CN113370846B - Predictive thermal management method and predictive thermal management system for battery - Google Patents
Predictive thermal management method and predictive thermal management system for battery Download PDFInfo
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- 238000001816 cooling Methods 0.000 claims description 4
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- 238000010248 power generation Methods 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—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 cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The application discloses a battery predictive thermal management method and system, which belong to the technical field of battery thermal management and comprise the steps of collecting motor participation information and temperature influence information, processing the motor participation information to obtain charging and discharging multiplying power, searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a preliminary temperature interval, selecting preliminary temperature from the preliminary temperature interval according to the temperature influence information, processing the temperature influence information to obtain a temperature influence coefficient, correcting the preliminary temperature by using the temperature influence coefficient to obtain a battery target temperature, and adjusting the temperature of a power battery based on the battery target temperature. This application can reasonable in design's battery target temperature, can make power battery temperature regulation can satisfy current and next stage driving power consumption demand, improves temperature regulation efficiency and precision, guarantees battery high pressure safety, reduces the required energy consumption of temperature regulation.
Description
Technical Field
The application relates to the technical field of battery thermal management, in particular to a battery predictive thermal management method and system.
Background
Compared with the traditional automobile, the new energy automobile has the advantages that the energy consumption is more environment-friendly, the demand on fossil fuel is small, and the new energy automobile becomes the main development direction in the market. The hybrid new energy automobile industry in China performs key attack on some new energy technologies, so that the hybrid new energy automobile has a great breakthrough in the aspects of power batteries, controllers and charging piles at present, and a lot of key technologies are mastered. The development of the hybrid new energy automobile is closely related to the power battery, and the main performance of the power battery is greatly related to the temperature of the power battery, so a reasonable thermal management system needs to be designed, and the hybrid new energy automobile has important significance for improving the dynamic property and the economical efficiency of the whole automobile.
Battery thermal Management is one of the important functions in a BMS (Battery Management System), and is mainly to maintain an optimal operating state of a Battery pack by enabling the Battery pack to always operate within an appropriate temperature range. The battery thermal management mainly comprises the functions of cooling, heating, temperature equalization and the like. The cooling and heating functions are adjusted according to the influence of the external environment temperature on the battery. The temperature equalization is used for reducing the temperature difference in the battery pack and preventing rapid attenuation caused by overheating of a certain part of batteries.
In the whole driving process of the hybrid electric vehicle, the battery can be frequently charged and discharged and used at high power, the generated heat is more, the internal temperature can be rapidly increased, the local temperature of the battery pack is too high if the battery thermal management control is unreasonable, the battery charging and discharging circulation efficiency is reduced, thermal runaway can occur seriously, and the personal safety is threatened. And the charging and discharging multiplying power of the battery is different in different temperature ranges. A reasonable thermal management control strategy is designed, the power battery can be guaranteed to work in a reasonable temperature range to fully exert the optimal performance of the power battery, the service life of the power battery is prolonged, and the dynamic property and the economical efficiency of the whole vehicle are improved.
The prior art is to maintain the battery temperature in the highest range of charge and discharge multiplying power. Because the battery is in different temperature intervals and the charging and discharging multiplying power is different, the battery temperature is maintained in the region with the highest charging and discharging multiplying power, and the quick response and the working safety of the battery can be realized. However, when the battery temperature is maintained in the region with the highest charge-discharge rate, for a hybrid vehicle, the battery does not need a large current under many working conditions, and at this time, the battery does not need to operate with a high charge-discharge rate, that is, the battery temperature does not need to be maintained in this region, which causes waste of heat management and energy consumption.
The second prior art scheme is to maintain the battery temperature within the range of the over-temperature and the under-temperature. And controlling the battery not to have temperature overrun according to the real-time temperature of the battery. The battery temperature is maintained within the over-temperature and under-temperature ranges. Under the condition, if the battery has a large current demand at the next moment, the temperature of the battery cannot respond in time to meet the normal work of a high-voltage electrical appliance, the charging and discharging rate of the battery can be limited at the moment, and even the service life and the safety of the battery are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a battery predictive thermal management method and system, which can improve the temperature regulation efficiency and reduce the energy consumption required by temperature regulation.
In order to achieve the above purposes, the technical scheme is as follows:
a first aspect of the present application provides a battery anticipatory thermal management method, comprising:
step S1, collecting and outputting motor participation degree information and temperature influence information;
step S2, processing the motor participation information to obtain a charge and discharge multiplying power, and searching a preset charge and discharge multiplying power-battery temperature interval table according to the charge and discharge multiplying power to obtain a preliminary temperature interval;
step S3, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information, processing the temperature influence information to obtain a temperature influence coefficient, and correcting the preliminary temperature by using the temperature influence coefficient to obtain a target battery temperature;
step S4, adjusting the temperature of the power battery based on the target temperature of the battery;
the motor participation information comprises road information, ramp information, road condition information and driver operation information;
the temperature influence information comprises battery temperature information, residual electric quantity information, environment temperature information, vehicle speed information of the whole vehicle and flow resistance information of a battery loop.
In some embodiments, the road information includes expressways, national roads, urban roads, and mountain roads, each road and length respectively corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the slope information comprises an ascending slope and a descending slope, the amplitude and the length of each slope are respectively corresponding to the motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the road condition information comprises traffic light road conditions, short-distance following road conditions, surrounding obstacle road conditions and congestion road conditions, each road condition corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the driver operation information comprises hand brake operation, accelerator pedal operation, brake pedal operation and auxiliary brake operation, each operation corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
In some embodiments, in step S2, the processing the motor participation information to obtain the charge and discharge rate includes:
and processing according to the road information, the ramp information, the road condition information and the motor participation degree corresponding to the driver operation information to obtain a charging and discharging multiplying factor, wherein the higher the motor participation degree is, the larger the corresponding charging and discharging multiplying factor is.
In some embodiments, the table of the charge/discharge rate-battery temperature interval corresponds to a charge/discharge rate-battery temperature curve, which is a parabola with a downward opening;
the vertex of the charge-discharge multiplying power-battery temperature curve is the optimal temperature interval when the charge-discharge multiplying power is the highest.
In some embodiments, the motor engagement information further comprises battery temperature information;
in step S2, a preset charge/discharge magnification-battery temperature interval table is searched according to the charge/discharge magnification to obtain a preliminary temperature interval, which specifically includes:
and searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a first temperature interval and a second temperature interval, and selecting an interval which is closer to the temperature of the power battery from the two intervals as a preliminary temperature interval according to the battery temperature information.
In some embodiments, in step S3, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information includes:
judging whether the battery temperature of the power battery is in a preliminary temperature range or not according to the battery temperature information, and if so, judging that the power battery is not cooled and heated in the next stage; if not, and the battery temperature of the power battery is larger than the upper limit of the interval of the preliminary temperature interval, judging that the power battery is refrigerated in the next stage; if not, and the battery temperature of the power battery is smaller than the lower limit of the interval of the preliminary temperature interval, judging that the power battery is heated in the next stage;
judging whether the residual electric quantity of the power battery is larger than an electric quantity threshold value or not according to the residual electric quantity information, if so, setting the interval upper limit of a preliminary temperature interval as the preliminary temperature of the power battery during refrigeration, and setting the interval lower limit of the preliminary temperature interval as the preliminary temperature of the power battery during heating; if not, setting the lower limit of the interval of the preliminary temperature interval as the preliminary temperature of the power battery during cooling, and setting the upper limit of the interval of the preliminary temperature interval as the preliminary temperature of the power battery during heating.
In some embodiments, in step S3, the processing the temperature influence information to obtain the temperature influence coefficient specifically further includes:
processing according to the battery temperature information to obtain the internal maximum temperature difference between all the battery cores in the power battery, and processing according to the internal maximum temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; when the power battery is used for heating, r is more than 1, and the influence factor is larger when the internal temperature difference is larger;
processing according to the power battery temperature information and the environment temperature information to obtain an external temperature difference between the power battery and an external environment, and processing according to the external temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is larger when the external temperature difference is larger; when the power battery is used for heating, r is more than or equal to 1, and the influence factor is smaller when the external temperature difference is larger;
processing according to the flow resistance information of the battery loop to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the larger the flow resistance of the battery loop, the smaller the influence factor is; when the power battery is heated, r is more than or equal to 1, and the larger the flow resistance of the battery loop is, the larger the influence factor is;
processing according to the vehicle speed information of the whole vehicle to obtain a vehicle speed difference with the lowest vehicle speed, and processing according to the vehicle speed difference to obtain an influence factor r; r is more than or equal to 1, and the larger the vehicle speed difference is, the larger the influence factor is;
and processing according to the four influence factors r to obtain a temperature influence coefficient.
A second aspect of the present application provides a battery anticipatory thermal management system comprising:
the adjusting module is used for adjusting the temperature of the power battery according to the target temperature of the battery;
the acquisition module is used for acquiring and outputting the motor participation degree information and the temperature influence information;
the processing module is used for processing the motor participation information to obtain a charging and discharging multiplying power, searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a preliminary temperature interval, processing the temperature influence information to obtain a temperature influence coefficient, selecting preliminary temperature from the preliminary temperature interval according to the temperature influence information, and correcting the preliminary temperature by using the temperature influence coefficient to obtain a target temperature of the battery;
the motor participation information comprises road information, ramp information, road condition information and driver operation information;
the temperature influence information includes battery temperature information, remaining capacity information, ambient temperature information, and battery circuit flow resistance information.
In some embodiments, the road information includes expressways, national roads, urban roads, and mountain roads, each road corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the ramp information comprises an ascending ramp and a descending ramp, each ramp corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the road condition information comprises traffic light road conditions, short-distance following road conditions, surrounding obstacle road conditions and congestion road conditions, each road condition corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the driver operation information comprises hand brake operation, accelerator pedal operation, brake pedal operation and auxiliary brake operation, each operation corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the processing module processes the road information, the ramp information, the road condition information and the motor participation degree corresponding to the driver operation information to obtain the charge and discharge multiplying power, wherein the higher the motor participation degree is, the larger the corresponding charge and discharge multiplying power is.
In some embodiments, the processing module processes the battery temperature information to obtain an internal maximum temperature difference between all battery cores inside the power battery, and processes the internal maximum temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; when the power battery is used for heating, r is more than 1, and the influence factor is larger when the internal temperature difference is larger; and
processing according to the power battery temperature information and the environment temperature information to obtain an external temperature difference between the power battery and an external environment, and processing according to the external temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is larger when the internal temperature difference is larger; when the power battery is used for heating, r is more than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; and
processing according to the flow resistance information of the battery loop to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; when the power battery is used for heating, r is more than or equal to 1, and the influence factor is larger when the internal temperature difference is larger; and
processing according to the vehicle speed information of the whole vehicle to obtain a vehicle speed difference with the lowest vehicle speed, and processing according to the vehicle speed difference to obtain an influence factor r; r is more than or equal to 1, and the larger the vehicle speed difference is, the larger the influence factor is;
and processing according to the four influence factors r to obtain a temperature influence coefficient.
The beneficial effect that technical scheme that this application provided brought includes:
the battery target temperature of reasonable design makes the temperature of power battery can in time respond to next stage driving power consumption demand, improves temperature regulation efficiency and precision, reduces the required energy consumption of temperature regulation.
Drawings
Fig. 1 is a flowchart of a predictive thermal management method for a battery according to an embodiment of the present invention.
Fig. 2 is a functional block diagram of a battery predictive thermal management system according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of the temperature of the conditioning module and the battery in an embodiment of the invention.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a battery anticipatory thermal management method, including:
and step S1, collecting and outputting the motor participation degree information and the temperature influence information.
And step S2, processing the motor participation information to obtain a charge and discharge multiplying power, and searching a preset charge and discharge multiplying power-battery temperature interval table according to the charge and discharge multiplying power to obtain a preliminary temperature interval.
And step S3, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information, processing the temperature influence information to obtain a temperature influence coefficient, and correcting the preliminary temperature by using the temperature influence coefficient to obtain the target temperature of the battery.
And step S4, adjusting the temperature of the power battery based on the target battery temperature.
The motor participation information includes road information, ramp information, road condition information, and driver operation information.
The temperature influence information comprises battery temperature information, residual electric quantity information, environment temperature information, vehicle speed information of the whole vehicle and flow resistance information of a battery loop.
In the embodiment, the motor participation degree information is used for representing the motor participation possibility, the participation degree and the whole vehicle energy consumption requirement in the driving process of the power vehicle at the next stage, and the motor participation degree is related to the charging and discharging multiplying power of the power battery. The higher the motor participation degree is, the higher the energy consumption requirement is, and the higher the charge-discharge multiplying power is. The method comprises the steps of comprehensively considering the motor participation in the next stage according to temperature influence information, further determining the optimal charging and discharging multiplying power matched with the motor participation, finally looking up a table to obtain a preliminary temperature range, avoiding the situation that the temperature of the power battery is always kept at the highest temperature (the corresponding charging and discharging multiplying power is the highest at this moment) as in the first technical scheme or the middle temperature (the corresponding charging and discharging multiplying power is centered at this moment) as in the second technical scheme, avoiding the situation that the battery temperature is unreasonable and the power utilization requirement cannot be met, avoiding the situation that the charging and discharging multiplying power is limited due to the battery temperature, enabling the charging and discharging multiplying power of the power battery to meet the driving power utilization requirement in the next stage, and avoiding invalid temperature regulation while responding the power utilization requirement in time.
The temperature influence information is used for representing the difficulty degree of adjusting the temperature of the power battery, selecting the preliminary temperature from the preliminary temperature interval according to the difficulty degree, correcting the preliminary temperature, improving the temperature adjusting efficiency and reducing the energy consumption required by temperature adjustment.
Preferably, the road information includes an expressway, a national road, an urban road, and a mountain road, each road and length respectively corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is. And acquiring road information of the next stage in front based on the map information, wherein the road information comprises high speed, national roads, mountainous areas, urban areas and the like. The motor participation in high speed, national road, urban area, and mountain area increases in sequence.
The ramp information comprises an ascending ramp and a descending ramp, the amplitude and the length of each ramp respectively correspond to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
The road condition information comprises traffic light road conditions, close-distance following road conditions, surrounding obstacle road conditions and congestion road conditions, each road condition corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is. And acquiring peripheral information of the whole vehicle based on the radar/camera, wherein the peripheral information comprises related information of short-distance vehicle following road conditions and surrounding obstacle road conditions. When traffic lights are more, close-distance car following is more, front obstacles are more, and a road is blocked, the motor participation degree is higher.
The driver operation information comprises hand brake operation, accelerator pedal operation, brake pedal operation and auxiliary brake operation, each operation corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is. The motor participation is low when the hand brake is pulled up to indicate that a driver stops the vehicle, and the motor participation is high when the hand brake is put down to indicate that the driver prepares the motor car. Deep stepping on the accelerator means that the motor participation is high when the driver wants to accelerate. The motor participation degree is higher when the driver needs to decelerate by stepping on the brake, and the motor participation degree is higher when the driver wants to brake emergently by stepping on the brake deeply. And when the auxiliary brake switch is turned on, the fact that the driver wants to stabilize the vehicle speed is shown, and the motor participation degree is high.
And processing according to the road information, the ramp information, the road condition information and the motor participation degree corresponding to the driver operation information to obtain a charging and discharging multiplying factor, wherein the higher the motor participation degree is, the larger the corresponding charging and discharging multiplying factor is.
Preferably, the whole vehicle control mode of the next stage also has influence on the motor participation, and the whole vehicle control mode comprises parking power generation, driving power generation, engine single drive, motor single drive and motor brake.
Preferably, the charging and discharging rate-battery temperature interval table corresponds to a charging and discharging rate-battery temperature curve, and the curve is a parabola with a downward opening. The vertex of the charge-discharge multiplying power-battery temperature curve is the optimal temperature interval when the charge-discharge multiplying power is the highest. The charge/discharge rate-battery temperature interval table is shown in table 1 below:
TABLE 1 Charge/discharge multiplying power-Battery temperature interval Table
Preferably, the motor participation information further includes battery temperature information.
In step S2, a preset charge/discharge multiplying power-battery temperature interval table is searched according to the charge/discharge multiplying power to obtain a preliminary temperature interval, which specifically includes:
and searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a first temperature interval and a second temperature interval, and selecting an interval which is closer to the temperature of the power battery from the two intervals as a preliminary temperature interval according to the battery temperature information.
Specifically, as shown in table 1, since the charge/discharge rate-battery temperature curve is a parabola with an opening facing downward, after a charge/discharge rate is determined, two temperature intervals corresponding to the charge/discharge rate can be selected, and which temperature interval the current battery temperature approaches is set as the preliminary temperature interval.
Preferably, in step S3, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information includes:
and judging whether the battery temperature of the power battery is in a preliminary temperature range or not according to the battery temperature information, and if so, judging that the power battery is not cooled and heated in the next stage. If not, and the battery temperature of the power battery is larger than the upper limit of the interval of the preliminary temperature interval, judging that the power battery is refrigerated in the next stage. If not, and the battery temperature of the power battery is smaller than the lower limit of the interval of the preliminary temperature interval, judging that the power battery is heated in the next stage.
Judging whether the residual electric quantity of the power battery is larger than an electric quantity threshold value or not according to the residual electric quantity information, if so, setting the interval upper limit of a preliminary temperature interval as the preliminary temperature of the power battery during refrigeration, and setting the interval lower limit of the preliminary temperature interval as the preliminary temperature of the power battery during heating; if not, setting the lower limit of the interval of the preliminary temperature interval as the preliminary temperature of the power battery during refrigeration, and setting the upper limit of the interval of the preliminary temperature interval as the preliminary temperature of the power battery during heating.
Specifically, according to the current temperature information of the battery and the preliminary temperature interval, when the power battery needs to be refrigerated at the next stage, if the residual capacity is sufficient, the temperature of the power battery is easily adjusted, the preliminary temperature when the power battery is refrigerated is set as the upper limit of the interval of the preliminary temperature interval, and the preliminary temperature when the power battery is heated is set as the lower limit of the interval of the preliminary temperature interval.
Preferably, in step S3, the processing the temperature influence information to obtain the temperature influence coefficient further includes:
and processing according to the battery temperature information to obtain the internal maximum temperature difference between all the battery cores in the power battery, and processing according to the internal maximum temperature difference to obtain the influence factor r. When the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger. When the power battery is heated, r is larger than 1, and the influence factor is larger when the internal temperature difference is larger.
And processing according to the power battery temperature information and the environment temperature information to obtain the external temperature difference between the power battery and the external environment, and processing according to the external temperature difference to obtain the influence factor r. When the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is larger when the external temperature difference is larger. When the power battery is used for heating, r is more than or equal to 1, and the influence factor is smaller when the external temperature difference is larger. And processing according to the flow resistance information of the battery loop to obtain an influence factor r. When the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the flow resistance of the battery loop is larger. When the power battery is heated, r is more than or equal to 1, and the larger the flow resistance of the battery loop, the larger the influence factor is. The larger the flow resistance of the battery loop is, the less easily the temperature of the power battery is adjusted.
And processing according to the vehicle speed information of the whole vehicle to obtain the vehicle speed difference with the lowest vehicle speed, and processing according to the vehicle speed difference to obtain the influence factor r. r is larger than or equal to 1, and the influence factor is larger when the vehicle speed difference is larger. The higher the vehicle speed, the easier the temperature of the power battery is to drop and the harder it is to rise.
And processing according to the four influence factors r to obtain a temperature influence coefficient, and multiplying the temperature influence coefficient by the initial temperature when correcting the initial temperature.
Referring to fig. 2, an embodiment of the present invention further provides a battery predictive thermal management system, including:
and the adjusting module 3 is used for adjusting the temperature of the power battery according to the target temperature of the battery.
And the acquisition module 1 is used for acquiring and outputting the motor participation degree information and the temperature influence information.
And the processing module 2 is used for processing the motor participation information to obtain a charging and discharging multiplying power, searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a preliminary temperature interval, processing the temperature influence information to obtain a temperature influence coefficient, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information, and correcting the preliminary temperature according to the temperature influence coefficient to obtain the target temperature of the battery.
The motor participation information includes road information, ramp information, road condition information, and driver operation information.
The temperature influence information includes battery temperature information, remaining capacity information, ambient temperature information, and battery circuit flow resistance information.
In this embodiment, the motor participation degree information is used for representing the motor participation degree and the energy consumption requirement in the driving process of the power automobile at the next stage, and the higher the motor participation degree is, the higher the energy consumption requirement of the battery is. The method includes the steps that motor participation in the next stage is comprehensively considered according to temperature influence information, then the optimal charging and discharging multiplying power is determined, a preliminary temperature interval is obtained by looking up a table finally, the temperature of the power battery is prevented from being kept at the highest temperature or being kept at the middle temperature all the time, the condition that the battery temperature is unreasonable and cannot meet the power consumption requirement is avoided, the charging and discharging multiplying power is prevented from being limited due to the battery temperature, the charging and discharging multiplying power of the power battery meets the driving power consumption requirement in the next stage, and invalid temperature regulation is avoided while the power consumption requirement is responded in time.
The temperature influence information is used for representing the difficulty degree of adjusting the temperature of the power battery, selecting the preliminary temperature from the preliminary temperature interval according to the difficulty degree, correcting the preliminary temperature, improving the temperature adjusting efficiency and reducing the energy consumption required by temperature adjustment.
Preferably, referring to fig. 3, the adjusting module 3 comprises:
and the heating loop is connected with the power battery and is used for heating the power battery. The heating loop comprises two loops, wherein a power battery 4 on one loop is connected with the engine 15 and the battery heating electromagnetic valve 13 through a second heat exchanger 17; and the power battery 4 on the other loop is connected with the motor system 11 and the motor water pump 10 through a four-way reversing valve 12. And the refrigeration loop is connected with the power battery and is used for refrigerating the power battery. The power battery 4 on the refrigeration loop is communicated with a battery water pump 5, a first heat exchanger 9, an A/C compressor 6, a condenser and fan 7 and a battery refrigeration electromagnetic valve 8. The heat of the battery is taken away by the flowing of the refrigerant in the refrigeration process.
Preferably, the road information includes expressways, national roads, urban roads, and mountain roads, each road corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
The ramp information comprises an ascending ramp and a descending ramp, each ramp corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
The road condition information comprises traffic light road conditions, close-distance following road conditions, surrounding obstacle road conditions and congestion road conditions, each road condition corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
The driver operation information comprises hand brake operation, accelerator pedal operation, brake pedal operation and auxiliary brake operation, each operation corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
And the processing module 2 processes the road information, the ramp information, the road condition information and the motor participation degree corresponding to the driver operation information to obtain the charge-discharge multiplying factor, wherein the higher the motor participation degree is, the larger the corresponding charge-discharge multiplying factor is.
Preferably, the processing module 2 obtains internal temperature differences among a plurality of battery cores inside the power battery according to the battery temperature information processing, and obtains the influence factor r according to the internal temperature difference processing. When the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger. When the power battery is heated, r is larger than 1, and the influence factor is larger when the internal temperature difference is larger. And
and processing according to the temperature information of the power battery and the environmental temperature information to obtain the external temperature difference between the power battery and the external environment, and processing according to the external temperature difference to obtain the influence factor r. When the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger. When the power battery is used for heating, r is more than or equal to 1, and the influence factor is larger when the internal temperature difference is larger. And
and processing according to the flow resistance information of the battery loop to obtain an influence factor r. When the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger. When the power battery is used for heating, r is more than or equal to 1, and the influence factor is larger when the internal temperature difference is larger. And
and processing according to the vehicle speed information of the whole vehicle to obtain the vehicle speed difference with the lowest vehicle speed, and processing according to the vehicle speed difference to obtain the influence factor r. When the power battery is used for refrigerating, r is larger than or equal to 1, and the larger the vehicle speed difference is, the larger the influence factor is. When the power battery is heated, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the vehicle speed difference is larger. And processing according to the four influence factors r to obtain a temperature influence coefficient.
The present application is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present application, and such modifications and improvements are also considered to be within the scope of the present application.
Claims (10)
1. A method for predictive thermal management of a battery, comprising:
step S1, collecting and outputting motor participation degree information and temperature influence information;
step S2, processing the motor participation information to obtain a charge and discharge multiplying power, and searching a preset charge and discharge multiplying power-battery temperature interval table according to the charge and discharge multiplying power to obtain a preliminary temperature interval;
step S3, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information, processing the temperature influence information to obtain a temperature influence coefficient, and correcting the preliminary temperature by using the temperature influence coefficient to obtain a target battery temperature;
step S4, adjusting the temperature of the power battery based on the target temperature of the battery;
the motor participation information comprises road information, ramp information, road condition information and driver operation information; each type of motor participation information corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is; the higher the motor participation degree is, the higher the charge-discharge multiplying power is;
the temperature influence information comprises battery temperature information, residual electric quantity information, environment temperature information, vehicle speed information of the whole vehicle and flow resistance information of a battery loop.
2. The battery anticipatory thermal management method according to claim 1, wherein the road information includes expressways, national roads, urban roads, and mountain roads, each road and length respectively corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the ramp information comprises an ascending ramp and a descending ramp, the amplitude and the length of each ramp respectively correspond to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the road condition information comprises traffic light road conditions, short-distance following road conditions, surrounding obstacle road conditions and congestion road conditions, each road condition corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the driver operation information comprises hand brake operation, accelerator pedal operation, brake pedal operation and auxiliary brake operation, each operation corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is.
3. The battery anticipatory thermal management method according to claim 2, wherein in step S2, the processing of the motor engagement information to obtain the charge-discharge rate specifically comprises:
and processing according to the road information, the ramp information, the road condition information and the motor participation degree corresponding to the driver operation information to obtain a charging and discharging multiplying factor, wherein the higher the motor participation degree is, the larger the corresponding charging and discharging multiplying factor is.
4. The battery predictive thermal management method according to claim 1, wherein the charge/discharge rate-battery temperature interval table corresponds to a charge/discharge rate-battery temperature curve, which is a parabola with an opening facing downward;
the vertex of the charge-discharge multiplying power-battery temperature curve is the optimal temperature interval when the charge-discharge multiplying power is the highest.
5. The battery predictive thermal management method as set forth in claim 4, wherein the motor engagement information further includes battery temperature information;
in step S2, a preset charge/discharge magnification-battery temperature interval table is searched according to the charge/discharge magnification to obtain a preliminary temperature interval, which specifically includes:
and searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a first temperature interval and a second temperature interval, and selecting an interval which is closer to the temperature of the power battery from the two intervals as a preliminary temperature interval according to the battery temperature information.
6. The battery predictive thermal management method according to claim 4, wherein in step S3, selecting a preliminary temperature from the preliminary temperature interval according to the temperature influence information includes:
judging whether the battery temperature of the power battery is in a preliminary temperature range or not according to the battery temperature information, and if so, judging that the power battery is not cooled and heated in the next stage; if not, and the battery temperature of the power battery is larger than the upper limit of the interval of the preliminary temperature interval, judging that the power battery is refrigerated in the next stage; if not, and the battery temperature of the power battery is smaller than the lower limit of the interval of the preliminary temperature interval, judging that the power battery is heated in the next stage;
judging whether the residual electric quantity of the power battery is larger than an electric quantity threshold value or not according to the residual electric quantity information, if so, setting the interval upper limit of a preliminary temperature interval as the preliminary temperature of the power battery during refrigeration, and setting the interval lower limit of the preliminary temperature interval as the preliminary temperature of the power battery during heating; if not, setting the lower limit of the interval of the preliminary temperature interval as the preliminary temperature of the power battery during cooling, and setting the upper limit of the interval of the preliminary temperature interval as the preliminary temperature of the power battery during heating.
7. The battery predictive thermal management method according to claim 6, wherein in step S3, the processing of the temperature influence information to obtain the temperature influence coefficient further includes:
processing according to the battery temperature information to obtain the internal maximum temperature difference among all the battery cores in the power battery, and processing according to the internal maximum temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; when the power battery is used for heating, r is more than 1, and the influence factor is larger when the internal temperature difference is larger;
processing according to the power battery temperature information and the environment temperature information to obtain an external temperature difference between the power battery and an external environment, and processing according to the external temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the larger the external temperature difference is, the larger the influence factor is; when the power battery is used for heating, r is more than or equal to 1, and the influence factor is smaller when the external temperature difference is larger;
processing according to the flow resistance information of the battery loop to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the larger the flow resistance of the battery loop is, the smaller the influence factor is; when the power battery is heated, r is more than or equal to 1, and the larger the flow resistance of the battery loop is, the larger the influence factor is;
processing according to the vehicle speed information of the whole vehicle to obtain a vehicle speed difference with the lowest vehicle speed, and processing according to the vehicle speed difference to obtain an influence factor r; r is more than or equal to 1, and the larger the vehicle speed difference is, the larger the influence factor is;
and processing according to the four influence factors r to obtain a temperature influence coefficient.
8. A battery anticipatory thermal management system, comprising:
the adjusting module is used for adjusting the temperature of the power battery according to the target temperature of the battery;
the acquisition module is used for acquiring and outputting the motor participation degree information and the temperature influence information;
the processing module is used for processing the motor participation information to obtain a charging and discharging multiplying power, searching a preset charging and discharging multiplying power-battery temperature interval table according to the charging and discharging multiplying power to obtain a preliminary temperature interval, processing the temperature influence information to obtain a temperature influence coefficient, selecting preliminary temperature from the preliminary temperature interval according to the temperature influence information, and correcting the preliminary temperature by using the temperature influence coefficient to obtain a target temperature of the battery;
the motor participation information comprises road information, ramp information, road condition information and driver operation information; each type of motor participation information corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is; the higher the motor participation degree is, the higher the charge-discharge multiplying power is;
the temperature influence information includes battery temperature information, remaining capacity information, ambient temperature information, and battery circuit flow resistance information.
9. The battery anticipatory thermal management system according to claim 8, wherein the road information includes expressways, national roads, urban roads, and mountain roads, each road corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the slope information comprises an ascending slope and a descending slope, each slope is respectively corresponding to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the road condition information comprises traffic light road conditions, short-distance following road conditions, surrounding obstacle road conditions and congestion road conditions, each road condition corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the driver operation information comprises hand brake operation, accelerator pedal operation, brake pedal operation and auxiliary brake operation, each operation corresponds to a motor participation possibility, and the higher the motor participation possibility is, the higher the corresponding motor participation degree is;
the processing module processes the road information, the ramp information, the road condition information and the motor participation degree corresponding to the driver operation information to obtain the charge and discharge multiplying power, wherein the higher the motor participation degree is, the larger the corresponding charge and discharge multiplying power is.
10. The battery predictive thermal management system according to claim 8, wherein the processing module processes the battery temperature information to obtain an internal maximum temperature difference between all battery cells inside the power battery, and processes the internal maximum temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; when the power battery is used for heating, r is more than 1, and the influence factor is larger when the internal temperature difference is larger; and
processing according to the power battery temperature information and the environment temperature information to obtain an external temperature difference between the power battery and an external environment, and processing according to the external temperature difference to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is larger when the internal temperature difference is larger; when the power battery is used for heating, r is more than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; and
processing according to the flow resistance information of the battery loop to obtain an influence factor r; when the power battery is used for refrigerating, r is more than 0 and less than or equal to 1, and the influence factor is smaller when the internal temperature difference is larger; when the power battery is used for heating, r is more than or equal to 1, and the influence factor is larger when the internal temperature difference is larger; and
processing according to the vehicle speed information of the whole vehicle to obtain a vehicle speed difference with the lowest vehicle speed, and processing according to the vehicle speed difference to obtain an influence factor r; r is more than or equal to 1, and the larger the vehicle speed difference is, the larger the influence factor is;
and processing according to the four influence factors r to obtain a temperature influence coefficient.
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