Method and device for calibrating electric quantity of lithium polymer battery

Abstract

The invention is suitable for the technical field of electric digital data processing, and provides a lithium polymer battery electric quantity calibration method and device, and the method comprises the steps: collecting a current charging voltage in a charging state; obtaining a mapping relation between the charging voltage and an actual battery voltage, and matching the actual battery voltage corresponding to the current charging voltage according to the mapping relation; calculating the aging degree of the battery according to the internal resistance growth rate, the open-circuit voltage drop rate, the discharge voltage attenuation rate and the current battery cycle index, and matching the aging attenuation based on the aging degree; calculating the initial electric quantity of the lithium polymer battery according to the actual battery voltage; and calculating the actual electric quantity of the lithium polymer battery according to the initial electric quantity and the aging attenuation. Through the steps, the electric quantity calibration method provided by the invention remarkably improves the accuracy of electric quantity calibration of the lithium polymer battery, so that the electric quantity display of the battery is more real and reliable, and the performance of a battery management system is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical digital data processing, and in particular relates to a lithium polymer battery power calibration method and device. Background Art

[0002] Lithium polymer batteries are widely used in mobile devices, power tools, electric vehicles and other fields because of their high energy density, light weight, and flexible shape. However, as the use time increases, the performance of lithium polymer batteries will gradually decline, especially the decline in battery capacity and discharge capacity, which poses a challenge to the user experience and safety of the device. Therefore, how to accurately calibrate the battery power and evaluate the battery health status has become the focus of the industry.

[0003] Most existing battery capacity calibration methods are based on the relationship between open circuit voltage (OCV) and battery capacity. However, it is difficult to obtain the open circuit voltage of lithium polymer batteries in actual use, because the battery is usually in a charging and discharging state, and it is difficult to stop and measure the open circuit voltage. In addition, the internal resistance of the battery will increase with the increase of usage time and cycle number, resulting in more complex changes in battery voltage during the charging and discharging process. The accuracy of capacity calibration based solely on open circuit voltage is low. Summary of the invention

[0004] In view of this, the embodiments of the present invention provide a lithium polymer battery power calibration method and device to solve the technical problem of low accuracy of power calibration based solely on open circuit voltage.

[0005] A first aspect of an embodiment of the present invention provides a lithium polymer battery power calibration method, the lithium polymer battery power calibration method comprising:

[0006] In the charging state, collect the current charging voltage;

[0007] Acquire a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship;

[0008] The aging degree of the battery is calculated according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and the aging decay amount is matched based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process;

[0009] Calculate the initial capacity of the lithium polymer battery according to the actual battery voltage;

[0010] The actual power of the lithium polymer battery is calculated according to the initial power and the aging attenuation.

[0011] Furthermore, the step of obtaining a mapping relationship between a charging voltage and an actual battery voltage, and matching the actual battery voltage corresponding to the current charging voltage according to the mapping relationship comprises:

[0012] Input the current charging voltage into the following mapping relationship to obtain the actual battery voltage;

[0013] The mapping relationship is:

[0014]

[0015] Among them, V b Indicates the actual battery voltage, V c represents the current charging voltage, I represents the current charging current, R i represents the internal resistance, A represents a constant related to the battery material and chemical characteristics, T represents the battery temperature, and T 0 represents the reference temperature, n represents the temperature influence index, V oc Represents the open circuit voltage of the battery, V max Indicates the maximum voltage of the battery.

[0016] Further, the step of calculating the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and matching the aging decay amount based on the aging degree includes:

[0017] Inputting the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number into the first function to obtain the aging degree output by the first function;

[0018] Input the aging degree into the following second function to obtain the aging attenuation output by the second function;

[0019] The first function is:

[0020]

[0021] The second function is:

[0022] D(A)=D 0 ·A

[0023] Among them, A represents the degree of aging, r int represents the internal resistance growth rate, r OCV Indicates the open circuit voltage drop rate, r DisV Indicates the discharge voltage decay rate, N indicates the current battery cycle number, N 0 represents the rated battery cycle number, σ represents the constant term, and w 1 represents the first weight coefficient, w 2 represents the second weight coefficient, w3 represents the third weight coefficient, k represents the adjustment coefficient, D(A) represents the aging attenuation, and D 0 Represents the linear coefficient.

[0024] Furthermore, the step of calculating the initial power of the lithium polymer battery according to the actual battery voltage includes:

[0025] Obtaining a relationship curve between battery voltage and power; the relationship curve is curve information pre-fitted based on multiple sets of battery voltages and power;

[0026] In the relationship curve, the initial power corresponding to the actual battery voltage is extracted.

[0027] Furthermore, the step of calculating the actual power of the lithium polymer battery according to the initial power and the aging attenuation comprises:

[0028] Collect the current ambient temperature and calculate the power attenuation rate corresponding to the current ambient temperature;

[0029] The actual power of the lithium polymer battery is calculated according to the initial power, the power attenuation rate and the aging attenuation.

[0030] Furthermore, the step of collecting the current ambient temperature and calculating the power attenuation rate corresponding to the current ambient temperature includes:

[0031] The current ambient temperature is collected, and the current ambient temperature is input into the temperature attenuation function to obtain the power attenuation rate of the lithium polymer battery output by the temperature attenuation function under the current ambient temperature;

[0032] The temperature decay function is:

[0033]

[0034] Where D(T) represents the power attenuation rate at the current ambient temperature, E a represents the energy required for the battery chemical reaction, τ represents the Boltzmann constant, T represents the current ambient temperature, and T 0 represents the reference temperature, and ψ represents the empirical value.

[0035] Furthermore, the step of calculating the actual power of the lithium polymer battery according to the initial power, the power attenuation rate and the aging attenuation comprises:

[0036] Subtracting the initial power from the aging attenuation to obtain a first value;

[0037] Multiplying the initial power by the power attenuation rate to obtain a second value;

[0038] The first value is subtracted from the second value to obtain the actual power of the lithium polymer battery.

[0039] A second aspect of an embodiment of the present invention provides a lithium polymer battery power calibration device, comprising:

[0040] A collection unit, used to collect the current charging voltage in the charging state;

[0041] A matching unit, used to obtain a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship;

[0042] A first calculation unit is used to calculate the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and match the aging decay amount based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process;

[0043] A second calculation unit, used for calculating the initial power of the lithium polymer battery according to the actual battery voltage;

[0044] The third calculation unit is used to calculate the actual power of the lithium polymer battery according to the initial power and the aging attenuation.

[0045] A third aspect of an embodiment of the present invention provides a terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the lithium polymer battery power calibration method described in the first aspect when executing the computer program.

[0046] A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the lithium polymer battery power calibration method described in the first aspect are implemented.

[0047] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: in the charging state, the current charging voltage is collected in real time, and the actual battery voltage corresponding to the current charging voltage is accurately matched through the mapping relationship between the pre-acquired charging voltage and the actual battery voltage. This process greatly improves the accuracy of voltage measurement and avoids errors caused by voltage fluctuations in the charging state. The method introduces parameters such as the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number to calculate the aging degree of the battery, and matches the corresponding aging decay amount based on the aging degree. This approach of comprehensively considering the battery aging factors makes the power calibration more accurate and reflects the actual use of the battery. The initial power of the lithium polymer battery is calculated by the actual battery voltage to ensure the accuracy of the initial power of the battery at different use stages. The actual power of the lithium polymer battery is further calculated by combining the initial power and the aging decay amount. This calculation method fully considers the changes in the performance of the battery during use and ensures the accuracy of the power calibration. Through the above steps, the power calibration method provided by the present invention significantly improves the accuracy of the lithium polymer battery power calibration, makes the battery power display more real and reliable, and thus improves the performance of the battery management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic flow chart of a lithium polymer battery power calibration method provided by the present invention is shown;

[0050] Figure 2 A schematic diagram of a lithium polymer battery power calibration device provided by an embodiment of the present invention is shown;

[0051] Figure 3 A schematic diagram of a terminal device provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0052] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0053] The embodiment of the present invention provides a lithium polymer battery power calibration method and device to solve the technical problem of low accuracy of power calibration based solely on open circuit voltage.

[0054] First, the present invention provides a lithium polymer battery power calibration method. Figure 1 , Figure 1 FIG. 1 is a schematic flow chart of a lithium polymer battery power calibration method provided by the present invention. Figure 1 As shown, the lithium polymer battery power calibration method may include the following steps:

[0055] Step 101: Under charging state, collecting the current charging voltage;

[0056] During the charging process, the battery charging voltage is measured in real time. The charging voltage is usually higher than the actual voltage of the battery, especially when the battery is not fully charged.

[0057] Step 102: Acquire a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship;

[0058] There is a certain deviation between the battery charging voltage and the actual battery voltage, and this deviation varies with the charging state. By establishing a mapping relationship between the charging voltage and the actual battery voltage through experiments or modeling, we can more accurately calculate the actual battery voltage instead of just relying on the measured charging voltage.

[0059] The actual battery voltage corresponding to the current charging voltage is matched according to the mapping relationship. Once the mapping relationship is established, the actual battery voltage can be estimated based on the currently measured charging voltage using this relationship.

[0060] Among them, the mapping relationship between the charging voltage and the actual battery voltage is as follows:

[0061] Specifically, step 102 includes the following steps:

[0062] Input the current charging voltage into the following mapping relationship to obtain the actual battery voltage;

[0063] The mapping relationship is:

[0064]

[0065] Among them, V b Indicates the actual battery voltage, V c represents the current charging voltage, I represents the current charging current, R i represents the internal resistance, A represents a constant related to the battery material and chemical characteristics, T represents the battery temperature, T 0represents the reference temperature, n represents the temperature influence index, V oc Represents the open circuit voltage of the battery, V max Indicates the maximum voltage of the battery.

[0066] It is worth noting that during the battery charging process, the actual voltage of the battery is usually lower than the charging voltage. This is because there is a certain internal resistance R inside the battery. i When the charging current flows through the battery, the internal resistance will cause a voltage drop, that is, the charging voltage V c and battery voltage V b This difference is described by the "internal resistance voltage drop" part in the mapping relationship: V b =V c -I·R i Here, I.R. i Indicates the voltage drop caused by internal resistance. Internal resistance R i It is the resistance inside the battery, which changes with battery aging, temperature changes, and the battery's state of charge (SOC), so it needs to be dynamically calculated in practical applications.

[0067] The electrochemical properties and internal resistance of the battery are closely related to temperature. As the temperature changes, the performance and charging characteristics of the battery change. For example, when the temperature rises, the internal resistance of the battery usually increases, and the open circuit voltage V oc In order to accurately describe the relationship between charging voltage and battery voltage under temperature changes, the formula needs to introduce temperature factors. The temperature effect part in the formula is expressed by: The function of this part is to simulate the effect of temperature change on battery voltage, especially the change of open circuit voltage and internal resistance of the battery at different temperatures.

[0068] Internal resistance R i It is a factor that cannot be ignored during the battery charging and discharging process. The internal resistance will change with factors such as the battery's health status, battery charge status, and temperature. In the formula, the impact of the internal resistance is weighted in the difference between the charging voltage and the battery voltage. The internal resistance not only affects the voltage drop during the charging process, but also affects the battery's temperature rise and charging efficiency to a certain extent.

[0069] Through these principles, the mapping relationship integrates the effects of temperature, internal resistance, open circuit voltage and other factors on battery voltage, and can more accurately map the charging voltage to the actual battery voltage, which can be used for real-time monitoring and optimization of the battery management system. The mapping relationship design principle relies on the electrochemical characteristics and physical laws of the battery, and aims to accurately simulate the voltage changes during the battery charging process, while taking into account factors such as temperature changes and internal resistance effects to ensure that the actual battery voltage can be accurately predicted under various conditions.

[0070] Step 103: Calculate the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and match the aging decay amount based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process;

[0071] The internal resistance of the battery will increase with the increase of usage time and charge and discharge cycle number. The increase of internal resistance directly affects the discharge performance of the battery (the battery voltage will drop more rapidly). By measuring the increase of the internal resistance of the battery, the degree of battery aging can be inferred.

[0072] Open circuit voltage (OCV) is the voltage of a battery when there is no load. As the battery is used, the open circuit voltage will gradually decrease. This rate of decrease is an important indicator of battery aging. By monitoring the changes in OCV, the health status of the battery can be estimated.

[0073] The discharge voltage decay rate refers to the speed at which the battery voltage drops during the discharge process. This rate is related to factors such as the battery's chemical properties, internal resistance, and the remaining battery capacity. As the battery ages, the discharge voltage decay rate will accelerate.

[0074] The number of battery cycles (i.e., the number of charge and discharge cycles) is closely related to battery aging. As the number of cycles increases, the battery capacity gradually decreases and the performance deteriorates. This factor also needs to be taken into account in order to accurately determine the degree of battery aging.

[0075] The degree of battery aging can be estimated by combining factors such as internal resistance growth rate, OCV drop rate, discharge voltage decay rate, and battery cycle times. This is a key step in calibrating the battery charge, because battery aging directly affects the actual battery charge and remaining capacity.

[0076] According to the calculated aging degree and the aging attenuation corresponding to different aging degrees, the aging attenuation corresponding to the current aging degree is obtained.

[0077] The aging degree estimation process and aging attenuation matching logic are as follows:

[0078] Specifically, step 103 specifically includes step 1031 to step 1032:

[0079] Step 1031: inputting the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number into the first function to obtain the aging degree output by the first function;

[0080] Step 1032: input the aging degree into the following second function to obtain the aging attenuation output by the second function;

[0081] The first function is:

[0082]

[0083] The second function is:

[0084] D(A)=D 0 ·A

[0085] Among them, A represents the degree of aging, r int represents the internal resistance growth rate, r OCV Indicates the open circuit voltage drop rate, r DisV Indicates the discharge voltage decay rate, N indicates the current battery cycle number, N 0 represents the rated battery cycle number, σ represents the constant term, and w 1 represents the first weight coefficient, w 2 represents the second weight coefficient, w 3 represents the third weight coefficient, k represents the adjustment coefficient, D(A) represents the aging attenuation, and D 0 Represents the linear coefficient.

[0086] It is worth noting that the internal resistance growth rate is that as the battery is used, the internal resistance of the battery usually increases gradually. The increase in internal resistance will cause the voltage of the battery to drop and the efficiency to decrease during discharge.

[0087] The open circuit voltage of a battery (the voltage when no load is connected) is also an indicator of the battery's health. The open circuit voltage typically decreases with aging.

[0088] Discharge voltage decay rate During the discharge process, the operating voltage of the battery will decrease as the number of cycles increases. This is because the efficiency of the chemical reaction inside the battery decreases.

[0089] Battery cycle count is the number of charge and discharge cycles a battery has gone through and is a direct measure of battery aging.

[0090] The first function combines the internal resistance growth rate, the open circuit voltage drop rate and the discharge voltage decay rate into a comprehensive aging factor A.

[0091] The aging of the battery may be slow in the early stage, but as the number of cycles increases, the aging speed increases. The first function can fit this growth trend well.

[0092] This term is used to adjust the aging rate so that the aging degree A increases faster when approaching the design life. The parameter k controls the steepness of the growth curve.

[0093] By comprehensively considering the three key parameters of battery internal resistance growth rate, open circuit voltage drop rate and discharge voltage decay rate, and combining the number of battery cycles (number of charge and discharge cycles), function 1 can provide a more comprehensive and accurate evaluation of battery aging. This comprehensive evaluation method can better reflect the actual aging state of the battery during actual use.

[0094] Step 104: Calculating the initial power of the lithium polymer battery according to the actual battery voltage;

[0095] There is a certain relationship between the battery's charge and its voltage. Although this relationship is affected by many factors, the calibrated battery voltage can more accurately estimate the battery's initial charge.

[0096] Specifically, step 104 includes steps 1041 to 1042:

[0097] Step 1041: Obtain a relationship curve between battery voltage and power; the relationship curve is curve information pre-fitted based on multiple sets of battery voltages and power;

[0098] There is a certain relationship between the voltage and power of lithium polymer batteries. Usually, the voltage of the battery changes with the charging and discharging process of the battery. In a standard charging and discharging process, the battery voltage will change nonlinearly with the change of power. Therefore, the battery power can be indirectly calculated through the battery voltage.

[0099] Step 1042: extracting the initial power corresponding to the actual battery voltage from the relationship curve.

[0100] In order to accurately estimate the battery capacity, it is first necessary to establish a mathematical relationship curve between the battery voltage and the capacity. This relationship curve is usually obtained through experimental data. In the experiment, the battery voltage and the corresponding capacity are measured at different charging / discharging stages, and multiple sets of data points are collected. Then, through data fitting (such as statistical methods such as least squares method), a mathematical model or curve reflecting the relationship between the battery voltage and capacity is obtained.

[0101] This relationship curve is usually expressed as follows: within a certain battery voltage range, the battery power will change with the voltage. This curve may be different for different batteries and different usage environments, so it must be fitted based on the actual battery.

[0102] In order to improve the accuracy and adaptability of the relationship curve, multiple sets of battery data are usually used for fitting. By collecting voltage and power data from different batteries (which may have different manufacturing batches, different usage cycles, different temperature environments, etc.), a more representative and universal relationship curve can be obtained.

[0103] In this embodiment, by fitting the relationship curve based on multiple sets of battery voltage and power test data in advance, the initial power of the battery can be extracted without complicated real-time calculation process. The initial power of the battery can be efficiently obtained by simply substituting the actual battery voltage into the relationship curve, thereby simplifying the workflow of battery power evaluation.

[0104] Step 105: Calculate the actual power of the lithium polymer battery according to the initial power and the aging attenuation.

[0105] Since the aging of the battery will cause the actual value of the battery power to be lower than the theoretical value, the final power calculation needs to take this decay into account. Combining the initial power of the battery with the aging decay, the actual remaining power of the lithium polymer battery can be obtained. The specific calculation logic of the actual power is as follows:

[0106] Specifically, step 105 specifically includes step 1051 to step 1052:

[0107] Step 1051: collecting the current ambient temperature and calculating the power attenuation rate corresponding to the current ambient temperature;

[0108] This step refers to obtaining the temperature of the battery environment in real time. Ambient temperature is an important factor affecting battery performance, especially in lithium polymer batteries, where temperature significantly affects the battery's chemical reaction rate, internal resistance, and battery charge and discharge efficiency.

[0109] Temperature has a direct impact on battery performance. Generally speaking, lower temperatures will increase the internal resistance of the battery, reduce discharge efficiency, and thus reduce the available power of the battery. Higher temperatures will accelerate the chemical reactions inside the battery, which may cause the battery to overheat and age faster, affecting battery life and even causing safety issues.

[0110] In order to accurately quantify the impact of temperature on battery power, it is necessary to calculate the battery power attenuation rate under different temperature conditions through modeling. The temperature attenuation rate represents the attenuation of the effective power of the battery due to temperature changes under a specific ambient temperature. For example, in a low temperature environment, the battery's attenuation rate will increase, and conversely, it may also accelerate at high temperatures.

[0111] The specific logic for calculating the power attenuation rate corresponding to the current ambient temperature is as follows:

[0112] Specifically, step 1051 includes the following steps:

[0113] The current ambient temperature is collected, and the current ambient temperature is input into the temperature attenuation function to obtain the power attenuation rate of the lithium polymer battery output by the temperature attenuation function under the current ambient temperature;

[0114] The temperature decay function is:

[0115]

[0116] Where D(T) represents the power attenuation rate at the current ambient temperature, E a represents the energy required for the battery chemical reaction, τ represents the Boltzmann constant, T represents the current ambient temperature, and T 0 represents the reference temperature, and ψ represents the empirical value. The empirical value refers to the standard battery power attenuation rate.

[0117] It is worth noting that the empirical value refers to the standard battery power decay rate. a It needs to be fitted and adjusted according to the specific battery type and experimental data.

[0118] The temperature decay function describes the effect of temperature on the rate of chemical reactions. The higher the temperature, the greater the kinetic energy of the molecules and the faster the reaction rate. a The energy barrier required for a reaction. A higher activation energy means that the reaction requires more energy to proceed, so the reaction rate is slower at lower temperatures. τ plays the role of converting temperature into an energy scale in the formula, connecting the relationship between temperature and energy.

[0119] By incorporating ambient temperature into the calculation of battery decay rate, the temperature decay function can more accurately predict the lifetime of the battery under different temperature conditions. This is very important for the design and use of batteries, especially in extreme temperature environments such as electric vehicles, grid energy storage systems and portable electronic devices.

[0120] Step 1052: Calculate the actual power of the lithium polymer battery according to the initial power, the power attenuation rate and the aging attenuation.

[0121] By collecting the current ambient temperature and calculating the corresponding power decay rate based on the temperature, the effect of temperature on the performance of lithium polymer batteries is fully considered. Ambient temperature is a key factor affecting the chemical reaction rate and internal impedance of the battery. In high or low temperature environments, the power decay rate of the battery may change significantly. The present invention can effectively improve the accuracy of battery power estimation by dynamically adjusting the decay rate. The present invention not only takes into account the aging decay of the battery, but also combines the power decay rate caused by temperature, which makes the actual battery power calculation more comprehensive and accurate. By simultaneously considering the initial power, power decay rate, aging decay and temperature factors, the power estimation error that may be caused by ignoring the influence of the external environment by the traditional calculation method is avoided.

[0122] The initial capacity is usually calculated based on the normal charge and discharge state of the battery without aging and temperature influence, assuming that it is not affected by external environmental factors and the battery capacity is a standard value at a certain moment.

[0123] The ambient temperature affects the discharge characteristics of the battery, causing the power attenuation rate to change. Through the previous calculation of the temperature attenuation rate, the attenuation caused by the ambient temperature can be obtained. This attenuation is usually proportional to the ambient temperature.

[0124] Battery aging is inevitable. With the increase of time and charge and discharge cycles, the actual available power of the battery will gradually decrease. The aging attenuation has comprehensively considered factors such as internal resistance growth, open circuit voltage drop, discharge voltage attenuation rate and cycle number, and gives the power attenuation after battery aging.

[0125] The temperature attenuation of the battery power is calculated by the ambient temperature, and then combined with the initial battery power. Then, combined with the power attenuation caused by aging, the actual battery power is finally calculated. The specific calculation process is as follows:

[0126] Specifically, step 1052 specifically includes steps A1 to A3:

[0127] Step A1: subtract the initial power from the aging attenuation to obtain a first value;

[0128] By subtracting the initial power from the aging attenuation, the power affected by aging is removed. This value represents the effective power of the battery at the current stage of use (without considering the influence of other factors).

[0129] Step A2: multiplying the initial power by the power attenuation rate to obtain a second value;

[0130] By multiplying the initial power by the power attenuation rate, we can get a attenuation value related to environmental changes or usage status. This part represents the additional power loss caused by the battery's degradation in the current environment or usage status.

[0131] Step A3: subtract the first value from the second value to obtain the actual power of the lithium polymer battery.

[0132] The actual power of the lithium polymer battery is obtained by subtracting the first value (power after removing the aging attenuation) from the second value (additional attenuation calculated based on the power attenuation rate). The key to this method is that the first value has taken the aging attenuation into account, while the second value is the influence of the external environment or usage conditions introduced by the power attenuation rate. Therefore, the result after subtraction can more accurately reflect the remaining power of the battery in actual use.

[0133] Traditional methods often only consider the initial battery power or a single attenuation factor, while the present invention combines the battery power decay rate and aging decay at the same time to more accurately reflect the battery power loss during actual use, thereby avoiding overestimation of the remaining battery power. By calculating the difference between the initial power and the aging decay, and the product of the initial power and the power decay rate, and then calculating the difference to obtain the actual power, not only is the calculation process simple, but also a more accurate remaining battery power can be obtained in a shorter time, facilitating real-time monitoring of the battery status. This technical solution enables the battery management system to more accurately predict the remaining battery power in actual use, thereby optimizing the battery's charge and discharge management, improving battery efficiency and extending battery life, and avoiding unnecessary battery loss during use.

[0134] In this embodiment, in the charging state, the current charging voltage is collected in real time, and the actual battery voltage corresponding to the current charging voltage is accurately matched through the mapping relationship between the pre-acquired charging voltage and the actual battery voltage. This process greatly improves the accuracy of voltage measurement and avoids errors caused by voltage fluctuations in the charging state. The method introduces parameters such as the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number to calculate the aging degree of the battery, and matches the corresponding aging attenuation based on the aging degree. This approach of comprehensively considering the battery aging factors makes the power calibration more accurate and reflects the actual use of the battery. The initial power of the lithium polymer battery is calculated by the actual battery voltage to ensure the accuracy of the initial power of the battery at different use stages. Combined with the initial power and the aging attenuation, the actual power of the lithium polymer battery is further calculated. This calculation method fully considers the changes in the performance of the battery during use and ensures the accuracy of the power calibration. Through the above steps, the power calibration method provided by the present invention significantly improves the accuracy of the lithium polymer battery power calibration, making the battery power display more real and reliable, thereby improving the performance of the battery management system.

[0135] like Figure 2 The present invention provides a lithium polymer battery power calibration device, see Figure 2 , Figure 2 A schematic diagram of a lithium polymer battery power calibration device provided by the present invention is shown. Figure 2 A lithium polymer battery capacity calibration device is shown, comprising:

[0136] The collection unit 21 is used to collect the current charging voltage in the charging state;

[0137] A matching unit 22, configured to obtain a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship;

[0138] The first calculation unit 23 is used to calculate the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and match the aging decay amount based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process;

[0139] A second calculation unit 24, used for calculating the initial power of the lithium polymer battery according to the actual battery voltage;

[0140] The third calculation unit 25 is used to calculate the actual power of the lithium polymer battery according to the initial power and the aging attenuation.

[0141] The present invention provides a lithium polymer battery power calibration device, which collects the current charging voltage in real time under the charging state, and accurately matches the actual battery voltage corresponding to the current charging voltage through the mapping relationship between the pre-acquired charging voltage and the actual battery voltage. This process greatly improves the accuracy of voltage measurement and avoids errors caused by voltage fluctuations under the charging state. The method introduces parameters such as the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number to calculate the aging degree of the battery, and matches the corresponding aging decay amount based on the aging degree. This method of comprehensively considering the battery aging factors makes the power calibration more accurate and reflects the actual use of the battery. The initial power of the lithium polymer battery is calculated by the actual battery voltage to ensure the accuracy of the initial power of the battery at different use stages. The actual power of the lithium polymer battery is further calculated by combining the initial power and the aging decay amount. This calculation method fully considers the changes in the performance of the battery during use and ensures the accuracy of the power calibration. Through the above steps, the power calibration method provided by the present invention significantly improves the accuracy of the lithium polymer battery power calibration, makes the battery power display more real and reliable, and thus improves the performance of the battery management system.

[0142] Figure 3 Schematic diagram of a terminal device provided by an embodiment of the present invention. Figure 3 As shown, a terminal device 3 of this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30, such as a lithium polymer battery power calibration program. When the processor 30 executes the computer program 32, the steps in each of the above-mentioned lithium polymer battery power calibration method embodiments are implemented, such as Figure 1 Alternatively, when the processor 30 executes the computer program 32, the functions of each unit in the above-mentioned device embodiments are realized, for example, Figure 2 Function of the unit shown.

[0143] Exemplarily, the computer program 32 may be divided into one or more units, which are stored in the memory 31 and executed by the processor 30 to complete the present invention. The one or more units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 32 in the terminal device 3. For example, the computer program 32 may be divided into the following specific functions of each unit:

[0144] A collection unit, used to collect the current charging voltage in the charging state;

[0145] A matching unit, used to obtain a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship;

[0146] A first calculation unit is used to calculate the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and match the aging decay amount based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process;

[0147] A second calculation unit, used for calculating the initial power of the lithium polymer battery according to the actual battery voltage;

[0148] The third calculation unit is used to calculate the actual power of the lithium polymer battery according to the initial power and the aging attenuation.

[0149] The terminal device includes but is not limited to a processor 30 and a memory 31. Those skilled in the art will appreciate that Figure 3 It is only an example of a terminal device 3 and does not constitute a limitation on the terminal device 3. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0150] The processor 30 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0151] The memory 31 may be an internal storage unit of the terminal device 3, such as a hard disk or memory of the terminal device 3. The memory 31 may also be an external storage device of the terminal device 3, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device 3. Further, the memory 31 may also include both an internal storage unit and an external storage device of the terminal device 3. The memory 31 is used to store the computer program and other programs and data required by the roaming control device. The memory 31 may also be used to temporarily store data that has been output or is to be output.

[0152] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0153] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present invention. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0154] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0155] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0156] An embodiment of the present invention provides a computer program product. When the computer program product runs on a mobile terminal, the mobile terminal can implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0157] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the camera device / terminal device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a disk or an optical disk.

[0158] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0159] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0160] In the embodiments provided by the present invention, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0161] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed over multiple network units.

[0162] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0163] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0164] As used in the present specification and the appended claims, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to monitoring, depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is monitored" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is monitored" or "in response to monitoring [described condition or event]", depending on the context.

[0165] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0166] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0167] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A lithium polymer battery power calibration method, characterized in that: The lithium polymer battery capacity calibration method comprises: In the charging state, collect the current charging voltage; Acquire a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship; The aging degree of the battery is calculated according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and the aging decay amount is matched based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process; Calculate the initial capacity of the lithium polymer battery according to the actual battery voltage; The actual power of the lithium polymer battery is calculated according to the initial power and the aging attenuation.

2. The lithium polymer battery capacity calibration method according to claim 1, characterized in that: The step of obtaining a mapping relationship between a charging voltage and an actual battery voltage, and matching the actual battery voltage corresponding to the current charging voltage according to the mapping relationship comprises: Input the current charging voltage into the following mapping relationship to obtain the actual battery voltage; The mapping relationship is: Among them, V b Indicates the actual battery voltage, V c represents the current charging voltage, I represents the current charging current, R i represents internal resistance, A represents a constant related to battery materials and chemical properties, T represents battery temperature, T0 represents reference temperature, n represents temperature influence index, V oc Represents the open circuit voltage of the battery, V max Indicates the maximum voltage of the battery.

3. The lithium polymer battery power calibration method according to claim 1, characterized in that: The step of calculating the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and matching the aging decay amount based on the aging degree includes: Inputting the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number into the first function to obtain the aging degree output by the first function; Input the aging degree into the following second function to obtain the aging attenuation output by the second function; The first function is: The second function is: D(A)=D0·A Among them, A represents the degree of aging, r int represents the internal resistance growth rate, r OCV Indicates the open circuit voltage drop rate, r DisV represents the discharge voltage decay rate, N represents the current battery cycle number, N0 represents the rated battery cycle number, σ represents the constant term, w1 represents the first weight coefficient, w2 represents the second weight coefficient, w3 represents the third weight coefficient, k represents the adjustment coefficient, D(A) represents the aging attenuation, and D0 represents the linear coefficient.

4. The lithium polymer battery capacity calibration method according to claim 1, characterized in that: The step of calculating the initial power of the lithium polymer battery according to the actual battery voltage comprises: Obtaining a relationship curve between battery voltage and power; the relationship curve is curve information pre-fitted based on multiple sets of battery voltages and power; In the relationship curve, the initial power corresponding to the actual battery voltage is extracted.

5. The lithium polymer battery capacity calibration method according to claim 1, characterized in that: The step of calculating the actual power of the lithium polymer battery according to the initial power and the aging attenuation comprises: Collect the current ambient temperature and calculate the power attenuation rate corresponding to the current ambient temperature; The actual power of the lithium polymer battery is calculated according to the initial power, the power attenuation rate and the aging attenuation.

6. The lithium polymer battery capacity calibration method according to claim 5, characterized in that: The step of collecting the current ambient temperature and calculating the power attenuation rate corresponding to the current ambient temperature includes: The current ambient temperature is collected, and the current ambient temperature is input into the temperature attenuation function to obtain the power attenuation rate of the lithium polymer battery output by the temperature attenuation function under the current ambient temperature; The temperature decay function is: Where D(T) represents the power attenuation rate at the current ambient temperature, E a represents the energy required for the battery chemical reaction, τ represents the Boltzmann constant, T represents the current ambient temperature, T0 represents the reference temperature, and ψ represents the empirical value.

7. The lithium polymer battery capacity calibration method according to claim 5, characterized in that: The step of calculating the actual power of the lithium polymer battery according to the initial power, the power attenuation rate and the aging attenuation comprises: Subtracting the initial power from the aging attenuation to obtain a first value; Multiplying the initial power by the power attenuation rate to obtain a second value; The first value is subtracted from the second value to obtain the actual power of the lithium polymer battery.

8. A lithium polymer battery power calibration device, characterized in that: The lithium polymer battery capacity calibration device comprises: A collection unit, used to collect the current charging voltage in the charging state; A matching unit, used to obtain a mapping relationship between a charging voltage and an actual battery voltage, and match the actual battery voltage corresponding to the current charging voltage according to the mapping relationship; A first calculation unit is used to calculate the aging degree of the battery according to the internal resistance growth rate, the open circuit voltage drop rate, the discharge voltage decay rate and the current battery cycle number, and match the aging decay amount based on the aging degree; the discharge voltage decay rate refers to the voltage decay rate during the discharge process; A second calculation unit, used for calculating the initial power of the lithium polymer battery according to the actual battery voltage; The third calculation unit is used to calculate the actual power of the lithium polymer battery according to the initial power and the aging attenuation.

9. A terminal device, characterized in that: The terminal device includes: a memory, a processor, and a lithium polymer battery power calibration program stored in the memory and executable on the processor, wherein the lithium polymer battery power calibration program is configured to implement the steps in the lithium polymer battery power calibration method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps in the lithium polymer battery capacity calibration method according to any one of claims 1 to 7 are implemented.

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