition process of the BMS is automatically carried out, an external button is not needed for confirming the working state, external manual intervention is not needed, and user operation is simplified.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The first embodiment is as follows:
the first embodiment of the present application provides a control method for a vehicle-mounted bidirectional charger, and the following detailed description is made with reference to the accompanying drawings, where it is understood that the terms "first", "second", and the like in the embodiments of the present application are only for convenience of description, and do not form a limitation to the present application.
Referring to fig. 1, the figure is a flowchart of a control method of a vehicle-mounted bidirectional charger according to an embodiment of the present application.
The method provided by the embodiment of the application comprises the following steps:
s101, when the resistance value of a circuit connected with the charging and discharging muzzle is determined to be a first preset value according to a CC signal confirmed by connection on the circuit connected with the charging and discharging muzzle, and the voltage value of a CP signal guided by control on the circuit connected with the charging and discharging muzzle is determined to be in a connection stage or a vehicle charging stage, the type of the gun head is determined to be a charging gun head.
Next, the charge/discharge system of the electric vehicle will be described first.
Referring to fig. 2, the figure is a schematic view of a charging and discharging system of an electric vehicle according to a first embodiment of the present application.
Electric automobile includes BMS201 and on-vehicle bidirectional charging machine 202, and the function that the charge-discharge interface of vehicle corresponds is respectively:
firstly, a single-phase alternating current power supply/a three-phase alternating current power supply; a three-phase alternating current power supply; three-phase AC power supply; fourthly, single-phase neutral line/three-phase neutral line; protecting the grounding (PE), and connecting the ground wire of the power supply equipment with the vehicle electric platform; sixthly, CC (connection confirm) signal; a CP (control pilot) signal.
The electric automobile's charge and discharge interface can be connected with the charge and discharge rifle mouth, and when charge and discharge interface and charging rifle were connected, electric automobile was in the mode of charging, fills electric pile and charges to electric automobile's power battery through on-vehicle bidirectional charging machine 202.
When the charging and discharging interface is connected with the vehicle-to-vehicle discharging gun head, the electric vehicle is in a discharging mode, and a power battery of the electric vehicle discharges to other vehicles through the vehicle-mounted bidirectional charger 202.
When the charging and discharging interface is connected with the external discharging gun head of the vehicle, the electric vehicle is in a discharging mode, and a power battery of the electric vehicle discharges to an external load through the vehicle-mounted bidirectional charger 202.
The BMS of the electric automobile determines that the resistance value of a circuit resistor connected with the charging and discharging muzzle is a first preset value by detecting a CC signal on a circuit connected with the charging and discharging muzzle in real time, and determines that the gun head type is a charging gun when the voltage value of a CP signal is detected to be in a vehicle connection stage or a vehicle charging stage.
And S102, when the resistance value of a circuit connected with the charging and discharging gun mouth is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-outside discharging gun head.
S103, when the resistance value of a circuit connected with the charging and discharging gun port is determined to be a first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, the gun head type is determined to be the vehicle-to-vehicle discharging gun head.
BMS can detect the resistance of the circuit connected with the charging and discharging muzzle (i.e. the resistance between the detecting point A and the interface fifthly)
When the vehicle is in the charging mode, S3 is in a closed state, and the resistance value of the circuit connected to the charging and discharging muzzle is a first preset value, where the first and preset values are RC.
When the vehicle is in the discharging mode and the gun head type is the gun head discharging from outside of the vehicle, S3 is in a disconnected state, the resistance value of the circuit connected with the charging and discharging gun mouth is a second preset value, and the second and preset values are RC + R4.
When the vehicle is in a discharging mode and the gun head type is the vehicle-to-vehicle discharging gun head, S3 is in a closed state, and the resistance value of a circuit connected with the charging and discharging gun head is RC.
BMS201 of the electric vehicle is also used to detect the state of the CP signal (detection point B).
When charging is finished or stopped under normal conditions, the charging pile is used for initiating and informing the vehicle that charging is finished. When the vehicle determines that the charging is completed, the control S2 is turned off, and the BMS detects that the voltage value bar of the CP signal becomes zero.
Further, when the on-board bidirectional charger of the vehicle is operated in the discharging mode, the switch S2 is kept open, and the voltage value of the CP signal detected by the BMS is zero.
S104: and controlling the corresponding working mode of starting the vehicle-mounted bidirectional charger by combining the type of the gun head and the working state of the vehicle.
The BMS control method is specifically explained as follows:
and when the BMS confirms that the gun head type is the charging gun head, determining the output capacity of the time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a charging instruction to the vehicle-mounted bidirectional charger.
When the BMS confirms that the gun head type is the gun head for external discharging of the vehicle, determining the output capacity of the vehicle-mounted bidirectional charger according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending an external discharging instruction of the vehicle to the vehicle-mounted bidirectional charger;
and when the BMS confirms that the gun head type is the vehicle-to-vehicle discharging gun head, determining the output capacity according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a vehicle-to-vehicle instruction to the vehicle-mounted bidirectional charger.
Furthermore, the BMS can also take the minimum value of the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable as the output capacity at this time, so that the condition that the load is overlarge in the working process of the vehicle-mounted double-wire charger is avoided, and the safety is improved.
Utilize the control method of on-vehicle bidirectional charging machine that this application provided, can discern the rifle head of different grade type through BMS, promoted stability and security among charging and the discharge process. In addition, the recognition process of the BMS is automatically carried out, an external button is not needed for confirming the working state, external manual intervention is not needed, and user operation is simplified.
Further, as the charging gun head and the vehicle-to-vehicle discharging gun head have the same corresponding first preset value, in order to prevent gun type identification errors in the identification process caused by interference of the BMS or poor contact between the gun head and the gun seat, the method further comprises the following steps:
and when the BMS confirms that the gun head type is the charging gun head and the BMS and the vehicle-mounted bidirectional charger enter a charging mode, determining the resistance value of a circuit connected with the charging and discharging gun mouth in real time according to the CC signal and acquiring the voltage value of the CP signal.
And when the BMS identifies that the gun head type is the gun head discharging from the outside of the vehicle or the gun head discharging from the inside of the vehicle, generating an invalid instruction. At this time, the BMS still controls the vehicle-mounted bidirectional charger to continuously work in the charging mode.
And when the generation frequency of the invalid instruction exceeds a first preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
And after the BMS and the charger finish the current working mode, the gun head needs to be plugged again to work.
Meanwhile, in order to prevent the occurrence of misjudgment, the S2 switch is in an off state when the charger works in the discharging mode.
In addition, when the BMS and the vehicle-mounted bidirectional charger enter the charging mode, the BMS checks the self state, the CC signals and the CP signals according to a first preset period, and when the BMS confirms that at least one of the self state, the CC signals and the CP signals has a fault, a stop instruction is generated to control the vehicle-mounted bidirectional charger to finish the charging mode, so that the safety of the vehicle-mounted bidirectional charger in the working process is further improved. The first preset period is set according to an actual situation, and the embodiment of the present application is not particularly limited.
The BMS can also detect the electric quantity of the electric battery of the vehicle according to a second preset period, and when the BMS confirms that the vehicle battery finishes charging, a stop instruction is generated to control the vehicle-mounted bidirectional charger to finish the charging mode. The second preset period is set according to an actual situation, and the embodiment of the present application is not particularly limited. The second predetermined period may be the same as or different from the first predetermined period.
When the BMS confirms that the type of the gun head is an external vehicle discharging gun head or an internal vehicle discharging gun head, and the BMS and the vehicle-mounted bidirectional charger enter a discharging mode, the BMS can also determine the resistance value of a circuit connected with a charging and discharging gun head according to the CC signal in real time and acquire the voltage value of the CP signal;
when the type of the gun head is identified as the charging gun head, generating an invalid instruction;
and when the generation frequency of the invalid instruction exceeds a second preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
In addition, when the vehicle-mounted bidirectional charger does not allow the vehicle-mounted bidirectional charger to enter the working mode corresponding to the charging gun head, the vehicle-mounted bidirectional charger sends a notification instruction to the BMS, the notification instruction CAN carry the reason why the vehicle-mounted bidirectional charger does not allow the vehicle-mounted bidirectional charger to enter the corresponding working mode, and the BMS receives the notification instruction and then notifies the vehicle through a Controller Area Network (CAN) bus so that the vehicle CAN perform corresponding prompting through an instrument or a light.
When the BMS does not allow to enter the working mode corresponding to the charging gun head, the BMS records the reason and informs the vehicle through a Controller Area Network (CAN) bus so that the vehicle CAN correspondingly prompt through an instrument or a light.
By means of the method, when the BMS is interfered, for example, the CP signal state is abnormal in the charging and discharging process, or the CP signal state is abnormal, the situation that the type of the gun head is mistakenly considered to be changed and further the control of the working mode of the vehicle-mounted bidirectional charger is disordered is avoided, when an invalid instruction reaches a certain number of times, the BMS controls the vehicle-mounted bidirectional charger to end the current working mode, and the control strategy can improve the stability and the safety of the vehicle in the charging and discharging process.
Example two:
based on the control method of the vehicle-mounted bidirectional charger provided by the embodiment, the second embodiment of the application further provides a battery management system of the vehicle-mounted bidirectional charger, which is specifically described below with reference to the accompanying drawings.
Referring to fig. 3, the figure is a schematic view of a battery management system of a vehicle-mounted bidirectional charger according to a second embodiment of the present application.
The battery management system that this application embodiment provided includes: a first validation unit 301, a second validation unit 302, a third validation unit 303 and a control unit 304.
The first confirming unit 301 is configured to confirm that the gun head type is the charging gun head when it is determined that the resistance value of the circuit connected to the charging and discharging gun head is the first preset value according to the connection confirmation CC signal on the circuit connected to the charging and discharging gun head and it is determined that the voltage value of the control pilot CP signal on the circuit connected to the charging and discharging gun head is in the connection stage or the vehicle charging stage.
And a second confirming unit 302, configured to confirm that the gun head type is the external discharging gun head when it is determined that the resistance value of the circuit connected to the charging and discharging gun head is the second preset value according to the CC signal and it is determined that the voltage value of the CP signal is zero.
And a third confirming unit 303, configured to confirm that the gun head type is the vehicle-to-vehicle discharging gun head when it is determined that the resistance value of the circuit connected to the charging and discharging gun head is the first preset value according to the CC signal and it is determined that the voltage value of the CP signal is zero.
And the control unit 304 is used for controlling the corresponding working mode of the vehicle-mounted bidirectional charger to be started by combining the type of the gun head and the working state of the vehicle.
Further, the control unit 304 further includes a first instruction sending unit, a second instruction sending unit, and a third instruction sending unit.
And the first instruction sending unit is used for determining the output capacity of the time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the charging gun head, and sending a charging instruction to the vehicle-mounted bidirectional charger.
And the second instruction sending unit is used for determining the output capacity according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the gun head for discharging the vehicle to the outside, and sending a command for discharging the vehicle to the outside to the vehicle-mounted bidirectional charger.
And the third instruction sending unit is used for determining the output capacity according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the vehicle-to-vehicle discharging gun head, and sending a vehicle-to-vehicle instruction to the vehicle-mounted bidirectional charger.
Further, control unit 304 sets the minimum value of the maximum output capacity of the in-vehicle bidirectional charger, the output capacity of the power supply device, and the maximum capacity of the cable as the current output capacity.
The control unit 304 is further configured to determine a resistance value of a circuit connected with the charging and discharging muzzle according to the CC signal in real time and obtain a voltage value of the CP signal when the type of the muzzle is determined to be the charging muzzle and the BMS and the vehicle-mounted bidirectional charger enter the charging mode; when the gun head type is identified as a vehicle-to-outside discharge gun head or a vehicle-to-vehicle discharge gun head, generating an invalid instruction; and when the generation frequency of the invalid instruction exceeds a first preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
The control unit 304 is further configured to generate a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode when at least one of the self state, the CC signal and the CP signal is determined to be faulty according to a first preset period; and when the vehicle battery is confirmed to finish charging according to a second preset period, generating a stop instruction to control the vehicle-mounted bidirectional charger to finish the charging mode.
The first preset period and the second preset period are set according to actual conditions, and embodiments of the present application are not specifically limited. The first preset period and the second preset period may be the same or different.
Further, the control unit 304 is further configured to determine, according to the CC signal, a resistance value of a circuit connected to the charging and discharging gun port in real time and obtain a voltage value of the CP signal when it is determined that the gun port type is the vehicle-to-vehicle discharging gun port or the vehicle-to-vehicle discharging gun port, and the BMS and the vehicle-mounted bidirectional charger enter a discharging mode; when the gun head type is identified as a charging gun head, generating an invalid instruction; and when the generation frequency of the invalid instruction exceeds a second preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
Further, the control unit 304 is further configured to record the reason and notify the vehicle through the controller area network CAN bus when the vehicle-mounted bidirectional charger and/or BMS does not allow to enter the working mode corresponding to the charging gun head, so that the vehicle CAN give a corresponding prompt through an instrument or a light.
The first confirming unit of the battery management system BMS provided in the embodiment of the application confirms that the gun head type is the charging gun head when determining that the resistance value of the circuit connected to the charging and discharging gun head is the first preset value according to the connection confirmation CC signal on the circuit connected to the charging and discharging gun head and determining that the voltage value of the control guidance CP signal on the circuit connected to the charging and discharging gun head is in the connection phase or the vehicle charging phase; when the resistance value of a circuit connected with the charging and discharging gun mouth is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, the second confirmation unit confirms that the gun head type is the vehicle-to-outside discharging gun head; when the resistance value of a circuit connected with the charging and discharging gun mouth is determined to be a first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, the third confirming unit confirms that the gun head type is the vehicle-to-vehicle discharging gun head; the control unit controls the corresponding working mode of the vehicle-mounted bidirectional charger to be started by combining the type of the gun head and the working state of the vehicle. Therefore, the BMS can identify different types of gun heads, and stability and safety in the charging and discharging process are improved. In addition, the recognition process of the BMS is automatically carried out, an external button is not needed for confirming the working state, external manual intervention is not needed, and user operation is simplified.
Example three:
based on the battery management system of the vehicle-mounted bidirectional charger provided by the embodiment, a third embodiment of the application further provides an electric vehicle, which is specifically described below with reference to the accompanying drawings.
Referring to fig. 4, the figure is a schematic view of an electric vehicle according to a third embodiment of the present application.
The electric vehicle 400 includes: battery management system BMS 401.
The battery management system BMS401 includes: the device comprises a first confirming unit, a second confirming unit, a third confirming unit and a control unit.
And the first confirmation unit is used for confirming that the gun head type is the charging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be a first preset value according to the CC signal connected with the circuit connected with the charging and discharging gun head and the voltage value of the control guide CP signal on the circuit connected with the charging and discharging gun head is determined to be in a connection stage or a vehicle charging stage.
And the second confirming unit is used for confirming that the gun head type is the vehicle-to-outside discharging gun head when the resistance value of a circuit connected with the charging and discharging gun head is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero.
And the third confirming unit is used for confirming that the gun head type is the vehicle-to-vehicle discharging gun head when the resistance value of a circuit connected with the charging and discharging gun head is determined to be the first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero.
And the control unit is used for controlling the vehicle-mounted bidirectional charger to start a corresponding working mode by combining the type of the gun head and the working state of the vehicle.
For the description of BMS401, reference may be made to the description of the second embodiment above, and this embodiment is not described herein again.
The battery management system BMS of the electric automobile provided by the embodiment of the application comprises a first confirming unit, wherein when the resistance value of a circuit connected with a charging and discharging muzzle is determined to be a first preset value according to a connection confirmation CC signal on the circuit connected with the charging and discharging muzzle, and the voltage value of a control guide CP signal on the circuit connected with the charging and discharging muzzle is determined to be in a connection stage or a vehicle charging stage, the gun head type is determined to be a charging gun head; when the resistance value of a circuit connected with the charging and discharging gun mouth is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, the second confirmation unit confirms that the gun head type is the vehicle-to-outside discharging gun head; when the resistance value of a circuit connected with the charging and discharging gun mouth is determined to be a first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, the third confirming unit confirms that the gun head type is the vehicle-to-vehicle discharging gun head; the control unit controls the corresponding working mode of the vehicle-mounted bidirectional charger to be started by combining the type of the gun head and the working state of the vehicle.
This BMS can discern the rifle head of different grade type, has promoted stability and security in the charging and discharging process. In addition, the recognition process of the BMS is automatically carried out, an external button is not needed for confirming the working state, external manual intervention is not needed, and user operation is simplified.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (10)

1. A control method of a vehicle-mounted bidirectional charger is applied to a Battery Management System (BMS), and comprises the following steps:
when the resistance value of the circuit connected with the charging and discharging muzzle is determined to be a first preset value according to the CC signal determined by the connection of the circuit connected with the charging and discharging muzzle, and the voltage value of the CP signal guided by the control of the circuit connected with the charging and discharging muzzle is determined to be in a connection stage or a vehicle charging stage, determining the type of the gun head to be a charging gun head;
when the resistance value of the circuit connected with the charging and discharging gun mouth is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-outside discharging gun head;
when the resistance value of the circuit connected with the charging and discharging gun port is determined to be the first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero, determining that the gun head type is the vehicle-to-vehicle discharging gun head;
and controlling the corresponding working mode of starting the vehicle-mounted bidirectional charger by combining the type of the gun head and the working state of the vehicle.
2. The control method according to claim 1, wherein the step of controlling the corresponding working mode of the vehicle-mounted bidirectional charger to start in combination with the type of the gun head and the working state of the vehicle comprises the following steps:
when the gun head type is determined to be the charging gun head, determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a charging instruction to the vehicle-mounted bidirectional charger;
when the gun head type is determined to be the gun head discharging from the outside of the vehicle, determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a command of discharging from the outside of the vehicle to the vehicle-mounted bidirectional charger;
and when the gun head type is determined to be the vehicle-to-vehicle discharging gun head, determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable, and sending a vehicle-to-vehicle instruction to the vehicle-mounted bidirectional charger.
3. The control method according to claim 2, wherein the determining the current output capacity according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable comprises:
and taking the minimum value of the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable as the output capacity of the time.
4. The control method according to claim 1, wherein the step of controlling the corresponding working mode of the vehicle-mounted bidirectional charger to start in combination with the type of the gun head and the working state of the vehicle comprises the following steps:
when the gun head type is determined to be a charging gun head and the BMS and the vehicle-mounted bidirectional charger enter a charging mode, determining the resistance value of the circuit connected with the charging and discharging gun mouth in real time according to the CC signal and acquiring the voltage value of the CP signal;
when the gun head type is identified as the vehicle-to-outside discharge gun head or the vehicle-to-vehicle discharge gun head, generating an invalid instruction;
and when the generation frequency accumulation of the invalid instruction exceeds a first preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
5. The control method according to claim 4, wherein when it is confirmed that the type of the lance tip is the charging lance tip and the BMS and the on-board bidirectional charger enter the charging mode, the method further comprises:
when at least one fault in the self state, the CC signal and the CP signal is confirmed according to a first preset period, the stop instruction is generated to control the vehicle-mounted bidirectional charger to end the charging mode;
and when the vehicle battery is confirmed to be charged according to a second preset period, generating the stop instruction to control the vehicle-mounted bidirectional charger to finish the charging mode.
6. The control method according to claim 1, wherein the step of controlling the corresponding working mode of the vehicle-mounted bidirectional charger to start in combination with the type of the gun head and the working state of the vehicle comprises the following steps:
when the gun head type is determined to be a vehicle-to-vehicle discharging gun head or a vehicle-to-vehicle discharging gun head, and the BMS and the vehicle-mounted bidirectional charger enter a discharging mode, determining the resistance value of a circuit connected with a charging and discharging gun head according to the CC signal in real time and acquiring the voltage value of the CP signal;
when the type of the gun head is identified as the charging gun head, generating an invalid instruction;
and when the generation frequency accumulation of the invalid instruction exceeds a second preset frequency, generating a stop instruction to control the vehicle-mounted bidirectional charger to end the charging mode.
7. The control method according to any one of claims 2 to 6, wherein the control of the corresponding working mode of the start-up of the vehicle-mounted bidirectional charger in combination with the type of the lance head and the working state of the vehicle further comprises:
and when the vehicle-mounted bidirectional charger and/or the BMS do not allow the vehicle to enter a working mode corresponding to the charging gun head, recording reasons and informing the vehicle through a Controller Area Network (CAN) bus so that the vehicle CAN give corresponding prompts through instruments or light.
8. The utility model provides a battery management system of on-vehicle bidirectional charging machine which characterized in that, battery management system includes: the device comprises a first confirmation unit, a second confirmation unit, a third confirmation unit and a control unit;
the first confirming unit is used for confirming that the gun head type is the charging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be a first preset value according to the CC signal of the connection confirmation on the circuit connected with the charging and discharging gun head and the voltage value of the control guide CP signal on the circuit connected with the charging and discharging gun head is determined to be in the connection stage or the vehicle charging stage;
the second confirming unit is used for confirming that the gun head type is the vehicle-to-outside discharging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be a second preset value according to the CC signal and the voltage value of the CP signal is determined to be zero;
the third confirming unit is used for confirming that the gun head type is the vehicle-to-vehicle discharging gun head when the resistance value of the circuit connected with the charging and discharging gun head is determined to be the first preset value according to the CC signal and the voltage value of the CP signal is determined to be zero;
and the control unit is used for controlling the vehicle-mounted bidirectional charger to start a corresponding working mode by combining the type of the gun head and the working state of the vehicle.
9. The battery management system according to claim 8, wherein the control unit comprises: the system comprises a first instruction sending unit, a second instruction sending unit and a third instruction sending unit;
the first instruction sending unit is used for determining the output capacity of the vehicle-mounted bidirectional charger according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the charging gun head, and sending a charging instruction to the vehicle-mounted bidirectional charger;
the second instruction sending unit is used for determining the output capacity of the current time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the gun head discharging from the outside of the vehicle, and sending a command of discharging from the outside of the vehicle to the vehicle-mounted bidirectional charger;
and the third instruction sending unit is used for determining the output capacity of the time according to the maximum output capacity of the vehicle-mounted bidirectional charger, the output capacity of the power supply equipment and the maximum capacity of the cable when the gun head type is determined to be the vehicle-to-vehicle discharging gun head, and sending a vehicle-to-vehicle instruction to the vehicle-mounted bidirectional charger.
10. An electric vehicle, characterized in that the vehicle comprises a battery management system according to any one of claims 8-9.
CN201911269345.6A 2019-12-11 2019-12-11 Control method of vehicle-mounted bidirectional charger, battery management system and electric vehicle Pending CN112937324A (en)

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