CN109677297B - Uninterrupted alternating current charging control method for pure electric vehicle and electric vehicle - Google Patents

Uninterrupted alternating current charging control method for pure electric vehicle and electric vehicle Download PDF

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Publication number
CN109677297B
CN109677297B CN201811603096.5A CN201811603096A CN109677297B CN 109677297 B CN109677297 B CN 109677297B CN 201811603096 A CN201811603096 A CN 201811603096A CN 109677297 B CN109677297 B CN 109677297B
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charging
vehicle
battery pack
battery
charger
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CN109677297A (en
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郭濮瑞
吴畏
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Aiways Automobile Shanghai Co Ltd
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Aiways Automobile Shanghai Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10Methods 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
    • B60L53/14Conductive energy transfer
    • B60L53/16Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22Balancing the charge of battery modules
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/14Plug-in electric vehicles

Abstract

The invention discloses an uninterrupted alternating current charging control method for a pure electric vehicle and the electric vehicle, wherein the uninterrupted alternating current charging control method for the pure electric vehicle comprises the following steps: the vehicle-mounted charger simultaneously awakens the battery management systems in the plurality of battery packs connected in parallel on the bus; the vehicle control unit reads the state information of each battery pack from the bus, and judges whether each battery pack meets the charging condition according to the state information of each battery pack; and sequentially charging the battery packs according to the preset charging sequence of the battery packs. According to the invention, an alternating current charging technology is applied to the pure electric vehicle with multiple power sources, and in order to meet user experience, multiple power battery packs are sequentially subjected to alternating current charging under the condition of not plugging and unplugging a charging gun again through signal interaction of an OBC (on-board charger), a VCU (vehicle control unit) and a BMS (battery management system) of each battery pack in the charging process.

Description

Uninterrupted alternating current charging control method for pure electric vehicle and electric vehicle
Technical Field
The invention relates to the technical field of electric vehicles, in particular to the technical field of pure electric vehicle charging, and specifically relates to an uninterrupted alternating current charging control method for a pure electric vehicle and an electric vehicle.
Background
The electric vehicle (BEV) is a vehicle which takes a vehicle-mounted power supply as power and drives wheels by a motor, and meets various requirements of road traffic and safety regulations. The automobile has a small influence on the environment, so that the prospect is widely seen, but the current technology is not mature. The working principle is as follows: battery-current-power regulator-motor-driveline-drive vehicle travel (Road).
The pure electric vehicle is a vehicle driven by a motor. Compared with a fuel automobile, the main difference of the pure electric automobile is four parts, namely a driving motor, a speed regulation controller, a power battery and a vehicle-mounted charger. Compared with a gas station, the system is provided with a public ultrafast charging station. The quality difference of the pure electric vehicle depends on the four large components, and the value of the pure electric vehicle also depends on the quality of the four large components. The application of the pure electric vehicle is directly related to the selection and the configuration of the four major components.
The speed per hour and the starting speed of the pure electric vehicle depend on the power and the performance of a driving motor, the length of the continuous mileage of the pure electric vehicle depends on the capacity of a vehicle-mounted power battery, the weight of the vehicle-mounted power battery depends on which power battery is selected, such as lead-acid, zinc carbon, lithium batteries and the like, and the volume, the specific gravity, the specific power, the specific energy and the cycle life of the vehicle-mounted power battery are different. Depending on the location and use of the finished vehicle grade by the manufacturer and the market definition, market segment.
The driving motor of the pure electric automobile has a DC brush, a brushless, a permanent magnet and an electromagnetic part, and an AC stepping motor, and the selection of the driving motor is related to the configuration, the application and the grade of the whole automobile. In addition, the speed regulation control of the driving motor is divided into step speed regulation and stepless speed regulation, and the step speed regulation and the stepless speed regulation are divided into an electronic speed regulation controller and a non-speed regulation controller. The motor is provided with a hub motor, an inner rotor motor, a single motor drive, a multi-motor drive, a combined motor drive and the like.
The advantages are that: the technology is relatively simple and mature, and the charging can be carried out in places where power is supplied.
The disadvantages are as follows: the energy stored by the unit weight of the storage battery is too little, and the battery of the electric vehicle is expensive and does not form an economic scale, so the purchase price is expensive, and as for the use cost, some use prices are more expensive than the automobile, and some use prices are only 1/3 of the automobile, which mainly depend on the service life of the battery and the price of local oil and electricity.
At present, in the market, there is no charging control method capable of supporting a multi-pack structure, and in the process of charging a plurality of battery packs, after charging of one battery pack is finished, a charging gun needs to be pulled out, and then inserted to continue to charge the next power battery pack.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an uninterruptible ac charging control method for a pure electric vehicle and an electric vehicle, which are used to solve the problem in the prior art that a charging gun needs to be frequently plugged and unplugged when a plurality of power battery packs are charged.
To achieve the above and other related objects, the present invention provides an uninterruptible ac charging control method for an electric-only vehicle, including: the vehicle-mounted charger simultaneously awakens the battery management systems in the plurality of battery packs connected in parallel on the bus; the vehicle control unit reads the state information of each battery pack from the bus, and judges whether each battery pack meets the charging condition according to the state information of each battery pack; and sequentially charging the battery packs according to the preset charging sequence of the battery packs.
In an embodiment of the present invention, when the charging gun is plugged into the on-board charger, the on-board charger simultaneously wakes up the battery management systems in the plurality of battery packs connected in parallel to the bus.
In an embodiment of the present invention, the method for controlling uninterrupted ac charging of a pure electric vehicle further includes: after a battery management system in a battery pack is awakened, the battery management system detects and acquires state information corresponding to the battery pack and sends the state information of the battery pack to the bus so as to be read by the vehicle control unit.
In an embodiment of the present invention, the method for controlling uninterrupted ac charging of a pure electric vehicle further includes: the battery management system in each battery pack receives a charging permission instruction from the vehicle control unit and sends a power-on request to the vehicle control unit when receiving the charging permission instruction; and the battery management system in each battery pack sends a charging request current and a charging request voltage to the vehicle-mounted charger according to the maximum allowable charging current and voltage sent by the vehicle-mounted charger.
In an embodiment of the present invention, the sequentially charging the battery packs according to the preset charging sequence of the battery packs includes: when the vehicle control unit judges that the battery pack meets the charging condition according to the state information of the battery pack, the vehicle control unit sends the charging permission instruction to the corresponding battery management system according to a preset charging sequence; the battery management system receiving the charging permission instruction sends a charging request instruction to the vehicle-mounted charger; and the battery management system starts pre-charging after receiving the power-on command fed back by the vehicle control.
In an embodiment of the present invention, when the battery pack does not satisfy the charging condition, the charging permission instruction is sent to the corresponding battery management system according to a sequence after the battery pack is skipped in a preset charging sequence.
In an embodiment of the invention, when one of the battery packs is fully charged, the vehicle controller allows the battery management system of the next battery pack meeting the charging condition to send the charging permission instruction when it is determined that the bus voltage tends to 0V and the main relay of the fully charged battery pack is turned off.
In an embodiment of the present invention, the method for controlling uninterrupted ac charging of a pure electric vehicle further includes: detecting whether the pre-charging is successful; when the pre-charging is successful, the battery management system controls the relay of the corresponding battery pack to be closed; the battery management system sends a charging request current and a charging request voltage to the vehicle-mounted charger according to the state of a battery pack, sends a power-on request to the vehicle control unit and continuously sends a charging request instruction to the vehicle-mounted charger; and after receiving the power-on permission instruction fed back by the vehicle control, continuously receiving power supply current from the vehicle-mounted charger to charge the battery pack.
In an embodiment of the present invention, when a power-off command issued by the vehicle controller is not received within a preset time or a power-off command issued by the vehicle controller is received within the preset time, the relay of the battery pack is controlled to be turned off, and charging of the battery pack is stopped.
The embodiment of the invention also provides an electric automobile, which is charged by applying the uninterrupted alternating current charging control method for the pure electric vehicle.
As described above, the uninterruptible ac charging control method for the pure electric vehicle and the electric vehicle according to the present invention have the following advantages:
according to the invention, an alternating current charging technology is applied to the pure electric vehicle with multiple power sources, and in order to meet user experience, multiple power battery packs are sequentially subjected to alternating current charging under the condition of not plugging and unplugging a charging gun again through signal interaction of an OBC (on-board charger), a VCU (vehicle control unit) and a BMS (battery management system) of each battery pack in the charging process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart illustrating an uninterruptible ac charging control method for an electric-only vehicle according to the present invention.
Fig. 2 is a schematic diagram illustrating connection of a battery pack in the uninterruptible ac charging control method for an electric-only vehicle according to the present invention.
Fig. 3 is a schematic diagram illustrating a specific charging interaction flow of the uninterruptible ac charging control method for electric-only vehicles according to the present invention.
Fig. 4 is a schematic diagram illustrating a specific charging interaction flow of the uninterruptible ac charging control method for the electric-only vehicle according to the present invention.
Fig. 5 is a schematic diagram illustrating a procedure of self-checking whether charging is allowed or not for a battery pack according to the uninterruptible ac charging control method for the electric-only vehicle of the present invention.
Fig. 6 is a schematic flow chart illustrating the pre-charging in the uninterruptible ac charging control method for the electric-only vehicle according to the present invention.
Fig. 7 is a schematic diagram illustrating a specific charging interaction flow of the uninterruptible ac charging control method for electric-only vehicles according to the present invention.
Fig. 8 is a schematic overall interaction flow diagram illustrating a specific charging method of the uninterruptible ac charging control method for electric-only vehicles according to the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The embodiment provides an uninterrupted alternating current charging control method for a pure electric vehicle and the electric vehicle, and is used for solving the problem that in the prior art, when a plurality of power battery packs are charged, a charging gun needs to be plugged and pulled frequently.
The following will describe in detail principles and embodiments of an uninterruptible ac charging control method for an electric-only vehicle and an electric vehicle according to the present invention, so that those skilled in the art can understand the uninterruptible ac charging control method for an electric-only vehicle and an electric vehicle without creative efforts.
As shown in fig. 1, the present embodiment provides the method for controlling uninterruptible ac charging for a pure electric vehicle, including:
step S110, the vehicle-mounted charger simultaneously awakens the battery management systems in a plurality of battery packs connected in parallel on the bus;
step S120, the vehicle control unit reads the state information of each battery pack from the bus, and judges whether each battery pack meets the charging condition according to the state information of each battery pack;
step S130, sequentially charging each battery pack according to a preset charging sequence of each battery pack.
As shown in fig. 2, in the present embodiment, an example of a connection relationship between each battery pack and an On Board Charger (OBC) or a Vehicle Control Unit (VCU) is shown.
Each Battery pack is connected in parallel to the bus, each Battery pack has a corresponding Battery Management System (BMS), and the vehicle-mounted charger and the vehicle controller are also connected to the bus. The vehicle-mounted charger is respectively connected with each battery pack, and a Battery Management System (BMS) in each battery pack is awakened simultaneously through an OBC (on board battery) hard line awakening signal.
Wherein the bus is preferably a CAN bus.
The Vehicle Control Unit (VCU) judges whether one or more battery packs meet the charging requirement according to the state information of each battery pack on the bus, and charges the battery pack according to a control strategy, for example, the pack a, the pack B and the pack C according to an agreed charging sequence, and if a certain battery pack does not meet the charging condition, the charging is automatically skipped, and the charging is performed according to the sequence described above. In the charging process, for satisfying user experience, through on-board charger (OBC), Vehicle Control Unit (VCU) and each battery management system (BMS)'s signal interaction, realize not plugging the condition of rifle that charges again, continuously charge for three battery package.
The uninterrupted ac charging control method for the electric-only vehicle according to the present embodiment will be described in detail below.
Specifically, in this embodiment, when the charging gun is inserted into the on-board charger, the on-board charger simultaneously wakes up the battery management systems in the plurality of battery packs connected in parallel to the bus.
In this embodiment, as shown in fig. 3, the method for controlling uninterrupted ac charging for a pure electric vehicle further includes:
and step S111, after a battery management system in the battery pack is awakened, the battery management system detects and acquires state information corresponding to the battery pack and sends the state information of the battery pack to the bus so as to be read by the vehicle control unit.
Step S112, the battery management system in each battery pack receives a charging permission instruction from the vehicle controller, and sends a power-on request to the vehicle controller when receiving the charging permission instruction;
step S113, the battery management system in each battery pack sends a charging request current and a charging request voltage to the vehicle-mounted charger according to the maximum allowable charging current and voltage sent by the vehicle-mounted charger.
As shown in fig. 5, it is assumed that there are three battery packs, a battery pack, B battery pack, and C battery pack. When the charging robbery is inserted, the battery management systems BMSA, BMSB and BMSC corresponding to the battery pack A, the battery pack B and the battery pack C are awakened. And then, the BMSA, the BMSB and the BMSC of the battery management system carry out self-checking, the self-checking is successful, the state information corresponding to the battery pack and the information whether the battery pack allows charging are continuously detected and obtained, and the state information and the information whether the battery pack allows charging are sent to the bus so as to be read by the whole vehicle controller.
Then, as shown in fig. 6, the Vehicle Control Unit (VCU) acquires the state information of the three battery packs, sends a charging enable instruction according to the states of the battery packs, and the battery management system in each battery pack waits for receiving a charging enable instruction from the Vehicle Control Unit (VCU), and continues to send a power-on request to the vehicle control unit when receiving the charging enable instruction.
Before sending a power-on request to the vehicle control unit, confirming whether a level state of a battery pack exists, namely confirming CC (high level) and CP (low level), judging whether the CC (high level) and the CP (low level) are normal after confirming the CC (high level) and the CP (low level), and sending the power-on request to the vehicle control unit when the CC (high level) and the CP (low level) are normal, namely sending a high-voltage request instruction to the vehicle control unit.
In this embodiment, the vehicle-mounted charger sends the maximum allowable charging current and voltage to each battery pack, the battery management system in each battery pack sends the charging request current and the charging request voltage to the vehicle-mounted charger according to the maximum allowable charging current and voltage sent by the vehicle-mounted charger, then waits for receiving a power-on instruction fed back by a Vehicle Control Unit (VCU), namely feeds back a high-voltage instruction, and determines whether to continue a subsequent charging process according to whether the power-on instruction is received, if the power-on instruction fed back by the Vehicle Control Unit (VCU) is not received within a preset time, the power-on instruction is determined to be overtime, and the overtime fault is reported to the battery management system.
In this embodiment, as shown in fig. 4, the sequentially charging the battery packs according to the preset charging sequence of the battery packs includes:
and step S114, when the vehicle control unit judges that the battery pack meets the charging condition according to the state information of the battery pack, the vehicle control unit sends the charging permission instruction to the corresponding battery management system according to a preset charging sequence.
In this embodiment, when the battery pack does not satisfy the charging condition, the charging permission instruction is sent to the corresponding battery management system according to a sequence after the battery pack is skipped in a preset charging sequence.
For example, when the battery pack a, the battery pack B, and the battery pack C are all allowed to be charged, the charging sequence is a- > B- > C, and if there is a battery pack that cannot be inhibited from being charged due to a failure or the charging is suspended, the charging is skipped in the previous sequence.
In step S115, the battery management system that receives the charge permission instruction transmits a charge request instruction to the in-vehicle charger.
In the continuous charging stage, the vehicle-mounted charger (OBC) must be ensured to continuously receive a charging instruction, and the vehicle-mounted charger (OBC) is ensured to be in a standby state.
And step S116, the battery management system starts to precharge after receiving the power-on command fed back by the vehicle control.
In this embodiment, when one of the battery packs is fully charged, the vehicle controller allows the battery management system of the next battery pack satisfying the charging condition to send the charging permission instruction when it is determined that the bus voltage tends to 0V and the main relay of the fully charged battery pack is turned off.
After the pre-charging is started, in this embodiment, as shown in fig. 7, the method for controlling uninterruptible ac charging for an electric-only vehicle further includes:
step S131, whether the precharging is successful is detected.
Step S132, when the pre-charging is successful, the battery management system controls the relay of the corresponding battery pack to suck;
step S133, the battery management system sends a charging request current and a charging request voltage to the vehicle-mounted charger according to the state of the battery pack, sends a power-on request to the vehicle controller and continuously sends a charging request instruction to the vehicle-mounted charger; and after receiving the power-on permission instruction fed back by the vehicle control, continuously receiving power supply current from the vehicle-mounted charger to charge the battery pack.
As shown in fig. 8, when detecting whether the pre-charging is successful, if the pre-charging of the current battery pack fails, the failure is reported, the subsequent charging step of the single battery pack is terminated, the charging process of the next battery pack is continued, that is, the pre-charging process is repeated, and when the pre-charging is successful, the main relay of the battery pack is controlled to be closed.
And then sending a request current to the vehicle-mounted charger according to the state of the battery pack, continuously detecting whether the battery pack is fully charged or not, and detecting whether a charging stop fault lamp exists or not.
And if the current battery pack is fully charged, sending a high-voltage-discharging request instruction for stopping charging to the vehicle control unit, and then waiting for the vehicle control unit to feed back the high-voltage-discharging instruction.
Before a power-off instruction sent by the feedback of the vehicle control unit is not received, a charging instruction is continuously sent to the vehicle-mounted charger, that is, as described above, it is necessary to ensure that the vehicle-mounted charger (OBC) continuously receives the charging instruction in a continuous charging stage, and the vehicle-mounted charger (OBC) is in a standby state.
In this embodiment, when the power-off instruction issued by the vehicle control unit is not received after a preset time, the relay of the battery pack is controlled to be turned off to stop charging the battery pack after the timeout is waited.
In this embodiment, when a power-off command issued by the vehicle control unit is received within the preset time, the relay of the battery pack is controlled to be turned off, the battery pack is stopped being charged, the above process is repeated, and the next battery pack is continuously charged, so that the plurality of battery packs are continuously charged without plugging and unplugging the charging gun again.
The embodiment of the invention also provides an electric automobile, which is charged by applying the uninterrupted alternating current charging control method for the pure electric vehicle. The above description has been made in detail for the uninterrupted ac charging control method for the electric-only vehicle, and the detailed description is omitted here.
The electric Vehicle is a pure electric Vehicle, and as shown in fig. 2, an example of a connection relationship between each battery pack in the electric Vehicle and an On Board Charger (OBC) or a Vehicle Control Unit (VCU) is shown.
Each Battery pack is connected in parallel to the bus, each Battery pack has a corresponding Battery Management System (BMS), and the vehicle-mounted charger and the vehicle controller are also connected to the bus. The vehicle-mounted charger is respectively connected with each battery pack, and a Battery Management System (BMS) in each battery pack is awakened simultaneously through an OBC (on board battery) hard line awakening signal.
Wherein the bus is preferably a CAN bus.
The Vehicle Control Unit (VCU) judges whether one or more battery packs meet the charging requirement according to the state information of each battery pack on the bus, and charges the battery pack according to a control strategy, for example, the pack a, the pack B and the pack C according to an agreed charging sequence, and if a certain battery pack does not meet the charging condition, the charging is automatically skipped, and the charging is performed according to the sequence described above. In the charging process, for satisfying user experience, through on-board charger (OBC), Vehicle Control Unit (VCU) and each battery management system (BMS)'s signal interaction, realize not plugging the condition of rifle that charges again, continuously charge for three battery package.
In summary, the present invention applies the ac charging technology to the multi-power-source pure electric vehicle, and in order to meet the user experience during the charging process, the multiple power battery packs are sequentially ac charged without plugging the charging gun again through the signal interaction of the OBC (on-board charger), the VCU (vehicle control unit), and the BMS (battery management system) of each battery pack. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (8)

1. An uninterruptible alternating current charging control method for an electric-only vehicle, the uninterruptible alternating current charging control method for the electric-only vehicle comprising:
the vehicle-mounted charger simultaneously awakens the battery management systems in the plurality of battery packs connected in parallel on the bus; the vehicle-mounted charger is respectively connected with each battery pack, and the vehicle-mounted charger and the whole vehicle controller are connected to the bus;
the vehicle control unit reads the state information of each battery pack from the bus, and judges whether each battery pack meets the charging condition according to the state information of each battery pack;
sequentially charging the battery packs according to the preset charging sequence of the battery packs;
the uninterrupted alternating current charging control method for the pure electric vehicle further comprises the following steps:
the battery management system in each battery pack receives a charging permission instruction from the vehicle control unit and sends a power-on request to the vehicle control unit when receiving the charging permission instruction;
the battery management system in each battery pack sends a charging request current and a charging request voltage to the vehicle-mounted charger according to the maximum allowable charging current and voltage sent by the vehicle-mounted charger;
the sequentially charging the battery packs according to the preset charging sequence of the battery packs comprises the following steps:
when the vehicle control unit judges that the battery pack meets the charging condition according to the state information of the battery pack, the vehicle control unit sends the charging permission instruction to the corresponding battery management system according to a preset charging sequence;
the battery management system receiving the charging permission instruction sends a charging request instruction to the vehicle-mounted charger;
and the battery management system starts pre-charging after receiving the power-on command fed back by the control of the whole vehicle.
2. The uninterruptible alternating current charging control method for electric-only vehicles according to claim 1, characterized in that:
when the charging gun is inserted into the vehicle-mounted charger, the vehicle-mounted charger simultaneously wakes up the battery management systems in the plurality of battery packs connected in parallel on the bus.
3. The uninterruptible alternating current charging control method for electric-only vehicles according to claim 1, characterized in that: the uninterrupted alternating current charging control method for the pure electric vehicle further comprises the following steps:
after a battery management system in a battery pack is awakened, the battery management system detects and acquires state information corresponding to the battery pack and sends the state information of the battery pack to the bus so as to be read by the vehicle control unit.
4. The uninterruptible alternating current charging control method for electric-only vehicles according to claim 1, characterized in that:
and when the battery pack does not meet the charging condition, sending the charging permission instruction to the corresponding battery management system according to the sequence after skipping the battery pack in the preset charging sequence.
5. The uninterruptible alternating current charging control method for electric-only vehicles according to claim 4, characterized in that: and under the condition that one battery pack is fully charged, the vehicle control unit allows the battery management system of the next battery pack meeting the charging condition to send the charging permission instruction when the bus voltage is judged to tend to 0V and the main relay of the fully charged battery pack is disconnected.
6. The uninterruptible alternating current charging control method for electric-only vehicles according to claim 1, characterized in that: the uninterrupted alternating current charging control method for the pure electric vehicle further comprises the following steps:
detecting whether the pre-charging is successful;
when the pre-charging is successful, the battery management system controls the relay of the corresponding battery pack to be closed;
the battery management system sends a charging request current and a charging request voltage to the vehicle-mounted charger according to the state of a battery pack, sends a power-on request to the vehicle control unit and continuously sends a charging request instruction to the vehicle-mounted charger;
and after receiving the power-on permission instruction fed back by the control of the whole vehicle, continuously receiving power supply current from the vehicle-mounted charger to charge the battery pack.
7. The uninterruptible alternating current charging control method for electric-only vehicles according to claim 6, characterized in that: and when the power-off instruction issued by the vehicle control unit is not received within the preset time or the power-off instruction issued by the vehicle control unit is received within the preset time, controlling the relay of the battery pack to be disconnected and stopping charging the battery pack.
8. An electric vehicle, characterized in that: the charging is carried out by applying the uninterrupted AC charging control method for the pure electric vehicle as claimed in any one of claims 1 to 7.
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