CN114633654B - Control method and device suitable for battery preheating of direct-current charging pile - Google Patents

Control method and device suitable for battery preheating of direct-current charging pile Download PDF

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Publication number
CN114633654B
CN114633654B CN202210474303.1A CN202210474303A CN114633654B CN 114633654 B CN114633654 B CN 114633654B CN 202210474303 A CN202210474303 A CN 202210474303A CN 114633654 B CN114633654 B CN 114633654B
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China
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battery
charged
charging
contactor
charging pile
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Chinese (zh)
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CN114633654A (en
Inventor
陈明亮
王晓玉
曹斌
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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Classifications

    • 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
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • 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
    • 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

Abstract

The invention provides a control method and a device for battery preheating of a direct current charging pile, comprising the following steps: if the battery to be charged needs to be preheated, after the charging handshake identification work is completed, controlling a contactor in the high-voltage loop to execute a switching action so that the battery to be charged is positioned in the high-voltage loop; acquiring a charging pile output ready message sent by a direct current charging pile, and sending a first battery charging requirement to the direct current charging pile so that the direct current charging pile outputs charging current; and under the condition that the charging current output by the direct-current charging pile meets the preset condition, a target contactor in the contactor is disconnected, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct-current charging pile is used for supplying power to the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged. The control method can realize the preheating of the battery to be charged by using the direct current charging pile, thereby ensuring the charging safety of the battery and reducing the service life attenuation of the battery.

Description

Control method and device suitable for battery preheating of direct-current charging pile
Technical Field
The invention relates to the technical field of battery preheating, in particular to a control method and a device for battery preheating suitable for a direct current charging pile.
Background
With the world resource shortage and the increasing environmental pollution, new energy automobiles represented by electric vehicles are greatly developed in China. As is well known, the battery configured on the existing electric vehicle is greatly affected by the ambient temperature, and when the temperature is very low (for example, -10 ℃ to-20 ℃), the charging pile cannot directly charge the battery. Because the chargeable current of the battery is very small when the battery is charged at low temperature (at lower temperature, the battery is forbidden to be charged, namely the chargeable current is 0), if the actual chargeable current output by the direct-current charging pile is larger (namely the chargeable current larger than the battery), the charging overcurrent is caused, the lithium is separated from the negative electrode of the battery, the service life of the battery is reduced, and when the lithium separation is serious, the lithium dendrite can puncture the diaphragm to cause thermal runaway, so that the safety risk is brought. Therefore, it is expected that the process of purely heating the battery at low temperature (i.e., preheating the battery) by the direct-current charging pile can be realized, the chargeable current of the battery is increased after the temperature of the battery is raised to a preset temperature threshold, the process of charging and heating is performed, and the process of charging only is performed finally after the heating is completed.
However, the direct-current charging pile complies with the direct-current charging national standard GB/T27930-2015 protocol, the working condition of the battery during pure heating is not considered in the process of the protocol specification, and the monitoring mechanism in the protocol specification causes that the direct-current charging pile cannot realize the working mode of pure heating. In the process of battery power-up, the direct current charging pile needs to detect that high voltage exists between the quick charging contactors, namely in the process of power-up, the battery needs to be in a high-voltage loop, the charging pile only outputs charging current required by a new energy automobile to carry out charging time sequence when the battery is in the high-voltage loop, and the battery cannot carry out pure heating on the battery always in the high-voltage loop.
In summary, how to use the dc charging pile to preheat the battery is a technical problem that needs to be solved at present.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a device for controlling battery preheating suitable for a dc charging pile, so as to solve the technical problem that the prior art cannot use the dc charging pile to preheat the battery.
In a first aspect, an embodiment of the present invention provides a method for controlling battery preheating of a dc charging pile, including:
when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work, judging whether the battery to be charged needs to be preheated or not;
if preheating is needed, after the charging handshake identification work is completed, controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action, enabling the battery to be charged to be in the high-voltage loop, and sending a battery charging readiness message to the direct-current charging pile;
acquiring a charging pile output ready message sent by the direct current charging pile, and sending a first battery charging demand to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging demand;
and under the condition that the charging current output by the direct current charging pile meets the preset condition, disconnecting a target contactor in the contactor, disconnecting the high-voltage loop of the battery to be charged, and enabling the charging current output by the direct current charging pile to supply power for the heater of the new energy automobile to be charged so as to heat the battery to be charged by the heater.
Further, the method further comprises:
judging whether the battery to be charged is heated;
if the heating is completed, closing the target contactor, enabling the battery to be charged to be in a high-voltage loop again, and executing a subsequent charging process.
Further, judging whether the battery to be charged needs to be preheated or not includes:
if the temperature of the battery to be charged is not greater than a first preset temperature, determining that the battery to be charged needs to be preheated;
if the temperature of the battery to be charged is greater than the first preset temperature, determining that the battery to be charged does not need to be preheated, and further executing a direct current charging process.
Further, determining whether the battery to be charged is heated, includes:
if the temperature of the battery to be charged is not less than a second preset temperature, determining that the battery to be charged is heated, wherein the second preset temperature is greater than the first preset temperature;
if the temperature of the battery to be charged is smaller than the second preset temperature, determining that the battery to be charged is not heated, and continuously enabling the direct-current charging pile to output charging current to supply power for the heater so as to heat the battery to be charged by the heater.
Further, after heating is completed, before closing the target contactor, the method further comprises:
and sending a second battery charging requirement to the direct current charging pile so that the direct current charging pile does not output charging current according to the second battery charging requirement.
Further, the charging current output by the direct current charging pile meets a preset condition, which includes: the charging current is greater than a preset current threshold.
Further, the heater includes any one of the following: PTC, heating film;
the target contactor includes any one of the following: a main positive contactor and a main negative contactor.
In a second aspect, an embodiment of the present invention further provides a control device for battery preheating applicable to a dc charging pile, including:
the judging unit is used for judging whether the battery to be charged needs to be preheated or not when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work;
the control unit is used for controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action after the charging handshake identification work is completed if preheating is needed, so that the battery to be charged is in the high-voltage loop, and sending a battery charging readiness message to the direct-current charging pile;
the acquisition and transmission unit is used for acquiring a charging pile output ready message transmitted by the direct current charging pile, and transmitting a first battery charging requirement to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging requirement;
and the contactor disconnection unit is used for disconnecting a target contactor in the contactor under the condition that the charging current output by the direct-current charging pile meets the preset condition, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct-current charging pile is used for supplying power for the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the method according to any one of the first aspects when the processor executes the computer program.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing machine-executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any one of the first aspects.
In an embodiment of the present invention, a control method for battery preheating applicable to a dc charging pile is provided, where the method includes: when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work, judging whether the battery to be charged needs to be preheated or not; if preheating is needed, after the charging handshake identification work is completed, controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action, enabling a battery to be charged to be in the high-voltage loop, and sending a battery charging readiness message to a direct-current charging pile; acquiring a charging pile output ready message sent by a direct current charging pile, and sending a first battery charging demand to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging demand; and under the condition that the charging current output by the direct-current charging pile meets the preset condition, a target contactor in the contactor is disconnected, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct-current charging pile is used for supplying power to the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged. As can be seen from the above description, in the control method for preheating a battery suitable for a dc charging pile, the dc charging pile can be used to preheat the battery to be charged, so as to ensure charging safety of the battery, reduce service life attenuation of the battery, and alleviate the technical problem that the battery cannot be preheated by using the dc charging pile in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a control method for battery preheating suitable for a dc charging pile according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a high-voltage loop of a new energy automobile according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control device for battery preheating suitable for a dc charging pile according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The battery that disposes on the electric motor car at present receives ambient temperature to influence very much, when the battery temperature is very low, its chargeable current is 0 when the temperature is low to a certain extent, if connect the battery that chargeable current is 0 into the direct current fills electric pile, make direct current fill electric pile heat for it earlier, heat to certain temperature after, it is unable to realize to recharge, because only after the battery is in the high-pressure circuit (namely after detecting to fill soon and exist high-pressure between the contactor), it can begin the output current to fill electric pile, and can't guarantee that this electric current of output is all used for the heater on the new energy automobile to use for the heater heats for the battery, must have some electric current still to charge for the battery (because the battery is in the high-pressure circuit, be difficult to avoid totally unacceptable current), but the chargeable current of battery is 0, obviously, charge like this can bring irreversible harm to the battery, influence battery life, therefore how to use direct current fills electric pile to preheat the battery and becomes the technical problem that needs to solve at present.
Based on the method, in the control method for preheating the battery suitable for the direct-current charging pile, the direct-current charging pile can be used for preheating the battery to be charged, so that the charging safety of the battery is ensured, and the service life attenuation of the battery is reduced.
For the sake of understanding the present embodiment, first, a method for controlling battery preheating suitable for dc charging piles disclosed in the present embodiment will be described in detail.
Embodiment one:
according to an embodiment of the present invention, there is provided an embodiment of a control method for battery pre-heating for a direct current charging stake, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and although a logical sequence is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than here.
Fig. 1 is a flowchart of a control method for battery preheating suitable for a dc charging pile according to an embodiment of the present invention, as shown in fig. 1, the method includes the steps of:
step S102, judging whether the battery to be charged needs to be preheated or not when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work;
the control method suitable for the battery preheating of the direct current charging pile in the embodiment of the invention can be applied to a BMS (battery management system) and a whole vehicle controller, and the execution main body of the control method is not particularly limited.
Before charging the battery to be charged, the direct-current charging pile initiates a wake-up signal to a new energy automobile to be charged (or BMS, or a whole vehicle controller), after the new energy automobile to be charged wakes up, the direct-current charging pile sends a charging pile identification message (CRM) to the new energy automobile to be charged, after the new energy automobile to be charged receives the charging pile identification message, the new energy automobile to be charged performs power-on self-test, after the new energy automobile to be charged is completed, the new energy automobile to be charged judges whether the battery to be charged needs preheating, and if the battery to be charged does not need preheating, a normal common direct-current charging flow is executed; if preheating is needed, the new energy automobile to be charged can send BMS and a new energy automobile to be charged identification message (BRM) to the direct current charging pile, so that the charging handshake identification work of the direct current charging pile and the new energy automobile to be charged is completed.
Step S104, if preheating is needed, after the charging handshake identification work is completed, controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action, enabling a battery to be charged to be in the high-voltage loop, and sending a battery charging readiness message to the direct-current charging pile;
fig. 2 shows a schematic diagram of a high-voltage circuit of a new energy vehicle, in which the contactors contained in the high-voltage circuit of the new energy vehicle to be charged are: a main positive contactor, a main negative contactor, a pre-charge contactor, a fast-charge positive contactor and a fast-charge negative contactor.
The above-mentioned control waits to charge the contactor in the high-voltage circuit of new energy automobile and carries out the switching action, specifically can be: and firstly closing the pre-charging contactor, then closing the main negative contactor, further judging whether the pre-charging capacity voltage is greater than 95% of the total voltage of the battery to be charged, if so, closing the main positive contactor, opening the pre-charging contactor, and then closing the quick-charging negative contactor and the quick-charging positive contactor, so that the battery to be charged is in a high-voltage loop, then sending a battery charging readiness message (BRO) to a direct-current charging pile, waiting for the direct-current charging pile to detect the high-voltage loop of the battery to be charged, and sending a charging pile output readiness message (CRO) to the new energy automobile to be charged by the direct-current charging pile after the direct-current charging pile detects that the battery to be charged is in the high-voltage loop.
Step S106, a charging pile output ready message sent by the direct current charging pile is obtained, and a first battery charging demand is sent to the direct current charging pile, so that the direct current charging pile outputs charging current according to the first battery charging demand;
specifically, after the new energy automobile to be charged acquires the message of readiness for outputting the charging pile, a first battery charging demand (first BCL) is sent to the direct current charging pile, and the first battery charging demand includes: voltage parameters, current parameters, and mode parameters, such as voltage: the voltage of the battery to be charged is +2V (the voltage of the direct current charging pile is larger than the voltage of the battery to be charged, so that the direct current charging pile can only output charging current, and when the voltage of the battery to be charged is equal to the voltage of the battery to be charged, the direct current charging pile cannot output current); current flow: 10A; mode: the embodiment of the invention does not limit the specific value of the parameters.
After receiving a first battery charging demand sent by a new energy automobile to be charged, the direct current charging pile outputs charging current according to the first battery charging demand.
And S108, disconnecting a target contactor in the contactor under the condition that the charging current output by the direct-current charging pile meets the preset condition, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct-current charging pile is used for supplying power to the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged.
Specifically, after the dc charging pile starts to output the charging current, the target contactor in the contactor is opened, so that the battery to be charged is disconnected from the high-voltage loop, even if the battery to be charged is separated from the high-voltage loop, the charging current output by the dc charging pile is not affected by the battery to be charged, but is used for supplying power to other high-voltage devices of the new energy automobile to be charged, at this time, the heater in other high-voltage devices is turned on, and thus, the charging current output by the dc charging pile is used for supplying power to the heater, thereby realizing the effect of heating the battery to be charged by the heater (the thermal loop is different from the electrical loop in fig. 2, and therefore, the thermal management calculation is not shown in fig. 2, the thermal management calculation is the same as that in the prior art, and is not repeated here), namely, the preheating of the battery to be charged by the dc charging pile is realized.
In an embodiment of the present invention, a control method for battery preheating applicable to a dc charging pile is provided, where the method includes: when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work, judging whether the battery to be charged needs to be preheated or not; if preheating is needed, after the charging handshake identification work is completed, controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action, enabling a battery to be charged to be in the high-voltage loop, and sending a battery charging readiness message to a direct-current charging pile; acquiring a charging pile output ready message sent by a direct current charging pile, and sending a first battery charging demand to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging demand; and under the condition that the charging current output by the direct-current charging pile meets the preset condition, a target contactor in the contactor is disconnected, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct-current charging pile is used for supplying power to the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged. As can be seen from the above description, in the control method for preheating a battery suitable for a dc charging pile, the dc charging pile can be used to preheat the battery to be charged, so as to ensure charging safety of the battery, reduce service life attenuation of the battery, and alleviate the technical problem that the battery cannot be preheated by using the dc charging pile in the prior art.
The foregoing briefly describes the control method of battery preheating suitable for a dc charging stake of the present invention, and the specific details relating thereto are described in detail below.
In an alternative embodiment of the invention, after the heater is implemented to heat the battery to be charged, the method further comprises:
(1) Judging whether the battery to be charged is heated;
specifically, if the temperature of the battery to be charged is not less than the second preset temperature, the battery to be charged is determined to be heated; if the temperature of the battery to be charged is smaller than the second preset temperature, the battery to be charged is determined to be unheated, and the direct-current charging pile is continuously enabled to output charging current to supply power for the heater, so that the heater is enabled to heat the battery to be charged until the temperature of the battery to be charged is not smaller than the second preset temperature.
The second preset temperature may be-10 ℃, which is not specifically limited in the embodiment of the present invention, and the second preset temperature is different for different batteries to be charged.
(2) If the heating is completed, the target contactor is closed, so that the battery to be charged is in a high-voltage loop again, and a subsequent charging process is executed.
Specifically, the subsequent charging process is a charging process in the conventional scheme, and includes: a charging-while-heating process and a charging-only process.
In an alternative embodiment of the present invention, determining whether the battery to be charged needs preheating specifically includes:
1) If the temperature of the battery to be charged is not greater than the first preset temperature, determining that the battery to be charged needs to be preheated;
the first preset temperature may be-20 ℃, which is not particularly limited in the embodiment of the present invention, and the first preset temperature is different for different batteries to be charged.
That is, it is initially determined whether the temperature of the battery to be charged is not more than-20 ℃, if not more than-20 ℃, preheating is required, the above-mentioned steps S104 to S108 are performed to heat the battery to be charged, after the heating is performed, it is further determined whether the temperature of the heated battery to be charged is not less than-10 ℃ (thermal management has a rebound margin, for example, the battery can be normally charged when the temperature is more than-20 ℃, but the battery cannot be just heated to-20 ℃ to be heated to-10 ℃, 15 ℃), if the temperature is not less than-10 ℃, the heating is completed, and the subsequent charging process (the process of charging while heating and charging only) is performed; if the temperature is less than minus 10 ℃, continuing heating until the temperature is not less than minus 10 ℃, and then carrying out the subsequent charging process;
when the temperature of the battery to be charged is judged to be higher than-20 ℃ at first, preheating is not performed, that is, the temperature of the battery to be charged is not particularly low, and the process of charging while heating and charging only can be performed directly.
2) If the temperature of the battery to be charged is higher than the first preset temperature, determining that the battery to be charged does not need to be preheated, and further executing a direct current charging process.
In an alternative embodiment of the invention, the method further comprises, prior to closing the target contactor:
and sending a second battery charging requirement to the direct current charging pile so that the direct current charging pile does not output charging current according to the second battery charging requirement.
Specifically, after the heating of the battery to be charged is completed, the battery to be charged needs to be charged, that is, the target contactor needs to be opened before being closed, and before the target contactor is closed, considering that the direct current charging pile outputs the charging current corresponding to the charging requirement of the first battery, the direct closing target contactor is easy to generate arc discharge due to the existence of the charging current, so before the target contactor is closed, the new energy automobile to be charged sends a second battery charging requirement (second BCL) to the direct current charging pile, and the second battery charging requirement also comprises: voltage parameters, current parameters, and mode parameters, such as voltage: the voltage of the battery to be charged (the voltage of the direct current charging pile is equal to the voltage of the battery to be charged, so that the direct current charging pile cannot output current); current flow: 0A; mode: after receiving the second battery charging requirement, the constant voltage direct current charging pile does not output charging current according to the second battery charging requirement, and then the target contactor is closed.
In an alternative embodiment of the present invention, the charging current output by the dc charging pile satisfying the preset condition includes: the charging current is greater than a preset current threshold.
The preset current threshold may be 2A (the value is not limited in the embodiment of the present invention), and the above process illustrates that only after it is actually determined that the dc charging pile starts to output the charging current, the target contactor in the contactor is disconnected, so that the subsequent dc charging pile always outputs the current. If the direct current charging pile does not output charging current yet, the target contactor is disconnected, the direct current charging pile can detect that the battery to be charged is not in the high-voltage loop, and the current is not output all the time later, so that the preheating and charging processes cannot be realized.
In an alternative embodiment of the invention, the heater comprises any one of the following: PTC, heating film;
the target contactor includes any one of the following: a main positive contactor and a main negative contactor.
The control method for battery preheating suitable for the direct current charging pile is simple to operate, and can be used for preheating the battery (only heating is not carried out, the battery is not in a high-voltage loop and has no low-temperature charging risk) on the direct current charging pile on the current market, so that real-vehicle batch verification is completed, the safety of the battery is ensured, and the service life attenuation of the battery is reduced.
Embodiment two:
the embodiment of the invention also provides a control device suitable for the battery preheating of the direct current charging pile, which is mainly used for executing the control method suitable for the battery preheating of the direct current charging pile provided in the first embodiment of the invention.
Fig. 3 is a schematic diagram of a control device for battery preheating of a dc charging pile according to an embodiment of the present invention, and as shown in fig. 3, the device mainly includes: a judging unit 10, a control unit 20, an acquiring and transmitting unit 30, and a contactor opening unit 40, wherein:
the judging unit is used for judging whether the battery to be charged needs to be preheated or not when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work;
the control unit is used for controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action after the charging handshake identification work is completed if the preheating is needed, so that the battery to be charged is in the high-voltage loop, and sending a battery charging readiness message to the direct-current charging pile;
the acquisition and transmission unit is used for acquiring a charging pile output ready message transmitted by the direct current charging pile, and transmitting a first battery charging requirement to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging requirement;
and the contactor disconnection unit is used for disconnecting a target contactor in the contactor under the condition that the charging current output by the direct current charging pile meets the preset condition, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct current charging pile is used for supplying power for the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged.
In an embodiment of the present invention, there is provided a control device for battery preheating suitable for a dc charging pile, the device including: when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work, judging whether the battery to be charged needs to be preheated or not; if preheating is needed, after the charging handshake identification work is completed, controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action, enabling a battery to be charged to be in the high-voltage loop, and sending a battery charging readiness message to a direct-current charging pile; acquiring a charging pile output ready message sent by a direct current charging pile, and sending a first battery charging demand to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging demand; and under the condition that the charging current output by the direct-current charging pile meets the preset condition, a target contactor in the contactor is disconnected, so that the battery to be charged is disconnected from the high-voltage loop, and the charging current output by the direct-current charging pile is used for supplying power to the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged. As can be seen from the above description, in the control device for preheating a battery suitable for a dc charging pile, the dc charging pile can be used to preheat the battery to be charged, so as to ensure charging safety of the battery, reduce service life attenuation of the battery, and alleviate the technical problem that the battery cannot be preheated by using the dc charging pile in the prior art.
Optionally, the device is further configured to: judging whether the battery to be charged is heated; if the heating is completed, the target contactor is closed, so that the battery to be charged is in a high-voltage loop again, and a subsequent charging process is executed.
Optionally, the judging unit is further configured to: if the temperature of the battery to be charged is not greater than the first preset temperature, determining that the battery to be charged needs to be preheated; if the temperature of the battery to be charged is higher than the first preset temperature, determining that the battery to be charged does not need to be preheated, and further executing a direct current charging process.
Optionally, the device is further configured to: if the temperature of the battery to be charged is not less than the second preset temperature, determining that the battery to be charged is heated, wherein the second preset temperature is greater than the first preset temperature; if the temperature of the battery to be charged is smaller than the second preset temperature, the battery to be charged is determined to be unheated, and the direct-current charging pile is continuously enabled to output charging current to supply power for the heater, so that the heater can heat the battery to be charged.
Optionally, the device is further configured to: and sending a second battery charging requirement to the direct current charging pile so that the direct current charging pile does not output charging current according to the second battery charging requirement.
Optionally, the charging current output by the direct current charging pile meets a preset condition includes: the charging current is greater than a preset current threshold.
Optionally, the heater comprises any one of: PTC, heating film; the target contactor includes any one of the following: a main positive contactor and a main negative contactor.
The device provided by the embodiment of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiment, and for the sake of brevity, reference may be made to the corresponding content in the foregoing method embodiment where the device embodiment is not mentioned.
As shown in fig. 4, an electronic device 600 provided in an embodiment of the present application includes: the battery pre-heating control method comprises the steps of a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601, when the electronic device is running, the processor 601 and the memory 602 are communicated through the bus, and the processor 601 executes the machine-readable instructions to execute the steps of the battery pre-heating control determining method suitable for the direct-current charging pile.
Specifically, the above-mentioned memory 602 and the processor 601 can be general-purpose memories and processors, and are not particularly limited herein, and the above-mentioned control determination method applicable to the battery preheating of the dc charging stake can be executed when the processor 601 runs the computer program stored in the memory 602.
The processor 601 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 601 or instructions in the form of software. The processor 601 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but may also be a digital signal processor (Digital Signal Processing, DSP for short), application specific integrated circuit (Application Specific Integrated Circuit, ASIC for short), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA for short), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory 602, and the processor 601 reads information in the memory 602 and performs the steps of the above method in combination with its hardware.
Corresponding to the above control determining method for battery preheating of the direct current charging pile, the embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores machine executable instructions, and the computer executable instructions, when being called and operated by a processor, cause the processor to operate the steps of the above control determining method for battery preheating of the direct current charging pile.
The control determining device suitable for battery preheating of the direct current charging pile provided by the embodiment of the application can be specific hardware on equipment or software or firmware installed on the equipment. The device provided in the embodiments of the present application has the same implementation principle and technical effects as those of the foregoing method embodiments, and for a brief description, reference may be made to corresponding matters in the foregoing method embodiments where the device embodiment section is not mentioned. It will be clear to those skilled in the art that, for convenience and brevity, the specific operation of the system, apparatus and unit described above may refer to the corresponding process in the above method embodiment, which is not described in detail herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
As another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments provided in the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing an electronic device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the vehicle marking method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
It should be noted that: like reference numerals and letters in the following figures denote like items, and thus once an item is defined in one figure, no further definition or explanation of it is required in the following figures, and furthermore, the terms "first," "second," "third," etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. Are intended to be encompassed within the scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (9)

1. The control method for preheating the battery suitable for the direct-current charging pile is characterized by comprising the following steps of:
when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work, judging whether the battery to be charged needs to be preheated or not;
if preheating is needed, after the charging handshake identification work is completed, controlling a contactor in a high-voltage loop of the new energy automobile to be charged to execute a switching action, so that the battery to be charged is in the high-voltage loop, and sending a battery charging readiness message to the direct-current charging pile, wherein the high-voltage loop of the new energy automobile to be charged comprises: the positive pole of waiting to charge battery is connected with the one end of main positive contactor, pre-charge contactor respectively, main positive contactor the other end of pre-charge contactor is connected with the one end of heater, quick positive contactor respectively, the other end of quick positive contactor with the one end of direct current fills electric pile and is connected, the other end of direct current fills electric pile is connected with the one end of quick negative contactor, the other end of quick negative contactor is connected with the one end of main negative contactor, the other end of main negative contactor with wait to charge battery's negative pole to be connected, control wait to charge the contactor in the high-pressure circuit of new energy automobile and carry out the switching action and include: firstly closing a pre-charging contactor, then closing a main negative contactor, further judging whether the pre-charging capacity voltage is greater than 95% of the total voltage of the battery to be charged, if so, closing the main positive contactor, opening the pre-charging contactor, and then closing a fast charging negative contactor and a fast charging positive contactor, so that the battery to be charged is in a high-voltage loop;
acquiring a charging pile output ready message sent by the direct current charging pile, and sending a first battery charging demand to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging demand;
and under the condition that the charging current output by the direct current charging pile meets the preset condition, disconnecting a main positive contactor or a main negative contactor in the contactor, so that the to-be-charged battery disconnects a high-voltage loop, and the charging current output by the direct current charging pile supplies power for a heater of the to-be-charged new energy automobile so as to heat the to-be-charged battery by the heater, wherein the condition that the charging current output by the direct current charging pile meets the preset condition comprises the following steps: the charging current is greater than a preset current threshold.
2. The method according to claim 1, wherein the method further comprises:
judging whether the battery to be charged is heated;
if the heating is completed, closing the target contactor, enabling the battery to be charged to be in a high-voltage loop again, and executing a subsequent charging process.
3. The method of claim 2, wherein determining whether the battery to be charged requires preheating comprises:
if the temperature of the battery to be charged is not greater than a first preset temperature, determining that the battery to be charged needs to be preheated;
if the temperature of the battery to be charged is greater than the first preset temperature, determining that the battery to be charged does not need to be preheated, and further executing a direct current charging process.
4. A method according to claim 3, wherein determining whether the battery to be charged is heated up, comprises:
if the temperature of the battery to be charged is not less than a second preset temperature, determining that the battery to be charged is heated, wherein the second preset temperature is greater than the first preset temperature;
if the temperature of the battery to be charged is smaller than the second preset temperature, determining that the battery to be charged is not heated, and continuously enabling the direct-current charging pile to output charging current to supply power for the heater so as to heat the battery to be charged by the heater.
5. The method of claim 2, wherein after heating is complete, before closing the target contactor, the method further comprises:
and sending a second battery charging requirement to the direct current charging pile so that the direct current charging pile does not output charging current according to the second battery charging requirement.
6. The method of claim 1, wherein the heater comprises any one of: PTC, heating film.
7. A control device for battery preheating suitable for a direct current charging pile, comprising:
the judging unit is used for judging whether the battery to be charged needs to be preheated or not when the direct-current charging pile and the new energy automobile to be charged carry out charging handshake identification work;
the control unit is used for controlling the contactor in the high-voltage loop of the new energy automobile to be charged to execute a switching action after the charging handshake identification work is completed if the preheating is needed, so that the battery to be charged is in the high-voltage loop, and sending a battery charging readiness message to the direct-current charging pile, wherein the high-voltage loop of the new energy automobile to be charged comprises: the positive pole of waiting to charge battery is connected with the one end of main positive contactor, pre-charge contactor respectively, main positive contactor the other end of pre-charge contactor is connected with the one end of heater, quick positive contactor respectively, the other end of quick positive contactor with the one end of direct current fills electric pile and is connected, the other end of direct current fills electric pile is connected with the one end of quick negative contactor, the other end of quick negative contactor is connected with the one end of main negative contactor, the other end of main negative contactor with wait to charge battery's negative pole to be connected, control wait to charge the contactor in the high-pressure circuit of new energy automobile and carry out the switching action and include: firstly closing a pre-charging contactor, then closing a main negative contactor, further judging whether the pre-charging capacity voltage is greater than 95% of the total voltage of the battery to be charged, if so, closing the main positive contactor, opening the pre-charging contactor, and then closing a fast charging negative contactor and a fast charging positive contactor, so that the battery to be charged is in a high-voltage loop;
the acquisition and transmission unit is used for acquiring a charging pile output ready message transmitted by the direct current charging pile, and transmitting a first battery charging requirement to the direct current charging pile so that the direct current charging pile outputs charging current according to the first battery charging requirement;
the contactor disconnection unit is used for disconnecting a main positive contactor or a main negative contactor in the contactor under the condition that the charging current output by the direct current charging pile meets the preset condition, so that the battery to be charged disconnects a high-voltage loop, and the charging current output by the direct current charging pile is used for supplying power to the heater of the new energy automobile to be charged, so that the heater is used for heating the battery to be charged, wherein the charging current output by the direct current charging pile meets the preset condition and comprises the following steps: the charging current is greater than a preset current threshold.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of the preceding claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium storing machine executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any one of the preceding claims 1 to 6.
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