Battery temperature measuring method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a battery temperature measuring method, electronic equipment and a storage medium. The battery temperature measuring method comprises the steps that the surface temperature and the environment temperature of a target battery are measured; determining a heat transfer relation parameter corresponding to the surface temperature and the internal temperature of the target battery; and determining the internal temperature of the target battery based on the surface temperature, the environment temperature and the heat transfer relation parameter. According to the battery temperature measurement scheme provided by the invention, the internal temperature of the battery can be quickly and accurately measured without depending on a complicated built-in temperature sensor, so that the battery test and research and development efficiency is improved, materials are reduced, and the battery manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery temperature measurement method, an electronic device, and a storage medium. Background Art

[0002] With the rapid development of new energy technologies, lithium-ion batteries have been increasingly widely used in electric vehicles and energy storage systems due to their advantages such as high energy density, high working voltage, long cycle life, and low self-discharge rate. However, during the actual operation of the battery, its temperature often rises due to various factors such as environmental temperature, heat dissipation conditions, and charge-discharge regimes. In particular, the highest temperature inside the battery is crucial for the performance and safety of the battery. Prolonged operation of the battery in a high-temperature environment will lead to a shortened lifespan and pose a risk of thermal runaway or even thermal safety accidents. Therefore, accurately measuring and controlling the battery temperature, especially the temperature inside the battery, is crucial for ensuring the performance and safety of the battery.

[0003] Currently, the measurement of the temperature inside the battery usually relies on a battery with a built-in temperature sensor (TC battery), and the internal temperature is directly measured by installing a temperature sensor inside the battery. However, the manufacturing process of TC batteries is complex, costly, and the yield rate is low, which not only increases the cost of battery manufacturing but also prolongs the cycle of battery research and development and testing. In addition, the built-in temperature sensor may affect the structure and performance of the battery, thereby affecting the actual application effect of the battery.

[0004] The foregoing description is provided to give general background information and does not necessarily constitute prior art. Summary of the Invention

[0005] Embodiments of the present application provide a battery temperature measurement method, an electronic device, and a storage medium, which can quickly and accurately measure the temperature inside the battery without relying on a complex built-in temperature sensor, thereby improving the efficiency of battery testing and research and development, reducing materials, and lowering the manufacturing cost of the battery.

[0006] Embodiments of the present application provide a battery temperature measurement method, including:

[0007] Measuring the surface temperature and the environmental temperature of the target battery;

[0008] Determining the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery;

[0009] Based on the surface temperature, the environmental temperature, and the heat transfer relationship parameters, determining the internal temperature of the target battery.

[0010] Optionally, in some embodiments of the present application, the measuring the surface temperature and the environmental temperature of the target battery includes:

[0011] Place the target battery in a bellows or oil bath environment;

[0012] Measure the temperature of the target battery and its environment through a temperature measuring device to obtain the surface temperature and ambient temperature of the target battery.

[0013] Optionally, in some embodiments of the present application, the determining the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery includes:

[0014] Obtain the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery through experimental testing;

[0015] Or, calculate the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery through theoretical calculation methods.

[0016] Optionally, in some embodiments of the present application, the obtaining the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery through experimental testing includes:

[0017] Fabricate a test battery with an in-built temperature sensor, where the performance parameters of the test battery are the same as those of the target battery;

[0018] Conduct a thermal test on the test battery to measure the sample temperature data of the test battery, where the sample temperature data includes the sample surface temperature and the sample internal temperature;

[0019] Perform fitting based on the sample temperature data to obtain the sample heat transfer relationship parameters between the sample surface temperature and the sample internal temperature of the test battery, and use the sample heat transfer relationship parameters as the heat transfer relationship parameters of the target battery.

[0020] Optionally, in some embodiments of the present application, the calculating the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery through theoretical calculation methods includes:

[0021] Obtain the structure type, material property parameters, and heat dissipation method of the target battery;

[0022] Based on the structure type, material property parameters, and heat dissipation method, calculate the thermal resistance parameters from the inside to the surface of the target battery;

[0023] Calculate the current convective heat transfer coefficient of the target battery;

[0024] Based on the thermal resistance parameters and the convective heat transfer coefficient, calculate the heat transfer relationship parameters between the internal temperature and the surface temperature of the battery.

[0025] Optionally, in some embodiments of the present application, calculating the current convective heat transfer coefficient of the target battery includes:

[0026] Performing back-calculation based on experimental measurement data by using the measured data back-calculation method to obtain the current convective heat transfer coefficient of the target battery;

[0027] Or, performing simulation calculation on the target battery and the cooling system by using the simulation method to obtain the current convective heat transfer coefficient of the target battery.

[0028] Optionally, in some embodiments of the present application, performing back-calculation based on experimental measurement data by using the measured data back-calculation method to obtain the current convective heat transfer coefficient of the target battery includes:

[0029] Testing the target battery in a preset environment to obtain test data;

[0030] Obtaining the battery surface temperature, coolant inlet temperature, and coolant outlet temperature in the test data;

[0031] Performing back-calculation based on the battery surface temperature, the coolant inlet temperature, and the coolant outlet temperature to obtain the current convective heat transfer coefficient of the target battery.

[0032] Optionally, in some embodiments of the present application, performing simulation calculation on the target battery and the cooling system by using the simulation method to obtain the current convective heat transfer coefficient of the target battery includes:

[0033] Constructing a three-dimensional model corresponding to the target battery and the cooling system;

[0034] Setting the initial temperature of the target battery, the coolant inlet temperature, and the coolant flow rate;

[0035] Controlling the three-dimensional model to perform simulation operation based on the initial temperature of the target battery, the coolant inlet temperature, and the coolant flow rate to obtain corresponding simulation results;

[0036] Analyzing and comparing the simulation results to determine the current convective heat transfer coefficient of the target battery.

[0037] Correspondingly, the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. Wherein, when the processor executes the program, it performs the steps of any one of the above battery temperature measurement methods.

[0038] The present application further provides a computer-readable storage medium. The storage medium stores a computer program, and when the computer program is executed by a processor, it implements the steps of any one of the above battery temperature measurement methods.

[0039] An embodiment of the present application provides a battery temperature measurement method, an electronic device, and a storage medium. First, the surface temperature and the ambient temperature of a target battery are measured; then, heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery are determined; finally, based on the surface temperature, the ambient temperature, and the heat transfer relationship parameters, the internal temperature of the target battery is determined. The battery temperature measurement solution provided by the present application accurately obtains the surface temperature and the ambient temperature of the battery, and calculates the internal temperature of the battery in combination with the heat transfer relationship parameters of the battery, so as to realize quickly and accurately measuring the internal temperature of the battery without relying on complex built-in temperature sensors, thereby improving the efficiency of battery testing and research and development, avoiding the high cost of manufacturing a large number of batteries with built-in temperature sensors, reducing material and manufacturing costs, and at the same time reducing the additional costs caused by the low yield rate of batteries with built-in temperature sensors, accelerating the time from research and development to market of battery products, and shortening the development cycle. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 is a schematic flowchart of the battery temperature measurement method provided by the embodiment of the present application;

[0042] Figure 2 is a schematic diagram of the derivation process of the internal temperature calculation formula provided by the embodiment of the present application;

[0043] Figure 3 is a schematic structural diagram of the electronic device provided by the embodiment of the present application. Detailed Embodiments

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0045] An embodiment of the present application provides a battery temperature measurement method, a device, an electronic device, and a storage medium.

[0046] Among them, the battery temperature measurement device can be specifically integrated into a terminal, which can include a tablet computer or a personal computer (PC). The terminal can establish a wired or wireless connection with a server. The server can include an independently operating server or a distributed server, or can also include a server cluster composed of multiple servers.

[0047] The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0048] A battery temperature measurement method includes: measuring the surface temperature and the ambient temperature of a target battery; determining a heat transfer relationship parameter corresponding to the surface temperature and the internal temperature of the target battery; and determining the internal temperature of the target battery based on the surface temperature, the ambient temperature, and the heat transfer relationship parameter.

[0049] Please refer to Figure 1 , Figure 1 which is a schematic flowchart of the battery temperature measurement method provided by the embodiment of the present application. The specific process of the battery temperature measurement method can be as follows:

[0050] 101. Measure the surface temperature and the ambient temperature of a target battery.

[0051] Specifically, for step 101, the target battery is mainly placed in a specific test environment, such as a wind box or an oil bath, to simulate actual working conditions, and the temperature of the target battery and its environment is measured through a relevant temperature measurement device, such as measuring the surface temperature and the ambient temperature of the target temperature.

[0052] Optionally, in some embodiments, step 101, "measuring the surface temperature and the ambient temperature of a target battery", can specifically include:

[0053] Place the target battery in a wind box or an oil bath environment;

[0054] Specifically, the target battery whose temperature needs to be measured is placed in a wind box or an oil bath environment to simulate different heat dissipation conditions and ambient temperatures. Among them, the wind box can provide controllable air flow, while the oil bath can provide uniform heat conduction. By controlling the wind speed or the flow rate of the oil, different heat dissipation conditions can be simulated, the convective heat dissipation of the battery surface can be realized, and the battery surface temperature under these conditions can be measured.

[0055] In addition, an automated wind box and oil bath system can be designed to achieve automated control, such as automatically adjusting the wind speed or the oil temperature to simulate different working conditions. An intelligent control system is introduced to automatically adjust the parameters of the wind box or the oil bath according to the real-time temperature feedback of the battery.

[0056] In this embodiment, by simulating the real working environment, the accuracy and reliability of the measurement results are ensured, and consistent and controllable test conditions are provided, which is convenient for comparing the performance of different batteries or different working states.

[0057] The temperature of the target battery and its surrounding environment is measured by a temperature measuring device to obtain the surface temperature and the ambient temperature of the target battery.

[0058] Specifically, a high-precision temperature sensor or an infrared detector is used to directly measure the temperature of the battery surface. For example, a temperature sensor can be installed on the surface of the battery, which can be a thermocouple, a thermistor or other types of temperature sensing devices. The sensor is placed at a specific position on the battery surface to ensure that the temperature changes of the battery under different working states can be accurately captured. At the same time, the temperature of the bellows or oil bath environment is measured to obtain the ambient temperature data, such as the coolant temperature. During different test stages such as battery charge and discharge, usage conditions or fast charge conditions, the temperature data of the battery surface are recorded for the subsequent determination of the characteristic parameter K and the estimation of the internal temperature of the battery. After collecting and recording the temperature data of the battery surface and the environment, the data are preliminarily processed, such as filtering and averaging, to improve the accuracy of the data.

[0059] In addition, a multi-point measurement system can be adopted to measure the temperature of different areas on the surface of the target battery to obtain more comprehensive temperature distribution data. Moreover, the collected data are deeply analyzed by using data analysis software to identify the trends and patterns of temperature changes, or combined with machine learning algorithms to predict and detect anomalies in the temperature data.

[0060] This embodiment provides an accurate measurement method for the surface temperature and the ambient temperature of the battery, obtains accurate data of the battery surface temperature, provides a basis for the subsequent internal temperature estimation, and the measurement of the ambient temperature helps to evaluate the influence of external conditions on the thermal behavior of the battery. Through data analysis, the thermal behavior of the battery can be analyzed more comprehensively, providing a basis for optimizing the design.

[0061] 102. Determine the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery.

[0062] Specifically, for step 102, mainly through experimental tests or theoretical calculations, the heat transfer relationship parameter K between the surface temperature and the internal temperature of the target battery is obtained.

[0063] Please refer to Figure 2 , Figure 2 which provides the inference process of the internal temperature of the battery by Fourier's law of heat conduction and Newton's cooling formula. The specific process is as follows:

[0064]

[0065] Among them, R Core-SurfaceFor the thermal resistance from the battery core to the surface, it represents the resistance to heat transfer from the battery core to the surface; R Surface-Coolant For the thermal resistance from the battery surface to the coolant, it represents the resistance to heat transfer from the battery surface to the coolant.

[0066] The above two formulas indicate that the heat flow q from the battery core to the surface (R Core-Surface ) and from the surface to the coolant (R Surface-Coolant ) is equal because the thermal resistance from the battery core to the surface and from the surface to the coolant are in series.

[0067] Through the equation:

[0068]

[0069] The relationship of the thermal resistance ratio can be derived:

[0070]

[0071] Define the heat transfer relationship parameter K as the ratio of the two thermal resistances:

[0072]

[0073] Using the characteristic parameter K, the battery core temperature can be calculated:

[0074] T Core = K * (T Surface - T Coolan t) + T Surface；

[0075] It can be seen that this calculation formula combines the battery surface temperature T Surface , the coolant temperature (ambient temperature) T Coolant and the heat transfer relationship parameter K to estimate the core temperature inside the battery. That is, the key to obtaining the internal temperature of the battery is to obtain the characteristic parameter K.

[0076] Optionally, in some embodiments, step 102 "determine the heat transfer relationship parameter corresponding to the surface temperature and internal temperature of the target battery" may specifically include:

[0077] Obtain the heat transfer relationship parameter corresponding to the surface temperature and internal temperature of the target battery through experimental testing;

[0078] Or, calculate the heat transfer relationship parameter corresponding to the surface temperature and internal temperature of the target battery through theoretical calculation methods.

[0079] Specifically, in this embodiment, two methods are provided to determine the heat transfer relationship parameter K. The first method is the actual measurement method. A test battery with the same performance parameters as the target battery is fabricated, and a temperature sensor is built-in to directly measure the internal temperature. Then, the test battery is subjected to a thermal test in a controlled environment, and the temperature data of the battery surface, the battery interior, and the coolant are collected. Thus, the value of K is obtained by fitting based on the temperature data of the battery surface, the battery interior, and the coolant obtained from the actual test. Since the coolant flow rate affects the thermal resistance between the battery surface and the cooling system, separate tests and fittings are required at different flow rates.

[0080] The other method is the theoretical method. Based on the structural type, material characteristic parameters, and heat dissipation method of the target battery, the thermal resistance parameters are calculated using the heat conduction theory and formulas, and then combined with the calculated convective heat transfer coefficient of the target battery at present to calculate the heat transfer relationship parameter.

[0081] Optionally, in some embodiments, the step of "obtaining the heat transfer relationship parameter corresponding to the surface temperature and the internal temperature of the target battery through experimental tests" may specifically include:

[0082] Fabricate a test battery with a built-in temperature sensor, and the performance parameters of the test battery are the same as those of the target battery;

[0083] Specifically, according to the design and performance parameters of the target battery, a test battery is fabricated, and temperature sensors are implanted at key positions inside the battery. Ensure that the geometric structure, materials, and thermal characteristics of the test battery are the same as those of the target battery to obtain accurate heat transfer relationship parameters.

[0084] Conduct a thermal test on the test battery to measure the sample temperature data of the test battery, where the sample temperature data includes the sample surface temperature and the sample internal temperature;

[0085] Specifically, the test battery is subjected to a thermal test in a controlled environment to simulate various thermal conditions that the battery may encounter during actual use. During the thermal test, the surface temperature and the internal temperature of the test battery are measured and recorded in real time. The collected sample temperature data will be used for subsequent data analysis and determination of the heat transfer relationship parameter, providing an experimental basis for the determination of the heat transfer relationship parameter.

[0086] Perform fitting based on the sample temperature data to obtain the sample heat transfer relationship parameter between the sample surface temperature and the sample internal temperature of the test battery, and use the sample heat transfer relationship parameter as the heat transfer relationship parameter of the target battery;

[0087] Specifically, mathematical and statistical methods are used to analyze the collected sample temperature data to find the best-fitting relationship between the surface temperature and the internal temperature, and the heat transfer relationship parameters are determined through non-linear regression or other fitting techniques. The heat transfer relationship parameters obtained by testing the battery are applied to the target battery to estimate its internal temperature.

[0088] Optionally, in some embodiments, the step of "calculating the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery by theoretical calculation" may specifically include:

[0089] Obtain the structural type, material property parameters, and heat dissipation method of the target battery;

[0090] Specifically, obtain the detailed design information of the target battery, including the geometric structure of the battery, the thermophysical properties of the material (such as thermal conductivity, specific heat capacity, etc.), and the heat dissipation design (such as coolant type, flow mode, etc.).

[0091] Based on the structural type, material property parameters, and heat dissipation method, calculate the thermal resistance parameters from the inside to the surface of the target battery;

[0092] Specifically, apply the heat conduction theory, such as Fourier's law, to calculate the thermal resistance from the inside to the surface of the battery. For example, calculate the thermal resistance based on the thermal conductivity of the battery material and the geometric dimensions of the battery. In addition, numerical analysis methods, such as finite element analysis (FEA), can also be used for more accurate thermal resistance calculations. Consider the thermal characteristic changes of the battery under different working conditions for dynamic thermal resistance calculations.

[0093] Calculate the current convective heat transfer coefficient of the target battery;

[0094] Specifically, calculate the convective heat transfer coefficient according to the heat dissipation method of the battery and the characteristics of the coolant. For example, use computational fluid dynamics (CFD) software for simulation to obtain a more accurate convective heat transfer coefficient. Combine experimental data to verify and calibrate the CFD model.

[0095] Based on the thermal resistance parameters and the convective heat transfer coefficient, calculate the heat transfer relationship parameters between the internal temperature and the surface temperature of the battery;

[0096] Specifically, combine the thermal resistance parameters and the convective heat transfer coefficient, and calculate the heat transfer relationship parameter K between the internal temperature and the surface temperature of the battery through a mathematical model. In addition, the influence of battery aging and changes in operating conditions on the heat transfer relationship parameters needs to be considered to achieve dynamic adjustment.

[0097] In a specific embodiment, for a multi-layer wound cylindrical battery cell, according to the series thermal resistance superposition relationship of Fourier's law, the thermal resistance R from the core to the battery surface is obtained Core-Suface-圆柱 as:

[0098] RCore-Suface-圆柱 = ln(r cell / r 卷针 ) / (2π * λ 厚度方向 * l cell );

[0099] For a multi-layer laminated square-layer battery, according to the series thermal resistance superposition relationship of Fourier's law, the thermal resistance R from the core to the battery surface is obtained as: Core-Suface-方形 That is:

[0100] R Core-Suface-方形 = δ cell / (2 * λ 厚度方向 * L cell * W cell );

[0101] According to Newton's cooling formula, the thermal resistance between the battery surface and the heat dissipation environment is obtained:

[0102]

[0103] In the above formulas, λ 厚度方向 is the thermal conductivity in the thickness direction, λ 非厚度方向 is the thermal conductivity in the non-thickness direction, l cell is the height of the cylindrical battery, r cell is the radius of the cylindrical battery, r 卷针 is the radius of the cylindrical battery winding needle, L cell is the length of the square battery, W cell is the width of the square battery, δ cell is the thickness of the square battery, and A is the heat transfer area.

[0104] Optionally, in some embodiments, the step of "calculating the current convective heat transfer coefficient of the target battery" may specifically include:

[0105] Using the measured data back-calculation method to perform back-calculation based on experimental measurement data to obtain the current convective heat transfer coefficient of the target battery;

[0106] Specifically, one way to determine the convective heat transfer coefficient is the measured data back-calculation method. Select the stage without heat source (shelf cooling stage), test the target battery in a preset environment, and collect data such as the surface temperature, coolant inlet temperature, and outlet temperature of the battery under different working conditions. Using the above data, the convective heat transfer coefficient is back-calculated through a mathematical model. The convective heat transfer coefficient obtained by back-calculating from the measured data is closer to the actual working state, improving the accuracy of the internal temperature estimation.

[0107] Or, using the simulation method to perform simulation calculations on the target battery and the cooling system to obtain the current convective heat transfer coefficient of the target battery.

[0108] Specifically, another method for determining the convective heat transfer coefficient is the simulation method (transient method). By establishing a three-dimensional model of the battery and the cooling system, including the geometric shape of the battery, material properties, and the flow path of the coolant. Set parameters such as the initial temperature of the battery, the inlet temperature of the coolant, and the flow rate, and perform a simulation run. Then, fit the simulation results obtained from the simulation run to calculate the convective heat transfer coefficient.

[0109] Optionally, in some embodiments, the step of "using the measured data back-calculation method to perform back-calculation based on experimental measurement data to obtain the current convective heat transfer coefficient of the target battery" may specifically include:

[0110] Test the target battery in a preset environment to obtain test data;

[0111] Specifically, place the target battery in a preset environment that simulates actual working conditions, such as specific temperature, humidity, and airflow conditions. Perform battery performance tests on the target battery, including charge-discharge cycles, to simulate the thermal behavior of the battery during actual use and obtain the test data of the target battery. An environmental simulation chamber can be used to precisely control and adjust the conditions of the test environment.

[0112] Obtain the battery surface temperature, coolant inlet temperature, and coolant outlet temperature in the test data;

[0113] Specifically, during the test, use temperature sensors to accurately measure and record the temperature of the battery surface and the temperature of the coolant at the inlet and outlet. Wireless temperature sensors can be used to arrange sensors at different positions of the battery to reduce the impact on the physical state of the battery. Monitor through a real-time data monitoring system to ensure the real-time and accuracy of the data.

[0114] Perform back-calculation based on the battery surface temperature, coolant inlet temperature, and coolant outlet temperature to obtain the current convective heat transfer coefficient of the target battery;

[0115] Specifically, apply the principles of thermodynamics and fluid mechanics, combine the battery surface temperature and the coolant inlet and outlet temperatures, perform linear fitting on the temperature data to obtain a temperature change curve. Calculate the slope of the temperature change curve, which is the rate of change of the battery surface temperature. According to Newton's cooling formula:

[0116] q = h * A * ΔT = c * m * (ΔT cell / Δt); where q is the heat transfer amount between the battery surface and the heat dissipation environment, A is the battery surface area, h is the convective heat transfer coefficient, Δt is the difference between the battery surface temperature and the heat dissipation environment temperature, ΔT cellIt is the difference between the highest temperature and the lowest temperature inside the battery. Since the temperature inside the battery changes very little during the stage without heat source, it can be considered that the temperature inside the battery is the same as the surface temperature. Therefore, q can be approximated as the heat dissipated from the battery surface. By measuring the battery mass m, specific heat capacity c, and temperature change rate ΔT cell / Δt, the heat dissipated from the battery surface is calculated. Substituting the calculated heat transfer amount and temperature difference into Newton's cooling formula, the convective heat transfer coefficient h can be obtained.

[0117] The convective heat transfer coefficient is calculated through a mathematical model. For example, simulation is carried out using computational fluid dynamics (CFD) software to assist in the inverse calculation process. The convective heat transfer coefficient obtained by inverse calculation helps to evaluate the heat exchange efficiency between the battery and the environment. The method of inverse deduction from measured data provided in this embodiment improves the accuracy of battery internal temperature measurement through precise testing and inverse calculation.

[0118] Optionally, in some embodiments, the step of "performing simulation calculation on the target battery and the cooling system by the simulation method to obtain the current convective heat transfer coefficient of the target battery" may specifically include:

[0119] Construct a three-dimensional model corresponding to the target battery and the cooling system;

[0120] Specifically, using computer-aided design (CAD) software, a three-dimensional model of the target battery is constructed according to the actual size and shape of the target battery. At the same time, a three-dimensional model of the cooling system is designed and simulated, including the flow path of the coolant and the heat exchange interface. According to the actual battery structure and cooling system parameters, model parameters such as material properties and boundary conditions are set.

[0121] Set the initial temperature of the target battery, the inlet temperature of the coolant, and the coolant flow rate;

[0122] Specifically, the initial temperature of the battery is set in the simulation software to simulate the starting state of the battery under specific conditions. The inlet temperature and flow rate of the coolant are defined, and these parameters should match the conditions in actual applications. Specifically, the initial temperature of the battery is set, such as 70 °C or higher; the coolant temperature is set, such as 25 °C; the coolant flow rate is set, such as the flow rate in actual tests.

[0123] Based on the initial temperature of the target battery, the inlet temperature of the coolant, and the coolant flow rate, control the three-dimensional model to perform simulation operation to obtain the corresponding simulation results;

[0124] Specifically, run the simulation model to simulate the thermal behavior of the battery under the set conditions, including the processes of heat generation, conduction, and convection. Collect the temperature data during the simulation process, especially the temperature changes on the battery surface and the coolant. For example, run the simulation software for calculation to obtain the curve of the battery surface temperature changing with time.

[0125] Analyze and compare the simulation results to determine the current convective heat transfer coefficient of the target battery;

[0126] Specifically, analyze the temperature data obtained from the simulation, especially the temperature difference between the battery surface and the coolant. Based on these data, calculate the convective heat transfer coefficient and evaluate the heat exchange efficiency between the battery and the coolant. For example, use the same method as the back-calculation method with measured data, linearly fit the temperature change curve obtained from the simulation, and calculate the slope. Substitute the slope into Newton's cooling formula to obtain the convective heat transfer coefficient h.

[0127] Specifically, by establishing a three-dimensional model of the battery and the cooling system, the material assignment and mesh generation are not described here. After that, add a conjugate heat transfer module. In the heat transfer module, set the initial temperature of the battery T0 = 70 °C or higher, the fluid temperatures T_inlet (25 °C) and T_outlet, set the inlet velocity V_inlet of the coolant and the pressure outlet (atmospheric pressure) in the laminar flow module, and perform relevant calculations. The temperature change with time is obtained through simulation calculation: T Cell_surface-t and T Coolant -t, where T Cell_surface-t represents the temperature of the battery surface at time t. Here, "Cell" refers to the battery cell, and "surface" refers to the surface of the battery. This parameter is a key variable in battery thermal management because it affects the heat exchange and heat dissipation efficiency of the battery. T Coolant -t represents the temperature of the coolant at time t. "Coolant" refers to the fluid used to absorb heat from the battery and carry it away, which can be a liquid (such as water or a special coolant in a liquid cooling system) or a gas (such as an air cooling system). This parameter is also important because it directly relates to the heat exchange ability of the coolant and the thermal control of the battery.

[0128] The convective heat transfer coefficient obtained by the simulation method in this embodiment improves the accuracy of battery thermal management design; the simulation method can also predict the thermal behavior of the battery during the design stage, reduce the need for actual testing, and lower the development cost.

[0129] 103. Determine the internal temperature of the target battery based on the surface temperature, ambient temperature, and heat transfer relationship parameters.

[0130] Specifically, for step 103, use the collected surface temperature data, ambient temperature data, and heat transfer relationship parameter K to calculate the internal temperature of the battery through a mathematical model. For example, apply the formula T Cor e = K * (T Surface - T Coolant ) + T Surface for calculation.

[0131] In addition, it is also possible to combine the working state of the battery (such as the charge and discharge rate) and historical temperature data to perform real-time prediction and adjustment of the internal temperature. And an adaptive algorithm is adopted to dynamically adjust the heat transfer relationship parameter K according to real-time data.

[0132] In summary, for the battery temperature measurement method provided by the embodiments of the present application, first, the surface temperature and the ambient temperature of the target battery are measured; then, the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery are determined; finally, based on the surface temperature, the ambient temperature, and the heat transfer relationship parameters, the internal temperature of the target battery is determined. For the battery temperature measurement solution provided by the embodiments of the present application, by accurately obtaining the surface temperature and the ambient temperature of the battery, and calculating the internal temperature of the battery in combination with the heat transfer relationship parameters of the battery, it is possible to quickly and accurately measure the internal temperature of the battery without relying on complex built-in temperature sensors, thereby improving the efficiency of battery testing and research and development, avoiding the high cost of manufacturing a large number of batteries with built-in temperature sensors, reducing material and manufacturing costs, and at the same time reducing the additional costs caused by the low yield rate of batteries with built-in temperature sensors, accelerating the time from research and development to market of battery products, and shortening the development cycle.

[0133] In addition, the embodiments of the present application also provide an electronic device, such as Figure 3 shown, which shows a schematic structural diagram of the electronic device involved in the embodiments of the present application. Specifically:

[0134] The electronic device may include a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, an input unit 304, and other components. Those skilled in the art can understand that Figure 3 the structural diagram of the electronic device shown in does not constitute a limitation on the electronic device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Among them:

[0135] The processor 301 is the control center of the electronic device, connecting various parts of the entire electronic device through various interfaces and lines, and by running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, performing various functions of the electronic device and processing data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modulation and demodulation processor, where the application processor mainly processes the operating system, user interface, and application programs, and the modulation and demodulation processor mainly processes wireless communication. It can be understood that the above modulation and demodulation processor may not be integrated into the processor 301.

[0136] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and battery temperature measurements by running the software programs and modules stored in the memory 302. The memory 302 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the electronic device. In addition, the memory 302 can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory 302 can also include a memory controller to provide the processor 301 with access to the memory 302.

[0137] The electronic device further includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 303 can also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0138] The electronic device may further include an input unit 304, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0139] Although not shown, the electronic device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302 to implement various functions as follows:

[0140] Measure the surface temperature and ambient temperature of the target battery; determine the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery; based on the surface temperature, ambient temperature, and heat transfer relationship parameters, determine the internal temperature of the target battery.

[0141] For the specific implementation of each of the above operations, reference can be made to the previous embodiments, which will not be elaborated here.

[0142] The battery temperature measurement solution provided by this application can accurately obtain the surface temperature and ambient temperature of the battery, and calculate the internal temperature of the battery by combining the heat transfer relationship parameters of the battery, so as to achieve rapid and accurate measurement of the internal temperature of the battery without relying on complex built-in temperature sensors, thereby improving the efficiency of battery testing and research and development, avoiding the high cost of manufacturing a large number of batteries with built-in temperature sensors, reducing material and manufacturing costs, and at the same time reducing the additional costs caused by the low yield rate of batteries with built-in temperature sensors, accelerating the time from research and development to market of battery products, and shortening the development cycle.

[0143] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructions, or by controlling relevant hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0144] For this reason, an embodiment of this application provides a storage medium, which stores multiple instructions that can be loaded by a processor to execute the steps in any battery temperature measurement method provided by the embodiment of this application. For example, the instructions can execute the following steps:

[0145] Measure the surface temperature and ambient temperature of the target battery; determine the heat transfer relationship parameters corresponding to the surface temperature and internal temperature of the target battery; based on the surface temperature, ambient temperature and heat transfer relationship parameters, determine the internal temperature of the target battery.

[0146] For the specific implementation of each of the above operations, reference can be made to the previous embodiments and will not be elaborated here.

[0147] Among them, the storage medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc.

[0148] Since the instructions stored in the storage medium can execute the steps in any battery temperature measurement method provided by the embodiment of this application, the beneficial effects that can be achieved by any battery temperature measurement method provided by the embodiment of this application can be realized. For details, refer to the previous embodiments and will not be elaborated here.

[0149] The above has introduced in detail a battery temperature measurement method, device, electronic device, and storage medium provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for measuring battery temperature, characterized in that, Including: Measuring the surface temperature and the ambient temperature of the target battery; Determining the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery; Based on the surface temperature, the ambient temperature, and the heat transfer relationship parameters, determining the internal temperature of the target battery.

2. The battery temperature measurement method according to claim 1, wherein The measuring the surface temperature and the ambient temperature of the target battery includes: Placing the target battery in a bellows or oil bath environment; Performing temperature measurement on the target battery and its surrounding environment through a temperature measuring device to obtain the surface temperature and the ambient temperature of the target battery.

3. The battery temperature measurement method according to claim 1, wherein, The determining the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery includes: Obtaining the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery through experimental testing; Or, calculating the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery through theoretical calculation.

4. The battery temperature measurement method according to claim 3, wherein, The obtaining the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery through experimental testing includes: Fabricating a test battery with an in-built temperature sensor, where the performance parameters of the test battery are consistent with those of the target battery; Performing a thermal test on the test battery and measuring the sample temperature data of the test battery, where the sample temperature data includes the sample surface temperature and the sample internal temperature; Based on the sample temperature data, performing fitting to obtain the sample heat transfer relationship parameters between the sample surface temperature and the sample internal temperature of the test battery, and using the sample heat transfer relationship parameters as the heat transfer relationship parameters of the target battery.

5. The battery temperature measurement method according to claim 3, characterized in that, The calculating the heat transfer relationship parameters corresponding to the surface temperature and the internal temperature of the target battery through theoretical calculation includes: Obtaining the structural type, material characteristic parameters, and heat dissipation method of the target battery; Based on the structural type, material characteristic parameters, and heat dissipation method, calculating the thermal resistance parameters from the inside to the surface of the target battery; Calculating the current convective heat transfer coefficient of the target battery; Based on the thermal resistance parameters and the convective heat transfer coefficient, calculating the heat transfer relationship parameters between the internal temperature and the surface temperature of the battery.

6. The battery temperature measurement method according to claim 5, wherein The calculating the current convective heat transfer coefficient of the target battery includes: Using the measured data back-calculation method to perform back-calculation based on experimental measurement data to obtain the current convective heat transfer coefficient of the target battery; Or, using the simulation method to perform simulation calculation on the target battery and the cooling system to obtain the current convective heat transfer coefficient of the target battery.

7. The battery temperature measurement method according to claim 6, wherein The using the measured data back-calculation method to perform back-calculation based on experimental measurement data to obtain the current convective heat transfer coefficient of the target battery includes: Testing the target battery in a preset environment to obtain test data; Obtaining the battery surface temperature, coolant inlet temperature, and coolant outlet temperature in the test data; Based on the battery surface temperature, the coolant inlet temperature, and the coolant outlet temperature, performing back-calculation to obtain the current convective heat transfer coefficient of the target battery.

8. The battery temperature measurement method according to claim 6, characterized in that, The using the simulation method to perform simulation calculation on the target battery and the cooling system to obtain the current convective heat transfer coefficient of the target battery includes: Build a three-dimensional model corresponding to the target battery and the cooling system; Set the initial temperature of the target battery, the coolant inlet temperature, and the coolant flow rate; Based on the initial temperature of the target battery, the coolant inlet temperature, and the coolant flow rate, control the three-dimensional model to perform a simulation run to obtain corresponding simulation results; Analyze and compare the simulation results to determine the current convective heat transfer coefficient of the target battery.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, When the processor executes the program, it implements the steps of the battery temperature measurement method according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, wherein when the computer program is executed by a processor, it implements the steps of the battery temperature measurement method according to any one of claims 1-8.

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