CN112848931B - Charging method of vehicle-mounted charger, vehicle-mounted charger and vehicle - Google Patents
Charging method of vehicle-mounted charger, vehicle-mounted charger and vehicle Download PDFInfo
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- CN112848931B CN112848931B CN201911192326.8A CN201911192326A CN112848931B CN 112848931 B CN112848931 B CN 112848931B CN 201911192326 A CN201911192326 A CN 201911192326A CN 112848931 B CN112848931 B CN 112848931B
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- mounted charger
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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
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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
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
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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
- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- Y02T10/72—Electric energy management in electromobility
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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
- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The application provides a charging method of a vehicle-mounted charger, the vehicle-mounted charger and a vehicle, when the vehicle is connected with an external charging device and receives a charging request signal of the external charging device, the current voltage of a power battery is detected, different charging modes are selected to charge the power battery according to the relation between the current voltage of the power battery and the minimum threshold voltage of the vehicle-mounted charger, especially when the current voltage of the power battery is less than the minimum threshold voltage of the vehicle-mounted charger, the trickle charging mode is selected to charge the power battery to improve the voltage of the power battery, the problems that the power tube in the vehicle-mounted charger has uncontrollable rectification phenomenon and the power tube is possibly damaged due to the large voltage difference formed between the output voltage of the vehicle-mounted charger and the current voltage of the power battery are avoided, and the safety of the vehicle-mounted charger in the charging process of the power battery is improved, meanwhile, the phenomenon that the small vehicle cannot be charged by the power battery and is anchored is avoided.
Description
Technical Field
The application relates to the technical field of vehicle charging, in particular to a charging method of a vehicle-mounted charger, the vehicle-mounted charger and a vehicle.
Background
At present, while electric vehicles are rapidly developed, as an important component in the development industry chain of electric vehicles, electric vehicle charging equipment is also produced, and the electric vehicle charging equipment is a supporting facility for charging electric vehicles, and comprises a charging station, a charging pile, a battery equipment maintenance system and the like. Charging equipment in the electric vehicle charging station is mainly divided into a direct current charging pile and an alternating current charging pile. The equipment that is connected with charging stake On the vehicle is OBC (On-board charger), and OBC has two kinds of forms: non-isolated OBC and isolated OBC, when non-isolated OBC charges, require on the one hand that charging efficiency is high, on the other hand requires voltage range wide, can set up the undervoltage protection threshold value for this reason, when whole car battery voltage is less than the minimum threshold voltage that non-isolated OBC set up, non-isolated OBC probably appears uncontrollable rectification phenomenon because of the voltage point is too low this moment in the related bridge circuit, probably damages OBC.
Content of application
The application aims to provide a charging method of a vehicle-mounted charger, the vehicle-mounted charger and a vehicle, and solves the problem that the vehicle-mounted charger is damaged due to the fact that an uncontrollable rectification phenomenon occurs when the voltage of a battery of the whole vehicle is lower than the lowest threshold voltage set by the vehicle-mounted charger.
The first aspect of the present application provides a charging method for an onboard charger, where the onboard charger is connected to a power battery, and the charging method includes:
detecting the current voltage of the power battery when receiving a charging request signal of an external charging device;
judging whether the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger or not;
when the current voltage of the power battery is not lower than the minimum threshold voltage of the vehicle-mounted charger, entering a normal charging mode to charge the power battery;
when the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger, entering a trickle charging mode to charge the power battery until the voltage of the power battery reaches the minimum threshold voltage of the vehicle-mounted charger, and when the voltage of the power battery reaches the minimum threshold voltage, entering a normal charging mode to charge the power battery.
The present application in a second aspect provides an on-vehicle charger comprising:
the signal receiving module is used for receiving a charging request signal of external charging equipment;
the voltage detection module is used for detecting the current voltage of the power battery;
the control module is used for judging whether the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger or not; when the current voltage of the power battery is not lower than the minimum threshold voltage of the vehicle-mounted charger, entering a normal charging mode to charge the power battery; when the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger, entering a trickle charging mode to charge the power battery until the voltage of the power battery reaches the minimum threshold voltage of the vehicle-mounted charger, and when the voltage of the power battery reaches the minimum threshold voltage, entering a normal charging mode to charge the power battery.
The third aspect of the application provides a vehicle, the vehicle comprises the vehicle-mounted charger and the power battery, and the vehicle-mounted charger is connected with the power battery.
The application provides a charging method of a vehicle-mounted charger, the vehicle-mounted charger and a vehicle, when the vehicle is connected with an external charging device, a charging request signal of the external charging device is received, the current voltage of a power battery is detected, different charging modes are selected to charge the power battery according to the relation between the current voltage of the power battery and the minimum threshold voltage of the vehicle-mounted charger, especially when the current voltage of the power battery is smaller than the minimum threshold voltage of the vehicle-mounted charger, a trickle charging mode is selected to charge the power battery to improve the voltage of the power battery, the problems that the power tube in the vehicle-mounted charger generates uncontrollable rectification and can damage the power tube due to the large voltage difference formed between the output voltage of the vehicle-mounted charger and the current voltage of the power battery are avoided, and the safety of the vehicle-mounted charger in the charging process of the power battery is improved, meanwhile, the phenomenon that the power battery cannot be charged and the vehicle is broken down is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of a charging method of an in-vehicle charger according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a connection structure of an on-vehicle charger according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of an onboard charger according to an embodiment of the present application;
FIG. 4 is a graph of current and voltage curves in an on-board charger provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of an in-vehicle charger according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
An embodiment of the present application provides a charging method of an onboard charger, as shown in fig. 1, the charging method includes:
and S10, detecting the current voltage of the power battery when receiving a charging request signal of the external charging equipment.
In step S10, when the vehicle-mounted charger is connected to the external charging device (e.g., charging post), the vehicle-mounted charger communicates with the external charging device, receives a charging request signal from the external charging device, obtains a voltage state of the power battery, and selects a charging mode according to the voltage state of the power battery.
And S20, judging whether the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger.
In step S20, the minimum threshold voltage of the vehicle-mounted charger is the minimum voltage that the vehicle-mounted charger can output, and for example, a certain model of vehicle-mounted charger outputs a threshold voltage ranging from 340 volts to 450 volts, and the minimum threshold voltage is 340 volts.
And S30, when the current voltage of the power battery is not lower than the minimum threshold voltage of the vehicle-mounted charger, entering a normal charging mode to charge the power battery.
In step S30, when the current voltage of the power battery is greater than or equal to the minimum threshold voltage of the vehicle-mounted charger, the vehicle-mounted charger enters a normal charging mode, where the normal charging mode is that the external charging device performs constant-current charging or constant-voltage charging on the power battery through the vehicle-mounted charger, so that the electric quantity of the power battery can be continuously increased, and the vehicle-mounted charger performs voltage boosting or voltage reduction conversion and outputs the converted electric quantity to the power battery.
And S40, when the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger, entering a trickle charging mode to charge the power battery until the voltage of the power battery reaches the minimum threshold voltage of the vehicle-mounted charger, and when the voltage of the power battery reaches the minimum threshold voltage, entering a normal charging mode to charge the power battery.
In step S40, when the current voltage of the power battery is lower than the minimum value of the voltage threshold range of the vehicle-mounted charger, a large voltage difference is formed between the output voltage of the vehicle-mounted charger and the current voltage of the power battery, if in the normal charging mode, the voltage difference can cause the uncontrollable rectification phenomenon of the power tube in the vehicle-mounted charger, possibly damaging the power tube, in order to avoid the damage of the voltage difference to the power tube in the vehicle-mounted charger, the state is switched to the trickle charging mode for charging the power battery, wherein the trickle charging mode is that the vehicle-mounted charger outputs a small current to charge the power battery, the trickle charging mode is adopted for charging the power battery to increase the voltage of the power battery, when the voltage of the power battery is detected to be equal to the minimum threshold voltage, the large voltage difference between the output voltage of the vehicle-mounted charger and the current voltage of the power battery can be reduced, and at the moment, the power battery is charged by switching to a normal charging mode.
The embodiment of the invention provides a charging method of a vehicle-mounted charger, which comprises the steps of detecting the current voltage of a power battery when a charging request signal of an external charging device is received, selecting different charging modes to charge the power battery according to the relation between the current voltage of the power battery and the minimum threshold voltage of the vehicle-mounted charger, particularly selecting to enter a trickle charging mode to charge the power battery to improve the voltage of the power battery when the current voltage of the power battery is smaller than the minimum threshold voltage of the vehicle-mounted charger, avoiding the problems that the power tube in the vehicle-mounted charger generates uncontrollable rectification phenomenon and can damage the power tube due to the large voltage difference between the output voltage of the vehicle-mounted charger and the current voltage of the power battery, improving the safety of the vehicle-mounted charger in the charging process of the power battery, meanwhile, the phenomenon that the small vehicle cannot be charged by the power battery and is anchored is avoided.
As an embodiment, entering the trickle charge mode to charge the power battery further comprises:
the two ends of the power battery are connected in parallel with a voltage limiting resistor, so that the voltage of the power battery is limited to be a preset voltage.
In this step, the voltage limiting resistor is used to maintain the voltage of the power battery, and when the voltage limiting resistor is connected in parallel with the power battery and current flows through the voltage limiting resistor, the voltage of the power battery is increased to a preset voltage.
As an example, the voltage limiting resistor and the controllable switch are connected in series to form a voltage limiting circuit, the voltage limiting circuit is connected with the power battery in parallel, and the voltage limiting resistor and the power battery are connected in parallel by controlling the controllable switch to be closed.
In the step, the voltage limiting resistors are connected in parallel at the two ends of the power battery, so that the voltage of the power battery is increased to the preset voltage through the voltage limiting resistors, and a large voltage difference between the output voltage of the vehicle-mounted charger and the current voltage of the power battery is avoided.
As an embodiment, entering into the trickle charge mode to charge the power battery further comprises:
the vehicle-mounted charger sends a trickle charging instruction to the battery management system, the vehicle body controller and the vehicle controller, the battery management system drives the pre-charging circuit to work according to the trickle charging instruction and sends a feedback signal to the vehicle controller, the vehicle body controller conducts trickle charging mode power distribution according to the trickle charging instruction and sends a feedback signal to the vehicle controller, and the vehicle controller sends a control instruction for entering the trickle charging mode to the vehicle-mounted charger according to the feedback signal.
As an example, as shown in fig. 2, the vehicle-mounted charger 10 is connected to the vehicle body controller 30, the vehicle controller 40, the battery management system 50 and the pre-charging circuit 60 respectively, the pre-charging circuit 60 is connected to the power battery 70, when the vehicle-mounted charger is connected to the charging post 20, and when it is detected that the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger 10, the vehicle-mounted charger 10 sends a trickle charging command to the battery management system 50, the vehicle body controller 30 and the vehicle controller 40, the battery management system 50 receives the command to turn on the pre-charging circuit 60 and performs protection and control of the pre-charging circuit according to the current loop real-time feedback, the pre-charging circuit 60 includes a controllable switch and a pre-charging resistor connected in series, the pre-charging resistor is connected between the vehicle-mounted charger 10 and the power battery 70 by controlling the controllable switch, the battery management system 50 receives the command to distribute power to relevant components and performs relevant user reminding and display according to the vehicle command simultaneously, for example, the current charging mode is displayed to the user as the trickle charging mode through the display, and the charging time of the trickle charging mode can be calculated and displayed according to the current charging state of the power battery 70, the vehicle-mounted charger 10 enters the trickle charging mode after the battery management system 50 and the vehicle body controller 30 are prepared, and the vehicle controller 40, the battery management system 50, the vehicle body controller 30 and the like respond to the trickle charging in the trickle charging mode until the voltage value of the power battery 70 reaches the minimum threshold voltage, and automatically switch to the normal charging mode to complete the charging operation required by the user.
As an embodiment, the vehicle-mounted charger includes an energy storage module, a first switch module and a second switch module, the external charging device, the energy storage module and the first switch module form a first charging loop, and the external charging device, the energy storage module, the second switch module and the power battery form a second charging loop.
Entering the normal charging mode to charge the power battery in step S30 further includes:
and controlling the first switch module and the second switch module to be alternately conducted so that the first charging loop and the second charging loop alternately work to charge the power battery.
In this step, when the first switch module is controlled to be turned on and the second switch module is controlled to be turned off, the first charging circuit starts to work, the external charging device charges the energy storage module, after the energy storage module finishes charging, the first switch module is controlled to be turned off and the second switch module is controlled to be turned on, the second charging circuit starts to work, and the external charging device and the energy storage module charge the power battery.
As an example, as shown in fig. 3, the vehicle charger includes an energy storage module, a first switch module and a second switch module, the energy storage module is an inductor L, the first switch module is a first IGBT Q1(Insulated Gate Bipolar Transistor), the second switch module is a second IGBT Q2, the vehicle charger further includes a fuse F, a first capacitor C1, a second capacitor C2, a switch K, a voltage limiting resistor R and a power battery E, wherein, when the vehicle charger is connected to the external charging module, the fuse F, the inductor L and the first IGBT Q1 form a first charging loop, the external charging module, the fuse F, the inductor L, the first IGBT Q2 and the power battery E form a second charging loop, first IGBT Q1 is controlled to be turned on, and second IGBT Q2 is controlled to be turned off, at this time, the external charging module charges the inductor L by storing energy, when the inductor L finishes charging, the first IGBT Q1 is controlled to be turned off, meanwhile, the second IGBT Q2 is controlled to be turned on, the voltage output by the external charging module and the voltage output by the inductor L are superposed to charge the power battery E, and an output voltage higher than the input voltage is formed through rectification of the second capacitor C2. When the current output by the second IGBT Q2 decreases to 0A, the second IGBT Q2 is turned off, and the first IGBT Q1 is turned on, and the next cycle is entered.
When the current voltage of the power battery is lower than the set minimum threshold voltage before the vehicle-mounted charger charges the power battery, the voltage difference between the inductor L and the two ends of the power battery is loaded on the second IGBT Q2, because the internal resistance of the battery in the whole loop is very small and lower than 5m omega, the current on the second IGBT Q2 is uncontrolled (as shown in figure 4), a large instantaneous current appears, the second IGBT Q2 is easily burnt, in order to avoid burning the second IGBT Q2, the trickle charging mode is entered at the moment, and the switch K is controlled to be switched on, so that the voltage limiting resistor R and the power battery E are connected in parallel, and due to the parallel connection of the voltage limiting resistor R, the voltage of the power battery E is increased, the voltage difference between the inductor L and the power battery E is reduced, the power battery is charged, and the second IGBT Q2 cannot be burnt in the charging process.
Another embodiment of the present application provides an in-vehicle charger 10, as shown in fig. 5, the in-vehicle charger 10 includes:
a signal receiving module 101, configured to receive a charging request signal of an external charging device;
the voltage detection module 103 is used for detecting the current voltage of the power battery;
the control module 102 is used for judging whether the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger; when the current voltage of the power battery is not lower than the minimum threshold voltage of the vehicle-mounted charger, entering a normal charging mode to charge the power battery; when the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger, the trickle charging mode is entered to charge the power battery until the voltage of the power battery reaches the minimum threshold voltage of the vehicle-mounted charger, and when the voltage of the power battery reaches the minimum threshold voltage, the normal charging mode is entered to charge the power battery.
Further, the control module 102 is further configured to connect the two ends of the power battery in parallel with a voltage limiting resistor, so as to limit the voltage of the power battery to be a preset voltage.
Further, the control module 102 is further configured to send a trickle charge instruction to the battery management system, the vehicle body controller, and the vehicle controller, the battery management system drives the pre-charge circuit to operate according to the trickle charge instruction and sends a feedback signal to the vehicle controller, the vehicle body controller performs power distribution in the trickle charge mode according to the trickle charge instruction and sends a feedback signal to the vehicle controller, and the vehicle controller sends a control instruction to enter the trickle charge mode to the control module according to the feedback signal.
Furthermore, the vehicle-mounted charger further comprises an energy storage module, a first switch module and a second switch module, the control module is connected with the first switch module and the second switch module, the external charging equipment, the energy storage module and the first switch module form a first charging loop, and the external charging equipment, the energy storage module, the second switch module and the power battery form a second charging loop;
the control module 102 is further configured to:
and controlling the first switch module and the second switch module to be alternately conducted so that the first charging loop and the second charging loop alternately work to charge the power battery.
The embodiment of the invention provides a vehicle-mounted charger, which detects the current voltage of a power battery through a voltage detection module when a charging request signal of an external charging device is received through a signal receiving module, and selects to enter a trickle charging mode to charge the power battery to improve the voltage of the power battery when the current voltage of the power battery is judged to be smaller than the minimum threshold voltage of the vehicle-mounted charger through a control module, so that the problems that the uncontrollable rectification phenomenon and possible damage to a power tube in the vehicle-mounted charger are caused due to the fact that a large voltage difference is formed between the output voltage of the vehicle-mounted charger and the current voltage of the power battery are avoided, the safety of the vehicle-mounted charger in the charging process of the power battery is improved, and the small vehicle anchor phenomenon that the power battery cannot be charged is avoided.
Another embodiment of this application provides a vehicle, and the vehicle includes above-mentioned on-vehicle charger and power battery, and the on-vehicle charger is connected power battery.
Further, the vehicle also comprises a battery management system, a vehicle body controller and a vehicle control unit;
the vehicle-mounted charger sends a trickle charging instruction to the battery management system, the vehicle body controller and the vehicle controller, the battery management system drives the pre-charging circuit to work according to the trickle charging instruction and sends a feedback signal to the vehicle controller, the vehicle body controller conducts trickle charging mode power distribution according to the trickle charging instruction and sends a feedback signal to the vehicle controller, and the vehicle controller sends a control instruction for entering the trickle charging mode to the vehicle-mounted charger according to the feedback signal.
The application provides a vehicle, through the mutual cooperation work between on-vehicle charger, battery management system, automobile body controller and the vehicle control unit, when the current voltage of power battery is less than the minimum threshold voltage of on-vehicle charger, select to enter trickle charge mode and charge to power battery in order to improve power battery voltage, avoid because form great pressure differential between the output voltage of on-vehicle charger and the current voltage of power battery, and then lead to the power pipe in the on-vehicle charger to appear uncontrollable rectification phenomenon and probably damage the problem of power pipe.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. For a person skilled in the art to which the present application pertains, several equivalent alternatives or obvious modifications, all of which have the same properties or uses, without departing from the concept of the present application, shall be deemed to belong to the patent protection scope of the present application, as determined by the claims submitted.
Claims (8)
1. A charging method of an on-vehicle charger, wherein the on-vehicle charger is connected with a power battery, and the charging method comprises the following steps:
detecting the current voltage of the power battery when receiving a charging request signal of an external charging device;
judging whether the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger or not;
when the current voltage of the power battery is not lower than the minimum threshold voltage of the vehicle-mounted charger, entering a normal charging mode to charge the power battery;
when the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger, entering a trickle charging mode to charge the power battery until the voltage of the power battery reaches the minimum threshold voltage of the vehicle-mounted charger, and when the voltage of the power battery reaches the minimum threshold voltage, entering a normal charging mode to charge the power battery;
wherein the entering into the trickle charge mode charges the power battery, further comprising:
and connecting the two ends of the power battery in parallel with a voltage limiting resistor to limit the voltage of the power battery to be a preset voltage.
2. The charging method of claim 1, wherein said entering into a trickle charge mode to charge said power battery further comprises:
the vehicle-mounted charger sends a trickle charging instruction to a battery management system, a vehicle body controller and a vehicle controller, the battery management system drives a pre-charging circuit to work according to the trickle charging instruction and sends a feedback signal to the vehicle controller, the vehicle body controller conducts trickle charging mode power distribution according to the trickle charging instruction and sends a feedback signal to the vehicle controller, and the vehicle controller sends a control instruction for entering a trickle charging mode to the vehicle-mounted charger according to the feedback signal.
3. The charging method according to claim 1, wherein the on-board charger comprises an energy storage module, a first switch module and a second switch module, the external charging device, the energy storage module and the first switch module form a first charging loop, and the external charging device, the energy storage module, the second switch module and the power battery form a second charging loop;
the entering of the normal charging mode is used for charging the power battery, and the method further comprises the following steps:
and controlling the first switch module and the second switch module to be conducted alternately to enable the first charging loop and the second charging loop to work alternately so as to charge the power battery.
4. An on-vehicle charger, characterized in that the on-vehicle charger comprises:
the signal receiving module is used for receiving a charging request signal of external charging equipment;
the voltage detection module is used for detecting the current voltage of the power battery;
the control module is used for judging whether the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger or not; when the current voltage of the power battery is not lower than the minimum threshold voltage of the vehicle-mounted charger, entering a normal charging mode to charge the power battery; when the current voltage of the power battery is lower than the minimum threshold voltage of the vehicle-mounted charger, entering a trickle charging mode to charge the power battery until the voltage of the power battery reaches the minimum threshold voltage of the vehicle-mounted charger, and when the voltage of the power battery reaches the minimum threshold voltage, entering a normal charging mode to charge the power battery;
the control module is also used for enabling two ends of the power battery to be connected with a voltage limiting resistor in parallel so as to limit the voltage of the power battery to be a preset voltage.
5. The vehicle charger of claim 4 wherein the control module is further configured to send a trickle charge command to a battery management system, a vehicle body controller and a vehicle controller, the battery management system drives a pre-charge circuit to operate according to the trickle charge command and sends a feedback signal to the vehicle controller, the vehicle body controller distributes power in the trickle charge mode according to the trickle charge command and sends a feedback signal to the vehicle controller, and the vehicle controller sends a control command to the control module to enter the trickle charge mode according to the feedback signal.
6. The vehicle charger of claim 4, further comprising an energy storage module, a first switch module and a second switch module, wherein the control module connects the first switch module and the second switch module, wherein the external charging device, the energy storage module and the first switch module form a first charging loop, and wherein the external charging device, the energy storage module, the second switch module and the power battery form a second charging loop;
the control module is further configured to:
and controlling the first switch module and the second switch module to be conducted alternately to enable the first charging loop and the second charging loop to work alternately so as to charge the power battery.
7. A vehicle comprising a power battery and an onboard charger as claimed in any one of claims 4 to 6, the onboard charger being connected to the power battery.
8. The vehicle of claim 7, further comprising a battery management system, a body controller, and a vehicle control unit;
the vehicle-mounted charger sends a trickle charging instruction to a battery management system, a vehicle body controller and a vehicle controller, the battery management system drives a pre-charging circuit to work according to the trickle charging instruction and sends a feedback signal to the vehicle controller, the vehicle body controller conducts trickle charging mode power distribution according to the trickle charging instruction and sends a feedback signal to the vehicle controller, and the vehicle controller sends a control instruction for entering a trickle charging mode to the vehicle-mounted charger according to the feedback signal.
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| CN113401006A (en) * | 2021-07-06 | 2021-09-17 | 山东元齐新动力科技有限公司 | Vehicle-mounted lithium battery charging method and system |
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| CN104092271A (en) * | 2014-07-24 | 2014-10-08 | 张新安 | Intelligent lithium battery charger |
| CN105098926B (en) * | 2015-09-10 | 2017-04-19 | 桂林电子科技大学 | Intelligent charging system and charging method applied to power battery |
| CN106891749B (en) * | 2015-12-18 | 2019-09-13 | 比亚迪股份有限公司 | The control method of electric car and its onboard charger and onboard charger |
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