Battery SOC correction method and device, storage medium, and terminal

Abstract

A battery SOC correction method and device, storage medium, and terminal are disclosed. The method comprises: monitoring the battery's cumulative operating hours; when charging the battery with an external power source, correcting the battery's SOC value if the monitored cumulative operating hours meet a correction condition. The correction condition includes a correction period determined based on the rate of increase of the battery's SOC cumulative error and the SOC error tolerance. This approach improves the rationality of determining the correct timing for the battery's SOC, ensuring proper battery operation.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of batteries, and in particular to a method and device for correcting the SOC of a battery, a storage medium, and a terminal. Background Art

[0002] For vehicles powered by batteries, the battery plays a key role in the vehicle's 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] A battery's SOC refers to the ratio of the battery's available capacity to its total available capacity. The SOC value is typically determined using an OCV-SOC lookup table, combining the open circuit voltage (OCV) with the mapping between OCV and SOC in the OCV-SOC table. However, for some battery types (such as lithium iron phosphate batteries), the voltage remains nearly constant within the SOC range corresponding to the battery's optimal state, making it difficult to determine the SOC value based on voltage alone. The current integration method is typically used to estimate the SOC value.

[0004] However, the SOC value estimated by the current integration method is prone to sudden SOC changes when the battery is in use, thereby affecting the normal use of the battery. Summary of the Invention

[0005] The purpose of the embodiment of the present invention is to provide a method for correcting the SOC of a battery.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a battery SOC correction method, comprising: monitoring the cumulative working hours of the battery; when the battery is charged by an external power supply, if it is monitored that the cumulative working hours of the battery meet the correction conditions, correcting the SOC value of the battery; wherein the correction conditions include a correction period, and the correction period is determined based on the rising speed of the SOC cumulative error of the battery and the allowable error deviation of the SOC.

[0007] Optionally, the allowable error deviation of the SOC includes a first deviation and / or a second deviation, wherein the first deviation is the maximum deviation allowed for the estimated SOC value to be greater than the actual SOC value, and the second deviation is the maximum deviation allowed for the estimated SOC value to be less than the actual SOC value.

[0008] Optionally, the correction period is determined in the following manner: based on the SOC cumulative error rising rate, it is estimated that a first time duration is required for the deviation of the SOC estimated value greater than the SOC true value to reach the first deviation; based on the SOC cumulative error rising rate, it is estimated that a second time duration is required for the deviation of the SOC estimated value less than the SOC true value to reach the second deviation; the correction period is determined based on the first time duration and / or the second time duration.

[0009] Optionally, if it is monitored that the cumulative operating time of the battery meets the correction condition, the SOC value of the battery is corrected, including: when it is monitored that the cumulative operating time of the battery reaches the correction period, raising the fully charged SOC value of the battery from a first threshold to a second threshold; when a gun plug signal is detected, generating an SOC correction request; detecting the charging voltage of the battery; when it is detected that the charging voltage of the battery reaches a first voltage threshold, in response to the SOC correction request, correcting the SOC value corresponding to the first voltage threshold to the second threshold.

[0010] Optionally, the battery SOC correction method further includes: after correcting the SOC value corresponding to the first voltage threshold to the second threshold, reducing the full charge SOC value from the second threshold to the first threshold.

[0011] Optionally, the SOC correction method of the battery further includes: after the SOC value corresponding to the first voltage threshold is corrected to the second threshold, the SOC correction request is terminated and a discharge request is generated; in response to the discharge request, a designated component is called to discharge the battery until the SOC value of the battery is reduced to a third threshold; after the SOC value of the battery is reduced to the third threshold, the accumulated working time of the battery is cleared, and the accumulated working time of the battery is re-monitored.

[0012] Optionally, the first deviation is determined in the following manner: based on a preset SOC lower limit value and an actual SOC lower limit value, a difference between the preset SOC lower limit value and the actual SOC lower limit value is calculated, and the first deviation is determined based on the difference; the second deviation is determined in the following manner: based on the actual SOC value, the deceleration specified by the law, and the preset SOC upper limit value, the second deviation is determined.

[0013] An embodiment of the present invention also provides a battery SOC correction device, comprising: an operating time monitoring unit, for monitoring the cumulative operating time of the battery; a correction unit, for correcting the SOC value of the battery when the battery is charged by an external power supply, if it is monitored that the cumulative operating time of the battery meets a correction condition, wherein the correction condition includes a correction period, and the correction period is determined based on the rising speed of the SOC cumulative error of the battery and the allowable error deviation of the SOC.

[0014] An embodiment of the present invention further provides a storage medium, which is a non-volatile storage medium or a non-transient storage medium, storing a computer program thereon, and when the computer program is run by a processor, the steps of any of the above-mentioned battery SOC correction methods are executed.

[0015] An embodiment of the present invention further provides a terminal including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and the processor executes the steps of any of the above-mentioned battery SOC correction methods when running the computer program.

[0016] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0017] When the battery is charged with an external power supply, if it is monitored that the cumulative working time of the battery meets the correction conditions, the SOC value of the battery is corrected, wherein the correction conditions include a correction period, and the correction period is determined based on the rising speed of the battery's SOC cumulative error and the allowable error deviation of the SOC. Therefore, the timing of the battery's SOC value correction is related to the rising speed of the SOC cumulative error and the allowable error deviation of the SOC, thereby improving the rationality of determining the correction timing of the battery's SOC and ensuring the normal use of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flow chart of a battery SOC correction method according to an embodiment of the present invention;

[0019] Figure 2 is a timing diagram of a battery SOC correction method in an embodiment of the present invention;

[0020] Figure 3 1 is a schematic structural diagram of a battery SOC correction device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] As mentioned above, for some types of batteries (such as lithium iron phosphate batteries), the voltage is almost the same within the SOC range corresponding to the optimal state of the battery, making it difficult to determine the SOC value through voltage. In the prior art, the current integration method is usually used to estimate the SOC value. The current integration method for SOC value estimation usually uses a current sensor to sample the current value. Since the current sensor has a certain error, and the error accumulates over time. During the use of the battery, when the accumulated error reaches a certain level, it is easy to cause a sudden change in the SOC, which in turn affects the normal use of the battery.

[0022] In order to solve the above-mentioned purpose, in an embodiment of the present invention, when the battery is charged by an external power supply, if it is monitored that the cumulative working time of the battery meets the correction condition, the SOC value of the battery is corrected, wherein the correction condition includes a correction period, and the correction period is determined based on the rising speed of the battery's SOC cumulative error and the allowable error deviation of the SOC. Therefore, the timing of correcting the battery's SOC value is related to the rising speed of the SOC cumulative error and the allowable error deviation of the SOC. Therefore, the rationality of determining the correction timing of the battery's SOC can be improved to ensure the normal use of the battery.

[0023] In order to make the above-mentioned objects, features and beneficial effects of the embodiments of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] The embodiment of the present invention provides a method for correcting the SOC of a battery, referring to Figure 1 , a flow chart of a battery SOC correction method according to an embodiment of the present invention is provided, which may specifically include the following steps:

[0025] Step S11, monitoring the cumulative working time of the battery.

[0026] In vehicles such as electric vehicles or hybrid electric vehicles that use batteries as power sources, the accumulated operating hours of the batteries can be monitored by monitoring the start or shutdown of the vehicle.

[0027] Step S12: When the battery is charged by an external power source, if it is monitored that the accumulated working time of the battery meets a correction condition, the SOC value of the battery is corrected.

[0028] In a specific implementation, the correction condition may include a correction period, which may be determined based on a rate of increase in the battery's SOC cumulative error and an allowable deviation of the SOC error.

[0029] In the embodiments of the present invention, charging the battery using an external power source is also referred to as AC / DC charging. Charging the battery using an external power source typically involves plugging the battery into a charging station. When charging the battery using an external power source, the battery's SOC value can be calibrated.

[0030] Research has found that sudden changes in battery SOC during use are caused by errors in the current sensor used to collect current values during the current sampling process. Furthermore, errors may also occur during the analog-to-digital (A / D) conversion of the current values collected by the current sensor. Consequently, there is a deviation between the estimated SOC value calculated based on the integration of the current value and time and the actual SOC value. Because the estimated SOC value is calculated based on time integration, errors accumulate over time, and the deviation between the estimated SOC value and the actual SOC value gradually increases as the battery's usage increases. As the SOC value deviation increases, sudden changes in SOC are more likely to occur during battery use.

[0031] In a specific implementation, the allowable deviation of the SOC error may include a first deviation and / or a second deviation. The first deviation is the maximum deviation allowed for the estimated SOC value to be greater than the actual SOC value. The second deviation is the maximum deviation allowed for the estimated SOC value to be less than the actual SOC value.

[0032] That is, when the allowable SOC error deviation includes the first deviation, the correction period is determined based on the accumulated SOC error increase rate and the first deviation. When the allowable SOC error deviation includes the second deviation, the correction period is determined based on the accumulated SOC error increase rate and the second deviation. When the allowable SOC error deviation includes the first deviation and the second deviation, the correction period is determined based on the accumulated SOC error increase rate, the first deviation, and the second deviation.

[0033] In practice, a preset lower SOC limit (also known as full-discharge SOC) is typically configured to maintain the battery in optimal operating condition. When the estimated SOC reaches the lower limit, battery discharge is restricted, and charging is typically required to prevent battery depletion and improve battery performance.

[0034] In a specific implementation, the first deviation can be determined in the following manner: based on the preset SOC lower limit value and the actual SOC lower limit value, the difference between the preset SOC lower limit value and the actual SOC lower limit value is calculated, and the maximum deviation of the allowed SOC estimated value greater than the actual SOC value is obtained based on the calculated difference, that is, the first deviation is obtained.

[0035] In some non-limiting embodiments, a commonly used SOC lower limit value may be set from the perspective of energy management and used as the preset SOC lower limit value. Energy management may include one or more of vehicle energy management and battery energy management.

[0036] In some non-limiting embodiments, the actual SOC lower limit value may be calculated based on the battery output required to meet the vehicle output power demand.

[0037] In practice, to ensure that the battery maintains optimal operating conditions, a preset upper SOC limit (also referred to as a fully charged SOC) is typically configured for the battery. When the estimated SOC reaches the preset upper SOC limit during battery charging, the battery is deemed fully charged and charging is stopped.

[0038] When the preset SOC lower limit value and the preset SOC upper limit value of the battery are configured at the same time, the corresponding SOC value when the battery is working is usually between the preset SOC lower limit value and the preset SOC upper limit value, so that the battery is in the best working state.

[0039] In a specific implementation, the second deviation may be determined according to the actual SOC value, the deceleration specified by laws and regulations, and a preset SOC upper limit value.

[0040] In order to meet the deceleration requirements of the regulations, in some embodiments, battery energy is regenerated to generate a corresponding deceleration by regenerating energy to meet the deceleration requirements of the regulations.

[0041] In this embodiment of the present invention, the SOC value required for energy regeneration is set to facilitate determination of the second deviation. This ensures that, even when the battery is at a preset full charge, it can still be charged during vehicle deceleration to achieve brake energy recovery. This means that even at the preset full charge, the battery still has the ability to recover brake energy during deceleration, meeting regulatory deceleration requirements. This configured second deviation prevents the SOC from reaching the upper limit of the regulatory brake energy recovery process, preventing proper recovery of braking energy.

[0042] In some embodiments, the second deviation can be calculated using the following formula (1). That is, the second deviation, the actual SOC value, the estimated SOC value, the SOC value required for energy regeneration, and the preset SOC upper limit value satisfy the conditions defined by the following formulas (1) and (2).

[0043] ΔSOC<SOC r -SOC e ; (1)

[0044] SOCe =SOC f +SOC n ; (2)

[0045] Among them, ΔSOC is the second deviation; SOC f is the preset SOC upper limit value; SOC n The SOC value required for energy recovery; SOC r is the true value of SOC; SOC e is an estimated value.

[0046] In specific implementations, the specific values of the first deviation or the second deviation can be configured based on the vehicle's usage scenario. Different usage scenarios may have different driving routes, road conditions, and other factors, resulting in different configured first and second deviations. In other words, the specific values of the first and second deviations can be configured based on the vehicle's actual usage scenario. Road conditions may include road slope, slope length, and other factors.

[0047] As the battery is used for a longer time, the deviation between the estimated SOC value and the actual SOC value gradually increases. The first time required for the estimated SOC value to exceed the actual SOC value by the first deviation can be estimated based on the increasing speed of the SOC cumulative error.

[0048] A second time period required for the estimated SOC value to be less than the actual SOC value by the second deviation may be estimated based on the SOC cumulative error increasing speed.

[0049] To solve the above problem, in some non-limiting embodiments, the correction period may be determined according to the first duration and / or the second duration.

[0050] For example, when the allowable deviation of the SOC error includes a first deviation and a second deviation, the first time length and the second time length can be calculated. At this time, the minimum value of the first time length and the second time length can be taken as the correction period. Since after exceeding the first time length, the deviation between the estimated SOC value and the actual SOC value continues to expand and will exceed the allowed first deviation, at this time, the battery may not be able to output the output power actually required by the vehicle. After exceeding the second time length, the deviation between the estimated SOC value and the actual SOC value continues to expand and will exceed the allowed second deviation, which may result in the inability to effectively recover braking energy when the vehicle decelerates. Taking the minimum value of the first time length and the second time length as the correction period can avoid the phenomenon that the battery may not be able to output the output power actually required by the vehicle and the inability to effectively recover braking energy when the vehicle decelerates, thereby ensuring the normal use of the battery.

[0051] For another example, when the allowable deviation of the SOC error includes a first deviation, a first time duration may be calculated and used as a correction period.

[0052] For another example, when the allowable deviation of the SOC error includes a second deviation, a second time period can be calculated and used as the correction period.

[0053] In a specific implementation, the rate of increase in the SOC cumulative error can be preconfigured. When estimating the battery's SOC value based on current, a mapping relationship between the battery's usage time and the rate of increase in the SOC cumulative error can be preconfigured. The rate of increase in the SOC cumulative error can be the SOC error corresponding to the battery's usage time.

[0054] In some embodiments, the growth rate of the SOC cumulative error may increase linearly or nonlinearly.

[0055] From the above, it can be seen that when the battery is charged with an external power supply, if it is monitored that the cumulative working time of the battery meets the correction conditions, the SOC value of the battery is corrected, wherein the correction conditions include a correction period, and the correction period is determined based on the rising speed of the battery's SOC cumulative error and the allowable error deviation of the SOC. Therefore, the timing of the battery's SOC value correction is related to the rising speed of the SOC cumulative error and the allowable error deviation of the SOC. Therefore, the rationality of determining the correction timing of the battery's SOC can be improved to ensure the normal use of the battery.

[0056] In a specific implementation, if the accumulated operating time of the battery is monitored to have reached the calibration period, the fully charged SOC value of the battery is raised from a first threshold to a second threshold. The system continuously detects whether a plug-in signal is received. When a plug-in signal is detected, an SOC calibration request is generated. During the charging process, the battery charging voltage is detected. When the battery charging voltage reaches a first voltage threshold, the system, in response to the SOC calibration request, calibrates the SOC value corresponding to the first voltage threshold to the second threshold.

[0057] In some non-limiting embodiments, the first threshold value may range from 60% to 80%, and the second threshold value may range from 80% to 100%.

[0058] In some embodiments, the first threshold is set to 70%.

[0059] In some embodiments, the second threshold is set to 100%.

[0060] In a specific implementation, when the SOC value of the battery is calibrated, after the charging gun is inserted into the charging port, a corresponding gun plug signal will be generated. After the battery management system (BMS) receives the gun plug signal, the BMS sends a high voltage (BMS) request to the vehicle control system (HVECU). The BMS request is used to request high voltage power to complete the subsequent charging process. At the same time, the BMS determines whether the current cumulative working time of the battery meets the correction conditions. When the correction conditions are met, an SOC correction request is generated to increase the fully charged SOC value of the battery from the first threshold to the second threshold. Accordingly, if the cumulative working time of the battery does not meet the correction conditions, even if AC / DC charging is used, the HV ECU allows high voltage power to be supplied, but no SOC correction request is generated.

[0061] In some embodiments, after the SOC value corresponding to the first voltage threshold is corrected to the second threshold, the full charge SOC value is reduced from the second threshold to the first threshold. This ensures that the full charge SOC value supported by subsequent charging is the configured SOC value for normal vehicle operation, thereby maintaining the battery operating within an optimal SOC range. That is, after the full charge SOC value is raised to the second threshold, the full charge SOC value is continuously maintained at the second threshold until the SOC value corresponding to the first voltage threshold is corrected to the second threshold, at which point the full charge SOC value is reduced from the second threshold to the first threshold.

[0062] The first voltage threshold is related to the type of battery and the value of the second threshold. It is understandable that the first voltage threshold varies depending on the type of battery and the value of the second threshold, and the specific value of the first voltage threshold is not limited here.

[0063] In a specific implementation, after the SOC value corresponding to the first voltage threshold is corrected to the second threshold, the SOC correction request is terminated and a discharge request is generated. In response to the discharge request, a designated component is called to discharge the battery until the SOC value of the battery is reduced to a third threshold. After the SOC value of the battery is reduced to the third threshold, the accumulated operating time of the battery is reset to zero, and the accumulated operating time of the battery is re-monitored. In other words, the accumulated operating time of the battery is related to the correction of the SOC. After the SOC value of the battery is reduced to the third threshold, an SOC correction is completed. Each time an SOC correction is completed, the accumulated operating time of the battery is reset to zero, and the accumulated operating time of the battery is re-calculated.

[0064] In some embodiments, in response to the discharge request, during the process of calling a designated component to discharge the battery, before the SOC value of the battery drops to a third threshold, the user actively terminates charging by unplugging the charging connector. If the unplugging operation is detected before the SOC value of the battery drops to the third threshold, the accumulated operating time of the battery is reset to zero and the accumulated operating time of the battery is monitored again.

[0065] In some embodiments, in response to a discharge request, when a designated component is called to discharge the battery, the designated component may be controlled to operate at a set power.

[0066] In one embodiment of the present invention, the SOC value consumed by the designated component is calculated based on the set power of the designated component and the discharge current of the battery; and the remaining SOC value of the battery is calculated based on the SOC value consumed by the designated component until the remaining SOC value of the battery decreases to the third threshold value.

[0067] In another embodiment of the present invention, by detecting the voltage of the battery, when the voltage of the battery reaches a second voltage threshold, the SOC value corresponding to the second voltage threshold is used as the third threshold.

[0068] In an embodiment of the present invention, the designated component may include at least one of the following: a temperature control device, a water pump, and an air conditioner.

[0069] In practice, batteries are typically equipped with a temperature control device that regulates the battery's temperature. For example, the temperature control device may include a heating module and a cooling module. The heating module heats the battery when the battery's temperature falls below a first temperature threshold. The cooling module cools the battery when the battery's temperature rises above a second temperature threshold.

[0070] In one embodiment of the present invention, in order to quickly discharge the battery and quickly reduce the temperature to the third threshold, the temperature control module can be controlled to repeatedly heat up and cool down the battery within a set temperature range.

[0071] In another embodiment of the present invention, a water pump or a fan can be used to quickly consume the battery power to increase the speed at which the battery power drops to the third threshold. The water pump is used to provide water circulation power for the cooling water of the cooling module, and the fan is used to dissipate heat.

[0072] In a specific implementation, the first threshold may be equal to the third threshold, or may not be equal to the third threshold, and may be configured according to actual needs.

[0073] In a specific implementation, after the SOC value of the battery is reduced to the third threshold, the SOC correction of the battery is completed, the discharge request and the gun insertion signal are terminated, the cumulative working time of the battery is cleared, and the cumulative working time of the battery is re-monitored, waiting for the next SOC correction of the battery.

[0074] In a specific implementation, to ensure driving safety, during the battery discharge process using a designated component, if a user's gun-drawing operation is detected before the battery's SOC value drops to a third threshold, a discharge incomplete reminder is output. This alerts the user that the vehicle's discharge operation is incomplete, allowing the user to intuitively understand the vehicle's current charging stage and reminding the user to promptly complete the battery discharge through other means after drawing the gun.

[0075] In some application scenarios where timeliness of vehicle use is less critical, to further improve vehicle safety, in some embodiments, the charging gun can be locked before the battery's SOC value drops to a third threshold; after the battery's SOC value drops to the third threshold, the charging gun is unlocked. When the charging gun is locked, plugging and unplugging operations are restricted, meaning the user cannot unplug the charging gun from the vehicle. By forcing the fully charged battery to discharge, braking energy can be recovered during vehicle deceleration, improving driving safety.

[0076] Furthermore, to enhance driving safety while also meeting users' actual vehicle needs and improving user experience, the charging gun can be locked when the battery SOC value is detected to be above a first threshold or before the battery SOC value is reduced to a third threshold. Before the battery SOC value is reduced to the third threshold, if the user removes the gun, a discharge incomplete reminder is output and the charging gun remains locked. If the user removes the gun again, the gun is unlocked. Once unlocked, the user can unplug the gun.

[0077] In order to facilitate those skilled in the art to better understand and implement the embodiments of the present invention, refer to Figure 2 , a timing diagram of SOC correction of a battery in an embodiment of the present invention is given, and the following is combined with Figure 2 Battery SOC correction is described by way of a non-limiting example.

[0078] After the last battery SOC calibration is completed, the battery's cumulative operating hours are counted starting from zero. When the battery's cumulative operating hours reach the set duration corresponding to the calibration cycle, it is determined that the battery's cumulative operating hours meet the calibration conditions, and the battery's SOC value is calibrated. For example, if the battery's cumulative operating hours reach 40 hours, the battery's SOC value is calibrated. It should be noted that the battery's cumulative operating hours in the example shown are 40 hours. This is for illustrative purposes only; in practice, other values are possible and are not limited here.

[0079] When the cumulative operating time of the battery reaches the set time corresponding to the calibration period, the full charge SOC value is raised from the first threshold to the second threshold. For example, the full charge SOC value is raised from 70% to 100%. It should be noted that the first and second thresholds may also have other values, and the above examples do not limit the scope of protection of the present invention.

[0080] During the battery SOC calibration process, if the charging gun is detected to be plugged in, a plug-in signal will be generated. Figure 2 The second pulse of the mid-range gun signal. The BMS sends a BMS request to the HV ECU, requesting high voltage power to the HV ECU. The HV ECU responds to the BMS request and supplies high voltage power. When the vehicle is at high voltage, the battery can be charged and discharged.

[0081] When a gun plug signal is detected, the BMS generates a corresponding SOC correction request, see Figure 2 The first pulse of the SOC correction request is received during the AC / DC charging process. At this point, the battery SOC value increases as the battery charges. If the battery SOC value has not yet reached the first threshold, the plug-in signal is detected and the SOC correction request is terminated. The battery SOC correction was not successfully completed during this AC / DC charging process, and the battery awaits the next AC / DC charging cycle. At this point, the fully charged SOC remains at the second threshold, and the battery's cumulative operating time continues to be counted.

[0082] When the next gun insertion signal is detected, an SOC correction request is generated, such as Figure 2 The third pulse of the gun signal is the second pulse in the SOC correction request. As the battery is charged, the SOC value of the battery gradually increases. When the SOC value of the battery exceeds the first threshold and continues to increase, the battery voltage is detected. When the battery voltage reaches the first voltage threshold, the battery SOC is corrected to the second threshold. After the battery SOC is corrected to the second threshold, the SOC correction request is terminated and a discharge signal is generated (see Figure 2In the embodiment of the present invention, the fully charged SOC is lowered from the second threshold to the first threshold by a pulse corresponding to the discharge signal. In response to the discharge signal, a preset component can be called to discharge the battery until the battery SOC value is detected to have dropped to a third threshold. The third threshold can be the same as the first threshold.

[0083] When the battery's SOC is reduced to the third threshold, the gun insertion signal is terminated, the discharge signal is terminated, and the battery's SOC correction is completed. The battery's cumulative working time is reset, and the timing starts again. The battery's cumulative working time is continuously detected. When the battery's cumulative working time reaches the correction cycle, the next battery SOC correction begins.

[0084] The battery SOC correction method provided in the above embodiment may be executed by a BMS.

[0085] The embodiment of the present invention also provides a battery SOC correction device. Figure 3 , a schematic structural diagram of a battery SOC correction device according to an embodiment of the present invention is provided. The battery SOC correction device 30 may include:

[0086] Working time monitoring unit 31, used to monitor the cumulative working time of the battery;

[0087] The correction unit 32 is used to correct the SOC value of the battery when the battery is charged by an external power supply if it is monitored that the cumulative working time of the battery meets the correction condition, wherein the correction condition includes a correction period, and the correction period is determined based on the rising speed of the SOC cumulative error of the battery and the allowable error deviation of the SOC.

[0088] In a specific implementation, the specific working principle and working process of the battery SOC correction device 30 can refer to the description of the battery SOC correction method provided in the above embodiment of the present invention, and will not be repeated here.

[0089] An embodiment of the present invention further provides a storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored. When the computer program is run by a processor, the steps of the battery SOC correction method provided in any of the above embodiments of the present invention are executed.

[0090] An embodiment of the present invention further provides a terminal comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor runs the computer program, the steps of the battery SOC correction method provided in any of the above embodiments of the present invention are executed.

[0091] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in any computer-readable storage medium, which may include: ROM, RAM, disk or CD, etc.

[0092] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A battery SOC correction method, characterized in that: include: Monitor the cumulative working hours of the battery; When the battery is charged by an external power source, if it is monitored that the accumulated working time of the battery meets the correction condition, the SOC value of the battery is corrected; The correction condition includes a correction period, and the correction period is determined based on a rising speed of an SOC cumulative error of the battery and an allowable deviation of an SOC error; The calibration period is determined as follows: estimating, based on the rate of increase of the SOC cumulative error, a first time duration required for the deviation of the estimated SOC value from the actual SOC value to reach a first deviation; estimating, based on the rate of increase of the SOC cumulative error, a second time period required for the estimated SOC value to be less than the actual SOC value by a second deviation; The minimum value between the first time length and the second time length is determined as the correction period.

2. The battery SOC correction method according to claim 1, wherein: The allowable deviation of the SOC error includes a first deviation and / or a second deviation, wherein the first deviation is the maximum deviation allowed for the estimated SOC value to be greater than the actual SOC value, and the second deviation is the maximum deviation allowed for the estimated SOC value to be less than the actual SOC value.

3. The battery SOC correction method according to claim 1 or 2, characterized in that: If it is monitored that the accumulated operating time of the battery meets the correction condition, correcting the SOC value of the battery includes: When it is monitored that the accumulated working time of the battery reaches the calibration period, raising the fully charged SOC value of the battery from a first threshold value to a second threshold value; When a gun insertion signal is detected, an SOC correction request is generated; detecting a charging voltage of the battery; When it is detected that the charging voltage of the battery reaches a first voltage threshold, the SOC value corresponding to the first voltage threshold is corrected to the second threshold in response to the SOC correction request.

4. The battery SOC correction method according to claim 3, wherein: Also includes: After the SOC value corresponding to the first voltage threshold is corrected to the second threshold, the full charge SOC value is reduced from the second threshold to the first threshold.

5. The battery SOC correction method according to claim 3, wherein: Also includes: After the SOC value corresponding to the first voltage threshold is corrected to the second threshold, the SOC correction request is terminated and a discharge request is generated; In response to the discharge request, calling a designated component to discharge the battery until the SOC value of the battery is reduced to a third threshold; After the SOC value of the battery is reduced to a third threshold, the accumulated operating time of the battery is reset to zero, and the accumulated operating time of the battery is monitored again.

6. The battery SOC correction method according to claim 2, wherein: The first deviation is determined in the following manner: according to a preset SOC lower limit value and an actual SOC lower limit value, a difference between the preset SOC lower limit value and the actual SOC lower limit value is calculated, and the first deviation is determined according to the difference; The second deviation is determined in the following manner: the second deviation is determined according to the actual SOC value, the deceleration specified by laws and regulations, and a preset SOC upper limit value.

7. A battery SOC correction device, characterized in that: include: Working time monitoring unit, used to monitor the cumulative working time of the battery; a correction unit configured to, when the battery is charged by an external power source, correct the SOC value of the battery if it is monitored that the accumulated operating time of the battery satisfies a correction condition, wherein the correction condition includes a correction period, and the correction period is determined based on a rate of increase of a cumulative error in the SOC of the battery and an allowable deviation of the SOC error; The calibration period is determined as follows: estimating, based on the rate of increase of the SOC cumulative error, a first time duration required for the deviation of the estimated SOC value from the actual SOC value to reach a first deviation; estimating, based on the rate of increase of the SOC cumulative error, a second time period required for the estimated SOC value to be less than the actual SOC value by a second deviation; The minimum value between the first time length and the second time length is determined as the correction period.

8. A storage medium, wherein the storage medium is a non-volatile storage medium or a non-transient storage medium, and a computer program is stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery SOC correction method according to any one of claims 1 to 6 are executed.

9. A terminal comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor runs the computer program, the processor performs the steps of the battery SOC correction method according to any one of claims 1 to 6.

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