CN107599857B - Pure electric vehicle charging system and charging method based on lithium battery - Google Patents
Pure electric vehicle charging system and charging method based on lithium battery Download PDFInfo
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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- 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
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- 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
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Abstract
The invention discloses a pure electric vehicle charging system based on a lithium battery, which comprises power supply equipment, a vehicle-mounted charger, a main relay, a battery management controller, a lithium battery pack and a vehicle control unit, wherein the power supply equipment provides 220V alternating current and can send out a control guide signal; the vehicle-mounted charger is responsible for converting alternating current output by the power supply equipment into direct current required by charging of the lithium ion battery; the main relay is arranged in the lithium ion battery pack and is controlled by the vehicle control unit to determine the connection and disconnection of the high-voltage loop; the battery management controller is used for monitoring the state of the lithium battery pack; and the vehicle control unit is communicated with the vehicle-mounted charger and the battery management controller through a CAN bus. The invention also provides a pure electric vehicle charging method based on the lithium battery. The vehicle controller plays a role in monitoring and supervising the whole charging process, and effectively improves the safety performance of the whole vehicle during charging through the failure protection strategy in the charging process.
Description
Technical Field
The invention belongs to the field of new energy automobiles, and particularly relates to a pure electric automobile charging system and a charging method based on a lithium battery.
Background
Compared with the traditional automobile, the pure electric automobile has the advantages of zero emission and no environmental pollution, so the pure electric automobile is considered as an important way for reducing the environmental pollution and solving the energy crisis, and the application prospect of the pure electric automobile is widely seen. The electric automobile takes a vehicle-mounted power supply as power and utilizes a motor to drive the vehicle to normally run. The lithium battery is a novel battery, has the characteristics of high energy, high safety, high stability, long service life and environmental friendliness, has no memory effect, can be charged at any point in a discharge period, and can effectively maintain electric charge, so that the lithium battery is widely applied to the fields of electric vehicles, energy vehicles and the like.
At present, in the field of new energy, a method for controlling charging of a lithium battery is mainly implemented by controlling a battery management system and a vehicle-mounted charger together to charge, in order to increase the charging speed in a constant current stage, the charging efficiency is often improved by optimizing the vehicle-mounted charger, however, in a mode of optimizing the vehicle-mounted charger to improve the charging efficiency of the lithium battery, the vehicle-mounted charger is usually charged with a large charging current, so that the state of the lithium battery is ignored, the lithium battery is easily damaged due to the fact that the charging current of the lithium battery is too large, and the service life of the lithium battery is influenced. At present, the existing charging technology of the pure electric vehicle generally only considers the safety of the battery in the charging process, neglects the influence of the state of the whole vehicle on charging, and fails to ensure the safety performance of the whole vehicle.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, the invention aims to provide a lithium battery-based pure electric vehicle charging system and a charging method, which realize real-time charging control of a lithium battery through mutual communication among charging systems, improve the charging efficiency of the lithium battery as much as possible, reduce the damage to the lithium battery, play a role in monitoring and supervising the whole charging process by a vehicle controller, and effectively improve the safety performance of the whole vehicle during charging through a failure protection strategy in the charging process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pure electric vehicle charging system based on a lithium battery comprises a power supply device, a vehicle-mounted charger, a main relay, a battery management controller, a lithium battery pack and a vehicle control unit, wherein the power supply device is used for providing 220V alternating current and sending a control guide signal for indicating the power supply capacity of a charging pile, and the power supply device reads the state of a switch and can judge whether a vehicle end is allowed to be charged or not;
the vehicle-mounted charger is used for converting alternating current output by the power supply equipment into direct current for charging the lithium battery pack, and charging the lithium battery pack in an optimal mode according to an instruction of the vehicle control unit and battery state information provided by the battery management controller;
the main relay is arranged in the lithium battery pack, is controlled by the vehicle control unit and is used for controlling the connection and disconnection of the high-voltage loop;
the battery management controller is used for monitoring the state of the lithium battery pack, informing the vehicle controller and the vehicle-mounted charger of relevant parameters of battery voltage, current, temperature and SOC (state of charge) in real time, and communicating with the vehicle controller;
and the vehicle control unit performs state interaction with the vehicle-mounted charger and the battery management controller through the CAN network, and is used for managing the vehicle control system and coordinating the work of the whole charging system.
Further, the vehicle controller is specifically configured to synthesize states of the components, determine whether charging is allowed to be started, calculate a charging current and voltage, and monitor, diagnose and protect against failure of the states of the components.
A pure electric vehicle charging method based on the charging system comprises the following steps:
step A, a detection stage before charging, which comprises the steps of identification of a charging request, detection of a state before charging, a high-voltage electrifying process and awakening of each part of a charging system, and connection confirmation of a charging plug;
step B, in a state detection stage in charging, after charging is started, the vehicle controller can continuously detect necessary charging conditions, and the necessary charging conditions comprise a battery management controller, a vehicle-mounted charger, a control guide signal, a charging interface connection signal, a main relay, a lithium battery pack and a vehicle detection item; if the abnormal condition or the full charge of the lithium battery pack is detected, sending a corresponding operation instruction according to the severity of the abnormal condition, wherein the operation instruction comprises an operation instruction for limiting power charging, suspending charging or stopping charging;
and C, finishing the charging stage, and sending an instruction to stop the charging by the vehicle control unit, wherein the steps of stopping charging, powering off at high voltage and recording fault information are included.
Further, in the step a, in the charging request identification, after the user inserts the charging gun, the vehicle-mounted charger is awakened by the charging interface connection signal, and then the vehicle-mounted charger awakens the vehicle control unit through a hard wire signal, and after the vehicle control unit is started, the relevant relay is closed, so that the low-voltage part relevant to charging in the vehicle is enabled.
Further, in the step a, in the pre-charging state detection, the vehicle controller acquires a battery management controller, a vehicle-mounted charger, a control guide signal, a charging interface connection signal, a main relay and a vehicle detection item, comprehensively judges whether to start charging, and enters a high-voltage electrifying stage if the charging is judged to be allowed to start; and if the charging is not allowed, entering a charging ending process.
Further, in the step a, in a high-voltage power-on stage, the vehicle controller closes the main relay to conduct a high-voltage circuit of the vehicle, and reads back the state of the main relay, after detecting that the closed state of the high-voltage circuit of the vehicle controller is normal, that is, the high-voltage power-on is successful, the vehicle controller sends a charging start instruction to the vehicle-mounted charger, and if the high-voltage power-on is abnormal, the vehicle controller enters a charging end process.
Further, in step a, the pre-charge state detection further includes: the maximum charging current allowed by the lithium battery pack, the maximum current capable of being provided by the charging pile and the rated current of the charging cable are used, and the minimum value of the maximum charging current, the maximum current capable of being provided by the charging pile and the rated current of the charging cable is used as the final charging current and is sent to the vehicle-mounted charger.
Further, in the step B, the limiting power charging means that when the battery management controller or the vehicle-mounted charger requests to limit charging power, including when the vehicle-mounted charger detects that the internal temperature of the vehicle is higher than or lower than a set temperature range, the vehicle controller sends a low-power charging request, and the vehicle controller sets an upper limit of charging current;
the charging suspension means that when the whole charging system has a recoverable fault, including that the vehicle-mounted charger has a recoverable fault, the charging gun is in a semi-connection state, the control guide signal is abnormal, and the CAN communication fault occurs, the vehicle controller controls the vehicle-mounted charger to suspend output, and at the moment, the vehicle controller controls the high-voltage system not to be powered off; within a certain waiting time, if abnormal recovery occurs, the vehicle controller controls the vehicle-mounted charger to continue outputting, if abnormal recovery does not occur, charging is stopped, and the waiting time is set to be 25-40 s;
and stopping charging, namely detecting the conditions that the vehicle control unit cannot be charged, the lithium battery pack is fully charged or the charging needs to be stopped immediately when the vehicle control unit detects an unrecoverable fault, the charging is not allowed, the charging connector is completely disconnected, the battery management controller sends a three-level fault or the voltage of the lithium battery pack is too low, and the electronic lock of the charging interface is opened, and then the vehicle control unit enters a charging stopping process.
Further, in step C, when the vehicle controller monitors that the charging is abnormal or the charging is completed, the vehicle controller sends a charging stop instruction to the vehicle-mounted charger, and after the charging stop condition is reached, the vehicle-mounted charger, the vehicle controller, and the battery management controller enter a sleep state.
Further, after the charging stopping instruction is sent, the vehicle control unit controls the main relay to disconnect the high-voltage loop, records relevant information and then shuts down, after charging is stopped, the charging gun must be manually pulled down, charging can be started again, and even if a fault is recovered, charging cannot be started again.
Compared with the prior art, the invention has the following beneficial effects:
the charging system realizes real-time charging control of the lithium battery through mutual communication between the charging systems, reduces damage to the lithium battery while improving the charging efficiency of the lithium battery as much as possible, and the vehicle control unit plays a role in monitoring and controlling the whole charging process and effectively improves the safety performance of the whole vehicle during charging through an invalidation protection strategy in the charging process.
Drawings
Fig. 1 is a structural framework diagram of a pure electric vehicle charging system according to an embodiment of the present invention.
Fig. 2 is a functional framework diagram of a pure electric vehicle charging system according to an embodiment of the present invention.
Fig. 3 is a schematic specific flow chart of charging of the pure electric vehicle according to the embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the specific embodiments according to the attached drawings of the specification.
The pure electric vehicle charging system based on the lithium battery of the invention is briefly described with reference to fig. 1:
as shown in fig. 1, a pure electric vehicle charging system based on lithium batteries comprises a power supply device, a vehicle-mounted charger OBC, a main relay RLY, a battery management controller BMS, a lithium battery pack and a vehicle control unit VCU,
the power supply equipment is used for providing 220V alternating current, a charging interface of the power supply equipment is connected with a control guide signal (CP signal) through a charging interface connection signal (CC signal) and an OBC (on-board battery charger), the control guide signal can be sent out and used for indicating the power supply capacity of the charging pile, and the power supply equipment reads the state of a switch and can judge whether the vehicle end is allowed to be charged or not;
the vehicle-mounted charger OBC is used for converting alternating current output by the power supply equipment into direct current for charging the lithium battery pack and charging the lithium battery pack in an optimal mode according to instructions of the VCU of the vehicle control unit and battery state information provided by the BMS;
the main relay RLY is arranged in the lithium battery pack, is controlled by a VCU (vehicle control unit) and is used for controlling the connection and disconnection of a high-voltage loop;
the battery management controller BMS is used for monitoring the state of the lithium battery pack, informing the relevant parameters of the battery voltage, the current, the temperature and the SOC to the vehicle control unit VCU and the vehicle-mounted charger OBC in real time, and communicating with the vehicle control unit VCU;
and the VCU of the vehicle control unit performs state interaction with the OBC and the BMS through the CAN network and is used for managing the vehicle control system and coordinating the work of the whole charging system.
The functional framework diagram of the lithium battery-based pure electric vehicle charging system of the present invention is described below with reference to fig. 2:
as shown in fig. 2, the vehicle control unit VCU performs decision making and control functions. The VCU of the vehicle controller needs to integrate the states of all parts, such as the connection state of a charging gun and the power supply state of a charging pile, judges whether charging is allowed to be started or not, and calculates the charging current and voltage through mutual communication with an OBC (on-board battery) of a vehicle charger and a BMS (battery management controller) in a lithium ion battery, so that the functions of monitoring, diagnosing and failure protection of all parts of the whole vehicle are realized. The whole slow charging process can be divided into three stages, namely detection before charging, monitoring during charging and charging ending, in each different stage, the control effect of the VCU of the vehicle controller is different, and the safety performance of the whole vehicle during charging is mainly realized by controlling the main relay RLY, the vehicle-mounted charger OBC and the battery management controller BMS.
The charging method of the pure electric vehicle based on the charging system of the invention is described below with reference to fig. 3:
a pure electric vehicle charging method based on the charging system comprises the following steps:
step A: and in the detection stage before charging, in the charging request identification, after a user inserts a charging gun, the OBC is awakened by a charging interface connection signal (CC signal), then the OBC is awakened by a VCU through a hard wire signal, and after the VCU is started, the related relay is closed to enable a low-voltage part related to charging in the vehicle. If the wake-up success signal of the VCU of the vehicle control unit cannot be received after 30ms, the OBC enters a sleep state.
After the charging gun is inserted, if the hand of the gun inserter still presses the button on the charging gun, the charging gun is in a half-connection state; after the hand of the person inserting the gun releases the button on the charging gun, the charging gun is in a complete connection state. And when the vehicle is in a half-connection state and a full-connection state, the motor is locked, so that the vehicle is in a non-drivable state. If the vehicle motor can not be locked, the charging is forbidden and the vehicle enters a dormant state.
In the pre-charging state detection, the on-board charger OBC and the battery management controller BMS may perform self-detection and transmit a state of whether charging is allowed to be performed to the VCU. The VCU of the vehicle control unit can acquire a battery management controller BMS, a vehicle-mounted charger OBC, a control guide signal, a charging interface connection signal, a main relay RLY and other detection items of the vehicle control unit, and comprehensively judges whether charging is started or not. If the charging is allowed to be started, entering a high-voltage electrifying stage; and if the charging is not allowed, entering a charging ending process.
During the period, the VCU of the vehicle control unit compares the maximum charging current allowed by the lithium battery pack, the maximum current capable of being provided by the charging pile and the rated current of the charging cable, and sends the minimum value of the maximum charging current, the maximum current capable of being provided by the charging pile and the rated current of the charging cable to the OBC of the vehicle-mounted charger.
The maximum charging current allowed by the lithium battery pack can be obtained by collecting related parameters such as voltage, current, battery temperature, SOC value and the like of the lithium battery pack and carrying out predetermined analysis and calculation to obtain corresponding control data.
The maximum current that can be provided by the charging pile can be obtained by monitoring a control pilot signal (CP signal). The control guide signal is used for monitoring interaction between the electric automobile and the electric automobile power supply equipment, is sent by the charging pile, is connected into the vehicle-mounted charger OBC, and then sends the signal state to the VCU through the CAN line. The purpose of the VCU monitoring the control pilot signal is to know the state of the charging pile, and the duty ratio of the control pilot signal indicates whether the charging pile allows charging and the maximum charging current that can be provided.
The rated current of the charging cable can be obtained from the resistance value of the charging interface connection signal (CC signal). According to the resistance value of the charging interface connection signal, the connection state of the charging connector can be judged, and the rated current capacity of the charging cable is marked.
In the high-voltage electrifying stage, the VCU sends a main relay closing instruction to the BMS according to the BMS, the OBC, the RLY and the monitoring result of the VCU, if the result is normal, the VCU switches on a high-voltage loop of the vehicle, reads back the state of the RLY, and sends a monitoring completion signal to the OBC. After the closed state of a high-voltage loop of the VCU of the vehicle controller is detected to be normal, namely high-voltage electrification is successful, the VCU of the vehicle controller sends a charging starting instruction to the OBC of the vehicle-mounted charger, and if the high-voltage electrification is abnormal, a charging ending process is started.
Step B, in a state detection stage during charging, after charging is started, a VCU (vehicle control unit) can continuously detect necessary charging conditions, wherein the necessary charging conditions comprise a battery management controller BMS, a vehicle-mounted charger OBC, a control guide signal, a charging interface connection signal, a main relay RLY and other detection items of the whole vehicle, and the monitoring period is not more than 35 ms;
if the abnormal condition is detected, a failure protection strategy is made according to the severity of the abnormal condition, wherein the failure protection strategy comprises strategies of limiting power charging, suspending charging or stopping charging and the like. The charging is also stopped after detecting that the battery pack is fully charged.
The power limitation charging means that when the battery management controller BMS or the on-board charger OBC requests to limit the charging power, for example, when the on-board charger OBC detects that the internal temperature of the on-board charger OBC is higher than or lower than a set temperature range, the on-board charger OBC sends a low-power charging request to the vehicle control unit VCU, and the vehicle control unit VCU sets an upper limit of the charging current.
The charging suspension means that when the whole charging system has a recoverable fault, for example, a vehicle-mounted charger OBC recoverable fault, a charging gun in a semi-connected state, control guidance signal abnormality, a CAN communication fault and the like, the vehicle control unit VCU controls the vehicle-mounted charger OBC to suspend output, and at the moment, the vehicle control unit VCU controls the high-voltage system not to be powered off. Within a certain time, if abnormal recovery occurs, the VCU controls the OBC to continue outputting, and if abnormal recovery does not occur, charging is stopped, and the waiting time is generally set to be 30 s.
And stopping charging, namely, the vehicle control unit VCU detects that an unrecoverable fault occurs or charging needs to be stopped immediately, for example, charging is not allowed by the charging pile, the charging connector is completely disconnected, the battery management controller BMS has a three-level fault or the voltage of the storage battery is too low, the charging interface electronic lock is turned on, and the like, and then the vehicle control unit VCU enters a charging stopping process. In addition, when the battery pack is fully charged, the charging process is also stopped.
And C: when the vehicle control unit VCU monitors that the charging is abnormal or the charging is finished, a charging stop instruction is sent to the vehicle-mounted charger OBC, and after the charging stop condition is reached, the vehicle-mounted charger OBC, the vehicle control unit VCU and the battery management controller BMS enter a dormant state.
After the power failure instruction is sent, the VCU of the vehicle control unit controls the main relay RLY to disconnect the high-voltage loop and shut down after recording related information. In the charging stopping process, even if the fault is recovered, the charging cannot be started again, and the charging can be started again only after the user pulls out the charging gun manually.
It should be noted that the above-mentioned embodiment is only an example of the present invention, and is not intended to limit the implementation and the scope of the invention, and those skilled in the art can make variations and modifications to the above-mentioned embodiment according to the disclosure and the explanation of the above-mentioned description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some equivalent modifications and variations of the present invention should be covered by the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. The utility model provides a pure electric vehicles charging system based on lithium cell, includes power supply unit, on-vehicle machine that charges, main relay, battery management controller, lithium cell package and vehicle control unit, its characterized in that:
the power supply equipment is used for providing 220V alternating current and sending a control guide signal for indicating the power supply capacity of the charging pile, and the power supply equipment reads the state of the switch and can judge whether the vehicle end is allowed to be charged or not;
the vehicle-mounted charger is used for converting alternating current output by the power supply equipment into direct current for charging the lithium battery pack, and charging the lithium battery pack in an optimal mode according to an instruction of the vehicle control unit and battery state information provided by the battery management controller;
the main relay is arranged in the lithium battery pack, is controlled by the vehicle control unit and is used for controlling the connection and disconnection of the high-voltage loop;
the battery management controller is used for monitoring the state of the lithium battery pack, informing the vehicle controller and the vehicle-mounted charger of relevant parameters of battery voltage, current, temperature and SOC (state of charge) in real time, and communicating with the vehicle controller;
the vehicle controller performs state interaction with the vehicle-mounted charger and the battery management controller through the CAN network, and is used for managing a vehicle system and coordinating the work of the whole charging system; the whole vehicle controller is specifically used for integrating the states of all the components, judging whether charging is allowed to be started or not, calculating the magnitude of charging current and voltage, and monitoring, diagnosing and performing failure protection on the states of all the components;
the charging method of the pure electric vehicle charging system comprises the following steps:
step A, a detection stage before charging, which comprises the steps of identification of a charging request, detection of a state before charging, a high-voltage electrifying process and awakening of each part of a charging system, and connection confirmation of a charging plug;
step B, in a state detection stage in charging, after charging is started, the vehicle controller can continuously detect necessary charging conditions, and the necessary charging conditions comprise a battery management controller, a vehicle-mounted charger, a control guide signal, a charging interface connection signal, a main relay, a lithium battery pack and a vehicle detection item; if the abnormal condition or the full charge of the lithium battery pack is detected, sending a corresponding operation instruction according to the severity of the abnormal condition, wherein the operation instruction comprises an operation instruction for limiting power charging, suspending charging or stopping charging;
and C, finishing the charging stage, and sending an instruction to stop the charging by the vehicle control unit, wherein the steps of stopping charging, powering off at high voltage and recording fault information are included.
2. A pure electric vehicle charging method based on the charging system of claim 1 is characterized by comprising the following steps:
step A, a detection stage before charging, which comprises the steps of identification of a charging request, detection of a state before charging, a high-voltage electrifying process and awakening of each part of a charging system, and connection confirmation of a charging plug; in the charging request identification, after a user inserts a charging gun, the vehicle-mounted charger is awakened by a charging interface connection signal, then the vehicle-mounted charger awakens a vehicle control unit through a hard wire signal, and after the vehicle control unit is started, a related relay is closed to enable a low-voltage part related to charging in a vehicle; in the state detection before charging, the vehicle control unit acquires a battery management controller, a vehicle-mounted charger, a control guide signal, a charging interface connection signal, a main relay and a vehicle detection item, comprehensively judges whether to start charging, and enters a high-voltage electrifying stage if the charging is judged to be allowed to start; if the charging is not allowed, entering a charging ending process; in a high-voltage electrifying stage, the vehicle controller closes the main relay to conduct a vehicle high-voltage loop, the state of the main relay is read back, after the closed state of the vehicle controller high-voltage loop is detected to be normal, namely high-voltage electrifying is successful, the vehicle controller sends a charging starting instruction to the vehicle-mounted charger, and if the high-voltage electrifying is abnormal, a charging ending process is carried out;
step B, in a state detection stage in charging, after charging is started, the vehicle controller can continuously detect necessary charging conditions, and the necessary charging conditions comprise a battery management controller, a vehicle-mounted charger, a control guide signal, a charging interface connection signal, a main relay, a lithium battery pack and a vehicle detection item; if the abnormal condition or the full charge of the lithium battery pack is detected, sending a corresponding operation instruction according to the severity of the abnormal condition, wherein the operation instruction comprises an operation instruction for limiting power charging, suspending charging or stopping charging;
and C, finishing the charging stage, and sending an instruction to stop the charging by the vehicle control unit, wherein the steps of stopping charging, powering off at high voltage and recording fault information are included.
3. The pure electric vehicle charging method according to claim 2, characterized in that: in step a, the pre-charge state detection further includes: the maximum charging current allowed by the lithium battery pack, the maximum current capable of being provided by the charging pile and the rated current of the charging cable are used, and the minimum value of the maximum charging current, the maximum current capable of being provided by the charging pile and the rated current of the charging cable is used as the final charging current and is sent to the vehicle-mounted charger.
4. The pure electric vehicle charging method according to claim 2, characterized in that: in the step B, the power limitation charging means that when the battery management controller or the vehicle-mounted charger requests to limit the charging power, including when the vehicle-mounted charger detects that the internal temperature of the vehicle is higher than or lower than a set temperature range, a low-power charging request is sent to the whole vehicle controller, and the whole vehicle controller sets the upper limit of the charging current;
the charging suspension means that when the whole charging system has a recoverable fault, including that the vehicle-mounted charger has a recoverable fault, the charging gun is in a semi-connection state, the control guide signal is abnormal, and the CAN communication fault occurs, the vehicle controller controls the vehicle-mounted charger to suspend output, and at the moment, the vehicle controller controls the high-voltage system not to be powered off; within a certain waiting time, if abnormal recovery occurs, the vehicle controller controls the vehicle-mounted charger to continue outputting, if abnormal recovery does not occur, charging is stopped, and the waiting time is set to be 25-40 s;
and stopping charging, namely detecting the conditions that the vehicle control unit cannot be charged, the lithium battery pack is fully charged or the charging needs to be stopped immediately when the vehicle control unit detects an unrecoverable fault, the charging is not allowed, the charging connector is completely disconnected, the battery management controller sends a three-level fault or the voltage of the lithium battery pack is too low, and the electronic lock of the charging interface is opened, and then the vehicle control unit enters a charging stopping process.
5. The pure electric vehicle charging method according to claim 2, characterized in that: in the step C, when the vehicle control unit monitors that the charging is abnormal or the charging is completed, the vehicle control unit sends a charging stop instruction to the vehicle-mounted charger, and after the charging stop condition is reached, the vehicle-mounted charger, the vehicle control unit and the battery management controller enter a sleep state.
6. A pure electric vehicle charging method according to claim 3 or 4, characterized in that: after the charging stopping instruction is sent, the vehicle control unit controls the main relay to disconnect the high-voltage loop, records relevant information and then shuts down, after the charging is stopped, the charging gun must be manually pulled down, the charging can be started again, and even if the fault is recovered, the charging cannot be started again.
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| CN108494024B (en) * | 2018-01-22 | 2020-07-07 | 许继电源有限公司 | Charger pause power output control method and charger |
| CN108445404A (en) * | 2018-03-06 | 2018-08-24 | 曾祥华 | The performance test methods and device of battery management system |
| CN108548968A (en) * | 2018-03-06 | 2018-09-18 | 湖南小步科技有限公司 | The performance testing device and test method of battery management system |
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