CN108032753B - Preheating charging device for electric automobile and method for preheating and charging battery pack by adopting same - Google Patents

Preheating charging device for electric automobile and method for preheating and charging battery pack by adopting same Download PDF

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Publication number
CN108032753B
CN108032753B CN201711311062.4A CN201711311062A CN108032753B CN 108032753 B CN108032753 B CN 108032753B CN 201711311062 A CN201711311062 A CN 201711311062A CN 108032753 B CN108032753 B CN 108032753B
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preheating
battery pack
charging
converter
executing
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CN108032753A (en
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吴晓刚
王文博
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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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
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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]
    • 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
    • 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
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • 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
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

A preheating charging device for an electric automobile and a method for preheating and charging a battery pack by adopting the preheating charging device relate to the field of charging and controlling of the electric automobile. The charging device solves the problems that the charging time is shortened by a constant-current and constant-voltage charging mode of the conventional charging device for the electric automobile, and the charging efficiency is low under a low-temperature condition. The charging device comprises a DC/DC converter, a controller, a battery management system and a preheating device; the preheating device is used for preheating the battery pack; a battery management system for collecting temperature T and SOC information SOC of the battery packBAnd SOC information SOC of power supply in preheating deviceSCAnd sending a control command to the controller; the controller is used for controlling the DC/DC converter according to the received control instruction so as to realize energy conversion between the battery pack and the preheating device; and the controller is also used for controlling the on and off of the preheating device. The preheating device is used for preheating the battery of the electric automobile.

Description

Preheating charging device for electric automobile and method for preheating and charging battery pack by adopting same
Technical Field
The invention relates to the field of electric automobile charging and control.
Background
With the popularization of electric vehicles, the charging technology of electric vehicles is also increasingly developed. At present, whether a charging pile or some portable chargers are adopted, the charging method of firstly constant current and then constant voltage is adopted most widely. The method has good charging effect, but the charging time is greatly limited due to the existence of the constant voltage stage. In addition, since the battery pack of the electric vehicle has certain requirements on the temperature of the battery, and under the low-temperature condition, due to the limitation of places and the like, some charging places cannot provide proper temperature conditions for the electric vehicle.
In the case of the temperature problem of battery charging under the low temperature condition, the temperature of the battery needs to be raised, and charging current is applied correspondingly, so that the high-power quick-charging device cannot play a role in quick charging.
Disclosure of Invention
The invention provides a preheating charging device for an electric automobile and a method for preheating and charging a battery pack by adopting the same, aiming at solving the problems that the conventional charging device for the electric automobile is firstly charged by constant current and then constant voltage, so that the shortening of the charging time is limited, and the charging efficiency is low under the low-temperature condition.
A preheating charging device for an electric automobile comprises a DC/DC converter, a controller, a battery management system and a preheating device;
the preheating device is used for preheating the battery pack;
a battery management system for collecting temperature T and SOC information SOC of the battery packBAnd SOC information SOC of power supply in preheating deviceSCAnd sending a control command to the controller;
the controller is used for controlling the DC/DC converter according to the received control instruction so as to realize energy conversion between the battery pack and the preheating device;
and the controller is also used for controlling the on and off of the preheating device.
Preferably, the preheating device comprises a fan, a heating resistor, a super capacitor and a switch K1;
the fan and the heating resistor are fixed in the box body in which the battery pack is arranged;
the super capacitor supplies power to the fan and the heating resistor through a switch K1;
the fan is used for enabling the heating resistor to generate heat to be uniformly diffused into the box body in which the battery pack is arranged;
the controller controls the switch K1;
the super capacitor is used as a power supply of the preheating device.
Preferably, the device further comprises an AC/DC converter;
an alternating current power supply of the charging station charges the battery pack through the AC/DC converter and the DC/DC converter in sequence;
and the controller is also used for controlling the power supply mode of the AC/DC converter.
The method for preheating the battery pack by adopting the preheating charging device for the electric automobile comprises the following steps:
step one by step: SOC (state of charge) of super capacitor acquired by battery management systemSCValue, and determining SOCSCWhether the value is less than the threshold lambda1If yes, executing the first step and the second step, and if not, executing the first step and the sixth step;
the first step is: enabling the K1 to be in an off state, and executing a step one and a step three;
step one is three: battery management system collects SOC of battery packBValue, and determining SOCBWhether the value is equal to or greater than a threshold lambda2If yes, executing the step one fourth, and if not, executing the step one seventh;
step one is: controlling the DC/DC converter to work through the controller, and enabling the battery pack to charge a power supply in the preheating device for 10 seconds through the DC/DC converter;
step one and five: collecting SOC of power supply in preheating device through battery management system againSCValue, and determining SOCSCWhether or not the value is equal to or greater than λ1If so, stopping the DC/DC converter, executing a sixth step, and if not, executing a fourth step;
step one is six: the battery management system collects the temperature T of the battery pack and judges whether the value of the temperature T is greater than or equal to a temperature threshold value T1, if yes, the first step and the seventh step are executed, if not, the K1 is closed, the preheating device starts to work, the battery pack is preheated for 10 seconds, and then the execution steps are returned one by one;
step one and step seven: k1 is disconnected, the preheating device keeps a non-working state, and preheating is finished.
Preferably, said λ1Is taken to be 0.7, lambda2Is 0.4 and T1 is 0 ℃.
The method for charging the battery pack by adopting the preheating charging device for the electric automobile comprises the following steps:
firstly, preheating a battery pack through a preheating device;
and secondly, after preheating is finished, the alternating current power supply of the charging station sequentially passes through the AC/DC converter and the DC/DC converter to charge the battery pack.
Preferably, the specific process of preheating the battery pack by the preheating device is as follows:
step two, firstly: SOC (state of charge) of super capacitor acquired by battery management systemSCValue, and determining SOCSCWhether the value is less than the threshold lambda1If yes, executing the second step, and if not, executing the sixth step;
step two: enabling the K1 to be in an off state, and executing a step two;
step two and step three: battery management system collects SOC of battery packBValue, and determining SOCBWhether the value is equal to or greater than a threshold lambda2If yes, executing the fourth step, and if not, executing the seventh step;
step two, four: controlling the DC/DC converter to work through the controller, enabling the battery pack to charge a power supply in the preheating device for 10 seconds through the DC/DC converter, and executing a fifth step;
step two and step five: collecting SOC of power supply in preheating device through battery management system againSCValue, and determining SOCSCWhether or not the value is equal to or greater than λ1If so, stopping the DC/DC converter, executing a sixth step, and if not, executing a fourth step;
step two, step six: the battery management system collects the temperature T of the battery pack and judges whether the value of the temperature T is greater than or equal to a temperature threshold value T1, if yes, K1 is disconnected, the preheating device keeps a non-working state, preheating is finished, if not, K1 is closed, the preheating device starts to work, the battery pack is preheated for 10 seconds, and the first step is executed;
step two, seven: the controller controls the AC/DC converter to work, so that the alternating current power supply of the charging station performs alternating current and direct current conversion through the AC/DC converter and then supplies power to the power supply in the preheating device, and the second eight step is executed until the charging is finished;
step two eight: and after the controller controls the AC/DC converter to stop working, executing step two and step six.
Preferably, said λ1Is taken to be 0.7, lambda2Is 0.4 and T1 is 0 ℃.
The preheating charging device for the electric automobile and the method for preheating and charging the battery pack by adopting the preheating charging device have the advantages that the optimal charging current in the current stage can be intelligently optimized according to the current state parameters of the battery, the charging time is shortened, and the attenuation is controlled as far as possible.
Meanwhile, the battery pack preheating device can also realize the preheating function of the battery pack at low temperature, the battery temperature can be firstly raised to the proper temperature before the battery pack is charged, and then the battery pack is charged by the optimized current, so that the charging time is greatly saved, meanwhile, the use limitation of the charging device under the low temperature condition is solved, the battery pack is preheated and then charged, and the charging efficiency is improved by more than 20%.
The preheating charging device for the electric automobile is simple in structure, can optimize a charging strategy by using a dynamic programming algorithm, can effectively shorten the charging time, and prolongs the cycle life; meanwhile, the low-temperature preheating function is added, so that the charging device has good applicability under the low-temperature condition.
Drawings
Fig. 1 is a schematic block diagram of a preheating charging device for an electric vehicle according to the present invention;
fig. 2 is a flowchart of a method for preheating a battery pack by using a preheating charging device for an electric vehicle according to a fourth embodiment of the present invention;
fig. 3 is a flowchart of a method for charging a battery pack by using a preheating charging device for an electric vehicle according to a sixth embodiment of the present invention;
fig. 4 is a flowchart illustrating preheating of the battery pack 1 by the preheating device 2 according to the seventh embodiment.
Detailed Description
The first embodiment is as follows: referring to fig. 1, the preheating charging device for an electric vehicle according to the present embodiment includes a DC/DC converter 3, a controller 4, a battery management system 5, and a preheating device 2;
the preheating device 2 is used for preheating the battery pack 1;
a battery management system 5 for collecting the temperature T and SOC information SOC of the battery pack 1BAnd SOC information SOC of the power supply in the preheating device 2SCAnd sends out a control command to the controller 4;
a controller 4 for controlling the DC/DC converter 3 according to the received control command, thereby realizing energy conversion between the battery pack 1 and the preheating device 2;
the controller 4 is also used for controlling the on/off of the preheating device 2.
In the present embodiment, the battery management system 5 may also be based on the SOCBAnd sending a corresponding control instruction to the controller to optimize the charging current of the battery pack 1, wherein the battery management system 5 can perform multi-objective optimization by using a dynamic programming algorithm to determine a charging strategy, and the optimization objective is battery loss and charging time. Battery life and charging time may be optimized targets.
The invention can realize the preheating of the battery pack at low temperature and the implementation of the charging control strategy based on the algorithm.
The second embodiment is as follows: referring to fig. 1, the embodiment is described, and the embodiment is different from the preheating charging device for electric vehicles according to the first embodiment in that,
the preheating device 2 comprises a fan 2-1, a heating resistor 2-2, a super capacitor 2-3 and a switch K1;
the fan 2-1 and the heating resistor 2-2 are fixed in a box body in which the battery pack 1 is arranged;
the super capacitor 2-3 supplies power to the fan 2-1 and the heating resistor 2-2 through a switch K1;
the fan 2-1 is used for enabling the heating resistor 2-2 to generate heat to be uniformly diffused into the box body where the battery pack 1 is located;
the controller 4 controls the switch K1;
wherein, the super capacitor 2-3 is used as the power supply of the preheating device 2.
In the present embodiment, the preheating device 2 can improve the uniformity of the preheating of the battery pack. When the battery pack 1 supplies power to the super capacitor 2-3, the preheating uniformity can be embodied in two aspects, namely, the preheating device 2 heats, and when the battery pack 1 supplies power to the super capacitor 2-3, the inside of the battery pack 1 also generates heat, so that the battery pack 1 can combine internal heating with external heating, and the heating uniformity is improved.
The third concrete implementation mode: referring to fig. 1, the present embodiment is described, and the present embodiment differs from the second embodiment in that the preheating charging device for an electric vehicle further includes an AC/DC converter 6;
an alternating current power supply of the charging station charges the battery pack 1 through the AC/DC converter 6 and the DC/DC converter 3 in sequence;
the controller 4 is also used to control the power supply method of the AC/DC converter 6.
In this embodiment, the AC/DC converter may also use a switching power supply or other components capable of outputting constant power and adjusting the value of the constant power.
The fourth concrete implementation mode: referring to fig. 1 and fig. 2, the embodiment is described, and a method for preheating a battery pack by using a preheating charging device for an electric vehicle according to the second embodiment includes the following steps:
the method comprises the following steps: the battery management system 5 acquires the SOC of the super capacitor 2-3SCValue, and determining SOCSCWhether the value is less than the threshold lambda1If yes, executing the first step and the second step, and if not, executing the first step and the sixth step;
the first step is: enabling the K1 to be in an off state, and executing a step one and a step three;
step one is three: the battery management system 5 acquires the SOC of the battery pack 1BValue, and determining SOCBWhether the value is equal to or greater than a threshold lambda2If yes, executing the step one fourth, and if not, executing the step one seventh;
step one is: the controller 4 controls the DC/DC converter 3 to work, so that the battery pack 1 charges a power supply in the preheating device 2 for 10 seconds through the DC/DC converter 3;
step one and five: the SOC of the power supply in the preheating device 2 is collected again through the battery management system 5SCValue, and determining SOCSCWhether or not the value is equal to or greater than λ1If so, stopping the DC/DC converter 3 and executing the step one sixth, and if not, executing the step one fourth;
step one is six: the battery management system 5 acquires the temperature T of the battery pack 1, judges whether the value of the temperature T is greater than or equal to a temperature threshold value T1, if so, executes the first step seven, if not, closes the K1, starts the preheating device 2 to work, preheats the battery pack 1 for 10 seconds, and then returns to the execution steps one by one;
step one and step seven: k1 is disconnected, the preheating device 2 is kept in a non-working state, and the preheating is finished.
In this embodiment, the method for preheating the battery pack may preheat the battery pack in advance, so as to facilitate starting of the electric vehicle.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1 and 3, and the method for preheating a battery pack using a preheating charging apparatus for an electric vehicle according to the present embodiment differs from the fourth embodiment in that λ1Is taken to be 0.7, lambda2Is 0.4 and T1 is 0 ℃.
The sixth specific implementation mode: referring to fig. 1 and 3, the embodiment is described, and a method for charging a battery pack by using a preheating charging device for an electric vehicle according to a third embodiment includes the following steps:
firstly, preheating a battery pack 1 by a preheating device 2;
next, after the preheating is completed, the charging station AC power supply charges the battery pack 1 through the AC/DC converter 6 and the DC/DC converter 3 in this order.
In the embodiment, firstly, the battery pack 1 is preheated by the preheating device 2, and then the charging process is performed, so that the charging efficiency is effectively improved, and the charging efficiency is improved by more than 20%.
The seventh embodiment: the present embodiment is described with reference to fig. 1, 3 and 4, and the method for charging the battery pack using the preheating charging device for an electric vehicle according to the sixth embodiment is different from the method for charging the battery pack using the preheating charging device for an electric vehicle according to the sixth embodiment in that the preheating process of the battery pack 1 by the preheating device 2 includes:
step two, firstly: the battery management system 5 acquires the SOC of the super capacitor 2-3SCValue, and determining SOCSCWhether the value is less than the threshold lambda1If yes, executing the second step, and if not, executing the sixth step;
step two: enabling the K1 to be in an off state, and executing a step two;
step two and step three: the battery management system 5 acquires the SOC of the battery pack 1BValue, and determining SOCBWhether the value is equal to or greater than a threshold lambda2If yes, executing the fourth step, and if not, executing the seventh step;
step two, four: controlling the DC/DC converter 3 to work through the controller 4, enabling the battery pack 1 to charge a power supply in the preheating device 2 for 10 seconds through the DC/DC converter 3, and executing a fifth step;
step two and step five: the SOC of the power supply in the preheating device 2 is collected again through the battery management system 5SCValue, and determining SOCSCWhether or not the value is equal to or greater than λ1If so, stopping the DC/DC converter 3 and executing the step two six, otherwise, executing the step two four;
step two, step six: the battery management system 5 acquires the temperature T of the battery pack 1 and judges whether the value of the temperature T is greater than or equal to a temperature threshold value T1, if so, K1 is disconnected, the preheating device 2 is kept in a non-working state, the preheating is finished, if not, K1 is closed, the preheating device 2 starts to work, the battery pack 1 is preheated for 10 seconds, and the first step is executed;
step two, seven: the controller 4 controls the AC/DC converter 6 to work, so that the alternating current power supply of the charging station performs alternating current and direct current conversion through the AC/DC converter 6 and then supplies power to the power supply in the preheating device 2, and the second eight step is executed until the charging is finished;
step two eight: after the controller 4 controls the AC/DC converter 6 to stop operating, step two and step six are executed.
The specific implementation mode is eight: the present embodiment, the present embodiment and the concrete embodiment will be described with reference to fig. 1, 3 and 4The method for charging a battery pack using a preheatable charging device for an electric vehicle according to embodiment seven is characterized in that λ1Is taken to be 0.7, lambda2Is 0.4 and T1 is 0 ℃.
The structure of the preheating charging device for an electric vehicle according to the present invention is not limited to the specific structure described in each of the above embodiments, and may be a reasonable combination of the technical features described in each of the above embodiments.

Claims (8)

1. A preheating charging device for an electric automobile comprises a DC/DC converter (3), a controller (4) and a battery management system (5), and is characterized by further comprising a preheating device (2);
the preheating device (2) is used for preheating the battery pack (1);
a battery management system (5) for acquiring temperature T and SOC information SOC of the battery pack (1)BAnd SOC information SOC of the power supply in the preheating device (2)SCAnd sending a control command to the controller (4);
the controller (4) controls the DC/DC converter (3) according to the received control instruction, so that energy conversion between the battery pack (1) and the preheating device (2) is realized;
and the controller (4) is also used for controlling the on and off of the preheating device (2).
2. The preheating charging device for the electric vehicle according to claim 1, wherein the preheating device (2) comprises a fan (2-1), a heating resistor (2-2), a super capacitor (2-3) and a switch K1;
the fan (2-1) and the heating resistor (2-2) are fixed in a box body in which the battery pack (1) is arranged;
the super capacitor (2-3) supplies power to the fan (2-1) and the heating resistor (2-2) through a switch K1;
the fan (2-1) is used for enabling the heating resistor (2-2) to generate heat to be uniformly diffused into the box body where the battery pack (1) is located;
the controller (4) controls the switch K1;
wherein, the super capacitor (2-3) is used as a power supply of the preheating device (2).
3. The preheatable charging device for electric vehicle according to claim 2, further comprising an AC/DC converter (6);
an alternating current power supply of the charging station charges the battery pack (1) through the AC/DC converter (6) and the DC/DC converter (3) in sequence;
and a controller (4) for controlling the power supply mode of the AC/DC converter (6).
4. The method for preheating the battery pack by using the preheating charging device for the electric vehicle as set forth in claim 2, characterized in that the method comprises the steps of:
the method comprises the following steps: the battery management system (5) acquires the SOC of the super capacitor (2-3)SCValue, and determining SOCSCWhether the value is less than the threshold lambda1If yes, executing the first step and the second step, and if not, executing the first step and the sixth step;
the first step is: enabling the K1 to be in an off state, and executing a step one and a step three;
step one is three: the battery management system (5) acquires the SOC of the battery pack (1)BValue, and determining SOCBWhether the value is equal to or greater than a threshold lambda2If yes, executing the step one fourth, and if not, executing the step one seventh;
step one is: the controller (4) controls the DC/DC converter (3) to work, so that the battery pack (1) charges a power supply in the preheating device (2) for 10 seconds through the DC/DC converter (3);
step one and five: the SOC of the power supply in the preheating device (2) is collected again through the battery management system (5)SCValue, and determining SOCSCWhether or not the value is equal to or greater than λ1If so, stopping the DC/DC converter (3) and executing a sixth step, and if not, executing a fourth step;
step one is six: the battery management system (5) collects the temperature T of the battery pack (1), judges whether the value of the temperature T is greater than or equal to a temperature threshold value T1, if yes, executes the first step seven, if not, closes the K1, starts the preheating device (2) to work, preheats the battery pack (1) for 10 seconds, and then returns to the execution steps one by one;
step one and step seven: k1 is disconnected, the preheating device (2) is kept in a non-working state, and preheating is finished.
5. The method for preheating the battery pack using the preheatable charging device for the electric vehicle as set forth in claim 4, wherein λ1Is taken to be 0.7, lambda2Is 0.4 and T1 is 0 ℃.
6. A method for charging a battery pack using the preheatable charging device for electric vehicle of claim 3, comprising the steps of:
firstly, preheating a battery pack (1) through a preheating device (2);
and secondly, after preheating is finished, the alternating current power supply of the charging station sequentially passes through the AC/DC converter (6) and the DC/DC converter (3) to charge the battery pack (1).
7. The method for charging the battery pack by using the preheating charging device for the electric vehicle as claimed in claim 6, wherein the preheating of the battery pack (1) by the preheating device (2) comprises the following steps:
step two, firstly: the battery management system (5) acquires the SOC of the super capacitor (2-3)SCValue, and determining SOCSCWhether the value is less than the threshold lambda1If yes, executing the second step, and if not, executing the sixth step;
step two: enabling the K1 to be in an off state, and executing a step two;
step two and step three: the battery management system (5) acquires the SOC of the battery pack (1)BValue, and determining SOCBWhether the value is equal to or greater than a threshold lambda2If yes, executing the fourth step, and if not, executing the seventh step;
step two, four: controlling the DC/DC converter (3) to work through the controller (4), enabling the battery pack (1) to charge a power supply source in the preheating device (2) for 10 seconds through the DC/DC converter (3), and executing a fifth step;
step two and step five: the SOC of the power supply in the preheating device (2) is collected again through the battery management system (5)SCValue, and determining SOCSCWhether or not the value is equal to or greater than λ1If so, stopping the DC/DC converter (3) and executing a step two six, otherwise, executing a step two four;
step two, step six: the battery management system (5) collects the temperature T of the battery pack (1), judges whether the value of the temperature T is greater than or equal to a temperature threshold value T1, and if yes, the K1 is disconnected, the preheating device (2) is kept in a non-working state, preheating is finished, if not, the K1 is closed, the preheating device (2) starts to work, the battery pack (1) is preheated for 10 seconds, and the second step is executed;
step two, seven: the controller (4) controls the AC/DC converter (6) to work, so that the alternating current power supply of the charging station performs alternating current and direct current conversion through the AC/DC converter (6) and then supplies power to the power supply in the preheating device (2) until charging is completed, and the second eight step is executed;
step two eight: and after the controller (4) controls the AC/DC converter (6) to stop working, executing a step two and a step six.
8. The method of charging a battery pack with a preheatable charging device for an electric vehicle as set forth in claim 7, wherein λ1Is taken to be 0.7, lambda2Is 0.4 and T1 is 0 ℃.
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