Vehicle battery health state correction method and device and storage medium

Abstract

The invention provides a vehicle battery health state correction method and device and a storage medium, and relates to the technical field of battery management. The method comprises the steps of obtaining a battery charging and discharging strategy of a target vehicle; if the battery charging and discharging strategy indicates that the battery does not meet the preset full-charging and full-discharging conditions, collecting a charge state of the battery at a first moment meeting a first battery charge state condition, a charge state of the battery at a second moment meeting a second battery charge state condition, and a battery current from the first moment to the second moment; and determining a first battery health state of the battery by adopting a preset capacity estimation method according to the charge state at the first moment, the charge state at the second moment, the battery current from the first moment to the second moment and the rated battery capacity of the battery. By adopting the preset capacity estimation method, the first battery health state of the battery can be determined without fully charging and discharging the battery, and the problem of low measurement precision of the battery health state under non-fully charging and non-discharging conditions in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and more specifically, to a method, device, and storage medium for correcting the health status of a vehicle battery. Background Technology

[0002] In the field of power battery management for electric and hybrid vehicles, the State of Health (SOH) is a core indicator for measuring the degree of battery degradation, remaining lifespan, and safety performance. Its measurement accuracy directly determines the effectiveness of the control strategy of the Battery Management System (BMS), the accuracy of the vehicle's range prediction, and the safety of power battery use. It is of paramount importance to ensuring the reliability of vehicle operation and the user experience.

[0003] Currently, most mainstream SOH measurement methods in the industry rely on pre-set SOH measurement models. These models estimate SOH by collecting real-time battery operating data and inputting it into the model. However, in practical applications, these SOH measurement models face significant accuracy degradation. Specifically, in vehicle control strategy design, limitations such as vehicle range requirements, charging time constraints, and user habit adaptation prevent the provision of fully charged and discharged operating strategies for the power battery. For example, to extend battery cycle life, some vehicle strategies set charging upper limits (e.g., stopping charging at 80%-90%) or discharging lower limits (e.g., triggering forced power-off protection when the remaining charge is below 10%-15%). In short-distance usage scenarios such as urban commuting, users rarely fully charge and discharge the battery, resulting in the power battery being in a partially charged and discharged cycle state for extended periods.

[0004] In existing SOH measurement models, most methods require the difference between the fully charged capacity and the empty capacity of the power battery (i.e., the actual usable capacity) to calculate SOH (usually defined as the ratio of actual usable capacity to initial rated capacity) based on the full range of State of Charge (SOC) variation data. When the vehicle cannot provide a full charge and discharge strategy, the BMS cannot obtain complete capacity data of the power battery across the entire SOC range, and therefore cannot accurately calculate the actual usable capacity of the battery. This results in the inability to estimate the true SOH value based on the capacity and SOC data, further exacerbating the problem of insufficient SOH measurement accuracy.

[0005] In summary, current SOH measurement technologies suffer from poor measurement accuracy and low reliability due to the lack of a full charge / discharge strategy in vehicles, making it difficult to meet the needs of electric vehicles and hybrid vehicles for accurate monitoring of the power battery's health status. There is an urgent need to propose an SOH measurement method that can overcome the above-mentioned defects in order to improve SOH measurement accuracy and ensure the safe and stable operation of the power battery. Summary of the Invention

[0006] This application addresses the shortcomings of the prior art by providing a method, apparatus, and storage medium for correcting the health status of a vehicle battery, thereby resolving the problems existing in the prior art.

[0007] The technical solution adopted in the embodiments of this application is as follows: In a first aspect, embodiments of this application provide a method for correcting the health status of a vehicle battery, including: Obtain the battery charging and discharging strategy of the target vehicle; If the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, then the state of charge of the battery at the first moment when it meets the first battery state of charge condition, the state of charge at the second moment when it meets the second battery state of charge condition, and the battery current from the first moment to the second moment are collected. Based on the state of charge at the first moment, the state of charge at the second moment, the battery current from the first moment to the second moment, and the rated battery capacity of the battery, a preset capacity estimation method is used to determine the first battery health state of the battery.

[0008] In one embodiment, the method further includes: Obtain the current temperature and state of charge of the battery; Based on the current temperature and state of charge, a preset battery aging model is used to calculate the second battery health state of the battery. Obtain a first weight parameter and a second weight parameter when the battery does not meet the preset full charge / discharge conditions; wherein, the first weight parameter is less than the second weight parameter; Based on the first weight parameter and the second weight parameter, a weighted calculation is performed on the first battery health state and the second battery health state to obtain the target battery health state of the battery at the current time.

[0009] In one embodiment, obtaining the first weight parameter and the second weight parameter when the battery does not meet the preset full charge / discharge conditions includes: The weight parameter when the battery does not meet the battery fully discharged condition but meets the battery fully charged condition is determined as the first weight parameter corresponding to the first condition. Based on the first weight parameter corresponding to the first condition, determine the second weight parameter corresponding to the first condition; The weight parameter when the battery does not meet the conditions of full discharge or full charge is determined as the first weight parameter corresponding to the second condition; the first weight parameter corresponding to the first condition is greater than the first weight parameter corresponding to the second condition. Based on the first weight parameter corresponding to the second condition, determine the second weight parameter corresponding to the second condition.

[0010] In one embodiment, if the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, then collecting the state of charge of the battery at a first moment when it meets the first battery state of charge condition, the state of charge at a second moment when it meets the second battery state of charge condition, and the battery current from the first moment to the second moment includes: If the battery's charging and discharging strategy indicates that the battery does not meet the battery's full discharge condition but meets the battery's full charge condition, then after the battery is fully charged, the time when the battery is fully charged is determined as the first time, and the state of charge at the first time is collected. The battery is discharged starting from the first moment, and the battery current is collected. When the battery discharges to a first preset battery capacity, the time when the battery discharges to the first preset battery capacity is determined as the second time, and the battery current from the first time to the second time, as well as the state of charge at the second time, are obtained.

[0011] In one embodiment, if the battery's charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, collecting the battery's state of charge at a first moment when it meets the first battery state of charge condition, the state of charge at a second moment when it meets the second battery state of charge condition, and the battery current from the first moment to the second moment includes: If the battery's charging and discharging strategy indicates that the battery does not meet the conditions for full discharge or full charge, then when the battery's state of charge reaches the second state of charge, the battery is charged with constant current. During the process of charging the battery to the third state of charge, the first time point and the second time point are acquired. The state of charge at the first moment, the state of charge at the second moment, and the battery current from the first moment to the second moment are collected.

[0012] In one embodiment, acquiring the first time point and the second time point during the process of charging the battery to the third state of charge includes: During the process of charging the battery to the third state of charge, the start time of the period with the largest charging slope is determined as the first moment, and the end time of the period with the largest charging slope is determined as the second moment.

[0013] In one embodiment, the method further includes: If the target battery health status at the current moment is greater than the displayed battery health status at the previous moment, the difference in battery health status is determined based on the target battery health status and the displayed battery health status. Based on the differences in battery health status, estimate the expected storage time at the corresponding temperature starting from the current moment, and maintain the display of the battery health status during the expected storage time.

[0014] In one embodiment, the method further includes: If the target battery health status at the current moment is less than the displayed battery health status at the previous moment, the displayed battery health status is decayed, and the decayed displayed battery health status is dynamically updated until the updated displayed battery health status is consistent with the target battery health status.

[0015] Secondly, embodiments of this application also provide an electronic device, including: a processor, a storage medium, and a bus. The storage medium stores program instructions executable by the processor. When the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the program instructions to implement the vehicle battery health state correction method described in any of the above embodiments.

[0016] Thirdly, embodiments of this application also provide a readable storage medium storing program instructions, which, when executed by a processor, implement the vehicle battery health state correction method described in any of the above embodiments.

[0017] The beneficial effects of this application are: This application provides a method for correcting the health status of a vehicle battery. It adopts a preset capacity estimation method, which can determine the first battery health status without fully charging and discharging the battery, thus solving the problem of low accuracy in measuring battery health status under non-fully charged and discharged conditions in the prior art. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the flowcharts illustrating a method for correcting the health status of a vehicle battery provided in an embodiment of this application. Figure 2 A second schematic flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment; Figure 3 The third flowchart illustrates the method for correcting the health status of a vehicle battery provided in this application embodiment; Figure 4 The correspondence between voltage and state of charge provided in this application; Figure 5 The fourth flowchart illustrates the method for correcting the health status of a vehicle battery provided in this application embodiment. Figure 6 Fifth flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment; Figure 7 A flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment is shown in Figure 6. Figure 8 A schematic diagram of the structure of the vehicle battery health status correction device provided in the embodiments of this application; Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] Furthermore, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0024] This application provides a method for correcting the health status of a vehicle battery. This method can be generated by any electronic device with computing and processing capabilities, such as a terminal-facing computer or a backend server. The following, in conjunction with the accompanying drawings, provides specific examples illustrating the method for correcting the health status of a vehicle battery provided in this application.

[0025] Figure 1 This is one of the flowcharts illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment, such as... Figure 1 As shown, the method includes: S101. Obtain the battery charging and discharging strategy of the target vehicle.

[0026] The Battery Management System (BMS) establishes communication with the Vehicle Control Unit (VCU) via the vehicle's CAN bus and sends a "Battery Charge / Discharge Strategy Query Request" signal to obtain the charge / discharge strategy feedback from the VCU. This strategy includes three core parameters: "Allowable Full Charge Threshold," "Allowable Full Discharge Threshold," and "Charge / Discharge Power Limit." After parsing, the BMS determines whether the preset full charge / discharge conditions are met. The preset full charge / discharge conditions are defined as "Allowable full charge threshold ≤ 100% (i.e., supports full charge) and allowable full discharge threshold ≥ 0% (i.e., supports full discharge), and there is no charge / discharge power limit that would prevent the full charge / discharge state from being achieved."

[0027] If the analysis reveals that the policy allows a full discharge threshold > 0% (e.g., limiting the minimum SOC to 20%), or allows a full charge threshold < 100% (e.g., limiting the maximum SOC to 90%), then it is determined that "the battery does not meet the preset full charge and discharge conditions," triggering step S102.

[0028] S102. If the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, then collect the state of charge of the battery at the first moment when the battery meets the first state of charge condition, the state of charge at the second moment when the battery meets the second state of charge condition, and the battery current from the first moment to the second moment.

[0029] The BMS monitors changes in the battery's State of Charge (SOC) in real time. When the SOC reaches the first battery state of charge condition, this moment is recorded as... and according to The state of charge at time 1 is calculated from the open circuit voltage (OCV) at time 2. When the State of Charge (SOC) reaches the second battery state of charge condition, record that moment as... and according to The state of charge at time 2 is calculated from the open-circuit voltage OCV at time 1. At the same time, arrive During the specified time period, the BMS collects the battery current in real time through a shunt connected in series in the battery main circuit. The system distinguishes between charging current (recorded as positive value) and discharging current (recorded as negative value), and stores the current data in the BMS data buffer in the "time-current value" format to ensure no data loss.

[0030] Here, SOC stands for State of Charge, representing the percentage of the battery's current remaining charge relative to its rated capacity; OCV is the Open Circuit Voltage, the voltage across the battery when no current is flowing through it. There is a correlation between the battery's Open Circuit Voltage and its State of Charge, which is determined by measuring the open circuit voltage at different times. and Given the open-circuit voltage, the state of charge at the corresponding moment can be obtained by combining this correspondence. and The difference between the two reflects the time interval [ , The change in the state of charge of the internal battery.

[0031] S103. Based on the state of charge at the first moment, the state of charge at the second moment, the battery current from the first moment to the second moment, and the rated battery capacity, a preset capacity estimation method is used to determine the first battery health state of the battery.

[0032] Based on S102 data acquisition , , Data, combined with battery rated capacity ( Pre-stored in the BMS, it is the battery's rated capacity at the time of manufacture, which is the maximum amount of electricity the battery can store under ideal conditions (unit: Ah). The first battery health state is calculated using a capacity estimation method. Specifically, as shown in Formula 1: (1) in, Indicates within the time interval [ , Within this time period, the battery current I(t) is integrated, and the result of the integration reflects the charge and discharge capacity of the battery during this time period. It compares the charge / discharge capacity within the time interval [tb, ta] with the battery's rated capacity, resulting in a relative value based on the charge / discharge capacity within that time period. This can be understood as a quantity related to the proportion of charge / discharge to the rated capacity. The entire formula means: by comparing the "time interval [tb, ta]"... , The first battery health state is determined by the ratio of internal charge / discharge capacity to rated capacity and the change in state of charge within that time interval. .

[0033] In summary, this embodiment provides a method for correcting the health status of a vehicle battery. By using a preset capacity estimation method, the first battery health status can be determined without fully charging and discharging the battery, thus solving the problem of low accuracy in measuring battery health status under non-fully charged and discharged conditions in the prior art.

[0034] Figure 2 This is a second schematic flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment. Figure 2 As shown, the method of this application further includes: S201. Obtain the battery's temperature and state of charge at the current moment.

[0035] BMS obtains the current temperature of the battery. ) and real-time SOC value (denoted as ).

[0036] S202. Based on the current temperature and state of charge, use a preset battery aging model to calculate the second battery health state.

[0037] Input the temperature T and SOC_current into the preset battery aging model. First, calculate the calendar aging capacity loss using the calendar aging model according to Formula 2. Then, calculate the cycle aging capacity loss using the cycle aging model according to Formula 3. The total loss is calculated as follows. = + Then based on the total loss Calculate the health status of the second battery .

[0038] (2) (3) (4) in, It is a calendar aging function. It is a cyclic aging function. The parameters are obtained by looking up a table. It is the initial value of the battery's health status calculated by a preset algorithm at the initial moment when the battery is put into use, based on its core parameters such as rated capacity, internal resistance, and voltage characteristics at the time of manufacture.

[0039] In a theoretically ideal state, a brand new battery that has not undergone any damage, its The theoretical value is 100%, but in practical applications, it is affected by a variety of factors. It is often difficult to maintain 100% of the ideal value. For example, even if battery manufacturers follow uniform standards during the production process, there may be slight individual differences in key indicators such as the purity of the active material in the cell and the uniformity of the electrode coating. This can cause the actual capacity of some new batteries to be slightly lower than the rated capacity when they leave the factory. In addition, if the battery undergoes a long period of storage from the factory to the user, it may also experience a very small amount of capacity loss due to slight calendar aging. Ultimately, this can result in the initial SOH (Solution of Hazard) being lower than 100% when the battery is put into use (which is usually in the range of 95%-100%, and is within the industry's acceptable initial deviation range).

[0040] S203. Obtain the first weight parameter and the second weight parameter when the battery does not meet the preset full charge and discharge conditions.

[0041] Wherein, the first weight parameter K is the weight of the first battery health state, and the second weight parameter 1-K is the weight of the second battery health state, specifically, as follows: Figure 3 As shown, S203 may include S301~S304: S301. Determine the weight parameter when the battery does not meet the battery fully discharged condition but meets the battery fully charged condition as the first weight parameter corresponding to the first condition.

[0042] Figure 4 The correspondence between voltage and state of charge provided in this application is as follows: Figure 4As shown, when the battery pack only supports full charging but not full discharging, the two points a and b for calculating the State of Charge (SOH) are point 3 (the point at full charge) and point 2, respectively. Since the SOC after OCV correction and after full charging is generally a very accurate SOC, calculating SOH in this way will be relatively accurate. However, in actual testing, the SOH measured by this capacity method still has some temperature difference. Through extensive data verification and comparison, the first weight parameter K corresponding to the first condition is calculated to be 0.12. Under this condition, the calculation using weighted inertia is the closest to the actual SOH value of the battery pack.

[0043] S302. Determine the second weight parameter corresponding to the first condition based on the first weight parameter corresponding to the first condition.

[0044] The sum of the first weight parameter and the second weight parameter is 1. Therefore, the second weight parameter corresponding to the first condition is 0.88.

[0045] S303. Determine the weight parameter when the battery does not meet the conditions for full discharge or full charge as the first weight parameter corresponding to the second condition.

[0046] When the battery pack does not support full charging or full discharging, the two points 'a' and 'b' for calculating the State of Charge (SOH) are points 1 and 2, respectively. This calculation has a prerequisite: the battery pack must be charged at a constant current after a power request is initiated. Within the SOC range of 30% to 70%, the starting points with the larger slope of the voltage / SOC ratio are used as points 'a' and 'b' for SOH calculation. Since the voltage values ​​at points 'a' and 'b' are not significantly different in practical applications, and voltage measurement also has errors, the SOH calculated in this way will be less accurate than the SOH calculated under full charge and discharge conditions. Through extensive verification and repeated calculations, it was found that when the first weighting parameter K corresponding to the second condition is 0.02, the SOH calculated using weighted inertia is closest to the actual SOH value of the battery pack. The first weighting parameter corresponding to the first condition is greater than the first weighting parameter corresponding to the second condition; that is, 0.12 is greater than 0.02.

[0047] S304. Determine the second weight parameter corresponding to the second condition based on the first weight parameter corresponding to the second condition.

[0048] The sum of the first and second weight parameters is 1, therefore, the second weight parameter corresponding to the second condition is 0.98.

[0049] S204. Based on the first weight parameter and the second weight parameter, perform a weighted calculation on the first battery health state and the second battery health state to obtain the target battery health state at the current moment.

[0050] The first battery health state is determined based on the first weight parameter K and the second weight parameter 1-K. Second battery health status By performing a weighted calculation and applying Formula 5, the target battery health status at the current moment is obtained. .

[0051] (5) Optionally, when the battery pack supports full charging and discharging, the SOH calculated using the preset capacity estimation method is the most accurate SOH of the battery pack. Therefore, the value of the first weight parameter K is 1, which is regarded as the true SOH, and the value of the second weight parameter 1-K is 0.

[0052] Figure 5 This is the fourth flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment. Figure 5 As shown, in one embodiment, if the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, then collecting the state of charge of the battery at a first moment when the battery meets the first state of charge condition, the state of charge at a second moment when the battery meets the second state of charge condition, and the battery current from the first moment to the second moment, as described in S102, may include: S401. If the battery's charging and discharging strategy indicates that the battery does not meet the conditions for full discharge but meets the conditions for full charge, then after the battery is fully charged, the moment when the battery is fully charged is determined as the first moment, and the state of charge at the first moment is collected.

[0053] After the battery is fully charged (corresponding to) Figure 4 (Point 3), BMS determines the full charge time as the first moment. ,collection State of charge at time t .

[0054] S402. Start discharging the battery from the first moment and collect the battery current.

[0055] from The battery is discharged at any time, and the battery current is collected.

[0056] S403. When the battery discharges to the first preset battery capacity, determine the time when the battery discharges to the first preset battery capacity as the second time, and obtain the battery current from the first time to the second time, as well as the state of charge at the second time.

[0057] When the battery discharges to a first preset battery capacity (e.g., 60%), corresponding to Figure 4 Point 2), the moment when the battery discharges to the first preset battery capacity is determined as the second moment. and obtain the first moment By the second moment Battery current and the second moment State of charge .

[0058] Figure 6 This is the fifth flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment. Figure 6 As shown, in another embodiment, if the battery's charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, the step S102, which involves collecting the battery's state of charge at a first moment when it meets the first battery state of charge condition, the state of charge at a second moment when it meets the second battery state of charge condition, and the battery current from the first moment to the second moment, may include: S501. If the battery's charging and discharging strategy indicates that the battery does not meet the conditions for full discharge or full charge, then when the battery's state of charge reaches the second state of charge, the battery is charged with constant current.

[0059] When the battery's state of charge reaches the second state of charge (e.g., 30%), corresponding to... Figure 4 At point 1, the BMS triggers a power replenishment request and controls the battery to charge in constant current mode.

[0060] S502. During the process of charging the battery to the third state of charge, acquire the first moment and the second moment.

[0061] During the process of charging the battery to the third state of charge, the starting time of the period with the largest charging slope is determined as the first moment. The end time of the period with the largest charging slope is determined as the second moment. .

[0062] S503: Collect the state of charge at the first moment, the state of charge at the second moment, and the battery current from the first moment to the second moment.

[0063] Start time of the period with the largest charging slope State of charge The end time of the period with the largest charging slope State of charge and the first moment By the second moment Battery current .

[0064] Figure 7 This is the sixth flowchart illustrating the method for correcting the health status of a vehicle battery provided in this application embodiment. Figure 7 As shown, the method of this application further includes: S601. If the target battery health status at the current moment is greater than the displayed battery health status at the previous moment, determine the difference in battery health status based on the target battery health status and the displayed battery health status.

[0065] During normal operation, the battery's State of Health (SOH) will only decrease, not increase. The BMS compares the current target battery health SOH with the displayed SOH from the previous moment. 显 The displayed value is adjusted according to the principle of "no increase and no rapid decrease".

[0066] If the target battery health status SOH at the current moment is greater than the battery's displayed battery health status SOH at the previous moment... 显 Based on the target battery health status and the displayed battery health status, determine the difference in battery health status. =SOH-SOH 显 .

[0067] S602. Based on the differences in battery health status, estimate the expected storage time at the corresponding temperature starting from the current moment, and maintain the display of battery health status during the expected storage time.

[0068] Since SOH cannot increase, the estimated storage time T1 is estimated based on ΔSOH and the current temperature T. The battery health status is maintained on the display for time T1 until the calculated target battery health status SOH equals SOH. 显 .

[0069] In one embodiment, if the target battery health state SOH at the current moment is less than the displayed battery health state SOH at the previous moment... 显 If the battery health status is decayed, the decayed battery health status will be dynamically updated until the updated battery health status SOH is reached. 显 Consistent with the target battery state of health (SOH).

[0070] The apparatus, device, and storage medium for implementing the vehicle battery health status correction method provided in any of the above embodiments of this application will be explained below. The specific implementation process and the resulting technical effects are the same as those in the corresponding method embodiments. For the sake of brevity, the parts not mentioned in the following embodiments can be referred to the corresponding content in the method embodiments.

[0071] Figure 8 This is a schematic diagram of the structure of the vehicle battery health status correction device provided in the embodiments of this application, as shown below. Figure 8 As shown, this application provides a device for correcting the health status of a vehicle battery, comprising: The acquisition module 10 is used to acquire the battery charging and discharging strategy of the target vehicle.

[0072] The acquisition module 20 is used to acquire the state of charge of the battery at a first moment when the battery meets the first state of charge condition, the state of charge at a second moment when the battery meets the second state of charge condition, and the battery current from the first moment to the second moment if the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions.

[0073] The determination module 30 is used to determine the first battery health state of the battery based on the state of charge at the first time, the state of charge at the second time, the battery current from the first time to the second time, and the rated battery capacity of the battery, using a preset capacity estimation method.

[0074] Optionally, the acquisition module 10 is further configured to acquire the temperature and state of charge of the battery at the current moment; the determination module 30 is further configured to calculate the second battery health state of the battery based on the temperature and state of charge at the current moment using a preset battery aging model.

[0075] The acquisition module 10 is further configured to acquire a first weight parameter and a second weight parameter when the battery does not meet the preset full charge / discharge conditions; wherein the first weight parameter is less than the second weight parameter. The determination module 30 is further configured to perform a weighted calculation on the first battery health state and the second battery health state based on the first weight parameter and the second weight parameter to obtain the target battery health state of the battery at the current time.

[0076] Optionally, the acquisition module 10 is further configured to: determine a weight parameter when the battery does not meet the battery full discharge condition but meets the battery full charge condition as a first weight parameter corresponding to the first condition; determine a second weight parameter corresponding to the first condition based on the first weight parameter corresponding to the first condition; determine a weight parameter when the battery does not meet either the battery full discharge condition or the battery full charge condition as a first weight parameter corresponding to the second condition; the first weight parameter corresponding to the first condition is greater than the first weight parameter corresponding to the second condition; and determine a second weight parameter corresponding to the second condition based on the first weight parameter corresponding to the second condition.

[0077] Optionally, the acquisition module 20 is further configured to: if the battery's charging and discharging strategy indicates that the battery does not meet the battery's full discharge condition but meets the battery's full charge condition, then after the battery is fully charged, determine the time when the battery is fully charged as the first time and acquire the state of charge at the first time; start discharging the battery from the first time and acquire the battery current; when the battery discharges to a first preset battery capacity, determine the time when the battery discharges to the first preset battery capacity as the second time and acquire the battery current from the first time to the second time, as well as the state of charge at the second time.

[0078] Optionally, the acquisition module 20 is further configured to, if the battery's charging and discharging strategy indicates that the battery does not meet the conditions for full discharge or full charge, perform constant current charging on the battery when the battery's state of charge reaches the second state of charge; acquire the first time and the second time during the process of charging the battery to the third state of charge; acquire the state of charge at the first time, the state of charge at the second time, and the battery current from the first time to the second time.

[0079] Optionally, the acquisition module 20 is further configured to determine the start time of the time period with the largest charging slope as the first moment during the process of charging the battery to the third state of charge, and to determine the end time of the time period with the largest charging slope as the second moment.

[0080] Optionally, the device further includes an update module, configured to: if the target battery health status at the current moment is greater than the displayed battery health status at the previous moment, determine the battery health status difference based on the target battery health status and the displayed battery health status; estimate the expected storage time at a corresponding temperature starting from the current moment based on the battery health status difference, and maintain the displayed battery health status for the expected storage time.

[0081] Optionally, the update module is further configured to, if the target battery health status at the current moment is less than the displayed battery health status at the previous moment, decay the displayed battery health status and dynamically update the decayed displayed battery health status until the updated displayed battery health status is consistent with the target battery health status.

[0082] The above-described device is used to execute the method provided in the foregoing embodiments, and its implementation principle and technical effect are similar, so they will not be described again here.

[0083] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0084] Figure 9 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application, such as... Figure 9 As shown, this application also provides an electronic device, including a processor 100, a storage medium 200, and a bus 300. The storage medium stores program instructions executable by the processor. When the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the program instructions to implement the vehicle battery health state correction method described in any of the above embodiments.

[0085] This application also provides a readable storage medium storing program instructions, which, when executed by a processor, implement the vehicle battery health state correction method described in any of the above embodiments.

[0086] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0087] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0088] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0089] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0090] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for correcting the health status of a vehicle battery, characterized in that, include: Obtain the battery charging and discharging strategy of the target vehicle; If the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, then the state of charge of the battery at the first moment when it meets the first battery state of charge condition, the state of charge at the second moment when it meets the second battery state of charge condition, and the battery current from the first moment to the second moment are collected. Based on the state of charge at the first moment, the state of charge at the second moment, the battery current from the first moment to the second moment, and the rated battery capacity of the battery, a preset capacity estimation method is used to determine the first battery health state of the battery.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the current temperature and state of charge of the battery; Based on the current temperature and state of charge, a preset battery aging model is used to calculate the second battery health state of the battery. Obtain a first weight parameter and a second weight parameter when the battery does not meet the preset full charge / discharge conditions; wherein, the first weight parameter is less than the second weight parameter; Based on the first weight parameter and the second weight parameter, a weighted calculation is performed on the first battery health state and the second battery health state to obtain the target battery health state of the battery at the current time.

3. The method according to claim 2, characterized in that, The step of obtaining the first weight parameter and the second weight parameter when the battery does not meet the preset full charge / discharge conditions includes: The weight parameter when the battery does not meet the battery fully discharged condition but meets the battery fully charged condition is determined as the first weight parameter corresponding to the first condition. Based on the first weight parameter corresponding to the first condition, determine the second weight parameter corresponding to the first condition; The weight parameter when the battery does not meet the conditions of full discharge or full charge is determined as the first weight parameter corresponding to the second condition; the first weight parameter corresponding to the first condition is greater than the first weight parameter corresponding to the second condition. Based on the first weight parameter corresponding to the second condition, determine the second weight parameter corresponding to the second condition.

4. The method according to claim 1, characterized in that, If the battery charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, then the state of charge of the battery at a first moment when it meets the first battery state of charge condition, the state of charge at a second moment when it meets the second battery state of charge condition, and the battery current from the first moment to the second moment are collected, including: If the battery's charging and discharging strategy indicates that the battery does not meet the battery's full discharge condition but meets the battery's full charge condition, then after the battery is fully charged, the time when the battery is fully charged is determined as the first time, and the state of charge at the first time is collected. The battery is discharged starting from the first moment, and the battery current is collected. When the battery discharges to a first preset battery capacity, the time when the battery discharges to the first preset battery capacity is determined as the second time, and the battery current from the first time to the second time, as well as the state of charge at the second time, are obtained.

5. The method according to claim 1, characterized in that, If the battery's charging and discharging strategy indicates that the battery does not meet the preset full charge and discharge conditions, the state of charge (SOC) of the battery at a first moment when it meets the first SOC condition, the SOC at a second moment when it meets the second SOC condition, and the battery current from the first moment to the second moment are collected, including: If the battery's charging and discharging strategy indicates that the battery does not meet the conditions for full discharge or full charge, then when the battery's state of charge reaches the second state of charge, the battery is charged with constant current. During the process of charging the battery to the third state of charge, the first time point and the second time point are acquired. The state of charge at the first moment, the state of charge at the second moment, and the battery current from the first moment to the second moment are collected.

6. The method according to claim 5, characterized in that, The process of acquiring the first moment and the second moment during the charging of the battery to the third state of charge includes: During the process of charging the battery to the third state of charge, the start time of the period with the largest charging slope is determined as the first moment, and the end time of the period with the largest charging slope is determined as the second moment.

7. The method according to claim 2, characterized in that, The method further includes: If the target battery health status at the current moment is greater than the displayed battery health status at the previous moment, the difference in battery health status is determined based on the target battery health status and the displayed battery health status. Based on the differences in battery health status, estimate the expected storage time at the corresponding temperature starting from the current moment, and maintain the display of the battery health status during the expected storage time.

8. The method according to claim 2, characterized in that, The method further includes: If the target battery health status at the current moment is less than the displayed battery health status at the previous moment, the displayed battery health status is decayed, and the decayed displayed battery health status is dynamically updated until the updated displayed battery health status is consistent with the target battery health status.

9. An electronic device, characterized in that, include: The device includes a processor, a storage medium, and a bus, wherein the storage medium stores program instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the program instructions to implement the method for correcting the health status of a vehicle battery as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that, The readable storage medium stores program instructions that, when executed by a processor, implement the method for correcting the vehicle battery health status as described in any one of claims 1 to 7.

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