A battery charging intelligent monitoring method and system

Abstract

The present invention relates to the technical field of battery charging, and specifically to a method and system for intelligent monitoring of battery charging, including: obtaining the voltage and surface temperature at each moment in the battery charging process and the average temperature of the surface during the charging process under normal circumstances; obtaining the abnormal degree of temperature change in the corresponding period of each moment, the consistency degree of voltage change and temperature change in the corresponding period of each moment, and the degree of abnormal voltage performance according to the surface temperature and voltage at each moment in the corresponding period of each moment; finally, obtaining the health status of the battery according to the abnormal degree of voltage performance, the abnormal degree of temperature change, and the consistency degree of voltage change and temperature change in the corresponding period of each moment. The present invention judges the health status of the battery through the abnormal performance of voltage change and temperature change in the battery charging process, combined with the consistency of voltage and temperature change at each moment. The accuracy of the battery health status analysis results is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging, and in particular to a method and system for intelligently monitoring battery charging. Background Art

[0002] A battery is a device that can convert electrical energy into chemical energy and store it in the battery, and convert chemical energy into electrical energy for power supply when needed. Batteries not only play an indispensable role in portable electronic devices and electric vehicles, but also play an extremely important role in power outages and disasters. The loss and aging of batteries during use will reduce the safety of batteries, so the health status monitoring of batteries is particularly important during the use of batteries. Existing methods often use the deviation of temperature changes during battery charging to reflect the health status of batteries. However, due to the interference of other factors such as temperature, the temperature change often leads to inaccurate expression of the health status of the battery, which reduces the accuracy of the monitoring results during the battery charging process. Summary of the invention

[0003] The invention provides a battery charging intelligent monitoring method and system to solve the existing problems.

[0004] A battery charging intelligent monitoring method and system of the present invention adopts the following technical solutions:

[0005] An embodiment of the present invention provides a method for intelligently monitoring battery charging, the method comprising the following steps:

[0006] Obtain the voltage and surface temperature of the battery at each moment during each charging process, as well as the average surface temperature of the battery during normal charging;

[0007] The time period formed by each moment and the nearest previous moments of each moment is recorded as the corresponding time period of each moment, and the abnormal degree of temperature change in the corresponding time period of each moment is obtained according to the surface temperature and voltage of each moment in the corresponding time period of each moment;

[0008] Perform straight line fitting on all voltages and surface temperatures in the time period corresponding to each moment, respectively, to obtain a fitting straight line of the voltage and surface temperature in the time period corresponding to each moment, and obtain the degree of consistency between the voltage change and the temperature change in the time period corresponding to each moment according to the slope of the fitting straight line of the voltage and surface temperature in the time period corresponding to each moment;

[0009] According to the voltage at each moment and the time interval between each moment and the first moment, the degree of voltage rise at each moment is obtained; the first several moments adjacent to each moment are recorded as the reference moments corresponding to each moment, and according to the degree of voltage rise at each moment, the degree of voltage rise at each reference moment and the number of reference moments corresponding to each moment, the degree of voltage abnormality in the period corresponding to each moment is obtained;

[0010] The health status of the battery can be obtained based on the abnormal degree of voltage performance, the abnormal degree of temperature change, and the consistency between voltage change and temperature change in the corresponding period at each moment.

[0011] Furthermore, the specific calculation formula for obtaining the abnormal degree of temperature change in the time period corresponding to each moment according to the surface temperature and voltage at each moment in the time period corresponding to each moment is:

[0012]

[0013] in, Indicates The abnormal degree of temperature change in the corresponding period at each moment, Indicates The number of data in each second-order difference sequence in the period corresponding to each moment, Indicates The second-order difference sequence of the surface temperature at all moments in the corresponding period is data, Indicates The second-order difference sequence of the voltage at all moments in the time period corresponding to the moment data, represents the absolute value function, Indicates the average surface temperature of the battery during normal charging. Indicates The surface temperature at a given moment.

[0014] Furthermore, the specific calculation formula for obtaining the consistency between the voltage change and the temperature change in the time period corresponding to each moment according to the slope of the fitted straight line between the voltage and the surface temperature in the time period corresponding to each moment is:

[0015]

[0016] in, Indicates The consistency between the voltage change and the temperature change in the corresponding period at each moment, Indicates The slope of the fitting line of the voltage in the time period corresponding to each moment, Indicates The slope of the fitted straight line of the surface temperature in the corresponding period at each moment, Indicates The Pearson correlation coefficient of the voltage and surface temperature at all times in the corresponding period is, represents the absolute value function.

[0017] Furthermore, the step of obtaining the voltage rise degree at each moment according to the voltage at each moment and the time interval between each moment and the first moment includes the following specific steps:

[0018] The first The sum of all the data in the first-order difference sequence of the voltage at all times in the time period corresponding to the moment is recorded as The degree of voltage change in the corresponding time period at each moment;

[0019] The first The sum of all the data in the second-order difference sequence of the voltage at all times in the period corresponding to the moment is recorded as The voltage change difference in the corresponding time period at each moment;

[0020] The voltage rise degree at each moment is obtained according to the voltage change degree in the time period corresponding to each moment, the voltage change difference and the time interval between each moment and the first moment.

[0021] Furthermore, the specific calculation formula for obtaining the voltage rise degree at each moment according to the voltage change degree in the time period corresponding to each moment, the voltage change difference, and the time interval between each moment and the first moment is:

[0022]

[0023] in, Indicates The voltage rise at a certain moment, Indicates The voltage change degree in the corresponding time period at each moment is Indicates The voltage change difference in the corresponding time period at each moment is Indicates The time interval between the first moment and the second moment, represents the linear normalization function.

[0024] Furthermore, the degree of abnormal voltage performance in the time period corresponding to each moment is obtained according to the rising degree of voltage at each moment, the rising degree of voltage at each reference moment, and the number of reference moments corresponding to each moment, and the specific steps include the following:

[0025] The first The voltage rise degree of all reference moments corresponding to the first moment is The average of the absolute values ​​of the differences in the voltage rise at each moment is recorded as The difference between the voltage rise degree at a certain moment and the corresponding reference moment;

[0026] The first The voltage rise at the moment and the The normalized value of the product of the difference between the voltage rise degree at the first moment and the corresponding reference moment is recorded as The possibility of being in the constant current charging stage at a certain moment;

[0027] Subtract 1 from The value of the probability that the moment belongs to the constant current charging stage is recorded as The possibility of being in the constant voltage charging stage at a certain moment;

[0028] The first The sum of the absolute values ​​of all data in the second-order difference sequence of the voltage at all times in the period corresponding to the moment is recorded as The difference in voltage change speed at adjacent moments in the corresponding period of time;

[0029] The first The difference in voltage change speed at adjacent moments in the period corresponding to the moment is The ratio of the absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is recorded as The voltage abnormality level of the constant current charging stage in the corresponding period at each moment;

[0030] The first The sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all times in the period corresponding to the moment is equal to the sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all times in the period corresponding to the moment The ratio of the absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is recorded as The voltage abnormality level of the constant voltage charging stage in the corresponding period at each moment;

[0031] According to the possibility of being in the constant current charging stage at each moment, the possibility of being in the constant voltage charging stage at each moment, the degree of voltage abnormality in the constant current charging stage in the time period corresponding to each moment, and the degree of voltage abnormality in the constant voltage charging stage, the degree of voltage abnormality in the time period corresponding to each moment is obtained.

[0032] Further, according to the possibility of being in the constant current charging stage at each moment, the possibility of being in the constant voltage charging stage at each moment, the voltage abnormality degree of the constant current charging stage in the corresponding time period at each moment, and the voltage abnormality degree of the constant voltage charging stage, the specific calculation formula for obtaining the degree of voltage abnormality in the corresponding time period at each moment is:

[0033]

[0034] in, Indicates The degree of abnormal voltage performance in the corresponding period at each moment, Indicates The possibility of being in the constant current charging stage at a certain moment, Indicates The voltage abnormality degree of the constant current charging stage in the corresponding period at each moment, Indicates The possibility of being in the constant voltage charging stage at a certain moment, For the The voltage abnormality degree in the constant voltage charging stage is shown in the corresponding period at each moment.

[0035] Furthermore, the health status of the battery is obtained according to the abnormal degree of voltage performance, the abnormal degree of temperature change and the consistency degree between voltage change and temperature change in the corresponding time period at each moment, and the specific steps include the following:

[0036] According to the abnormal degree of voltage performance in the corresponding period at each moment, the abnormal degree of temperature change and the consistency between voltage change and temperature change, the abnormal degree of the battery at each moment is obtained;

[0037] The reciprocal of the sum of the abnormality levels of the battery at all times is recorded as the health condition of the battery during the charging process.

[0038] Furthermore, according to the abnormal degree of voltage performance, the abnormal degree of temperature change and the consistency between voltage change and temperature change in the corresponding period at each moment, the specific calculation formula for the abnormal degree of the battery at each moment is obtained as follows:

[0039]

[0040] in, Indicates The abnormality of the battery at a certain moment, Indicates The consistency between the voltage change and the temperature change in the corresponding period at each moment, Indicates The abnormal degree of temperature change in the corresponding period at each moment, Indicates The degree of abnormal voltage performance in the corresponding period at each moment.

[0041] The present invention also proposes a battery charging intelligent monitoring system, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the aforementioned battery charging intelligent monitoring method.

[0042] The beneficial effects of the technical solution of the present invention are:

[0043] In the embodiment of the present invention, the voltage and surface temperature of the battery at each moment in each charging process and the average surface temperature of the battery during normal charging are obtained; the time period consisting of each moment and the previous several moments closest to each moment is recorded as the corresponding time period of each moment, and the abnormal degree of temperature change in the corresponding time period of each moment is obtained according to the surface temperature and voltage of each moment in the corresponding time period of each moment; it can timely discover abnormal temperature fluctuations according to real-time monitoring of the temperature change of the battery in each time period during the charging process, and the life of the battery is closely related to its working temperature and charging state. By calculating the abnormal degree of temperature change in the corresponding time period of each moment, the performance degradation and shortened life of the battery caused by overheating or overcooling can be avoided. Straight line fitting is performed on all voltages and surface temperatures in the corresponding time period of each moment respectively, and the fitting straight line of voltage and surface temperature in the corresponding time period of each moment is obtained. According to the slope of the fitting straight line of voltage and surface temperature in the corresponding time period of each moment, the consistency degree of voltage change and temperature change in the corresponding time period of each moment is obtained; according to the analysis of the fitting straight line, the slope of the fitting straight line is used as a quantitative index, which can facilitate data analysis and comparison and help to extract useful information from a large amount of data. According to the voltage at each moment and the time interval between each moment and the first moment, the degree of voltage rise at each moment is obtained; the first several moments adjacent to each moment are recorded as the reference moments corresponding to each moment, and the degree of voltage abnormality in the corresponding time period of each moment is obtained according to the degree of voltage rise at each moment, the degree of voltage rise at each reference moment, and the number of reference moments corresponding to each moment; the accuracy of the battery health status analysis result is improved by calculating the degree of voltage abnormality in the corresponding time period of each moment based on the voltage data at each moment and the degree of voltage rise at the reference moment. The health status of the battery is obtained according to the degree of voltage abnormality in the corresponding time period of each moment, the degree of temperature abnormality, and the consistency between voltage change and temperature change. So far, the present invention calculates the abnormal situation of the battery at each moment through the abnormal performance of voltage change and temperature change during the battery charging process, combined with the consistency of voltage and temperature change at each moment, and judges the health status of the battery according to the abnormal situation of the battery at each moment during the charging process. It can avoid interference from other factors when judging the health status of the battery only from the abnormal temperature of the battery, and effectively improves the accuracy of the battery health status analysis result. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0045] Figure 1 A flowchart of the steps of a battery charging intelligent monitoring method of the present invention;

[0046] Figure 2 3 is a curve diagram showing the variation of the voltage rise degree in this embodiment. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a battery charging intelligent monitoring method and system proposed by the present invention, its specific implementation, structure, features and effects, in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0048] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0049] The specific scheme of a battery charging intelligent monitoring method and system provided by the present invention is described in detail below with reference to the accompanying drawings.

[0050] See also Figure 1 , which shows a flowchart of a method for intelligent monitoring of battery charging provided by an embodiment of the present invention, the method comprising the following steps:

[0051] Step S001: Obtain the voltage and surface temperature of the battery at each moment during each charging process and the average surface temperature of the battery during normal charging.

[0052] Obtain the voltage and surface temperature of the battery at each moment during each charging process, as well as the average surface temperature of the battery during charging under normal conditions.

[0053] It should be noted that the collection frequency is once per minute, and this is used as an example for description.

[0054] Step S002: Record the time period consisting of each moment and the previous several moments closest to each moment as the corresponding time period of each moment, and obtain the abnormal degree of temperature change in the corresponding time period of each moment according to the surface temperature and voltage at each moment in the corresponding time period of each moment.

[0055] Under normal circumstances, during the battery charging process, the voltage will continue to increase at first. When the power reaches a certain value, the rate of voltage increase will begin to slow down until it reaches the rated voltage. The voltage begins to remain constant, so the corresponding battery temperature will rise faster at first, and the rate of increase will increase with the increase of voltage. When the voltage begins to remain constant, the rate of increase of battery temperature will gradually decrease.

[0056] Compare each moment to the nearest previous moment The time period is composed of moments, and the time period corresponding to each moment is recorded.

[0057] It should be noted that: the preset quantity threshold in this embodiment The value is 10, and this example is used for description.

[0058] The second-order difference series of voltage and surface temperature at all times in the period corresponding to each moment are obtained respectively.

[0059] First For example, the moment The calculation formula for the abnormal degree of temperature change in the corresponding period at a moment is:

[0060]

[0061] in, Indicates The abnormal degree of temperature change in the corresponding period at each moment, Indicates The number of data in each second-order difference sequence in the period corresponding to each moment, Indicates The second-order difference sequence of the surface temperature at all moments in the corresponding period is data, Indicates The second-order difference sequence of the voltage at all moments in the time period corresponding to the moment data, represents the absolute value function. Indicates the average surface temperature of the battery during normal charging. Indicates The surface temperature at a given moment.

[0062] What needs to be explained is: Indicates The second-order difference sequence of voltage and surface temperature at all times in the corresponding period is The value is positive under normal circumstances, and negative when the surface temperature changes abnormally. Indicates the average surface temperature of the battery during charging under normal conditions. The difference in surface temperature at each moment.

[0063] Step S003: Perform straight-line fitting on all voltages and surface temperatures in the time period corresponding to each moment, respectively, to obtain a fitted straight line of the voltage and surface temperature in the time period corresponding to each moment, and obtain the degree of consistency between the voltage change and the temperature change in the time period corresponding to each moment according to the slope of the fitted straight line of the voltage and surface temperature in the time period corresponding to each moment.

[0064] When the surface temperature change of the battery during charging is caused by the heat release of the charging reaction, the surface temperature of the battery will gradually rise during charging, and the speed of temperature change is consistent with the change of voltage. When the voltage increases, the temperature rise rate increases, and when the voltage is maintained, the temperature rise rate decreases.

[0065] Therefore, the consistency between the battery voltage change and the surface temperature change during the charging process can be used to determine whether the change in the battery surface temperature is caused by the voltage change or the temperature condition. The consistency between the voltage change and the temperature change in the corresponding period at each moment can be determined based on the voltage and temperature rise rate in the corresponding period at each moment.

[0066] The least square method is used to perform straight-line fitting on all voltages and surface temperatures in the time period corresponding to each moment, and a fitting straight line of the voltage and surface temperature in the time period corresponding to each moment is obtained.

[0067] It should be noted that the least square method is a well-known technology and the specific method will not be introduced here.

[0068] First For example, the moment The calculation formula for the consistency between voltage change and temperature change in the corresponding period at a moment is:

[0069]

[0070] in, Indicates The consistency between the voltage change and the temperature change in the corresponding period at each moment, Indicates The slope of the fitting line of the voltage in the time period corresponding to each moment, Indicates The slope of the fitted straight line of the surface temperature in the corresponding period at each moment, Indicates The Pearson correlation coefficient of the voltage and surface temperature at all times in the corresponding period is, represents the absolute value function.

[0071] What needs to be explained is: Indicates The difference between the voltage change and the surface temperature change in the corresponding time period at each moment. The Pearson correlation coefficient is a well-known technology, and the specific method is not introduced here.

[0072] Step S004: According to the voltage at each moment and the time interval between each moment and the first moment, the degree of voltage rise at each moment is obtained; the first several moments adjacent to each moment are recorded as reference moments corresponding to each moment, and according to the degree of voltage rise at each moment, the degree of voltage rise at each reference moment and the number of reference moments corresponding to each moment, the degree of abnormal voltage performance in the time period corresponding to each moment is obtained.

[0073] Under normal circumstances, the voltage of the battery during charging should gradually rise in the constant current charging stage, and the rising speed should steadily decrease until it reaches the rated voltage, and then enter the constant voltage charging stage to keep the voltage unchanged. When an abnormality occurs during the battery charging process, it may cause the voltage to suddenly increase or decrease, or the voltage to fluctuate repeatedly.

[0074] When the charging process is in the constant current charging stage, the voltage rises to a large extent and the rising speed changes steadily.

[0075] Obtain the first-order difference sequence of the voltage at all times in the period corresponding to each time moment.

[0076] The first The sum of all the data in the first-order difference sequence of the voltage at all times in the time period corresponding to the moment is recorded as The voltage change degree in the corresponding time period at each moment.

[0077] The first The sum of all the data in the second-order difference sequence of the voltage at all times in the period corresponding to the moment is recorded as The voltage change difference within the corresponding time period at each moment.

[0078] First For example, the moment The calculation formula for the voltage rise at a certain moment is:

[0079]

[0080] in, Indicates The voltage rise at a certain moment, Indicates The voltage change degree in the corresponding time period at each moment is Indicates The voltage change difference in the corresponding time period at each moment is Indicates The time interval between the first moment and the represents the linear normalization function.

[0081] As the battery is charging, the degree of voltage rise gradually decreases until it reaches the constant voltage stage, and the voltage rise is reduced to the minimum.

[0082] According to the voltage rise degree at each moment, a curve of the voltage rise degree is constructed, such as Figure 2 shown.

[0083] What needs to be explained is: Figure 2 : is a curve diagram showing the change of the voltage rise degree in this embodiment, wherein the horizontal axis represents time and the vertical axis represents the voltage rise degree.

[0084] According to the change curve of the voltage rise degree The changing relationship between the voltage rise degree at each moment is used to calculate the possibility of being in the constant current charging stage at that moment.

[0085] Will be with The previous moment The moment is recorded as The reference time corresponding to a moment.

[0086] It should be noted that: the preset quantity threshold in this embodiment is 10, and we will take this as an example. If there are less than 10 adjacent moments, the actual number will be used for analysis.

[0087] First For example, the moment The calculation formula for the difference between the voltage rise degree at a certain moment and the corresponding reference moment is:

[0088]

[0089] in, Indicates The difference between the voltage rise degree at a certain moment and the corresponding reference moment, Indicates The voltage rise at a certain moment, Indicates The moment corresponding to The voltage rise at a reference moment, Indicates The number of reference moments corresponding to a moment, represents the absolute value function.

[0090] The first The voltage rise at the moment and the The normalized value of the product of the difference between the voltage rise degree at the first moment and the corresponding reference moment is recorded as The probability of being in the constant current charging stage at a certain moment. Among them, the normalized value uses a linear normalization function Get.

[0091] Subtract 1 from The value of the probability that the moment belongs to the constant current charging stage is recorded as The possibility of being in the constant voltage charging stage at a certain moment.

[0092] In the constant current charging stage, the voltage is in a stable increasing stage, that is, the voltage growth rate changes little. When the voltage changes abnormally, the voltage change rate will also increase. Therefore, the voltage abnormality degree of the constant current charging stage in the corresponding period at each moment can be obtained.

[0093] The first The sum of the absolute values ​​of all data in the second-order difference sequence of the voltage at all times in the period corresponding to the moment is recorded as The difference in voltage change speed between adjacent moments in the corresponding period.

[0094] Calculate the The absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is The difference in voltage change speed at adjacent moments in the period corresponding to the moment is The ratio of the absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is recorded as The voltage abnormality degree in the constant current charging stage is shown in the corresponding time period at each moment.

[0095] During the constant voltage charging stage, the voltage remains constant, so the greater the voltage change in the corresponding time period at each moment, the greater the abnormality of the voltage in that time period.

[0096] Calculate the The sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all moments in the period corresponding to the moment The sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all times in the period corresponding to the moment is equal to the sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all times in the period corresponding to the moment The ratio of the absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is recorded as The voltage abnormality degree in the constant voltage charging stage is shown in the corresponding period at each moment.

[0097] According to The probability of being in the constant current charging stage and the constant voltage charging stage at a certain moment, as well as the voltage abnormality degree of the constant current charging stage and the voltage abnormality degree of the constant voltage charging stage in the corresponding period, can be calculated. The degree of abnormal voltage performance in the corresponding time period at each moment.

[0098] First For example, the moment The calculation formula for the degree of abnormal voltage performance in the corresponding period at a moment is:

[0099]

[0100] in, Indicates The degree of abnormal voltage performance in the corresponding period at each moment, Indicates The possibility of being in the constant current charging stage at a certain moment, Indicates The voltage abnormality degree of the constant current charging stage in the corresponding period at each moment, Indicates The possibility of being in the constant voltage charging stage at a certain moment, For the The voltage abnormality degree in the constant voltage charging stage is shown in the corresponding period at each moment.

[0101] Step S005: The health status of the battery is obtained according to the abnormal degree of voltage performance, the abnormal degree of temperature change and the consistency degree between voltage change and temperature change in the corresponding time period at each moment.

[0102] The abnormal change of surface temperature during battery charging may be affected by abnormal voltage or other environmental factors. When the consistency between surface temperature change and voltage change is high, the abnormal surface temperature can reflect the health of the battery. When the consistency between surface temperature and voltage change is low, the abnormal surface temperature may be affected by other factors, so its response to the health of the battery is low. Therefore, the health of the battery should be reflected based on the abnormal voltage.

[0103] First For example, the moment The calculation formula for the abnormality degree of the battery at a certain moment is:

[0104]

[0105] in, Indicates The abnormality of the battery at a certain moment, Indicates The consistency between the voltage change and the temperature change in the corresponding period at each moment, Indicates The abnormal degree of temperature change in the corresponding period at each moment, Indicates The degree of abnormal voltage performance in the corresponding period at each moment.

[0106] According to the abnormal performance degree of the battery at each moment, the abnormal condition of the battery during the entire charging process can be judged, and then the health condition of the battery during the charging process can be calculated.

[0107] The reciprocal of the sum of the abnormality levels of the battery at all times is recorded as the health condition of the battery during the charging process.

[0108] It should be noted that the smaller the sum of the abnormality levels of the battery at all times is, the better the health of the battery is. In this embodiment, when the denominator in the formula is 0, the denominator is set to 1, and this example is used for description to ensure that the formula is valid.

[0109] So far, the present invention is completed.

[0110] In summary, in the embodiment of the present invention, the voltage and surface temperature of the battery at each moment in each charging process and the average surface temperature of the battery during normal charging are obtained; the time period consisting of each moment and the previous several moments closest to each moment is recorded as the corresponding time period of each moment, and the abnormal degree of temperature change in the corresponding time period of each moment is obtained according to the surface temperature and voltage at each moment in the corresponding time period of each moment; straight-line fitting is performed on all voltages and surface temperatures in the corresponding time period of each moment respectively, and a fitting straight line of voltage and surface temperature in the corresponding time period of each moment is obtained, and a fitting straight line of voltage and surface temperature in the corresponding time period of each moment is obtained according to the fitting straight line of voltage and surface temperature in the corresponding time period of each moment. The slope of the line is used to obtain the consistency between the voltage change and the temperature change in the time period corresponding to each moment; the rise degree of the voltage at each moment is obtained according to the voltage at each moment and the time interval between each moment and the first moment; the first several moments adjacent to each moment are recorded as the reference moment corresponding to each moment, and the degree of abnormal voltage performance in the time period corresponding to each moment is obtained according to the rise degree of the voltage at each moment, the rise degree of the voltage at each reference moment, and the number of reference moments corresponding to each moment; the health status of the battery is obtained according to the degree of abnormal voltage performance in the time period corresponding to each moment, the abnormal degree of temperature change, and the consistency between the voltage change and the temperature change. The present invention judges the health status of the battery through the abnormal performance of the voltage change and the temperature change during the battery charging process, combined with the consistency of the voltage and temperature change at each moment. The accuracy of the battery health status analysis results is effectively improved.

[0111] The present invention also provides a battery charging intelligent monitoring system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the aforementioned battery charging intelligent monitoring method.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery charging intelligent monitoring method, characterized in that: The method comprises the following steps: Obtain the voltage and surface temperature of the battery at each moment during each charging process, as well as the average surface temperature of the battery during normal charging; The time period formed by each moment and the nearest previous moments of each moment is recorded as the corresponding time period of each moment, and the abnormal degree of temperature change in the corresponding time period of each moment is obtained according to the surface temperature and voltage of each moment in the corresponding time period of each moment; Perform straight line fitting on all voltages and surface temperatures in the time period corresponding to each moment, respectively, to obtain a fitting straight line of the voltage and surface temperature in the time period corresponding to each moment, and obtain the degree of consistency between the voltage change and the temperature change in the time period corresponding to each moment according to the slope of the fitting straight line of the voltage and surface temperature in the time period corresponding to each moment; According to the voltage at each moment and the time interval between each moment and the first moment, the degree of voltage rise at each moment is obtained; the first several moments adjacent to each moment are recorded as the reference moments corresponding to each moment, and according to the degree of voltage rise at each moment, the degree of voltage rise at each reference moment and the number of reference moments corresponding to each moment, the degree of voltage abnormality in the period corresponding to each moment is obtained; The health status of the battery is obtained based on the abnormal degree of voltage performance, the abnormal degree of temperature change, and the consistency between voltage change and temperature change in the corresponding period at each moment; The specific calculation formula for obtaining the abnormal degree of temperature change in the time period corresponding to each moment according to the surface temperature and voltage at each moment in the time period corresponding to each moment is: in, Indicates The abnormal degree of temperature change in the corresponding period at each moment, Indicates The number of data in each second-order difference sequence in the period corresponding to each moment, Indicates The second-order difference sequence of the surface temperature at all moments in the corresponding period is data, Indicates The second-order difference sequence of the voltage at all moments in the time period corresponding to the moment data, represents the absolute value function, Indicates the average surface temperature of the battery during normal charging. Indicates The surface temperature at a given moment; The specific calculation formula for obtaining the consistency between the voltage change and the temperature change in the time period corresponding to each moment according to the slope of the fitting straight line between the voltage and the surface temperature in the time period corresponding to each moment is: in, Indicates The consistency between the voltage change and the temperature change in the corresponding period at each moment, Indicates The slope of the fitting line of the voltage in the time period corresponding to each moment, Indicates The slope of the fitted straight line of the surface temperature in the corresponding period at each moment, Indicates The Pearson correlation coefficient of the voltage and surface temperature at all times in the corresponding period is, represents the absolute value function.

2. A battery charging intelligent monitoring method according to claim 1, characterized in that: The step of obtaining the voltage rise degree at each moment according to the voltage at each moment and the time interval between each moment and the first moment includes the following specific steps: The first The sum of all the data in the first-order difference sequence of the voltage at all times in the time period corresponding to the moment is recorded as The degree of voltage change in the corresponding time period at each moment; The first The sum of all the data in the second-order difference sequence of the voltage at all times in the period corresponding to the moment is recorded as The voltage change difference in the corresponding time period at each moment; The voltage rise degree at each moment is obtained according to the voltage change degree in the time period corresponding to each moment, the voltage change difference and the time interval between each moment and the first moment.

3. A battery charging intelligent monitoring method according to claim 2, characterized in that: The specific calculation formula for obtaining the voltage rise degree at each moment according to the voltage change degree in the period corresponding to each moment, the voltage change difference, and the time interval between each moment and the first moment is: in, Indicates The voltage rise at a certain moment, Indicates The voltage change degree in the corresponding time period at each moment is Indicates The voltage change difference in the corresponding time period at each moment is Indicates The time interval between the first moment and the second moment, represents the linear normalization function.

4. A battery charging intelligent monitoring method according to claim 1, characterized in that: The method of obtaining the abnormality of the voltage in the period corresponding to each moment according to the rising degree of the voltage at each moment, the rising degree of the voltage at each reference moment, and the number of reference moments corresponding to each moment includes the following specific steps: The first The voltage rise degree of all reference moments corresponding to the first moment is The average of the absolute values ​​of the differences in the voltage rise at each moment is recorded as The difference between the voltage rise degree at a certain moment and the corresponding reference moment; The first The voltage rise at the moment and the The normalized value of the product of the difference between the voltage rise degree at the first moment and the corresponding reference moment is recorded as The possibility of being in the constant current charging stage at a certain moment; Subtract 1 from The probability value of the moment belonging to the constant current charging stage is recorded as The possibility of being in the constant voltage charging stage at a certain moment; The first The sum of the absolute values ​​of all data in the second-order difference sequence of the voltage at all times in the period corresponding to the moment is recorded as The difference in voltage change speed at adjacent moments in the corresponding period of time; The first The difference in voltage change speed at adjacent moments in the period corresponding to the moment is The ratio of the absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is recorded as The voltage abnormality level of the constant current charging stage in the corresponding period at each moment; The first The sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all times in the period corresponding to the moment is equal to the sum of the absolute values ​​of all data in the first-order difference sequence of the voltage at all times in the period corresponding to the moment The ratio of the absolute value of the difference between the voltage at the last moment and the voltage at the first moment in the corresponding period is recorded as The voltage abnormality level of the constant voltage charging stage in the corresponding period at each moment; According to the possibility of being in the constant current charging stage at each moment, the possibility of being in the constant voltage charging stage at each moment, the degree of voltage abnormality in the constant current charging stage in the time period corresponding to each moment, and the degree of voltage abnormality in the constant voltage charging stage, the degree of voltage abnormality in the time period corresponding to each moment is obtained.

5. A battery charging intelligent monitoring method according to claim 4, characterized in that: According to the possibility of being in the constant current charging stage at each moment, the possibility of being in the constant voltage charging stage at each moment, the voltage abnormality degree of the constant current charging stage in the time period corresponding to each moment, and the voltage abnormality degree of the constant voltage charging stage, the specific calculation formula for obtaining the voltage abnormality degree in the time period corresponding to each moment is: in, Indicates The degree of abnormal voltage performance in the corresponding period at each moment, Indicates The possibility of being in the constant current charging stage at a certain moment, Indicates The voltage abnormality degree of the constant current charging stage in the corresponding period at each moment, Indicates The possibility of being in the constant voltage charging stage at a certain moment, For the The voltage abnormality degree in the constant voltage charging stage is shown in the corresponding period at each moment.

6. A battery charging intelligent monitoring method according to claim 1, characterized in that: The method of obtaining the health status of the battery according to the abnormal degree of voltage performance, the abnormal degree of temperature change and the consistency degree between the voltage change and the temperature change in the corresponding time period at each moment includes the following specific steps: According to the abnormal degree of voltage performance in the corresponding period at each moment, the abnormal degree of temperature change and the consistency between voltage change and temperature change, the abnormal degree of the battery at each moment is obtained; The reciprocal of the sum of the abnormality levels of the battery at all times is recorded as the health condition of the battery during the charging process.

7. A battery charging intelligent monitoring method according to claim 6, characterized in that: The specific calculation formula for the abnormality of the battery at each moment is obtained based on the abnormality of the voltage in the corresponding period at each moment, the abnormality of the temperature change, and the consistency between the voltage change and the temperature change: in, Indicates The abnormality of the battery at a certain moment, Indicates The consistency between the voltage change and the temperature change in the corresponding period at each moment, Indicates The abnormal degree of temperature change in the corresponding period at each moment, Indicates The degree of abnormal voltage performance in the corresponding period at each moment.

8. A battery charging intelligent monitoring system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is executed by a processor, the steps of a battery charging intelligent monitoring method as described in any one of claims 1 to 7 are implemented.

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