CN113103918A - Control method and system for disconnecting relay - Google Patents
Control method and system for disconnecting relay Download PDFInfo
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- CN113103918A CN113103918A CN202110556339.XA CN202110556339A CN113103918A CN 113103918 A CN113103918 A CN 113103918A CN 202110556339 A CN202110556339 A CN 202110556339A CN 113103918 A CN113103918 A CN 113103918A
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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
-
- 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
-
- 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
-
- 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
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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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 embodiment of the invention provides a control method and a system for opening a relay. The method comprises the following steps: the vehicle control unit sends a direct current preheating electrifying instruction to the battery management system; the battery management system responds to a direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value; the battery management system judges whether the small current value is smaller than a set current value; if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the vehicle control unit; the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system; the battery management system turns off the main positive relay and the main negative relay in response to the permission turn-off request. According to the technical scheme provided by the embodiment of the invention, when the battery pack is preheated, the battery management system disconnects the main positive relay and the main negative relay, so that no current flows into the battery pack, and the service life of the battery is prolonged.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of vehicles, in particular to a control method and a system for disconnecting a relay.
[ background of the invention ]
In the related art, when the electric vehicle is charged quickly by direct current in a cold region in winter, the heating mode of the battery of the vehicle includes only heating and charging while heating. When the heat management mode is heating only, and when the minimum monomer Temperature of the battery is below-20 ℃, if the battery is heated to the Temperature threshold value of the allowable charging Temperature of the battery, the time is at least more than 40 minutes, the main relay of the battery is closed in the process, if the output power of a charging pile, the consumed power of a high-voltage accessory of the whole vehicle and the consumed power of a Positive Temperature Coefficient (PTC) heater fluctuate, the current control is inaccurate, the current flows into a battery pack, the negative electrode of the battery is crystallized, the diaphragm of the battery is damaged, and the service life of the battery is influenced.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a method and a system for controlling a turn-off relay, so as to improve the service life of a battery.
In one aspect, an embodiment of the present invention provides a method for controlling a disconnection relay, including:
the vehicle control unit sends a direct current preheating electrifying instruction to the battery management system;
the battery management system responds to the direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value;
the battery management system judges whether the small current value is smaller than a set current value;
if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the whole vehicle controller;
the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system;
the battery management system turns off a main positive relay and a main negative relay in response to the disconnection permission request.
Optionally, the battery management system, after disconnecting the main positive relay and the main negative relay in response to the request for disconnection permission, includes:
the battery management system sends a relay disconnection signal to the vehicle control unit;
the vehicle control unit responds to the relay disconnection signal and controls enabling of the direct current converter;
and the vehicle control unit controls the heating of the battery pack heater according to the acquired temperature value of the water inlet of the battery pack and the duty ratio of the water pump.
Optionally, the vehicle control unit controls the battery pack heater to heat according to the acquired temperature value of the water inlet of the battery pack and the duty ratio of the water pump, and includes:
the vehicle control unit sends a temperature detection signal to the battery management system;
the battery management system responds to the temperature detection signal and detects the current temperature value of the battery pack;
the battery management system judges whether the current temperature value of the battery pack is greater than or equal to a quick charging temperature threshold value;
if the battery management system judges that the current temperature value of the battery pack is greater than or equal to the quick charging temperature threshold value, sending a voltage regulation signal to a charging pile, wherein the voltage regulation signal comprises the acquired current battery pack voltage value;
the charging pile responds to the voltage regulation signal and generates an output voltage value according to the current battery pack voltage value and a set regulation voltage value;
and the charging pile adjusts the output voltage according to the output voltage value.
Optionally, after the charging pile adjusts the output voltage according to the output voltage value, the charging pile includes:
the charging pile sends the output voltage value to the battery management system;
the battery management system judges whether the output voltage value is greater than or equal to a set voltage value;
if the battery management system judges that the output voltage value is greater than or equal to a set voltage value, sending a high-voltage electrifying request to the vehicle control unit;
the vehicle control unit responds to the high-voltage power-on request and sends a high-voltage power-on instruction to the battery management system;
and the battery management system responds to the high-voltage electrifying instruction, closes the negative relay, closes the pre-charging relay, closes the main positive relay and disconnects the pre-charging relay.
Optionally, before the vehicle control unit sends the dc preheating power-on command to the battery management system, the method includes:
the vehicle control unit sends a charging permission instruction to the battery management system;
the battery management system responds to the charging permission instruction and sends a highest permitted charging voltage value to the charging pile;
the charging pile judges whether the acquired voltage value of the current battery pack is greater than the highest allowable charging voltage value or not;
if the charging pile judges that the acquired voltage value of the current battery pack is smaller than or equal to the highest allowable charging voltage value, whether the acquired vehicle parameters accord with a first set rule is judged;
if the charging pile judges that the acquired vehicle parameters accord with a first set rule, the charging pile sends the acquired charger parameters to the battery management system;
the battery management system judges whether the acquired charger parameters meet a second set rule or not;
and if the battery management system judges that the acquired charger parameters accord with a second set rule, detecting the minimum monomer temperature value.
Optionally, if the battery management system determines that the obtained charger parameter meets a second set rule, after detecting the minimum monomer temperature value, the method includes:
the battery management system judges whether the minimum monomer temperature value is smaller than a set temperature value;
if the battery management system judges that the minimum monomer temperature value is smaller than a set temperature value, sending an enabling request to the vehicle control unit;
the vehicle control unit responds to the enabling request and judges whether the acquired vehicle data meet a third set rule or not;
and if the vehicle controller judges that the acquired vehicle data accord with a third set rule, continuing to execute the step of sending a direct current preheating electrifying instruction to the battery management system by the vehicle controller.
Optionally, the battery management system, in response to the high-voltage power-on command, closing the negative relay, closing the pre-charge relay, closing the main positive relay, and after the pre-charge relay is opened, includes:
the battery management system charges the battery pack according to the acquired high-voltage accessory power consumption value and the acquired charging request power value;
the battery management system acquires a minimum monomer temperature value;
the battery management system judges whether the minimum monomer temperature value is greater than a set monomer temperature value;
if the battery management system judges that the minimum monomer temperature value is greater than the set monomer temperature value, the battery management system sends a working stopping signal to the battery pack heater;
the battery pack heater stops operating in response to the stop signal.
On the other hand, an embodiment of the present invention provides a control system for opening a relay, including: a battery management system and a vehicle control unit;
the battery management system is used for taking a smaller current value of the obtained bus current value and the obtained charging pile output current value as a small current value; judging whether the small current value is smaller than a set current value or not; if the small current value is judged to be smaller than the set current value, a relay disconnection request is sent to the whole vehicle controller;
the vehicle control unit is used for responding to the relay disconnection request and sending a disconnection permission request to the battery management system;
the battery management system is further used for responding to the disconnection permission request, and disconnecting the main positive relay and the main negative relay.
Optionally, the method further comprises: a battery pack heater;
the battery management system is also used for sending a relay disconnection signal to the vehicle control unit;
the vehicle control unit is also used for responding to the relay disconnection signal and controlling the enabling of the direct current converter; and controlling a heater of the battery pack to heat according to the acquired temperature value of the water inlet of the battery pack and the duty ratio value of the water pump.
Optionally, the method further comprises: charging piles;
the vehicle control unit is also used for sending a temperature detection signal to the battery management system;
the battery management system is also used for responding to the temperature detection signal and detecting the current temperature value of the battery pack; judging whether the current temperature value of the battery pack is greater than or equal to a quick charging temperature threshold value or not; if the current temperature value of the battery pack is judged to be larger than or equal to the quick charging temperature threshold value, sending a voltage regulation signal to a charging pile, wherein the voltage regulation signal comprises the acquired current battery pack voltage value;
the charging pile is used for responding to the voltage regulating signal and generating an output voltage value according to the current battery pack voltage value and a set regulating voltage value; and adjusting the output voltage according to the output voltage value.
In the technical scheme of the control method for switching off the relay, provided by the embodiment of the invention, the vehicle control unit sends a direct-current preheating electrifying instruction to the battery management system; the battery management system responds to a direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value; the battery management system judges whether the small current value is smaller than a set current value; if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the vehicle control unit; the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system; the battery management system turns off the main positive relay and the main negative relay in response to the permission turn-off request. According to the technical scheme provided by the embodiment of the invention, when the battery pack is preheated, the battery management system disconnects the main positive relay and the main negative relay, so that no current flows into the battery pack, and the service life of the battery is prolonged.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 inventive labor.
Fig. 1 is a schematic structural diagram of a control system for opening a relay according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method for opening a relay according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for controlling the opening of the relay according to the embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
An embodiment of the present invention provides a control system for opening a relay, and fig. 1 is a schematic structural diagram of the control system for opening a relay, as shown in fig. 1, the system includes: a Battery Management System (BMS) 1 and a Vehicle Control Unit (VCU) 2. The battery management system 1 is connected with the vehicle control unit 2.
The vehicle control unit 2 is configured to send a dc preheating power-on instruction to the battery management system 1.
The battery management system 1 is used for responding to a direct current preheating electrifying instruction, and taking a smaller current value of the obtained bus current value and the charging pile output current value as a small current value; judging whether the small current value is smaller than a set current value or not; and if the small current value is judged to be smaller than the set current value, sending a relay disconnection request to the vehicle control unit 2.
The vehicle control unit 2 is also configured to send a disconnection permission request to the battery management system 1 in response to the relay disconnection request.
The battery management system 1 is also configured to open the main positive relay and the main negative relay in response to the permission opening request.
In the embodiment of the present invention, the system further includes: a battery pack heater 3. The vehicle control unit 2 is connected with the battery pack heater 3.
The battery management system 1 is also configured to send a relay-off signal to the vehicle control unit 2.
The vehicle control unit 2 is also used for responding to the relay disconnection signal and controlling the enabling of the direct current converter; and controlling the battery pack heater 3 to heat according to the acquired temperature value of the water inlet of the battery pack and the duty ratio value of the water pump.
In the embodiment of the present invention, the system further includes: fill electric pile 4. The battery management system 1 is connected with the charging pile 4.
The vehicle control unit 2 is further configured to send a temperature detection signal to the battery management system 1.
The battery management system 1 is also used for responding to the temperature detection signal and detecting the current temperature value of the battery pack; judging whether the current temperature value of the battery pack is greater than or equal to a quick charging temperature threshold value or not; and if the current temperature value of the battery pack is judged to be greater than or equal to the quick charging temperature threshold value, sending a voltage regulation signal to the charging pile 4, wherein the voltage regulation signal comprises the acquired current voltage value of the battery pack.
The charging pile 4 is used for responding to the voltage regulation signal, and generating an output voltage value according to the current voltage value of the battery pack and a set regulation voltage value; and regulating the output voltage according to the output voltage value.
In the embodiment of the present invention, the charging pile 4 includes a Direct Current (DC) charging pile.
In the embodiment of the present invention, the charging pile 4 is further configured to send an output voltage value to the battery management system 1.
The battery management system 1 is also used for judging whether the output voltage value is greater than or equal to a set voltage value; and if the output voltage value is judged to be larger than or equal to the set voltage value, sending a high-voltage electrifying request to the vehicle control unit 2.
The vehicle control unit 2 is further configured to send a high-voltage power-on instruction to the battery management system 1 in response to the high-voltage power-on request.
The battery management system 1 is also configured to close the negative relay, close the pre-charge relay, close the main positive relay, and open the pre-charge relay in response to the high-voltage power-on command.
In the embodiment of the present invention, the vehicle control unit 2 is further configured to send a charging permission instruction to the battery management system 1.
The battery management system 1 is also configured to transmit the maximum allowable charging voltage value to the charging pile 4 in response to the allowable charging instruction.
The charging pile 4 is also used for judging whether the acquired voltage value of the current battery pack is greater than the highest allowable charging voltage value; if the charging pile judges that the acquired voltage value of the current battery pack is smaller than or equal to the highest allowable charging voltage value, whether the acquired vehicle parameters meet a first set rule is judged; and if the acquired vehicle parameters are judged to accord with the first set rule, the acquired charger parameters are sent to the battery management system.
The battery management system 1 is further configured to determine whether the acquired charger parameter meets a second set rule; and if the acquired charger parameters are judged to accord with the second set rule, detecting the minimum monomer temperature value to the battery management system 1.
In the embodiment of the present invention, the battery management system 1 is further configured to determine whether the minimum monomer temperature value is less than a set temperature value; and if the minimum single body temperature value is judged to be smaller than the set temperature value, sending an enabling request to the vehicle control unit 2.
The vehicle control unit 2 is further used for responding to the enabling request and judging whether the acquired vehicle data meet a third set rule; and if the acquired vehicle data are judged to accord with the third set rule, continuing to execute the step of sending a charging permission instruction to the battery management system 1 by the vehicle control unit 2.
In the embodiment of the present invention, the battery management system 1 is connected to the battery pack heater 3.
The battery management system 1 is further configured to charge the battery pack according to the obtained high-voltage accessory power consumption value and the obtained charging request power value; acquiring a minimum monomer temperature value; judging whether the minimum monomer temperature value is greater than a set monomer temperature value or not; and if the minimum monomer temperature value is judged to be greater than the set monomer temperature value, sending a work stopping signal to the battery pack heater 3.
The battery pack heater 3 is configured to stop operating in response to a stop signal.
In the technical scheme provided by the embodiment of the invention, the vehicle control unit sends a direct-current preheating electrifying instruction to the battery management system; the battery management system responds to a direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value; the battery management system judges whether the small current value is smaller than a set current value; if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the vehicle control unit; the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system; the battery management system turns off the main positive relay and the main negative relay in response to the permission turn-off request. According to the technical scheme provided by the embodiment of the invention, when the battery pack is preheated, the battery management system disconnects the main positive relay and the main negative relay, so that no current flows into the battery pack, and the service life of the battery is prolonged.
An embodiment of the present invention provides a method for controlling a turn-off relay, and fig. 2 is a flowchart of the method for controlling the turn-off relay, as shown in fig. 2, the method includes:
and 102, the vehicle control unit sends a direct current preheating electrifying instruction to the battery management system.
And step 104, responding to the direct current preheating electrifying instruction by the battery management system, and taking the smaller current value of the obtained bus current value and the charging pile output current value as a small current value.
In the embodiment of the invention, as an alternative scheme, after receiving a direct current preheating power-on command, the BMS controls the high voltage to close the main negative relay, then closes the pre-charging relay for pre-charging, after receiving a pre-charging completion signal, the BMS closes the main positive relay, opens the pre-charging relay, and then closes the quick-charging relay. The BMS sends a charging preparation message to the charging pile, controls the charging pile to enter a constant voltage mode, requests the charging pile voltage to be +5V of the voltage in the battery, controls the PTC to operate in 2KW power after the VCU receives the high-voltage power-on completion state fed back by the BMS, enables a Motor Controller (MCU), enables a direct-current converter to be in a high-voltage standby state, disables a defrosting and demisting function (Heating, Ventilation and Air Conditioning, HVAC for short), and sends high-voltage accessory consumed power in real time.
In the step, the battery management system acquires the output current value of the charging pile from the charging pile and acquires the bus current value of the battery management system.
And step 106, judging whether the small current value is smaller than the set current value by the battery management system.
In the embodiment of the invention, the set current value can be set according to the actual situation. For example, the current value is set to 5A.
In the embodiment of the invention, if the battery management system judges that the small current value is smaller than the set current value, the battery management system indicates that the battery does not need to be continuously preheated; if the battery management system judges that the small current value is larger than or equal to the set current value, the battery management system indicates that the current input into the battery is large and power-off is needed.
In the embodiment of the invention, if the battery management system judges that the small current value is greater than or equal to the set current value, the process is ended after 30 s.
And step 108, if the battery management system judges that the small current value is smaller than the set current value, sending a relay disconnection request to the vehicle control unit.
And step 110, the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system.
In the embodiment of the invention, after the VCU detects that the main positive relay and the main negative relay are disconnected, the VCU controls the enabling of the direct current converter. At this point, the VCU is able to respond to the HVAC request.
In the technical scheme provided by the embodiment of the invention, the vehicle control unit sends a direct-current preheating electrifying instruction to the battery management system; the battery management system responds to a direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value; the battery management system judges whether the small current value is smaller than a set current value; if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the vehicle control unit; the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system; the battery management system turns off the main positive relay and the main negative relay in response to the permission turn-off request. According to the technical scheme provided by the embodiment of the invention, when the battery pack is preheated, the battery management system disconnects the main positive relay and the main negative relay, so that no current flows into the battery pack, and the service life of the battery is prolonged.
An embodiment of the present invention provides another method for controlling a turn-off relay, and fig. 3 is a flowchart of another method for controlling a turn-off relay, which is provided in the embodiment of the present invention, and as shown in fig. 3, the method includes:
In the embodiment of the present invention, step 202 includes: the BMS receives the charging connection signal indicating that the BMS detects an active connection to CC 2. The BMS wakes up the VCU through a high level, and the VCU wakes up the controller involved in the charging. The Controller participating in charging includes an MCU, a Body Control Module (BCM), and an Electronic Stability Control system (ESC). At this moment, the charging pile sends a charging handshake message to the BMS so that the BMS can recognize the dc charging mode. When the VCU detects that the current vehicle speed is 0, the gear is neutral or parking, and the vehicle is not in fault, the VCU sends a charging permission instruction to the BMS.
And step 204, the battery management system responds to the charging permission instruction and sends the highest permitted charging voltage value to the charging pile.
In this step, the charging pile sends a charging identification message to the BMS and starts insulation detection. And the BMS responds to the charging identification message, sends a battery voltage message to the charging pile, receives an insulation detection passing message sent by the charging pile, responds to the battery voltage message by the charging pile, and judges whether the acquired voltage value of the current battery pack is greater than the highest allowable charging voltage value.
In the embodiment of the invention, if the charging pile judges that the acquired voltage value of the current battery pack is greater than the highest allowable charging voltage value, the current battery pack is indicated to have a higher voltage value and needs to be powered off; if the charging pile judges that the acquired voltage value of the current battery pack is smaller than or equal to the highest allowable charging voltage value, the current battery pack voltage value is lower, and charging can be continued.
In the embodiment Of the invention, the vehicle parameters comprise the voltage Of the power battery, the highest allowable charging current, the highest allowable charging voltage, the highest allowable temperature and the State Of Charge (SOC) Of the power battery. The first setting rule includes: the voltage of the power battery is smaller than a first set threshold value, the highest allowable charging current is smaller than a second set threshold value, the highest allowable charging voltage is smaller than a third set threshold value, the highest allowable temperature is smaller than a fourth set threshold value, and the SOC of the power battery is smaller than a fifth set threshold value. The first setting threshold, the second setting threshold, the third setting threshold, the fourth setting threshold and the fifth setting threshold can be set according to actual conditions.
In the embodiment of the invention, if the charging pile judges that the acquired vehicle parameters meet the first set rule, the charging pile indicates that the vehicle can be charged and can send time synchronization information and a charger output capacity message to the BMS; if the charging pile judges that the acquired vehicle parameters do not accord with the first set rule, the vehicle cannot be charged.
And step 210, the charging pile sends the acquired charger parameters to the battery management system.
In this step, the charging pile acquires stored parameters of the charger.
In the embodiment of the invention, the charger parameters comprise highest output voltage, lowest output voltage, highest output current and lowest output current. The second setting rule includes: the highest output voltage is smaller than a sixth set threshold, the lowest output voltage is larger than a seventh set threshold, the highest output current is smaller than an eighth set threshold, and the lowest output current is larger than a ninth set threshold. The sixth setting threshold, the seventh setting threshold, the eighth setting threshold, and the ninth setting threshold may be set according to actual conditions.
In the embodiment of the invention, if the battery management system judges that the parameters of the charger meet the second set rule, the battery management system indicates that the charging pile can be charged and sends an unprepared message to the charging pile; and if the battery management system judges that the parameters of the charger do not accord with the second set rule, the battery management system indicates that the charging pile can not be charged.
In the embodiment of the invention, the set temperature value can be set according to the actual situation. For example, the set temperature value is 0 ℃.
In the embodiment of the invention, if the battery management system judges that the minimum monomer temperature value is less than the set temperature value, the battery management system indicates that the battery needs to be heated; and if the battery management system judges that the minimum monomer temperature value is greater than or equal to the set temperature value, the battery management system indicates that the battery does not need to be heated.
In the embodiment of the invention, the vehicle data comprises gear information, fault information and vehicle speed information. The third set rule comprises that the gear information is a parking gear, the fault information is no forbidden high-voltage fault information, and the vehicle speed information is less than the set vehicle speed. Wherein the set vehicle speed can be set according to actual conditions, for example, the set vehicle speed is 3 km/h.
In the embodiment of the invention, if the vehicle controller judges that the acquired vehicle data accord with a third set rule, the vehicle controller indicates that the vehicle can be preheated and electrified; and if the vehicle controller judges that the acquired vehicle data do not accord with the third set rule, the vehicle controller indicates that the vehicle cannot be preheated and electrified.
And step 222, the vehicle control unit sends a direct-current preheating electrifying instruction to the battery management system.
And 224, responding to the direct current preheating electrifying instruction by the battery management system, and taking the smaller current value of the obtained bus current value and the charging pile output current value as a small current value.
In the embodiment of the present invention, please refer to step 104 for a detailed description of step 224.
In the embodiment of the present invention, please refer to step 106 for a detailed description of step 226.
And step 230, the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system.
In the embodiment of the present invention, please refer to step 112 for a detailed description of step 232.
And step 234, the battery management system sends a relay disconnection signal to the vehicle control unit.
And step 236, the vehicle control unit responds to the relay disconnection signal and controls the enabling of the direct current converter.
And step 238, controlling the heater of the battery pack to heat by the vehicle controller according to the acquired temperature value of the water inlet of the battery pack and the duty ratio of the water pump.
In this step, vehicle control unit follows BMS and acquires battery package water inlet temperature value and water pump duty cycle value.
As an alternative, the VCU controls the power of the PTC to rise in 20% gradients, each gradient being 20S apart, and sends the high voltage accessory power consumption to the BMS. The BMS can enter a constant current control mode based on a maximum high voltage accessory power consumption request current. For example, the maximum high voltage accessory consumes power of 15 kw.
And step 240, the vehicle control unit sends a temperature detection signal to the battery management system.
In the embodiment of the invention, the quick charging temperature threshold can be set according to the actual situation. For example, the fast charge temperature threshold is 5 ℃.
And step 248, responding to the voltage regulation signal by the charging pile, and generating an output voltage value according to the current voltage value of the battery pack and the set regulation voltage value.
In the embodiment of the invention, the adjusting voltage value can be set according to the actual situation. For example, the adjustment voltage value is set to 5V.
In this step, the current voltage value of the battery pack and the set regulation voltage value are added to generate an output voltage value.
And step 250, the charging pile adjusts the output voltage according to the output voltage value.
And step 252, the charging pile sends an output voltage value to the battery management system.
In the embodiment of the invention, the set voltage value can be set according to the actual situation.
In the embodiment of the invention, if the battery management system judges that the output voltage value is greater than or equal to the set voltage value, the output voltage value meets the high-voltage electrifying requirement; and if the battery management system judges that the output voltage value is smaller than the set voltage value, the battery management system indicates that the output voltage value does not meet the high-voltage electrifying requirement.
And 256, sending a high-voltage power-on request to the vehicle control unit by the battery management system.
And step 258, the vehicle control unit sends a high-voltage power-on instruction to the battery management system in response to the high-voltage power-on request.
And step 260, the battery management system responds to the high-voltage electrifying instruction, closes the negative relay, closes the pre-charging relay, closes the main positive relay and disconnects the pre-charging relay.
And step 262, charging the battery pack by the battery management system according to the acquired high-voltage accessory power consumption value and the acquired charging request power value.
In this step, the battery management system charges the battery pack according to the sum of the power consumption value of the high-voltage accessory and the power value requested for charging.
In the embodiment of the invention, the monomer temperature value can be set according to the actual situation. For example, a monomer temperature value of 15 ℃ is set.
In the embodiment of the invention, if the battery management system judges that the minimum monomer temperature value is greater than the set monomer temperature value, the battery does not need to be heated, and at the moment, the BMS preheating enabling request is converted into disabling; and if the battery management system judges that the minimum monomer temperature value is less than or equal to the set monomer temperature value, the battery management system indicates that the battery needs to be heated.
In step 270, the battery pack heater stops operating in response to the stop signal.
In the technical scheme provided by the embodiment of the invention, the vehicle control unit sends a direct-current preheating electrifying instruction to the battery management system; the battery management system responds to a direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value; the battery management system judges whether the small current value is smaller than a set current value; if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the vehicle control unit; the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system; the battery management system turns off the main positive relay and the main negative relay in response to the permission turn-off request. According to the technical scheme provided by the embodiment of the invention, when the battery pack is preheated, the battery management system disconnects the main positive relay and the main negative relay, so that no current flows into the battery pack, and the service life of the battery is prolonged.
According to the technical scheme provided by the embodiment of the invention, when the battery is heated in the heating-only mode, the system is controlled to be in a high-voltage shutdown state, and then the main relay is switched off to heat. After the battery is heated, the main relay is controlled to be closed to enter a heating mode while charging, and the risk that the power battery is damaged due to the fact that the main relay is closed for a long time in the preheating process and current fluctuates and flows through the battery pack is avoided.
In the technical scheme provided by the embodiment of the invention, because the main relay is switched off, the problem of power fluctuation of the battery pack heater in the preheating process is not needed to be worried about, the battery pack heater can run at full power, the preheating process is faster and shorter, and the preheating efficiency of the battery is improved.
According to the technical scheme provided by the embodiment of the invention, the battery pack is not connected with high voltage in the battery preheating process, so that the safety risk is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A control method for opening a relay, comprising:
the vehicle control unit sends a direct current preheating electrifying instruction to the battery management system;
the battery management system responds to the direct current preheating electrifying instruction, and the smaller current value of the obtained bus current value and the charging pile output current value is used as a small current value;
the battery management system judges whether the small current value is smaller than a set current value;
if the battery management system judges that the small current value is smaller than the set current value, a relay disconnection request is sent to the whole vehicle controller;
the vehicle control unit responds to the relay disconnection request and sends a disconnection permission request to the battery management system;
the battery management system turns off a main positive relay and a main negative relay in response to the disconnection permission request.
2. The method of claim 1, wherein the battery management system, after opening a main positive relay and a main negative relay in response to the allow open request, comprises:
the battery management system sends a relay disconnection signal to the vehicle control unit;
the vehicle control unit responds to the relay disconnection signal and controls enabling of the direct current converter;
and the vehicle control unit controls the heating of the battery pack heater according to the acquired temperature value of the water inlet of the battery pack and the duty ratio of the water pump.
3. The method according to claim 2, wherein the vehicle control unit controls the heating of the battery pack heater according to the acquired temperature value of the water inlet of the battery pack and the duty ratio value of the water pump, and the method comprises the following steps:
the vehicle control unit sends a temperature detection signal to the battery management system;
the battery management system responds to the temperature detection signal and detects the current temperature value of the battery pack;
the battery management system judges whether the current temperature value of the battery pack is greater than or equal to a quick charging temperature threshold value;
if the battery management system judges that the current temperature value of the battery pack is greater than or equal to the quick charging temperature threshold value, sending a voltage regulation signal to a charging pile, wherein the voltage regulation signal comprises the acquired current battery pack voltage value;
the charging pile responds to the voltage regulation signal and generates an output voltage value according to the current battery pack voltage value and a set regulation voltage value;
and the charging pile adjusts the output voltage according to the output voltage value.
4. The method of claim 3, wherein the charging post adjusting the output voltage according to the output voltage value comprises:
the charging pile sends the output voltage value to the battery management system;
the battery management system judges whether the output voltage value is greater than or equal to a set voltage value;
if the battery management system judges that the output voltage value is greater than or equal to a set voltage value, sending a high-voltage electrifying request to the vehicle control unit;
the vehicle control unit responds to the high-voltage power-on request and sends a high-voltage power-on instruction to the battery management system;
and the battery management system responds to the high-voltage electrifying instruction, closes the negative relay, closes the pre-charging relay, closes the main positive relay and disconnects the pre-charging relay.
5. The method according to claim 1, wherein before the vehicle control unit sends the dc warm-up power-on command to the battery management system, the method comprises:
the vehicle control unit sends a charging permission instruction to the battery management system;
the battery management system responds to the charging permission instruction and sends a highest permitted charging voltage value to the charging pile;
the charging pile judges whether the acquired voltage value of the current battery pack is greater than the highest allowable charging voltage value or not;
if the charging pile judges that the acquired voltage value of the current battery pack is smaller than or equal to the highest allowable charging voltage value, whether the acquired vehicle parameters accord with a first set rule is judged;
if the charging pile judges that the acquired vehicle parameters accord with a first set rule, the charging pile sends the acquired charger parameters to the battery management system;
the battery management system judges whether the acquired charger parameters meet a second set rule or not;
and if the battery management system judges that the acquired charger parameters accord with a second set rule, detecting the minimum monomer temperature value.
6. The method according to claim 5, wherein the step of, if the battery management system determines that the acquired charger parameter meets the second set rule, detecting the minimum cell temperature value comprises:
the battery management system judges whether the minimum monomer temperature value is smaller than a set temperature value;
if the battery management system judges that the minimum monomer temperature value is smaller than a set temperature value, sending an enabling request to the vehicle control unit;
the vehicle control unit responds to the enabling request and judges whether the acquired vehicle data meet a third set rule or not;
and if the vehicle controller judges that the acquired vehicle data accord with a third set rule, continuing to execute the step of sending a direct current preheating electrifying instruction to the battery management system by the vehicle controller.
7. The method of claim 4, wherein the battery management system, in response to the high voltage power-up command, closing a negative relay, closing a pre-charge relay, closing a main positive relay, and after opening a pre-charge relay, comprises:
the battery management system charges the battery pack according to the acquired high-voltage accessory power consumption value and the acquired charging request power value;
the battery management system acquires a minimum monomer temperature value;
the battery management system judges whether the minimum monomer temperature value is greater than a set monomer temperature value;
if the battery management system judges that the minimum monomer temperature value is greater than the set monomer temperature value, the battery management system sends a working stopping signal to the battery pack heater;
the battery pack heater stops operating in response to the stop signal.
8. A control system for opening a relay, comprising: a battery management system and a vehicle control unit;
the battery management system is used for taking a smaller current value of the obtained bus current value and the obtained charging pile output current value as a small current value; judging whether the small current value is smaller than a set current value or not; if the small current value is judged to be smaller than the set current value, a relay disconnection request is sent to the whole vehicle controller;
the vehicle control unit is used for responding to the relay disconnection request and sending a disconnection permission request to the battery management system;
the battery management system is further used for responding to the disconnection permission request, and disconnecting the main positive relay and the main negative relay.
9. The system of claim 8, further comprising: a battery pack heater;
the battery management system is also used for sending a relay disconnection signal to the vehicle control unit;
the vehicle control unit is also used for responding to the relay disconnection signal and controlling the enabling of the direct current converter; and controlling a heater of the battery pack to heat according to the acquired temperature value of the water inlet of the battery pack and the duty ratio value of the water pump.
10. The method of claim 9, further comprising: charging piles;
the vehicle control unit is also used for sending a temperature detection signal to the battery management system;
the battery management system is also used for responding to the temperature detection signal and detecting the current temperature value of the battery pack; judging whether the current temperature value of the battery pack is greater than or equal to a quick charging temperature threshold value or not; if the current temperature value of the battery pack is judged to be larger than or equal to the quick charging temperature threshold value, sending a voltage regulation signal to a charging pile, wherein the voltage regulation signal comprises the acquired current battery pack voltage value;
the charging pile is used for responding to the voltage regulating signal and generating an output voltage value according to the current battery pack voltage value and a set regulating voltage value; and adjusting the output voltage according to the output voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110556339.XA CN113103918A (en) | 2021-05-21 | 2021-05-21 | Control method and system for disconnecting relay |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110556339.XA CN113103918A (en) | 2021-05-21 | 2021-05-21 | Control method and system for disconnecting relay |
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| CN113103918A true CN113103918A (en) | 2021-07-13 |
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| CN202110556339.XA Pending CN113103918A (en) | 2021-05-21 | 2021-05-21 | Control method and system for disconnecting relay |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290957A (en) * | 2021-12-30 | 2022-04-08 | 上海洛轲智能科技有限公司 | Control method and device for switching off quick charge relay and electronic equipment |
| CN117067976A (en) * | 2023-05-23 | 2023-11-17 | 小米汽车科技有限公司 | Charging control method and device, charging pile and vehicle |
| CN117067976B (en) * | 2023-05-23 | 2024-04-30 | 小米汽车科技有限公司 | Charging control method and device, charging pile and vehicle |
-
2021
- 2021-05-21 CN CN202110556339.XA patent/CN113103918A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290957A (en) * | 2021-12-30 | 2022-04-08 | 上海洛轲智能科技有限公司 | Control method and device for switching off quick charge relay and electronic equipment |
| CN114290957B (en) * | 2021-12-30 | 2024-02-02 | 上海洛轲智能科技有限公司 | Control method and device for opening quick charging relay and electronic equipment |
| CN117067976A (en) * | 2023-05-23 | 2023-11-17 | 小米汽车科技有限公司 | Charging control method and device, charging pile and vehicle |
| CN117067976B (en) * | 2023-05-23 | 2024-04-30 | 小米汽车科技有限公司 | Charging control method and device, charging pile and vehicle |
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