CN117110914A - Battery temperature measuring method and device, electronic equipment and storage medium - Google Patents
Battery temperature measuring method and device, electronic equipment and storage medium Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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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Abstract
The application is applicable to the technical field of batteries, and provides a battery temperature measurement method, a device, electronic equipment and a storage medium, wherein the battery temperature measurement method comprises the following steps: applying an excitation signal to a battery core of a battery to be detected to obtain the current impedance parameter of the battery core, wherein the excitation signal is alternating current or alternating voltage; and determining the equivalent temperature of the battery cell according to the current impedance parameter and a preset first association relation, wherein the first association relation describes the corresponding relation between the impedance parameter of the battery cell to be detected and the equivalent temperature of the battery cell, and the equivalent temperature of the battery cell is measured through the relation between the impedance parameter of the battery cell to be detected and the equivalent temperature of the battery cell, so that the measurement is convenient, a sensor is not needed, and the cost is saved. The equivalent temperature can more accurately represent the actual temperature of the battery cell than the outer surface temperature of the battery cell, thereby improving the accuracy of the temperature measurement of the battery.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method and an apparatus for measuring battery temperature, an electronic device, and a storage medium.
Background
With the improvement of living standard, various batteries (battery packs) are increasingly used in daily life. For example, the power battery is used as a core component of an electric vehicle, and the performance of the power battery in the electric vehicle is greatly affected by temperature, so in order to ensure the performance of the power battery, it is necessary to monitor the temperature of the battery and adjust the temperature of the battery according to the monitored temperature.
The sensor can not be buried in the battery of the power utilization device to measure the internal temperature of the battery core of the battery at present, and in the operation process of the battery core, the internal actual temperature of the battery core is far higher than the external surface temperature of the battery core, and the current actual temperature of the battery can not be accurately represented through the external surface temperature of the battery core of the battery.
Disclosure of Invention
The application provides a battery temperature measurement method, a device, electronic equipment and a storage medium, wherein an excitation signal is applied to a battery core of a battery to obtain a current impedance parameter of the battery core, the equivalent temperature of the battery core is determined according to the corresponding relation between the impedance parameter and the equivalent temperature of the battery core, the equivalent temperature of the battery core is measured according to the relation between the equivalent temperature and the impedance parameter, so that the accuracy of temperature measurement is improved, and the equivalent temperature of the battery core can represent the actual temperature of the battery core more accurately than the surface temperature of the battery core.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, there is provided a battery temperature measurement method including: applying an excitation signal to a battery cell of a battery to be detected to obtain a current impedance parameter of the battery cell, wherein the excitation signal is alternating current or alternating voltage, and the impedance parameter comprises at least one of impedance, resistance and capacitance of the battery cell of the battery to be detected; and determining the equivalent temperature of the battery cell according to the current impedance parameter and a preset first association relation, wherein the first association relation describes the corresponding relation between the impedance parameter of the battery cell of the battery to be detected and the equivalent temperature of the battery cell.
By adopting the technical scheme, the current impedance parameter of the battery to be detected is determined by applying the excitation signal to the battery cell of the battery to be detected, and the equivalent temperature of the battery cell of the battery to be detected can be determined according to the relation between the impedance parameter and the equivalent temperature of the battery cell. According to the battery temperature measurement method, the equivalent temperature of the battery core of the battery is measured according to the relation between the impedance parameter and the equivalent temperature of the battery core, so that the battery temperature measurement method is convenient to realize, the equivalent temperature of the battery core can be measured without a sensor, and the cost is saved. The equivalent temperature is the average temperature of the battery core of the battery, and compared with the outer surface temperature of the battery core of the battery, the equivalent temperature can more accurately represent the actual temperature of the battery core of the battery, so that the accuracy of temperature measurement of the battery can be improved.
In a possible implementation manner of the first aspect, the method further includes: acquiring the surface temperature of the battery core of the battery to be detected; and determining the internal temperature of the battery cell according to the surface temperature, the equivalent temperature and a preset second association relation, wherein the second association relation describes the corresponding relation between the surface temperature, the equivalent temperature and the internal temperature.
By adopting the technical scheme, after the equivalent temperature of the battery to be detected is determined, the internal temperature of the battery cell is determined according to the surface temperature, the equivalent temperature and the preset second association relation, and the measurement of the internal temperature of the battery cell of the battery to be detected does not need to be provided with a sensor inside the battery cell of the battery to be detected, so that the battery cell is convenient to realize. And the internal temperature is determined by the equivalent temperature of the battery core, the surface temperature and the second association relation, the surface temperature can be directly measured and obtained, and the equivalent temperature can be obtained by applying an excitation signal, so that the realization is convenient.
In a possible implementation manner of the first aspect, the obtaining of the first association relationship includes: acquiring corresponding target impedance parameters and corresponding equivalent temperatures of the battery cells of the battery to be detected under a plurality of scenes; and determining the first association relation according to the target impedance parameters of the multiple battery cells and the equivalent temperature corresponding to the target capacitor.
By adopting the technical scheme, the first association relationship between the impedance parameter of the battery core of the battery to be detected and the equivalent temperature can be constructed by acquiring the target capacitance of the battery to be detected in a plurality of scenes and the equivalent temperature corresponding to the target impedance.
In a possible implementation manner of the first aspect, the obtaining of the second association relationship includes: acquiring the equivalent temperature, the internal temperature and the surface temperature of the battery core of the battery to be detected, which correspond to the battery core under a plurality of scenes; and determining the second association relation according to the surface temperatures and the equivalent temperatures corresponding to the surface temperatures and the internal temperatures.
By adopting the technical scheme, the second association relationship among the equivalent temperature, the internal temperature and the surface temperature of the battery cell of the battery to be detected can be constructed by acquiring the equivalent temperature, the internal temperature and the surface temperature of the battery to be detected in a plurality of scenes.
In one possible implementation manner of the first aspect, the value of the state of charge of the battery to be detected is between 50% and 100%.
By adopting the technical scheme, when the charge state of the battery to be detected is in the range of 50% -100%, the accuracy of capacitance measurement of the battery cell of the battery to be detected can be improved, so that the accuracy of equivalent temperature measurement is improved.
In a possible implementation manner of the first aspect, the frequency of the excitation signal is 400hz to 1000hz.
By adopting the technical scheme, when the frequency of the excitation signal of the battery to be detected is 400 Hz-1000 Hz, the accuracy of capacitance measurement of the battery cell of the battery to be detected can be improved, so that the accuracy of equivalent temperature measurement is improved.
In a possible implementation manner of the first aspect, the applying an excitation signal to a cell of a battery to be detected to obtain a current impedance parameter of the cell includes: applying an excitation signal to a battery core of a battery to be detected, and measuring to obtain a feedback signal, wherein if the excitation signal is an alternating voltage, the feedback signal is an alternating current; if the excitation signal is alternating current, the feedback signal is alternating voltage; acquiring a phase difference between the excitation signal and the feedback signal; and determining the current capacitance of the battery cell according to the excitation signal, the feedback signal and the phase difference.
By adopting the technical scheme, the measurement of the capacitance of the battery cell is realized by measuring the alternating current and the alternating voltage of the battery cell of the battery to be detected and the phase difference between the alternating current and the alternating voltage, so that the measurement is convenient to realize.
In a possible implementation manner of the first aspect, the method further includes: and correcting the temperature of the battery to be detected according to the equivalent temperature.
By adopting the technical scheme, the equivalent temperature is compared with the surface temperature of the battery cell of the battery to be detected, so that the true battery cell temperature of the battery to be detected can be more accurately represented, and the accuracy of temperature correction can be improved by correcting the battery temperature of the battery to be detected through the equivalent temperature.
In a second aspect, there is provided a battery temperature measuring apparatus comprising:
the capacitance measuring unit is used for applying an excitation signal to a battery cell of a battery to be detected to obtain the current impedance parameter of the battery cell, wherein the excitation signal is alternating current or alternating voltage, and the impedance parameter comprises at least one of impedance, resistance and capacitance of the battery cell;
and the temperature measurement unit is used for determining the equivalent temperature of the battery cell according to the current capacitance and a preset first association relation, wherein the first association relation describes the corresponding relation between the capacitance of the battery cell of the battery to be detected and the equivalent temperature of the battery cell.
In a third aspect, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the battery temperature measurement method as in any of the alternative implementations of the first aspect when the computer program is executed.
In a fourth aspect, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the battery temperature measurement method according to any one of the first aspects.
In a fifth aspect, the application provides a computer program product for, when run on an electronic device, causing the electronic device to perform the method of any one of the first aspects.
It will be appreciated that the advantages of the second to fifth aspects may be found in the relevant description of the first aspect, and are not described here again.
Drawings
Fig. 1 is a schematic flow chart of a battery temperature measurement method according to an embodiment of the present application;
fig. 2 is a schematic diagram of a measurement result of capacitance of a battery to be detected under different aging times according to an embodiment of the present application;
fig. 3 is a schematic diagram of a measurement result of capacitance of a battery to be detected under different states of charge according to an embodiment of the present application;
fig. 4 is a schematic diagram of a measurement result of capacitance of a battery to be detected at different test temperatures according to an embodiment of the present application;
fig. 5 is a flowchart of another battery temperature measurement method according to an embodiment of the present application;
Fig. 6 is a flowchart of another battery temperature measurement method according to an embodiment of the present application;
fig. 7 is a flowchart of another battery temperature measurement method according to an embodiment of the present application;
fig. 8 is a flowchart of another battery temperature measurement method according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a battery temperature measurement device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
It is to be understood that the terminology used in the embodiments of the application is for the purpose of describing particular embodiments of the application only, and is not intended to be limiting of the application. In the description of the embodiments of the present application, unless otherwise indicated, "a plurality" means two or more, and "at least one", "one or more" means one, two or more. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
For a better understanding of the embodiments of the present application, the states of charge that occur in the embodiments of the present application are specifically explained herein in turn.
1. State of Charge (SOC)
SOC is the ratio of the remaining capacity of the battery to the rated capacity. SOC is one of the important parameters of the battery management system (Battery Management System, BMS), and is also the basis for the charge-discharge control strategy and the battery balancing operation of the whole electric vehicle. However, due to the complexity of the structure of the battery, the SOC cannot be obtained by direct measurement, and the SOC estimation operation can be completed only by using a relevant calculation method according to certain external characteristics of the battery, such as the internal resistance, current and other relevant parameters of the battery.
The battery can produce heat in the power supply process of an electric device (such as an electric automobile), heat can not be timely diffused outside the battery due to the structure of the battery, heat can be accumulated inside the battery, and the internal actual temperature of the battery core of the battery is far higher than the outer surface temperature of the battery core of the battery, namely, the actual temperature of the battery core can not be accurately represented through the surface temperature of the battery core.
Based on the above problems, the embodiment of the application provides a battery temperature measurement method, which is characterized in that an excitation signal is applied to a battery core of a battery to be detected to determine the current impedance parameter of the battery core, and the equivalent temperature of the battery core is determined according to the association relation between the impedance parameter and the equivalent temperature of the battery core, wherein the impedance parameter can be at least one of the impedance, the resistance and the capacitance of the battery core of the battery to be detected.
The battery temperature measurement method disclosed by the embodiment of the application can be applied to an electric device using a battery as a power supply or various energy storage systems using the battery as an energy storage element. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.
The battery temperature measuring method disclosed by the embodiment of the application can be used for measuring the temperature of a cylindrical battery, a square battery or batteries with other shapes.
Referring to fig. 1, fig. 1 is a flowchart of a battery temperature measurement method according to an embodiment of the application, where the battery temperature measurement method includes the following steps:
s101, applying an excitation signal to a battery cell of the battery to be detected to obtain the current impedance parameter of the battery cell, wherein the excitation signal is alternating current or alternating voltage, and the impedance parameter comprises at least one of impedance, resistance and capacitance of the battery cell of the battery to be detected.
Optionally, if the impedance parameter includes impedance, an electrochemical reaction is generated in the cell by applying an excitation signal to the cell of the battery to be detected, and the current impedance of the capacitor can be determined according to ohm's law by measuring a relevant parameter of the cell of the battery, for example, if the excitation signal is an ac current, then measuring an ac voltage of the cell; if the excitation signal is an alternating voltage, measuring alternating current of the battery cell, and determining the current impedance of the battery cell according to ohm law.
Optionally, if the impedance parameter includes a capacitance, an electrochemical reaction is generated in the battery cell by applying an excitation signal to the battery cell of the battery to be detected, and by measuring a relevant parameter of the battery cell of the battery, for example, if the excitation signal is an ac current, measuring parameters such as an ac voltage of the battery cell, a phase difference between the ac current and the ac voltage, and the like, and then determining a current capacitance of the battery cell according to the measured relevant parameter; if the excitation signal is an ac voltage, parameters such as an ac current of the battery cell, a phase difference between the ac current and the ac voltage, etc. are measured, and the current capacitance of the battery cell is determined according to the measured related parameters.
Optionally, if the impedance parameter includes a resistor, an electrochemical reaction is generated in the cell by applying an excitation signal to the cell of the battery to be detected, and by measuring a relevant parameter of the cell of the battery, for example, if the excitation signal is an ac current, measuring parameters such as an ac voltage of the cell, a phase difference between the ac current and the ac voltage, and the like, and then determining a current resistor of the cell according to the measured relevant parameter; if the excitation signal is an ac voltage, parameters such as an ac current of the battery cell, a phase difference between the ac current and the ac voltage, etc. are measured, and the current resistance of the battery cell is determined according to the measured related parameters.
Optionally, the excitation signal may be a signal applied to the battery to be detected by an external device, and may enable electrochemical change to occur in the battery cell of the battery to be detected.
S102, determining the equivalent temperature of the battery cell of the battery to be detected according to the current impedance parameter of the battery cell and the first association relation.
The first association relation describes the relation between the impedance parameter of the battery cell of the battery to be detected and the equivalent temperature of the battery cell. If the impedance parameter comprises the impedance of the battery cell of the battery to be detected, the first association relation describes the relation between the impedance of the battery to be detected and the equivalent temperature of the battery cell; if the impedance parameter comprises the resistance of the battery cell of the battery to be detected, the first association relation describes the relation between the resistance of the battery cell of the battery to be detected and the equivalent temperature of the battery cell; if the impedance parameter includes the capacitance of the battery cell of the battery to be detected, the first association describes a relationship between the capacitance of the battery cell of the battery to be detected and the equivalent temperature of the battery cell, and if the impedance parameter includes two or three of the impedance, the resistance, and the capacitance of the battery cell of the battery to be detected, the first association describes a relationship between two or three impedance parameters and the equivalent temperature, for example, the impedance parameter includes the impedance and the resistance of the battery cell of the battery to be detected, the first association describes a relationship between the impedance of the battery to be detected and the equivalent temperature of the battery cell, and further describes a relationship between the resistance of the battery cell of the battery to be detected and the equivalent temperature of the battery cell.
Optionally, if the impedance parameter includes any one of impedance, resistance and capacitance of the battery cell of the battery to be detected, after the current impedance parameter of the battery cell is obtained, determining an equivalent temperature of the battery cell corresponding to the current impedance parameter by searching the current impedance parameter in the first association relation.
Optionally, if the impedance parameter includes at least two of impedance, resistance and capacitance of the battery cell of the battery to be detected, after obtaining at least two current impedance parameters of the battery cell, determining an equivalent temperature of the battery cell corresponding to each impedance parameter by searching each impedance parameter in the first association relationship, and determining a final equivalent temperature according to a preset rule, where the final equivalent temperature may be an average value of equivalent temperatures corresponding to the at least two impedance parameters.
According to the battery temperature measurement method, the current impedance parameter of the battery is obtained by applying the excitation signal to the battery core of the battery to be detected, the equivalent temperature of the battery core of the battery to be detected can be determined according to the relation between the impedance parameter and the equivalent temperature of the battery core, the test time of the current impedance parameter in the process is short, the test can be completed within 1s, and the normal use of the battery is not affected. According to the battery temperature measurement method, the equivalent temperature of the battery core of the battery is measured according to the relation between the impedance parameter and the equivalent temperature of the battery core, so that the battery temperature measurement method is convenient to realize, the equivalent temperature of the battery core can be measured without a sensor, and the cost is saved. In some alternative implementations, the equivalent temperature is an average temperature of an internal temperature of the cells of the battery. Compared with the temperature of the outer surface of the battery core of the battery, the equivalent temperature can more accurately represent the actual temperature of the battery core of the battery, so that the measurement accuracy of the battery can be improved.
In some possible implementation manners, the first association relation describes a relation between an impedance parameter of the battery to be detected and an equivalent temperature of the battery cell, and the current impedance parameter of the battery cells of the plurality of groups of battery cells to be detected and the equivalent temperature of the battery cells corresponding to the current impedance parameter are obtained by placing the battery to be detected in a preset environment and adjusting the temperature of the battery to be detected by changing the ambient temperature or the running state of the battery, and then the first association relation is constructed according to the impedance parameter of the plurality of groups of battery cells and the equivalent temperature corresponding to the impedance parameter, where the impedance parameter can be at least one of the impedance, the resistance and the capacitance of the battery cells of the battery to be detected.
Taking impedance parameters as an example of impedance of a battery core of the battery to be detected, placing the battery to be detected in a high-low temperature box at-20 ℃, and standing for 1 to 5 hours to enable the temperature of the battery to be the same as the ambient temperature, namely the equivalent temperature of the battery core is the same as the ambient temperature at the moment; then applying alternating current information to the battery core of the battery, measuring to obtain alternating current voltage at two ends of the battery core, and obtaining impedance of the battery core according to the alternating current voltage and the alternating current; then raising the temperature of the high-low temperature box by 5 ℃, standing for 1 to 5 hours so that the temperature of the battery is the same as the ambient temperature, namely the equivalent temperature of the battery cell is the same as the ambient temperature, and then measuring the target impedance of the battery cell of the battery to be detected according to the method; and sequentially circulating until the temperature of the high-low temperature box is raised to 40 ℃ to obtain target impedance corresponding to the equivalent temperatures of the batteries to be detected, and then determining and constructing a first association relation according to the target impedance of the battery cells of the batteries to be detected and the corresponding equivalent temperatures.
Optionally, the impedance parameters corresponding to at least three equivalent temperatures are substituted into the unitary quadratic equation to obtain the first association relationship in the form of the quadratic equation, and it can be appreciated that in other embodiments, other polynomials, such as a cubic equation and a fourth equation, may be established through a plurality of equivalent temperatures and a corresponding plurality of impedance parameters.
Referring to fig. 2, fig. 2 is a schematic diagram of measurement results of capacitance of a battery to be detected under different aging times, wherein an abscissa in fig. 2 is a frequency of an excitation signal, an ordinate is a capacitance of a battery cell of the battery to be detected, fig. 2 is a schematic diagram of measurement results of capacitance of five aging times, and the five aging times of the battery to be detected are respectively: as can be seen from fig. 2, the capacitance of the battery cell is less sensitive to the aging state of the battery, i.e., the aging time of the battery has less influence on the measurement result of the capacitance of the battery cell. Because the sensitivity degree of the capacitor of the battery core to the aging state of the battery is lower, namely the influence of the aging time of the battery on the measurement result of the capacitor of the battery core is smaller, the measurement of the equivalent temperature of the battery core is realized through the corresponding relation between the capacitor and the temperature, the interference of the aging state of the battery to the capacitor result can be ignored, and the accuracy of temperature measurement is further improved.
Referring to fig. 3, fig. 3 is a schematic diagram of measurement results of capacitance of a battery to be detected under different states of charge according to an embodiment of the present application, wherein an abscissa in fig. 3 is a frequency of an excitation signal, an ordinate is a capacitance of a battery cell of the battery to be detected, fig. 3 is a schematic diagram of measurement results of capacitance under seven states of charge (SOC), and the seven states of charge of the battery to be detected are respectively: as can be seen from fig. 3, when the SOC of the battery to be detected is 50%, 70%, 90%, and 100%, the excitation signals with the same frequency are applied, the measured capacitances of the battery cells are almost the same (the solid lines corresponding to the SOC of the battery in fig. 3 are almost coincident), and compared with the SOC of the battery to be detected at 0%, 10%, and 30%, the measurement result of the capacitance to be detected is more stable and accurate.
Therefore, in the process of obtaining the current capacitance of the battery cell by applying the excitation signal to the battery cell of the battery to be detected, if the value of the state of charge S0C of the battery to be detected is between 50% and 100%, the measurement result of the capacitance is more accurate, so that the equivalent temperature of the battery cell of the battery to be detected is determined according to the current capacitance and the first association relationship, and the accuracy of the equivalent temperature of the battery cell of the battery to be detected can be improved.
Referring to fig. 4, fig. 4 is a schematic diagram of a measurement result of a capacitance of a battery to be detected at different test temperatures, in which an abscissa in fig. 4 is a frequency of an excitation signal, an ordinate is a capacitance of a battery cell of the battery to be detected, and fig. 4 is a schematic diagram of a measurement result of a capacitance of a battery to be detected at six test temperatures, that is, the battery to be detected is placed in different test environments, and an excitation signal is applied to the battery cell of the battery to be detected at the six different test temperatures, so as to measure the capacitance of the battery cell of the battery to be detected, and as can be known from fig. 4, the capacitance of the battery cell of the battery to be detected is different at the different test temperatures, so that the equivalent temperature of the battery cell of the battery to be detected can be determined by obtaining the capacitance of the battery cell of the battery to be detected and according to the capacitance.
In fig. 2 to 4, when the frequency of the excitation signal is 400hz to 1000hz, the relationship between the equivalent temperature of the battery core of the battery to be detected and the capacitance is clearer and more stable, and the frequency of the excitation signal is set to 400hz to 1000hz so as to improve the accuracy of the measurement result of the temperature to be detected.
In some possible implementations, an ac current or an ac voltage is applied to the battery cell of the battery to be detected, and then the current capacitance of the battery cell of the battery to be detected is determined according to the ac voltage, and the phase difference between the ac voltage and the ac voltage, please refer to fig. 5, fig. 5 is a flow chart of another battery measurement method provided in an embodiment of the present application, then S101 includes:
S501, applying an excitation signal to a battery cell of the battery to be detected, and measuring to obtain a feedback signal.
If the excitation signal is an alternating voltage, the feedback signal obtained by measuring the battery cell is an alternating current; if the excitation signal is an alternating current, the feedback signal obtained by measuring the cell is an alternating voltage.
S502, obtaining a phase difference between the excitation signal and the feedback signal.
The phase difference is the difference between two phases of physical quantities which change periodically, after an excitation signal is applied to the battery core of the battery to be detected, electrochemical reaction can be generated in the battery core, so that the obtained phase difference between the alternating voltage and the alternating current is generated, and the phase difference between the alternating voltage and the alternating current corresponding to the battery core can be obtained in a measuring mode.
S503, determining the current capacitance of the battery cell according to the excitation signal, the feedback signal and the phase difference.
Specifically, after ac voltage and ac current are obtained, the impedance of the battery cell can be calculated according to ohm's law, and then the current capacitance is determined according to the impedance and the phase difference, specifically as follows:
v=iz (formula one);
(equation II)；
(equation three);
wherein V is an alternating voltage, I is an alternating current, Z is an impedance, Z 'is a real part of the impedance, Z' is an imaginary part of the impedance, and θ is a phase difference between the alternating voltage and the alternating current.
After the ac voltage and the ac current are obtained, the ac voltage and the ac current are substituted into the formula one (i.e., ohm theorem) to determine the impedance of the battery cell (i.e., formula two), and then the formula three can be determined based on the phase difference θ and the formula two (wherein, for the battery cell, the imaginary part of the impedance is the current capacitance of the battery cell).
After the excitation signal is applied to the battery cell of the battery to be detected, the phase difference among the feedback signal, the excitation signal and the feedback signal is obtained through measurement, then the current capacitance of the battery cell can be determined according to the excitation signal, the feedback signal and the phase difference, the capacitance can be determined through the ohm law and the relation between the impedance and the capacitance, the excitation signal, the feedback signal and the phase difference can be obtained through measurement, the obtained result is combined with the formula to achieve accurate determination of the current capacitance of the battery cell, and further the accuracy of measurement of the temperature of the battery to be detected is improved.
It can be understood that the current capacitance of the battery cells of the plurality of groups of battery cells to be detected and the equivalent temperature of the battery cells corresponding to the current capacitance can be obtained by placing the battery cells to be detected in a preset environment and adjusting the temperature of the battery cells to be detected by changing the ambient temperature or the running state of the battery cells, and then the first association relationship is constructed according to the capacitances of the plurality of groups of battery cells and the equivalent temperature corresponding to the capacitances.
Referring to fig. 6, fig. 6 is a flowchart of another battery temperature measurement method according to an embodiment of the present application, in a process of determining an equivalent temperature of a battery cell according to a relationship between a capacitance and a temperature of the battery cell to be detected, the obtaining of a first association relationship includes:
s601, acquiring target capacitances and corresponding equivalent temperatures of battery cells of the battery to be detected in a plurality of scenes.
Specifically, the battery to be detected is sequentially placed in a plurality of scenes, and under each scene, the battery cell of the battery to be detected has a corresponding equivalent temperature, for example, the battery is placed in a preset environment for a time long enough to make the environment temperature equal to the battery temperature, and then the equivalent temperature of the battery cell is the environment temperature; and applying an excitation signal to the scene to obtain the target capacitance of the scene, so that the equivalent temperature of the battery cells of the battery to be detected and the current target capacitance of the plurality of scenes can be obtained.
Illustratively, the battery to be detected is placed in a high-low temperature box at-20 ℃ and is kept stand for 1 to 5 hours, so that the temperature of the battery is the same as the ambient temperature, namely the equivalent temperature of the battery cell is the same as the ambient temperature at the moment; then applying alternating current information to the battery core of the battery, measuring to obtain alternating current voltage at two ends of the battery core and phase difference between the alternating current voltage and the alternating current, obtaining impedance of the battery core according to the alternating current voltage and the alternating current, and obtaining target capacitance of the battery core according to the impedance and the phase difference; then raising the temperature of the high-low temperature box by 5 ℃, standing for 1 to 5 hours so that the temperature of the battery is the same as the ambient temperature, namely the equivalent temperature of the battery cell is the same as the ambient temperature, and then measuring the target capacitance of the battery cell of the battery to be detected according to the method; and sequentially circulating until the temperature of the high-low temperature box is raised to 40 ℃ to obtain target capacitances corresponding to equivalent temperatures of a plurality of batteries to be detected.
S602, determining a first association relation according to target capacitances of the battery cells and equivalent temperatures corresponding to the target capacitances.
Specifically, according to the obtained target capacitances of the plurality of battery cells and equivalent temperatures corresponding to the target capacitances, a corresponding relationship between the equivalent temperatures and the capacitances of the battery cells of the battery to be detected is constructed.
Therefore, the battery to be detected is placed in different scenes to obtain a plurality of equivalent temperatures of the battery to be detected and target capacitances corresponding to the equivalent temperatures, the relationship between the capacitance of the battery core and the equivalent temperatures is established according to the equivalent temperatures and the corresponding target capacitances, and the first association relationship is determined under various scenes to improve the applicability of the first association relationship and further improve the accuracy of the internal temperature determined based on the first association relationship.
In an alternative implementation, at least three equivalent temperatures are usedThe corresponding capacitance Z' is substituted into the unitary quadratic equation to obtain a first association relationship as follows:
；
wherein a, b, c are coefficients of the first association relationship, a is a constant term, b is the number of times of the primary term, and c is a coefficient of the secondary term.
It will be appreciated that in other embodiments, other polynomials, such as a third equation, a fourth equation, may also be established with a plurality of equivalent temperatures and a corresponding plurality of target capacitances.
Of course, a deep learning model can be established according to a plurality of equivalent temperatures and a plurality of corresponding target capacitances, the deep learning model is used for predicting the equivalent temperature of the battery cell, namely, the current capacitance of the battery cell is input into the deep learning model, and the output result of the deep learning model is the internal temperature of the battery cell.
It can be understood that the battery can generate heat in the use process, the actual temperatures of different positions in the battery are different, the equivalent temperature of the battery can represent the average temperature in the battery, but cannot accurately represent the highest temperature in the battery cell of the battery to be detected, and the application is based on the detection. Referring to fig. 7, fig. 7 is a flowchart of another battery temperature measurement method according to an embodiment of the present application, after obtaining an equivalent temperature of a battery cell of a battery to be detected, the method further includes:
s701, acquiring the surface temperature of the battery cell of the battery to be detected.
Optionally, a temperature sensor is disposed on the outer surface of the battery core of the battery to be detected to measure the surface temperature of the battery core, where the surface temperature of the battery core is the surface temperature of the battery core.
S702, determining the internal temperature of the battery cell according to the surface temperature, the equivalent temperature and a preset second association relation.
Wherein the second association describes correspondence of the surface temperature, the equivalent temperature, and the internal temperature.
Optionally, the internal temperature of the cell is the highest temperature of the interior of the cell.
Therefore, after the surface temperature and the equivalent temperature of the battery core are obtained, the internal temperature of the battery core of the battery to be detected can be determined according to the relationship among the surface temperature, the equivalent temperature and the internal temperature of the battery core of the battery to be detected. The surface temperature and the equivalent temperature are used for determining the internal temperature of the battery to be detected, wherein the internal temperature is the maximum temperature of the inside of the battery cell of the battery to be detected, and the actual temperature of the battery cell can be more accurately represented.
It can be understood that the equivalent temperature, the surface temperature and the internal temperature of the battery cells of a plurality of groups of battery cells to be detected can be obtained by placing the battery to be detected in a preset environment and adjusting the temperature of the battery to be detected by changing the ambient temperature or the running state of the battery, and then the second association relationship is constructed according to the plurality of groups of equivalent temperature, the surface temperature and the internal temperature.
Referring to fig. 8, fig. 8 is a flowchart of another battery temperature measurement method according to an embodiment of the present application, in a process of determining an internal temperature according to a correspondence between a surface temperature, an equivalent temperature, and the internal temperature, the obtaining of a second association relationship includes:
S801, obtaining equivalent temperatures, internal temperatures and surface temperatures of battery cells of the battery to be detected under a plurality of scenes.
Optionally, placing the battery to be detected in a plurality of scenes in sequence, under each scene, measuring the surface temperature and the internal temperature of the battery cell of the battery to be detected by arranging a sensor, obtaining the current capacitance of the battery cell by applying an excitation signal to the battery cell of the battery to be detected, and determining the equivalent temperature of the battery to be detected according to the current capacitance and the first association relation; therefore, the equivalent temperature, the surface temperature and the internal temperature of the battery core of the battery to be detected in a plurality of scenes can be obtained.
The method comprises the steps of placing a battery to be detected in a first working state, measuring the surface temperature and the internal temperature of a battery core of the battery to be detected through a sensor, and then applying an excitation signal to the battery to be detected so as to reach the current capacitance of the battery core, wherein the equivalent temperature of the battery to be detected can be determined according to the current capacitance and a first association relation; then placing the battery to be detected in a second working state, measuring the surface temperature and the internal temperature of the battery core of the battery to be detected through a sensor, and then applying an excitation signal to the battery to be detected so as to reach the current capacitance of the battery core, and determining the equivalent temperature of the battery to be detected according to the current capacitance and the first association relation; and then sequentially circulating to obtain the equivalent temperature, the internal temperature and the surface temperature of the battery core of the battery to be detected in a plurality of working states.
S802, determining a second association relation according to the surface temperatures and the equivalent temperatures corresponding to the surface temperatures and the internal temperatures.
Specifically, the corresponding relation among the equivalent temperature, the internal temperature and the surface temperature of the battery cell to be detected is constructed according to the obtained equivalent temperatures and the internal temperatures of the plurality of surface temperatures of the battery cell.
Therefore, the battery to be detected is placed in different working scenes to obtain a plurality of surface temperatures of the battery to be detected, the internal temperature corresponding to the surface temperatures and the equivalent temperature, and the relation among the surface temperature, the internal temperature and the equivalent temperature of the battery core is built according to the surface temperatures and the internal temperature corresponding to the surface temperatures and the equivalent temperature. And determining the second association relation under various scenes to improve the applicability of the second association relation and further improve the accuracy of the temperature of the interior determined based on the second association relation.
In an alternative implementation manner, the surface temperatures, the internal temperatures corresponding to the surface temperatures, and the equivalent temperatures are substituted into the unitary first-order equation to obtain the second association relationship as follows:
；
wherein a and b are coefficients of the second association relationship, and a and b are times of a term.
It is understood that in other embodiments, other polynomials, such as cubic equations, and fourth-order equations, may be established with a plurality of surface temperatures, and the internal temperatures corresponding to the surface temperatures, and the equivalent temperatures.
Of course, a deep learning model can be established according to a plurality of surface temperatures and internal temperatures and equivalent temperatures corresponding to the surface temperatures, and the deep learning model is used for predicting the internal temperature of the battery cell, namely, the equivalent temperature and the surface of the battery cell are input into the deep learning model, and the output result of the deep learning model is the internal temperature of the battery cell.
Referring to table 1, table 1 is a temperature measurement result of a cylindrical battery provided in the embodiment of the present application, and it is known from table 1 that when the temperature of the cylindrical battery to be detected is measured at two charge/discharge rates, and the charge/discharge rate is 0.5C, an error between the internal temperature (28.9 ℃) calculated based on the internal temperature measurement method in the above embodiment (e.g., the measurement method shown in fig. 8) and the actually measured internal temperature (29.2 ℃) of the battery cell of the battery to be detected is 0.3 ℃; when the charge-discharge rate is 1℃, the error between the internal temperature (30.0 ℃) calculated based on the internal temperature measurement method in the above embodiment and the actually measured internal temperature (32.1 ℃) of the battery cell of the battery to be detected is 0.1 ℃, and as can be seen from table 1, the internal temperature of the battery measured by the battery temperature measurement method provided by the application is better in accuracy and smaller in error.
The actually measured internal temperature of the battery cell of the battery to be detected can be measured by arranging a sensor inside the battery cell of the battery to be detected.
TABLE 1 Cylinder Battery temperature and measured temperature
In some embodiments, after obtaining the equivalent temperature and the internal temperature of the battery cell of the battery to be detected, the method is further used for controlling the temperature of the battery to be detected according to the equivalent temperature and the internal temperature (for example, adjusting the temperature of the battery through an energy storage fire protection system and/or a thermal management system of the battery) so that the output power of the battery to be detected is not affected by the temperature. The method further comprises: and correcting the temperature of the battery to be detected according to the equivalent temperature. The temperature of the battery to be detected in the battery management system can be corrected according to the equivalent temperature. Compared with the surface temperature of the battery core of the battery, the equivalent temperature of the battery core of the battery can more accurately represent the temperature of the battery, the temperature of the battery to be detected is corrected through the equivalent temperature, and the accuracy of the corrected temperature is improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
In an alternative implementation manner, an excitation signal is applied to a battery cell of a battery to be detected, wherein the value of the state of charge of the battery to be detected is 50% -100%, the excitation signal is a current signal or a voltage signal, the frequency of the current signal or the voltage signal is 400 Hz-1000 Hz, and if the excitation signal is the current signal, the voltage signal of the battery cell and the phase difference between the current signal and the voltage signal are measured; if the excitation signal is a voltage signal, measuring a current signal of the battery cell and a phase difference between the current signal and the voltage signal, determining a current capacitance of the battery to be detected according to the current signal, the voltage signal and the phase difference, and determining an equivalent temperature of the battery cell of the battery to be detected according to a first association relation of the capacitance and the equivalent temperature of the battery cell.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a battery temperature measuring device. The battery temperature measuring device provided by the embodiment of the application can realize the processes of the embodiment of the battery temperature measuring method and achieve the same technical effects, so the specific limitation of one or more embodiments of the battery temperature measuring device provided below can be referred to the limitation of the graphics rendering method hereinabove, and the description thereof is omitted for avoiding repetition.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a battery temperature measuring device according to an embodiment of the present application.
The battery temperature measuring device 90 includes a capacitance measuring unit 91 and a temperature measuring unit 92, wherein:
the capacitance measurement unit 91 is configured to apply an excitation signal to a cell of a battery to be detected, so as to obtain a current impedance parameter of the cell, where the excitation signal is an ac current or an ac voltage;
the temperature measurement unit 92 is configured to determine an equivalent temperature of the battery cell according to a preset first association relationship between the current impedance parameter and the preset first association relationship, where the first association relationship describes a correspondence between the impedance parameter of the battery cell to be detected and the equivalent temperature of the battery cell.
In one possible implementation, the temperature measurement unit 92 is further configured to: and determining the equivalent temperature of the battery cell according to the current capacitance and a preset first association relation, wherein the first association relation describes the corresponding relation between the capacitance in the impedance of the battery cell of the battery to be detected and the equivalent temperature of the battery cell.
In one possible implementation, the temperature measurement unit 92 is further configured to: acquiring the surface temperature of the battery core of the battery to be detected; and determining the internal temperature of the battery cell according to the surface temperature, the equivalent temperature and a preset second association relation, wherein the second association relation describes the corresponding relation between the surface temperature, the equivalent temperature and the internal temperature.
In one possible implementation, the temperature measurement unit 92 is further configured to: acquiring corresponding target impedance parameters of the battery cell of the battery to be detected in a plurality of scenes, wherein the battery cell of the battery to be detected has corresponding equivalent temperature in each scene; and determining the first association relation according to the target impedance parameters of the multiple battery cells and the equivalent temperatures corresponding to the target impedance parameters.
In one possible implementation, the temperature measurement unit 92 is further configured to: acquiring the equivalent temperature, the internal temperature and the surface temperature of the battery core of the battery to be detected, which correspond to the battery core under a plurality of scenes; and determining the second association relation according to the surface temperatures and the equivalent temperatures corresponding to the surface temperatures and the internal temperatures.
In one possible implementation manner, the state of charge of the battery to be detected is 50% -100%.
In one possible implementation manner, the frequency of the excitation signal is 400hz to 1000hz.
In one possible implementation, the temperature measurement unit 92 is further configured to: applying an excitation signal to a battery core of a battery to be detected, and measuring to obtain a feedback signal, wherein if the excitation signal is an alternating voltage, the feedback signal is an alternating current; if the excitation signal is alternating current, the feedback signal is alternating voltage; acquiring a phase difference between the excitation signal and the feedback signal; and determining the current capacitance of the battery cell according to the excitation signal, the feedback signal and the phase difference.
Fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in the figure, the electronic device 100 provided in this embodiment may include: a processor 1040, a memory 1041, and a computer program 1042 stored in the memory 1041 and executable on the processor 1040, such as a program corresponding to a battery temperature measuring method. The steps described above as being applied to embodiments of the battery temperature measurement method, such as those shown in fig. 1, 5, 6, 7, or 8, are implemented when the processor 1040 executes the computer program 1042.
By way of example, computer program 1042 may be partitioned into one or more modules/units, which are stored in memory 1041 and executed by processor 1040 to implement the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing particular functions to describe the execution of the computer program 1042 in the electronic device 100.
It will be appreciated by those skilled in the art that fig. 10 is merely an example of the electronic device 100 and is not limiting of the electronic device 100 and may include more or fewer components than shown, or may combine certain components, or different components.
The processor 1040 may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 1041 may be an internal storage unit of the electronic device 100, such as a hard disk or a memory of the electronic device 100. The memory 1041 may also be an external storage device of the electronic device 100, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card (flash card), or the like, which are provided on the electronic device. Further, the memory 1041 may also include both internal storage units and external storage devices of the electronic device 100.
The memory 1041 is used to store computer programs and other programs and data required by the electronic device. The memory 1041 may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units is illustrated, and in practical application, the above-mentioned functional allocation may be performed by different functional units according to needs, i.e. the internal structure of the power supply control device is divided into different functional units, so as to perform all or part of the functions described above. The functional units in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present application. The specific working process of the units in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, which when executed by a processor, performs the steps of the respective method embodiments described above.
Embodiments of the present application provide a computer program product for causing an electronic device to carry out the steps of the method embodiments described above when the computer program product is run on the electronic device.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference may be made to related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Finally, it should be noted that: the foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A method of measuring battery temperature, the method comprising:
applying an excitation signal to a battery cell of a battery to be detected to obtain a current impedance parameter of the battery cell, wherein the excitation signal is alternating current or alternating voltage, and the impedance parameter comprises at least one of impedance, resistance and capacitance of the battery cell;
And determining the equivalent temperature of the battery cell according to the current impedance parameter and a preset first association relation, wherein the first association relation describes the corresponding relation between the impedance parameter of the battery cell of the battery to be detected and the equivalent temperature of the battery cell.
2. The method according to claim 1, wherein the method further comprises:
acquiring the surface temperature of the battery core of the battery to be detected;
and determining the internal temperature of the battery cell according to the surface temperature, the equivalent temperature and a preset second association relation, wherein the second association relation describes the corresponding relation between the surface temperature, the equivalent temperature and the internal temperature.
3. The method according to claim 1 or 2, wherein the obtaining of the first association relation comprises:
acquiring corresponding target impedance parameters and corresponding equivalent temperatures of the battery cells of the battery to be detected under a plurality of scenes;
and determining the first association relation according to the target impedance parameters of the multiple battery cells and the equivalent temperatures corresponding to the target impedance parameters.
4. The method of claim 2, wherein the obtaining of the second association relationship comprises:
Acquiring the equivalent temperature, the internal temperature and the surface temperature of the battery core of the battery to be detected, which correspond to the battery core under a plurality of scenes;
and determining the second association relation according to the surface temperatures, the equivalent temperatures corresponding to the surface temperatures and the internal temperatures.
5. The method according to claim 1, wherein if the impedance parameter is a current capacitance of the battery cell, the applying an excitation signal to the battery cell of the battery to be detected to obtain the current impedance parameter of the battery cell includes:
applying an excitation signal to a battery core of a battery to be detected, and measuring to obtain a feedback signal, wherein if the excitation signal is an alternating voltage, the feedback signal is an alternating current; if the excitation signal is alternating current, the feedback signal is alternating voltage;
acquiring a phase difference between the excitation signal and the feedback signal;
and determining the current capacitance of the battery cell according to the excitation signal, the feedback signal and the phase difference.
6. The method according to claim 1, wherein the value of the state of charge of the battery to be detected is between 50% and 100%.
7. The method of claim 1, wherein the excitation signal has a frequency of 400hz to 1000hz.
8. The method according to claim 1, wherein the method further comprises:
and correcting the temperature of the battery to be detected according to the equivalent temperature.
9. A battery temperature measurement device, characterized by comprising:
the capacitance measuring unit is used for applying an excitation signal to a battery cell of a battery to be detected to obtain the current impedance parameter of the battery cell, wherein the excitation signal is alternating current or alternating voltage, and the impedance parameter comprises at least one of impedance, resistance and capacitance of the battery cell;
and the temperature measurement unit is used for determining the equivalent temperature of the battery cell according to the current impedance parameter and a preset first association relation, wherein the first association relation describes the corresponding relation between the impedance parameter of the battery cell of the battery to be detected and the equivalent temperature of the battery cell.
10. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the battery temperature measurement method according to any one of claims 1 to 8 when the computer program is executed.
11. A computer-readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the battery temperature measurement method according to any one of claims 1 to 8.
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