Lithium iron phosphate battery charging tail end SOC multi-point correction threshold value self-adaptive adjustment method, device, equipment, medium and product

Abstract

The invention discloses a lithium iron phosphate battery charging tail end SOC multi-point correction threshold value self-adaptive adjustment method, device, equipment, medium and product, and relates to the technical field of battery management.The method comprises the steps that firstly, whether full charge correction is carried out in the last time of charging or not is judged, if yes, the maximum monomer voltage of a battery is monitored in the current charging process, and if not, the maximum monomer voltage of the battery is obtained; and the SOC correction threshold is dynamically adjusted according to preset conditions (such as a voltage value, a voltage variation and a specific correction voltage). And if the maximum monomer voltage is not corrected, correspondingly correcting the SOC correction threshold when the maximum monomer voltage is monitored to be equal to the inflection point voltage or other correction voltages. Through real-time monitoring and dynamic adjustment, the accuracy of SOC estimation of the lithium iron phosphate battery is improved, overcharge or overdischarge can be effectively avoided, the service life of the battery is prolonged, and meanwhile, the safety and high efficiency of the charging process are ensured.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a method, device, equipment, medium and product for adaptively adjusting a multi-point SOC correction threshold at a charging terminal of a lithium iron phosphate battery. Background Art

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

[0003] At present, the correction of SOC of lithium iron phosphate batteries mainly adopts full charge or full discharge correction method, especially the SOC correction is performed after the battery voltage reaches the high-end or low-end inflection point. For full charge correction, the commonly used strategy is the multi-point correction method, that is, multiple voltage points are preset after the inflection point voltage, and the SOC correction values ​​corresponding to these voltage points are manually calibrated. When the battery voltage reaches these preset points during charging, if the current SOC is less than the corresponding SOC threshold, the SOC correction is performed; if it is greater, it remains unchanged. This method improves the accuracy of SOC estimation to a certain extent, but it has obvious limitations.

[0004] The existing SOC multi-point correction method for lithium iron phosphate batteries uses fixed voltage points and SOC thresholds for correction. However, due to differences in battery production processes and changes in battery performance under different operating conditions, there are differences in the inflection point voltage and the SOC correction threshold corresponding to the preset voltage point of the same or different batches of batteries. Therefore, if all cells use the same SOC correction threshold, it will not be able to meet the accuracy requirements of SOC estimation under different operating conditions. Although the SOC correction threshold of different batteries can be obtained through charge and discharge tests, this method is not only time-consuming and labor-intensive, but also costly and is not conducive to large-scale application. Summary of the invention

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

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

[0007] In a first aspect, the present application provides a method for adaptively adjusting a multi-point correction threshold of SOC at a charging terminal of a lithium iron phosphate battery, comprising:

[0008] Determine whether the battery module has been fully charged during the last charging process, and obtain a first determination result;

[0009] If the first judgment result is yes, the maximum cell voltage of the battery module is monitored in real time during the current charging process. When the maximum cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the first preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; the first preset condition is that the maximum cell voltage is greater than or equal to the preset cell voltage value, and within the preset time period, the change in the maximum cell voltage is not greater than the preset cell pressure difference value; the second preset condition is that the maximum cell voltage is equal to the first correction voltage; the third preset condition is that the maximum 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 cut-off voltage;

[0010] If the first judgment result is no, the maximum cell voltage of the battery module is monitored in real time during the current charging process. When the maximum cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected according to the maximum cell voltage that meets the fourth preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected according to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected according to the maximum cell voltage that meets the third preset condition; the fourth preset condition is that the maximum cell voltage is equal to the inflection point voltage.

[0011] Optionally, the first SOC correction threshold is corrected according to the SOC corresponding to the maximum cell voltage that meets the fourth preset condition, specifically including:

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

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

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

[0015] ΔSOC 0 =SOC M4 -SOC 0 |;

[0016] Among them, SOC 0 ′ represents the first SOC correction threshold after correction, SOC M4 Indicates the SOC corresponding to the maximum cell voltage that meets the fourth preset condition, SOC 0 Indicates the first SOC correction threshold, SOC 1 represents the second SOC correction threshold, ΔSOC 0 Indicates the absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the fourth preset condition and the first SOC correction threshold;

[0017] If the second judgment result is no, the first SOC correction threshold is not corrected.

[0018] Optionally, determining whether the battery module has been fully charged during the last charging process to obtain a first determination result specifically includes:

[0019] Determine whether the maximum single cell voltage at the end of the last charging process has reached the charging cut-off voltage;

[0020] If the maximum single cell voltage at the end of the last charging process reaches the charging cut-off voltage, it is determined that the battery module has been fully charged during the last charging process, otherwise it is determined that the battery module has not been fully charged during the last charging process.

[0021] Optionally, the initial value of the first SOC correction threshold, the initial value of the second SOC correction threshold, and the initial value of the third SOC correction threshold are all obtained through a standard discharge test.

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

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

[0024] In a second aspect, the present application provides a device for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery, comprising:

[0025] A full charge correction judgment module is used to judge whether the battery module has been fully charged during the last charging process, and obtain a first judgment result;

[0026] The first correction module of the correction threshold is used for monitoring the maximum cell voltage of the battery module in real time during the current charging process if the first judgment result is yes. When the maximum cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the first preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; the first preset condition is that the maximum cell voltage is greater than or equal to the preset cell voltage value, and within the preset time period, the change of the maximum cell voltage is not greater than the preset cell pressure difference value; the second preset condition is that the maximum cell voltage is equal to the first correction voltage; the third preset condition is that the maximum 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 cut-off voltage;

[0027] The second correction module of the correction threshold is used for monitoring the maximum single cell voltage of the battery module in real time during the current charging process if the first judgment result is no; 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 fourth preset condition is that the maximum single cell voltage is equal to the inflection point voltage.

[0028] In a third aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery as described in any one of the above.

[0029] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal as described in any one of the above.

[0030] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned methods for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal.

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

[0032] The present application provides a method, device, equipment, medium and product for adaptively adjusting the multi-point correction threshold of SOC at the charging terminal of a lithium iron phosphate battery. By judging whether the last charge was fully charged and taking different correction strategies accordingly, the intelligent identification and adaptation of the battery state are realized, and the correction difficulties caused by differences in battery characteristics under different charging states are solved, and the accuracy and flexibility of the correction are improved. By real-time monitoring of the maximum single cell voltage of the battery module and dynamically adjusting the SOC correction threshold according to preset conditions, the accurate estimation of the SOC at the charging terminal of the lithium iron phosphate battery is realized, and the problem of inaccurate SOC estimation in traditional methods, especially the easy occurrence of errors at the charging terminal, is solved. 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, comprehensive monitoring and timely adjustment of the battery state are realized, and the correction deviation that may be caused by a single correction point is solved, and the accuracy and reliability of battery management are improved.

[0033] In summary, the present application realizes adaptive adjustment of the SOC multi-point correction threshold by precise control of 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 and the battery utilization efficiency and extending the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is an application environment diagram of a method for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal in one embodiment of the present application;

[0036] Figure 2 A schematic flow chart of a method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery provided in one embodiment of the present application;

[0037] Figure 3A schematic diagram of the functional modules of a device for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal provided in one embodiment of the present application;

[0038] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] The method for adaptively adjusting the SOC multi-point correction threshold of the lithium iron phosphate battery charging terminal provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can determine whether the battery module has been fully charged during the last charging process, and send the obtained first judgment result to the server 104. After the server 104 receives the first judgment result, if the first judgment result is yes, the 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 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. OC; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; if the first judgment result is no, the maximum cell voltage of the battery module is monitored in real time during the current charging process, and when the maximum cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected according to the maximum cell voltage that meets the fourth preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected according to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected according to the maximum cell voltage that meets the third preset condition. The server 104 can feed back the corrected inflection point voltage and SOC correction threshold to the terminal 102. In addition, in some embodiments, the method for adaptively adjusting the SOC multi-point correction threshold at the charging end of the lithium iron phosphate battery can also be implemented by the server 104 or the terminal 102 alone.

[0042] In an exemplary embodiment, Figure 2 As shown, a method for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in the example is used as an example to illustrate, including the following steps 201 to 203. Among them:

[0043] Step 201, determining whether the battery module has been fully charged during the last charging process, and obtaining a first determination result.

[0044] Step 202, if the first judgment result is yes, then in the current charging process, the maximum cell voltage of the battery module is monitored in real time. When the maximum cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the first preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; the first preset condition is that the maximum cell voltage is greater than or equal to the preset cell voltage value, and within the preset time period, the change in the maximum cell voltage is not greater than the preset cell pressure difference value; the second preset condition is that the maximum cell voltage is equal to the first correction voltage; the third preset condition is that the maximum 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 cut-off voltage.

[0045] Step 203, if the first judgment result is no, the maximum cell voltage of the battery module is monitored in real time during the current charging process, and when the maximum cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected according to the maximum cell voltage that meets the fourth preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected according to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected according to the maximum cell voltage that meets the third preset condition; the fourth preset condition is that the maximum cell voltage is equal to the inflection point voltage.

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

[0047] In another exemplary embodiment of the present application, the above step 203 specifically includes:

[0048] It is determined whether the absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the fourth preset condition and the first SOC correction threshold is greater than the preset deviation threshold to obtain a second determination result.

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

[0050] SOC 0 ′=SOC M4-min[ΔSOC 0 2.SOC 1 -SOC 0 ];

[0051] ΔSOC 0 =SOC M4 -SOC 0 |;

[0052] Among them, SOC 0 ′ represents the first SOC correction threshold after correction, SOC M4 Indicates the SOC corresponding to the maximum cell voltage that meets the fourth preset condition, SOC 0 Indicates the first SOC correction threshold, SOC 1 represents the second SOC correction threshold, ΔSOC 0 The absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the fourth preset condition and the first SOC correction threshold value.

[0053] If the second judgment result is no, the first SOC correction threshold is not corrected.

[0054] As the charging process proceeds, when the maximum 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 perform the same correction process as above. When charging is completed, 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 terminal SOC correction. Specifically, it includes:

[0055] It is determined whether the absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the second preset condition and the second SOC correction threshold is greater than the preset deviation threshold to obtain a third determination result.

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

[0057] SOC 1 ′=SOC M2 -min[ΔSOC 1 2.SOC 2 -SOC 1 ];

[0058] ΔSOC 1 =SOC M2 -SOC 1 |;

[0059] Among them, SOC 1 ′ represents the modified second SOC correction threshold, SOC M2Indicates the SOC corresponding to the maximum cell voltage that meets the second preset condition, SOC 2 represents the third SOC correction threshold, ΔSOC 1 The absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the second preset condition and the second SOC correction threshold.

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

[0061] It is determined whether the absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the third preset condition and the third SOC correction threshold is greater than the preset deviation threshold to obtain a fourth determination result.

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

[0063] SOC 2 ′=SOC M3 -min[ΔSOC 2 2.SOC 3 -SOC 2 ];

[0064] ΔSOC 2 =SOC M3 -SOC 2 |;

[0065] Among them, SOC 2 ′ represents the modified third SOC correction threshold, SOC M3 Indicates the SOC corresponding to the maximum cell voltage that meets the third preset condition, SOC 3 represents the fourth SOC correction threshold, ΔSOC 2 Indicates the absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the third preset condition and the third SOC correction threshold; the fourth SOC correction threshold is set to the charging cut-off SOC according to the project, and no adaptive correction is performed subsequently.

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

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

[0068] As an optional implementation manner, determining whether the battery module has been fully charged during the last charging process to obtain a first determination result specifically includes:

[0069] Determine whether the maximum single cell voltage at the end of the last charging process has reached the charging cut-off voltage.

[0070] If the maximum single cell voltage at the end of the last charging process reaches the charging cut-off voltage, it is determined that the battery module has been fully charged during the last charging process, otherwise it is determined that the battery module has not been fully charged during the last charging process.

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

[0072] As an optional implementation manner, the initial value of the first SOC correction threshold, the initial value of the second SOC correction threshold, and the initial value of the third SOC correction threshold are all obtained through a standard discharge test.

[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. 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 charge cut-off voltage.

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

[0075] The present application also provides an application scenario, which applies the above-mentioned method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery. Specifically: the method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery provided in this embodiment can be applied in the scenario of electric vehicle charging management. The scenario includes a battery monitoring link, an SOC estimation link, and a charging strategy adjustment link; the electric vehicle enters the charging process from the battery monitoring link, obtains the corresponding battery status information through real-time monitoring of the maximum single cell voltage and the SOC estimation method of the battery module, and enters the charging strategy adjustment link. The method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery provided in this embodiment belongs to the SOC correction threshold adjustment link in the charging strategy adjustment link. Specifically, at the end of the battery module during the charging process, the SOC correction threshold can be adaptively adjusted based on the matching of the maximum single cell voltage monitored in real time with the 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, the embodiment of the present application also provides a device for implementing the above-mentioned SOC multi-point correction threshold adaptive adjustment device for the charging terminal of a lithium iron phosphate battery. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of one or more SOC multi-point correction threshold adaptive adjustment devices for the charging terminal of a lithium iron phosphate battery provided below can refer to the limitations of the SOC multi-point correction threshold adaptive adjustment method for the charging terminal of a lithium iron phosphate battery above, and will not be repeated here.

[0077] In an exemplary embodiment, Figure 3 As shown, a device for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal is provided, comprising:

[0078] A full charge correction judgment module 301 is used to judge whether the battery module has been fully charged during the last charging process, and obtain a first judgment result;

[0079] The first correction module 302 of the correction threshold is used to monitor the maximum cell voltage of the battery module in real time during the current charging process if the first judgment result is yes. When the maximum cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the first preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; the first preset condition is that the maximum cell voltage is greater than or equal to the preset cell voltage value, and the change in the maximum cell voltage within the preset time period is not greater than the preset cell pressure difference value; the second preset condition is that the maximum cell voltage is equal to the first correction voltage; the third preset condition is that the maximum 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 cut-off voltage;

[0080] The second correction module 303 of 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 no, and 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 fourth preset condition is that the maximum single cell voltage is equal to the inflection point voltage.

[0081] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store SOC multi-point correction threshold processing data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for adaptively adjusting the SOC multi-point correction threshold at the charging end of a lithium iron phosphate battery is implemented.

[0082] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0083] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0084] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[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, stored data, displayed data, 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 relevant data must comply with relevant regulations.

[0086] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present 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 may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0087] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0088] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery, characterized in that: The method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery comprises: Determine whether the battery module has been fully charged during the last charging process, and obtain a first determination result; If the first judgment result is yes, the maximum cell voltage of the battery module is monitored in real time during the current charging process. When the maximum cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the first preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; the first preset condition is that the maximum cell voltage is greater than or equal to the preset cell voltage value, and within the preset time period, the change in the maximum cell voltage is not greater than the preset cell pressure difference value; the second preset condition is that the maximum cell voltage is equal to the first correction voltage; the third preset condition is that the maximum 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 cut-off voltage; If the first judgment result is no, the maximum cell voltage of the battery module is monitored in real time during the current charging process. When the maximum cell voltage meets the fourth preset condition, the first SOC correction threshold is corrected according to the maximum cell voltage that meets the fourth preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected according to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected according to the maximum cell voltage that meets the third preset condition; the fourth preset condition is that the maximum cell voltage is equal to the inflection point voltage.

2. The method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery according to claim 1, characterized in that: The first SOC correction threshold is corrected according to the maximum 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 cell voltage that meets the fourth preset condition and the first SOC correction threshold is greater than a preset deviation threshold, and obtain a second determination result; If the second judgment result is yes, the first SOC correction threshold is corrected using the following formula; SOC0′=SOC M4 -min[ΔSOC 0 2,SOC1-SOC0]; ΔSOC0=|SOC M4 -SOC0|; Wherein, SOC0′ represents the first SOC correction threshold after correction, SOC M4 represents the SOC corresponding to the maximum cell voltage that meets the fourth preset condition, SOC0 represents the first SOC correction threshold, SOC1 represents the second SOC correction threshold, ΔSOC0 represents the absolute value of the difference between the SOC corresponding to the maximum cell voltage that meets the fourth preset condition and the first SOC correction threshold; If the second judgment result is no, the first SOC correction threshold is not corrected.

3. The method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery according to claim 1, characterized in that: Determine whether the battery module has been fully charged during the last charging process, and obtain a first determination result, specifically including: Determine whether the maximum single cell voltage at the end of the last charging process has reached the charging cut-off voltage; If the maximum single cell voltage at the end of the last charging process reaches the charging cut-off voltage, it is determined that the battery module has been fully charged during the last charging process, otherwise it is determined that the battery module has not been fully charged during the last charging process.

4. The method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery according to claim 1, characterized in that: The initial value of the first SOC correction threshold, the initial value of the second SOC correction threshold, and the initial value of the third SOC correction threshold are all obtained through a standard discharge test.

5. The method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery according to claim 1, characterized in that: The initial value of the knee 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 method for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery 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 pressure difference value is 5mV.

7. A device for adaptively adjusting the SOC multi-point correction threshold at the charging terminal of a lithium iron phosphate battery, characterized in that: The lithium iron phosphate battery charging terminal SOC multi-point correction threshold adaptive adjustment device comprises: A full charge correction judgment module is used to judge whether the battery module has been fully charged during the last charging process, and obtain a first judgment result; The first correction module of the correction threshold is used for real-time monitoring the maximum cell voltage of the battery module in the current charging process if the first judgment result is yes. When the maximum cell voltage meets the first preset condition, the inflection point voltage is corrected to the maximum cell voltage that meets the first preset condition, and the first SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the first preset condition; when the maximum cell voltage meets the second preset condition, the second SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the second preset condition; when the maximum cell voltage meets the third preset condition, the third SOC correction threshold is corrected to the SOC corresponding to the maximum cell voltage that meets the third preset condition; the first preset condition is that the maximum cell voltage is greater than or equal to the preset cell voltage value, and within the preset time period, the change of the maximum cell voltage is not greater than the preset cell pressure difference value; the second preset condition is that the maximum cell voltage is equal to the first correction voltage; the third preset condition is that the maximum 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 cut-off voltage; The second correction module of the correction threshold is used for monitoring the maximum single cell voltage of the battery module in real time during the current charging process if the first judgment result is no; 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 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, wherein the processor executes the computer program to implement the method for adaptively adjusting the SOC multi-point correction threshold of a lithium iron phosphate battery charging terminal as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for adaptively adjusting the SOC multi-point correction threshold of the charging terminal of a lithium iron phosphate battery according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for adaptively adjusting the SOC multi-point correction threshold of the charging terminal of a lithium iron phosphate battery according to any one of claims 1 to 6 is implemented.

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