Battery charge state correction method, battery equalization method, equipment and vehicle

Abstract

The embodiment of the invention provides a battery state of charge (SOC) correction method, a battery equalization method, equipment and a vehicle, and the method comprises the steps: obtaining the SOC of a battery; when the voltage change of the battery is greater than or equal to a preset value, correcting the current SOC of the battery according to the current SOC, the ratio of the electric quantity change corresponding to the voltage change to the voltage change and a pre-generated correction reference table; wherein the correction reference table comprises the range of at least one correction area and the SOC value of a correction point in the correction area, and the range of the correction area is determined according to the position of the correction point on a relation curve between the ratio of the electric quantity change to the voltage change of the battery during testing and the SOC. Therefore, the SOC of the battery can be flexibly and accurately corrected, and the error of the SOC is reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle batteries, and in particular to a method for correcting the state of charge of a battery, a method for equalizing the battery charge, an apparatus, and a vehicle. Background Technology

[0002] Power batteries are a key component of new energy vehicles, and their lifespan directly affects user operating costs and overall vehicle performance. Among power batteries, lithium-ion batteries are one of the most widely used types, including lithium iron phosphate batteries, lithium manganese oxide batteries, lithium cobalt oxide batteries, and ternary lithium batteries. Lithium iron phosphate (LFP) batteries, in particular, are widely used in new energy vehicles due to their high safety, long cycle life, and low cost.

[0003] SOC (state of charge) represents the battery's state of charge and is a key indicator of a power battery system. It is widely used in vehicle control strategies, driving range estimation, and other applications.

[0004] Currently, one method for calculating the SOC of a battery is the ampere-hour integration method. Taking lithium iron phosphate batteries as an example, it uses the relationship curve between the state of charge (SOC) and open circuit voltage (OCV) of lithium iron phosphate batteries to estimate the SOC of the battery. Another method is to use Kalman filtering to dynamically calculate the SOC, that is, to establish a first-order or second-order equation for the power battery, calibrate the coefficients of the equation through experiments, and then calculate the SOC in real time.

[0005] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention.

[0006] The inventors discovered that existing methods for calculating State of Charge (SOC) using the ampere-hour integration method or Kalman filtering have significant errors. For example, taking the ampere-hour integration method applied to lithium iron phosphate (LFP) batteries, when the LFP battery is charged to a specific SOC range, the SOC-OCV relationship curve appears as a straight line parallel to the axis representing SOC, while the corresponding OCV remains unchanged. Therefore, at least within this specific SOC range, it is difficult to determine the exact SOC, leading to a large error. Moreover, with continued use of the ampere-hour integration method, the error in the calculated SOC will gradually increase.

[0007] Existing technologies include methods for correcting the State of Charge (SOC) calculated using ampere-hour integration or Kalman filtering, such as using a fixed SOC correction bias (e.g., 3%). However, this correction method, using a single and fixed SOC correction bias, cannot control the error of the corrected SOC within a small range and may even increase the error of the SOC.

[0008] Furthermore, if the SOC error is large, it will have a significant impact on the determination of vehicle control strategy and the estimation of driving range, which may in turn affect the user's judgment and reduce the user experience. Summary of the Invention

[0009] To address one or more of the problems in the prior art, the present invention provides a method for correcting the state of charge (SOC) of a battery, a battery equalization method, an apparatus, and a vehicle, which can flexibly and accurately correct the SOC of a battery and reduce SOC errors.

[0010] According to a first aspect of the present invention, a method for correcting the state of charge (SOC) of a battery is provided, the method comprising:

[0011] Obtain the battery's SOC;

[0012] When the battery voltage change is greater than or equal to a preset value, the current SOC of the battery is corrected based on the current SOC, the ratio of the change in charge to the change in voltage, and a pre-generated correction reference table.

[0013] The correction reference table includes the range of at least one correction region and the SOC value of the correction point within the correction region. The range of the correction region is determined based on the position of the correction point on the curve relating the ratio of battery charge change to voltage change during testing to SOC.

[0014] One of the beneficial effects of this invention is that it allows for real-time correction of the initially determined SOC, effectively reducing the cumulative error of the SOC.

[0015] Furthermore, by correcting the current SOC based on the correction area in the pre-generated correction benchmark table, corrections can be made when necessary, preventing erroneous corrections and further improving the accuracy and reliability of the corrections.

[0016] Furthermore, the range of the correction area in the correction benchmark table is determined based on the position of the correction point on the curve relating the ratio of charge change to voltage change during battery testing to SOC. This ensures the accuracy of the SOC correction results. For example, since the curve relating the ratio of charge change to voltage change during battery testing to SOC can be tested under various conditions, it can reduce or even eliminate the influence of factors such as battery state of health (SOH), temperature, capacity consistency, and charging current type (DC or AC) on SOC correction under actual operating conditions, thereby improving correction accuracy. Compared to existing methods that use a single fixed SOC error value to correct SOC, this method offers greater flexibility and results in a smaller error in the corrected SOC.

[0017] In addition, the battery state of charge (SOC) correction method of the present invention has no limitation on the initial SOC during battery charging and has a wide range of applications.

[0018] In addition, the reduction in SOC error also helps improve the accuracy of operations such as determining vehicle control strategies and estimating driving range, thereby improving the user experience.

[0019] Furthermore, based on the current SOC, the ratio of the change in charge to the change in voltage corresponding to the voltage change, and a pre-generated correction reference table, the current SOC of the battery is corrected, including:

[0020] When the ratio and the current SOC are within a correction zone of the correction reference table, the SOC value at the correction point within the correction zone is determined as the corrected value for the battery's current SOC; and / or

[0021] If the ratio and the current SOC are not within any correction range of the correction reference table, the current SOC of the battery will not be corrected.

[0022] In this way, the SOC can be corrected according to the correction zone when the current SOC is in different correction zones, and the SOC will not be corrected when the current SOC is not in any correction zone, thereby further improving the flexibility, accuracy and reliability of SOC correction.

[0023] Furthermore, based on the current SOC, the ratio of the change in charge to the change in voltage corresponding to the voltage change, and a pre-generated correction reference table, the current SOC of the battery is corrected, including:

[0024] When the ratio and the current SOC are within a correction zone of the correction reference table and the current SOC is within a preset range, the SOC value of the correction point within the correction zone is determined as the correction value of the battery's current SOC; and / or

[0025] If the ratio and the current SOC are not within any correction area of ​​the correction reference table or the current SOC is not within the preset range, the current SOC of the battery will not be corrected.

[0026] In this way, when the current SOC is within the preset range, the SOC is corrected according to the correction zone in which the current SOC is located. This allows for flexible correction of the SOC within a certain range, while further avoiding unsuitable corrections to SOCs that do not need correction, which would increase the error of the SOC.

[0027] Furthermore, the method for correcting the battery state of charge (SOC) also includes generating a correction reference table;

[0028] The steps for generating the revised baseline table include:

[0029] Generate a curve showing the relationship between the ratio of change in charge to change in voltage and SOC;

[0030] At least the correction points should be determined based on the peaks and / or troughs on the relationship curve;

[0031] Determine the correction area based on the location of the correction point;

[0032] A correction benchmark table is generated based on the extent of the correction region and the SOC values ​​of the correction points within the correction region.

[0033] In this way, the correction area is determined based on the correction point, and the corrected SOC value is determined based on the correction area. When the correction points are close in location, or when the correction point corresponding to the same ratio of energy change and voltage change is not unique on the curve of SOC, the correction error can be effectively avoided from increasing or correcting incorrectly.

[0034] Furthermore, the relationship curves between the ratio of charge change to voltage change and SOC include:

[0035] During battery testing, the battery's charge change, voltage change, and SOC after the voltage change are collected under different charging conditions when the voltage change is greater than or equal to a preset value. Based on the collected data on charge change, voltage change, and SOC after the voltage change, a curve showing the relationship between the ratio of charge change to voltage change and SOC is generated.

[0036] The charging conditions include at least one of temperature, battery health status, and battery capacity consistency.

[0037] In this way, the effects of charging conditions such as temperature, battery health status, and battery capacity consistency are taken into account when generating the correction reference table, which can further reduce the error of the corrected SOC.

[0038] Furthermore, there is a first adjacent correction point on the axis representing SOC, and a second adjacent correction point on the axis representing the ratio of charge change to voltage change.

[0039] And the correction area is determined based on the location of the correction point, including:

[0040] The SOC range corresponding to the correction region is determined based on the correction point and the first adjacent correction point; and

[0041] Based on the correction point and the second adjacent correction point, determine the range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction area.

[0042] Therefore, by determining the correction region of a correction point based on other correction points adjacent to the correction point, it is possible to avoid the overlap of correction regions corresponding to different correction points. This avoids situations where the correction region corresponding to a point in the ΔQ / ΔV-SOC coordinate system is not unique, thereby effectively preventing the correction error from increasing or the correction from being incorrect.

[0043] Furthermore, the SOC range corresponding to the correction region is determined based on the correction point and the first adjacent correction point, including:

[0044] The first boundary SOC corresponding to the correction region is determined based on the first SOC of the correction point, the second SOC of the first adjacent correction point, and the average of the first SOC and the second SOC.

[0045] The SOC range corresponding to the correction region is determined based on the first SOC and the first boundary SOC.

[0046] Specifically, based on the correction point and the second adjacent correction point, the range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined, including:

[0047] The first boundary ratio corresponding to the correction region is determined based on the first ratio of the change in charge and voltage at the correction point, the second ratio of the change in charge and voltage at the second adjacent correction point, and the average of the first and second ratios.

[0048] The range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined based on the first ratio and the first boundary ratio.

[0049] Therefore, it is possible to determine non-overlapping correction regions for each correction point, avoiding the inability to determine the current SOC correction value due to the proximity of correction points or the non-uniqueness of correction points, thereby effectively preventing the increase of correction error or correction mistakes.

[0050] Furthermore, the correction point is represented by a correction range, which uses a range of the ratio of charge change to voltage change and a state of charge (SOC) range.

[0051] Therefore, expanding the correction point to a correction range can eliminate the error of the correction point to a certain extent, thereby reducing or even avoiding the increase of correction error or correction mistake caused by the deviation of the correction point position.

[0052] Furthermore, the correction range is obtained by expanding the correction points based on the deviations in capacity or voltage, temperature differences, and degradation differences of each battery cell.

[0053] Therefore, it is possible to reduce or even eliminate the influence of factors such as battery capacity, voltage deviation, temperature difference, and degradation difference on the position of the correction point on the relationship curve between the ratio of charge change and voltage change and SOC, thereby reducing or even avoiding the increase in correction error or correction mistakes caused by the deviation of the correction point position.

[0054] Furthermore, there is a first adjacent correction range on the axis representing SOC, and a second adjacent correction range on the axis representing the ratio of charge change to voltage change.

[0055] And the correction area is determined based on the location of the correction point, including:

[0056] The SOC range corresponding to the correction region is determined based on the correction range and the first adjacent correction range; and

[0057] Based on the correction range and the second adjacent correction range, determine the range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region.

[0058] Therefore, by determining the correction area of ​​a correction range based on other correction ranges adjacent to the correction range, it is possible to avoid the overlap of correction areas corresponding to different correction ranges. This avoids situations where the correction area corresponding to a point in the ΔQ / ΔV-SOC coordinate system is not unique, thereby effectively preventing the correction error from increasing or the correction from being incorrect.

[0059] Furthermore, the SOC range corresponding to the correction region is determined based on the correction range and the first adjacent correction range, including:

[0060] The second boundary SOC corresponding to the correction region is determined based on the third SOC of the correction range, the fourth SOC of the first adjacent correction range, and the average value of the third SOC and the fourth SOC.

[0061] The SOC range corresponding to the correction region is determined based on the third SOC and the second boundary SOC.

[0062] Specifically, based on the correction range and the second adjacent correction range, the range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined, including:

[0063] Based on the third ratio of the change in charge and voltage within the correction range, the fourth ratio of the change in charge and voltage within the first adjacent correction range, and the average of the third and fourth ratios, determine the second boundary ratio of the change in charge and voltage corresponding to the correction region.

[0064] The range of the ratios of the change in electrical quantity and the change in voltage corresponding to the correction region is determined based on the third ratio and the second boundary ratio.

[0065] Therefore, it is possible to determine non-overlapping correction regions for each correction range, avoiding the inability to determine the current SOC correction value due to the proximity of correction ranges or the non-uniqueness of correction ranges, thereby effectively preventing the increase of correction error or correction mistakes.

[0066] Furthermore, methods for correcting the battery state of charge (SOC) also include:

[0067] The current SOC of the battery is not corrected when the ratio and the current SOC are within the overlap range of at least two correction ranges.

[0068] In this way, when the current SOC falls within the overlap of at least two correction ranges, the correction value of the SOC is not unique. Therefore, the current SOC is not corrected, which can effectively avoid increasing the correction error or making a correction mistake.

[0069] According to a second aspect of the present invention, a battery equalization method is provided, wherein the method includes:

[0070] Detect the voltage of each cell in the battery;

[0071] The SOC correction method for any of the batteries provided in the first aspect of the present invention is used to determine the SOC value of each cell.

[0072] The total capacity of each cell is determined based on its SOC value.

[0073] The remaining capacity of each cell is determined based on its total capacity and SOC value.

[0074] When the battery starts up, the cell with the highest remaining capacity is discharged.

[0075] Applying the above-mentioned SOC correction method to battery equalization can accurately obtain the total capacity of each cell based on the SOC of each cell, thereby achieving reliable equalization.

[0076] According to a third aspect of the present invention, a terminal device is provided, wherein the terminal device includes:

[0077] Memory, which is used to store computer programs;

[0078] The processor, when executing a computer program, implements the SOC correction method for any of the batteries provided in the first aspect of the present invention, or implements the battery equalization method provided in the second aspect of the present invention.

[0079] Therefore, by conveniently and quickly implementing the battery SOC correction method and / or battery equalization method of this application, it is beneficial to improve the SOC correction accuracy, reduce SOC error, and achieve reliable equalization.

[0080] According to a fourth aspect of the present invention, a vehicle is provided, wherein the vehicle includes the terminal device provided in the third aspect of the present invention. This enables real-time correction and equalization of the vehicle's battery SOC, which improves the accuracy of operations such as determining the vehicle's control strategy and estimating its driving range, thereby enhancing the user experience.

[0081] Embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings. It should be understood that the embodiments of the present invention are not limited in scope thereto. Within the spirit and scope of the appended claims, embodiments of the present invention include many changes, modifications, and equivalents.

[0082] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0083] It should be emphasized that the term "including / contains / has" as used herein refers to the presence of a feature, whole or component, but does not exclude the presence or addition of one or more other features, wholes or components. Attached Figure Description

[0084] The above and other objects, features and advantages of embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0085] Figure 1 This is a block diagram of a battery state of charge correction method according to an embodiment of the present invention;

[0086] Figure 2 This is a schematic diagram illustrating the steps of generating a correction reference table according to an embodiment of the present invention;

[0087] Figure 3 This is a schematic diagram of the ΔQ / ΔV-SOC relationship curve according to an embodiment of the present invention;

[0088] Figure 4 It is based on Figure 3A schematic diagram of correction points determined by peaks and / or troughs on the relationship curve;

[0089] Figures 5A-5D This is a schematic diagram illustrating the correction range of an embodiment of the present invention;

[0090] Figure 6 This is a schematic diagram of one step in determining the correction region according to an embodiment of the present invention;

[0091] Figures 7A-7B This is a schematic diagram illustrating an embodiment of the modified region of the present invention;

[0092] Figure 8 This is a schematic diagram illustrating another step in determining the correction region according to an embodiment of the present invention;

[0093] Figures 9A-9B This is a schematic diagram of another embodiment of the modified region of the present invention;

[0094] Figure 10 This is a block diagram of the battery equalization method according to an embodiment of the present invention;

[0095] Figure 11 This is a block diagram of a terminal device according to an embodiment of the present invention. Detailed Implementation

[0096] Referring to the accompanying drawings, the foregoing and other features of the invention will become apparent from the following description. Specific embodiments of the invention are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of the invention can be employed. It should be understood that the invention is not limited to the described embodiments, but includes all modifications and equivalents falling within the scope of the appended claims.

[0097] The following description, in conjunction with the accompanying drawings, describes the battery state of charge correction method, battery equalization method, device, and vehicle according to embodiments of this application.

[0098] First aspect of the embodiments

[0099] An embodiment of the first aspect of the present invention provides a method for correcting the state of charge of a battery. Figure 1 This is a block diagram of a method for correcting the state of charge of a battery according to an embodiment of the present invention. Figure 1 As shown, the battery state of charge correction method 100 includes:

[0100] Step 101: Obtain the battery's SOC;

[0101] Step 102: When the battery voltage change is greater than or equal to a preset value, the current SOC of the battery is corrected according to the current SOC, the ratio of the change in charge to the change in voltage, and the pre-generated correction reference table.

[0102] The correction reference table includes the range of at least one correction region and the SOC value of the correction point within that correction region. The range of the correction region is determined based on the position of the correction point on the curve relating the ratio of battery charge change to voltage change during testing to SOC.

[0103] Therefore, the initial SOC is corrected in real time, which effectively reduces the cumulative error of SOC.

[0104] Furthermore, by correcting the current SOC based on the correction area in the pre-generated correction benchmark table, corrections can be made when necessary, preventing erroneous corrections and further improving the accuracy and reliability of the corrections.

[0105] Furthermore, the range of the correction area in the correction benchmark table is determined based on the position of the correction point on the curve relating the ratio of charge change to voltage change during battery testing to SOC. This ensures the accuracy of the SOC correction results. For example, since the curve relating the ratio of charge change to voltage change during battery testing to SOC can be tested under various conditions, it can reduce or even eliminate the influence of factors such as battery state of health (SOH), temperature, capacity consistency, and charging current type (DC or AC) on SOC correction under actual operating conditions, thereby improving correction accuracy. Compared to existing methods that use a single fixed SOC error value to correct SOC, this method offers greater flexibility and results in a smaller error in the corrected SOC.

[0106] In addition, the battery state of charge correction method of the present invention has no limitation on the initial SOC during battery charging and has a wide range of applications.

[0107] In addition, the reduction in SOC error also helps improve the accuracy of operations such as determining vehicle control strategies and estimating driving range, thereby improving the user experience.

[0108] In some embodiments, the battery of the present invention can be applied to various types of batteries, such as lithium-ion batteries, such as lithium iron phosphate batteries (LFP). The present invention does not limit this.

[0109] In some embodiments, the SOC of the battery obtained in step 101 is an initial value or initial range of SOC, which can be determined in various ways.

[0110] In some embodiments, the SOC of the battery in step 101 can be determined using existing methods, such as the ampere-hour integration method or Kalman filtering. However, as mentioned earlier, the SOC calculated using the ampere-hour integration method, Kalman filtering, or other existing methods may have a large error or accumulated error compared to the actual SOC. Therefore, it is necessary to correct the SOC obtained by this method in a timely manner through subsequent steps.

[0111] In some embodiments, obtaining the SOC of the battery in step 101 may not include the process of determining the SOC by existing methods, but may instead involve directly reading, extracting, or receiving the determined current SOC value.

[0112] In some embodiments, in step 101, the battery's SOC can be acquired in real time; or, the SOC can be acquired periodically; or, the SOC can be acquired when preset conditions are met, such as when the voltage change during battery charging is greater than or equal to a preset value. This invention does not limit the scope of the invention.

[0113] In some embodiments, the ratio of charge change to voltage change can be expressed as ΔQ / ΔV, where ΔV is the battery voltage change, and ΔQ is the charge change generated by the battery during the voltage change ΔV. ΔV and its corresponding ΔQ occur within the same time period. ΔQ and ΔV can be detected using existing detection methods, which can be found in relevant prior art; this invention will not elaborate on these methods.

[0114] In some embodiments, when the battery voltage change ΔV is greater than or equal to a preset value, the voltage change ΔV and the corresponding charge change ΔQ are recorded. That is, in the embodiment of the present invention, in ΔQ / ΔV, the value of ΔV is greater than or equal to the aforementioned preset value.

[0115] In some embodiments, the above preset value can be set according to the actual situation, for example, 1mV.

[0116] In some embodiments, in step 102, when the voltage change of the battery is greater than or equal to a preset value, the current SOC, the ratio of the change in charge to the voltage change corresponding to the voltage change, and a pre-generated correction reference table are used.

[0117] In some embodiments, "current SOC" refers to the SOC value at the moment when the battery voltage change ΔV is greater than or equal to a preset value, i.e., the SOC value after the voltage change. The "ratio of charge change to voltage change" corresponding to "current SOC" refers to the ratio of the charge change ΔQ to the voltage change ΔV during the voltage change ΔV, i.e., ΔQ / ΔV. For example, if the battery voltage is detected to be V1 and charge to be Q1 at time t1, and the voltage to be V2 and charge to be Q2 at time t2, and the difference between V2 and V1, ΔV, is greater than or equal to the preset value, then "current SOC" is the SOC at time t2, and the corresponding ΔQ / ΔV is (V2-V1) / (Q2-Q1).

[0118] Regarding time t1, it is one of the reference times for calculating voltage changes. Time t1 can be, for example, the closest time before the current time when a voltage change greater than or equal to a preset value is detected. Similarly, time t2 can also be used as a reference time for detecting voltage changes in the next stage. For example, suppose the battery starts charging at time t0, with a corresponding voltage of V0 (initial voltage of the battery during charging) and a charge of Q0 (initial charge of the battery during charging). During charging, the battery voltage and charge are monitored in real time. First, using time t0 as a reference time, the voltage change is calculated. If at time t1, the detected voltage is V1 and the charge is Q1, and the difference between V1 and the voltage V0 at time t0 is greater than or equal to the aforementioned preset value, then the SOC value at time t1 is taken as the "current SOC" at time t1, and the "current SOC" at time t1 is used to... The corresponding ΔQ / ΔV is (V1-V0) / (Q1-Q0); after time t1, using time t1 as a reference time, the voltage change is calculated. If at time t2, the detected voltage is V2, the charge is Q2, and the difference between V2 and the voltage V1 at time t1 is greater than or equal to the above preset value, then the SOC value at time t2 is taken as the "current SOC" at time t2, and the ΔQ / ΔV corresponding to the "current SOC" at time t2 is (V2-V1) / (Q2-Q1); after time t2, using time t2 as a reference time, the voltage change is calculated... and so on.

[0119] In some embodiments, the correction reference table includes the range of at least one correction region and the SOC value of correction points within the correction region. The range of the correction region is determined based on the position of the correction point on the curve relating the ratio of battery charge change to voltage change during testing to SOC.

[0120] In some embodiments, the correction reference table includes the range of at least one correction region and the State of Charge (SOC) of the correction points within each correction region. Different correction points on the curve relating the ratio of charge change to voltage change to SOC correspond to different correction regions, and the ranges of different correction regions do not overlap. The range of a correction region can be represented, for example, by a range of ΔQ / ΔV and a range of SOC.

[0121] In some embodiments, a correction point is provided within a correction region to ensure the uniqueness of the correction result.

[0122] In some embodiments, the relationship curve between the ratio of charge change and voltage change and SOC can also be represented as a ΔQ / ΔV-SOC relationship curve. The ΔQ / ΔV-SOC relationship curve is determined based on the ratio of charge change and voltage change of the battery during testing and the SOC corresponding to the ratio of charge change and voltage change. The steps for determining the ΔQ / ΔV-SOC relationship curve will be described in subsequent embodiments.

[0123] In the ΔQ / ΔV-SOC relationship curve, the horizontal axis represents the SOC of the battery, and the value of SOC ranges from 0% to 100%. The vertical axis represents ΔQ / ΔV. Alternatively, the horizontal axis can represent ΔQ / ΔV and the vertical axis can represent the SOC of the battery. This invention does not limit this.

[0124] In some embodiments, in step 102, the current SOC of the battery is corrected based on the current SOC, the ratio of the change in charge to the change in voltage corresponding to the voltage change, and a pre-generated correction reference table, including:

[0125] When the ratio and the current SOC are within a correction zone of the correction reference table, the SOC value at the correction point within the correction zone is determined as the corrected value for the battery's current SOC; and / or

[0126] If the ratio and the current SOC are not within any correction range of the correction reference table, the current SOC of the battery will not be corrected.

[0127] In this way, the correction conditions for SOC are limited. The "current SOC" that meets the first correction condition of "the current SOC is within a correction area of ​​the correction reference table" is corrected, while the "current SOC" that does not meet the first correction condition (i.e. is not within any correction area of ​​the correction reference table) is not corrected. This improves the flexibility of SOC correction, avoids incorrect correction of SOCs that are not suitable for correction, and avoids the increase of SOC error.

[0128] Furthermore, for the "current SOC" that meets the first correction condition mentioned above, when it is in different correction regions, the SOC is corrected accordingly to the correction region, which can improve the flexibility and accuracy of SOC correction, thereby further reducing the error between the corrected SOC and the actual SOC.

[0129] For example, suppose that at the current time t1, a voltage change of 1mV or greater is detected in the battery. Based on the ratio ΔQ / ΔV (the change in charge before and after the voltage change) being 100, the current State of Charge (SOC) at this time is 69%. Furthermore, in the correction reference table, there exists a correction region A with an SOC range of 68%–70%, a ΔQ / ΔV range of 80–120, and a correction point within correction region A with an SOC value of 69.5%. Since both the current SOC (69%) and the ΔQ / ΔV value (100) fall within correction region A, the current SOC value can be corrected using the SOC value at the correction point within correction region A, i.e., the current SOC value can be corrected from 69% to 69.5%. The corrected SOC value can then be displayed.

[0130] If the current SOC and its corresponding ΔQ / ΔV are not simultaneously within the same correction region in the correction reference table—for example, if the current SOC and its corresponding ΔQ / ΔV are in different correction regions in the correction reference table, or if neither the current SOC nor its corresponding ΔQ / ΔV is in any correction region in the correction reference table—then the current SOC will not be corrected. In this case, the current SOC value can be displayed.

[0131] In some embodiments, in step 102, the current SOC of the battery is corrected based on the current SOC, the ratio of the change in charge to the change in voltage corresponding to the voltage change, and a pre-generated correction reference table, including:

[0132] When the ratio and the current SOC are within a correction zone of the correction reference table and the current SOC is within a preset range, the SOC value of the correction point within the correction zone is determined as the correction value of the battery's current SOC; and / or

[0133] If the ratio and the current SOC are not within any correction area of ​​the correction reference table or the current SOC is not within the preset range, the current SOC of the battery will not be corrected.

[0134] In this way, the correction conditions for SOC are limited. For a "current SOC" that meets the second correction condition of "within a preset range", if it also meets the first correction condition of "the current SOC is within a correction region of the correction reference table", then the "current SOC" is corrected. For a "current SOC" that does not meet at least one of the above first correction condition (i.e., not in any correction region of the correction reference table) and does not meet the above second correction condition (i.e., not within the preset range), then no correction is made. This improves the flexibility of SOC correction, avoids incorrect correction of SOCs that are not suitable for correction, and avoids the increase of SOC error.

[0135] Furthermore, for the "current SOC" that satisfies the first and second correction conditions mentioned above, when it is in different correction regions, the SOC is corrected accordingly to the correction region, which can improve the flexibility and accuracy of SOC correction, thereby further reducing the error between the corrected SOC and the actual SOC.

[0136] In some embodiments, the above-mentioned preset range can be set according to actual conditions, for example, 65%-95%.

[0137] For example, suppose that at the current time t1, a voltage change of 1mV or greater is detected in the battery. Based on the ratio ΔQ / ΔV (the change in charge before and after the voltage change) being 100, the current State of Charge (SOC) at this time is 69%. Furthermore, the preset range is 65%-95%. In the correction reference table, there exists a correction region A with an SOC range of 68%-70% and a ΔQ / ΔV range of 80-120. The SOC value at the correction point within correction region A is 69.5%. Since the current SOC (69%) is within the preset range (65%-95%), and both the current SOC (69%) and the ΔQ / ΔV value (100) are within correction region A, the current SOC value can be corrected using the SOC value at the correction point within correction region A, i.e., the current SOC value can be corrected from 69% to 69.5%. The corrected SOC value can then be displayed.

[0138] If the current SOC is not within the preset range, or if the current SOC and its corresponding ΔQ / ΔV are not simultaneously within the same correction region in the correction reference table (e.g., the current SOC and its corresponding ΔQ / ΔV are in different correction regions in the correction reference table, or neither the current SOC nor its corresponding ΔQ / ΔV are in any correction region in the correction reference table), then the current SOC will not be corrected. In this case, the current SOC value can be displayed.

[0139] The following is a detailed description of the generation process of the "corrected reference table" in an embodiment of the present invention.

[0140] In addition, the “correction benchmark table” in the embodiments of the present invention can also use other names, such as “SOC correction table”, “correction table”, etc., as long as it is a table used to correct SOC. The embodiments of the present invention do not restrict the name of the table.

[0141] In some embodiments, such as Figure 1 As shown, the method for correcting the battery state of charge (SOC) also includes:

[0142] Step 103: Generate the correction benchmark table.

[0143] Since the correction reference table is pre-generated, step 103 can be executed alone or in advance. That is, the battery state-of-charge correction method of this embodiment does not necessarily include step 103 simultaneously. Therefore, in Figure 1 In the diagram, step 103 is indicated by a dashed box as an optional step that can be omitted during the actual SOC correction process. Furthermore, Figure 1 Other steps may also be included, but the present invention does not limit this.

[0144] Figure 2 This is a schematic diagram illustrating the steps of generating a correction reference table according to an embodiment of the present invention. Figure 2 As shown, the generation of the correction benchmark table in step 103 includes:

[0145] Step 1031: Generate a curve showing the relationship between the ratio of charge change to voltage change and SOC;

[0146] Step 1032: Determine the correction point based at least on the peaks and / or troughs on the relationship curve;

[0147] Step 1033: Determine the correction area based on the location of the correction point;

[0148] Step 1034: Generate a correction reference table based on the range of the correction area and the SOC values ​​of the correction points within the correction area.

[0149] The correction area is determined by the correction point, and the corrected SOC value is determined based on the correction area. When the correction points are close in location, or when the correction point corresponding to the same ratio of energy change and voltage change is not unique on the curve of SOC, the correction error or correction error can be effectively avoided.

[0150] In some embodiments, in step 1031, batteries with different capacity uniformities that are discharged (SOC = 0%) are charged under different temperatures and different SOH conditions according to the charging simulated power point (charging MAP). When the battery voltage change exceeds a preset value (e.g., 1mV), the change in charge ΔQ, the change in voltage ΔV, and the SOC corresponding to the change in charge ΔQ and the change in voltage ΔV are recorded in real time, i.e., the SOC after the voltage change; and based on the multiple sets of voltage change ΔV, the change in charge ΔQ before and after the voltage change, and the SOC after the voltage change recorded in real time during the charging process, a ΔQ / ΔV-SOC relationship curve is generated. Figure 3 This is a schematic diagram of the ΔQ / ΔV-SOC relationship curve according to an embodiment of the present invention. Figure 3 In the diagram, the horizontal axis represents SOC, and the vertical axis represents ΔQ / ΔV.

[0151] In some embodiments, a correction point is represented by a point on the relationship curve.

[0152] Accordingly, in some embodiments, in step 1032, a correction point is determined based on the peaks and / or troughs on the relationship curve.

[0153] For example, Figure 4 It is based on Figure 3 A schematic diagram of the correction points determined by the peaks and / or troughs on the relationship curve, such as... Figure 3 and Figure 4 As shown, the ΔQ / ΔV-SOC relationship curve includes multiple peaks and troughs, and correspondingly, multiple correction points are determined.

[0154] Correction points are determined by selecting peaks and / or troughs on the ΔQ / ΔV-SOC relationship curve. Peaks and troughs represent different stages of the cell's chemical reaction: peaks indicate a larger ΔQ / ΔV value, indicating a flat period of closed-circuit voltage (CCV); troughs indicate a smaller ΔQ / ΔV value, indicating a less flat period of CCV. Selecting peaks and / or troughs as correction points provides more obvious characteristics, making corrections less prone to error identification and more accurate. If only peaks or troughs are selected, the number of correction points decreases, and the cumulative error between correction points increases. Therefore, in this embodiment, both peaks and troughs are selected as correction points. Of course, in other embodiments, at least one of peaks and troughs can be selected as correction points.

[0155] In some embodiments, each correction point corresponds to a SOC value. For example Figure 4 As shown, the SOC value corresponding to each correction point is the x-coordinate of the correction point. A correction region is determined based on the location of the correction point, and the aforementioned correction reference table is generated based on the correction region and the corresponding SOC value to correct the current SOC in real time during the charging process.

[0156] When testing the battery, the battery's charge change, voltage change, and SOC after the voltage change are collected under different charging conditions when the voltage change is greater than or equal to a preset value. Based on the collected charge change, voltage change, and SOC after the voltage change, a curve showing the relationship between the ratio of charge change and voltage change and SOC is generated. The charging conditions include at least one of temperature, battery health status, and battery capacity consistency. In this way, the influence of charging conditions such as temperature, battery health status, and battery capacity consistency is considered when generating the correction benchmark table, which can effectively reduce the error of the corrected SOC.

[0157] In some embodiments, a correction point is represented by a correction range, which is expressed using a range of the ratio of charge change to voltage change (ΔQ / ΔV) and a state of charge (SOC) range. Figure 3 and Figure 4 As shown, the X-axis represents the SOC range, and the Y-axis represents the ratio range (ΔQ / ΔV). In other embodiments, the X-axis may also represent the ratio range (ΔQ / ΔV), and the Y-axis may represent the SOC range. The correction range is defined by the range of the ratio (ΔQ / ΔV) of the change in charge and the change in voltage, and by a SOC range. For ease of understanding, in this invention, the "correction point" represented by "correction range" can also be expressed as or referred to as "correction range".

[0158] The correction range is obtained by expanding the corresponding correction points based on the deviations in capacity or voltage, temperature differences, and degradation differences of each battery cell.

[0159] Therefore, by expanding the correction point to a correction range, the influence of factors such as battery capacity, voltage deviation, temperature difference, and degradation difference on the position of the correction point on the relationship curve between the ratio of charge change and voltage change and SOC can be reduced or even avoided, thereby reducing or even avoiding the increase in correction error or correction mistakes caused by the deviation of the correction point position.

[0160] Accordingly, in some embodiments, in step 1032, the correction point is determined not only based on the peaks and / or troughs on the relationship curve, but also based on the influence of factors such as the capacity or voltage deviation of the battery cell, temperature difference, and degradation difference.

[0161] For example, at least one reference point is determined based on the peaks and / or troughs on the relationship curve. The reference point is a point on the relationship curve. Then, based on the influence of factors such as the cell capacity or voltage deviation, temperature difference, and degradation difference of the battery, a corresponding correction range is formed on the basis of each reference point.

[0162] Figures 5A-5D This is a schematic diagram illustrating the correction range of an embodiment of the present invention.Figure 5A The diagram illustrates the interference between the two correction ranges on the axis representing ΔQ / ΔV. Figure 5B The diagram illustrates the interference between the two correction ranges on the axis representing the SOC. Figure 5C The diagram shows the case where the two correction ranges do not interfere with each other on the axis representing ΔQ / ΔV and the axis representing SOC. Figure 5D The diagram shows the case where the two correction ranges interfere on both the axis representing ΔQ / ΔV and the axis representing SOC.

[0163] like Figures 5A-5C As shown, assuming according to Figure 3 The ΔQ / ΔV-SOC relationship curve shown identifies at least one reference point, which is a point on the ΔQ / ΔV-SOC relationship curve, for example... Figures 5A-5C The reference points p1 and p2 are shown in the diagram. Taking reference point p1 as an example, based on reference point p1, considering the influence of cell capacity or voltage deviation, the coordinate range p11 is determined; considering the influence of temperature difference, the coordinate range p12 is determined; and considering the influence of degradation difference, the coordinate range p13 is determined. Then, based on the coordinates of coordinate ranges p11, p12, and p13, the correction range s1 is determined. For example, the upper limit of the ΔQ / ΔV range of this correction range is the maximum value of ΔQ / ΔV corresponding to coordinate ranges p11, p12, and p13. Figures 5A-5C The maximum value of the ordinate of coordinate ranges p11, p12, and p13; the lower limit of the range of ΔQ / ΔV for this correction range is the minimum value of ΔQ / ΔV corresponding to coordinate ranges p11, p12, and p13. Figures 5A-5C The minimum value of the ordinate of coordinate ranges p11, p12, and p13; the upper limit of the SOC range of this correction range is the maximum value of the SOC corresponding to coordinate ranges p11, p12, and p13. Figures 5A-5C The maximum value of the abscissa of coordinate ranges p11, p12, and p13; the lower limit of the SOC range of this correction range is the minimum value of the SOC corresponding to coordinate ranges p11, p12, and p13. Figures 5A-5C The minimum x-coordinate of coordinate ranges p11, p12, and p13 is used. The method for determining the corresponding correction range s2 based on reference point p2 is similar and will not be repeated here. The correction range can be, for example, a region of length H and width L. Different correction ranges may have the same or different values ​​for H and L.

[0164] In some embodiments, the coordinate ranges p11, p12, and p13 determined based on reference point p1 may contain only a single point or may be a range. The coordinate ranges p11, p12, and p13 may overlap with reference point p1, or with reference point p2, or the coordinate range determined based on reference point p2, or at least one of other reference points. In this case, the correction ranges s1 and s2 also overlap, for example... Figure 5D The overlapping range s3 is shown. Furthermore, the coordinate range determined based on the reference point may or may not include points on the relationship curve. Moreover, the number of coordinate ranges determined based on a reference point is not limited to three, and this application does not impose any limitation on this.

[0165] The following describes the steps for determining the correction area.

[0166] Figure 6 This is a schematic diagram of one step in determining the correction region according to an embodiment of the present invention, as shown below. Figure 6 As shown, when a correction point is represented by a point on the relationship curve, there exists a first adjacent correction point on the axis representing SOC, and a second adjacent correction point on the axis representing the ratio of charge change to voltage change; correspondingly, step 1033, determining the correction region based on the location of the correction point, includes:

[0167] Step 1033-1: Determine the SOC range corresponding to the correction region based on the correction point and the first adjacent correction point; and

[0168] Step 1033-2: Determine the range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction area based on the correction point and the second adjacent correction point.

[0169] When multiple correction points are available, for example, in the ΔQ / ΔV-SOC coordinate system, there may be multiple correction points in close proximity to the "current SOC" and the position represented by the corresponding "ΔQ / ΔV". Alternatively, if two or more correction points with the same ΔQ / ΔV but different SOCs and close proximity are determined based on the "ΔQ / ΔV" corresponding to the current SOC, improper selection of correction points may further increase the error between the corrected SOC and the actual SOC, or lead to incorrect correction. Therefore, through the above steps, non-overlapping correction regions can be determined for each correction point, avoiding the inability to determine the correction value of the current SOC due to the proximity or non-uniqueness of correction points, thus effectively preventing increased correction errors or incorrect correction.

[0170] In some embodiments, step 1033-1, determining the SOC range corresponding to the correction area according to the correction point and the first adjacent correction point includes:

[0171] Determining the first boundary SOC corresponding to the correction area according to the first SOC of the correction point, the second SOC of the first adjacent correction point, and the average value of the first SOC and the second SOC;

[0172] Determining the SOC range corresponding to the correction area according to the first SOC and the first boundary SOC.

[0173] In some embodiments, if on the axis representing SOC, there are adjacent adjacent correction points on both sides of the correction point, that is, there is an adjacent correction point whose SOC value is less than the SOC value of this correction point, and at the same time there is another adjacent correction point whose SOC value is greater than the SOC value of this correction point, then the adjacent correction point with a smaller difference between its SOC value and the SOC value of this correction point is determined as the first adjacent correction point. If the differences between the SOC values of the two adjacent correction points and the SOC value of this correction point are the same, either one is arbitrarily selected as the first adjacent correction point.

[0174] Figures 7A-7B is a schematic diagram of the implementation manner of the correction area of the embodiment of the present invention, as Figure 7A shown, on the axis representing SOC ( Figure 7A the horizontal axis of), there is a correction point q1 and a first adjacent correction point q2 adjacent to the correction point q1, and the first adjacent correction point q2 is located on the right side of the correction point q1. Among them, the SOC value of the correction point q1 is X1 (the first SOC), the SOC value of the first adjacent correction point q2 is X2 (the second SOC), and X1 < X2. The average value of the SOC value X1 of the correction point q1 and the SOC value X2 of the first adjacent correction point q2 is (X1 + X2) / 2.

[0175] The first boundary SOC corresponding to the correction area including the correction point q1 is expressed as X1 + a1, where (X1 + a1) < (X1 + X2) / 2. And the SOC range corresponding to the correction area determined according to the position of the correction point q1 is expressed as [X1 - a1, X1 + a1], and the length of this SOC range is 2*a1. Figure 7A shows a possible value of X1 + a1 and X1 - a1.

[0176] In some embodiments, the method further includes: determining the SOC range corresponding to the correction area including the first adjacent correction point according to the first SOC of the correction point, the second SOC of the first adjacent correction point, the average value of the first SOC and the second SOC, and the first boundary SOC.

[0177] For example, as Figure 7AAs shown, when the first boundary SOC of the correction point q1 is X1 + a1, the SOC range corresponding to the correction region including the first adjacent correction point q2 can be expressed as [X2 - b1, X2 + b1]. The length of this SOC range is 2 * b1, where (X2 - b1) > (X1 + X2) / 2, and (a1 + b1) < |X1 - X2|. Figure 7A A possible value of X2 + b1 and X2 - b1 is shown in Figure 7A .

[0178] Thereby, the complexity of determining the correction region including the correction point and the data processing workload can be reduced.

[0179] In addition, Figure 7A In Figure 7A , the first adjacent correction point q2 is located on the right side of the correction point q1. In other embodiments, the first adjacent correction point may also be located on the left side of the correction point q1, that is, the first adjacent correction point q2', whose SOC value is X2', and X2' < X1. At this time, the method for determining the SOC range of the correction region of the correction point is similar to the above steps, except that the first boundary SOC is expressed as X1 - a1', and (X1 - a1') > (X1 + X2') / 2, and the SOC range corresponding to the correction region including the first adjacent correction point q2' can be expressed as [X2' - b1', X2' + b1'], where (X2' + b1') < (X1 + X2') / 2, and a1' + b1' = |X1 - X2'|. The specific process will not be repeated here.

[0180] For the sake of simplicity of description, Figure 7A in Figure 7A , the value of ΔQ / ΔV of the correction point q1 and the value Y of ΔQ / ΔV of the first adjacent correction point q2 are assumed to be the same. In practical applications, the two can also be different, and this application does not limit this.

[0181] In some embodiments, step 1033 - 2, determining the range of the ratio of the power change to the voltage change corresponding to the correction region according to the correction point and the second adjacent correction point includes:

[0182] Determining the first boundary ratio corresponding to the correction region according to the first ratio of the power change to the voltage change of the correction point, the second ratio of the power change to the voltage change of the second adjacent correction point, and the average value of the first ratio and the second ratio;

[0183] Determining the range of the ratio of the power change to the voltage change (ΔQ / ΔV) corresponding to the correction region according to the first ratio and the first boundary ratio.

[0184] In some embodiments, if there are adjacent correction points on both sides of the correction point on the axis representing ΔQ / ΔV, that is, there is an adjacent correction point whose ΔQ / ΔV value is less than the ΔQ / ΔV value of this correction point, and at the same time there is another adjacent correction point whose ΔQ / ΔV value is greater than the ΔQ / ΔV value of this correction point, then the adjacent correction point with a smaller difference between its ΔQ / ΔV value and the ΔQ / ΔV value of this correction point is determined as the second adjacent correction point. If the differences between the ΔQ / ΔV values of the two adjacent correction points and the ΔQ / ΔV value of this correction point are the same, either one of them is selected as the second adjacent correction point.

[0185] As Figure 7B shown, on the axis representing ΔQ / ΔV ( Figure 7B on the vertical axis), there is a correction point q1 and a second adjacent correction point q3 adjacent to the correction point q1, and the second adjacent correction point q3 is located above the correction point q1. Among them, the ΔQ / ΔV value of the correction point q1 is Y1 (the first ratio), the ΔQ / ΔV value of the second adjacent correction point q3 is Y2 (the second ratio), and Y1 < Y2. The average value of the ΔQ / ΔV value Y1 of the correction point q1 and the ΔQ / ΔV value Y2 of the second adjacent correction point q3 is (Y1 + Y2) / 2.

[0186] The first boundary ratio corresponding to the correction region containing the correction point q1 is expressed as (Y1 * c1), where (Y1 * c1) < (Y1 + Y2) / 2, and c1 = (Y1 + Y2) / (2 * Y1). And the range of ΔQ / ΔV corresponding to the correction region determined according to the position of the correction point q1 is expressed as [Y1 * (2 - c1), Y1 * c1], and the length of this range of ΔQ / ΔV is 2 * Y1 * (c1 - 1). Figure 7B A possible value of Y1 * (2 - c1) and Y1 * c1 is shown in

[0187] In some embodiments, the method further includes: determining the range of ΔQ / ΔV corresponding to the correction region containing the second adjacent correction point according to the first ratio of the correction point, the second ratio of the second adjacent correction point, and the average value of the first ratio and the second ratio.

[0188] For example, as Figure 7B shown, the range of ΔQ / ΔV corresponding to the correction region containing the second adjacent correction point q3 can be expressed as [Y2 * d1, Y2 * (2 - d1)], and the length of this range of ΔQ / ΔV is 2 * Y2 * (1 - d1), where (Y2 * d1) > (Y1 + Y2) / 2, and d1 = (Y1 + Y2) / (2 * Y2). Figure 7B A possible value of Y2 * (2 - d1) and Y2 * d1 is shown in

[0189] Figure 7B Among them, the second adjacent correction point q3 is located above the correction point q1. In other embodiments, the second adjacent correction point may also be located below the correction point q1, that is, the second adjacent correction point q3', whose ΔQ / ΔV value is Y2', and Y2' < Y1. At this time, the method for determining the range of ΔQ / ΔV of the correction area of the correction point is similar to the above steps, except that the first boundary ratio is expressed as (Y1 * c1'), where (Y1 * c1') > (Y1 + Y2') / 2, c1' = (Y1 + Y2') / (2 * Y1), and the range of ΔQ / ΔV corresponding to the correction area determined according to the position of the correction point q1 is expressed as [Y1 * c1', Y1 * (2 - c1')]. The range of ΔQ / ΔV corresponding to the correction area including the second adjacent correction point q3' can be expressed as [Y2' * (2 - d1'), Y2' * d1'], where (Y2' * d1') < (Y1 + Y2') / 2, d1' = (Y1 + Y2') / (2 * Y2'). The specific process will not be repeated here.

[0190] Among them, c1 and d1 are correction coefficients. Since the ΔQ / ΔV value is slightly different due to the influence of the sensor, during the process of correcting the SOC, it is necessary to multiply by the correction coefficient to improve the accuracy.

[0191] For the sake of simplicity of description, Figure 7B Among them, the SOC values of the correction point q1 and the second adjacent correction point q3 are assumed to be the same. In practical applications, they can also be different, and this application does not limit this.

[0192] Figure 8 is another step schematic diagram for determining the correction area in the embodiment of the present invention. As Figure 8 shown, when a correction area is represented by a correction range, there is a first adjacent correction range adjacent to the correction range on the axis representing the SOC, and there is a second adjacent correction range adjacent to the correction range on the axis representing the ratio of the change in electric quantity to the change in voltage; correspondingly, in step 1033, determining the correction area according to the position of the correction point (or it can also be expressed as the correction range) includes:

[0193] Step 1033-3, determining the SOC range corresponding to the correction area according to the correction range and the first adjacent correction range; and

[0194] Step 1033-4, determining the range of the ratio of the change in electric quantity to the change in voltage corresponding to the correction area according to the correction range and the second adjacent correction range.

[0195] When multiple selectable correction ranges exist, for example, in the ΔQ / ΔV-SOC coordinate system, there may be multiple correction ranges with similar positions near the location represented by the "current SOC" and the corresponding "ΔQ / ΔV," or when two or more correction ranges with the same ΔQ / ΔV range but different SOC ranges and similar positions are determined based on the "ΔQ / ΔV" corresponding to the current SOC, improper selection of the correction range may further increase the error between the corrected SOC and the actual SOC, or lead to incorrect correction. Therefore, through the above steps, non-overlapping correction regions can be determined for each correction range, avoiding the inability to determine the correction value of the current SOC due to similar correction range positions or multiple correction ranges, thus effectively preventing increased correction errors or incorrect correction.

[0196] In some embodiments, step 1033-3, determining the SOC range corresponding to the correction region based on the correction range and the first adjacent correction range, includes:

[0197] The second boundary SOC corresponding to the correction region is determined based on the third SOC of the correction range, the fourth SOC of the first adjacent correction range, and the average value of the third SOC and the fourth SOC.

[0198] The SOC range corresponding to the correction region is determined based on the third SOC and the second boundary SOC.

[0199] In some embodiments, if on the axis representing SOC, there exist adjacent adjacent correction ranges on both sides of the correction range (i.e., there exists an adjacent correction range whose upper limit of SOC value is less than the lower limit of the SOC value of the correction range, and the difference between the two is a first SOC difference), and simultaneously there exists another adjacent correction range whose lower limit of SOC value is greater than the upper limit of the SOC value of the correction range, and the difference between the two is a second SOC difference), then the adjacent correction range corresponding to the smaller of the first SOC difference and the second SOC difference is determined as the first adjacent correction range. If the first SOC difference and the second SOC difference are the same, then either of the adjacent correction ranges is arbitrarily selected as the first adjacent correction range.

[0200] Figures 9A-9B This is a schematic diagram of another embodiment of the modified region of the present invention, as shown in the figure. Figure 9A As shown, on the axis representing SOC ( Figure 9AOn the horizontal axis), there is a correction range s1 and a first adjacent correction range s2 adjacent to the correction range s1. The first adjacent correction range s2 is located on the right side of the correction range s1. Among them, the upper limit of the SOC value of the correction range s1 is X11 (the third SOC), the lower limit is X12, and the length of the SOC range of the correction range s1 is L1 = X11 - X12; the lower limit of the SOC value of the first adjacent correction range s2 is X21 (the fourth SOC), the upper limit is X22, and the length of the SOC range of the second adjacent correction range s3 is L2 = X22 - X21; among them, X12 < X11 < X21 < X22, and the average value of the upper limit X11 of the SOC value of the correction range s1 and the lower limit X21 of the SOC value of the first adjacent correction range s2 is (X11 + X21) / 2.

[0201] The second boundary SOC corresponding to the correction region including the correction range s1 is represented as X11 + a2, where (X1 + a2) < (X11 + X21) / 2. And the SOC range corresponding to the correction region determined according to the position of the correction range s1 is represented as [X12 - a2, X11 + a2], and the length of this SOC range is (L1 + 2*a). Figure 9A A possible value of X12 - a2 and X11 + a2 is shown in.

[0202] In some embodiments, the method further includes: determining the SOC range corresponding to the correction region including the first adjacent correction range according to the third SOC of the correction range, the fourth SOC of the first adjacent correction range, the average value of the third SOC and the fourth SOC, and the second boundary SOC.

[0203] For example, as Figure 9A shown, when the second boundary SOC of the correction range s1 is X11 + a2, the SOC range corresponding to the correction region including the first adjacent correction range s2 can be represented as [X21 - b2, X22 + b2], and the length of this SOC range is (L2 + 2*b2), where (X21 - b2) > (X11 + X21) / 2, and (a2 + b2) < |X11 - X21|. Figure 9A A possible value of X21 - b2 and X22 + b2 is shown in.

[0204] Thus, the complexity of determining the correction region including the correction range and the data processing workload can be reduced.

[0205] In addition, Figure 9AAmong them, the first adjacent correction range s2 is located on the right side of the correction range s1. In other embodiments, the first adjacent correction range may also be located on the left side of the correction range s1, that is, the first adjacent correction range s2', the upper limit of its SOC value is X22', the lower limit is X21', and the length of the SOC range of the first adjacent correction range s2' is L2' = X22' - X21'; where X21' < X22' < X12 < X11. At this time, the method for determining the SOC range of the correction area of the correction range is similar to the above steps, except that the second boundary SOC is expressed as X12 - a2', and (X12 - a2') > (X12 + X22') / 2, and the SOC range corresponding to the correction area including the first adjacent correction range s2' can be expressed as [X21' - b2', X22' + b2'], where (X22' + b2') < (X12 + X22') / 2, and a2' + b2' = |X12 - X22'|. The specific process will not be repeated here.

[0206] In addition, Figure 9A the range of ΔQ / ΔV of the correction range s1 in may be the same as or different from the range of ΔQ / ΔV of the first adjacent correction range s2, and this application does not limit this.

[0207] In some embodiments, step 1033-4, determining the range of the ratio of the power change to the voltage change corresponding to the correction area according to the correction range and the second adjacent correction range includes:

[0208] Determining the second boundary ratio of the power change to the voltage change corresponding to the correction area according to the third ratio of the power change to the voltage change of the correction range, the fourth ratio of the power change to the voltage change of the first adjacent correction range, and the average value of the third ratio and the fourth ratio;

[0209] Determining the range of the ratio of the power change to the voltage change corresponding to the correction area according to the third ratio and the second boundary ratio.

[0210] In some embodiments, if on the axis representing ΔQ / ΔV, there are adjacent adjacent correction ranges on both sides of the correction range, that is, there is an adjacent correction range, the upper limit of its ΔQ / ΔV value is less than the lower limit of the ΔQ / ΔV value of this correction range, and the difference between the two is the first ΔQ / ΔV difference, and at the same time there is another adjacent correction range, the lower limit of its ΔQ / ΔV value is greater than the upper limit of the ΔQ / ΔV value of this correction range, and the difference between the two is the second ΔQ / ΔV difference, then the adjacent correction range corresponding to the smaller one of the first ΔQ / ΔV difference and the second ΔQ / ΔV difference is determined as the second adjacent correction range. If the first ΔQ / ΔV difference and the second ΔQ / ΔV difference are the same, either of the adjacent correction ranges is selected as the second adjacent correction range.

[0211] As Figure 9B shown, on the axis representing ΔQ / ΔV ( Figure 9B on the vertical axis), there is a correction range s1 and a second adjacent correction range s3 adjacent to the correction range s1. The second adjacent correction range s3 is located above the correction range s1. Among them, the upper limit of the ΔQ / ΔV value of the correction range s1 is Y11 (the third ratio), the lower limit is Y12, and the length of the range of ΔQ / ΔV of the correction range s1 is H1 = Y11 - Y12; the lower limit of the ΔQ / ΔV value of the second adjacent correction range s3 is Y21 (the fourth ratio), the upper limit is Y22, and the length of the range of ΔQ / ΔV of the second adjacent correction range s3 is H2 = Y22 - Y21; where Y12 < Y11 < Y21 < Y22, and the average value of the upper limit Y11 of the ΔQ / ΔV value of the correction range s1 and the lower limit Y21 of the ΔQ / ΔV value of the second adjacent correction range s3 is (Y1 + Y2) / 2.

[0212] The second boundary ratio corresponding to the correction region including the correction range s1 is expressed as (Y11*c2), where (Y11*c2) < (Y11 + Y21) / 2, and c2 = (Y11 + Y21) / (2*Y11), and c2 is the correction coefficient of the sensor. And the range of ΔQ / ΔV corresponding to the correction region determined according to the position of the correction range s1 is expressed as [(Y11*c2 - (H1 + 2*Y11*(c2 - 1)), Y11*c2], and the length of this range of ΔQ / ΔV is H1 + 2*Y11*(c2 - 1). Figure 9B One possible value of (Y11*c2 - (H1 + 2*Y11*(c2 - 1)) and Y11*c2 is shown.

[0213] In some embodiments, the method further includes: determining the range of ΔQ / ΔV corresponding to the correction region including the second adjacent correction range according to the third ratio of the correction range, the fourth ratio of the second adjacent correction range, and the average value of the third ratio and the fourth ratio.

[0214] For example, as Figure 9B shown, the range of ΔQ / ΔV corresponding to the correction region including the second adjacent correction range s3 can be expressed as [Y21*d2, Y21*d2 + H2 + 2*Y21*(1 - d2)], and the length of this range of ΔQ / ΔV is H2 + 2*Y21*(1 - d2), where (Y21*d2) > (Y11 + Y21) / 2, d2 = (Y11 + Y21) / (2*Y21), and d2 is the correction coefficient of the sensor. Figure 9B One possible value of Y21*d2 + H2 + 2*Y21*(1 - d2) and Y21*d2 is shown.

[0215] Thereby, it is possible to reduce the complexity of determining a correction region including a correction range and the data processing workload.

[0216] Figure 9B In this case, the second adjacent correction range s3 is located above the correction range s1. In other embodiments, the second adjacent correction range may also be located below the correction range s1, that is, the second adjacent correction range s3', the upper limit of its ΔQ / ΔV value is Y22', the lower limit is Y21', and the length of the range of ΔQ / ΔV of the second adjacent correction range s3' is H2' = Y22' - Y21'; wherein, Y21' < Y22' < Y12 < Y11. At this time, the method for determining the range of ΔQ / ΔV of the correction region of the correction range is similar to the above steps, except that the second boundary ratio is expressed as (Y12 * c2'), where, (Y12 * c2') > (Y12 + Y22') / 2, c2' = (Y12 + Y22') / (2 * Y12), and the range of ΔQ / ΔV corresponding to the correction region determined according to the position of the correction range s1 is expressed as [Y12 * c2', Y12 * c2' + H1 + 2 * Y12 * (1 - c2')]. The range of ΔQ / ΔV corresponding to the correction region including the second adjacent correction range s3' can be expressed as [Y22' * d2' - (H2' + 2 * Y22' * (d2' - 1), Y22' * d2'], where, (Y22' * d2') < (Y12 + Y22') / 2, d2' = (Y12 + Y22') / (2 * Y22'). The specific process will not be repeated here.

[0217] In addition, Figure 9B the SOC ranges of the correction range s1 and the second adjacent correction range s3 in may be the same or different, and the present application does not limit this.

[0218] In some embodiments, in step 1034, a correction reference table is generated according to the range of the correction region and the SOC values of the correction points within the correction region.

[0219] For example, in the case where a correction point is represented by a point on a relationship curve, the SOC value of the correction point within the correction region is: the SOC value of the correction point on the relationship curve used to determine this correction region.

[0220] In the case where a correction point is represented by a correction range, the SOC value of the correction point within the correction region is: the SOC value of the correction range used to determine this correction region. As described above, the correction range is determined according to a reference point on the relationship curve and factors such as the cell capacity or voltage deviation, temperature difference, and deterioration difference of the battery. Therefore, the SOC value of the correction range is the SOC value of the reference point on the relationship curve used to determine this correction range.

[0221] In some embodiments, the method for correcting the state of charge (SOC) of a battery further includes:

[0222] If the current SOC and the ratio of the change in charge to the change in voltage (ΔQ / ΔV) corresponding to the current SOC are within the overlap of at least two correction ranges, the current SOC of the battery will not be corrected.

[0223] For example, such as Figure 5D As shown, correction ranges s1 and s2 overlap by a range s3. If the current SOC and its corresponding ΔQ / ΔV fall within this overlap range s3, the correction value for the SOC is not unique (each correction range corresponds to a different SOC correction value). Therefore, it's uncertain which correction range's SOC correction value will result in a smaller error. Thus, when the current SOC falls within the overlap of at least two correction ranges, no correction is applied to the current SOC, effectively preventing increased correction error or incorrect correction.

[0224] Through the above embodiments, the present invention performs real-time correction on the initially determined SOC, effectively reducing the cumulative error of SOC;

[0225] Furthermore, by correcting the current SOC based on the correction area in the pre-generated correction benchmark table, corrections can be made when necessary, preventing erroneous corrections and further improving the accuracy and reliability of the corrections.

[0226] Furthermore, the range of the correction area in the correction benchmark table is determined based on the position of the correction point on the curve relating the ratio of charge change to voltage change during battery testing to SOC. This ensures the accuracy of the SOC correction results. For example, since the curve relating the ratio of charge change to voltage change during battery testing to SOC can be tested under various conditions, it can reduce or even eliminate the influence of factors such as battery state of health (SOH), temperature, capacity consistency, and charging current type (DC or AC) on SOC correction under actual operating conditions, thereby improving correction accuracy. Compared to existing methods that use a single fixed SOC error value to correct SOC, this method offers greater flexibility and results in a smaller error in the corrected SOC.

[0227] In addition, the battery state of charge correction method of the present invention has no limitation on the initial SOC during battery charging and has a wide range of applications.

[0228] In addition, the reduction in SOC error also helps improve the accuracy of operations such as determining vehicle control strategies and estimating driving range, thereby improving the user experience.

[0229] The following example illustrates the use of the battery state of charge correction method of this application. This example is not intended to limit the scope of this application.

[0230] Step 1: Detect the battery voltage in real time and calculate the voltage change ΔV;

[0231] Step 2: Determine if the voltage change ΔV is greater than or equal to the preset value of 1mV; if yes, proceed to Step 3; if no, return to Step 1.

[0232] Step 3: Obtain the charge change ΔQ corresponding to the voltage change ΔV, and the SOC after the voltage change (current SOC). In this step, the current SOC is the SOC to be corrected. The current SOC can be obtained, for example, by any existing method.

[0233] Step 4: Determine whether there is a correction region in the correction reference table that corresponds to "the ratio of voltage change to charge change ΔQ / ΔV" and "current SOC"; if yes, proceed to step 5; otherwise, proceed to step 7.

[0234] Specifically, a corresponding correction region exists when the ratio of voltage change to energy change ΔQ / ΔV and the current State of Charge (SOC) fall into the same correction region. For example, assuming the ratio of voltage change to energy change ΔQ / ΔV is 100, the current SOC is 69%, and there exists a correction region A with an SOC range of 68%–70% and a ΔQ / ΔV range of 80–120, then a correction region A corresponding to ΔQ / ΔV = 100 and SOC = 69% is considered to exist.

[0235] Step 5: Use the SOC values ​​of the correction points within the correction area determined in Step 4 to correct the current SOC.

[0236] For example, if the SOC value of the correction point in the correction region A determined in step 4 is 69.5%, then the current SOC will be corrected from 69% to 69.5%.

[0237] Step 6: Display the corrected SOC value.

[0238] Step 7: Do not make any corrections, and display the current SOC.

[0239] Second aspect of the embodiments

[0240] A second aspect of the present invention provides a battery equalization method. Figure 10 This is a block diagram of the battery equalization method according to an embodiment of the present invention, such as... Figure 10 As shown, the battery equalization method 200 includes:

[0241] Step 201: Detect the voltage of each cell in the battery;

[0242] Step 202: Determine the SOC value of each cell using the SOC correction method of any of the batteries provided in the first aspect of the present invention.

[0243] Step 203: Determine the total capacity of each cell based on its SOC value;

[0244] Step 204: Determine the remaining capacity of each cell based on the total capacity and SOC value of each cell;

[0245] Step 205: When the battery starts up, discharge the cell with the highest remaining capacity among all cells.

[0246] In step 202 of the battery equalization method 200, the battery SOC correction method of the present invention is applied. For details, please refer to the description of the embodiment of the first aspect of the present invention. Repeated content will not be described in detail again.

[0247] Through the above embodiments, in the process of battery equalization, the present invention corrects the SOC of the battery according to the SOC correction method of the first aspect of the present invention, which can reduce the SOC error, thereby improving the reliability of battery equalization and improving the user experience.

[0248] Third aspect of the embodiments

[0249] A third aspect of the present invention provides a terminal device, the terminal device comprising:

[0250] Memory, which is used to store computer programs;

[0251] The processor, when executing a computer program, implements the method for correcting the SOC of any battery provided in the first aspect of the present invention, and / or implements the method for equalizing the battery provided in the second aspect of the present invention, when executing a computer program.

[0252] This terminal device corresponds to the battery state of charge (SOC) correction method described in the first aspect of the present invention. The functions of this terminal device can be referred to in the embodiments of the first aspect, and repeated content will not be specifically described again; and / or

[0253] This terminal device corresponds to the battery equalization method described in the second aspect of the present invention. The functions of this terminal device can be referred to in the embodiments of the first and second aspects; repeated content will not be specifically described again.

[0254] In some embodiments, the terminal device may include various types of terminal devices, such as, but not limited to, in-vehicle terminal devices, mobile terminal devices, charging or energy storage devices (e.g., power banks). In this example, the terminal device is an in-vehicle terminal device, preferably an in-vehicle infotainment system.

[0255] Figure 11 This is a block diagram of a terminal device according to an embodiment of the present invention. Figure 11 As shown, terminal device 300 may include processor 310 and memory 320; memory 320 is coupled to processor 310. It is worth noting that this figure is exemplary; other types of structures may be used to supplement or replace this structure to implement telecommunications functions or other functions.

[0256] In one implementation, the processor 310 can be configured as follows:

[0257] Obtain the battery's SOC;

[0258] When the battery voltage change is greater than or equal to a preset value, the current SOC of the battery is corrected based on the current SOC, the ratio of the change in charge to the change in voltage, and a pre-generated correction reference table.

[0259] The correction reference table includes the range of at least one correction region and the SOC value of the correction point within the correction region. The range of the correction region is determined based on the position of the correction point on the curve relating the ratio of battery charge change to voltage change during testing to SOC.

[0260] In this embodiment of the invention, the implementation of the functions of the processor 310 can refer to the description of the relevant steps in the embodiment of the first aspect of the invention, and will not be repeated here.

[0261] Through the above embodiments, the initially determined SOC is corrected in real time, which effectively reduces the cumulative error of SOC.

[0262] Furthermore, by correcting the current SOC based on the correction area in the pre-generated correction benchmark table, corrections can be made when necessary, preventing erroneous corrections and further improving the accuracy and reliability of the corrections.

[0263] Furthermore, the range of the correction area in the correction benchmark table is determined based on the position of the correction point on the curve relating the ratio of charge change to voltage change during battery testing to SOC. This ensures the accuracy of the SOC correction results. For example, since the curve relating the ratio of charge change to voltage change during battery testing to SOC can be tested under various conditions, it can reduce or even eliminate the influence of factors such as battery state of health (SOH), temperature, capacity consistency, and charging current type (DC or AC) on SOC correction under actual operating conditions, thereby improving correction accuracy. Compared to existing methods that use a single fixed SOC error value to correct SOC, this method offers greater flexibility and results in a smaller error in the corrected SOC.

[0264] In addition, the battery state of charge correction method of the present invention has no limitation on the initial SOC during battery charging and has a wide range of applications.

[0265] In addition, the reduction in SOC error also helps improve the accuracy of operations such as determining vehicle control strategies and estimating driving range, thereby improving the user experience.

[0266] In another embodiment, the processor 310 can be configured as follows:

[0267] Detect the voltage of each cell in the battery;

[0268] The SOC correction method for any of the batteries provided in the first aspect of the present invention is used to determine the SOC value of each cell.

[0269] The total capacity of each cell is determined based on its SOC value.

[0270] The remaining capacity of each cell is determined based on its total capacity and SOC value.

[0271] When the battery starts up, the cell with the highest remaining capacity is discharged.

[0272] In this embodiment of the invention, the implementation of the functions of the processor 310 can be referred to the description of the relevant steps in the embodiments of the first and second aspects of the invention, and will not be repeated here.

[0273] The processor 310, sometimes also referred to as a controller or operating control, may include a microprocessor or other processor device and / or logic device, which receives input and controls the operation of various components of the purification device 300.

[0274] The memory 320 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It can store various types of data, and also programs for executing related information. The processor 310 can execute the program stored in the memory 320 to perform information storage or processing, etc. The functions of other components are similar to those in existing systems and will not be described further here. The components of the purification device 300 can be implemented using dedicated hardware, firmware, software, or a combination thereof without departing from the scope of the invention.

[0275] In addition, such as Figure 11 As shown, the terminal device 300 may also include a communication module 330. It is worth noting that the terminal device 300 is not necessarily required to include this module. Figure 11 All components shown; in addition, the terminal device 300 may also include Figure 11 For components not shown, please refer to relevant technologies.

[0276] Furthermore, in the process of battery equalization, the present invention corrects the SOC of the battery according to the SOC correction method of the first aspect of the present invention, which can reduce the SOC error and thus improve the effect of battery equalization, thereby improving the user experience.

[0277] This invention also provides a computer-readable program, wherein when the program is executed, the program causes the computer to perform a battery state of charge (SOC) correction method according to an embodiment of the first aspect of the invention, and / or a battery equalization method according to an embodiment of the second aspect of the invention.

[0278] This invention also provides a computer-readable storage medium storing a computer program that causes a computer to execute a battery state of charge (SOC) correction method according to an embodiment of the first aspect of this invention, and / or a battery equalization method according to an embodiment of the second aspect of this invention.

[0279] This invention also provides a computer program product, wherein when executed by a processor, the computer program product causes the computer to perform a battery state of charge (SOC) correction method according to an embodiment of the first aspect of this invention, and / or a battery equalization method according to an embodiment of the second aspect of this invention.

[0280] The apparatus and methods described above in the embodiments of the present invention can be implemented in hardware or in combination with software. The present invention relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the aforementioned apparatus or constituent parts, or to implement the various methods or steps described above.

[0281] The embodiments of the present invention also relate to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

[0282] Fourth aspect of the embodiment

[0283] An embodiment of the fourth aspect of the present invention provides a vehicle that includes the terminal device provided in the embodiment of the third aspect of the present invention.

[0284] It should be noted that the limitations of each step involved in this invention are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, or they can be executed later, or they can even be executed simultaneously. As long as this solution can be implemented, they should be considered to fall within the protection scope of this invention.

[0285] The present invention has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on its spirit and principles, and these modifications and variations are also within the scope of the present invention.

Claims

1. A method for correcting the state of charge (SOC) of a battery, characterized in that, The method includes: Obtain the battery's SOC; When the voltage change of the battery is greater than or equal to a preset value, the current SOC of the battery is corrected according to the current SOC, the ratio of the change in charge corresponding to the voltage change to the voltage change, and a pre-generated correction reference table. The correction reference table includes the range of at least one correction region and the SOC value of the correction point within the correction region. The range of the correction region is determined based on the position of the correction point on the curve relating the ratio of battery charge change to voltage change during testing to SOC.

2. The method according to claim 1, characterized in that, Based on the current SOC, the ratio of the change in charge corresponding to the voltage change to the voltage change, and a pre-generated correction reference table, the current SOC of the battery is corrected, including: When the ratio and the current SOC fall within a correction zone of the correction reference table, the SOC value at the correction point within that correction zone is determined as the corrected value for the current SOC of the battery; and / or When the ratio and the current SOC are not within any correction range of the correction reference table, the current SOC of the battery is not corrected.

3. The method according to claim 1, characterized in that, Based on the current SOC, the ratio of the change in charge corresponding to the voltage change to the voltage change, and a pre-generated correction reference table, the current SOC of the battery is corrected, including: When the ratio and the current SOC fall within a correction region of the correction reference table and the current SOC is within a preset range, the SOC value at the correction point within the correction region is determined as the correction value for the current SOC of the battery; and / or When the ratio and the current SOC are not within any correction area of ​​the correction reference table or the current SOC is not within the preset range, the current SOC of the battery is not corrected.

4. The method according to any one of claims 1-3, characterized in that, The method further includes generating the modified benchmark table; The step of generating the modified benchmark table includes: Generate a curve showing the relationship between the ratio of change in charge to change in voltage and SOC; The correction point should be determined at least based on the peaks and / or troughs on the relationship curve; The correction area is determined based on the location of the correction point; A correction benchmark table is generated based on the range of the correction region and the SOC values ​​of the correction points within the correction region.

5. The method according to claim 4, characterized in that, The relationship curves between the ratio of charge change to voltage change and SOC include: During battery testing, under different charging conditions, the battery's charge change, voltage change, and SOC after the voltage change are collected when the voltage change is greater than or equal to the preset value. A curve showing the relationship between the ratio of charge change to voltage change and SOC is then generated. The charging conditions include at least one of temperature, battery health status, and battery capacity consistency.

6. The method according to claim 4, characterized in that, The correction point is represented by a correction range, which is represented by a range of the ratio of charge change to voltage change and a SOC range.

7. The method according to claim 6, characterized in that, The correction range is obtained by extending the correction point based on the deviation of capacity or voltage, temperature difference, and degradation difference of each battery cell of the battery.

8. The method according to claim 6, characterized in that, The method further includes: When the ratio and the current SOC are within the overlap range of at least two of the correction ranges, the current SOC of the battery is not corrected.

9. The method according to claim 4, characterized in that, There is a first adjacent correction point on the axis representing SOC, and a second adjacent correction point on the axis representing the ratio of charge change to voltage change. And the correction area is determined based on the location of the correction point, including: The SOC range corresponding to the correction region is determined based on the correction point and the first adjacent correction point. as well as The range of the ratio of charge change to voltage change corresponding to the correction region is determined based on the correction point and the second adjacent correction point.

10. The method according to claim 9, characterized in that, Determining the SOC range corresponding to the corrected region based on the corrected point and the first adjacent corrected point includes: The first boundary SOC corresponding to the correction region is determined based on the first SOC of the correction point, the second SOC of the first adjacent correction point, and the average value of the first SOC and the second SOC. The SOC range corresponding to the correction region is determined based on the first SOC and the first boundary SOC.

11. The method according to claim 9, characterized in that, The range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined based on the correction point and the second adjacent correction point, including: The first boundary ratio corresponding to the correction region is determined based on the first ratio of the change in charge and the change in voltage at the correction point, the second ratio of the change in charge and the change in voltage at the second adjacent correction point, and the average of the first ratio and the second ratio. The range of the ratio of the change in electrical charge to the change in voltage corresponding to the correction region is determined based on the first ratio and the first boundary ratio.

12. The method according to claim 6, characterized in that, There is a first adjacent correction range on the axis representing SOC, and a second adjacent correction range on the axis representing the ratio of charge change to voltage change. And the correction area is determined based on the location of the correction point, including: The SOC range corresponding to the correction region is determined based on the correction range and the first adjacent correction range; and The range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined based on the correction range and the second adjacent correction range.

13. The method according to claim 12, characterized in that, Determining the SOC range corresponding to the corrected region based on the corrected range and the first adjacent corrected range includes: The second boundary SOC corresponding to the correction region is determined based on the third SOC of the correction range, the fourth SOC of the first adjacent correction range, and the average value of the third SOC and the fourth SOC. The SOC range corresponding to the correction region is determined based on the third SOC and the second boundary SOC.

14. The method according to claim 12, characterized in that, Based on the correction range and the second adjacent correction range, the range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined, including: Based on the third ratio of the change in charge and the change in voltage within the correction range, the fourth ratio of the change in charge and the change in voltage within the first adjacent correction range, and the average of the third ratio and the fourth ratio, a second boundary ratio of the change in charge and the change in voltage corresponding to the correction region is determined. The range of the ratio of the change in electrical quantity to the change in voltage corresponding to the correction region is determined based on the third ratio and the second boundary ratio.

15. A battery equalization method, characterized in that, The method includes: Detect the voltage of each cell in the battery; The SOC value of each cell is determined using the SOC correction method of any one of claims 1-14. The total capacity of each cell is determined based on its SOC value. The remaining capacity of each cell is determined based on the total capacity of each cell and the SOC value. When the battery starts up, the cell with the highest remaining capacity is discharged.

16. A terminal device, characterized in that, The terminal device includes: Memory, which is used to store computer programs; A processor, when executing the computer program, implements the method for correcting the state of charge of a battery as described in any one of claims 1 to 14, or implements the battery equalization method as described in claim 15.

17. A vehicle, characterized in that, The vehicle includes the terminal device as described in claim 16.

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