Battery charging safety warning method, electronic device and storage medium

Abstract

The present application discloses a battery charging safety warning method, device, and storage medium. The battery charging safety warning method of the present application includes obtaining the operating status and operating data at the current moment and the last preset moment; if the operating status at the current moment is charging, obtaining a first difference; if the first difference is less than a preset current jump threshold, obtaining a preset number of cached calculations as the cumulative number of calculations of the battery internal resistance; determining the internal resistance to be analyzed based on the first comparison result based on the cumulative number of calculations; determining the open circuit voltage of the battery based on the internal resistance to be analyzed; determining the interval number based on the open circuit voltage, and performing a warning analysis on the interval number. The present application only requires the operating status and operating data to complete the warning analysis of the battery system, which improves the timeliness of the warning and can quickly feedback potential safety hazards of single cells; in addition, the data storage unit only needs to cache the data in the calculation process, without caching the source data, and has low requirements for computing power resources.

Description

Technical Field

[0001] The present application relates to the field of battery system charging safety assessment, and in particular to a battery charging safety early warning method, electronic equipment, and storage medium. Background Art

[0002] In recent years, battery system fires caused by thermal runaway during charging have become increasingly common. Therefore, providing safety warnings for battery systems during charging is crucial. Currently, online safety diagnostics for battery systems use alarms based on cell voltage differences, but this approach lacks safety warning capabilities. Another approach utilizes cloud-based monitoring for safety warnings, but this approach lacks timely warnings and lacks rapid feedback on battery system issues. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery charging safety warning method that can provide a safety warning for the battery system, improve the timeliness of the warning, and quickly feedback the problems of the battery system.

[0004] According to the first aspect of the present application, the battery charging safety warning method includes: obtaining the operating status and operating data of the battery system at the current moment and the previous preset moment, the operating data including: total voltage, total current, and single cell voltage; if the operating status at the current moment is charging, obtaining the difference between the total current at the current moment and the previous preset moment to obtain a first difference; if the first difference is less than the preset current jump threshold, obtaining the preset number of calculations stored in the cache of the processor data storage unit as the cumulative number of calculations of the battery internal resistance; comparing the cumulative number of calculations with the preset threshold number to obtain a first comparison result, and determining the internal resistance to be analyzed based on the first comparison result, the cached battery internal resistance, and the default battery internal resistance; determining the open circuit voltage, average open circuit voltage, and open circuit voltage difference of the battery based on the internal resistance to be analyzed, the total current, and the total voltage; determining the interval number based on the open circuit voltage and a preset relationship table, and performing warning analysis based on the interval number to output a normal cell signal or an abnormal cell signal; wherein the preset relationship table includes the correspondence between the open circuit voltage and the interval number.

[0005] The battery charging safety warning method according to the embodiment of the present application has at least the following beneficial effects: through the operating status and operating data of the battery system at the current moment and the previous preset moment, a normal cell signal or an abnormal cell signal is output after calculation and analysis. Only the operating status and operating data are needed to complete the warning analysis of the battery system, which improves the timeliness of the warning and can quickly feedback the potential safety hazards of the single cell battery; in addition, the processor data storage unit only needs to cache the data in the calculation process, without caching the source data, and has low demand on computing power resources.

[0006] According to some embodiments of the present application, it also includes: if the first difference is greater than or equal to the preset current jump threshold, obtaining the preset number of calculations stored in the processor data storage unit cache, and adding the current step number as the cumulative number of calculations of the battery internal resistance.

[0007] According to some embodiments of the present application, it also includes: defining the total current and the total voltage at the current moment and the previous preset moment as a first current value, a second current value, a first voltage value, and a second voltage value, respectively; calculating multiple single-cell internal resistances based on the first current value, the second current value, the first voltage value, and the second voltage value; wherein the single-cell internal resistance and the average internal resistance are stored in the processor data storage unit cache for calculation of the next charging cycle.

[0008] According to some embodiments of the present application, the cumulative number of calculations is compared with a preset threshold number of times to obtain a first comparison result, and the internal resistance to be analyzed is determined based on the first comparison result, the cached battery internal resistance, and the default battery internal resistance, including: if the first comparison result is that the cumulative number of calculations is greater than the preset threshold number of times, then the cached battery internal resistance is obtained as the internal resistance to be analyzed; if the first comparison result is that the cumulative number of calculations is less than or equal to the preset threshold number, then the default battery internal resistance is obtained as the internal resistance to be analyzed.

[0009] According to some embodiments of the present application, the interval number is determined according to the open circuit voltage and the preset relationship table, and an early warning analysis is performed according to the interval number to output a normal cell signal or an abnormal cell signal, including: obtaining a first interval number corresponding to the open circuit voltage at the current moment and a second interval number corresponding to the open circuit voltage at the previous preset moment according to the open circuit voltage and the preset relationship table; comparing the first interval number and the second interval number to obtain a second comparison result; and performing an early warning analysis according to the second comparison result to output a normal cell signal or an abnormal cell signal.

[0010] According to some embodiments of the present application, the early warning analysis is performed based on the second comparison result to output a normal cell signal or an abnormal cell signal, including: if the second comparison result is that the first interval number and the second interval number are in the same interval, then the number of calculations of the open circuit voltage difference is increased to obtain the sum of the average open circuit voltages in the preset interval, and the normal cell signal is output; wherein the preset interval is the interval where the first interval number is located; if the second comparison result is that the first interval number and the second interval number are in different intervals, then the early warning value of the interval where the second interval number is located is determined based on the cache early warning threshold in the processor data storage unit and the open circuit voltage difference at the current moment, the early warning threshold is updated, and the number of calculations is cleared; the early warning value is compared with a preset reference value to obtain a third comparison result, and the normal cell signal or the abnormal cell signal is output based on the third comparison result.

[0011] According to some embodiments of the present application, the warning value is compared with a preset reference value to obtain a third comparison result, and the battery cell normal signal or the battery cell abnormal signal is output according to the third comparison result, including: if the third comparison result is that the warning value is less than or equal to the preset reference value, then the battery cell normal signal is output; if the third comparison result is that the warning value is greater than the preset reference value, then the battery cell abnormal signal is output.

[0012] According to the electronic device of the second aspect embodiment of the present application, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the battery charging safety warning method of the first aspect embodiment of the present application.

[0013] The electronic device according to the embodiment of the present application has at least the following beneficial effects: by executing the above-mentioned battery charging safety warning method, the timeliness of the warning can be improved, and the potential safety hazards of the single battery can be quickly fed back; in addition, the processor data storage unit only needs to cache the data in the calculation process, and does not need to cache the source data, thereby reducing the demand for computing power resources.

[0014] According to the computer-readable storage medium of the third aspect embodiment of the present application, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to execute the battery charging safety warning method of the above-mentioned first aspect embodiment of the present application.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a flowchart of a battery charging safety warning method according to an embodiment of the present application;

[0018] Figure 2 This is another flowchart of the battery charging safety warning method according to an embodiment of the present application;

[0019] Figure 3 This is another flowchart of the battery charging safety warning method according to an embodiment of the present application;

[0020] Figure 4 for Figure 1 Specific flow diagram of step S400;

[0021] Figure 5 for Figure 1 Specific flow diagram of step S600;

[0022] Figure 6 for Figure 5 Specific flow diagram of step S630;

[0023] Figure 7 for Figure 6 Specific flow diagram of step S632;

[0024] Figure 8 This is a schematic diagram of the specific process of the battery charging safety warning method according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0026] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0027] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0029] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0030] The technical solution of this application is described below with reference to specific embodiments.

[0031] In a first aspect, the present application provides a battery charging safety early warning method.

[0032] like Figure 1 As shown, the battery charging safety warning method according to an embodiment of the present application includes:

[0033] Step S100: Acquire the operating status and operating data of the battery system at the current moment and the last preset moment, the operating data including: total voltage, total current, and single cell voltage;

[0034] Step S200: If the current operating state is charging, obtain the absolute value of the difference between the total current at the current moment and the total current at the last preset moment to obtain a first difference;

[0035] Step S300: if the first difference is less than the preset current jump threshold, obtaining the preset number of calculations stored in the cache of the processor data storage unit as the cumulative number of calculations of the battery internal resistance;

[0036] Step S400: Compare the accumulated calculation times with a preset threshold number to obtain a first comparison result, and determine the internal resistance to be analyzed based on the first comparison result, the cached battery internal resistance, and the default battery internal resistance;

[0037] Step S500: determining the open circuit voltage, average open circuit voltage and open circuit voltage difference of the battery according to the internal resistance to be analyzed, the total current and the total voltage;

[0038] Step S600: determining the interval number according to the open circuit voltage and the preset relationship table, and performing early warning analysis according to the interval number to output a normal cell signal or an abnormal cell signal.

[0039] According to the battery charging safety early warning method of the embodiment of the present application, the operating status and operating data of the battery system at the current moment and the previous preset moment are calculated and analyzed, and a normal cell signal or an abnormal cell signal is output. Only the operating status and operating data are needed to complete the early warning analysis of the battery system, which improves the timeliness of the early warning and can quickly feedback the potential safety hazards of the single cell battery; in addition, the processor data storage unit only needs to cache the data in the calculation process, without caching the source data, and has low requirements for computing power resources.

[0040] Specifically, the power charging safety warning method is executed by the edge computing system. The battery management system actively collects relevant data from the battery system and transmits it to the edge computing system via hardware communication. The edge computing system then performs a warning analysis on battery charging safety. After obtaining the operating status and operating data of the battery system at the current moment and the previous preset moment, a charging or discharging safety warning analysis is performed on each single cell of the battery system based on the operating status. The battery system operating data includes total voltage, total current, single cell voltage, and the number of single cells in the battery system.

[0041] If the current operating state is charging, the absolute value of the difference between the total current at the current moment and the total current at the previous preset moment is obtained to obtain a first difference. The cumulative number of calculations of the battery internal resistance is determined by comparing the first difference with the preset current jump threshold. When the first difference is less than the preset current jump threshold, it means that the charging current at the current moment has jumped, and the preset number of calculations cached in the processor data storage unit is obtained as the cumulative number of calculations of the battery internal resistance. Among them, the preset current jump threshold can be set according to needs due to different application scenarios. Then, based on the cumulative number of calculations, the internal resistance to be analyzed and the open circuit voltage of the battery determined by the internal resistance to be analyzed are obtained. Finally, the interval number is determined according to the preset relationship table, and an early warning analysis is performed based on the interval number to output a normal cell signal or an abnormal cell signal. Among them, the preset relationship table is a correspondence table between open circuit voltage and interval number. According to the size of the open circuit voltage, the interval number corresponding to the open circuit voltage at the current moment can be determined.

[0042] In some specific embodiments of the present application, Figure 2 As shown, the battery charging safety early warning method also includes:

[0043] Step S700: If the first difference is greater than or equal to the preset current jump threshold, the preset calculation times stored in the processor data storage unit cache are obtained, and the current step number is increased as the cumulative calculation times of the battery internal resistance.

[0044] It should be noted that the absolute value of the difference between the total current at the current moment and the previous preset moment is obtained to obtain a first difference. When the first difference is greater than or equal to a preset current jump threshold, the preset number of calculations stored in the processor data storage unit cache is obtained, and the current step number is added as the cumulative number of calculations of the battery internal resistance. The current step number refers to the number of times the difference in current magnitude between adjacent moments during rapid charging of the battery system is greater than the preset current jump threshold.

[0045] In some specific embodiments of the present application, Figure 3 As shown, the battery charging safety early warning method also includes:

[0046] Step S800: defining the total current and the total voltage at the current moment and the last preset moment as a first current value, a second current value, a first voltage value, and a second voltage value, respectively;

[0047] Step S900: Calculating a plurality of cell internal resistances according to the first current value, the second current value, the first voltage value, and the second voltage value;

[0048] Step S1000: Calculating an average value based on the internal resistances of multiple cells to obtain an average internal resistance.

[0049] It should be noted that when the first difference is greater than or equal to the preset current jump threshold, the total current and total voltage of the battery at the current moment and the previous preset moment are obtained, and the total current and total voltage at the current moment are defined as the first current value and the first voltage value, and the total current and total voltage at the previous preset moment are defined as the second current value and the second voltage value. Based on the first current value, the second current value, the first voltage value, and the second voltage value, multiple single-cell internal resistances (i.e., the internal resistances at different step currents) are calculated; the average value of the obtained multiple single-cell internal resistances is calculated to obtain the average internal resistance. The calculated single-cell internal resistance and average internal resistance are stored in the processor data storage unit cache for calculation in the next charging cycle.

[0050] In some specific embodiments of the present application, Figure 4 As shown, step S400: comparing the cumulative calculation times with the preset threshold times to obtain a first comparison result, and determining the internal resistance to be analyzed based on the first comparison result, the cached battery internal resistance, and the default battery internal resistance, including but not limited to the following steps:

[0051] Step S410: If the first comparison result is that the cumulative number of calculations is greater than the preset threshold number, the cache battery internal resistance is obtained as the internal resistance to be analyzed;

[0052] Step S420: If the first comparison result is that the cumulative calculation times are less than or equal to the preset threshold times, a default battery internal resistance is obtained as the internal resistance to be analyzed.

[0053] It should be noted that the cumulative number of calculations is compared with the preset threshold number to obtain a first comparison result. When the first comparison result is that the cumulative number of calculations is greater than the preset threshold number, the cached battery internal resistance cached in the processor data storage unit is obtained as the internal resistance to be analyzed for early warning analysis; when the first comparison result is that the cumulative number of calculations is less than or equal to the preset threshold number, the default battery internal resistance is obtained as the internal resistance to be analyzed for early warning analysis.

[0054] In some specific embodiments of the present application, Figure 5 As shown, step S600: determining the interval number according to the open circuit voltage and the preset relationship table, and performing early warning analysis according to the interval number to output a normal cell signal or an abnormal cell signal, including but not limited to the following steps:

[0055] Step S610: Obtaining a first interval number corresponding to the open circuit voltage at the current moment and a second interval number corresponding to the open circuit voltage at the last preset moment according to the open circuit voltage and the preset relationship table;

[0056] Step S620: Compare the first interval number and the second interval number to obtain a second comparison result;

[0057] Step S630: performing a warning analysis according to the second comparison result to output a normal cell signal or an abnormal cell signal.

[0058] It should be noted that the interval number corresponding to the open-circuit voltage at the current moment is determined as the first interval number based on the preset relationship table, and the interval number corresponding to the open-circuit voltage at the previous preset moment is determined as the second interval number based on the preset relationship table. The first interval number and the second interval number are compared to see whether they are in the same interval, thereby obtaining a second comparison result. Based on the second comparison result, an early warning analysis of the battery is then performed to obtain a normal cell signal or a cell abnormality signal. The user can perform maintenance on the corresponding battery in the battery system based on the cell abnormality signal, thereby ensuring the normal operation of the battery system and reducing the occurrence of safety accidents.

[0059] In some specific embodiments of the present application, Figure 6 As shown, step S630: performing early warning analysis according to the second comparison result to output a normal cell signal or an abnormal cell signal, including but not limited to the following steps:

[0060] Step S631: If the second comparison result shows that the first interval number and the second interval number are in the same interval, the number of calculations of the open circuit voltage difference is increased to obtain the sum of the average open circuit voltages in a preset interval, and a cell normal signal is output; wherein the preset interval is the interval where the first interval number is located;

[0061] Step S632: If the second comparison result is that the first interval number and the second interval number are in different intervals, the warning value of the interval where the second interval number is located is determined based on the cache warning threshold in the processor data storage unit and the open circuit voltage difference at the current moment, and the warning threshold is updated, and the number of calculations is cleared; the warning value is compared with the preset reference value to obtain a third comparison result, and a normal cell signal or an abnormal cell signal is output according to the third comparison result.

[0062] Specifically, if the second comparison result indicates that the first and second interval numbers are within the same interval, the number of open-circuit voltage difference calculations is increased and cached in the processor data storage unit. Simultaneously, the sum of the average open-circuit voltages within the preset interval is calculated, a cell normal signal is output, and a warning analysis is performed on the battery at the next moment.

[0063] When the second comparison result obtained indicates that the first interval number and the second interval number are in different intervals, a warning calculation is performed for the interval in which the second interval number is located. The warning value for the interval in which the second interval number is located is obtained based on the difference between the warning threshold cached in the processor data storage unit cache and the open circuit voltage difference at the current moment. The warning threshold cached in the processor data storage unit is updated based on the open circuit voltage difference calculated at the current moment, that is, the open circuit voltage difference is stored in the warning threshold cached in the processor data storage unit; at the same time, the number of open circuit voltage difference calculations is reset to zero. The warning value is compared with a preset reference value to obtain a third comparison result, and a corresponding signal, such as a normal cell signal or an abnormal cell signal, is output based on the third comparison result, thereby completing the warning analysis of the battery. The preset reference value can be set as required.

[0064] In some specific embodiments of the present application, Figure 7 As shown, step S632: comparing the warning value with the preset reference value to obtain a third comparison result, and outputting a normal cell signal or an abnormal cell signal according to the third comparison result, including but not limited to the following steps:

[0065] Step S6321: If the third comparison result is that the warning value is less than or equal to the preset reference value, outputting a cell normal signal;

[0066] Step S6322: If the third comparison result is that the warning value is greater than the preset reference value, a cell abnormality signal is output.

[0067] For example, the warning value is compared with the preset reference value to obtain a third comparison result. When the third comparison result is that the warning value is less than or equal to the preset reference value, a normal cell signal is output, that is, the battery after the warning analysis can operate normally, and a battery charging safety warning analysis is performed at the next moment; when the third comparison result is that the warning value is greater than the preset reference value, an abnormal cell signal is output, that is, the battery after the warning analysis may have hidden dangers. The user can maintain the corresponding battery according to the abnormal cell signal to ensure the normal operation of the battery system and perform a battery charging safety warning analysis at the next moment, thereby improving the timeliness of the warning analysis.

[0068] In a second aspect, an embodiment of the present application further provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the battery charging safety warning method of the embodiment of the first aspect of the present application is implemented.

[0069] The processor and the memory may be connected via a bus or other means.

[0070] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0071] In a third aspect, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the battery charging safety warning method of the embodiment of the first aspect of the present application.

[0072] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0073] Reference below Figure 8 The battery charging safety warning method according to the embodiment of the present application is described in detail with a specific embodiment. It is worth noting that the following description is only for illustrative purposes and is not intended to limit the present application.

[0074] like Figure 8 As shown, the operating status and operating data of the battery system at the current time t and the previous preset time t-1 are obtained, where the operating data includes the total voltage V pack (t), total current I(t), cell voltage V[](t), SOC(t), number of series cells N, where [] represents a multidimensional array. When the current operating state at time t is charging, the absolute value of the difference between the total current I(t) at the current moment and the total current I(t-1) at the previous preset moment is obtained to obtain a first difference. The first difference is compared with the preset current jump threshold I th The battery internal resistance is determined by comparing the accumulated calculation times. When the first difference is less than the preset current jump threshold I th When the preset calculation times cached in the data storage unit of the processor are obtained as the cumulative calculation times N of the battery internal resistance R When the first difference is greater than or equal to the preset current jump threshold I thWhen the preset calculation times stored in the processor data storage unit cache are obtained, the current step number k is added as the cumulative calculation times N of the battery internal resistance. R When the first difference is greater than or equal to the preset current jump threshold I th When the total current and total voltage of the battery at the current time t and the previous preset time t-1 are obtained, the total current and total voltage at the current time are defined as the first current value I(t) and the first voltage value V i (t), the total current and total voltage at the previous preset moment are defined as the second current value I(t-1) and the second voltage value V i (t-1), according to the first current value I(t), the second current value I(t-1), the first voltage value V i (t) and the second voltage value V i (t-1) calculation to obtain multiple monomer internal resistance R i，k (i.e., internal resistance under different step currents); according to the obtained multiple monomer internal resistances R i，k Calculate the average value to get the average internal resistance R avg，k , where i represents the number of monomers, i=1, 2, ..., N.

[0075] Get the cumulative number of calculations N R After that, the cumulative number of calculations N R The first comparison result is obtained by comparing with the preset threshold number of times, and the internal resistance to be analyzed is determined according to the first comparison result. R When the number of times is greater than the preset threshold, the internal resistance R of the cache battery cached in the processor data storage unit is obtained. yj [] is used as the internal resistance R to be analyzed for early warning analysis; when the first comparison result is the cumulative calculation times N R When the number of times is less than or equal to the preset threshold, the default battery internal resistance R0[] is obtained as the internal resistance to be analyzed R[] for early warning analysis.

[0076] Determine the open circuit voltage OCV of the battery at the current moment based on the internal resistance R[] to be analyzed i (t), average open circuit voltage OCV avg (t) and the average open circuit voltage difference dOCV i (t). Determine the open circuit voltage OCV at the current moment according to the preset relationship table i (t) The interval number corresponding to the first interval number ocv_ID(t) is determined according to the preset relationship table to determine the open circuit voltage OCV at the previous preset moment iThe interval number corresponding to (t-1) is the second interval number ocv_ID(t-1). The first interval number ocv_ID(t) and the second interval number ocv_ID(t-1) are compared to see whether they are in the same number interval, thereby obtaining a second comparison result.

[0077] When the second comparison result is that the first interval number ocv_ID(t) and the second interval number ocv_ID(t-1) are in the same interval, the number of calculations of the open circuit voltage difference is increased by N. docv , and the number of calculations of the open circuit voltage difference N docv Cache to the processor data storage unit. At the same time, calculate the sum of the average open circuit voltage dOCV within the preset interval dOCV i，avg , output the normal signal of the battery cell at the same time, and perform early warning analysis on the battery at the next moment. When the second comparison result obtained is that the first interval number ocv_ID(t) and the second interval number ocv_ID(t-1) are in different intervals, then the early warning calculation is performed on the interval where the second interval number ocv_ID(t-1) is located, and the cache early warning threshold YJ in the processor data storage unit cache is used. i,ocv_ID and the current open circuit voltage difference dOCV i,avg / N docv The difference between the two intervals is the warning value YJ_Flag of the interval where the second interval number is located. i , and the open circuit voltage difference dOCV calculated at the current moment i,avg / N doc The warning threshold YJ for the cache in the processor data storage unit i,ocv_ID Update; at the same time, the number of calculations of the open circuit voltage difference N docv Cleared to zero.

[0078] Set the warning value YJ_Flag i Compare with the preset reference value to obtain a third comparison result. When the third comparison result is the warning value YJ_Flag i When the value is less than or equal to the preset reference value, the cell normal signal is output; when the third comparison result is the warning value YJ_Flag i When it is greater than the preset reference value, the battery cell abnormality signal is output.

[0079] Through the battery charging safety warning method proposed in the embodiment of the present application, the user can maintain the corresponding battery according to the abnormal signal of the battery cell to ensure the normal operation of the battery system, and perform battery charging safety warning analysis at the next moment, thereby improving the timeliness of the warning analysis.

[0080] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A battery charging safety early warning method, characterized in that: include: Obtaining the operating status and operating data of the battery system at the current moment and the last preset moment, wherein the operating data includes: total voltage, total current, and single cell voltage; If the current operating state is charging, obtaining an absolute value of a difference between the total current at the current moment and the total current at the last preset moment to obtain a first difference; If the first difference is less than the preset current jump threshold, obtaining the preset number of calculations stored in the cache of the processor data storage unit as the cumulative number of calculations of the battery internal resistance; Comparing the accumulated calculation times with a preset threshold number to obtain a first comparison result, and determining the internal resistance to be analyzed according to the first comparison result, the cached battery internal resistance, and the default battery internal resistance; determining an open circuit voltage, an average open circuit voltage, and an open circuit voltage difference of a battery according to the internal resistance to be analyzed, the total current, and the total voltage; Determine an interval number according to the open circuit voltage and a preset relationship table, and perform early warning analysis according to the interval number to output a normal cell signal or an abnormal cell signal; wherein the preset relationship table includes a correspondence between the open circuit voltage and the interval number; The determining of the interval number according to the open circuit voltage and the preset relationship table, and performing early warning analysis according to the interval number to output a normal cell signal or an abnormal cell signal, includes: Obtaining, according to the open circuit voltage and the preset relationship table, a first interval number corresponding to the open circuit voltage at a current moment and a second interval number corresponding to the open circuit voltage at a previous preset moment; Comparing the first interval number and the second interval number to obtain a second comparison result; An early warning analysis is performed according to the second comparison result to output a normal cell signal or an abnormal cell signal.

2. The battery charging safety early warning method according to claim 1, characterized in that: Also includes: If the first difference is greater than or equal to the preset current jump threshold, the preset calculation times stored in the cache of the processor data storage unit are obtained, and the current step number is increased as the cumulative calculation times of the battery internal resistance.

3. The battery charging safety early warning method according to claim 2, characterized in that: Also includes: The total current and the total voltage at the current moment and the last preset moment are defined as a first current value, a second current value, a first voltage value, and a second voltage value, respectively; Calculating a plurality of monomer internal resistances according to the first current value, the second current value, the first voltage value, and the second voltage value; Calculating an average value based on the multiple monomer internal resistances to obtain an average internal resistance; The single cell internal resistance and the average internal resistance are stored in the cache of the processor data storage unit for calculation in the next charging cycle.

4. The battery charging safety early warning method according to claim 1, characterized in that: The step of comparing the accumulated calculation times with a preset threshold number to obtain a first comparison result, and determining the internal resistance to be analyzed according to the first comparison result, the cached battery internal resistance, and the default battery internal resistance, includes: If the first comparison result is that the cumulative calculation times is greater than the preset threshold times, obtaining the cache battery internal resistance as the internal resistance to be analyzed; If the first comparison result is that the cumulative number of calculations is less than or equal to the preset threshold, the default battery internal resistance is obtained as the internal resistance to be analyzed.

5. The battery charging safety early warning method according to claim 1, characterized in that: The performing early warning analysis according to the second comparison result to output a normal cell signal or an abnormal cell signal includes: If the second comparison result is that the first interval number and the second interval number are in the same interval, then the number of calculations of the open circuit voltage difference is increased to obtain the sum of the average open circuit voltages in a preset interval, and the battery cell normal signal is output; wherein the preset interval is the interval where the first interval number is located; If the second comparison result is that the first interval number and the second interval number are in different intervals, the warning value of the interval where the second interval number is located is determined based on the cache warning threshold in the processor data storage unit and the open circuit voltage difference at the current moment, and the warning threshold is updated, and the number of calculations is cleared; the warning value is compared with a preset reference value to obtain a third comparison result, and the battery cell normal signal or the battery cell abnormal signal is output according to the third comparison result.

6. The battery charging safety early warning method according to claim 5, characterized in that: The step of comparing the warning value with a preset reference value to obtain a third comparison result, and outputting the normal cell signal or the abnormal cell signal according to the third comparison result, includes: If the third comparison result is that the warning value is less than or equal to the preset reference value, outputting the battery cell normal signal; If the third comparison result is that the warning value is greater than the preset reference value, the battery cell abnormality signal is output.

7. Electronic equipment, including: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the battery charging safety early warning method according to any one of claims 1 to 6 when executing the computer program.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the battery charging safety early warning method according to any one of claims 1 to 6.

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