CN113103917A - Heating control method for low-temperature direct current charging of electric automobile - Google Patents
Heating control method for low-temperature direct current charging of electric automobile Download PDFInfo
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- CN113103917A CN113103917A CN202110528982.1A CN202110528982A CN113103917A CN 113103917 A CN113103917 A CN 113103917A CN 202110528982 A CN202110528982 A CN 202110528982A CN 113103917 A CN113103917 A CN 113103917A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—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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- 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
Abstract
A heating control method for low-temperature direct current charging of an electric automobile comprises the following steps: the first step is as follows: charging and waking up, and the second step: charging handshake, third step: the electric vehicle charging mode judging process comprises the following steps: a charging pure heating stage, a fifth step: charging while heating, and a sixth step: a pure charging phase. The design can automatically judge the charging mode, realize the heating and charging of the power battery at low temperature, prevent the power battery from being passively charged at low temperature, and effectively improve the heating and charging safety of the power battery.
Description
Technical Field
The invention relates to a charging method, in particular to a heating control method for low-temperature direct-current charging of an electric automobile, which is particularly suitable for auxiliary heating for low-temperature charging of a power battery of the electric automobile.
Background
The electric automobile is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run by using a motor, and meets various requirements of road traffic and safety regulations. Because the influence on the environment is smaller than that of the traditional automobile, the prospect is widely seen. With the continuous development and popularization of new energy automobiles, the requirements of users on the vehicle performance are continuously improved. In northern areas, particularly in cold places in winter, the situation that charging is needed in a low-temperature environment is often encountered, but the low-temperature charging performance of the conventional power battery is poor, and when the temperature of the battery is lower than 0 ℃, the power battery generally needs to be heated to a proper temperature before being charged with high power, so that the battery pack is necessarily heated.
At present, the energy sources of the direct-current charging and pure heating of the electric automobile are 2, and the direct-current charging pile is used for taking electricity and the power battery is used for self-discharging heating. The two heating modes can avoid charging pile output current flowing into the power battery in the low-temperature environment heating process, so that irreversible damage to the power battery is avoided, but the following defects still exist:
1. fill a large amount of electric pile specifications, technical parameter in the current market and have great difference, fill electric pile and can't stabilize the output with electric automobile demand current, its actual output current can appear random fluctuation, if output current is greater than electric motor car demand current, then can be when the heating, partial current charges for power battery, and power battery charges passively under the low temperature to lead to power battery to damage, there is the safety risk.
2. The part fills electric pile and can set up the self preservation and protect the mode, adopts the constant voltage mode to charge, and power battery self-discharge heats the battery, fills electric pile no current output in this stage, and the part fills electric pile setting and lasts 3 minutes and does not have output then shutdown protection, leads to electric automobile to withdraw from the mode of charging, finally leads to charging failure.
3. The heating control can be carried out only when the electric quantity of the battery pack is high, and when the electric quantity is low or no electricity is available, the battery pack cannot be heated, and even cannot be charged due to the fact that the battery pack cannot be heated.
Disclosure of Invention
The invention aims to overcome the defect that the power battery is damaged due to the fact that the power battery is passively charged at a low temperature because the output current of a direct current charging pile is unstable in the prior art, and provides a low-temperature direct current charging pure heating control method for the power battery of the electric automobile, which can automatically select different low-temperature charging pure heating control strategies according to the actual output capacity of the direct current charging pile.
In order to achieve the above purpose, the technical solution of the invention is as follows:
a heating control method for low-temperature direct current charging of an electric automobile comprises the following steps:
the first step is as follows: the method comprises the following steps of charging and awakening, stopping an electric automobile to a charging parking space and powering off, connecting an electric automobile charging gun to a direct-current charging pile after the electric automobile is powered off, outputting a charging and awakening signal by the charging pile to awaken the electric automobile, detecting whether a direct-current charging condition is met or not after the electric automobile controller receives the charging and awakening signal output by the charging pile, executing a second-step charging handshake process with the charging pile if the condition is met, and entering an electric automobile power-on process and repeating the charging and awakening process if the condition is not met;
the second step is that: charging handshake, when the electric automobile meets the direct current charging condition, a charging handshake process is executed, the charging pile sends a charging pile handshake message to the electric automobile controller, when the electric automobile controller successfully receives the charging pile handshake message, the electric automobile controller returns the electric automobile controller handshake message to the charging pile, if the electric automobile controller receives the electric automobile controller handshake message sent by the charging pile, the charging handshake succeeds, after the charging handshake succeeds, the electric automobile controller sends a charging ready message, after the charging handshake receives the charging ready message, a charging ready signal is fed back, the charging handshake process is completed and a third charging mode judgment process is executed, and if the charging pile does not receive the charging ready message, the electric automobile and the charging pile terminate charging;
the third step: the electric automobile mode of charging judges the flow, then electric automobile gets into the flow of charging after electric automobile accomplishes the flow of shaking hands of charging, and electric automobile controller carries out the mode of charging and judges the flow, and electric automobile controller real-time detection is present each group of power battery temperature, judges the mode of charging according to the temperature of the minimum a set of in present each group of power battery:
1) when the lowest temperature of the power battery is less than or equal to 0 ℃, entering a fourth charging pure heating stage,
2) when the lowest temperature of the power battery is higher than 0 ℃ and lower than or equal to 15 ℃, entering a fifth step of charging while heating,
3) when the lowest temperature of the power battery is higher than 15 ℃, entering a pure charging stage in the sixth step;
the fourth step: in the charging pure heating stage, after the charging pure heating stage is started, the electric automobile controller compares the minimum output current of the charging pile with the rated heating current value of the power battery,
if the minimum output current of the charging pile is less than or equal to the rated heating current value of the power battery of 6A, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a constant current mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, meanwhile, the electric automobile controller continuously requests 6A input current for the charging pile until the minimum temperature of each group of power batteries is all more than 0 ℃, and the electric automobile enters a charging and heating stage in the fifth step,
if the minimum output current of the charging pile is larger than the rated heating current value of the power battery by 6A, or the electric automobile controller cannot acquire the minimum output current value of the charging pile, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a reciprocating and circulating mode in a constant-voltage-constant-current alternating mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, and after the minimum temperature of all groups of power batteries is larger than 0 ℃, the electric automobile enters a fifth charging and heating stage;
the fifth step: the charging and heating stage is carried out, after the electric automobile enters the charging and heating stage, the electric automobile obtains small current from the charging pile and simultaneously charges and heats the power batteries, the electric automobile controller detects the temperature of each group of power batteries in real time, and when the lowest temperature of each group of power batteries is all higher than 15 ℃, the electric automobile enters the pure charging stage of the sixth step;
and a sixth step: and in the pure charging stage, after the electric automobile enters the pure charging stage, the electric automobile controller sends a signal to drive the charging pile to output constant current to the electric automobile until the power battery of the electric automobile is fully charged, and at the moment, the charging process of the electric automobile is completed.
The working process of the constant voltage-constant current alternative mode in the charging pure heating stage in the fourth step is as follows: the electric automobile controller sends a signal to drive the power battery and the charging pile to provide electric energy for the power battery heating circuit, and the power battery heating circuit converts the electric energy into heat to continuously heat the power battery; the electric automobile controller controls the power battery heating circuit to be continuously and alternately switched between a constant voltage mode and a constant current mode until the condition of entering a heating stage while charging is met; the constant-voltage mode is that the power battery provides electric energy through self-discharge to heat the power battery, the constant-voltage mode lasts for 1.5 minutes, the constant-current mode is that the charging pile provides 6A input current for the electric automobile heating circuit to heat the power battery, and the constant-current mode lasts for 3 seconds.
The information of the charging pile handshaking messages in the second charging handshaking stage comprises: the maximum allowable total charging voltage, the electric vehicle controller and vehicle identification information.
And in the sixth step, the working process of the pure charging stage is in a constant-current charging mode, the electric automobile controller sends a charging demand to the charging pile, and the charging pile provides constant current which is the same as the charging demand after receiving the charging demand.
The charging requirement includes: a demand voltage, a demand current, and a charging mode.
The electric automobile controller is an electric automobile battery management system.
The first step of charging wake-up direct current charging conditions comprise: the electric automobile detects that the charging wake-up signal, the CC2 charging connection signal and the electric automobile self-checking that fill electric pile output are trouble-free.
If the charging handshake process fails in the second-step charging handshake, the charging pile stops outputting the charging wake-up signal, and meanwhile, the electric automobile sends out a charging failure alarm and goes down to sleep.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention discloses a low-temperature direct-current charging pure heating control method for a power battery of an electric automobile, which utilizes an electric automobile controller to detect the temperature of the power battery in real time, judges a charging mode according to the temperature of the power battery and realizes high-efficiency heating and charging of the power battery under the conditions of low temperature and low electric quantity. Therefore, the design can automatically judge the charging mode, and realize the heating and charging of the power battery at low temperature.
2. According to the low-temperature direct-current charging pure-heating control method for the power battery of the electric automobile, the electric automobile controller can be used for determining the charging mode according to the output current of the charging pile, so that the power battery is prevented from being damaged due to passive charging under the condition that the output current of the charging pile is larger than the request current of the electric automobile. Therefore, the design can prevent the power battery from being passively charged at low temperature, and effectively improves the heating and charging safety of the power battery.
3. In the charging pure heating stage of the low-temperature direct-current charging pure heating control method for the power battery of the electric automobile, the electric automobile controller can realize the reciprocating cycle output of electric energy in a constant-voltage and constant-current alternating mode to heat the power battery, so that the charging pile can be prevented from entering shutdown protection, and the power battery at low temperature can be prevented from being passively charged for a long time to cause battery damage. Therefore, this design is avoided filling electric pile and is not got into the shutdown protection, avoids power battery to charge passively for a long time at low temperature simultaneously, effectively improves electric automobile charge efficiency and improves the security of charging simultaneously.
4. According to the low-temperature direct-current charging pure heating control method for the power battery of the electric automobile, the electric automobile can obtain a small current from the charging pile and simultaneously charge and heat the power battery in the charging and heating stages, the charging efficiency is improved, and the condition that a user waits for a long time outdoors in winter under the extremely cold condition is avoided. Therefore, the efficiency of power battery heating and charging under the low-temperature low-power condition can be effectively improved in this design, and the use comfort of the user is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a flow chart of the control of the dc charging pure heating stage in the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 2, a heating control method for low-temperature dc charging of an electric vehicle includes the following steps:
the first step is as follows: the method comprises the following steps of charging and awakening, stopping an electric automobile to a charging parking space and powering off, connecting an electric automobile charging gun to a direct-current charging pile after the electric automobile is powered off, outputting a charging and awakening signal by the charging pile to awaken the electric automobile, detecting whether a direct-current charging condition is met or not after the electric automobile controller receives the charging and awakening signal output by the charging pile, executing a second-step charging handshake process with the charging pile if the condition is met, and entering an electric automobile power-on process and repeating the charging and awakening process if the condition is not met;
the second step is that: charging handshake, when the electric automobile meets the direct current charging condition, a charging handshake process is executed, the charging pile sends a charging pile handshake message to the electric automobile controller, when the electric automobile controller successfully receives the charging pile handshake message, the electric automobile controller returns the electric automobile controller handshake message to the charging pile, if the electric automobile controller receives the electric automobile controller handshake message sent by the charging pile, the charging handshake succeeds, after the charging handshake succeeds, the electric automobile controller sends a charging ready message, after the charging handshake receives the charging ready message, a charging ready signal is fed back, the charging handshake process is completed and a third charging mode judgment process is executed, and if the charging pile does not receive the charging ready message, the electric automobile and the charging pile terminate charging;
the third step: the electric automobile mode of charging judges the flow, then electric automobile gets into the flow of charging after electric automobile accomplishes the flow of shaking hands of charging, and electric automobile controller carries out the mode of charging and judges the flow, and electric automobile controller real-time detection is present each group of power battery temperature, judges the mode of charging according to the temperature of the minimum a set of in present each group of power battery:
1) when the lowest temperature of the power battery is less than or equal to 0 ℃, entering a fourth charging pure heating stage,
2) when the lowest temperature of the power battery is higher than 0 ℃ and lower than or equal to 15 ℃, entering a fifth step of charging while heating,
3) when the lowest temperature of the power battery is higher than 15 ℃, entering a pure charging stage in the sixth step;
the fourth step: in the charging pure heating stage, after the charging pure heating stage is started, the electric automobile controller compares the minimum output current of the charging pile with the rated heating current value of the power battery,
if the minimum output current of the charging pile is less than or equal to the rated heating current value of the power battery of 6A, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a constant current mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, meanwhile, the electric automobile controller continuously requests 6A input current for the charging pile until the minimum temperature of each group of power batteries is all more than 0 ℃, and the electric automobile enters a charging and heating stage in the fifth step,
if the minimum output current of the charging pile is larger than the rated heating current value of the power battery by 6A, or the electric automobile controller cannot acquire the minimum output current value of the charging pile, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a reciprocating and circulating mode in a constant-voltage-constant-current alternating mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, and after the minimum temperature of all groups of power batteries is larger than 0 ℃, the electric automobile enters a fifth charging and heating stage;
the fifth step: the charging and heating stage is carried out, after the electric automobile enters the charging and heating stage, the electric automobile obtains small current from the charging pile and simultaneously charges and heats the power batteries, the electric automobile controller detects the temperature of each group of power batteries in real time, and when the lowest temperature of each group of power batteries is all higher than 15 ℃, the electric automobile enters the pure charging stage of the sixth step;
and a sixth step: and in the pure charging stage, after the electric automobile enters the pure charging stage, the electric automobile controller sends a signal to drive the charging pile to output constant current to the electric automobile until the power battery of the electric automobile is fully charged, and at the moment, the charging process of the electric automobile is completed.
The working process of the constant voltage-constant current alternative mode in the charging pure heating stage in the fourth step is as follows: the electric automobile controller sends a signal to drive the power battery and the charging pile to provide electric energy for the power battery heating circuit, and the power battery heating circuit converts the electric energy into heat to continuously heat the power battery; the electric automobile controller controls the power battery heating circuit to be continuously and alternately switched between a constant voltage mode and a constant current mode until the condition of entering a heating stage while charging is met; the constant-voltage mode is that the power battery provides electric energy through self-discharge to heat the power battery, the constant-voltage mode lasts for 1.5 minutes, the constant-current mode is that the charging pile provides 6A input current for the electric automobile heating circuit to heat the power battery, and the constant-current mode lasts for 3 seconds.
The information of the charging pile handshaking messages in the second charging handshaking stage comprises: the maximum allowable total charging voltage, the electric vehicle controller and vehicle identification information.
And in the sixth step, the working process of the pure charging stage is in a constant-current charging mode, the electric automobile controller sends a charging demand to the charging pile, and the charging pile provides constant current which is the same as the charging demand after receiving the charging demand.
The charging requirement includes: a demand voltage, a demand current, and a charging mode.
The electric automobile controller is an electric automobile battery management system.
The first step of charging wake-up direct current charging conditions comprise: the electric automobile detects that the charging wake-up signal, the CC2 charging connection signal and the electric automobile self-checking that fill electric pile output are trouble-free.
If the charging handshake process fails in the second-step charging handshake, the charging pile stops outputting the charging wake-up signal, and meanwhile, the electric automobile sends out a charging failure alarm and goes down to sleep.
The principle of the invention is illustrated as follows:
CC2 charging connection signal confirms communication signal for car, the stake connection between electric automobile and the stake of charging, and the concrete function is as follows:
and in the charging process, if the off-board charging equipment does not receive a charging level requirement message periodically sent by the battery management system within 100ms, the off-board charging equipment also responds to the function of closing the output of the direct-current power supply.
Example 1:
a heating control method for low-temperature direct current charging of an electric automobile comprises the following steps:
the first step is as follows: the method comprises the following steps of charging and awakening, stopping an electric automobile to a charging parking space and powering off, connecting an electric automobile charging gun to a direct-current charging pile after the electric automobile is powered off, outputting a charging and awakening signal by the charging pile to awaken the electric automobile, detecting whether a direct-current charging condition is met or not after the electric automobile controller receives the charging and awakening signal output by the charging pile, executing a second-step charging handshake process with the charging pile if the condition is met, and entering an electric automobile power-on process and repeating the charging and awakening process if the condition is not met;
the second step is that: charging handshake, when the electric automobile meets the direct current charging condition, a charging handshake process is executed, the charging pile sends a charging pile handshake message to the electric automobile controller, when the electric automobile controller successfully receives the charging pile handshake message, the electric automobile controller returns the electric automobile controller handshake message to the charging pile, if the electric automobile controller receives the electric automobile controller handshake message sent by the charging pile, the charging handshake succeeds, after the charging handshake succeeds, the electric automobile controller sends a charging ready message, after the charging handshake receives the charging ready message, a charging ready signal is fed back, the charging handshake process is completed and a third charging mode judgment process is executed, and if the charging pile does not receive the charging ready message, the electric automobile and the charging pile terminate charging;
the third step: the electric automobile mode of charging judges the flow, then electric automobile gets into the flow of charging after electric automobile accomplishes the flow of shaking hands of charging, and electric automobile controller carries out the mode of charging and judges the flow, and electric automobile controller real-time detection is present each group of power battery temperature, judges the mode of charging according to the temperature of the minimum a set of in present each group of power battery:
1) when the lowest temperature of the power battery is less than or equal to 0 ℃, entering a fourth charging pure heating stage,
2) when the lowest temperature of the power battery is higher than 0 ℃ and lower than or equal to 15 ℃, entering a fifth step of charging while heating,
3) when the lowest temperature of the power battery is higher than 15 ℃, entering a pure charging stage in the sixth step;
the fourth step: in the charging pure heating stage, after the charging pure heating stage is started, the electric automobile controller compares the minimum output current of the charging pile with the rated heating current value of the power battery,
if the minimum output current of the charging pile is less than or equal to the rated heating current value of the power battery of 6A, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a constant current mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, meanwhile, the electric automobile controller continuously requests 6A input current for the charging pile until the minimum temperature of each group of power batteries is all more than 0 ℃, and the electric automobile enters a charging and heating stage in the fifth step,
if the minimum output current of the charging pile is larger than the rated heating current value of the power battery by 6A, or the electric automobile controller cannot acquire the minimum output current value of the charging pile, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a reciprocating and circulating mode in a constant-voltage-constant-current alternating mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, and after the minimum temperature of all groups of power batteries is larger than 0 ℃, the electric automobile enters a fifth charging and heating stage;
the fifth step: the charging and heating stage is carried out, after the electric automobile enters the charging and heating stage, the electric automobile obtains small current from the charging pile and simultaneously charges and heats the power batteries, the electric automobile controller detects the temperature of each group of power batteries in real time, and when the lowest temperature of each group of power batteries is all higher than 15 ℃, the electric automobile enters the pure charging stage of the sixth step;
and a sixth step: and in the pure charging stage, after the electric automobile enters the pure charging stage, the electric automobile controller sends a signal to drive the charging pile to output constant current to the electric automobile until the power battery of the electric automobile is fully charged, and at the moment, the charging process of the electric automobile is completed.
The working process of the constant voltage-constant current alternative mode in the charging pure heating stage in the fourth step is as follows: the electric automobile controller sends a signal to drive the power battery and the charging pile to provide electric energy for the power battery heating circuit, and the power battery heating circuit converts the electric energy into heat to continuously heat the power battery; the electric automobile controller controls the power battery heating circuit to be continuously and alternately switched between a constant voltage mode and a constant current mode until the condition of entering a heating stage while charging is met; the constant-voltage mode is that the power battery provides electric energy through self-discharge to heat the power battery, the constant-voltage mode lasts for 1.5 minutes, the constant-current mode is that the charging pile provides 6A input current for the electric automobile heating circuit to heat the power battery, and the constant-current mode lasts for 3 seconds.
The information of the charging pile handshaking messages in the second charging handshaking stage comprises: the maximum allowable total charging voltage, the electric vehicle controller and vehicle identification information.
And in the sixth step, the working process of the pure charging stage is in a constant-current charging mode, the electric automobile controller sends a charging demand to the charging pile, and the charging pile provides constant current which is the same as the charging demand after receiving the charging demand.
The charging requirement includes: a demand voltage, a demand current, and a charging mode.
The electric automobile controller is an electric automobile battery management system.
Example 2:
the first step of charging wake-up direct current charging conditions comprise: the electric automobile detects that the charging wake-up signal, the CC2 charging connection signal and the electric automobile self-checking that fill electric pile output are trouble-free.
Example 3:
if the charging handshake process fails in the second-step charging handshake, the charging pile stops outputting the charging wake-up signal, and meanwhile, the electric automobile sends out a charging failure alarm and goes down to sleep.
Claims (8)
1. A heating control method for low-temperature direct current charging of an electric automobile is characterized by comprising the following steps:
the control method comprises the following steps:
the first step is as follows: the method comprises the following steps of charging and awakening, stopping an electric automobile to a charging parking space and powering off, connecting an electric automobile charging gun to a direct-current charging pile after the electric automobile is powered off, outputting a charging and awakening signal by the charging pile to awaken the electric automobile, detecting whether a direct-current charging condition is met or not after the electric automobile controller receives the charging and awakening signal output by the charging pile, executing a second-step charging handshake process with the charging pile if the condition is met, and entering an electric automobile power-on process and repeating the charging and awakening process if the condition is not met;
the second step is that: charging handshake, when the electric automobile meets the direct current charging condition, a charging handshake process is executed, the charging pile sends a charging pile handshake message to the electric automobile controller, when the electric automobile controller successfully receives the charging pile handshake message, the electric automobile controller returns the electric automobile controller handshake message to the charging pile, if the electric automobile controller receives the electric automobile controller handshake message sent by the charging pile, the charging handshake succeeds, after the charging handshake succeeds, the electric automobile controller sends a charging ready message, after the charging handshake receives the charging ready message, a charging ready signal is fed back, the charging handshake process is completed and a third charging mode judgment process is executed, and if the charging pile does not receive the charging ready message, the electric automobile and the charging pile terminate charging;
the third step: the electric automobile mode of charging judges the flow, then electric automobile gets into the flow of charging after electric automobile accomplishes the flow of shaking hands of charging, and electric automobile controller carries out the mode of charging and judges the flow, and electric automobile controller real-time detection is present each group of power battery temperature, judges the mode of charging according to the temperature of the minimum a set of in present each group of power battery:
1) when the lowest temperature of the power battery is less than or equal to 0 ℃, entering a fourth charging pure heating stage,
2) when the lowest temperature of the power battery is higher than 0 ℃ and lower than or equal to 15 ℃, entering a fifth step of charging while heating,
3) when the lowest temperature of the power battery is higher than 15 ℃, entering a pure charging stage in the sixth step;
the fourth step: in the charging pure heating stage, after the charging pure heating stage is started, the electric automobile controller compares the minimum output current of the charging pile with the rated heating current value of the power battery,
if the minimum output current of the charging pile is less than or equal to the rated heating current value of the power battery of 6A, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a constant current mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, meanwhile, the electric automobile controller continuously requests 6A input current for the charging pile until the minimum temperature of each group of power batteries is all more than 0 ℃, and the electric automobile enters a charging and heating stage in the fifth step,
if the minimum output current of the charging pile is larger than the rated heating current value of the power battery by 6A, or the electric automobile controller cannot acquire the minimum output current value of the charging pile, the electric automobile controller sends a signal to drive the charging pile to output electric energy in a reciprocating and circulating mode in a constant-voltage-constant-current alternating mode, the electric energy output by the charging pile is used for heating the power battery through a power battery heating circuit, and after the minimum temperature of all groups of power batteries is larger than 0 ℃, the electric automobile enters a fifth charging and heating stage;
the fifth step: the charging and heating stage is carried out, after the electric automobile enters the charging and heating stage, the electric automobile obtains small current from the charging pile and simultaneously charges and heats the power batteries, the electric automobile controller detects the temperature of each group of power batteries in real time, and when the lowest temperature of each group of power batteries is all higher than 15 ℃, the electric automobile enters the pure charging stage of the sixth step;
and a sixth step: and in the pure charging stage, after the electric automobile enters the pure charging stage, the electric automobile controller sends a signal to drive the charging pile to output constant current to the electric automobile until the power battery of the electric automobile is fully charged, and at the moment, the charging process of the electric automobile is completed.
2. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 1, characterized in that:
the working process of the constant voltage-constant current alternative mode in the charging pure heating stage in the fourth step is as follows: the electric automobile controller sends a signal to drive the power battery and the charging pile to provide electric energy for the power battery heating circuit, and the power battery heating circuit converts the electric energy into heat to continuously heat the power battery; the electric automobile controller controls the power battery heating circuit to be continuously and alternately switched between a constant voltage mode and a constant current mode until the condition of entering a heating stage while charging is met; the constant-voltage mode is that the power battery provides electric energy through self-discharge to heat the power battery, the constant-voltage mode lasts for 1.5 minutes, the constant-current mode is that the charging pile provides 6A input current for the electric automobile heating circuit to heat the power battery, and the constant-current mode lasts for 3 seconds.
3. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 2, characterized in that:
the information of the charging pile handshaking messages in the second charging handshaking stage comprises: the maximum allowable total charging voltage, the electric vehicle controller and vehicle identification information.
4. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 3, characterized in that:
and in the sixth step, the working process of the pure charging stage is in a constant-current charging mode, the electric automobile controller sends a charging demand to the charging pile, and the charging pile provides constant current which is the same as the charging demand after receiving the charging demand.
5. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 4, characterized in that:
the charging requirement includes: a demand voltage, a demand current, and a charging mode.
6. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 5, characterized in that:
the electric automobile controller is an electric automobile battery management system.
7. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 6, characterized in that:
the first step of charging wake-up direct current charging conditions comprise: the electric automobile detects that the charging wake-up signal, the CC2 charging connection signal and the electric automobile self-checking that fill electric pile output are trouble-free.
8. The heating control method for the electric vehicle during low-temperature direct-current charging according to claim 7, characterized in that:
if the charging handshake process fails in the second-step charging handshake, the charging pile stops outputting the charging wake-up signal, and meanwhile, the electric automobile sends out a charging failure alarm and goes down to sleep.
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