Soc correction method and device for vehicle battery, readable storage medium and terminal

Abstract

A SOC correction method and device of a vehicle battery, a readable storage medium and a terminal, the SOC correction method of the vehicle battery comprises: when a set correction period is reached, adjusting a default SOC center value of the battery to a target SOC center value to implement SOC scanning to complete SOC correction. The above scheme can actively correct the vehicle battery.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more particularly to a method and apparatus for correcting the state of charge (SOC) of a vehicle battery, a readable storage medium, and a terminal. Background Technology

[0002] For vehicles powered by batteries, the battery plays a crucial role in the vehicle's driving range. To ensure battery performance, the battery's state of charge (SOC) is typically controlled within a certain range during use, allowing the battery to operate at its optimal state.

[0003] The State of Charge (SOC) of a battery refers to the proportion of its total dischargeable capacity to the capacity it can release. It is typically calculated using an OCV-SOC lookup table, which uses the Open Circuit Voltage (OCV) and the mapping relationship between OCV and SOC in the OCV-SOC table to obtain the SOC value. However, for lithium iron phosphate batteries, within the optimal SOC range, the battery voltage (OCV) characteristic is flat. At this point, changes in SOC value result in relatively small voltage changes, remaining within a roughly horizontal range. Figure 1 The diagram shown illustrates the mapping relationship between the battery's OCV and SOC. Figure 1 In this diagram, W represents the SOC range corresponding to the battery's optimal state, and A indicates the SOC range where the voltage is almost constant, meaning the voltage is roughly within a certain range. Within this roughly constant voltage range, it's difficult to determine the SOC value solely based on voltage. The current integration method is typically used to estimate the SOC value.

[0004] However, the SOC value estimated using the current integration method is prone to sudden changes in SOC during battery use, which can affect the normal operation of the battery.

[0005] Currently, for mainstream electric vehicles (EVs), when the battery's State of Charge (SOC) decreases, plug-in charging via an external power source can be used to reset and correct the SOC during charging. However, for hybrid vehicles such as fuel cell electric vehicles (FCEVs), which can operate without plug-in charging, they typically have a generator unit and a driving battery. The generator unit charges the driving battery. Since plug-in charging is not required, the opportunity for SOC reset or correction is lost. Without SOC reset and correction, sudden SOC changes are likely to occur, which will affect the normal use of the battery. Summary of the Invention

[0006] The technical problem solved by the embodiments of the present invention is how to achieve SOC correction of vehicle batteries.

[0007] To address the aforementioned technical problems, this invention provides a method for correcting the State of Charge (SOC) of a vehicle battery, comprising: adjusting the default SOC center value of the battery to the target SOC center value when a set correction cycle is reached, and performing an SOC scan to complete the SOC correction.

[0008] Optionally, the implementation of SOC scanning to complete SOC correction includes: when the deviation between the actual voltage value and the estimated voltage value reaches a set deviation, maintaining the SOC center value of the battery at the target SOC center value for a first duration.

[0009] Optionally, the SOC correction method for the vehicle battery further includes: when the deviation between the actual voltage value and the estimated voltage value does not reach a set deviation, maintaining the SOC center value of the battery at the target SOC center value for a second duration, wherein the second duration is less than the first duration.

[0010] Optionally, the SOC scan includes: performing a SOC scan according to a pre-configured SOC adjustment rule, wherein the SOC adjustment rule includes: decreasing and / or increasing the default SOC center value.

[0011] Optionally, the step of increasing the default SOC center value includes: increasing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further increasing the intermediate SOC center value to obtain the target SOC center value.

[0012] Optionally, the step of reducing the default SOC center value includes: reducing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further reducing the intermediate SOC center value to obtain the target SOC center value.

[0013] Optionally, the SOC correction method for the vehicle battery further includes: after the SOC scan is completed or after the battery SOC correction is completed, restoring the SOC center value of the battery to the default SOC center value.

[0014] Optionally, the SOC correction method for the vehicle battery further includes: outputting a SOC correction reminder when a set correction cycle is reached; and / or, outputting a SOC correction completion reminder after the battery SOC correction is completed.

[0015] Optionally, if the SOC correction fails to be completed when the vehicle has finished driving, the SOC scan will continue when the vehicle is detected to be restarted.

[0016] This invention also provides a SOC correction device for a vehicle battery, comprising: an adjustment unit for adjusting the default SOC center value of the battery to a target SOC center value when a set correction cycle is reached; and a correction unit for performing SOC scanning to complete the SOC correction.

[0017] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the steps of any of the above-described vehicle battery SOC correction methods.

[0018] This invention also provides a terminal, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the steps of any of the above-described vehicle battery SOC correction methods when running the computer program.

[0019] Compared with the prior art, the technical solution of the embodiments of the present invention has the following beneficial effects:

[0020] When the set correction cycle is reached, the default SOC center value of the battery is adjusted to the target SOC center value, and an SOC scan is performed to complete the SOC correction. This enables proactive SOC correction of the vehicle to periodically eliminate SOC estimation errors, ensure the accuracy of subsequent battery SOC estimation, and ensure the normal use of the vehicle battery. Attached Figure Description

[0021] Figure 1 This is a mapping diagram between the battery's OCV and SOC.

[0022] Figure 2 This is a flowchart of a method for correcting the state of charge (SOC) of a vehicle battery according to an embodiment of the present invention;

[0023] Figure 3 This is a flowchart of another vehicle battery SOC correction method in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a vehicle battery SOC correction device according to an embodiment of the present invention. Detailed Implementation

[0025] As mentioned above, currently, for mainstream electric vehicles (EVs), when the battery's State of Charge (SOC) decreases, plug-in charging via an external power source can be used to reset and correct the SOC during charging. However, for hybrid vehicles such as FCEVs, which are typically equipped with a generator unit and a driving battery, the generator unit charges the driving battery, controlling the battery's SOC within a certain range to ensure optimal battery performance. Since plug-in charging is not required, the opportunity for SOC reset or correction is lost, and errors in battery SOC estimation cannot be corrected, leading to sudden SOC fluctuations. These fluctuations will affect the normal operation of the battery.

[0026] To address the aforementioned issues, in this embodiment of the invention, when a set correction cycle is reached, the default SOC center value of the battery is adjusted to the target SOC center value, and an SOC scan is performed to complete the SOC correction. This enables proactive SOC correction of the vehicle, periodically eliminating SOC estimation errors and ensuring the accuracy of subsequent battery SOC estimations, thereby ensuring the normal use of the vehicle battery.

[0027] To make the above-mentioned objectives, features and beneficial effects of the embodiments of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] This invention provides a method for correcting the State of Charge (SOC) of a vehicle battery, applicable to the SOC correction of hybrid vehicle batteries. It is also applicable to hybrid vehicles that can operate without plug-in charging, including fuel cell electric vehicles (FCEVs), hybrid electric vehicles, and other hybrid vehicles that do not require plug-in charging. The SOC correction method provided by this invention can be used to correct the SOC of the vehicle battery when the vehicle is in a running state, such as when the vehicle is in motion.

[0029] Reference Figure 2 The present invention provides a flowchart of a method for correcting the state of charge (SOC) of a vehicle battery according to an embodiment of the present invention, which may specifically include the following steps:

[0030] Step S21: When the set correction cycle is reached, adjust the default SOC center value of the battery to the target SOC center value.

[0031] Step S22: Perform a SOC scan to complete the SOC correction.

[0032] In some embodiments, when a specified time has elapsed since the last SOC correction was completed, it is determined that the set correction period has been reached, and step S21 is executed. If the time elapsed since the last SOC correction was completed has not elapsed since the last time, the time continues to accumulate, and step S21 is not executed.

[0033] In some embodiments, the specified duration may refer to the cumulative usage time of the vehicle. During the period when the vehicle is in the starting state, the cumulative duration of the vehicle being in the starting state is used as the cumulative usage time of the vehicle. The specified duration can be preset. Furthermore, the specified duration can be set based on one or more factors such as battery characteristics and the battery's error accumulation rate.

[0034] In some embodiments, the determination of whether a set correction period has been reached can also be based on the vehicle's cumulative mileage. That is, when it is detected that the cumulative mileage of the vehicle since the last SOC correction has reached a preset mileage threshold, it is determined that the set correction period has been reached, and step S21 described above is executed. Vehicle driving data can be acquired each time the vehicle is started. Subsequently, while the vehicle is in the starting state, the vehicle's mileage is accumulated to obtain the cumulative mileage. In this embodiment of the invention, the cumulative mileage can refer to the vehicle's cumulative mileage from the time the last SOC correction was completed to the current time.

[0035] The default SOC center value can be preset. During vehicle operation, it is expected that the battery SOC value can be maintained at the default SOC center value, so as to ensure that the battery has good performance at the default SOC center value while providing sufficient power.

[0036] In a specific implementation, step S22 may include: when the deviation between the actual voltage value and the estimated voltage value reaches a set deviation, maintaining the SOC center value of the battery at the target SOC center value for a first duration.

[0037] In specific implementation, when the deviation between the actual voltage value and the estimated voltage value does not reach the set deviation, the duration for which the SOC center value of the battery is maintained at the target SOC center value is a second duration, which is less than the first duration.

[0038] Research has shown that after adjusting the battery's default SOC center value to the target SOC center value, the battery's actual SOC usually needs to change from near the default SOC center value to near the target SOC center value. This process typically involves charging or discharging the battery, resulting in a relatively large change in SOC. This helps to identify SOC estimation errors by detecting the deviation between the estimated voltage value and the actual voltage value. Therefore, based on the deviation between the estimated voltage value and the actual voltage value, it can be determined whether SOC correction is necessary.

[0039] Specifically, the battery's SOC center value is maintained at the target SOC center value for a first duration, and during the time the battery's SOC center value is maintained at the target SOC center value, combined with... Figure 1 This process is expected to cause the battery's actual SOC value to break through the voltage plateau region A and enter either voltage inflection point region B or C. Within voltage inflection point region B or C, the correlation between voltage and SOC value is more pronounced. At this point, the corresponding SOC value is obtained based on the detected actual voltage, and corrections are made based on the obtained SOC value, thereby achieving SOC correction.

[0040] The first duration can be set based on the difference between the target SOC center value and the default SOC center value, as well as the battery's charging or discharging power, so that the battery's SOC can reach the target SOC center value within the first duration and the SOC correction can be completed at least within the first duration.

[0041] In practice, adjusting the battery's default SOC center value to the target SOC center value is the process of performing a SOC scan. During the SOC scan, a pre-configured SOC adjustment rule is followed. This rule includes decreasing and / or increasing the default SOC center value. In other words, the battery's default SOC center value is adjusted to the target SOC center value according to the pre-configured SOC adjustment rule.

[0042] In some embodiments, the SOC adjustment rule includes: first decreasing the default SOC center value, then increasing it, wherein the increased SOC center value is greater than the default SOC center value. Specifically, the SOC adjustment rule involves decreasing the default SOC center value by a preset first SOC adjustment range, using the decreased SOC center value as the target SOC center value, and when a specified first condition is met, increasing the decreased SOC center value by a second SOC adjustment range, using the increased SOC center value as the target SOC center value.

[0043] Further, step S22 may include: reducing the default SOC center value by a predetermined first SOC adjustment range, using the reduced SOC center value as the target SOC center value, starting a timer, and if a second duration is reached without detecting a deviation between the actual voltage value and the estimated voltage value reaching a set deviation, then it is determined that the first condition is met, and the reduced SOC center value is increased by a second SOC adjustment range, using the increased SOC center value as the target SOC center value. If a deviation between the actual voltage value and the estimated voltage value reaches a set deviation, then from the moment the deviation between the actual voltage value and the estimated voltage value reaches the set deviation, the battery SOC center value is maintained at the target SOC center value for a first duration, and after the first duration, it is determined that the first condition is met, and the reduced SOC center value is increased by a second SOC adjustment range, using the increased SOC center value as the target SOC center value. The first condition includes: continuously reaching a second duration without detecting a deviation between the actual voltage value and the estimated voltage value reaching a set deviation; or, maintaining the battery SOC center value as the target SOC center value for a first duration from the moment when the deviation between the actual voltage value and the estimated voltage value reaches a set deviation.

[0044] After using the increased and adjusted SOC center value as the target SOC center value, if the deviation between the actual voltage value and the estimated voltage value reaches a set deviation, then from the moment the deviation between the actual voltage value and the estimated voltage value reaches the set deviation, the battery's SOC center value is maintained at the target SOC center value for a first duration. If, after using the increased and adjusted SOC center value as the target SOC center value, the deviation between the actual voltage value and the estimated voltage value does not reach the set deviation within a second duration, then the current SOC scan ends.

[0045] In practice, the first SOC adjustment range can be set based on the default SOC center value, ensuring that the reduced SOC center value is within a suitable range. To minimize the impact of SOC correction on vehicle performance, the reduced SOC center value is configured to be no less than a set second threshold. The second threshold is selected to ensure relatively good performance when the battery operates based on the adjusted SOC center value; therefore, the second threshold is greater than 0.

[0046] The second SOC adjustment range can be set based on the default SOC center value, ensuring that the increased SOC center value obtained after adjusting the reduced SOC using the second SOC adjustment range is within a suitable range. To minimize the impact of SOC correction on the battery's power reception performance, the increased SOC center value is configured not to exceed a set first threshold. This first threshold is selected to ensure that the battery can still perform appropriate power management when operating based on the increased SOC center value; therefore, the first threshold is less than 100%.

[0047] The second SOC adjustment range is greater than the first SOC adjustment range, so that the increased SOC center value obtained by using the second SOC adjustment range can be greater than the default SOC center value, thus achieving an increased SOC center value that is above the default SOC center value.

[0048] For example, the second SOC adjustment range is twice the first SOC adjustment range. This ensures that during SOC scanning, the absolute values ​​of the differences between the increased and decreased target SOC center values ​​and the default SOC center value are the same.

[0049] In other embodiments, the SOC adjustment rule includes: first increasing the default SOC center value, then decreasing it, such that the decreased SOC center value is less than the default SOC center value. Specifically, the SOC adjustment rule includes increasing the default SOC center value by a predetermined third SOC adjustment magnitude, using the increased SOC center value as the target SOC center value, and when a first condition is met, decreasing the increased SOC center value by a fourth SOC adjustment magnitude, using the decreased SOC center value as the target SOC center value.

[0050] Further, step S22 may include: increasing the default SOC center value by a predetermined third SOC adjustment range, using the increased SOC center value as the target SOC center value, starting a timer, and if a second duration is reached without detecting a deviation between the actual voltage value and the estimated voltage value reaching a set deviation, then it is determined that the first condition is met, and the increased SOC center value is decreased by a fourth SOC adjustment range, using the decreased SOC center value as the target SOC center value. If a deviation between the actual voltage value and the estimated voltage value reaches a set deviation, then from the moment the deviation between the actual voltage value and the estimated voltage value reaches the set deviation, the battery SOC center value is maintained as the target SOC center value for a first duration, and after the first duration, it is determined that the first condition is met, and the increased SOC center value is decreased by a fourth SOC adjustment range, using the decreased SOC center value as the target SOC center value. The first condition includes: continuously reaching a second duration without detecting a deviation between the actual voltage value and the estimated voltage value reaching a set deviation; or, from the moment when the deviation between the actual voltage value and the estimated voltage value is detected to reach a set deviation, maintaining the battery SOC center value as the target SOC center value for a first duration.

[0051] After using the reduced and adjusted SOC center value as the target SOC center value, if the deviation between the actual voltage value and the estimated voltage value reaches a set deviation, then from the moment the deviation between the actual voltage value and the estimated voltage value reaches the set deviation, the battery SOC center value is maintained at the target SOC center value for a first duration. If, after using the reduced and adjusted SOC center value as the target SOC center value, the deviation between the actual voltage value and the estimated voltage value does not reach the set deviation within a second duration, then the current SOC scan ends.

[0052] The third SOC adjustment range can be set based on the default SOC center value, ensuring that the increased SOC center value obtained after adjusting the default SOC center value according to the third SOC adjustment range is within a suitable range. To minimize the impact of SOC correction on the battery's power reception performance, the increased SOC center value is configured not to exceed a set first threshold. This first threshold is selected to ensure that the battery can still perform power management when operating based on the increased SOC center value; therefore, the first threshold is less than 100%.

[0053] The fourth SOC adjustment range can be set based on the default SOC center value, ensuring that after adjusting the SOC by decreasing it following the increase, the reduced SOC center value remains within a suitable range. To minimize the impact of SOC correction on vehicle performance, the reduced SOC center value is configured to be no less than a set second threshold. This second threshold is selected to ensure relatively good battery performance when operating based on the adjusted SOC center value; therefore, the second threshold is greater than 0.

[0054] The fourth SOC adjustment range is greater than the third SOC adjustment range, so that the reduced SOC center value obtained by using the fourth SOC adjustment range can be less than the default SOC center value, thus achieving a reduced SOC center value below the default SOC center value.

[0055] For example, the fourth SOC adjustment range is twice that of the third SOC adjustment range. This ensures that during SOC scanning, the absolute values ​​of the differences between the increased and decreased target SOC center values ​​and the default SOC center value are the same.

[0056] In some other embodiments, the SOC adjustment rule includes making a minor adjustment to the default SOC center value.

[0057] In some other embodiments, the SOC adjustment rule includes increasing the default SOC center value.

[0058] In some other embodiments, increasing the default SOC center value includes: increasing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further increasing the intermediate SOC center value to obtain the target SOC center value. In this case, after further increasing the intermediate SOC center value to obtain the target SOC center value in step S22, the battery SOC center value is maintained at the target SOC center for a first duration.

[0059] If, after increasing the default SOC center value to the intermediate SOC center value, the deviation between the estimated voltage value and the actual voltage value does not reach the set deviation within the second time period, after satisfying the first condition, the intermediate SOC center value is reduced. The reduced SOC center value is less than the default SOC center value, and the reduced SOC center value is taken as the target SOC center value. If the deviation between the estimated voltage value and the actual voltage value reaches the set deviation, the battery SOC center value is maintained at the target SOC center value for a period of time equal to the first time period. If the deviation between the estimated voltage value and the actual voltage value does not reach the set deviation within the second time period, the current SOC scan ends.

[0060] Furthermore, the intermediate SOC center value is reduced, wherein the reduction is at least twice the increase of the default SOC center value. This ensures that the absolute value of the difference between the SOC center value obtained after reducing the intermediate SOC center value and the default SOC center value is relatively greater than the absolute value of the difference between the intermediate SOC center value and the default SOC center value. This helps to increase the probability of deviation between the estimated voltage value and the actual voltage value reaching the set deviation after reducing the intermediate SOC center value, and makes it easier for the battery voltage to deviate from the target SOC center value while maintaining the battery SOC center value at the target SOC center value. Figure 1 The voltage ramp region in the middle is more conducive to completing the correction of SOC.

[0061] In some other embodiments, when adjusting the default SOC center value, the default SOC center value can be reduced to an intermediate SOC center value. If the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, the intermediate SOC center value is further reduced to obtain the target SOC center value. In this case, in step S22, after the intermediate SOC center value is further increased to obtain the target SOC center value, the battery SOC center value is maintained at the target SOC center for a first duration.

[0062] If, after reducing the default SOC center value to the intermediate SOC center value, the deviation between the estimated voltage value and the actual voltage value does not reach the set deviation within the second time period, after satisfying the first condition, the intermediate SOC center value is increased. The increased SOC center value is greater than the default SOC center value, and the increased SOC center value is taken as the target SOC center value. If the deviation between the estimated voltage value and the actual voltage value reaches the set deviation, the battery SOC center value is maintained at the target SOC center value for a period of time until the first time period. If the deviation between the estimated voltage value and the actual voltage value does not reach the set deviation within the second time period, the current SOC scan ends.

[0063] After adjusting the default SOC center value of the battery to the target SOC center value, the estimated voltage value and the actual voltage value of the battery are obtained.

[0064] In practice, vehicle status parameters can be obtained from the vehicle itself, including the actual battery voltage. The actual battery voltage can be measured using a voltage measuring device.

[0065] The estimated voltage of a battery can be determined by estimating the state of charge (SOC) value. In some embodiments, a mapping table between SOC and voltage is pre-set. The voltage corresponding to the estimated SOC value can be found using the mapping table, and the voltage corresponding to the estimated SOC value is used as the estimated voltage value.

[0066] The obtained voltage estimate is the voltage estimated at the time when the actual voltage value is obtained, or the voltage estimate when the deviation from the time when the actual voltage value is obtained meets the set time deviation.

[0067] In practical implementation, to improve the accuracy of SOC correction determination, after adjusting the battery's default SOC center value to the target SOC center value, the estimated voltage value and the actual voltage value can be obtained multiple times. The deviation between the estimated voltage value and the actual voltage value obtained each time is calculated. Based on the deviation between the estimated voltage value and the actual voltage value obtained multiple times, it is determined whether SOC correction is needed. In this way, the problem of inaccurate SOC correction determination caused by abnormalities in a single obtained estimated voltage value and actual voltage value can be solved.

[0068] Specifically, the number of times the deviation between the actual voltage value and the estimated voltage value reaches a set deviation is accumulated. If the number of times the deviation between the actual voltage value and the estimated voltage value reaches a set deviation threshold is reached, it is determined that the deviation between the actual voltage value and the estimated voltage value has reached a set deviation. From the moment the deviation reaches a certain number, the battery SOC center is maintained as the target SOC center value for a first duration.

[0069] If the deviation between the estimated voltage value and the actual voltage value does not exceed the set deviation, it is determined that no SOC correction is needed. Then, wait for the next SOC scan. After entering the next SOC scan, continue to acquire the estimated voltage value and the actual voltage value, and determine whether SOC correction is needed based on the deviation between the estimated voltage value and the actual voltage value.

[0070] As can be seen from the above, when the set correction cycle is reached, the default SOC center value of the battery is adjusted to the target SOC center value, and SOC scanning is performed to complete the SOC correction. This enables the vehicle to actively perform SOC correction, periodically eliminate SOC estimation errors, improve the accuracy of subsequent battery SOC estimation, and ensure the normal use of the vehicle battery.

[0071] Reference Figure 3 The present invention provides a flowchart of another method for correcting the state of charge (SOC) of a vehicle battery according to an embodiment of the present invention, which may specifically include the following steps:

[0072] Step S301: Determine whether the correction cycle has been reached.

[0073] If the judgment result is negative, proceed to step S302; if the judgment result is positive, proceed to step S303.

[0074] Step S302: Keep the default SOC center value. Continue to step S301.

[0075] Step S303: Adjust the battery's default SOC center value to the target SOC center value.

[0076] Step S304: Determine whether the deviation between the actual voltage value and the estimated voltage value reaches the set deviation and increase the default SOC center value.

[0077] If the judgment result is yes, proceed to step S305; if the judgment result is no, proceed to step S309.

[0078] Step S305: Maintain the battery's SOC center value at the target SOC center value.

[0079] Step S306: Time the duration of maintenance.

[0080] Step S307: Determine whether the duration of maintenance has reached the first duration.

[0081] If the judgment result is yes, proceed to step S308; if the judgment result is no, continue to proceed to step S306.

[0082] Step S308: Reset the duration timer to zero.

[0083] After step S308 is completed, continue with step S301.

[0084] Step S309: Determine whether the deviation between the actual voltage value and the estimated voltage value reaches the set deviation and adjust the default SOC center value by reducing it.

[0085] If the judgment result is yes, proceed to step S310; if the judgment result is no, proceed to step S314.

[0086] Step S310: Maintain the battery's SOC center value at the target SOC center value.

[0087] Step S311: Time the duration of maintenance.

[0088] Step S312: Determine whether the duration of maintenance has reached the first duration.

[0089] If the judgment result is yes, proceed to step S313; if the judgment result is no, continue to proceed to step S311.

[0090] Step S313: Reset the duration timer to zero.

[0091] After step S313 is completed, continue with step S301.

[0092] Step S314: Maintain the battery SOC center value at the target SOC center value for a second duration.

[0093] Then, proceed with step S301.

[0094] It should be noted that in the above example, the execution of step S304 after step S303 is described as an example. In another modified embodiment, step S309 can also be executed after step S303. Accordingly, if the judgment result of step S309 is negative, step S304 is executed. If the judgment result of step S304 is negative, step S314 is executed. The execution order of other steps is basically the same and will not be described again.

[0095] In practice, when the set correction cycle is reached, a SOC correction reminder is output; and / or, after the battery SOC correction is completed, a SOC correction completion reminder is output, so that users can intuitively know the battery's SOC correction status and improve the user experience.

[0096] SOC correction reminders can be displayed on the in-vehicle display settings (screen or text), indicated by flashing indicator lights on the vehicle's dashboard, or announced via voice. Similarly, SOC correction completion reminders can be displayed on the in-vehicle display settings, indicated by flashing indicator lights on the vehicle's dashboard, or announced via voice.

[0097] In practice, after the SOC scan is completed or after the battery SOC correction is completed, the SOC center value of the battery is restored to the default SOC center value, so that the battery can continue to work based on the default SOC center value after the battery SOC correction is completed, and maintain better battery performance.

[0098] In practice, after the battery SOC correction is completed, the vehicle's usage time is then monitored again in preparation for the next correction cycle.

[0099] In practice, there may be situations where the vehicle stops driving but fails to maintain the battery's SOC center value at the target SOC center value for the first duration, which may result in the failure to complete the battery SOC correction. In order to ensure the normal progress of battery SOC correction, when it is detected that the vehicle has stopped driving but the battery SOC correction has failed to be completed, the SOC scan will continue when the vehicle is detected to start again, that is, the above steps S21 to S22 will continue to be executed.

[0100] This invention also provides a SOC correction device for a vehicle battery, referring to... Figure 4 A schematic diagram of a vehicle battery SOC correction device according to an embodiment of the present invention is provided. The vehicle battery SOC correction device 40 may include:

[0101] The adjustment unit 41 is used to adjust the default SOC center value of the battery to the target SOC center value when the set correction cycle is reached.

[0102] The correction unit 42 is used to perform SOC scanning to complete SOC correction.

[0103] In specific implementation, the working principle and method of the vehicle battery SOC correction device 40 can be found in the description of the vehicle battery SOC correction method provided in the above embodiments, and will not be repeated here.

[0104] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the steps of the vehicle battery SOC correction method provided in any of the above embodiments.

[0105] This invention also provides a terminal, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes the steps of the vehicle battery SOC correction method provided in any of the above embodiments.

[0106] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in any computer-readable storage medium, which may include ROM, RAM, disk, or optical disk, etc.

[0107] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for correcting the state of charge (SOC) of a vehicle battery, characterized in that, include: When the set correction cycle is reached, the default SOC center value of the battery is adjusted to the target SOC center value, and an SOC scan is performed to complete the SOC correction. The implementation of SOC scanning includes: performing SOC scanning according to pre-configured SOC adjustment rules, wherein the SOC adjustment rules include: decreasing and / or increasing the default SOC center value; The adjustment of the default SOC center value includes: increasing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further increasing the intermediate SOC center value to obtain the target SOC center value; if, after increasing the default SOC center value to the intermediate SOC center value, the deviation between the estimated voltage value and the actual voltage value does not reach a set deviation within a second time period, after satisfying a first condition, decreasing the intermediate SOC center value, whereby the decreased SOC center value is less than the target SOC center value. The default SOC center value is used as the target SOC center value. If the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, the battery SOC center value is maintained at the target SOC center value for a first duration. If the deviation between the estimated voltage value and the actual voltage value does not reach the set deviation after the second duration, the current SOC scan ends. The magnitude of the reduction adjustment of the intermediate SOC center value is at least 1 times the magnitude of the increase when the default SOC center value is increased to the intermediate SOC center value. The step of reducing the default SOC center value includes: reducing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further reducing the intermediate SOC center value to obtain the target SOC center value; if, after reducing the default SOC center value to the intermediate SOC center value, the deviation between the estimated voltage value and the actual voltage value does not reach a set deviation within a second time period, after satisfying a first condition, increasing the intermediate SOC center value; the increased SOC center value is greater than the default SOC center value, and the increased SOC center value is used as the target SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, maintaining the battery SOC center value at the target SOC center value for a first time period; if, during the second time period, the deviation between the estimated voltage value and the actual voltage value does not reach a set deviation, then ending the current SOC scan.

2. The SOC correction method for a vehicle battery as described in claim 1, characterized in that, The implementation of SOC scanning to complete SOC correction includes: when the deviation between the actual voltage value and the estimated voltage value reaches a set deviation, maintaining the SOC center value of the battery at the target SOC center value for a first duration.

3. The SOC correction method for a vehicle battery as described in claim 2, characterized in that, Also includes: When the deviation between the actual voltage value and the estimated voltage value does not reach the set deviation, the duration for which the SOC center value of the battery is maintained at the target SOC center value is a second duration, which is less than the first duration.

4. The SOC correction method for a vehicle battery as described in claim 1, characterized in that, Also includes: After the SOC scan is completed or after the battery SOC correction is completed, the SOC center value of the battery is restored to the default SOC center value.

5. The SOC correction method for a vehicle battery as described in claim 1, characterized in that, Also includes: When the set correction cycle is reached, a SOC correction reminder will be output; And / or, after completing the battery SOC correction, output a SOC correction completion notification.

6. The SOC correction method for a vehicle battery as described in claim 1, characterized in that, If the vehicle's journey is detected to have ended but the SOC correction has not been successfully completed, the SOC scan will continue when the vehicle is detected to have started again.

7. A SOC correction device for a vehicle battery, characterized in that, include: The adjustment unit is used to adjust the battery's default SOC center value to the target SOC center value when the set correction cycle is reached. The correction unit is used to perform SOC scanning to complete SOC correction. The correction unit is used to perform SOC scanning according to a pre-configured SOC adjustment rule, which includes: reducing and / or increasing the default SOC center value; The adjustment of the default SOC center value includes: increasing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further increasing the intermediate SOC center value to obtain the target SOC center value; if, after increasing the default SOC center value to the intermediate SOC center value, the deviation between the estimated voltage value and the actual voltage value does not reach a set deviation within a second time period, after satisfying a first condition, decreasing the intermediate SOC center value, whereby the decreased SOC center value is less than the target SOC center value. The default SOC center value is used as the target SOC center value. If the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, the battery SOC center value is maintained at the target SOC center value for a first duration. If the deviation between the estimated voltage value and the actual voltage value does not reach the set deviation after the second duration, the current SOC scan ends. The magnitude of the reduction adjustment of the intermediate SOC center value is at least 1 times the magnitude of the increase when the default SOC center value is increased to the intermediate SOC center value. The step of reducing the default SOC center value includes: reducing the default SOC center value to an intermediate SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, further reducing the intermediate SOC center value to obtain the target SOC center value; if, after reducing the default SOC center value to the intermediate SOC center value, the deviation between the estimated voltage value and the actual voltage value does not reach a set deviation within a second time period, after satisfying a first condition, increasing the intermediate SOC center value; the increased SOC center value is greater than the default SOC center value, and the increased SOC center value is used as the target SOC center value; if the deviation between the estimated voltage value and the actual voltage value reaches a set deviation, maintaining the battery SOC center value at the target SOC center value for a first time period; if, during the second time period, the deviation between the estimated voltage value and the actual voltage value does not reach a set deviation, then ending the current SOC scan.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor, it performs the steps of the SOC correction method for the vehicle battery according to any one of claims 1 to 6.

9. A terminal comprising a memory and a processor, wherein the memory stores a computer program capable of running on the processor, characterized in that, When the processor runs the computer program, it performs the steps of the SOC correction method for a vehicle battery according to any one of claims 1 to 6.

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