CN113752888A - Battery energy processing method and device and vehicle - Google Patents

Battery energy processing method and device and vehicle Download PDF

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Publication number
CN113752888A
CN113752888A CN202010501647.8A CN202010501647A CN113752888A CN 113752888 A CN113752888 A CN 113752888A CN 202010501647 A CN202010501647 A CN 202010501647A CN 113752888 A CN113752888 A CN 113752888A
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China
Prior art keywords
charging
battery
vehicle
voltage
module
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CN202010501647.8A
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CN113752888B (en
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凌和平
闫磊
彭星星
宋金梦
袁帅
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/66—Data transfer between charging stations and vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using 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
    • Y02T10/70—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Abstract

The disclosure relates to a battery energy processing method and device and a vehicle. The method comprises the following steps: determining a battery heating state of the vehicle when the charging instruction is received; selecting a target charging mode from a plurality of preset charging modes according to the battery heating state of the vehicle, wherein the plurality of preset charging modes comprise a normal flow charging mode and a low current voltage stabilization charging mode; and if the selected target charging mode is the low-current voltage-stabilizing charging mode, sending a first charging requirement to a charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement. Like this, when need go on simultaneously with battery charging and heating, send corresponding demand of charging to filling electric pile to make and fill electric pile with corresponding mode output electric energy, guarantee when battery charging, can heat the battery safely, effectively, thereby improved and used car efficiency.

Description

Battery energy processing method and device and vehicle
Technical Field
The disclosure relates to the field of vehicle charging control, in particular to a battery energy processing method and device and a vehicle.
Background
With the wide use of new energy, batteries can be used as a power source in the field of vehicles. The battery may be used as a power source in different environments, and the performance of the battery may be affected. In a low-temperature environment, the performance of the battery is greatly reduced compared with the normal temperature. For example, the discharge capacity of a battery at sub-zero degrees decreases with decreasing temperature. At-30 ℃, the discharge capacity of the battery is basically zero, so that the battery cannot be used. In order to use a battery in a low-temperature environment, the battery needs to be heated before being used, but when the battery is heated by oscillation, a part of the electric quantity of the battery is consumed, so that the electric quantity of the battery is reduced, and the endurance of the battery is influenced.
Disclosure of Invention
The purpose of the present disclosure is to provide a battery energy processing method and apparatus, and a vehicle, which can realize charging of a battery simultaneously while the battery is heated by oscillation, and which has good practicability.
In order to achieve the above object, the present disclosure provides a battery energy processing method, the method including:
determining a battery heating state of the vehicle when the charging instruction is received;
selecting a target charging mode from a plurality of preset charging modes according to the battery heating state of the vehicle, wherein the plurality of preset charging modes comprise a normal flow charging mode and a low current voltage stabilization charging mode;
and if the selected target charging mode is the low-current voltage-stabilizing charging mode, sending a first charging requirement to a charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement.
Optionally, determining a battery heating status of the vehicle comprises:
if the battery is detected to be in oscillation heating, determining that the battery heating state of the vehicle is a heating state;
if the battery is detected not to be in the process of oscillating heating and the vehicle meets the condition of starting oscillating heating, determining that the battery heating state of the vehicle is a heating demand state;
and if the condition that the battery is not in the process of oscillating heating and the vehicle does not meet the condition of starting oscillating heating is detected, determining that the battery heating state of the vehicle is a heating-free state.
Optionally, selecting a target charging mode from a plurality of preset charging modes according to the battery heating state of the vehicle includes:
if the battery heating state of the vehicle is a heating state or a heating demand state, selecting a target charging mode as a low-current voltage-stabilizing charging mode;
and if the battery heating state of the vehicle is a heating-demand-free state, selecting the target charging mode as a normal-process charging mode.
Optionally, if the selected target charging mode is the low-current voltage-stabilizing charging mode, sending a first charging requirement to a charging pile so that the charging pile outputs a current to charge the battery according to the first charging requirement, including:
if the selected target charging mode is the low-current voltage-stabilizing charging mode, adjusting the voltage of the charging port side of a vehicle-mounted charging module according to the voltage of the battery and the maximum output voltage of the charging pile so as to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the battery and the maximum output voltage of the charging pile;
sending a charging parameter message to the charging pile, wherein the vehicle voltage in the charging parameter message is the voltage at the charging port side of the vehicle-mounted charging module;
and if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be completed, sending a vehicle charging preparation message and the first charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement.
Optionally, adjusting the voltage of the charging port side of the vehicle-mounted charging module according to the voltage of the battery and the maximum output voltage of the charging pile includes:
if the vehicle-mounted charging module is a vehicle-mounted charger, adjusting the voltage of the charging port side of the vehicle-mounted charging module to be equal to the voltage of the battery;
and if the vehicle-mounted charging module is a compressor or a boosting DC module, controlling to regulate the voltage of the charging port side of the vehicle-mounted charging module to a first target voltage, wherein the first target voltage is smaller than the maximum output voltage of the charging pile and smaller than the voltage of the battery.
Optionally, after the step of sending a vehicle charging preparation message and the first charging demand to the charging pile if it is determined that the voltage regulation on the charging port side of the vehicle-mounted charging module is completed, so that the charging pile outputs a current to charge the battery according to the first charging demand, and controlling to start the battery heating circuit, the method further includes:
if the battery is determined to reach the condition of quitting the heating, controlling to close the battery heating circuit, quitting the low-current voltage-stabilizing charging mode, and reselecting the target charging mode as the normal-process charging mode;
and sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
Optionally, the vehicle-mounted charging module is a vehicle-mounted charger, and after the step of reselecting the target charging mode as the normal flow charging mode, the method further includes:
judging whether the difference value between the voltage of the charging port side of the vehicle-mounted charging module and the voltage of the battery is smaller than a preset difference value threshold value or not;
if the difference value is smaller than the preset difference value threshold value, controlling to switch on a direct charging circuit and controlling to switch off a vehicle-mounted charging module circuit so as to charge the battery in a direct charging mode;
and if the difference is larger than the preset difference threshold value, controlling to turn off the charging loop to stop charging.
In this embodiment, sending a second charging requirement to the charging pile to enable the charging pile to output a current to charge the battery according to the second charging requirement includes: and if the difference value is smaller than the preset difference value threshold value, sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
Optionally, the on-board charging module is a compressor or a boost DC module, and after the step of reselecting the target charging mode to be the normal flow charging mode, the method further comprises:
controlling to regulate the voltage at the charging port side of the vehicle-mounted charging module to a second target voltage, switching on a direct charging circuit, and switching off the vehicle-mounted charging module circuit to charge the battery in a direct charging mode;
alternatively, the first and second electrodes may be,
and controlling to regulate the voltage at the charging port side of the motor boosting charging circuit to be equal to the voltage at the charging port side of the vehicle-mounted charging module, switching on the motor boosting charging circuit, switching off the circuit of the vehicle-mounted charging module, and switching on the motor boosting charging circuit so as to adopt the motor boosting circuit to boost and charge the battery.
Optionally, the method further comprises:
if the selected target charging mode is the normal process charging mode, detecting whether the vehicle meets the condition of starting oscillation heating or not in the process of controlling the battery to be charged;
and if the vehicle meets the condition of starting oscillation heating, reselecting the target charging mode as a low-current voltage-stabilizing charging mode.
Optionally, if the selected target charging mode is the low-current voltage-stabilizing charging mode, sending a first charging requirement to a charging pile so that the charging pile outputs a current to charge the battery according to the first charging requirement, including:
according to the voltage of the current charging port side of the vehicle, adjusting the voltage of the charging port side of the vehicle-mounted charging module to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the current charging port side of the vehicle;
if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be finished, the first charging requirement is sent to the charging pile, so that the charging pile outputs current to charge the battery according to the first charging requirement;
and controlling the vehicle-mounted charging module to charge the battery and starting the battery heating circuit.
The present disclosure also provides a battery energy processing apparatus, the apparatus comprising:
the determining module is used for determining the heating state of the battery of the vehicle when receiving the charging instruction;
the charging control device comprises a selection module, a charging control module and a charging control module, wherein the selection module is used for selecting a target charging mode from a plurality of preset charging modes according to the battery heating state of the vehicle, and the plurality of preset charging modes comprise a normal flow charging mode and a low-current voltage-stabilizing charging mode;
the first sending module is used for sending a first charging requirement to a charging pile if the selected target charging mode is the low-current voltage-stabilizing charging mode, so that the charging pile outputs current to charge the battery according to the first charging requirement.
The present disclosure also provides a vehicle including a battery and a processor for performing the above battery energy processing method provided by the present disclosure.
Through the technical scheme, when the charging instruction is received, if the selected target charging mode is the low-current voltage-stabilizing charging mode according to the battery heating state of the vehicle, the charging pile is controlled to output current to charge the battery according to the first charging requirement. Like this, when need go on simultaneously with battery charging and heating, send corresponding demand of charging to filling electric pile to make and fill electric pile with corresponding mode output electric energy, guarantee when battery charging, can heat the battery safely, effectively, thereby improved and used car efficiency.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow diagram of a battery energy handling method provided by an exemplary embodiment;
FIG. 2 is a schematic diagram of a circuit for battery energy processing provided by an exemplary embodiment;
FIG. 3 is a signaling interaction diagram for battery energy handling provided by an exemplary embodiment;
FIG. 4 is a schematic diagram of a circuit for battery energy processing provided by an exemplary embodiment;
FIG. 5 is a signaling interaction diagram for battery energy handling provided by another example embodiment;
FIG. 6 is a signaling interaction diagram for battery energy handling provided by yet another example embodiment;
FIG. 7 is a schematic diagram of a circuit for battery energy processing provided by another exemplary embodiment;
FIG. 8 is a signaling interaction diagram for battery energy handling provided by yet another example embodiment;
fig. 9 is a block diagram of a battery energy processing apparatus according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a battery energy processing method according to an exemplary embodiment. As shown in fig. 1, the method may include the steps of:
in step S11, upon receiving the charging instruction, the battery heating state of the vehicle is determined.
In step S12, a target charging mode is selected from a plurality of preset charging modes according to a battery heating state of the vehicle, wherein the plurality of preset charging modes include a normal flow charging mode and a low current regulated charging mode.
Step S13, if the selected target charging mode is the low-current voltage-stabilizing charging mode, sending a first charging requirement to the charging pile, so that the charging pile outputs a current to charge the battery according to the first charging requirement.
The method of the present disclosure is applied to a vehicle. For example, the vehicle receives the charging control instruction immediately after the charging gun is inserted into the charging port of the vehicle, or the vehicle receives the charging instruction transmitted by the user through the APP in the operation terminal in a state where the charging gun is inserted into the charging port of the vehicle. The specific form of receiving the charging command adopts the scheme in the related art, and the details are not described here.
In the related art, if a charging instruction is received, the vehicle starts charging the battery according to a predetermined flow control. However, if the battery is in a battery oscillation heating state at this time, the battery and the energy storage element perform cyclic charging and discharging in the battery oscillation heating process, so that the internal resistance of the battery generates heat, the battery is heated, the voltage of the battery fluctuates, the voltage fluctuation can be detected by the charging pile to cause the charging pile end to control disconnection for charging the vehicle, and the oscillation heating and charging processes of the battery cannot be performed simultaneously.
In the scheme of the disclosure, when a charging instruction is received, a battery heating state of a vehicle is determined. Each battery heating state may have a charging mode corresponding thereto. The selected target charging mode may be a charging mode corresponding to the determined battery heating state among a preset plurality of charging modes.
The normal-flow charging mode may be a mode in the related art in which the battery of the vehicle is charged in accordance with the normal charging flow. The charging mode with the small current and the voltage stabilization is added in the charging device, the voltage of a charging port at the vehicle end can be stabilized, the influence of voltage fluctuation at two ends of the battery on charging can be avoided, and then the charging of the battery can be realized during the execution of oscillation heating. In the low-current regulated charging mode, the vehicle can send a specific charging demand, i.e., a first charging demand, to the charging pile. The first charging requirement may include a first target charging current value, and the charging post may output the first target charging current value in response to the first charging requirement to charge the battery. The first target charging current value in the first charging demand may be smaller than the charging demand (hereinafter, second charging demand) that the vehicle sends to the charging post in the related art. In addition, the vehicle can also perform proper adjustment on a charging loop in the vehicle to reduce the fluctuation of the battery voltage caused by the oscillation heating of the battery. Therefore, the newly added charging mode is named as a low-current voltage-stabilizing charging mode in the scheme.
Through the technical scheme, when the charging instruction is received, if the selected target charging mode is the low-current voltage-stabilizing charging mode according to the battery heating state of the vehicle, the charging pile is controlled to output current to charge the battery according to the first charging requirement. Like this, when need go on simultaneously with battery charging and heating, send corresponding demand of charging to filling electric pile to make and fill electric pile with corresponding mode output electric energy, guarantee when battery charging, can heat the battery safely, effectively, thereby improved and used car efficiency.
In one embodiment, the above-mentioned determining the battery heating state of the vehicle may include the following various cases:
if the battery is detected to be in the oscillation heating state, determining that the battery heating state of the vehicle is in the heating state;
if the battery is detected not to be in the process of oscillating heating and the vehicle meets the condition of starting oscillating heating, determining that the battery heating state of the vehicle is a heating demand state;
and if the battery is detected not to be in the process of the oscillation heating and the vehicle does not meet the condition of starting the oscillation heating, determining that the battery heating state of the vehicle is a heating-demand-free state.
The condition for starting the oscillating heating may be that the temperature of the battery is less than a predetermined temperature threshold (e.g., -20 ℃), that is, the temperature of the battery is too low, that the SOC of the battery is greater than a predetermined charge threshold (e.g., 20%) while the temperature of the battery is less than the predetermined temperature threshold, or that the temperature of the battery is less than the predetermined temperature threshold, that the SOC of the battery is greater than the predetermined charge threshold, and that no failure of the battery is detected. If the vehicle satisfies the condition for starting the oscillation heating, it is considered that the battery should be heated at this time.
The scenario regarding each state may be, for example, the following:
in a heating state, namely the battery is heating, the charging gun is inserted into a vehicle charging port, or in a state that the charging gun is inserted into the vehicle charging port, the user sends a charging instruction through an APP in the terminal;
in a heating demand state, namely the battery is not heated, a charging gun is inserted into a vehicle charging port, namely whether the current vehicle meets the condition of starting oscillation heating or not is detected, and the detection result is that the condition of starting oscillation heating is met;
in the state without heating requirement, namely the battery is not heated, the charging gun is inserted into the charging port of the vehicle, whether the current vehicle meets the condition for starting the oscillation heating is detected, and the detection result is that the condition for starting the oscillation heating is not met.
In the scheme, the battery heating state of the vehicle is determined to be three states of heating, heating demand and no heating demand by judging whether the battery is currently in oscillation heating or not and whether the condition for starting oscillation heating is met or not when the battery is not in oscillation heating. This accurate classification of battery heating state can make the vehicle accurately to fill electric pile send with actual demand assorted demand that charges, can make finally to fill electric pile and charge according to actual demand.
In still another embodiment, the step of selecting a target charging mode from a preset plurality of charging modes according to the battery heating state of the vehicle (step S12) may include:
if the battery heating state of the vehicle is a heating state or a heating demand state, selecting a target charging mode as a low-current voltage-stabilizing charging mode; and if the battery heating state of the vehicle is a heating-demand-free state, selecting the target charging mode as a normal-process charging mode.
That is, in the case of the no heating demand state, the charging is performed according to the normal charging flow control in the related art based on the normal flow charging mode.
Under the condition of heating state or having the heating demand state, then need charge and the heating of vibration go on simultaneously, then charge according to the control of undercurrent steady voltage charging mode, in this undercurrent steady voltage charging mode, fill electric pile output less current, and carry out the steady voltage to the voltage of vehicle charging port side to guarantee that fill electric pile can not control because of detecting the fluctuation of battery voltage and stop charging.
In another embodiment, if the selected target charging mode is the low-current regulated charging mode, the step of sending the first charging requirement to the charging post so that the charging post outputs a current to charge the battery according to the first charging requirement (step S13) may include:
if the selected target charging mode is a low-current voltage-stabilizing charging mode, adjusting the voltage of the charging port side of the vehicle-mounted charging module according to the voltage of the battery and the maximum output voltage of the charging pile so as to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the battery and the maximum output voltage of the charging pile;
sending a charging parameter message to a charging pile, wherein the vehicle voltage in the charging parameter message is the voltage at the charging port side of the vehicle-mounted charging module;
and if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be completed, sending a vehicle charging preparation message and a first charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement.
Further, if the battery heating state of the vehicle is a heating demand state, the charging pile outputs current to charge the battery according to the first charging demand, and meanwhile the battery heating circuit is controlled to be started.
The vehicle-mounted charging module may be a module connected between a dc charging port of the vehicle and the battery. The vehicle-mounted charging module can avoid the situation that the charging pile is controlled to stop charging because the fluctuation of the voltage of the battery is detected. The on-board charging module may multiplex an on-board charger, a compressor, or a boost DC (DC) module in the vehicle.
According to the scheme, the voltage of the charging port side of the vehicle-mounted charging module is adjusted, so that the current of the charging pile can be output to the vehicle, and the situation that the vehicle cannot be charged by the charging pile due to the fact that the voltage of the charging port side of the vehicle-mounted charging module is not matched with the maximum output voltage of the charging pile (for example, the voltage of the charging port side of the vehicle-mounted charging module is larger than the maximum output voltage of the charging pile) is avoided.
Because the vehicle-mounted charging module is directly connected with the charging pile, the vehicle voltage in the charging parameter message sent by the vehicle to the charging pile is the voltage at the charging port side of the vehicle-mounted charging module. And the vehicle sends a vehicle charging preparation message to the charging pile after the voltage regulation on the charging port side of the vehicle-mounted charging module is completed. Since the vehicle is actually ready for charging when the adjustment is completed, this ensures that the charging of the battery is carried out smoothly.
The vehicle-mounted charger can multiplex circuits in various vehicle-mounted modules, so that the voltage at the charging port side of different specific circuit structures of different vehicle-mounted chargers can correspond to different voltage regulation strategies. In one embodiment, adjusting the voltage of the charging port side of the vehicle-mounted charging module according to the voltage of the battery and the maximum output voltage of the charging post comprises:
if the vehicle-mounted charging module is a vehicle-mounted charger, adjusting the voltage of the charging port side of the vehicle-mounted charging module to be equal to the voltage of the battery;
and if the vehicle-mounted charging module is a compressor or a boosting DC module, controlling to regulate the voltage of the charging port side of the vehicle-mounted charging module to be a first target voltage, wherein the first target voltage is smaller than the maximum output voltage of the charging pile and smaller than the voltage of the battery.
As described above, the in-vehicle charging module may be an in-vehicle charger, and in this case, the voltage on the charging port side of the in-vehicle charging module may be adjusted to be equal to the voltage of the battery, in consideration of the specific circuit configuration in the in-vehicle charger. Similarly, the voltage on the charging port side of the vehicle-mounted charging module may be adjusted to be less than the maximum output voltage of the charging post and less than the voltage of the battery, in consideration of the specific circuit structure of the compressor or the step-up DC module.
In the embodiment, according to the difference of the circuit structure in the vehicle-mounted charging module, the voltage at the charging port side is adjusted according to different adjustment strategies, so that the requirement of an actual circuit is met, and the smooth charging of the battery is guaranteed.
In the process of charging and heating the battery simultaneously, if the battery heating is required to be withdrawn, the vehicle can send corresponding charging requirements to the charging pile again, so that the charging pile outputs current according to the corresponding charging requirements. In another embodiment, after the step of sending a vehicle charging preparation message and a first charging requirement to the charging post if it is determined that the voltage regulation on the charging port side of the vehicle-mounted charging module is completed, so that the charging post outputs a current to charge the battery according to the first charging requirement, the method may further include:
if the battery is determined to be heated, the battery heating circuit is controlled to be closed, the low-current voltage-stabilizing charging mode is exited, and the target charging mode is reselected to be the normal-process charging mode;
and sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
The exit heating condition may be that an exit heating instruction triggered by a user is received, or the temperature of the battery reaches a predetermined temperature threshold, or the SOC of the battery is less than a predetermined electric quantity threshold, or a fault of the battery is detected. If the battery reaches the withdrawal heating condition, it is considered that the heating of the battery should be stopped at this time. At this time, the normal flow charging mode can be reselected, and a new charging requirement, namely a second charging requirement, is sent to the charging pile again. The second charging requirement may include a second target charging current value, and the charging pile may output the second target charging current value in response to the second charging requirement to charge the battery.
Wherein the second target charging current value may be greater than the first target charging current value. Since the battery is not heated while charging, the fluctuation of the battery voltage due to the heating of the battery can be not considered any more, so that charging can be performed with a larger current. Like this, under the condition of stopping heating the battery, can in time resume the mode that the heavy current that uses commonly used charges through the interaction with filling electric pile, resume the charging of higher speed promptly to do benefit to the energy can be saved.
Before closing battery heating circuit and sending the second demand of charging to filling electric pile, the vehicle can carry out appropriate regulation according to the actual voltage condition in the circuit to guarantee that subsequent charging can normally go on as far as possible. If the vehicle-mounted charging module is a vehicle-mounted charger, after the step of reselecting the target charging mode as the normal-flow charging mode, the method may further include:
judging whether the difference value between the voltage of the charging port side of the vehicle-mounted charging module and the voltage of the battery is smaller than a preset difference value threshold value or not; if the difference value is smaller than the preset difference value threshold value, controlling to switch on the direct charging circuit and controlling to switch off the vehicle-mounted charging module circuit, and charging the battery in a direct charging mode; and if the difference is larger than the preset difference threshold value, controlling to turn off the charging loop to stop charging.
In this embodiment, the step of sending the second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement may include: and if the difference value is smaller than the preset difference value threshold value, sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
That is, if the vehicle-mounted charging module is a vehicle-mounted charger, the difference between the voltage at the charging port side and the voltage of the battery needs to be sufficiently small before the battery heating is stopped and the battery is continuously charged by direct charging. If the difference is less than the predetermined difference threshold, the difference is considered to be sufficiently small. The switching circuit can be controlled to be ready for hardware connection. For example, a connection line between the vehicle dc charging port and the battery is turned on, and a connection line between the vehicle dc charging port and the vehicle-mounted charger is turned off.
If the difference is larger than the preset difference threshold value, the difference between the vehicle direct current charging port and the battery is considered to be large, after the circuit is converted, the battery is directly connected with the direct current charging port and cannot be matched with the voltage output by the charging pile, at the moment, a connecting line between the vehicle direct current charging port and the vehicle-mounted charger can be disconnected, the connecting line between the vehicle direct current charging port and the battery is not conducted, and the process is quitted according to the overtime waiting direct current charging communication.
In this embodiment, the vehicle-mounted charging module is a vehicle-mounted charger, and a better processing mode is shown when heating is stopped in the charging process, and the charging line is switched under the condition of ensuring safety, so that safe transition to large-current charging is realized.
If the vehicle-mounted charging module is a compressor or a boost DC module, on one hand, the mode of switching to direct charging for charging the battery after stopping heating can be selected. In this embodiment, after the step of reselecting the target charging mode to be the normal flow charging mode, the method may further include:
and controlling to regulate the voltage at the charging port side of the vehicle-mounted charging module to be a second target voltage, switching on the direct charging circuit, and switching off the vehicle-mounted charging module circuit to charge the battery in a direct charging mode.
In this embodiment, since it is selected to switch to charging the battery in a direct charging manner after the heating is stopped, it is only necessary to adjust the voltage on the charging port side of the in-vehicle charging module so that the adjusted voltage (second target voltage) matches the voltage of the battery.
If the vehicle-mounted charging module is a compressor or a boosting DC module, on the other hand, the vehicle-mounted charging module can be switched to charge the battery by adopting a motor boosting circuit after heating is stopped. In this embodiment, after the step of reselecting the target charging mode to be the normal flow charging mode, the method may further include:
and controlling to regulate the voltage at the charging port side of the motor boosting charging circuit to be equal to the voltage at the charging port side of the vehicle-mounted charging module, switching on the motor boosting charging circuit, and switching off the circuit of the vehicle-mounted charging module so as to boost and charge the battery by adopting the motor boosting circuit.
In this embodiment, since the selection is changed to charging the battery by using the motor boosting circuit after the heating is stopped, that is, the motor boosting circuit is directly connected to the dc charging port, the voltage on the charging port side of the motor boosting charging circuit needs to be adjusted to be equal to the voltage on the charging port side of the vehicle-mounted charging module.
In the two embodiments, the vehicle-mounted charging module is a compressor or a boost DC module, and a better processing mode is shown when heating is stopped in the charging process, and the charging line is switched under the condition of ensuring safety, so as to realize safe transition to large-current charging.
In the above embodiment, the normal flow charging mode is entered when the charging gun is inserted into the vehicle and the condition for starting the oscillating heating is not satisfied, and then during the charging process, it is required to detect whether the condition for starting the oscillating heating is satisfied (for example, triggered by a user).
In a further embodiment, on the basis of fig. 1, the method may further comprise:
if the selected target charging mode is a normal flow charging mode, detecting whether the vehicle meets the condition of starting oscillation heating or not in the process of controlling the battery to be charged; and if the vehicle meets the condition of starting oscillation heating, reselecting the target charging mode as a low-current voltage-stabilizing charging mode.
That is, in the charging process of the vehicle in the normal process charging mode, whether the vehicle meets the condition of starting oscillation heating is detected, and if so, the vehicle can be switched to the low-current voltage-stabilizing charging mode again.
For example, the condition for initiating oscillating heating includes receiving a user-triggered heating instruction. When the charging gun is inserted into a vehicle, no heating requirement exists, and later in the charging process, a user thinks that the battery temperature is low and influences the charging speed, and triggers a heating instruction, so that the condition of starting oscillation heating is met, and the charging gun can be switched to a low-current voltage-stabilizing charging mode again.
As another example, the conditions that initiate oscillatory heating include a temperature of the battery being less than a corresponding temperature threshold and a SOC of the battery being greater than a corresponding SOC threshold. When the charging gun is just inserted into the vehicle, the temperature of the battery is less than the corresponding temperature threshold, but at the same time the SOC of the battery is also less than the corresponding SOC threshold, so the heating condition is not reached. However, as the charging is carried out, the SOC of the battery is already larger than the corresponding SOC threshold value, and the temperature of the battery is still smaller than the corresponding temperature threshold value, so that the condition for starting oscillation heating is met, and the low-current voltage-stabilizing charging mode can be switched again.
Therefore, even if the battery needs to be heated in the charging process, the mode can be switched, the heating and the charging can be simultaneously carried out, and the practicability is good.
In another embodiment, on the basis of the above embodiment, if the selected target charging mode is the low-current regulated charging mode, the step of sending the first charging requirement to the charging post so that the charging post outputs a current to charge the battery according to the first charging requirement may include:
according to the voltage of the current charging port side of the vehicle, adjusting the voltage of the charging port side of the vehicle-mounted charging module to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the current charging port side of the vehicle;
if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be finished, sending a first charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement;
and controlling to charge the battery through the vehicle-mounted charging module and starting the battery heating circuit.
In the normal-flow charging mode, charging may be performed in various ways, but the voltage at the current charging port of the vehicle should be well matched with the battery voltage and the maximum output voltage of the charging post. Therefore, if a conversion to a low-current regulated charging mode is required, the voltage on the charging port side of the vehicle-mounted charging module should be adjusted to match the voltage on the current charging port side of the vehicle, and then the adjusted voltage on the current charging port side of the vehicle should match the battery voltage and the maximum output voltage of the charging post.
The matching may include: the voltage of the charging port side of the vehicle-mounted charging module is equal to the voltage of the current charging port side of the vehicle, or the voltage of the charging port side of the vehicle-mounted charging module is slightly smaller than (within a preset threshold range) the voltage of the current charging port side of the vehicle, so that the vehicle-mounted charging module with the voltage of the charging port side adjusted can normally charge the battery, the mode conversion is smooth, and the conversion effect is good.
The foregoing is a general inventive concept in this disclosure, and specific implementation details are described below by way of example.
Example one:
the vehicle-mounted charging module is a vehicle-mounted charger, and when a charging gun is inserted into a direct-current charging port of a vehicle, whether the battery is heated or not is detected, and a motor driving circuit is adopted for carrying out oscillating heating on the battery. FIG. 2 is a schematic diagram of a circuit for battery energy processing provided by an exemplary embodiment. As shown in fig. 2, the charging pile 10, the vehicle-mounted charging module 20, and the battery 30 constitute a charging circuit, and the battery 30 and the motor drive circuit 40 constitute a battery oscillating heating circuit. The first control unit 50 may be in a battery management system and the second control unit 60 may be in a motor controller.
The charging pile 10 is connected with the battery 30 through the vehicle-mounted charging module 20, the second control unit 60 is connected with the battery 30 through the motor driving circuit 40, and the first control unit 50 is respectively connected with the charging pile 10, the vehicle-mounted charging module 20, the battery 30 and the second control unit 60. First control unit 50 CAN open the return circuit that charges through CAN information interaction with on-vehicle module 20 that charges, and the electric current that will fill electric pile 10 output transmits for battery 30 through on-vehicle module 20 that charges, and make full use of fills electric pile electric energy, realizes charging for the battery when starting battery oscillation heating. In the process, the low-current constant-current output of the charging pile is realized. The circuit can effectively avoid the problem that charging pile triggering protection stops charging due to the fluctuation of the voltage of the charging circuit in the oscillating and heating process of the battery.
When the first control unit 50 controls to start the battery oscillation heating circuit, the second control unit 60 is driven to control the switching wave frequency of a power switch in the motor driving circuit, and the battery is discharged by charging the internal capacitor; the internal capacitor is discharged to charge the battery, and heat is generated in the circulation process, so that the vibration heating of the battery is realized. The aim of simultaneously carrying out battery oscillation heating charging can be achieved by controlling the two loops.
Fig. 3 is a signaling interaction diagram for battery energy handling provided by an example embodiment. In this embodiment, the vehicle-mounted charging module is a vehicle-mounted charger, and when charging and a heating demand exists, as shown in fig. 3, when the gun is plugged and the card is swiped to start direct-current charging (31-01), the first control unit obtains power for self-checking (32-01), and after detecting that the first control unit and the vehicle are free of faults, the first control unit interacts with the charging pile through a handshake message and an identification message (31-02 and 32-02). The first control unit completes the pre-charging of the vehicle main loop and attracts the vehicle main contactor, so that the vehicle is in a high-voltage state. During this process, the first control unit detects a condition (32-03) for starting the oscillation heating. If the condition of starting oscillation heating is met and the battery oscillation heating system needs to be started to heat the battery, the first control unit sends a command of 'preparing to start battery oscillation heating' to the vehicle-mounted charging module (32-04). Considering the action safety of the contactor when the two loops are switched, the vehicle-mounted charging module can be controlled to adjust the PFC capacitor voltage to the battery voltage (33-02) after receiving the instruction, and feed back the PFC capacitor voltage to the first control unit (33-03). The first control unit sends a charging parameter message (32-05) to the charging pile, compares the difference value between the PFC capacitor voltage and the battery voltage after receiving the maximum output voltage message (31-03) of the charging pile, controls the attraction contactor (K7 and K8 contactors in fig. 4) when the difference value is smaller, conducts the charging port and the vehicle-mounted charging module, and sends a charging preparation message to the charging pile (32-06). If the difference is larger, the process is quitted according to the waiting time until the direct current charging communication is overtime.
After receiving the charging pile preparation message, the first control unit sends a battery oscillation heating starting command to the vehicle-mounted charging module and the second control unit (32-07 and 32-09). Meanwhile, after receiving the charging pile readiness message, the first control unit needs to reply a charging pile charging demand and state message (32-08), wherein the demand voltage in the charging demand message needs to be larger than the voltage of the PFC capacitor, the current is the current value which can be borne by the vehicle-mounted charging module, and the charging mode is constant-current charging. And after receiving a battery oscillation heating 'starting' command, the vehicle-mounted charging module starts to adjust an internal power switch to charge the battery (33-05), and feeds back a battery oscillation heating execution state (33-04). In the charging process, the first control unit sends a charging state message to the charging pile in real time according to the charging condition of the battery. The second control unit detects the self state and the motor state without faults, and after recognizing that the battery is in the oscillation heating mode (34-01), the battery is started to oscillate and heat to charge the battery (34-02). In the process of oscillating and heating the battery, the first control unit needs to protect the battery, so that potential safety hazards of the battery and a vehicle are prevented. The first control unit detects that the exiting heating condition is met (32-10), when the exiting heating condition is met, the difference value between the voltage of the PFC capacitor and the voltage of the battery can be judged again, if the difference value is smaller, the actuation of contactors (contactors K5 and K6 in the figure 4) of the direct current charging loop is controlled, so that the direct current charging port is directly connected with the battery, the contactors (contactors K7 and K8 in the figure 4) are disconnected, the vehicle-mounted charging module is disconnected, and a battery oscillation heating 'closing' command is sent to the second control unit and the vehicle-mounted charging module (32-11), so that the output of the vehicle-mounted charging module is controlled to be stopped; after the battery oscillation heating is finished, the first control unit switches the charging demand message to a message value corresponding to the second charging demand.
If the difference is large, the direct current charging circuit contactors (contactors K5 and K6 in fig. 4) are not closed, the contactors (contactors K7 and K8 in fig. 4) are directly opened, and a battery oscillation heating "closing" command is sent to the second control unit and the vehicle-mounted charging module.
The user can actively stop charging, or when the battery charging cut-off voltage is reached, the first control unit sends a charging stopping message and a counting message (32-12) to the charging pile, and the direct current charging process is ended.
FIG. 4 is a schematic diagram of a circuit for battery energy processing provided by an exemplary embodiment. As shown in fig. 4, the positive terminal (DC +) output from the charging pile 10 is connected to the positive terminal of the battery 30 through the diode D1 and the contactor K5 in sequence, and the negative terminal (DC-) output from the charging pile 10 is connected to the negative terminal of the battery 30 through the contactor K6. The positive end of the output of the charging pile 10 is also connected with the positive electrode of the vehicle-mounted charging module 20 through a contactor K8, and the negative end of the output of the charging pile 10 is also connected with the negative electrode of the vehicle-mounted charging module 20 through a contactor K7 and an insurance D2 in sequence. The first control unit 50 is connected to the contactors K5, K6, K7, and K8, respectively, for controlling the opening and closing of the contactors.
In the embodiment of fig. 4, two contactors K7 and K8 and a fuse D2 are added to the hardware, and an anti-reverse diode D1 is added to the original contactor K5. The contactors K7 and K8 switch the vehicle charging module into the dc charging circuit and are controlled to be turned on and off by the first control unit. And the anti-reverse diode D1 is connected with the contactor K5 in series to play a role in preventing the voltage of the battery from reversely flowing to the charging pile. The contactors K5, K6 are still controlled by the first control unit to be switched on and off.
When starting direct current and charging, if need open battery vibration heating simultaneously, then when first the control unit and fill electric pile and distinguish the stage of shaking hands, first the control unit control contactor K7, K8 actuation, insert the on-vehicle module of charging into the return circuit that charges.
Example two:
fig. 5 is a signaling interaction diagram for battery energy handling provided by another example embodiment. In this embodiment, the vehicle-mounted charging module is a vehicle-mounted charger, and when a heating demand is received during charging, as shown in fig. 5, a motor driving circuit is used for dc charging (51-01 and 52-01), and when it is detected in the charging process that a condition (52-02) for starting oscillation heating is satisfied, the battery oscillation heating is performed, and if the battery oscillation heating is performed, an original dc charging loop needs to be cut off (if the battery oscillation heating is the same loop, disconnection is not required), and the vehicle-mounted charging module is switched to the vehicle-mounted charging module loop to perform dc charging while performing battery oscillation heating. When the first control unit identifies that the vehicle meets the condition of starting oscillation heating, a message of 'preparation for starting' is sent to the vehicle-mounted charging module and the second control unit (52-03), and meanwhile, a first charging requirement (52-04) is sent, so that low-current charging can be controlled. The first control unit sends charging information (DC charging flag and voltage reduction target value U1) to the vehicle charging module (52-05) to adjust the charging port side voltage to a target value U1, wherein U1 is less than or equal to the charging port side voltage of the motor driving circuit. And after the voltage regulation of the vehicle-mounted charging module is finished (53-03), the first control unit controls the attraction contactor to connect the loop of the vehicle-mounted charging module for direct current charging. The first control unit transmits charging information (52-06) for stopping charging of the motor drive circuit, and the second control unit adjusts the voltage on the charging port side, controls the motor to shut down the DC charging (54-02). The second control unit enters a battery oscillation heating process after receiving a battery oscillation heating 'starting' command (52-07) of the first control unit. And the vehicle-mounted charging module enters a battery charging process (53-04) after receiving a battery oscillation heating 'starting' command (52-07) of the first control unit. Then, the process proceeds to a charging process while oscillating and heating.
Example three:
fig. 6 is a signaling interaction diagram for battery energy handling provided by yet another example embodiment. In this embodiment, the vehicle-mounted charging module is a compressor or a boost DC module, and when charging and there is a heating demand, as shown in fig. 6, when the gun is plugged to start direct current charging, the first control unit of the vehicle obtains the power from the self-checking module itself and the vehicle has no fault, and then interacts with the charging pile through a handshake message and an identification message (61-01, 62-01, 61-02, 62-02-1). The first control unit completes the pre-charging (62-03) of the vehicle main circuit and the attraction of the vehicle main contactor, and the vehicle is in a high-voltage state. In the process, the first control unit detects that the condition for starting the oscillation heating is met (62-02-2), for example, when the battery temperature is detected to be low and the battery oscillation heating system needs to be started to heat the battery, the first control unit sends a command of 'preparing to start the battery oscillation heating' to the vehicle-mounted charging module and the second control unit (62-04). Meanwhile, the first control unit needs to send the direct-current charging flag bit and the voltage reduction target value to the vehicle-mounted charging module and the second control unit (62-04, 62-05), and considering the action safety of the contactor when the two loops are switched, the vehicle-mounted charging module is controlled to adjust the voltage on the charging port side to the first target voltage (63-02) after receiving an instruction, and the voltage reduction completion state is fed back to the first control unit (63-03). Thereafter, the first control unit controls the attraction contactors K7, K8 and transmits a charge readiness message to the charging pile (62-07). After receiving the charging pile readiness message (61-04), the first control unit sends a battery oscillation heating starting command to the vehicle-mounted charging module and the second control unit (62-09). Meanwhile, after receiving the charging pile readiness message, the first control unit needs to reply a charging pile charging demand message (62-08), wherein the demand voltage in the charging demand message needs to be larger than the reduced voltage value of the vehicle-mounted charging module, the current is the current value which can be borne by the vehicle-mounted charging module, and the charging mode is constant current charging. And after receiving a battery oscillation heating 'starting' command, the vehicle-mounted charging module starts to adjust an internal power switch to charge the battery and feeds back a battery oscillation heating execution state (63-06). In the charging process, the first control unit sends a charging state message to the charging pile (61-05) in real time according to the charging condition of the battery. The second control unit is electrified to detect the self state and the motor state without faults, and after the battery oscillation heating mode (64-01) is identified, the battery oscillation heating is started to charge the battery (64-02). In the process of oscillating and heating the battery, the first control unit needs to protect the battery, so that potential safety hazards of the battery and a vehicle are prevented. When the first control unit detects that the exit heating condition is met (62-10), for example, when the battery temperature is detected to reach the condition of turning off the battery oscillation heating, a battery oscillation heating preparation turning-off command is sent to the second control unit (62-11), and the second control unit carries out wave-off control to finish the battery oscillation heating process (64-04). Meanwhile, the first control unit adjusts a second target voltage (62-12) sent to the vehicle-mounted charging module, after the vehicle-mounted charging module receives the second target voltage, the voltage at the side of the charging port is adjusted until a full-on flag bit is fed back to the first control unit (63-07) when the module is fully opened, the first control unit judges the difference value between the voltage value at the side of the charging port fed back by the vehicle-mounted charging module and the voltage of the battery after receiving the first target voltage, if the difference value is smaller, the direct-current charging loop contactors K5 and K6 are controlled to be attracted and disconnected, the contactors K7 and K8 are controlled to be disconnected, and a battery oscillation heating 'closing' command is sent to the second control unit and the vehicle-mounted charging module (62-13) to enable the output of the closed wave to be stopped (63-08); after the battery oscillation heating is finished, the first control unit switches the charging demand message to the message value sent by the original charging control method.
If the difference is large, the direct current charging loop contactors K5 and K6 are not attracted, the contactors K7 and K8 are directly disconnected, and a battery oscillation heating 'closing' command is sent to the second control unit and the vehicle-mounted charging module.
When the vehicle user actively stops charging or reaches the battery charging cut-off voltage and fully charges, the first control unit sends a charging stopping message and a counting message (62-14) to the charging pile, and the direct current charging process is ended.
Example four:
fig. 7 is a schematic diagram of a circuit for battery energy processing provided by another exemplary embodiment. As shown in fig. 7, three contactors K7, K8, K9 and a fuse D2 are added to the hardware. The contactors K7 and K8 are used to switch the vehicle charging module into the dc charging circuit, and are controlled to be turned on and off by the first control unit. The contactor K9 is used for charging a three-phase motor charging loop. The contactors K5, K6 are still controlled by the first control unit to be switched on and off. When starting direct current and charging, if need open battery vibration heating simultaneously, then when first the control unit and fill electric pile and distinguish the stage of shaking hands, first the control unit control contactor K7, K8 actuation, insert the on-vehicle module of charging into the return circuit that charges. Meanwhile, the first control unit sends the first target voltage to the vehicle-mounted charging module, and the vehicle-mounted charging module modulates the battery voltage into the voltage value, so that the charging port voltage is the voltage value, and the output voltage specification parameters of the charging pile are matched with the charging port voltage. At this time, the first control unit obtains the output capability and the charging parameter of the charging pile and outputs the required charging current. In order to ensure that the battery oscillation heating circuit is normally opened and the vehicle-mounted charging module normally works, the charging pile can be required to output smaller charging current, and the vehicle-mounted charging module can output stable current to the battery, so that the energy output by the charging pile is transmitted to the battery. After the first control unit informs the second control unit to start the oscillation heating of the battery, the second control unit controls the switching wave frequency of a power switch inside the second control unit to charge and discharge a specific capacitor, so that the aim of heating the battery is fulfilled. After the oscillation heating process is finished, a three-phase motor is used for high-power direct-current charging by attracting contactors K9, K5 and K6.
Fig. 8 is a signaling interaction diagram for battery energy handling provided by yet another example embodiment. In this embodiment, the onboard charging module is a compressor or a boost DC module. As shown in fig. 8, in this embodiment, when the gun insertion starts the dc charging, the first control unit performs handshake message and identification message interaction with the charging pile after the self-checking module and the vehicle have no fault (81-01, 82-01, 81-02, 82-02-1). The first control unit completes the pre-charging (82-03) of the vehicle main circuit and attracts the vehicle main contactor, and the vehicle is in a high-voltage state. In the process, the first control unit detects that the condition for starting the oscillation heating is met (82-02-2), for example, when the battery temperature is detected to be low and the battery oscillation heating system needs to be started to heat the battery, the first control unit sends a command of 'preparing to start the battery oscillation heating' to the vehicle-mounted charging module (82-04). Meanwhile, the first control unit needs to send the direct-current charging flag bit and the first target voltage U1 to the vehicle-mounted charging module (82-05), and in consideration of safety of action of the contactor when the two loops are switched, the vehicle-mounted charging module is controlled to adjust the voltage on the charging port side to the target value (83-02) after receiving an instruction, and feed back the voltage reduction completion state to the first control unit (83-03), and the vehicle-mounted charging module needs to feed back the voltage U2 and the current on the charging port side to the first control unit in real time. Thereafter, the first control unit controls the attraction contactors K7, K8 and sends a charge readiness message to the charging pile (82-07). After receiving the charging pile readiness message (81-04), the first control unit sends a battery oscillation heating 'starting' command to the vehicle-mounted charging module and the second control unit (82-09). Meanwhile, after receiving the charging pile readiness message, the first control unit needs to reply a charging pile charging demand message (82-08), wherein the demand voltage in the charging demand message needs to be larger than the reduced voltage value of the vehicle-mounted charging module, the current is the current value which can be borne by the vehicle-mounted charging module, and the charging mode is constant current charging. And after receiving a battery oscillation heating 'starting' command, the vehicle-mounted charging module starts to adjust an internal power switch to charge the battery and feeds back a battery oscillation heating execution state (83-06). In the charging process, the first control unit sends a charging state message to the charging pile (81-05) in real time according to the charging condition of the battery. The second control unit is electrified to detect the self state and the motor state without faults, and after the second control unit recognizes that the battery is in the oscillation heating mode (84-01), the battery is started to oscillate and heat to charge the battery (84-02). In the process of oscillating and heating the battery, the first control unit needs to protect the battery, so that potential safety hazards of the battery and a vehicle are prevented. When the first control unit detects that the exiting heating condition is met (82-10), a battery oscillation heating 'preparation closing' command is sent to the second control unit (82-11), and the second control unit carries out wave-off control to finish the battery oscillation heating process (84-04).
In the process, the first control unit needs to send the motor voltage reduction target value U3 to the second control unit (82-12), and the motor controller control circuit adjusts the voltage on the charging port side to the voltage reduction target value U3 so as to match with the charging pile. After the adjustment is completed, the second control unit feeds back the voltage reduction completion state, the charging port side voltage U4 and the charging port side current value to the first control unit (84-05).
The first control unit judges the difference value between a charging port side voltage value U2 fed back by the vehicle-mounted charging module and a charging port side voltage value U4 fed back by the motor controller after receiving the difference value, if the difference value is smaller, the direct current charging loop contactors K5, K6 and K9 are controlled to be attracted, meanwhile, the first control unit adjusts a second target voltage U1(2-13) sent to the vehicle-mounted charging module, and after the vehicle-mounted charging module receives the difference value, the charging port side voltage is adjusted until a full-open flag bit is fed back to the first control unit (83-07) when the module is fully opened. Disconnecting the contactors K7 and K8, and sending a battery oscillation heating 'closing' command to the second control unit and the vehicle-mounted charging module (82-14) to stop the output of the second control unit and the vehicle-mounted charging module in a wave-off mode (83-08); after the oscillation heating of the battery is finished, the battery is switched to a three-phase motor control circuit for charging, and the first control unit can adjust the voltage reduction target value U3 in the charging process, so that the second control unit can adjust the voltage (82-15 and 84-06) at the charging port side, and the electric energy of the charging pile can be utilized to the maximum extent.
If the difference is large, the direct current charging loop contactors K5, K6 and K9 are not attracted, the contactors K7 and K8 are directly disconnected, and a battery oscillation heating 'closing' command is sent to the second control unit and the vehicle-mounted charging module.
When the vehicle user actively stops charging or reaches the battery charging cut-off voltage and is fully charged, the first control unit and the charging pile send a charging stopping message and a counting message (82-16), and the direct current charging process is ended (82-17, 84-07).
The present disclosure also provides a battery energy processing apparatus. Fig. 9 is a block diagram of a battery energy processing apparatus according to an exemplary embodiment. As shown in fig. 9, the apparatus may include a determination module 11, a selection module 12, and a first transmission module 13.
The determination module 11 is configured to determine a battery heating state of the vehicle when receiving the charging instruction.
The selection module 12 is configured to select a target charging mode from a plurality of preset charging modes according to a battery heating state of the vehicle, where the plurality of preset charging modes include a normal-process charging mode and a low-current regulated charging mode.
The first sending module 13 is configured to send a first charging demand to the charging pile if the selected target charging mode is the low-current voltage-stabilizing charging mode, so that the charging pile outputs a current to charge the battery according to the first charging demand.
Optionally, the determination module 11 includes a first determination submodule, a second determination submodule, and a third determination submodule.
The first determining submodule is used for determining that the battery heating state of the vehicle is a heating state if the battery is detected to be in oscillation heating.
And the second determining submodule is used for determining that the battery heating state of the vehicle is a heating demand state if the battery is detected not to be in the process of oscillating heating and the vehicle meets the condition of starting oscillating heating.
And the third determining submodule is used for determining that the battery heating state of the vehicle is a heating-free demand state if the battery is detected not to be in the process of oscillating heating and the vehicle does not meet the condition of starting oscillating heating.
Optionally, the selection module 12 comprises a first selection submodule and a second selection submodule.
The first selection submodule is used for selecting the target charging mode as a low-current voltage-stabilizing charging mode if the battery heating state of the vehicle is a heating state or a heating demand state.
And the second selection submodule is used for selecting the target charging mode as a normal flow charging mode if the battery heating state of the vehicle is a heating-demand-free state.
Optionally, the sending module 13 includes a first adjusting sub-module, a first sending sub-module and a second sending sub-module.
The first adjusting submodule is used for adjusting the voltage at the charging port side of the vehicle-mounted charging module according to the voltage of the battery and the maximum output voltage of the charging pile if the selected target charging mode is the low-current voltage-stabilized charging mode, so that the voltage at the charging port side of the vehicle-mounted charging module is matched with the voltage of the battery and the maximum output voltage of the charging pile;
the first sending submodule is used for sending a charging parameter message to the charging pile, and the vehicle voltage in the charging parameter message is the voltage at the charging port side of the vehicle-mounted charging module;
and the second sending submodule is used for sending a vehicle charging preparation message and the first charging requirement to the charging pile if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be completed, so that the charging pile can output current to charge the battery according to the first charging requirement.
Optionally, the first regulation submodule includes a second regulation submodule and a third regulation submodule.
And the second adjusting submodule is used for adjusting the voltage of the charging port side of the vehicle-mounted charging module to be equal to the voltage of the battery if the vehicle-mounted charging module is a vehicle-mounted charger.
And the third adjusting submodule is used for controlling the voltage at the charging port side of the vehicle-mounted charging module to be adjusted to a first target voltage if the vehicle-mounted charging module is a compressor or a boosting DC module, and the first target voltage is smaller than the maximum output voltage of the charging pile and smaller than the voltage of the battery.
Optionally, the apparatus 10 may further include a first control module and a second sending module.
The first control module is used for controlling to close the battery heating circuit, quit the low-current voltage-stabilizing charging mode and reselect the target charging mode as the normal-process charging mode if the condition that the battery quits the heating condition is determined.
The second sending module is used for sending a second charging requirement to the charging pile so that the charging pile can output current to charge the battery according to the second charging requirement.
Optionally, the apparatus 10 further includes a determining module, a second control module, a third control module, and a third sending module.
The judging module is used for judging whether the difference value between the voltage of the charging port side of the vehicle-mounted charging module and the voltage of the battery is smaller than a preset difference threshold value or not;
the second control module is used for controlling to switch on the direct charging circuit and controlling to switch off the vehicle-mounted charging module circuit if the difference value is judged to be smaller than the preset difference value threshold value, so that the battery is charged in a direct charging mode;
the third control module is used for controlling the charging loop to be switched off to stop charging if the difference value is judged to be larger than the preset difference value threshold;
the third sending module is used for sending the second demand of charging to filling electric pile to make and fill electric pile and charge for the battery according to second demand output current of charging, include: and if the difference value is smaller than the preset difference value threshold value, sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
Optionally, the apparatus 10 further comprises a fourth control module or a fifth control module.
The fourth control module is used for controlling the voltage at the charging port side of the vehicle-mounted charging module to be regulated to a second target voltage, switching on the direct charging circuit, and switching off the vehicle-mounted charging module circuit to charge the battery in a direct charging mode.
The fifth control module is used for controlling the voltage at the charging port side of the motor boosting charging circuit to be equal to the voltage at the charging port side of the vehicle-mounted charging module, conducting the motor boosting charging circuit and disconnecting the vehicle-mounted charging module circuit so as to boost and charge the battery by adopting the motor boosting circuit.
Optionally, the apparatus 10 further comprises a detection module and a selection module.
The detection module is used for detecting whether the vehicle meets the condition of starting oscillation heating or not in the process of controlling the battery to be charged if the selected target charging mode is the normal process charging mode;
the selection module is used for reselecting the target charging mode to be a low-current voltage-stabilizing charging mode if the vehicle meets the condition of starting oscillation heating.
Optionally, the first sending module 13 includes an adjusting module, a fourth sending module and a sixth control module.
The adjusting module is used for adjusting the voltage of the charging port side of the vehicle-mounted charging module according to the voltage of the current charging port side of the vehicle so as to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the current charging port side of the vehicle;
the fourth sending module is used for sending the first charging requirement to the charging pile if the voltage regulation on the charging port side of the vehicle-mounted charging module is judged to be finished, so that the charging pile outputs current to charge the battery according to the first charging requirement;
and the sixth control module is used for controlling the charging of the battery through the vehicle-mounted charging module and starting the battery heating circuit.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Through the technical scheme, when the charging instruction is received, if the selected target charging mode is the low-current voltage-stabilizing charging mode according to the battery heating state of the vehicle, the charging pile is controlled to output current to charge the battery according to the first charging requirement. Like this, when need go on simultaneously with battery charging and heating, send corresponding demand of charging to filling electric pile to make and fill electric pile with corresponding mode output electric energy, guarantee when battery charging, can heat the battery safely, effectively, thereby improved and used car efficiency.
The present disclosure also provides a vehicle including a battery and a processor for performing the above battery energy processing method provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (12)

1. A battery energy handling method, the method comprising:
determining a battery heating state of the vehicle when the charging instruction is received;
selecting a target charging mode from a plurality of preset charging modes according to the battery heating state of the vehicle, wherein the plurality of preset charging modes comprise a normal flow charging mode and a low current voltage stabilization charging mode;
and if the selected target charging mode is the low-current voltage-stabilizing charging mode, sending a first charging requirement to a charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement.
2. The method of claim 1, wherein determining a battery heating status of the vehicle comprises:
if the battery is detected to be in oscillation heating, determining that the battery heating state of the vehicle is a heating state;
if the battery is detected not to be in the process of oscillating heating and the vehicle meets the condition of starting oscillating heating, determining that the battery heating state of the vehicle is a heating demand state;
and if the condition that the battery is not in the process of oscillating heating and the vehicle does not meet the condition of starting oscillating heating is detected, determining that the battery heating state of the vehicle is a heating-free state.
3. The method of claim 2, wherein selecting a target charging mode from a preset plurality of charging modes according to the battery heating state of the vehicle comprises:
if the battery heating state of the vehicle is a heating state or a heating demand state, selecting a target charging mode as a low-current voltage-stabilizing charging mode;
and if the battery heating state of the vehicle is a heating-demand-free state, selecting the target charging mode as a normal-process charging mode.
4. The method of claim 3, wherein if the selected target charging mode is the low current regulated charging mode, sending a first charging demand to a charging post to cause the charging post to output current to charge the battery according to the first charging demand, comprising:
if the selected target charging mode is the low-current voltage-stabilizing charging mode, adjusting the voltage of the charging port side of a vehicle-mounted charging module according to the voltage of the battery and the maximum output voltage of the charging pile so as to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the battery and the maximum output voltage of the charging pile;
sending a charging parameter message to the charging pile, wherein the vehicle voltage in the charging parameter message is the voltage at the charging port side of the vehicle-mounted charging module;
and if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be completed, sending a vehicle charging preparation message and the first charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the first charging requirement.
5. The method of claim 4, wherein adjusting the voltage at the charging port side of the on-board charging module based on the voltage of the battery and the maximum output voltage of the charging post comprises:
if the vehicle-mounted charging module is a vehicle-mounted charger, adjusting the voltage of the charging port side of the vehicle-mounted charging module to be equal to the voltage of the battery;
and if the vehicle-mounted charging module is a compressor or a boosting DC module, controlling to regulate the voltage of the charging port side of the vehicle-mounted charging module to a first target voltage, wherein the first target voltage is smaller than the maximum output voltage of the charging pile and smaller than the voltage of the battery.
6. The method of claim 4, wherein after the step of sending a vehicle charging readiness message and the first charging demand to the charging post if it is determined that the voltage regulation on the charging port side of the vehicle-mounted charging module is complete, such that the charging post outputs a current to charge the battery according to the first charging demand, the method further comprises:
if the battery is determined to reach the condition of quitting the heating, controlling to close a battery heating circuit, quitting the low-current voltage-stabilizing charging mode, and reselecting a target charging mode as the normal-process charging mode;
and sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
7. The method of claim 6, wherein the onboard charging module is an onboard charger, and after the step of reselecting the target charging mode to the normal flow charging mode, the method further comprises:
judging whether the difference value between the voltage of the charging port side of the vehicle-mounted charging module and the voltage of the battery is smaller than a preset difference value threshold value or not;
if the difference value is smaller than the preset difference value threshold value, controlling to switch on a direct charging circuit and controlling to switch off a vehicle-mounted charging module circuit so as to charge the battery in a direct charging mode;
if the difference is larger than the preset difference threshold value, controlling to turn off the charging loop to stop charging;
sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement, and the method comprises the following steps: and if the difference value is smaller than the preset difference value threshold value, sending a second charging requirement to the charging pile so that the charging pile outputs current to charge the battery according to the second charging requirement.
8. The method of claim 6, wherein the onboard charging module is a compressor or a boost DC module, and after the step of reselecting the target charging mode to the normal flow charging mode, the method further comprises:
controlling to regulate the voltage at the charging port side of the vehicle-mounted charging module to a second target voltage, switching on a direct charging circuit, and switching off the vehicle-mounted charging module circuit to charge the battery in a direct charging mode;
alternatively, the first and second electrodes may be,
and controlling to regulate the voltage at the charging port side of the motor boosting charging circuit to be equal to the voltage at the charging port side of the vehicle-mounted charging module, switching on the motor boosting charging circuit, and switching off the vehicle-mounted charging module circuit so as to adopt the motor boosting circuit to boost and charge the battery.
9. The method of claim 1, further comprising:
if the selected target charging mode is the normal process charging mode, detecting whether the vehicle meets the condition of starting oscillation heating or not in the process of controlling the battery to be charged;
and if the vehicle meets the condition of starting oscillation heating, reselecting the target charging mode as a low-current voltage-stabilizing charging mode.
10. The method of claim 9, wherein if the selected target charging mode is the low current regulated charging mode, sending a first charging demand to a charging post to cause the charging post to output current to charge the battery according to the first charging demand, comprising:
according to the voltage of the current charging port side of the vehicle, adjusting the voltage of the charging port side of the vehicle-mounted charging module to enable the voltage of the charging port side of the vehicle-mounted charging module to be matched with the voltage of the current charging port side of the vehicle;
if the voltage regulation of the charging port side of the vehicle-mounted charging module is judged to be finished, the first charging requirement is sent to the charging pile, so that the charging pile outputs current to charge the battery according to the first charging requirement;
and controlling the vehicle-mounted charging module to charge the battery and starting the battery heating circuit.
11. A battery energy handling apparatus, the apparatus comprising:
the determining module is used for determining the heating state of the battery of the vehicle when receiving the charging instruction;
the charging control device comprises a selection module, a charging control module and a charging control module, wherein the selection module is used for selecting a target charging mode from a plurality of preset charging modes according to the battery heating state of the vehicle, and the plurality of preset charging modes comprise a normal flow charging mode and a low-current voltage-stabilizing charging mode;
the first sending module is used for sending a first charging requirement to a charging pile if the selected target charging mode is the low-current voltage-stabilizing charging mode, so that the charging pile outputs current to charge the battery according to the first charging requirement.
12. A vehicle comprising a battery and a processor configured to perform the battery energy processing method of any of claims 1-10.
CN202010501647.8A 2020-06-04 2020-06-04 Battery energy processing method and device and vehicle Active CN113752888B (en)

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