SOC correction method and system of lithium iron phosphate battery and vehicle

Abstract

The invention provides an SOC correction method of a lithium iron phosphate battery, which comprises the following steps of: acquiring battery standing time, judging whether the battery standing time reaches a correction threshold value or not, and determining a target SOC-OCV curve based on a battery state condition under the condition that the battery standing time reaches the correction threshold value; determining an SOC correctable range on the target SOC-OCV curve based on the battery standing time; and correcting the SOC value of the battery based on the current open circuit voltage (OCV) value of the battery, the current SOC display value and the determined SOC correctable range. According to the SOC correction method of the lithium iron phosphate battery, the characteristic that the longer the standing time of the battery is, the larger the correctable SOC range of an open-circuit voltage method is utilized, the correctable SOC range can be properly selected on an SOC-OCV curve according to the standing time of the battery, and particularly, the correctable SOC range is expanded under the condition of long standing time, so that the correctable SOC range can be properly selected on the SOC-OCV curve. And corresponding SOC correction is carried out, so that the accuracy of the SOC of the battery is improved. The invention also provides a corresponding computer program product, a system and a vehicle.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a method for correcting the state of charge (SOC) of a lithium iron phosphate battery, a system for correcting the SOC of a lithium iron phosphate battery, a computer program product, and a corresponding vehicle. Background Technology

[0002] Lithium iron phosphate batteries have become one of the main energy sources for electric and hybrid vehicles due to their high safety, high power density, low raw material cost, and environmental friendliness. Estimating the state of charge (SOC) of lithium iron phosphate batteries is one of the core tasks of the battery management system. Its accuracy will determine the battery's efficiency and safety, and ultimately affect the user's driving experience.

[0003] Currently, commonly used battery SOC estimation methods include the Open Circuit Voltage (OCV) method. After a battery has been idle for a long time, a relatively stable correlation exists between the OCV and SOC. Therefore, the battery's SOC can be estimated by referring to a pre-calibrated SOC-OCV curve, taking into account factors such as current, temperature, and voltage. However, this method has a drawback: the allowable correction range is fixed. This may lead to the correction range not being maximized as the vehicle or battery's idle time increases, limiting the correction to a lower SOC instead of a more accurate one. On the other hand, if the vehicle or battery's idle time is insufficient, the SOC may be incorrectly corrected, resulting in a higher corrected SOC than the true value.

[0004] It is evident that existing technologies still require more effective correction methods for the SOC of lithium iron phosphate batteries to improve the accuracy of SOC estimation. Summary of the Invention

[0005] The purpose of this invention is to provide a SOC correction method for lithium iron phosphate batteries, a SOC correction system for lithium iron phosphate batteries, a computer program product, and a corresponding vehicle, so as to at least partially solve the technical problems existing in the prior art.

[0006] According to a first aspect of the present invention, a method for correcting the state of charge (SOC) of a lithium iron phosphate battery is provided, comprising:

[0007] Obtain the battery rest time and determine whether the battery rest time has reached the correction threshold.

[0008] When the battery resting time reaches the correction threshold:

[0009] Determine the target SOC-OCV curve based on battery state conditions;

[0010] Determine the correctable range of SOC on the target SOC-OCV curve based on battery resting time; and

[0011] The battery's SOC value is adjusted based on the battery's current open-circuit voltage (OCV), the current displayed SOC value, and the determined correctable range of SOC.

[0012] In one exemplary embodiment, determining the correctable range of SOC on the target SOC-OCV curve based on battery resting time includes determining the correctable range of SOC as the first correctable range on the target SOC-OCV curve when the battery resting time is greater than a first time threshold and less than a second time threshold.

[0013] In one exemplary embodiment, determining the correctable range of SOC on the target SOC-OCV curve based on battery resting time includes, when the battery resting time is greater than a second time threshold, determining the correctable range of SOC as a second correctable range on the target SOC-OCV curve that is larger than the first correctable range.

[0014] In one exemplary embodiment, the SOC correctable range is located in the non-plateau region of low SOC on the target SOC-OCV curve.

[0015] In one exemplary embodiment, the correction threshold is equal to the first time threshold.

[0016] In an exemplary embodiment, the maximum OCV value of the first correctable range is the initial OCV value of the plateau region on the target SOC-OCV curve minus a first voltage margin value, and the maximum OCV value of the second correctable range is the initial OCV value of the plateau region on the target SOC-OCV curve minus a second voltage margin value, wherein the second voltage margin value is less than the first voltage margin value.

[0017] In one exemplary embodiment, correcting the battery's SOC based on the battery's current open-circuit voltage (OCV) value, the current displayed SOC value, and the determined correctable range of SOC includes correcting the SOC value to the SOC value corresponding to the OCV value on the target SOC-OCV curve when the battery's current OCV value corresponds to an OCV value within the correctable range of SOC.

[0018] In one exemplary embodiment, correcting the battery's SOC based on the battery's current open-circuit voltage (OCV) value, the current displayed SOC value, and the determined SOC correctable range includes correcting the SOC value to the SOC value corresponding to the maximum OCV value within the SOC correctable range on the target SOC-OCV curve when the battery's current OCV value is greater than the maximum OCV value within the SOC correctable range, and the current displayed SOC value corresponds to the SOC value within the SOC correctable range.

[0019] In one exemplary embodiment, the battery state conditions include the battery charge / discharge state, the temperature conditions of the battery, the battery SOH value, and historical battery operating condition information.

[0020] In one exemplary embodiment, the correction threshold depends at least on the temperature conditions of the battery.

[0021] According to a second aspect of the present invention, a computer program product, particularly a computer-readable program carrier, is provided, the computer program product including or storing computer program instructions, which, when executed by a processor, enable the processor to at least assist in executing the SOC correction method for lithium iron phosphate batteries according to the first aspect of the present invention.

[0022] According to a third aspect of the present invention, a SOC correction system for a lithium iron phosphate battery is provided, comprising: a controller including a memory and a processor, the memory storing computer program instructions, wherein when the computer program instructions are executed by the processor, the processor is capable of at least assisting in the execution of the SOC correction method for a lithium iron phosphate battery according to the first aspect of the present invention.

[0023] In one exemplary embodiment, the SOC correction system for the lithium iron phosphate battery further includes:

[0024] The correction judgment module is configured to obtain the battery rest time and determine whether the battery rest time has reached the correction threshold.

[0025] The target curve selection module is configured to, when the correction judgment module determines that the battery resting time has reached the correction threshold, acquire battery state condition information and determine the target SOC-OCV curve based on the battery state condition.

[0026] The correction range determination module is configured to determine the correctable range of SOC on the target SOC-OCV curve based on the battery resting time.

[0027] The SOC correction module is configured to correct the battery's SOC value based on the battery's current open-circuit voltage (OCV) value, the current displayed SOC value, and the determined SOC correction range.

[0028] According to a fourth aspect of the invention, a vehicle is provided that includes a SOC correction system for a lithium iron phosphate battery according to a third aspect of the invention.

[0029] The beneficial effects of the present invention according to the above aspects are that, when the battery resting time reaches the correction threshold, the correctable range of SOC on the target SOC-OCV curve can be determined based on the battery resting time, thereby correcting the battery SOC within a small range with a short resting time and correcting the battery SOC within a larger range with a longer resting time, thereby maximizing the accuracy of battery SOC, improving battery efficiency and safety, and ultimately enhancing the user's driving experience. Attached Figure Description

[0030] The invention will now be described in more detail with reference to the accompanying drawings, which will provide a better understanding of its principles, features, and advantages. The drawings include:

[0031] Figure 1 A flowchart illustrating a method for correcting the state of charge (SOC) of a lithium iron phosphate battery according to an exemplary embodiment of the present invention is shown schematically.

[0032] Figure 2 An OCV-SOC curve is provided to illustrate the determination of the correctable SOC range of a lithium iron phosphate battery SOC correction method according to an exemplary embodiment of the present invention.

[0033] Figure 3 An OCV-SOC curve is provided to illustrate a specific correction example of a SOC correction method for a lithium iron phosphate battery according to an exemplary embodiment of the present invention.

[0034] Figure 4 A block diagram of a SOC correction system for a lithium iron phosphate battery according to an exemplary embodiment of the present invention is shown schematically. Detailed Implementation

[0035] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0036] Figure 1 A flowchart illustrating a method for correcting the state of charge (SOC) of a lithium iron phosphate battery according to an exemplary embodiment of the present invention is shown schematically. Figure 1 As shown, a method for correcting the state of charge (SOC) of a lithium iron phosphate battery according to an exemplary embodiment of the present invention includes at least the following steps:

[0037] S1: Obtain the battery resting time and determine whether the battery resting time has reached the correction threshold.

[0038] S2: When the battery resting time reaches the correction threshold:

[0039] S21: Determine the target SOC-OCV curve based on battery state conditions;

[0040] S22: Determine the correctable range of SOC on the target SOC-OCV curve based on battery resting time; and

[0041] S23: Adjust the battery's SOC value based on the battery's current open-circuit voltage (OCV) value, the current displayed SOC value, and the determined SOC correction range.

[0042] In step S1, the correction threshold depends at least on the temperature conditions of the battery. For example, at room temperature, the correction threshold can be 2 hours; at low temperatures, the correction threshold can be a longer value, such as 2.5 hours; conversely, at high temperatures, the correction threshold can be, for example, 1.5 hours. When the obtained battery resting time indicates that the battery has been resting for longer than the correction threshold, proceed to step S2.

[0043] First, in sub-step S21 of step S2, the target SOC-OCV curve is determined based on the battery state conditions. The battery's SOC-OCV curve varies due to factors such as temperature, SOH state, and historical operating conditions (charge / discharge rate). Therefore, a suitable SOC-OCV curve needs to be selected based on the current battery temperature conditions, battery SOH value, and historical battery operating condition information. Furthermore, depending on the battery's current charge / discharge state, corresponding charging and discharging SOC-OCV curves also need to be selected. Figure 2 and Figure 3 The diagram schematically illustrates three different SOC-OCV curves A, B, and C for a battery. Here, it is assumed that curve A is the selected target charging SOC-OCV curve, curve B is the selected target discharging SOC-OCV curve, and curve C is an example of an SOC-OCV curve corresponding to another battery state.

[0044] After determining the target SOC-OCV curve, in sub-step S22, the correctable range of SOC on the target SOC-OCV curve is determined based on the battery resting time. It's important to note that when the vehicle discharges to a low SOC, the accuracy of SOC estimation typically decreases due to factors such as battery characteristics, system measurement errors, and algorithm limitations. Therefore, this paper primarily focuses on correcting the SOC for low SOC conditions; that is, the correctable range of SOC lies within the non-plateau region of the low SOC on the target SOC-OCV curve.

[0045] Specifically, two time thresholds are set: a first time threshold T1 and a second time threshold T2. In a preferred example, a correction threshold is used as the first time threshold T1; conversely, the correction threshold can be equal to the first time threshold T1, while the first time threshold T1 is less than the second time threshold T2. When the battery resting time is greater than the first time threshold T1 and less than the second time threshold T2, the correctable SOC range is determined as the first correctable range on the target SOC-OCV curve. Figure 2 The range shown is between the intersection of the sloping line indicated by T1 and each SOC-OCV curve, and the 0% SOC of the corresponding SOC-OCV curve. For convenience, this range will be referred to as the T1 segment in the examples below. When the battery resting time is greater than the second time threshold T2, the correctable SOC range is determined to be a second correctable range on the target SOC-OCV curve that is larger than the first correctable range. Figure 2 The range shown is between the intersection of the sloping line indicated by T2 and each SOC-OCV curve, and the 0% SOC of the corresponding SOC-OCV curve. For convenience, this range will be referred to as the T2 segment in the examples below. In one example, the first time threshold T1 is, for example, not less than 2 hours, and the second time threshold is, for example, not less than 8 hours.

[0046] Figure 2 The diagonal lines indicated by the symbols T1 and T2 representing time thresholds are only used to schematically show the endpoints of the first and second correctable ranges and their relationship with the first and second time thresholds T1 and T2, and have no other practical meaning. In reality, the first and second correctable ranges are defined based on the characteristics of the SOC-OCV curve itself. Specifically, as... Figure 2As shown, taking curve B as an example, the maximum OCV value of the first correctable range (approximately 3.268V) is the initial OCV value of the plateau region on curve B (approximately 3.288V) minus the first voltage margin value m1. The maximum OCV value of the second correctable range (approximately 3.275V) is the initial OCV value of the plateau region on curve B minus the second voltage margin value m2. Clearly, the second voltage margin value m2 is less than the first voltage margin value m1. The selection of the first and second voltage margin values ​​m1 and m2 here takes into account factors such as sampling and software errors. In this example, the first voltage margin value m1 is, for example, approximately 20mV, and the second voltage margin value m2 is, for example, approximately 15mV. Of course, other values ​​can also be appropriately selected, as long as a suitable SOC correctable range can be obtained. For curves A, C, and all other curves not shown, the SOC correctable range corresponding to each time threshold T1 and T2 can be determined in this way. The method according to the present invention is not limited to using only two time thresholds and their corresponding two correctable ranges. A third, fourth or even more time thresholds can be designed according to actual needs, and more SOC correctable ranges can be divided accordingly, so as to achieve the purpose of finely correcting the SOC of lithium iron phosphate batteries.

[0047] After determining the correctable SOC range, in sub-step S23, the battery's SOC value is corrected based on the current open-circuit voltage (OCV) value, the current displayed SOC value, and the determined correctable SOC range. Specifically, when the battery's current OCV value corresponds to an OCV value within the correctable SOC range, the SOC value is corrected to the SOC value corresponding to the OCV value on the target SOC-OCV curve. Alternatively, when the battery's current OCV value is greater than the maximum OCV value within the correctable SOC range, and the current displayed SOC value corresponds to an SOC value within the correctable SOC range, the SOC value is corrected to the SOC value corresponding to the maximum OCV value within the correctable SOC range on the target SOC-OCV curve.

[0048] The following is combined Figure 3 The examples shown illustrate this point. In one example, such as... Figure 3 As shown, when the battery's current OCV value and current SOC display value correspond to Figure 3The ordinates and abscissas of point P1 are used to determine the SOC-OCV curve. When the battery's resting time exceeds the first time threshold T1 and the battery is in a discharging state, curve B is selected as the target SOC-OCV curve, and the correctable SOC range is the T1 segment on curve B. At this time, the battery's OCV value corresponds to the OCV value within the correctable T1 segment of curve B. Therefore, the SOC value is corrected from the current value corresponding to point P1 (approximately 24% SOC) to the SOC value within the T1 segment of curve B corresponding to the OCV value (approximately 25% SOC). Obviously, this adjustment is also performed when the battery's resting time exceeds the second time threshold T2. Similarly, for point P1, when the battery resting time is greater than the first time threshold T1 and the battery is in a charging state, curve A is selected as the target SOC-OCV curve and the SOC correction range is the T1 segment on curve A. At this time, the battery's OCV value corresponds to the OCV value within the correction range T1 segment on curve A. Therefore, the SOC value is corrected from the current value corresponding to point P1 (approximately 24% SOC) to the SOC value within the T1 segment corresponding to the OCV value on curve A (approximately 16% SOC).

[0049] In another example, when the battery's current OCV value and current SOC display value correspond to Figure 3 For point P2, when the battery's resting time is greater than the first time threshold T1 and less than the second time threshold T2, and the battery is in a discharging state, curve B is selected as the target SOC-OCV curve, and the SOC correction range is the T1 segment on curve B. At this time, the OCV value of point P2 is greater than the maximum OCV value within the T1 segment, but its displayed SOC value corresponds to the SOC value within the T1 segment. Therefore, the SOC value of point P2 (approximately 24% SOC) is corrected to the SOC value corresponding to the maximum OCV value within the T1 segment on curve B (approximately 27% SOC). The same applies when the battery's resting time is greater than the second time threshold T2; that is, the SOC value of point P2 is corrected to the SOC value corresponding to the maximum OCV value within the T2 segment on curve B (approximately 29% SOC). Similarly, for point P2, when the battery's resting time exceeds the first time threshold T1 and the battery is charging, curve A is selected as the target SOC-OCV curve, and the correctable SOC range is the T1 segment on curve A. At this time, the battery's OCV value corresponds to the OCV value within the correctable T1 segment of curve A. Therefore, the SOC value is corrected from the current value at point P2 (approximately 24% SOC) to the SOC value within the T1 segment of curve A corresponding to its OCV value (approximately 19% SOC). Clearly, this adjustment is also performed when the battery's resting time exceeds the second time threshold T2.

[0050] In yet another example, when the battery's current OCV value and current SOC display value correspond to Figure 3For point P3, when the battery's resting time is greater than the first time threshold T1 and less than the second time threshold T2, and the battery is in a discharging state, curve B is selected as the target SOC-OCV curve, and the SOC correction range is the T1 segment on curve B. At this time, the OCV value of point P3 is greater than the maximum OCV value within the T1 segment, but its displayed SOC value corresponds to the SOC value within the T1 segment. Therefore, the SOC value of point P3 (approximately 21% SOC) is corrected to the SOC value corresponding to the maximum OCV value within the T1 segment on curve B (approximately 27% SOC). The same applies when the battery's resting time is greater than the second time threshold T2; that is, the SOC value of point P3 is corrected to the SOC value corresponding to the maximum OCV value within the T2 segment on curve B (approximately 29% SOC). Similarly, for point P3, when the battery's resting time is greater than the first time threshold T1 but less than the second time threshold T2, and the battery is charging, curve A is selected as the target SOC-OCV curve, and the correctable SOC range is the T1 segment on curve A. At this time, the battery's OCV value is greater than the OCV value within the correctable T1 segment on curve A, and its displayed SOC value is also outside the T1 segment. Therefore, the method according to the embodiment of the invention is not used to correct the SOC value of point P3, or it is not corrected at all. Furthermore, when the battery's resting time is greater than the second time threshold T2, the correctable SOC range becomes the T2 segment on curve A. At this time, the OCV value of point P3 corresponds to the OCV value within the correctable T2 segment on curve A. Therefore, the SOC value is corrected from the current value corresponding to point P3 (approximately 21% SOC) to the SOC value within the T2 segment corresponding to its OCV value on curve A (approximately 22% SOC).

[0051] As mentioned in the examples above, when the current OCV value and SOC display value of the battery are both outside the correctable range of SOC on the target SOC-OCV curve, it is not necessary to correct its SOC, or other known suitable methods can be used to correct its SOC. This article will not elaborate on these comparisons.

[0052] In addition, such as Figure 1 As shown, the SOC correction method for a lithium iron phosphate battery according to an exemplary embodiment of the present invention may further include step S3: when the battery resting time is not greater than the correction threshold or not greater than the first time threshold T1, the SOC is not corrected, or other known suitable methods are used to correct the SOC.

[0053] The above description, with reference to multiple examples, illustrates a method for correcting the SOC of a lithium iron phosphate battery according to an embodiment of the present invention. Using this method, the correctable range of SOC on the target SOC-OCV curve can be determined based on the battery's resting time. This allows for correction of the battery SOC within a small range with short resting times and within a larger range with longer resting times, thereby maximizing the accuracy of the battery SOC, improving battery efficiency and safety, and ultimately enhancing the user's driving experience.

[0054] The present invention also provides a computer program product, particularly a computer-readable program carrier, the computer program product including or storing computer program instructions, which, when executed by a processor, enable the processor to at least assist in executing the SOC correction method for lithium iron phosphate batteries according to embodiments of the present invention.

[0055] like Figure 4 As shown, the present invention also provides a SOC correction system 1 for lithium iron phosphate batteries, which includes a controller 10. The controller 10 may include a memory and a processor. The memory stores computer program instructions. When the computer program is executed by the processor, the processor is able to execute, for example, or at least assist in executing the SOC correction method for lithium iron phosphate batteries described in the embodiments of the present invention. The computer program product may be stored in a computer-readable storage medium. The computer-readable storage medium may include, for example, high-speed random access memory, and may also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart memory card, secure digital card, flash memory card, at least one disk storage device, flash memory device, or other volatile solid-state storage device. The processor may be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, off-the-shelf programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The controller 10 may be a dedicated controller for the SOC correction method of lithium iron phosphate batteries according to embodiments of the present invention, or it may be integrated into the vehicle controller (VCU) of a vehicle, or the controller 10 may be implemented as the vehicle controller (VCU).

[0056] The SOC correction system 1 for a lithium iron phosphate battery according to an exemplary embodiment of the present invention may further include: a correction judgment module 20 configured to acquire the battery resting time and determine whether the battery resting time has reached a correction threshold; a target curve selection module 30 configured to acquire battery state condition information and determine a target SOC-OCV curve based on the battery state conditions when the correction judgment module 20 determines that the battery resting time has reached the correction threshold; a correction range determination module 40 configured to determine the correctable SOC range on the target SOC-OCV curve based on the battery resting time; and a SOC correction module 50 configured to correct the battery's SOC value based on the battery's current open-circuit voltage OCV value, the current displayed SOC value, and the determined correctable SOC range.

[0057] The present invention also provides a vehicle comprising the SOC correction system 1 of the lithium iron phosphate battery according to the present invention.

[0058] Although specific embodiments of the invention have been described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications can be conceived without departing from the spirit and scope of the invention.

Claims

1. A method for correcting the state of charge (SOC) of a lithium iron phosphate battery, comprising: Obtain the battery rest time and determine whether the battery rest time has reached the correction threshold. When the battery resting time reaches the correction threshold: Determine the target SOC-OCV curve based on battery state conditions; Determine the correctable range of SOC on the target SOC-OCV curve based on battery resting time; and The battery's SOC value is adjusted based on the battery's current open-circuit voltage (OCV), the current displayed SOC value, and the determined correctable range of SOC.

2. The SOC correction method for lithium iron phosphate batteries according to claim 1, wherein, The correctable range of SOC on the target SOC-OCV curve, determined based on battery resting time, includes: If the battery resting time is greater than a first time threshold but less than a second time threshold, the correctable SOC range is determined as the first correctable range on the target SOC-OCV curve; or If the battery resting time is greater than the second time threshold, the SOC correctable range is determined to be a second correctable range on the target SOC-OCV curve that is larger than the first correctable range.

3. The SOC correction method for lithium iron phosphate batteries according to claim 2, wherein, The SOC correction range is located in the non-plateau region of low SOC on the target SOC-OCV curve; and / or The correction threshold is equal to the first time threshold.

4. The SOC correction method for lithium iron phosphate batteries according to claim 2 or 3, wherein, The maximum OCV value of the first correctable range is the initial OCV value of the plateau region on the target SOC-OCV curve minus the first voltage margin value. The maximum OCV value of the second correctable range is the initial OCV value of the plateau region on the target SOC-OCV curve minus the second voltage margin value, where the second voltage margin value is less than the first voltage margin value.

5. The SOC correction method for lithium iron phosphate batteries according to any one of claims 1 to 4, wherein, The SOC of the battery is corrected based on the current open-circuit voltage (OCV) value, the current displayed SOC value, and the determined correctable SOC range, including: When the current OCV value of the battery corresponds to an OCV value within the correctable range of the SOC, the SOC value is corrected to the SOC value corresponding to the OCV value on the target SOC-OCV curve; or When the current OCV value of the battery is greater than the maximum OCV value within the correctable range of SOC, and the current SOC display value corresponds to the SOC value within the correctable range of SOC, the SOC value is corrected to the SOC value corresponding to the maximum OCV value within the correctable range of SOC on the target SOC-OCV curve.

6. The SOC correction method for lithium iron phosphate batteries according to any one of claims 1 to 5, wherein, The battery condition conditions include the battery charge / discharge status, the temperature conditions of the battery, the battery SOH value, and / or historical battery operating information; and / or The correction threshold depends at least on the temperature conditions of the battery.

7. A computer program product, particularly a computer-readable program carrier, the computer program product including or storing computer program instructions, wherein when the computer program instructions are executed by a processor, the processor is capable of at least assisting in the execution of the SOC correction method for a lithium iron phosphate battery according to any one of claims 1-6.

8. A SOC correction system (1) for a lithium iron phosphate battery, comprising: The controller (10) includes a memory and a processor, the memory storing computer program instructions, which, when executed by the processor, are capable of at least assisting in the execution of the SOC correction method for lithium iron phosphate batteries according to any one of claims 1-6.

9. The SOC correction system (1) for a lithium iron phosphate battery according to claim 8, further comprising: The correction judgment module (20) is configured to obtain the battery rest time and determine whether the battery rest time has reached the correction threshold. The target curve selection module (30) is configured to obtain battery state condition information and determine the target SOC-OCV curve based on the battery state condition when the correction judgment module determines that the battery resting time has reached the correction threshold. Correction range determination module (40) is configured to determine the correctable range of SOC on the target SOC-OCV curve based on battery resting time; The SOC correction module (50) is configured to correct the SOC value of the battery based on the current open-circuit voltage (OCV) value of the battery, the current SOC display value, and the determined SOC correction range.

10. A vehicle comprising a SOC correction system for a lithium iron phosphate battery according to claim 8 or 9.

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