CN111674287B - Power battery temperature monitoring method and vehicle - Google Patents
Power battery temperature monitoring method and vehicle Download PDFInfo
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- CN111674287B CN111674287B CN201910181459.9A CN201910181459A CN111674287B CN 111674287 B CN111674287 B CN 111674287B CN 201910181459 A CN201910181459 A CN 201910181459A CN 111674287 B CN111674287 B CN 111674287B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a power battery temperature monitoring method and a vehicle, wherein the upper limit of the power battery temperature in a certain day is determined according to the relationship between the highest temperature of the power battery of the vehicle and the highest temperature of the environment, determining the lower limit of the temperature of the power battery in a certain day according to the relationship between the lowest temperature of the power battery of the vehicle and the lowest temperature of the environment, if the highest temperature of the power battery in the day is more than the upper limit of the temperature of the power battery in the day or the lowest temperature of the power battery is less than the lower limit of the temperature of the power battery, alarming and summarizing the alarm information, when the alarm information of at least one day meets the continuous deterioration condition of the high temperature of the power battery or the continuous deterioration condition of the low temperature of the battery, the vehicle is overhauled, uncontrollable loss caused by continuous change of abnormal problems of the battery due to insufficient monitoring of the temperature of the battery is avoided, and driving safety is improved.
Description
Technical Field
The invention belongs to the technical field of power batteries for electric vehicles, and particularly relates to a power battery temperature monitoring method and a vehicle.
Background
The safety occupies the most important position in an electric automobile power supply system, the most important part of the safety is to give an alarm to high-temperature or low-temperature faults of the battery, at present, the high-temperature or low-temperature alarm of the power battery is realized by setting a highest value and a lowest value when the power battery leaves a factory, and when the temperature of the power battery is detected to be higher than the highest value or lower than the lowest value, the alarm is controlled and corresponding control is adopted. However, the problem of high temperature of the battery is sometimes a problem of continuous deterioration, and can be found only after long-term running time, the existing alarm method can give an alarm only when the fault is very serious, and the situation that the fault is very serious in the long-term running process of the vehicle is very few, on the contrary, potential safety hazards that the temperature of the battery is too high or too low due to line aging, poor contact, battery aging and the like in the long-term use process of the power battery can cause safety accidents more easily, therefore, the alarm is given when the temperature of the power battery is very serious in the prior art, the potential safety hazards causing the temperature abnormality of the power battery are not monitored sufficiently, the detection and analysis of the power battery at the later stage are not facilitated, and further the problem of abnormal temperature of the battery is continuously deteriorated to cause uncontrollable loss.
Disclosure of Invention
The invention aims to provide a power battery temperature monitoring method and a vehicle, which are used for solving the problem of uncontrollable loss caused by continuous change of abnormal battery temperature due to insufficient monitoring of the power battery temperature in the prior art.
In order to achieve the purpose, the invention provides a power battery temperature monitoring method, which comprises the following steps:
1) acquiring power battery highest temperature data and corresponding environment highest temperature data of a vehicle to be monitored with a set model in a set region for at least one year; thereby obtaining the relation between the highest temperature of the power battery of the vehicle to be monitored with the set model and the highest temperature of the environment in the same day;
2) for the vehicle to be monitored with the set model running in the set area, acquiring the highest power battery temperature of the vehicle to be monitored in a certain day and the highest environment temperature of the same day, acquiring the upper power battery temperature limit of the same day according to the relationship and the highest environment temperature of the same day, and outputting corresponding alarm information if the highest power battery temperature of the same day is greater than the upper power battery temperature limit of the same day;
3) the alarm information of the vehicle to be monitored for at least one day is collected, and when the condition that the high temperature of the power battery continuously deteriorates is met, the vehicle to be monitored is prompted to be overhauled.
The power battery temperature upper limit of a certain day is confirmed through the relation between the power battery highest temperature of the vehicle and the environment highest temperature, if the power battery highest temperature of the day is greater than the power battery temperature upper limit of the day, then alarm is carried out, and alarm information is gathered, when the alarm information of at least one day meets the condition that the power battery high temperature continuously deteriorates, the vehicle is overhauled, uncontrollable loss caused by continuous change of the abnormal problem of the battery high temperature due to insufficient monitoring when the battery temperature is too high is avoided, and driving safety is improved.
In order to obtain the relationship between the maximum temperature of the power battery and the maximum environmental temperature, the relationship is a maximum temperature fitting curve, the maximum temperature of the power battery is taken as a longitudinal axis, the maximum environmental temperature is taken as a transverse axis, the maximum temperature related distribution of all collected data is obtained, and the maximum temperature related distribution is fitted to obtain the maximum temperature fitting curve.
In order to obtain the relationship between the highest temperature of the power battery and the highest environmental temperature, the relationship is a table corresponding to the highest temperature, and the table corresponding to the highest temperature is inquired according to the highest environmental temperature of the day to obtain the upper limit of the temperature of the power battery of the day.
In order to improve the monitoring efficiency of the temperature of the power battery, the continuous deterioration condition of the high temperature of the power battery is that alarm information appears for two consecutive days, so that the influence of random factors can be eliminated and the influence needs to be processed.
The invention also provides a vehicle which comprises a vehicle body, wherein a processor, a memory and a program stored in the memory are arranged in the vehicle body, and the processor runs the program to realize the power battery temperature monitoring method when the power battery temperature is at a high temperature.
The invention also provides a power battery temperature monitoring method, which comprises the following steps:
1) acquiring minimum temperature data of a power battery of a vehicle to be monitored with a set model of at least one year in a set area and corresponding minimum environment temperature data; thereby obtaining the relationship between the lowest temperature of the power battery of the vehicle to be monitored with the set model and the lowest environmental temperature of the same day;
2) for the vehicle to be monitored of the set model running in the set area, acquiring the lowest temperature of a power battery of the vehicle to be monitored in a certain day and the lowest temperature of the environment in the same day, acquiring the lower limit of the temperature of the power battery in the same day according to the relation and the lowest temperature of the environment in the same day, and outputting corresponding alarm information if the lowest temperature of the power battery in the same day is less than the lower limit of the temperature of the power battery in the same day;
3) the alarm information of the vehicle to be monitored for at least one day is collected, and when the condition that the low temperature of the power battery continuously deteriorates is met, the vehicle to be monitored is prompted to be overhauled.
The power battery temperature lower limit of a certain day is confirmed through the relation between the power battery minimum temperature of vehicle and the environment minimum temperature, if the power battery minimum temperature of this day is less than the power battery temperature lower limit of this day, then report to the police, and summarize alarm information, when at least alarm information of a day satisfies the power battery low temperature and continuously worsens the condition, overhaul the vehicle, the uncontrollable loss that the abnormal problem of battery low temperature that the monitoring is not enough to lead to when low to the battery temperature continuously changes and cause has been avoided, driving safety has been improved.
In order to obtain the relationship between the lowest temperature of the power battery and the lowest temperature of the environment, the relationship is a lowest temperature fitting curve, the lowest temperature of the power battery is taken as a longitudinal axis, the lowest environment temperature is taken as a transverse axis, the lowest temperature related distribution of all collected data is obtained, and the lowest temperature related distribution is fitted to obtain the lowest temperature fitting curve.
In order to obtain the relationship between the lowest temperature of the power battery and the lowest temperature of the environment, the relationship is a table corresponding to the lowest temperature, and the table corresponding to the lowest temperature is inquired according to the lowest temperature of the environment in the current day to obtain the lower limit of the temperature of the power battery in the current day.
In order to improve the monitoring efficiency of the temperature of the power battery, the low-temperature continuous deterioration condition of the power battery is that alarm information appears for two consecutive days, so that the influence of random factors can be eliminated and the influence needs to be processed.
The invention also provides a vehicle which comprises a vehicle body, wherein a processor, a memory and a program stored in the memory are arranged in the vehicle body, and the processor runs the program to realize the power battery temperature monitoring method when the power battery is at low temperature.
Drawings
FIG. 1 is a schematic diagram of a remote monitoring big data platform according to the present invention;
FIG. 2 is a schematic diagram of the temperature of a power battery of a vehicle of the present invention over time;
FIG. 3 is a schematic view of the annual air temperature variation of the vehicle operating area of the present invention;
FIG. 4 is a diagram illustrating the relationship between the maximum temperature of the power battery and the maximum temperature of the environment according to the present invention;
FIG. 5 is a diagram illustrating the relationship between the lowest temperature of the power battery and the lowest temperature of the environment according to the present invention;
FIG. 6 is a schematic diagram of an alarm curve according to the maximum temperature of the power battery and the maximum temperature of the environment;
FIG. 7 is a schematic diagram illustrating the comparison of the maximum temperatures of two vehicles according to the present invention under different operating conditions;
FIG. 8-1 is a schematic comparison of the maximum temperature of the same vehicle H606 in different zones according to the present invention;
8-2 are graphs comparing the minimum temperatures of the same vehicle H606 in different zones according to the present invention;
8-3 are schematic graphs comparing the maximum temperature of the present invention in different regions on the same vehicle H695;
8-4 are schematic diagrams comparing the minimum temperatures of the same vehicle H695 of the present invention in different locations;
FIG. 9 is a schematic comparison of the temperature of different vehicles on the same route of the present invention;
fig. 10 is a schematic diagram of determining the battery thermal insulation condition according to the relationship between the lowest temperature of the power battery and the lowest temperature of the environment.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
method example 1:
the invention discloses a power battery temperature monitoring method which is mainly applied to the aspect of safety monitoring of an electric automobile, wherein the power battery temperature monitoring comprises monitoring of a power battery at a high temperature and monitoring of the power battery at a low temperature, and the power battery temperature monitoring method comprises the following steps:
1. the method comprises the steps of establishing a power battery temperature change database, namely a remote monitoring big data platform, by collecting power battery information data of different vehicles in different regions in the country, and organically linking the power battery temperature and the environment temperature through a correlation tool to realize the functions of monitoring, forecasting and evaluating of a power supply system. The maximum temperature of a power battery every day is collected through a large remote monitoring data platform shown in fig. 1, the maximum temperature data of the power battery of a vehicle to be monitored with a set model of at least one year in a set area and corresponding environment maximum temperature data are required to be collected, the environment temperature data correspond to temperature change information of a vehicle operation area, the environment maximum temperature data are obtained through a meteorological service website, and the change situation of the maximum temperature of the power battery and the change situation of the maximum temperature of the environment of the whole year in a Zheng state area are respectively shown in fig. 2 and fig. 3.
The high-temperature data of the power battery in at least one year is collected, the running condition of the power battery at the ambient temperature all the year round can be effectively reflected, the number of vehicles to be monitored is not limited, the types of the vehicles are not limited, a plurality of different types of types can be selected, and the more the number of the selected vehicles to be monitored is, the better the reliability of the obtained result is. If the requirement on the monitoring effect is not high, the temperature data of the power battery in different time periods such as one quarter or one month, two months and the like can also be only adopted.
2. In this embodiment, power battery temperature data and environment temperature data within one year are collected, after the power battery temperature data and the environment temperature data are collected, a relationship between the highest power battery temperature of a vehicle to be monitored of a set model and the highest environment temperature of the same day is obtained, the relationship is a highest temperature fitting curve, the highest power battery temperature is taken as a longitudinal axis and the highest environment temperature is taken as a transverse axis, highest temperature correlation distributions of all collected data are obtained, and the highest temperature correlation distributions are fitted to obtain a highest temperature fitting curve, as shown in fig. 4. In another embodiment, the relationship may be a table corresponding to the highest temperature.
In the correlation diagram of the maximum temperature of the power battery to the maximum environmental temperature, due to the heating system being turned on in winter, the image is divided into two parts in the area with lower environmental temperature (<5 ℃), the upper part corresponds to the power supply system with the heating system (heating may be from the power supply system itself or from the air conditioner in the vehicle), and the lower part corresponds to the situation without heating being turned on (the part shown in oval in fig. 4). More precisely, the temperature of the power cell is determined by the ambient temperature around the power cell, so if data of the ambient temperature around the power cell can be obtained, the correlation of the temperature of the power cell to the ambient temperature is better than that of the prior art, and the width of the ellipse reflected on the image is narrower.
3. Then for a vehicle to be monitored with a set model running in a set area, acquiring the highest power battery temperature of the vehicle to be monitored in a certain day and the highest environment temperature of the same day, acquiring the upper power battery temperature limit of the same day according to a highest temperature fitting curve between the highest power battery temperature and the highest environment temperature of the same day, and outputting corresponding alarm information if the highest power battery temperature of the same day is greater than the upper power battery temperature limit of the same day; or inquiring a table corresponding to the highest environment temperature according to the highest environment temperature of the current day to obtain the upper power battery temperature limit of the current day, if the upper power battery temperature limit of the current day cannot be found in the table, calculating the upper power battery temperature limit of the current day through a difference algorithm according to the closest temperature, and if the highest power battery temperature of the current day is greater than the upper power battery temperature limit of the current day, outputting corresponding alarm information.
4. And finally, summarizing the alarm information of the vehicle to be monitored for at least one day, and prompting to overhaul the vehicle to be monitored when the condition that the high temperature of the power battery continuously deteriorates is met.
As shown in fig. 6, the curve distribution of the maximum power battery temperature in the normal state is determined according to the relationship between the maximum power battery temperature and the maximum environment temperature, a fault alarm is performed according to the curve distribution in the normal state, a vehicle above the curve in the normal state makes a fault alarm, and the vehicle continuously above the curve in the normal state needs to further troubleshoot the cause of the problem to be the power battery fault or the vehicle design fault.
The method can adopt all the vehicle correlation distribution maps to perform temperature alarm, and can also be respectively performed for different vehicle types for more accurate alarm, and the method is the same. Taking an H702 vehicle model as an example, the following description summarizes H702 vehicle data in different regions, draws a power battery highest temperature-highest ambient temperature (ambient temperature is also referred to as air temperature) distribution diagram, draws a fault alarm curve (fig. 6) above an image concentration region, and if a data point deviates from the concentration distribution region and appears above the fault alarm curve, the data point is a fault point, and needs to be alarmed and further analyzed and checked. The big data statistical method for the same vehicle type distinguishes normal temperature and abnormal temperature, and the distinction of the normal temperature and the abnormal temperature is not according to a specific numerical value like a traditional method, for example, the normal temperature and the abnormal temperature are abnormal when the temperature exceeds 55 ℃. But the power battery temperature is correlated with the ambient temperature, for example, if the maximum power battery temperature reaches 40 ℃ at the ambient temperature of 15 ℃, the fault still exists. That is, whether the temperature of the power battery is failed or not is determined not by a single value but by the ambient temperature and the temperature distribution of a plurality of vehicles of the same type. For example, when the temperature in the power battery box is slowly increased due to the fact that bolts are fastened loosely and gradually loosened, the temperature value is separated from the part with concentrated images and appears above a fault curve, and although the secondary alarm of the traditional fault alarm is far from being achieved, the temperature value can be found by the fault alarm method in the first time. The method has the advantages that the internal resistance of the power battery is slowly increased in the condition of years due to continuous charging and discharging, so that the later temperature is increased compared with the initial temperature even under the same working condition, and the method for judging whether the power battery is high in temperature or not by using a fixed data value is not applicable, but the method dynamically adopts the operation data of the power battery from the current previous year as the basis of fault alarm, and the fault alarm cannot occur as long as the temperature value does not deviate from the integral temperature distribution even if the temperature of the power battery is higher than that in the initial state.
As can be seen from fig. 6 and 8-1, 8-2, 8-3, 8-4, the same type of vehicle exhibits different curves in different regions. Under the condition of the same environmental temperature, because the vehicle types are the same, as long as the working conditions are the same (the charging and discharging multiplying power is the same, the operation time is the same, and the temperature rise is the same, so that the difference appears and reflects the temperature rise difference caused by the working condition difference instead of the environmental temperature difference in different areas. The termination temperature of the power battery is determined by the initial temperature and the temperature rise of the power battery, the initial temperature is unified by a method of the battery temperature-environment temperature correlation distribution, the remaining difference is the temperature rise, because the vehicle types are the same, the temperature rise is not caused by the thermal design of a box body or the thermal design of the whole vehicle, the remaining difference can only be the difference of the operation working conditions, and the difference of the operation working conditions is displayed by comparing two curves of different regions. Therefore, the difference of the vehicle running lines is more deeply known, and the worse operation condition is known by comparison. Taking the 0587 vehicle and the 0110 vehicle in fig. 4 as an example, it can be seen from fig. 7 that the working condition of the 0587 vehicle is worse than that of the 0110 vehicle (the working condition includes not only driving but also charging). Because the same line usually has a plurality of vehicles to operate simultaneously, the more the vehicles, the more reliable the data that obtains, this has avoided the contingency that simply carries out the road test to one or two cars and has brought and has leaded and actually break away from. Because it is practically impossible to perform a large-scale long-time continuous experiment for each vehicle, mass real vehicle data monitored remotely becomes the most convenient and reliable tool for knowing the actual operation of the vehicle. The method for associating the maximum temperature and the minimum temperature of the power battery with the maximum air temperature and the minimum air temperature respectively brings convenience to difference of excavation working conditions.
The difference of thermal design of different vehicles caused by data of different vehicles in the same area is also studied in the embodiment, as shown in fig. 9, if the operation lines are completely the same, two types of vehicles exist on the operation lines, the difference of thermal design of the two types of vehicles can be conveniently compared, and by comparing multiple types of vehicles, which type of vehicle is reliably distinguished has higher temperature rise. Because the influence of the initial temperature and the working condition of the environment is eliminated, the rest is only the difference of the thermal design, the difference of the thermal design is conveniently found out, and the thermal design capability is improved. But more often there is only one vehicle type on the same route. In this case, the differences between the different vehicles are compared. Because the ambient temperature, operating conditions, and thermal design are substantially the same, under normal conditions, no significant differences should occur. If a plurality of vehicles of the same vehicle type run on one line, the temperature distribution graph of the power battery drawn by the running data of the plurality of vehicles and the ambient temperature provides the temperature distribution under the normal working condition of the power battery. If an individual vehicle locally generates heat due to a fault, it is found that the point on the curve deviates from the normal region. This is usually due to two reasons, the first being the power cell itself and the second being external, there may be problems with other accessory heating or insulation of the cabin not being done well. With the method of correlation distribution, problems can be quickly found. If a temperature probe is arranged in the power battery compartment and the temperature is replaced by the temperature probe to form a correlation map, the difference of the temperature probe can be used for judging whether the power battery is caused by the power battery or caused by the external factors.
Method example 2:
the embodiment mainly describes a method for monitoring the temperature of a battery when the battery is at low temperature, which comprises the following steps:
(1) the method comprises the steps of establishing a battery temperature change database, namely a remote monitoring big data platform, by collecting power battery information data of different vehicles in different regions in the country, and organically linking the power battery temperature and the environmental temperature through a correlation tool to realize the functions of monitoring, forecasting and evaluating of a power supply system. The method includes the steps that the maximum temperature of a power battery every day is collected through a remote monitoring big data platform shown in fig. 1, minimum temperature data of the power battery of a vehicle to be monitored with a set model of at least one year in a set area and corresponding environment minimum temperature data are required to be collected, the environment temperature data correspond to temperature change information of a vehicle operation area, the environment minimum temperature data are obtained through a meteorological service website, and fig. 2 and 3 respectively show the change situation of the minimum temperature of the power battery and the change situation of the annual environment minimum temperature of a Zheng state area.
The low-temperature data of the power battery in at least one year is collected, the running condition of the power battery at the ambient temperature all the year round can be effectively reflected, the number of vehicles to be monitored is not limited, the types of the vehicles are not limited, a plurality of different types of types can be selected, and the more the number of the selected vehicles to be monitored is, the better the reliability of the obtained result is. If the requirement on the monitoring effect is not high, the temperature data of the power battery in different time periods such as one quarter or one month, two months and the like can also be only adopted.
(2) In this embodiment, power battery temperature data and environment temperature data within one year are collected, after the power battery temperature data and the environment temperature data are collected, a relationship between the minimum temperature of the power battery of the vehicle to be monitored of a set model and the minimum temperature of the environment of the same day is obtained, the relationship is a minimum temperature fitting curve, the minimum temperature of the power battery is taken as a longitudinal axis and the minimum temperature of the environment is taken as a transverse axis, the minimum temperature related distribution of all collected data is obtained, and the minimum temperature related distribution is fitted to obtain a minimum temperature fitting curve, as shown in fig. 5. In another embodiment, the relationship may be a table corresponding to the lowest temperature.
In the power battery lowest temperature-environment lowest temperature correlation distribution diagram, the images are distributed in an oval shape from the bottom left to the top right, and the distribution area is narrow, so that the strong correlation exists between the images.
(3) Then for a vehicle to be monitored of a set model running in a set area, acquiring the highest power battery temperature of the vehicle to be monitored in a certain day and the highest environment temperature of the same day, obtaining the lower power battery temperature limit of the same day according to a lowest temperature fitting curve between the lowest power battery temperature and the lowest environment temperature of the same day, and outputting corresponding alarm information if the lowest power battery temperature of the same day is lower than the lower power battery temperature limit of the same day; or inquiring a table corresponding to the lowest environment temperature according to the lowest environment temperature of the current day to obtain the lower power battery temperature limit of the current day, if the lower power battery temperature limit of the current day cannot be found in the table, calculating the lower power battery temperature limit of the current day through a difference algorithm according to the closest temperature, and if the highest power battery temperature of the current day is lower than the lower power battery temperature limit of the current day, outputting corresponding alarm information.
Determining the curve distribution of the lowest temperature of the power battery under the normal state according to the relation between the lowest temperature of the power battery and the lowest temperature of the environment, performing fault alarm according to the curve distribution under the normal state, making fault alarm for the vehicle under the curve under the normal state, and continuously checking the reason of the problem of the vehicle under the curve under the normal state to further find out the fault of the power battery or the design fault of the vehicle.
(4) And finally, summarizing the alarm information of the vehicle to be monitored for at least one day, and prompting to overhaul the vehicle to be monitored when the low-temperature continuous deterioration condition of the power battery is met.
The heat preservation condition of the power battery can be determined according to the relation between the lowest temperature of the power battery and the lowest temperature of the environment, and two boundary lines are drawn at the upper end and the lower end of the temperature distribution image in the graph of fig. 5. The high temperature is caused by the running of the vehicle, and the vehicle is placed out of operation when the temperature is low. The lower boundary line is therefore a straight line with a slope of 1, which means that the lowest point of the lowest temperature of the power battery is equal to the ambient lowest temperature. The upper boundary line of the image usually represents the temperature of a vehicle which just starts to drive in a new day, the temperature is related to the heat preservation effect of the power battery, the vehicles running in the alpine region are provided with heat preservation designs, and the temperature of the power battery cannot be directly reduced to the ambient temperature after the power battery is placed at night, so that the heat preservation effect of the vehicle can be better judged by comparing different vehicles. This is only for the vehicle in the alpine region, and good heat preservation effect for the vehicle in the ordinary region means that this heat dissipation is poor, as shown in fig. 10.
Vehicle embodiment 1:
the invention provides a vehicle which comprises a vehicle body, wherein a processor, a memory and a program stored in the memory are arranged in the vehicle body, and the processor runs the program to realize the power battery temperature monitoring method when the power battery temperature is at a high temperature. The program run by the processor is a step corresponding to the method in embodiment 1, and the monitoring method when the temperature of the power battery is high is described in detail in embodiment 1, and therefore is not described herein again.
Vehicle embodiment 2:
the invention also provides a vehicle which comprises a vehicle body, wherein a processor, a memory and a program stored in the memory are arranged in the vehicle body, and the processor runs the program to realize the power battery temperature monitoring method when the power battery is at low temperature. The program run by the processor is a step corresponding to the method in embodiment 2, and the monitoring method when the temperature of the power battery is high is described in detail in embodiment 2, so that details are not described here.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. A power battery temperature monitoring method is characterized by comprising the following steps:
1) acquiring power battery highest temperature data and corresponding environment highest temperature data of a vehicle to be monitored with a set model in a set region for at least one year; thereby obtaining the relation between the highest temperature of the power battery of the vehicle to be monitored with the set model and the highest temperature of the environment in the same day;
2) for the vehicle to be monitored with the set model running in the set area, acquiring the highest power battery temperature of the vehicle to be monitored in a certain day and the highest environment temperature of the same day, acquiring the upper power battery temperature limit of the same day according to the relationship and the highest environment temperature of the same day, and outputting corresponding alarm information if the highest power battery temperature of the same day is greater than the upper power battery temperature limit of the same day;
3) summarizing alarm information of the vehicle to be monitored for at least one day, and prompting the vehicle to be monitored to be overhauled when the condition of continuous deterioration of the power battery at high temperature is met;
the relation is a maximum temperature fitting curve, the maximum temperature of the power battery is taken as a longitudinal axis, the maximum environmental temperature is taken as a transverse axis, maximum temperature related distribution of all collected data is obtained, and the maximum temperature related distribution is fitted to obtain the maximum temperature fitting curve; or the relation is a table corresponding to the highest temperature, and the table corresponding to the highest environmental temperature is inquired according to the highest environmental temperature of the day to obtain the upper limit of the temperature of the power battery of the day.
2. The power battery temperature monitoring method according to claim 1, wherein the power battery high temperature continuous deterioration condition is that alarm information appears for two consecutive days.
3. A power battery temperature monitoring method is characterized by comprising the following steps:
1) acquiring minimum temperature data of a power battery of a vehicle to be monitored with a set model of at least one year in a set area and corresponding minimum environment temperature data; thereby obtaining the relationship between the lowest temperature of the power battery of the vehicle to be monitored with the set model and the lowest environmental temperature of the same day;
2) for the vehicle to be monitored of the set model running in the set area, acquiring the lowest temperature of a power battery of the vehicle to be monitored in a certain day and the lowest temperature of the environment in the same day, acquiring the lower limit of the temperature of the power battery in the same day according to the relation and the lowest temperature of the environment in the same day, and outputting corresponding alarm information if the lowest temperature of the power battery in the same day is less than the lower limit of the temperature of the power battery in the same day;
3) summarizing alarm information of the vehicle to be monitored for at least one day, and prompting the vehicle to be monitored to be overhauled when the low-temperature continuous deterioration condition of the power battery is met;
the relation is a minimum temperature fitting curve, the minimum temperature of the power battery is taken as a longitudinal axis, the minimum environment temperature is taken as a transverse axis, the minimum temperature related distribution of all collected data is obtained, and the minimum temperature related distribution is fitted to obtain the minimum temperature fitting curve; or the relation is a table corresponding to the lowest temperature, and the table corresponding to the lowest temperature is inquired according to the lowest environment temperature of the day to obtain the lower limit of the temperature of the power battery of the day.
4. The power battery temperature monitoring method according to claim 3, wherein the power battery low-temperature continuous deterioration condition is that alarm information appears for two consecutive days.
5. A vehicle comprising a vehicle body in which a processor, a memory, and a program stored in the memory are provided, wherein the processor executes the program to implement the power battery temperature monitoring method according to any one of claims 1-2.
6. A vehicle comprising a vehicle body in which a processor, a memory, and a program stored in the memory are provided, wherein the processor executes the program to implement the power battery temperature monitoring method according to any one of claims 3 to 4.
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