A method, apparatus, equipment, medium, and product for adaptive adjustment of multi-point correction threshold of state of charge (SOC) at the charging end of a lithium iron phosphate battery.

Abstract

This application discloses a method, apparatus, device, medium, and product for adaptive adjustment of the SOC multi-point correction threshold at the end of charging for lithium iron phosphate batteries, relating to the field of battery management technology. The method includes: firstly, determining whether a full-charge correction was performed during the previous charge; if so, monitoring the maximum single-cell voltage during the current charge and dynamically adjusting the SOC correction threshold according to preset conditions (such as voltage value, voltage change, and a specific correction voltage); if not, adjusting the SOC correction threshold accordingly when the maximum single-cell voltage is detected to be equal to the inflection point voltage or other correction voltage. This application improves the accuracy of SOC estimation for lithium iron phosphate batteries through real-time monitoring and dynamic adjustment, effectively avoiding overcharging or over-discharging, extending battery life, and ensuring the safety and efficiency of the charging process.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and in particular to a method, apparatus, equipment, medium and product for adaptive adjustment of multi-point correction threshold of SOC at the charging end of a lithium iron phosphate battery. Background Technology

[0002] In the fields of new energy vehicles and energy storage, lithium iron phosphate batteries have become a widely used battery type due to their high safety, long lifespan, and cost-effectiveness. However, estimating the SOC (State of Charge) of lithium iron phosphate batteries has always been a key technical challenge in battery management systems, especially at the end of the charging process, where the accuracy of SOC estimation directly affects the battery's charging efficiency and safety.

[0003] Currently, the main methods for correcting the State of Charge (SOC) of lithium iron phosphate (LFP) batteries are full-charge or full-discharge correction, especially after the battery voltage reaches a high or low inflection point. For full-charge correction, a common strategy is multi-point correction, which involves pre-setting multiple voltage points after the inflection point and manually calibrating the corresponding SOC correction values ​​for these points. When the battery voltage reaches these preset points during charging, if the current SOC is less than the corresponding SOC threshold, SOC correction is performed; otherwise, it remains unchanged. This method improves the accuracy of SOC estimation to some extent, but it has significant limitations.

[0004] Existing multi-point SOC correction methods for lithium iron phosphate batteries use fixed voltage points and SOC thresholds for correction. However, due to differences in battery manufacturing processes and performance variations under different operating conditions, the inflection point voltage and the corresponding SOC correction threshold for the preset voltage point can differ between the same or different batches of batteries. Therefore, if all cells use the same SOC correction threshold, the accuracy requirements for SOC estimation under different operating conditions cannot be met. Although SOC correction thresholds for different batteries can be obtained through charge-discharge tests, this method is not only time-consuming and labor-intensive but also costly, hindering large-scale applications. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, device, medium, and product for adaptive adjustment of the SOC multi-point correction threshold at the end of charging of lithium iron phosphate batteries, which can flexibly adjust the correction threshold and effectively improve the SOC estimation accuracy of the battery at the end of charging.

[0006] To achieve the above objectives, this application provides the following solution:

[0007] In a first aspect, this application provides an adaptive adjustment method for the multi-point correction threshold of state of charge (SOC) at the end of charging of a lithium iron phosphate battery, including:

[0008] Determine whether the battery module underwent a full charge correction during the previous charging process to obtain the first determination result;

[0009] If the first judgment result is yes, then during the current charging process, the maximum single-cell voltage of the battery module is monitored in real time. When the maximum single-cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition. The first preset condition is that the maximum single-cell voltage is greater than or equal to a preset single-cell voltage value, and the change in the maximum single-cell voltage within a preset time period is not greater than a preset single-cell voltage difference value. The second preset condition is that the maximum single-cell voltage is equal to the first correction voltage. The third preset condition is that the maximum single-cell voltage is equal to the second correction voltage. The first correction voltage and the second correction voltage are both set values ​​in the SOC correction process of the lithium iron phosphate battery, and the first correction voltage is greater than the inflection point voltage, the second correction voltage is greater than the first correction voltage, and the second correction voltage is less than the charging cutoff voltage.

[0010] If the first judgment result is negative, the maximum single-cell voltage of the battery module is monitored in real time during the current charging process. When the maximum single-cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected based on the maximum single-cell voltage that meets the fourth preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected based on the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected based on the maximum single-cell voltage that meets the third preset condition. The fourth preset condition is that the maximum single-cell voltage is equal to the inflection point voltage.

[0011] Optionally, the first SOC correction threshold is corrected based on the SOC corresponding to the maximum single-cell voltage that satisfies the fourth preset condition, specifically including:

[0012] Determine whether the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that satisfies the fourth preset condition and the first SOC correction threshold is greater than the preset deviation threshold, and obtain the second judgment result;

[0013] If the second judgment result is yes, then the first SOC correction threshold is corrected using the following formula;

[0014] SOC0′=SOC M4 -min[ΔSOC 0 2,SOC1-SOC0];

[0015] ΔSOC0=SOC M4 -SOC0|;

[0016] Where SOC0′ represents the corrected first SOC correction threshold, SOC M4 SOC represents the SOC corresponding to the maximum single-cell voltage that meets the fourth preset condition, SOC0 represents the first SOC correction threshold, SOC1 represents the second SOC correction threshold, and ΔSOC0 represents the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that meets the fourth preset condition and the first SOC correction threshold.

[0017] If the second judgment result is negative, the first SOC correction threshold will not be corrected.

[0018] Optionally, it is determined whether the battery module underwent a full charge correction during the previous charging process to obtain a first determination result, which specifically includes:

[0019] Determine whether the maximum single-cell voltage at the end of the previous charging process has reached the charging cutoff voltage;

[0020] If the maximum single-cell voltage reaches the charging cutoff voltage at the end of the previous charging process, it is determined that the battery module performed a full charge correction during the previous charging process; otherwise, it is determined that the battery module did not perform a full charge correction during the previous charging process.

[0021] Optionally, the initial values ​​of the first SOC correction threshold, the second SOC correction threshold, and the third SOC correction threshold are all obtained through standard discharge tests.

[0022] Optionally, the initial value of the inflection point voltage, the value of the first correction voltage, and the value of the second correction voltage are all set according to the OCV table.

[0023] Optionally, the preset single-cell voltage value is 3.4V, the preset time period is 5s, and the preset single-cell voltage difference value is 5mV.

[0024] Secondly, this application provides an adaptive adjustment device for the multi-point correction threshold of a lithium iron phosphate battery at the end of charging, comprising:

[0025] The full charge correction judgment module is used to determine whether the battery module has undergone full charge correction during the previous charging process and obtain the first judgment result.

[0026] The first correction threshold module is used to monitor the maximum single-cell voltage of the battery module in real time during the current charging process if the first judgment result is yes. When the maximum single-cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition. The first preset condition is that the maximum single-cell voltage is greater than or equal to a preset single-cell voltage value, and the change in the maximum single-cell voltage within a preset time period is not greater than a preset single-cell voltage difference value. The second preset condition is that the maximum single-cell voltage is equal to the first correction voltage. The third preset condition is that the maximum single-cell voltage is equal to the second correction voltage. The first correction voltage and the second correction voltage are both set values ​​in the SOC correction process of the lithium iron phosphate battery, and the first correction voltage is greater than the inflection point voltage, the second correction voltage is greater than the first correction voltage, and the second correction voltage is less than the charging cutoff voltage.

[0027] The second correction module for the correction threshold is used to monitor the maximum single-cell voltage of the battery module in real time during the current charging process if the first judgment result is negative. When the maximum single-cell voltage meets a fourth preset condition, the first SOC correction threshold is corrected based on the maximum single-cell voltage that meets the fourth preset condition; when the maximum single-cell voltage meets a second preset condition, the second SOC correction threshold is corrected based on the maximum single-cell voltage that meets the second preset condition; when the maximum single-cell voltage meets a third preset condition, the third SOC correction threshold is corrected based on the maximum single-cell voltage that meets the third preset condition; the fourth preset condition is that the maximum single-cell voltage is equal to the inflection point voltage.

[0028] Thirdly, this application provides a computer device, 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 to implement the steps of the adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging end as described above.

[0029] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging end SOC as described above.

[0030] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging terminal SOC as described above.

[0031] According to the specific embodiments provided in this application, this application has the following technical effects:

[0032] This application provides a method, apparatus, device, medium, and product for adaptive adjustment of the SOC multi-point correction threshold at the charging end of a lithium iron phosphate battery. By determining whether a full charge correction was performed during the previous charge and adopting different correction strategies accordingly, it achieves intelligent identification and adaptation of the battery state, solving the correction difficulties caused by differences in battery characteristics under different charging states, and improving the accuracy and flexibility of correction. By monitoring the maximum single-cell voltage of the battery module in real time and dynamically adjusting the SOC correction threshold according to preset conditions, it achieves accurate estimation of the SOC at the charging end of the lithium iron phosphate battery, solving the problem of inaccurate SOC estimation in traditional methods, especially the error prone to occur at the charging end. By setting multiple preset conditions (such as voltage value, voltage change, and specific correction voltage) and correcting the SOC correction threshold when the conditions are met, it achieves comprehensive monitoring and timely adjustment of the battery state, solving the correction deviation that may be caused by a single correction point, and improving the accuracy and reliability of battery management.

[0033] In summary, this application achieves adaptive adjustment of the SOC multi-point correction threshold by precisely controlling the SOC multi-point correction threshold at the charging end of the lithium iron phosphate battery, thereby improving the intelligence level of the battery management system, the battery utilization efficiency, and extending the battery life. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is an application environment diagram of an adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging terminal SOC in one embodiment of this application.

[0036] Figure 2 A flowchart illustrating an adaptive adjustment method for the multi-point correction threshold of a lithium iron phosphate battery at the charging end, provided in an embodiment of this application;

[0037] Figure 3A schematic diagram of the functional modules of a lithium iron phosphate battery charging terminal SOC multi-point correction threshold adaptive adjustment device provided in an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] The adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging end provided in this application embodiment can be applied to, for example... Figure 1In the application environment shown, terminal 102 communicates with server 104 via a network. A data storage system can store the data that server 104 needs to process. The data storage system can be set up independently, integrated into server 104, or placed in the cloud or on other servers. Terminal 102 can determine whether the battery module underwent full-charge correction during the previous charging process and send the first determination result to server 104. After receiving the first determination result, if the first determination result is yes, server 104 monitors the maximum single-cell voltage of the battery module in real time during the current charging process. When the maximum single-cell voltage meets a first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets a second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. OC; when the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition; if the first judgment result is negative, the maximum single-cell voltage of the battery module is monitored in real time during the current charging process. When the maximum single-cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected according to the maximum single-cell voltage that meets the fourth preset condition; when the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected according to the maximum single-cell voltage that meets the second preset condition; when the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected according to the maximum single-cell voltage that meets the third preset condition. The server 104 can feed back the obtained corrected inflection point voltage and SOC correction threshold to the terminal 102. In addition, in some embodiments, the adaptive adjustment method of multi-point correction threshold of SOC at the charging end of lithium iron phosphate battery can also be implemented by the server 104 or the terminal 102 alone.

[0042] In one exemplary embodiment, such as Figure 2 As shown, an adaptive adjustment method for the multi-point correction threshold of state of charge (SOC) at the charging end of a lithium iron phosphate battery is provided. This method is executed by a computer device, specifically by a terminal or server alone, or by both a terminal and a server. In this embodiment, the method is applied to... Figure 1 Taking server 104 as an example, the explanation includes the following steps 201 to 203. Wherein:

[0043] Step 201: Determine whether the battery module underwent a full charge correction during the previous charging process to obtain the first determination result.

[0044] Step 202: If the first judgment result is yes, then during the current charging process, the maximum single-cell voltage of the battery module is monitored in real time. When the maximum single-cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition. The first preset condition is that the maximum single-cell voltage is greater than or equal to a preset single-cell voltage value, and the change in the maximum single-cell voltage within a preset time period is not greater than a preset single-cell voltage difference value. The second preset condition is that the maximum single-cell voltage is equal to the first correction voltage. The third preset condition is that the maximum single-cell voltage is equal to the second correction voltage. The first correction voltage and the second correction voltage are both set values ​​in the SOC correction process of the lithium iron phosphate battery, and the first correction voltage is greater than the inflection point voltage, the second correction voltage is greater than the first correction voltage, and the second correction voltage is less than the charging cutoff voltage.

[0045] Step 203: If the first judgment result is negative, monitor the maximum single-cell voltage of the battery module in real time during the current charging process. When the maximum single-cell voltage meets the fourth preset condition, correct the first SOC correction threshold according to the maximum single-cell voltage that meets the fourth preset condition; when the maximum single-cell voltage meets the second preset condition, correct the second SOC correction threshold according to the maximum single-cell voltage that meets the second preset condition; when the maximum single-cell voltage meets the third preset condition, correct the third SOC correction threshold according to the maximum single-cell voltage that meets the third preset condition; the fourth preset condition is that the maximum single-cell voltage is equal to the inflection point voltage.

[0046] By implementing steps 201 to 203 above, this application can identify the inflection point voltage at the end of charging, and can also adaptively adjust the SOC correction threshold corresponding to the end voltage according to the charging characteristics of the battery cell.

[0047] In another exemplary embodiment of this application, step 203 specifically includes:

[0048] Determine whether the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that satisfies the fourth preset condition and the first SOC correction threshold is greater than the preset deviation threshold, and obtain the second judgment result.

[0049] If the second judgment result is yes, then the first SOC correction threshold is corrected using the following formula.

[0050] SOC0′=SOC M4 -min[ΔSOC0 2,SOC1-SOC0];

[0051] ΔSOC0=SOC M4 -SOC0|;

[0052] Where SOC0′ represents the corrected first SOC correction threshold, SOC M4 SOC represents the SOC corresponding to the maximum single-cell voltage that satisfies the fourth preset condition. SOC0 represents the first SOC correction threshold, SOC1 represents the second SOC correction threshold, and ΔSOC0 represents the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that satisfies the fourth preset condition and the first SOC correction threshold.

[0053] If the second judgment result is negative, the first SOC correction threshold will not be corrected.

[0054] As charging progresses, when the maximum single-cell voltage of the battery module reaches the first correction voltage and the second correction voltage, the second SOC correction threshold and the third SOC correction threshold undergo the same correction process as described above. Upon completion of charging, the first SOC correction threshold, the second SOC correction threshold, and the third SOC correction threshold are saved as the thresholds for the next charging end-of-charge SOC correction. Specifically, this includes:

[0055] Determine whether the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that meets the second preset condition and the second SOC correction threshold is greater than the preset deviation threshold, and obtain the third judgment result.

[0056] If the third judgment result is yes, then the second SOC correction threshold is corrected using the following formula.

[0057] SOC1′=SOC M2 -min[ΔSOC 1 2,SOC2-SOC1];

[0058] ΔSOC1=SOC M2 -SOC1|;

[0059] Where SOC1′ represents the corrected second SOC correction threshold, SOC M2 SOC represents the SOC corresponding to the maximum single-cell voltage that meets the second preset condition, SOC2 represents the third SOC correction threshold, and ΔSOC1 represents the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that meets the second preset condition and the second SOC correction threshold.

[0060] If the third judgment result is negative, the second SOC correction threshold will not be corrected.

[0061] Determine whether the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that meets the third preset condition and the third SOC correction threshold is greater than the preset deviation threshold, and obtain the fourth judgment result.

[0062] If the fourth judgment result is yes, then the third SOC correction threshold is corrected using the following formula.

[0063] SOC2′=SOC M3 -min[ΔSOC 2 2,SOC3-SOC2];

[0064] ΔSOC2=SOC M3 -SOC2|;

[0065] Where SOC2′ represents the corrected third SOC correction threshold, SOC M3 SOC represents the SOC corresponding to the maximum single-cell voltage that meets the third preset condition, SOC3 represents the fourth SOC correction threshold, and ΔSOC2 represents the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that meets the third preset condition and the third SOC correction threshold. The fourth SOC correction threshold is set to the charging cutoff SOC according to the project and will not be adaptively corrected thereafter.

[0066] If the fourth judgment result is negative, the third SOC correction threshold will not be corrected.

[0067] In this implementation method, the preset deviation threshold is 2%.

[0068] As an optional implementation, it is determined whether the battery module underwent a full charge correction during the previous charging process to obtain a first determination result, specifically including:

[0069] Determine whether the maximum single-cell voltage at the end of the previous charging process has reached the charging cutoff voltage.

[0070] If the maximum single-cell voltage reaches the charging cutoff voltage at the end of the previous charging process, it is determined that the battery module performed a full charge correction during the previous charging process; otherwise, it is determined that the battery module did not perform a full charge correction during the previous charging process.

[0071] In this implementation, if the charging voltage reaches the charging cutoff voltage, the SOC value corresponding to that charging voltage will be modified to the preset full-charge SOC value. For example, when the charging cutoff voltage, such as 3.65V, is reached during charging, the SOC will be forcibly corrected to 100% or other required values.

[0072] As an optional implementation, the initial values ​​of the first SOC correction threshold, the second SOC correction threshold, and the third SOC correction threshold are all obtained through standard discharge tests.

[0073] As an optional implementation, the initial value of the inflection point voltage, the value of the first correction voltage, and the value of the second correction voltage are all set according to the OCV table. Furthermore, the inflection point voltage is less than the first correction voltage, the first correction voltage is less than the second correction voltage, and the second correction voltage is less than the charging cutoff voltage.

[0074] As an optional implementation, the preset single-cell voltage value is 3.4V, the preset time period is 5s, and the preset single-cell voltage difference value is 5mV.

[0075] This application also provides an application scenario in which the aforementioned adaptive adjustment method for the multi-point correction threshold of SOC at the charging end of a lithium iron phosphate battery is applied. Specifically, the adaptive adjustment method for the multi-point correction threshold of SOC at the charging end of a lithium iron phosphate battery provided in this embodiment can be applied to the scenario of electric vehicle charging management. This scenario includes a battery monitoring stage, a SOC estimation stage, and a charging strategy adjustment stage. The electric vehicle enters the charging process from the battery monitoring stage, obtains the corresponding battery status information by real-time monitoring of the maximum single-cell voltage of the battery module and the SOC estimation method, and then enters the charging strategy adjustment stage. The adaptive adjustment method for the multi-point correction threshold of SOC at the charging end of a lithium iron phosphate battery provided in this embodiment belongs to the SOC correction threshold adjustment stage in the charging strategy adjustment stage. Specifically, at the battery module end of the charging process, the SOC correction threshold can be adaptively adjusted based on the matching of the real-time monitored maximum single-cell voltage with preset conditions, thereby ensuring the safe and efficient charging of the lithium iron phosphate battery and extending the battery life.

[0076] Based on the same inventive concept, this application also provides a device for adaptively adjusting the multi-point correction threshold of the SOC at the charging end of a lithium iron phosphate battery as described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the adaptively adjusting multi-point correction threshold of the SOC at the charging end of a lithium iron phosphate battery provided below can be found in the limitations of the adaptively adjusting method for the SOC at the charging end of a lithium iron phosphate battery described above, and will not be repeated here.

[0077] In one exemplary embodiment, such as Figure 3 As shown, a multi-point correction threshold adaptive adjustment device for the SOC of a lithium iron phosphate battery at the charging end is provided, comprising:

[0078] The full charge correction judgment module 301 is used to determine whether the battery module has performed a full charge correction during the previous charging process and obtain the first judgment result.

[0079] The first correction module 302 is used to monitor the maximum single-cell voltage of the battery module in real time during the current charging process if the first judgment result is yes. When the maximum single-cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition. The first preset condition is that the maximum single-cell voltage is greater than or equal to a preset single-cell voltage value, and the change in the maximum single-cell voltage within a preset time period is not greater than a preset single-cell voltage difference value. The second preset condition is that the maximum single-cell voltage is equal to the first correction voltage. The third preset condition is that the maximum single-cell voltage is equal to the second correction voltage. The first correction voltage and the second correction voltage are both set values ​​in the SOC correction process of the lithium iron phosphate battery, and the first correction voltage is greater than the inflection point voltage, the second correction voltage is greater than the first correction voltage, and the second correction voltage is less than the charging cutoff voltage.

[0080] The second correction module 303 is used to monitor the maximum single-cell voltage of the battery module in real time during the current charging process if the first judgment result is negative. When the maximum single-cell voltage meets a fourth preset condition, the first SOC correction threshold is corrected based on the maximum single-cell voltage that meets the fourth preset condition; when the maximum single-cell voltage meets a second preset condition, the second SOC correction threshold is corrected based on the maximum single-cell voltage that meets the second preset condition; when the maximum single-cell voltage meets a third preset condition, the third SOC correction threshold is corrected based on the maximum single-cell voltage that meets the third preset condition; the fourth preset condition is that the maximum single-cell voltage is equal to the inflection point voltage.

[0081] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 4As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores SOC multi-point correction threshold processing data. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements an adaptive adjustment method for the SOC multi-point correction threshold at the charging end of a lithium iron phosphate battery.

[0082] Those skilled in the art will understand that Figure 4 The structures shown are merely block diagrams of some structures related to the present application and do not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than shown in the figures, or combine certain components, or have different component arrangements. In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0083] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0084] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0085] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0086] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0087] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for adaptive adjustment of the multi-point correction threshold of state of charge (SOC) at the charging end of a lithium iron phosphate battery, characterized in that, The adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging end SOC includes: Determine whether the battery module underwent a full charge correction during the previous charging process to obtain the first determination result; If the first judgment result is yes, then during the current charging process, the maximum single-cell voltage of the battery module is monitored in real time. When the maximum single-cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition. The first preset condition is that the maximum single-cell voltage is greater than or equal to a preset single-cell voltage value, and the change in the maximum single-cell voltage within a preset time period is not greater than a preset single-cell voltage difference value. The second preset condition is that the maximum single-cell voltage is equal to the first correction voltage. The third preset condition is that the maximum single-cell voltage is equal to the second correction voltage. The first correction voltage and the second correction voltage are both set values ​​in the SOC correction process of the lithium iron phosphate battery, and the first correction voltage is greater than the inflection point voltage, the second correction voltage is greater than the first correction voltage, and the second correction voltage is less than the charging cutoff voltage. If the first judgment result is negative, the maximum single-cell voltage of the battery module is monitored in real time during the current charging process. When the maximum single-cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected based on the maximum single-cell voltage that meets the fourth preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected based on the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected based on the maximum single-cell voltage that meets the third preset condition. The fourth preset condition is that the maximum single-cell voltage is equal to the inflection point voltage.

2. The adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging terminal according to claim 1, characterized in that, The first SOC correction threshold is corrected based on the maximum single-cell voltage that meets the fourth preset condition, specifically including: Determine whether the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that satisfies the fourth preset condition and the first SOC correction threshold is greater than the preset deviation threshold, and obtain the second judgment result; If the second judgment result is yes, then the first SOC correction threshold is corrected using the following formula; SOC0′=SOC M4 -min[ΔSOC02,SOC1-SOC0]; ΔSOC0=|SOC M4 -SOC0|; Where SOC′0 represents the corrected first SOC correction threshold, SOC M4 SOC represents the SOC corresponding to the maximum single-cell voltage that meets the fourth preset condition, SOC0 represents the first SOC correction threshold, SOC1 represents the second SOC correction threshold, and ΔSOC0 represents the absolute value of the difference between the SOC corresponding to the maximum single-cell voltage that meets the fourth preset condition and the first SOC correction threshold. If the second judgment result is negative, the first SOC correction threshold will not be corrected.

3. The adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging terminal according to claim 1, characterized in that, The first judgment result is obtained by determining whether the battery module performed a full charge correction during the last charging process, specifically including: Determine whether the maximum single-cell voltage at the end of the previous charging process has reached the charging cutoff voltage; If the maximum single-cell voltage reaches the charging cutoff voltage at the end of the previous charging process, it is determined that the battery module performed a full charge correction during the previous charging process; otherwise, it is determined that the battery module did not perform a full charge correction during the previous charging process.

4. The adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging terminal according to claim 1, characterized in that, The initial values ​​of the first SOC correction threshold, the second SOC correction threshold, and the third SOC correction threshold were all obtained through standard discharge tests.

5. The adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging terminal according to claim 1, characterized in that, The initial value of the inflection point voltage, the value of the first correction voltage, and the value of the second correction voltage are all set according to the OCV table.

6. The adaptive adjustment method for multi-point correction threshold of lithium iron phosphate battery charging terminal according to claim 1, characterized in that, The preset single-cell voltage value is 3.4V, the preset time period is 5s, and the preset single-cell voltage difference value is 5mV.

7. A multi-point correction threshold adaptive adjustment device for the SOC of a lithium iron phosphate battery at the charging end, characterized in that, The adaptive adjustment device for multi-point correction threshold of lithium iron phosphate battery charging end SOC includes: The full charge correction judgment module is used to determine whether the battery module has undergone full charge correction during the previous charging process and obtain the first judgment result. The first correction threshold module is used to monitor the maximum single-cell voltage of the battery module in real time during the current charging process if the first judgment result is yes. When the maximum single-cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum single-cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the first preset condition. When the maximum single-cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the second preset condition. When the maximum single-cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum single-cell voltage that meets the third preset condition. The first preset condition is that the maximum single-cell voltage is greater than or equal to a preset single-cell voltage value, and the change in the maximum single-cell voltage within a preset time period is not greater than a preset single-cell voltage difference value. The second preset condition is that the maximum single-cell voltage is equal to the first correction voltage. The third preset condition is that the maximum single-cell voltage is equal to the second correction voltage. The first correction voltage and the second correction voltage are both set values ​​in the SOC correction process of the lithium iron phosphate battery, and the first correction voltage is greater than the inflection point voltage, the second correction voltage is greater than the first correction voltage, and the second correction voltage is less than the charging cutoff voltage. The second correction module for the correction threshold is used to monitor the maximum single-cell voltage of the battery module in real time during the current charging process if the first judgment result is negative. When the maximum single-cell voltage meets a fourth preset condition, the first SOC correction threshold is corrected based on the maximum single-cell voltage that meets the fourth preset condition; when the maximum single-cell voltage meets a second preset condition, the second SOC correction threshold is corrected based on the maximum single-cell voltage that meets the second preset condition; when the maximum single-cell voltage meets a third preset condition, the third SOC correction threshold is corrected based on the maximum single-cell voltage that meets the third preset condition; the fourth preset condition is that the maximum single-cell voltage is equal to the inflection point voltage.

8. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging end as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging end SOC as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the adaptive adjustment method for the multi-point correction threshold of the lithium iron phosphate battery charging end SOC as described in any one of claims 1-6.

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