CN117080624B - Battery heating control method and system - Google Patents
Battery heating control method and system Download PDFInfo
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- CN117080624B CN117080624B CN202311178405.XA CN202311178405A CN117080624B CN 117080624 B CN117080624 B CN 117080624B CN 202311178405 A CN202311178405 A CN 202311178405A CN 117080624 B CN117080624 B CN 117080624B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 337
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012544 monitoring process Methods 0.000 claims abstract description 51
- 230000007613 environmental effect Effects 0.000 claims abstract description 29
- 238000004321 preservation Methods 0.000 claims abstract description 27
- 230000033228 biological regulation Effects 0.000 claims description 81
- 238000011156 evaluation Methods 0.000 claims description 41
- 238000004364 calculation method Methods 0.000 claims description 27
- 230000001276 controlling effect Effects 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 9
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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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
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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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Abstract
The invention discloses a battery heating control method and a system, which relate to the technical field of battery heating, and further confirm the heating power of a heating device by monitoring and analyzing the cell temperature and the environmental temperature of a battery, monitor and analyze the change of the cell temperature and the environmental temperature of the battery in the battery heating process, so as to regulate and control the heating power of the heating device in real time, analyze the heat preservation power of the heating device according to the cell temperature and the environmental temperature in the battery after the heating is finished, solve the problem of insufficient heating pertinence of the battery in different low-temperature environments in the prior art, realize the intelligent and automatic heating control of the battery in the low-temperature environments, effectively improve the uniformity and efficiency of the battery heating, improve the accuracy and effect of the battery heating, ensure the normal operation of the battery in the low-temperature environments, and further improve the working efficiency and the service life of the battery.
Description
Technical Field
The invention relates to the technical field of battery heating, in particular to a battery heating control method and system.
Background
With the continuous penetration of environmental protection concepts, more and more new energy products, such as new energy automobiles, etc., are generated, but when the temperature is low, the performance of the battery in the new energy automobiles may be affected, resulting in a decrease in battery capacity and a decrease in power output. By heating the battery, the working efficiency and the life thereof can be improved. In addition, in an extremely cold environment, battery heating can also prevent the battery from freezing and damaging, and thus control of the heating process of the battery is required.
In the prior art, the heating of the battery is controlled mainly according to the condition of the ambient temperature of the battery, and the heating is stopped when the ambient temperature reaches the preset running temperature, and obviously, the heating mode has at least the following problems: 1. in the prior art, when the battery is heated, the heating power of the heating device is not confirmed according to the ambient temperature and the temperature of the battery core in the battery, and therefore the pertinence of the heating power selection of the battery in different low-temperature states cannot be shown, the uneven heat and the loss of the battery caused by the excessively high heating rate of the heating device cannot be avoided under extremely cold conditions, on the other hand, when the battery is heated, the temperature of the battery core in the battery is mainly monitored, the ambient temperature is not monitored, the overall heating state of the battery cannot be shown, the multi-dimensional analysis of the heating effect of the subsequent battery cannot be shown, the influence of the ambient temperature on the temperature of the battery core cannot be reflected in the heating power adjustment analysis of the subsequent heating device, the heating accuracy of the heating device is reduced, and the heating effect of the battery cannot be improved.
2. In the prior art, only the heating condition of the heating equipment is controlled, and the qualification of the working temperature of the battery is not analyzed when the battery is operated, so that the qualification of the temperature of the battery during operation cannot be reflected, the temperature heat preservation power of the heating equipment cannot be analyzed and controlled, and the normal operation of the battery in a low-temperature environment cannot be ensured, thereby reducing the working efficiency and the service life of the battery.
Disclosure of Invention
The invention aims to provide a battery heating control method and a battery heating control system, which solve the problems in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme: in a first aspect, the present invention provides a battery heating control method, including: step one, temperature monitoring: monitoring the battery core temperature and the environment temperature corresponding to the battery at the current time point, further judging whether the battery at the current time point needs to be heated, and if the battery at the current time point needs to be heated, executing the second step;
step two, heating a battery: according to the battery core temperature and the environment temperature corresponding to the battery at the current time point, analyzing the heating power and the heating duration corresponding to the heating equipment, and further controlling the heating equipment to heat the battery;
step three, heating and monitoring: during the heating process of the battery by the heating equipment, distributing all the acquisition time points according to preset time intervals, further acquiring the temperature of all the acquisition points of the corresponding influence area of the battery at all the acquisition time points, and simultaneously acquiring the temperature of all the battery cores in the battery at all the acquisition time points;
step four, heating regulation: calculating a thermal mean value and a thermal increment corresponding to each acquisition time point of the battery according to the corresponding temperature of each acquisition time point of each acquisition point and the corresponding temperature of each battery core in the battery, thereby counting a thermal sign value corresponding to each acquisition time point of the battery, judging the heating condition corresponding to each acquisition time point of the battery, marking each acquisition time point with abnormal heating condition corresponding to the battery as each regulation time point, further calculating an environmental temperature influence factor corresponding to each regulation time point according to the corresponding temperature of each acquisition time point and the corresponding temperature of each battery core in the battery, and calculating a target heating power corresponding to each regulation time point of the heating device according to a thermal sign value corresponding to each regulation time point of the heating device, so as to regulate and control the heating device according to the target heating power corresponding to each regulation time point of the heating device;
fifthly, heat preservation control: when the thermal sign value corresponding to a certain acquisition time point of the battery is larger than a preset thermal sign value, heating of the heating equipment is stopped, the stopping time is taken as a starting point, monitoring points are arranged at preset time intervals, the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each battery core at each monitoring time point are monitored, the working temperature combination value corresponding to the battery is calculated, whether the working temperature corresponding to the battery is qualified or not is judged, if the working temperature corresponding to the battery is unqualified, the target heat preservation power corresponding to the heating equipment is calculated, and therefore the heating equipment is controlled according to the target heat preservation power corresponding to the heating equipment.
Preferably, the specific analysis process includes the following steps of: respectively recording the corresponding ambient temperature and the corresponding cell temperature of the battery at the current time pointIs T1 and T2, and is substituted into a calculation formulaObtaining the corresponding heating demand evaluation coefficient of the battery>Wherein->、Respectively set minimum ambient temperature and minimum cell temperature when the battery is operated>、/>Respectively setting weight factors corresponding to the environmental temperature and the battery cell temperature;
comparing the heating demand evaluation coefficient corresponding to the battery with the reference heating power and the reference heating duration corresponding to each heating demand evaluation coefficient interval stored in the database, and taking the reference heating power and the reference heating duration corresponding to the heating demand evaluation coefficient interval as the heating power and the heating duration corresponding to the heating equipment if the heating demand evaluation coefficient corresponding to the battery is in a certain heating demand evaluation coefficient interval.
Preferably, the calculating the thermal average value and the thermal increment of the battery at each collecting time point comprises the following specific calculating processes: the temperature corresponding to each collecting point at each collecting time point is recorded asWherein i represents the number corresponding to each acquisition point, i=1, 2....n, t represents the number corresponding to each acquisition time point, t=1, 2. The term p is used herein, the temperature corresponding to each electric core in the battery at each acquisition time point is recorded as +.>J represents the corresponding number of each cell, j=1, 2..m;
according to the calculation formulaObtaining the thermal average value of the battery corresponding to each acquisition time point>Wherein->Representing the temperature corresponding to the (i+1) th acquisition point at the (t) th acquisition time point,indicating the temperature of the (j+1) th cell in the battery corresponding to the (t) th acquisition time point, (-)>、/>Respectively set environmental allowable temperature difference and cell allowable temperature difference, < ->、/>Respectively setting weight factors corresponding to the temperature difference of the acquisition points and the temperature difference of the battery cells in the same time point;
according to the calculation formula，Obtaining the corresponding thermal increment of the battery at each acquisition time point>Wherein->Indicating the temperature corresponding to the ith acquisition point at the t-1 th acquisition time point,/>The temperature corresponding to the jth battery cell in the battery at the t-1 collecting time point is represented, v1 and v2 are respectively set reference environment temperature increasing rate and reference battery cell temperature increasing rate, and the temperature is represented by->、/>K1 and k2 are weight factors corresponding to the set environmental temperature increase rate and the set cell temperature increase rate, and a represents a natural constant.
Preferably, the statistics of the thermal signature values corresponding to the battery at each collection time point judges the heating condition corresponding to the battery at each collection time point, and the specific statistics and judgment process is as follows: the battery is subjected to corresponding heat mean value at each acquisition time pointAnd heat increment->Substitution of statistical formula +.>In the process, the thermal symbol value corresponding to each acquisition time point of the battery is obtained>Wherein->、/>Respectively setting weight factors corresponding to the thermal average value and the thermal increment; comparing the thermal signature value corresponding to each acquisition time point of the battery with a thermal signature value threshold stored in a database, and judging that the battery is in the battery if the thermal signature value corresponding to the battery at a certain acquisition time point is smaller than the thermal signature value thresholdThe heating condition corresponding to the acquisition time point is abnormal, and the heating condition corresponding to the acquisition time point of the battery is judged to be normal by the anti-regularization, so that the heating condition corresponding to each acquisition time point of the battery is judged.
Preferably, the calculating the target heating power corresponding to each regulation time point of the heating device includes the following specific calculation process: obtaining the standard minimum operation temperature corresponding to the battery from the database, subtracting the temperature corresponding to each battery cell at each regulation time point from the standard minimum operation temperature corresponding to the battery, obtaining the heating temperature corresponding to each battery cell at each regulation time point, and marking asWherein->Numbers corresponding to each regulation time point are indicated, < ->；
Extracting the temperature corresponding to each acquisition point at each regulation time point, further obtaining the average temperature of the environment corresponding to each regulation time point through average value calculation, and recording asCalculating the average temperature of each battery cell at each regulation time point by means of average value to obtain the average temperature of the battery at each regulation time point, and recording the average temperature as +.>And then substitutes into the calculation formulaObtaining the environmental temperature influence factor corresponding to each regulation time point>Wherein->For a set reference battery temperature and ambient temperature difference, < +.>A compensation factor corresponding to the set battery temperature and the set ambient temperature difference;
extracting the thermal symbol value corresponding to each regulation time point of the battery, and marking asAnd the thermal symbol value threshold stored in the database is marked as + ->Then substituting the formula +.>In (3) obtaining the corresponding heating evaluation coefficient of the heating equipment at each regulation time point>Wherein e represents a natural constant, < >>A compensation factor corresponding to the set heating evaluation coefficient;
comparing the heating evaluation coefficient corresponding to the heating equipment at each regulation time point with the reference heating power corresponding to each heating evaluation coefficient interval stored in the database, and if the heating evaluation coefficient corresponding to the heating equipment at a certain regulation time point is within a certain heating evaluation coefficient interval, taking the reference heating power corresponding to the heating evaluation coefficient interval as the target heating power corresponding to the heating equipment at the regulation time point, so as to analyze and obtain the target heating power corresponding to the heating equipment at each regulation time point.
Preferably, the working temperature value corresponding to the battery is calculated, and whether the working temperature corresponding to the battery is qualified or not is judged, and the specific calculation and judgment process is as follows: the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each battery cell at each monitoring time point are respectively recorded asAnd->Where r represents the number corresponding to each monitoring time point, r=1, 2.
According to the calculation formulaObtaining the corresponding working temperature value of the battery>Wherein->、/>Respectively, the set reference ambient temperature and the reference cell temperature during the battery operation>、Respectively setting weight factors corresponding to the environmental temperature combination value and the battery cell temperature combination value;
comparing the working temperature value corresponding to the battery with a working temperature value threshold stored in a database, and if the working temperature value corresponding to the battery is smaller than the working temperature value threshold, judging that the working temperature corresponding to the battery is unqualified, and judging that the working temperature corresponding to the battery is qualified by the regularization. Preferably, the calculating the target heat preservation power corresponding to the heating equipment comprises the following specific calculating process: subtracting the working temperature corresponding to the battery from the working temperature threshold to obtain a working temperature corresponding to the battery, comparing the working temperature corresponding to the battery with the reference thermal insulation power corresponding to each working temperature difference interval stored in the database, and taking the reference thermal insulation power corresponding to the working temperature difference interval corresponding to the battery as the target thermal insulation power corresponding to the heating equipment if the working temperature corresponding to the battery is within the working temperature difference interval corresponding to the battery.
In a second aspect, the present invention provides a battery heating control system comprising: the temperature monitoring module is used for monitoring the temperature of the battery core and the environmental temperature corresponding to the battery at the current time point, further judging whether the battery at the current time point needs to be heated, and sending a signal to the battery heating module if the battery at the current time point needs to be heated;
the battery heating module is used for analyzing the heating power and the heating duration corresponding to the heating equipment according to the battery core temperature and the environment temperature corresponding to the battery at the current time point, and further controlling the heating equipment to heat the battery;
the heating monitoring module is used for distributing all the acquisition time points according to preset time intervals in the process of heating the battery by the heating equipment, further acquiring the temperature of all the acquisition points of the corresponding influence area of the battery at all the acquisition time points, and simultaneously acquiring the temperature of all the battery cores in the battery at all the acquisition time points;
the heating regulation and control module is used for calculating the heat mean value and the heat increment corresponding to each acquisition time point of the battery according to the temperature corresponding to each acquisition time point of each acquisition time point and the temperature corresponding to each electric core in the battery, so as to count the heat sign value corresponding to each acquisition time point of the battery, judge the heating condition corresponding to each acquisition time point of the battery, record each acquisition time point with abnormal heating condition as each regulation time point, further calculate the environmental temperature influence factor corresponding to each regulation time point according to the temperature corresponding to each acquisition time point and the temperature corresponding to each electric core in the battery, and calculate the target heating power corresponding to each regulation time point of the heating equipment according to the heat sign value corresponding to each regulation time point of the heating equipment, thereby regulating and controlling the heating equipment according to the target heating power corresponding to each regulation time point of the heating equipment;
and the heat preservation control module is used for stopping heating of the heating equipment when the thermal sign value corresponding to a certain acquisition time point of the battery is larger than a preset thermal sign value, taking the stopping time as a starting point, arranging monitoring points at preset time intervals, further monitoring the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each electric core at each monitoring time point, calculating the working temperature combination value corresponding to the battery, judging whether the working temperature corresponding to the battery is qualified or not, and calculating the target heat preservation power corresponding to the heating equipment if the working temperature corresponding to the battery is unqualified, so that the heating equipment is controlled according to the target heat preservation power corresponding to the heating equipment.
The invention has the beneficial effects that: the invention provides a battery heating control method and a system, which monitor and analyze the cell temperature and the environment temperature of a battery to further confirm the heating power of a heating device, monitor and analyze the change of the cell temperature and the environment temperature of the battery in the heating process of the battery, so as to regulate and control the heating power of the heating device in real time, analyze the heat preservation power of the heating device according to the cell temperature and the environment temperature in the battery after the heating is finished, solve the problem of insufficient pertinence of the heating of the battery in different low-temperature environments in the prior art, realize the intelligent and automatic heating control of the battery in the low-temperature environments, effectively improve the uniformity and efficiency of the heating of the battery, improve the accuracy and effect of the heating of the battery, ensure the normal operation of the battery in the low-temperature environments, and further improve the working efficiency and service life of the battery.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the steps of the method of the present invention.
FIG. 2 is a schematic diagram of the system structure of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, in a first aspect, the present invention provides a battery heating control method, including: step one, temperature monitoring: monitoring the battery core temperature and the environment temperature corresponding to the battery at the current time point, further judging whether the battery at the current time point needs to be heated, and if the battery at the current time point needs to be heated, executing the second step;
the method is characterized in that a battery is used as a circle center, a preset length is used as a radius to form a circle, an area in the circle is an influence area corresponding to the battery, and then all acquisition points are distributed in the influence area corresponding to the battery at preset intervals, so that the temperature corresponding to each acquisition point is acquired by using a temperature sensor at the current time point, and the average temperature of the image area corresponding to the battery is obtained through average calculation and is used as the environment temperature corresponding to the battery; and acquiring the temperature corresponding to each battery cell in the battery by using a temperature sensor, and calculating the average value to obtain the average temperature of the battery cells in the battery as the temperature of the battery cells corresponding to the battery.
In a specific embodiment, the specific determining process is as follows: respectively corresponding to the set minimum environment temperature and the minimum battery core temperature when the battery operates at the current time point, and judging that the battery at the current time point needs to be heated if the environment temperature corresponding to the battery at the current time point is smaller than the minimum environment temperature when the battery operates or the battery core temperature corresponding to the battery at the current time point is smaller than the minimum battery core temperature when the battery operates; if the ambient temperature corresponding to the battery at the current time point is greater than or equal to the lowest ambient temperature when the battery operates and the battery core temperature corresponding to the battery at the current time point is greater than or equal to the lowest battery core temperature when the battery operates, the battery at the current time point is judged not to need to be heated.
Step two, heating a battery: according to the battery core temperature and the environment temperature corresponding to the battery at the current time point, analyzing the heating power and the heating duration corresponding to the heating equipment, and further controlling the heating equipment to heat the battery;
in a specific embodiment, the analysis heating device corresponds to heating power and heating duration, and a specific analysis process is as follows: respectively marking the corresponding environment temperature and the corresponding battery core temperature of the battery at the current time point as T1 and T2, and substituting the environment temperature and the corresponding battery core temperature into a calculation formulaObtaining the corresponding heating demand evaluation coefficient of the battery>Wherein、/>Respectively set minimum ambient temperature and minimum cell temperature when the battery is operated>、/>Respectively setting weight factors corresponding to the environmental temperature and the battery cell temperature;
comparing the heating demand evaluation coefficient corresponding to the battery with the reference heating power and the reference heating duration corresponding to each heating demand evaluation coefficient interval stored in the database, and taking the reference heating power and the reference heating duration corresponding to the heating demand evaluation coefficient interval as the heating power and the heating duration corresponding to the heating equipment if the heating demand evaluation coefficient corresponding to the battery is in a certain heating demand evaluation coefficient interval.
Step three, heating and monitoring: during the heating process of the battery by the heating equipment, distributing all the acquisition time points according to preset time intervals, further acquiring the temperature of all the acquisition points of the corresponding influence area of the battery at all the acquisition time points, and simultaneously acquiring the temperature of all the battery cores in the battery at all the acquisition time points;
the temperature sensor is used for collecting the temperature of each collecting point of the corresponding influence area of the battery at each collecting time point and the temperature of each electric core of the battery at each collecting time point.
Step four, heating regulation: calculating a thermal mean value and a thermal increment corresponding to each acquisition time point of the battery according to the corresponding temperature of each acquisition time point of each acquisition point and the corresponding temperature of each battery core in the battery, thereby counting a thermal sign value corresponding to each acquisition time point of the battery, judging the heating condition corresponding to each acquisition time point of the battery, marking each acquisition time point with abnormal heating condition corresponding to the battery as each regulation time point, further calculating an environmental temperature influence factor corresponding to each regulation time point according to the corresponding temperature of each acquisition time point and the corresponding temperature of each battery core in the battery, and calculating a target heating power corresponding to each regulation time point of the heating device according to a thermal sign value corresponding to each regulation time point of the heating device, so as to regulate and control the heating device according to the target heating power corresponding to each regulation time point of the heating device;
in a specific embodiment, the calculation of the thermal average value and the thermal increment of the battery at each collection time point is as follows: the temperature corresponding to each collecting point at each collecting time point is recorded asWherein i represents the number corresponding to each acquisition point, i=1, 2....n, t represents the number corresponding to each acquisition time point, t=1, 2. The term p is used herein, the temperature corresponding to each electric core in the battery at each acquisition time point is recorded as +.>J represents the corresponding number of each cell, j=1, 2..m;
according to the calculation formulaObtaining the thermal average value of the battery corresponding to each acquisition time point>Wherein->Indicating the temperature corresponding to the (i+1) th acquisition point at the (t) th acquisition time point,/->Indicating the temperature of the (j+1) th cell in the battery corresponding to the (t) th acquisition time point, (-)>、/>Respectively set environmental allowable temperature difference and cell allowable temperature difference, < ->、/>Respectively setting weight factors corresponding to the temperature difference of the acquisition points and the temperature difference of the battery cells in the same time point;
according to the calculation formula，Obtaining the corresponding thermal increment of the battery at each acquisition time point>Wherein->Indicating the temperature corresponding to the ith acquisition point at the t-1 th acquisition time point,/>The temperature corresponding to the jth battery cell in the battery at the t-1 collecting time point is represented, v1 and v2 are respectively set reference environment temperature increasing rate and reference battery cell temperature increasing rate, and the temperature is represented by->、/>K1 and k2 are weight factors corresponding to the set environmental temperature increase rate and the set cell temperature increase rate, and a represents a natural constant.
In another specific embodiment, the statistics of the thermal signature value corresponding to each collection time point of the battery, and the judgment of the heating condition corresponding to each collection time point of the battery are as follows: the battery is subjected to corresponding heat mean value at each acquisition time pointAnd heat increment->Substitution of statistical formula +.>In the process, the thermal symbol value corresponding to each acquisition time point of the battery is obtained>Wherein->、/>Respectively setting weight factors corresponding to the thermal average value and the thermal increment;
comparing the thermal sign value corresponding to each acquisition time point of the battery with a thermal sign value threshold stored in a database, if the thermal sign value corresponding to a certain acquisition time point of the battery is smaller than the thermal sign value threshold, judging that the heating condition corresponding to the acquisition time point of the battery is abnormal, and judging that the heating condition corresponding to the acquisition time point of the battery is normal by the anti-regularization, so that the heating condition corresponding to each acquisition time point of the battery is judged.
In a specific embodiment, the calculated heating devices correspond to each control time pointThe specific calculation process is as follows: obtaining the standard minimum operation temperature corresponding to the battery from the database, subtracting the temperature corresponding to each battery cell at each regulation time point from the standard minimum operation temperature corresponding to the battery, obtaining the heating temperature corresponding to each battery cell at each regulation time point, and marking asWherein->Numbers corresponding to each regulation time point are indicated, < ->；
Extracting the temperature corresponding to each acquisition point at each regulation time point, further obtaining the average temperature of the environment corresponding to each regulation time point through average value calculation, and recording asCalculating the average temperature of each battery cell at each regulation time point by means of average value to obtain the average temperature of the battery at each regulation time point, and recording the average temperature as +.>And then substitutes into the calculation formulaObtaining the environmental temperature influence factor corresponding to each regulation time point>Wherein->For a set reference battery temperature and ambient temperature difference, < +.>A compensation factor corresponding to the set battery temperature and the set ambient temperature difference;
extracting the thermal symbol value corresponding to each regulation time point of the battery, and marking asAnd the thermal symbol value threshold stored in the database is marked as + ->Then substituting the formula +.>In (3) obtaining the corresponding heating evaluation coefficient of the heating equipment at each regulation time point>Wherein e represents a natural constant, < >>A compensation factor corresponding to the set heating evaluation coefficient;
comparing the heating evaluation coefficient corresponding to the heating equipment at each regulation time point with the reference heating power corresponding to each heating evaluation coefficient interval stored in the database, and if the heating evaluation coefficient corresponding to the heating equipment at a certain regulation time point is within a certain heating evaluation coefficient interval, taking the reference heating power corresponding to the heating evaluation coefficient interval as the target heating power corresponding to the heating equipment at the regulation time point, so as to analyze and obtain the target heating power corresponding to the heating equipment at each regulation time point.
Fifthly, heat preservation control: when the thermal sign value corresponding to a certain acquisition time point of the battery is larger than a preset thermal sign value, heating of the heating equipment is stopped, the stopping time is taken as a starting point, monitoring points are arranged at preset time intervals, the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each battery core at each monitoring time point are monitored, the working temperature combination value corresponding to the battery is calculated, whether the working temperature corresponding to the battery is qualified or not is judged, if the working temperature corresponding to the battery is unqualified, the target heat preservation power corresponding to the heating equipment is calculated, and therefore the heating equipment is controlled according to the target heat preservation power corresponding to the heating equipment.
In a specific embodiment, the method calculates the corresponding working temperature of the batteryThe value, and judge whether the corresponding working temperature of the battery is qualified, the concrete calculation and judging process is as follows: the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each battery cell at each monitoring time point are respectively recorded asAnd->Where r represents the number corresponding to each monitoring time point, r=1, 2.
According to the calculation formulaObtaining the corresponding working temperature value of the battery>Wherein->、/>Respectively, the set reference ambient temperature and the reference cell temperature during the battery operation>、/>Respectively setting weight factors corresponding to the environmental temperature combination value and the battery cell temperature combination value;
comparing the working temperature value corresponding to the battery with a working temperature value threshold stored in a database, and if the working temperature value corresponding to the battery is smaller than the working temperature value threshold, judging that the working temperature corresponding to the battery is unqualified, and judging that the working temperature corresponding to the battery is qualified by the regularization.
In another specific embodiment, the calculating the target heat preservation power corresponding to the heating device specifically includes the following steps: subtracting the working temperature corresponding to the battery from the working temperature threshold to obtain a working temperature corresponding to the battery, comparing the working temperature corresponding to the battery with the reference thermal insulation power corresponding to each working temperature difference interval stored in the database, and taking the reference thermal insulation power corresponding to the working temperature difference interval corresponding to the battery as the target thermal insulation power corresponding to the heating equipment if the working temperature corresponding to the battery is within the working temperature difference interval corresponding to the battery. A step of
Referring to fig. 2, in a second aspect, the present invention provides a battery heating control method system, including: the system comprises a temperature monitoring module, a battery heating module, a heating monitoring module, a heating regulation and control module, a heat preservation control module and a database.
The temperature monitoring module is used for monitoring the temperature of the battery core and the environmental temperature corresponding to the battery at the current time point, further judging whether the battery at the current time point needs to be heated, and sending a signal to the battery heating module if the battery at the current time point needs to be heated;
the battery heating module is used for analyzing the heating power and the heating duration corresponding to the heating equipment according to the battery core temperature and the environment temperature corresponding to the battery at the current time point, and further controlling the heating equipment to heat the battery;
the heating monitoring module is used for distributing all the acquisition time points according to preset time intervals in the process of heating the battery by the heating equipment, further acquiring the temperature of all the acquisition points of the corresponding influence area of the battery at all the acquisition time points, and simultaneously acquiring the temperature of all the battery cores in the battery at all the acquisition time points;
the heating regulation and control module is used for calculating the heat mean value and the heat increment corresponding to each acquisition time point of the battery according to the temperature corresponding to each acquisition time point of each acquisition time point and the temperature corresponding to each electric core in the battery, so as to count the heat sign value corresponding to each acquisition time point of the battery, judge the heating condition corresponding to each acquisition time point of the battery, record each acquisition time point with abnormal heating condition as each regulation time point, further calculate the environmental temperature influence factor corresponding to each regulation time point according to the temperature corresponding to each acquisition time point and the temperature corresponding to each electric core in the battery, and calculate the target heating power corresponding to each regulation time point of the heating equipment according to the heat sign value corresponding to each regulation time point of the heating equipment, thereby regulating and controlling the heating equipment according to the target heating power corresponding to each regulation time point of the heating equipment;
and the heat preservation control module is used for stopping heating of the heating equipment when the thermal sign value corresponding to a certain acquisition time point of the battery is larger than a preset thermal sign value, taking the stopping time as a starting point, arranging monitoring points at preset time intervals, further monitoring the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each electric core at each monitoring time point, calculating the working temperature combination value corresponding to the battery, judging whether the working temperature corresponding to the battery is qualified or not, and calculating the target heat preservation power corresponding to the heating equipment if the working temperature corresponding to the battery is unqualified, so that the heating equipment is controlled according to the target heat preservation power corresponding to the heating equipment.
The database is used for storing the reference heating power and the reference heating duration corresponding to each heating demand evaluation coefficient interval, and storing the thermal sign value threshold, the standard minimum running temperature corresponding to the battery, the thermal sign value threshold, the reference heating power and the working temperature combination value threshold corresponding to each heating demand evaluation coefficient interval and the reference heat preservation power corresponding to each working temperature combination difference interval.
According to the embodiment of the invention, the battery core temperature and the environment temperature of the battery are monitored and analyzed, so that the heating power of the heating equipment is confirmed, the change of the battery core temperature and the environment temperature is monitored and analyzed in the battery heating process, the heating power of the heating equipment is regulated and controlled in real time, and after the heating is finished, the heat preservation power of the heating equipment is analyzed according to the battery core temperature and the environment temperature, so that the problem of insufficient pertinence of the heating of the battery in different low-temperature environments in the prior art is solved, the intelligent and automatic heating control of the battery in the low-temperature environments is realized, the uniformity and the efficiency of the heating of the battery are effectively improved, the accuracy and the effect of the heating of the battery are also improved, and the normal operation of the battery in the low-temperature environments is ensured, thereby the working efficiency and the service life of the battery are improved.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (7)
1. A battery heating control method, characterized by comprising:
step one, temperature monitoring: monitoring the battery core temperature and the environment temperature corresponding to the battery at the current time point, further judging whether the battery at the current time point needs to be heated, and if the battery at the current time point needs to be heated, executing the second step;
step two, heating a battery: according to the battery core temperature and the environment temperature corresponding to the battery at the current time point, analyzing the heating power and the heating duration corresponding to the heating equipment, and further controlling the heating equipment to heat the battery;
step three, heating and monitoring: during the heating process of the battery by the heating equipment, distributing all the acquisition time points according to preset time intervals, further acquiring the temperature of all the acquisition points of the corresponding influence area of the battery at all the acquisition time points, and simultaneously acquiring the temperature of all the battery cores in the battery at all the acquisition time points;
step four, heating regulation: calculating a thermal mean value and a thermal increment corresponding to each acquisition time point of the battery according to the corresponding temperature of each acquisition time point of each acquisition point and the corresponding temperature of each battery core in the battery, thereby counting a thermal sign value corresponding to each acquisition time point of the battery, judging the heating condition corresponding to each acquisition time point of the battery, marking each acquisition time point with abnormal heating condition corresponding to the battery as each regulation time point, further calculating an environmental temperature influence factor corresponding to each regulation time point according to the corresponding temperature of each acquisition time point and the corresponding temperature of each battery core in the battery, and calculating a target heating power corresponding to each regulation time point of the heating device according to a thermal sign value corresponding to each regulation time point of the heating device, so as to regulate and control the heating device according to the target heating power corresponding to each regulation time point of the heating device;
the thermal average value and the thermal increment corresponding to each acquisition time point of the battery are calculated, and the specific calculation process is as follows:
the temperature corresponding to each collecting point at each collecting time point is recorded asWherein i represents the number corresponding to each acquisition point, i=1, 2....n, t represents the number corresponding to each acquisition time point, t=1, 2. The term p is used herein, the temperature corresponding to each electric core in the battery at each acquisition time point is recorded as +.>J represents the corresponding number of each cell, j=1, 2..m;
according to the calculation formulaObtaining the thermal average value of the battery corresponding to each acquisition time point>Wherein->Indicating the temperature corresponding to the (i+1) th acquisition point at the (t) th acquisition time point,/->Indicating the temperature of the (j+1) th cell in the battery corresponding to the (t) th acquisition time point, (-)>Respectively set environmental allowable temperature difference and cell allowable temperature difference, < ->Respectively setting weight factors corresponding to the temperature difference of the acquisition points and the temperature difference of the battery cells in the same time point;
according to the calculation formula，Obtaining the corresponding thermal increment of the battery at each acquisition time point>Wherein->Indicating the temperature corresponding to the ith acquisition point at the t-1 th acquisition time point,/>The temperature corresponding to the jth battery cell in the battery at the t-1 collecting time point is represented, v1 and v2 are respectively set reference environment temperature increasing rate and reference battery cell temperature increasing rate, and the temperature is represented by->Respectively setting a permissible environmental temperature increase rate difference and a permissible battery cell temperature increase rate difference, wherein k1 and k2 are weight factors corresponding to the set environmental temperature increase rate and the battery cell temperature increase rate respectively, and a represents a natural constant;
fifthly, heat preservation control: when the thermal sign value corresponding to a certain acquisition time point of the battery is larger than a preset thermal sign value, heating of the heating equipment is stopped, the stopping time is taken as a starting point, monitoring points are arranged at preset time intervals, the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each battery core at each monitoring time point are monitored, the working temperature combination value corresponding to the battery is calculated, whether the working temperature corresponding to the battery is qualified or not is judged, if the working temperature corresponding to the battery is unqualified, the target heat preservation power corresponding to the heating equipment is calculated, and therefore the heating equipment is controlled according to the target heat preservation power corresponding to the heating equipment.
2. The battery heating control method according to claim 1, wherein the analysis heating device corresponds to a heating power and a heating duration, and the specific analysis process is as follows:
respectively marking the corresponding environment temperature and the corresponding battery core temperature of the battery at the current time point as T1 and T2, and substituting the environment temperature and the corresponding battery core temperature into a calculation formulaObtaining the corresponding heating demand evaluation coefficient of the battery>WhereinRespectively set minimum ambient temperature and minimum cell temperature when the battery is operated>、/>Respectively setting weight factors corresponding to the environmental temperature and the battery cell temperature;
comparing the heating demand evaluation coefficient corresponding to the battery with the reference heating power and the reference heating duration corresponding to each heating demand evaluation coefficient interval stored in the database, and taking the reference heating power and the reference heating duration corresponding to the heating demand evaluation coefficient interval as the heating power and the heating duration corresponding to the heating equipment if the heating demand evaluation coefficient corresponding to the battery is in a certain heating demand evaluation coefficient interval.
3. The method for controlling heating of a battery according to claim 1, wherein the statistics of thermal signature values corresponding to the battery at each collection time point, and the judgment of heating conditions corresponding to the battery at each collection time point are as follows: the battery is subjected to corresponding heat mean value at each acquisition time pointAnd heat increment->Substitution into statistical formulaIn the process, the thermal symbol value corresponding to each acquisition time point of the battery is obtained>Wherein->、/>Respectively setting weight factors corresponding to the thermal average value and the thermal increment;
comparing the thermal sign value corresponding to each acquisition time point of the battery with a thermal sign value threshold stored in a database, if the thermal sign value corresponding to a certain acquisition time point of the battery is smaller than the thermal sign value threshold, judging that the heating condition corresponding to the acquisition time point of the battery is abnormal, and judging that the heating condition corresponding to the acquisition time point of the battery is normal by the anti-regularization, so that the heating condition corresponding to each acquisition time point of the battery is judged.
4. The battery heating control method according to claim 3, wherein the calculation of the target heating power of the heating device at each regulation time point comprises the following specific calculation processes:
obtaining the standard minimum operation temperature corresponding to the battery from the database, subtracting the temperature corresponding to each battery cell at each regulation time point from the standard minimum operation temperature corresponding to the battery, obtaining the heating temperature corresponding to each battery cell at each regulation time point, and marking asWherein->Numbers corresponding to each regulation time point are indicated, < ->；
Extracting the temperature corresponding to each acquisition point at each regulation time point, further obtaining the average temperature of the environment corresponding to each regulation time point through average value calculation, and recording asCalculating the average temperature of each battery cell at each regulation time point by means of average value to obtain the average temperature of the battery at each regulation time point, and recording the average temperature as +.>And then substitutes into the calculation formulaObtaining the environmental temperature influence factor corresponding to each regulation time point>Wherein->For a set reference battery temperature and ambient temperature difference, < +.>A compensation factor corresponding to the set battery temperature and the set ambient temperature difference;
extracting the thermal symbol value corresponding to each regulation time point of the battery, and marking asAnd the thermal symbol value threshold stored in the database is marked as + ->Then substituting the formula +.>In (3) obtaining the corresponding heating evaluation coefficient of the heating equipment at each regulation time point>Wherein e represents a natural constant, < >>A compensation factor corresponding to the set heating evaluation coefficient;
comparing the heating evaluation coefficient corresponding to the heating equipment at each regulation time point with the reference heating power corresponding to each heating evaluation coefficient interval stored in the database, and if the heating evaluation coefficient corresponding to the heating equipment at a certain regulation time point is within a certain heating evaluation coefficient interval, taking the reference heating power corresponding to the heating evaluation coefficient interval as the target heating power corresponding to the heating equipment at the regulation time point, so as to analyze and obtain the target heating power corresponding to the heating equipment at each regulation time point.
5. The method for controlling heating of a battery according to claim 1, wherein the calculating the corresponding working temperature value of the battery and determining whether the corresponding working temperature of the battery is acceptable or not comprises the following steps: the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each battery cell at each monitoring time point are respectively recorded asAnd->Where r represents the number corresponding to each monitoring time point, r=1, 2.
According to the calculation formulaObtaining the corresponding working temperature value of the battery>Wherein->、/>Respectively, the set reference ambient temperature and the reference cell temperature during the battery operation>、/>Respectively setting weight factors corresponding to the environmental temperature combination value and the battery cell temperature combination value;
comparing the working temperature value corresponding to the battery with a working temperature value threshold stored in a database, and if the working temperature value corresponding to the battery is smaller than the working temperature value threshold, judging that the working temperature corresponding to the battery is unqualified, and judging that the working temperature corresponding to the battery is qualified by the regularization.
6. The battery heating control method according to claim 5, wherein the calculating the target heat preservation power corresponding to the heating device comprises the following specific calculating process:
subtracting the working temperature corresponding to the battery from the working temperature threshold to obtain a working temperature corresponding to the battery, comparing the working temperature corresponding to the battery with the reference thermal insulation power corresponding to each working temperature difference interval stored in the database, and taking the reference thermal insulation power corresponding to the working temperature difference interval corresponding to the battery as the target thermal insulation power corresponding to the heating equipment if the working temperature corresponding to the battery is within the working temperature difference interval corresponding to the battery.
7. A battery heating control system that performs the battery heating control method of any one of claims 1 to 6, comprising:
the temperature monitoring module is used for monitoring the temperature of the battery core and the environmental temperature corresponding to the battery at the current time point, further judging whether the battery at the current time point needs to be heated, and sending a signal to the battery heating module if the battery at the current time point needs to be heated;
the battery heating module is used for analyzing the heating power and the heating duration corresponding to the heating equipment according to the battery core temperature and the environment temperature corresponding to the battery at the current time point, and further controlling the heating equipment to heat the battery;
the heating monitoring module is used for distributing all the acquisition time points according to preset time intervals in the process of heating the battery by the heating equipment, further acquiring the temperature of all the acquisition points of the corresponding influence area of the battery at all the acquisition time points, and simultaneously acquiring the temperature of all the battery cores in the battery at all the acquisition time points;
the heating regulation and control module is used for calculating the heat mean value and the heat increment corresponding to each acquisition time point of the battery according to the temperature corresponding to each acquisition time point of each acquisition time point and the temperature corresponding to each electric core in the battery, so as to count the heat sign value corresponding to each acquisition time point of the battery, judge the heating condition corresponding to each acquisition time point of the battery, record each acquisition time point with abnormal heating condition as each regulation time point, further calculate the environmental temperature influence factor corresponding to each regulation time point according to the temperature corresponding to each acquisition time point and the temperature corresponding to each electric core in the battery, and calculate the target heating power corresponding to each regulation time point of the heating equipment according to the heat sign value corresponding to each regulation time point of the heating equipment, thereby regulating and controlling the heating equipment according to the target heating power corresponding to each regulation time point of the heating equipment;
and the heat preservation control module is used for stopping heating of the heating equipment when the thermal sign value corresponding to a certain acquisition time point of the battery is larger than a preset thermal sign value, taking the stopping time as a starting point, arranging monitoring points at preset time intervals, further monitoring the temperature corresponding to each acquisition point at each monitoring time point and the temperature corresponding to each electric core at each monitoring time point, calculating the working temperature combination value corresponding to the battery, judging whether the working temperature corresponding to the battery is qualified or not, and calculating the target heat preservation power corresponding to the heating equipment if the working temperature corresponding to the battery is unqualified, so that the heating equipment is controlled according to the target heat preservation power corresponding to the heating equipment.
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