Battery recharging method, vehicle-mounted electronic control unit and vehicle

Abstract

The invention provides a battery recharging method, a vehicle-mounted electronic control unit and a vehicle, and relates to the technical field of electric vehicles. The method comprises the steps of obtaining current battery parameters of a battery on a vehicle; predicting a voltage value of the battery at a certain moment in the future according to the current battery parameter and the prediction time window to obtain a voltage prediction value; if it is judged that the voltage predicted value is larger than the overvoltage voltage threshold value, reducing the standard allowable feedback power by using a feedback power reduction strategy to obtain target allowable feedback power; wherein the target allowable feedback power is used for limiting the recharging power of the battery. The voltage prediction value of a period of time in the future is predicted by using the current battery condition of the vehicle, and whether the allowable feedback power needs to be reduced in advance is determined based on the voltage prediction value to limit the recharging power of the battery, so that the overvoltage occurrence probability is reduced, the energy utilization rate is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more specifically, to a battery recharge method, an on-board electronic control unit, and a vehicle. Background Technology

[0002] Regenerative braking technology is a core component of the energy management system for electric and hybrid vehicles. This technology utilizes the reversibility of the electric motor to convert kinetic energy into electrical energy stored in the battery during vehicle deceleration or braking. Specifically, when the driver releases the accelerator pedal and enters a coasting state, the vehicle controller switches the motor to generator mode, adjusting the recovery intensity according to the set feedback level.

[0003] However, as the vehicle is used for longer periods, the battery's DC internal resistance will increase. Controlling it solely through the factory-set feedback power meter will lead to a mismatch between the feedback power and the battery's actual state, resulting in excessively high or low feedback power, causing overvoltage problems or insufficient energy recovery, and affecting the battery's lifespan. Summary of the Invention

[0004] The purpose of this application is to provide a battery recharge method, an on-board electronic control unit, and a vehicle, which uses the current battery status of the vehicle to predict the voltage prediction value for a future period of time, and determines whether it is necessary to reduce the allowable feedback power in advance based on the voltage prediction value to limit the battery recharge power, thereby reducing the probability of overvoltage, improving energy utilization, and extending the battery's service life.

[0005] In a first aspect, embodiments of this application provide a battery recharge method, the method comprising: acquiring current battery parameters of a battery in a vehicle; predicting the voltage value of the battery at a future time according to the current battery parameters and a prediction time window, thereby obtaining a voltage prediction value; if it is determined that the voltage prediction value is greater than an overvoltage threshold, then using a feedback power reduction strategy to reduce the standard allowable feedback power to obtain a target allowable feedback power; wherein, the target allowable feedback power is used to limit the recharge power of the battery.

[0006] In this embodiment, the voltage prediction value for a future period of time is predicted by using the current battery parameters of the vehicle battery to know the battery voltage situation for a future period of time. When the voltage prediction value is greater than the overvoltage threshold, the standard allowable feedback power is reduced by using a feedback power reduction strategy. In order to limit the battery recharge power by reducing the allowable feedback power in advance, reduce the probability of overvoltage, improve energy utilization, and extend the battery life.

[0007] In some embodiments, the current battery parameters include the current remaining charge value, the current battery temperature value, and the current battery voltage value. Based on the current battery parameters, the voltage value of the battery at a future time is predicted according to a prediction time window to obtain a voltage prediction value, including: determining the aging voltage value of the battery using the current remaining charge value and the current battery temperature value; obtaining the battery voltage starting value in the previous historical time window; determining the voltage change value of the battery at a future time based on the battery voltage starting value and the current battery voltage value; and determining the voltage prediction value based on the current battery voltage value, the aging voltage value, and the voltage change value.

[0008] In this embodiment, considering battery aging, the aging voltage value is determined by the current remaining charge and current battery temperature, reflecting the impact of battery aging on the predicted voltage value. The voltage change value at a future point in time is determined based on the initial battery voltage value from the previous historical time window, reflecting the impact of historical battery voltage values ​​on the predicted voltage value. The current battery voltage value reflects the current condition of the battery. Therefore, determining the predicted voltage value using the aging voltage value, voltage change value, and current voltage value improves the accuracy of the predicted voltage value.

[0009] In some embodiments, determining the battery aging voltage value using the current remaining charge value and the current battery temperature value includes: determining the battery's allowable recharge current and current battery resistance using the current remaining charge value and the current battery temperature value; and determining the battery aging voltage value based on the allowable recharge current and the current battery resistance.

[0010] In this embodiment, the aging voltage value is determined by the allowed recharge current and the current battery resistance to assess the battery's health status. Including the aging voltage value as one of the factors in determining the predicted voltage value improves the accuracy of the predicted voltage value.

[0011] In some embodiments, determining the predicted voltage value based on the current battery voltage value, the aging voltage value, and the voltage change value includes: using a formula Determine the predicted voltage value; where, This represents the predicted voltage value. This indicates the current battery voltage value. Indicates the aging voltage value. It represents the change in battery voltage at a future point in time.

[0012] The embodiments of this application improve the accuracy of voltage prediction by using the sum of the aging voltage value, the voltage change value, and the current voltage value as the voltage prediction value.

[0013] In some embodiments, if the predicted voltage value is determined to be greater than the overvoltage threshold, the standard allowable feedback power is reduced using a feedback power reduction strategy to obtain a target allowable feedback power, including: if the predicted voltage value is determined to be greater than the overvoltage threshold, a target reduction rate is determined based on the difference between the predicted voltage value and the overvoltage threshold; the standard allowable feedback power is reduced according to the target reduction rate to obtain the target allowable feedback power.

[0014] In this embodiment, the allowable feedback power reduction rate is dynamically adjusted by the difference between the voltage prediction value and the overvoltage threshold, so that the allowable feedback power reduction process is smooth, improving energy utilization and extending battery life.

[0015] In some embodiments, after obtaining the target allowable feedback power, the method further includes: obtaining the current actual voltage and current actual current of the battery; if it is determined that the current actual voltage is greater than a first preset voltage threshold, then calculating the actual feedback power of the battery based on the current actual voltage and current actual current; wherein the overvoltage threshold is less than the first preset voltage threshold; if it is determined that the difference between the target allowable feedback power and the actual feedback power is greater than a preset power threshold, then reducing the target allowable feedback power to the actual feedback power within a preset time, and using the actual feedback power to limit the recharge power of the battery.

[0016] In this embodiment, considering the overvoltage problem caused by an excessively long allowable feedback power decay time, after reducing the standard allowable feedback power, if the current actual battery voltage is greater than a first preset voltage threshold, and the target allowable feedback power still differs significantly from the actual feedback power, the target allowable feedback power is rapidly reduced to the actual feedback power within a preset time. In this process, by increasing the allowable feedback power decay rate, it is ensured that the allowable feedback power is reduced to a reasonable range in advance, further reducing the probability of overvoltage problems, improving energy utilization, and extending battery life.

[0017] In some embodiments, during the process of reducing the target allowable feedback power to the actual feedback power, the method further includes: if it is determined that the current actual voltage value of the battery is less than a second preset voltage threshold, then stop the process of reducing the target allowable feedback power and obtain an intermediate allowable feedback power, and use the intermediate allowable feedback power to limit the recharge power of the battery; wherein, the second preset voltage threshold is less than the first preset voltage threshold, and the overvoltage threshold is less than the second preset voltage threshold.

[0018] In this embodiment of the application, if the current actual voltage value of the battery is determined to be less than the second preset voltage threshold during the process of rapidly reducing the target allowable feedback power to the actual feedback power, the rapid reduction process is terminated, so that the final allowable feedback power is adapted to the current actual situation of the battery, thereby improving energy utilization and extending the battery's service life.

[0019] In some embodiments, after obtaining the target allowable feedback power, the method further includes: if it is determined that the voltage prediction value corresponding to the next prediction time window is greater than the overvoltage threshold, then the target allowable feedback power is reduced in the next prediction time window, and the reduced allowable feedback power is used to limit the battery's recharge power; until the voltage prediction value of a certain prediction time window is not greater than the overvoltage threshold, or the reduced allowable feedback power is a preset power base value, the battery's recharge power is limited according to the last reduced allowable feedback power or the preset power base value.

[0020] In this embodiment of the application, if the predicted voltage values ​​corresponding to multiple prediction time windows are all greater than the overvoltage threshold, it indicates that overvoltage is likely to occur. Therefore, it is necessary to further reduce the allowable feedback power based on the reduced power to further reduce the probability of overvoltage, improve energy utilization, and extend the battery life.

[0021] In some embodiments, the method further includes: if it is determined that the voltage prediction values ​​of multiple consecutive prediction time windows are not greater than the overvoltage threshold, then the reduced allowable feedback power is restored to the standard allowable feedback power, and the standard allowable feedback power is used to limit the recharge power of the battery.

[0022] In this embodiment, if the predicted voltage values ​​for multiple consecutive prediction time windows are not greater than the overvoltage threshold, it indicates that the battery voltage is stable and there is no risk of sudden overvoltage. In this case, the reduced allowable feedback power is restored to the standard allowable feedback power. During this process, the energy utilization rate is improved and the battery life is extended through the recovery mechanism.

[0023] Secondly, embodiments of this application provide a battery recharge device, which includes: an acquisition module for acquiring current battery parameters of a battery in a vehicle; a prediction module for predicting the voltage value of the battery at a future time based on the current battery parameters and according to a prediction time window, to obtain a voltage prediction value; and a reduction module for reducing the standard allowable feedback power using a feedback power reduction strategy if the voltage prediction value is determined to be greater than an overvoltage threshold, to obtain a target allowable feedback power; wherein the target allowable feedback power is used to limit the battery's recharge power.

[0024] Thirdly, embodiments of this application provide an in-vehicle electronic control unit, including: a processor and a memory, the memory storing machine-readable instructions executable by the processor, the machine-readable instructions being able to perform the method steps of any embodiment of the first aspect when executed by the processor.

[0025] Fourthly, embodiments of this application provide a vehicle, the vehicle including a battery management system, the battery management system being used to perform the method steps of any embodiment of the first aspect.

[0026] Fifthly, embodiments of this application provide a computer program product, including: computer program instructions, which are executed by a processor to perform the method steps of any embodiment of the first aspect.

[0027] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application 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.

[0029] Figure 1 A schematic flowchart illustrating a battery recharge method provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery recharge device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the vehicle electronic control unit provided in the embodiment of this application. Detailed Implementation

[0030] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0031] It should be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0033] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0034] Regenerative braking technology is a core component of the energy management system for electric and hybrid vehicles. This technology utilizes the reversibility of the electric motor to convert kinetic energy into electrical energy stored in the battery during vehicle deceleration or braking. Specifically, when the driver releases the accelerator pedal and enters a coasting state, the vehicle controller switches the motor to generator mode, adjusting the recovery intensity according to the set feedback level.

[0035] Electric vehicle battery regenerative braking technology can convert the vehicle's kinetic energy into electrical energy and feed it back to the battery, offering the following advantages: significantly improved range, enhanced energy utilization efficiency, and reduced mechanical brake wear.

[0036] However, the real-time status of the battery (such as remaining battery charge and temperature) and the vehicle's operating conditions (vehicle speed and acceleration) jointly affect the upper limit of the regenerative power. Excessive regenerative power can easily cause battery overvoltage, leading to power interruption. Furthermore, as the vehicle's usage time increases, the battery's DC internal resistance will also increase. Controlling the regenerative power solely through the factory-set regenerative power meter will result in a mismatch between the regenerative power and the actual battery status, leading to excessively high or low regenerative power, causing overvoltage problems or insufficient energy recovery.

[0037] Therefore, to address the aforementioned problems, this application provides a battery recharge method that uses the current battery status of the vehicle to predict the voltage forecast value for a future period of time, and determines whether it is necessary to reduce the allowable feedback power in advance based on the voltage forecast value to limit the battery recharge power, thereby reducing the probability of overvoltage, improving energy utilization, and extending the battery's service life.

[0038] Figure 1This is a flowchart illustrating a battery recharge method provided in an embodiment of this application. It is understood that the battery recharge method provided in this application can be applied to an on-board electronic control unit or a battery management system in a vehicle. To facilitate understanding of the technical solution provided in this application, the application scenarios of the battery recharge method provided in this application are described below, using a battery management system as the executing entity. Figure 1 As shown, the method includes: Step S101: Obtain the current battery parameters of the battery on the vehicle.

[0039] Battery parameters are used to describe the battery's real-time status, performance, and health.

[0040] Battery parameters include remaining charge (State of Charge, SOC), battery temperature, and battery voltage. In addition, battery parameters may also include battery current, rated capacity, state of health, power density, self-discharge rate, and battery type.

[0041] In the specific implementation process, the current battery parameters of the vehicle's battery are collected by relevant sensors and uploaded to the battery management system so that the battery management system can obtain the current battery parameters of the vehicle's battery.

[0042] Step S102: Based on the current battery parameters, predict the voltage value of the battery at a certain time in the future according to the prediction time window, and obtain the voltage prediction value.

[0043] The prediction time window length is preset based on the actual situation of the battery type. For example, if a certain type of battery is prone to overvoltage, the prediction time window value can be set to a smaller value, such as 1 second. If the battery is not prone to overvoltage, the prediction time window value can be set to a larger value, such as 3 seconds.

[0044] It should be noted that the length of the prediction time window can also be determined based on the vehicle's driving conditions and battery type.

[0045] Specifically, if a vehicle frequently travels on areas with many downhill sections, it needs to keep the brake pedal pressed for extended periods, which in turn causes the battery to receive feedback for a longer time. This can easily lead to battery overvoltage. Therefore, the prediction time window is set to a smaller value to predict the battery voltage in real time and reduce the risk of overvoltage.

[0046] A future moment is the instantaneous point in time that extends along the timeline in a positive direction from the current moment to the end of the prediction time window. It can be calculated by adding the duration of the prediction time window to the current moment.

[0047] For example, if the prediction time window is 1 second long, and the current time is 14:23:50 Beijing time, then a future time refers to the time 1 second from the current time, i.e., 14:23:51. The battery management system predicts the voltage value at 14:23:51 based on the battery parameters obtained at 14:23:50, thus obtaining the predicted voltage value.

[0048] In one implementation, a first battery voltage prediction model is pre-trained based on historical battery parameters, and the acquired current battery parameters are input into the first battery voltage prediction model to obtain the voltage prediction value.

[0049] The first battery voltage prediction model maps current battery parameters to predicted voltage values ​​at a future point in time. The initial model for the first battery voltage prediction model can be a gradient boosting model (such as XGBoost or LightGBM) or a recurrent neural network (such as RNN or LSTM). After determining the initial model, it is trained using historical battery parameters based on its characteristics to obtain the first battery voltage prediction model.

[0050] Step S103: If the predicted voltage value is determined to be greater than the overvoltage threshold, the standard allowable feedback power is reduced using the feedback power reduction strategy to obtain the target allowable feedback power; wherein, the target allowable feedback power is used to limit the recharge power of the battery.

[0051] The regenerative power reduction strategy is a dynamic control method in electric vehicle energy recovery systems. It refers to a technical approach where, when the predicted battery voltage exceeds a safety threshold, the battery management system (BMS) reduces the regenerative power (rather than directly cutting it off) according to a preset algorithm, thus balancing energy recovery efficiency and battery safety.

[0052] The overvoltage threshold is a predetermined value based on the battery type.

[0053] To reduce the probability of overvoltage, the overvoltage threshold must be lower than the maximum safe voltage that the battery can reach, i.e., the overvoltage safety threshold.

[0054] For example, if the overvoltage safety threshold of the battery is 4.4V, then the overvoltage voltage threshold is 4.15V.

[0055] The standard allowable regenerative power refers to the value in the original regenerative power table generated in advance based on battery pack test data. Different battery parameters correspond to different standard allowable regenerative powers.

[0056] Therefore, in the specific implementation process, the original allowable recharge power table (MAP) is first queried based on the current battery parameters to obtain the standard allowable recharge power corresponding to the current battery parameters. Then, the standard allowable recharge power is reduced using a recharge power reduction strategy to obtain the target allowable recharge power, and the recharge power of the battery is limited by the target allowable recharge power.

[0057] In one implementation, the target allowable feedback power is obtained by multiplying the standard allowable feedback power by a scaling factor. For example, if the scaling factor is 0.8, then the target allowable feedback power = standard allowable feedback power × 0.8.

[0058] It should be noted that the scaling factor can be set adaptively according to the actual situation. For example, the scaling factor can also be set to 0.85 or 0.7.

[0059] In this embodiment, the voltage prediction value for a future period is predicted by using the current battery parameters of the vehicle battery to know the battery voltage situation for a future period. When the voltage prediction value is greater than the overvoltage threshold, the standard allowable feedback power is reduced by using a feedback power reduction strategy. By reducing the allowable feedback power in advance, the recharge power of the battery can be limited. Even in the case of rapid deceleration, the probability of overvoltage can be reduced, energy utilization can be improved, and the battery life can be extended.

[0060] In some embodiments, the current battery parameters include the current remaining charge value, the current battery temperature value, and the current battery voltage value. Based on the current battery parameters, the voltage value of the battery at a future time is predicted according to a prediction time window to obtain a voltage prediction value, including: determining the aging voltage value of the battery using the current remaining charge value and the current battery temperature value; obtaining the battery voltage starting value in the previous historical time window; determining the voltage change value of the battery at a future time based on the battery voltage starting value and the current battery voltage value; and determining the voltage prediction value based on the current battery voltage value, the aging voltage value, and the voltage change value.

[0061] The aging voltage value refers to the phenomenon where the actual operating voltage of a battery deviates from its initial state of health (SOH=100%) due to internal aging (such as electrode material degradation, SEI film thickening, electrolyte decomposition, etc.) during the charging and discharging process. The aging voltage value reflects the impact of battery performance degradation on voltage response and is one of the important parameters for assessing battery state of health (SOH) and lifespan.

[0062] In some embodiments, determining the battery aging voltage value using the current remaining charge value and the current battery temperature value includes: determining the battery's allowable recharge current and current battery resistance using the current remaining charge value and the current battery temperature value; and determining the battery aging voltage value based on the allowable recharge current and the current battery resistance.

[0063] Specifically, based on the current remaining charge value and the current battery temperature value, the pre-generated allowable recharge current table and cell ohm impedance table are consulted to obtain the battery's allowable recharge current and current battery resistance. Then, based on the formula... Determine the aging voltage value of the battery, where, This indicates the battery's aging voltage value. This indicates that recharge current is allowed. This indicates the current battery resistance.

[0064] In one optional embodiment, an aging voltage value generation model can be pre-trained based on historical battery charge values ​​and historical battery temperature values. Then, the current remaining battery charge value and the current battery temperature value are input into the aging voltage value generation model to obtain the battery's aging voltage value.

[0065] The previous historical time window refers to a time window formed by extending backward along the time axis from the current moment by the length of a predicted time window.

[0066] Therefore, the initial battery voltage value is the initial voltage value corresponding to the start of the previous historical time window.

[0067] In the specific implementation process, the starting value of the battery voltage in the previous historical time window is collected through the corresponding sensors.

[0068] Based on the initial and current battery voltage values, determine the voltage change at a future point in time. This includes: determining the actual voltage change in the previous historical time window based on the difference between the initial and current battery voltage values; and then, using the formula... The voltage change of the battery at a future moment is calculated, where, This represents the change in battery voltage at a future point in time. Indicates the length of the prediction time window. This indicates the actual voltage change of the battery during the previous historical time window.

[0069] After determining the battery's aging voltage and voltage change value, the predicted voltage value is determined based on the current battery voltage, aging voltage, and voltage change value.

[0070] In one implementation, through a formula Determine the predicted voltage value; where, This represents the predicted voltage value. This indicates the current battery voltage value. Indicates the aging voltage value. It represents the change in battery voltage at a future point in time.

[0071] In one optional implementation, a second battery voltage prediction model is pre-trained based on historical aging voltage values, historical voltage change values, and historical battery voltage values. The current battery voltage value, aging voltage value, and voltage change value are then input into the second battery voltage prediction model to obtain the voltage prediction value.

[0072] In this embodiment, considering battery aging, the aging voltage value is determined by the current remaining charge and current battery temperature, reflecting the impact of battery aging on the predicted voltage value. The voltage change value at a future point in time is determined based on the initial battery voltage value from the previous historical time window, reflecting the impact of historical battery voltage values ​​on the predicted voltage value. The current battery voltage value reflects the current condition of the battery. Therefore, determining the predicted voltage value using the aging voltage value, voltage change value, and current voltage value improves the accuracy of the predicted voltage value.

[0073] In some embodiments, if the predicted voltage value is determined to be greater than the overvoltage threshold, the standard allowable feedback power is reduced using a feedback power reduction strategy to obtain a target allowable feedback power, including: if the predicted voltage value is determined to be greater than the overvoltage threshold, a target reduction rate is determined based on the difference between the predicted voltage value and the overvoltage threshold; the standard allowable feedback power is reduced according to the target reduction rate to obtain the target allowable feedback power.

[0074] In the specific implementation process, if the difference between the predicted voltage value and the overvoltage threshold is large, the target reduction rate is large, so that the allowable feedback power can decrease rapidly and reduce the probability of overvoltage. If the difference between the predicted voltage value and the overvoltage threshold is small, the target reduction rate is small to achieve a smooth transition.

[0075] For example, the difference between the predicted voltage value and the overvoltage threshold is linearly related to the target rate of reduction as follows: ,in, Indicates the target's rate of descent. This indicates an adjustable gain coefficient, which can be set adaptively according to actual conditions. This represents the difference between the predicted voltage value and the overvoltage threshold.

[0076] In this embodiment, the allowable feedback power reduction rate is dynamically adjusted by the difference between the voltage prediction value and the overvoltage threshold, so that the allowable feedback power reduction process is smooth, improving energy utilization and extending battery life.

[0077] In some embodiments, after obtaining the target allowable feedback power, the method further includes: obtaining the current actual voltage and current actual current of the battery; if it is determined that the current actual voltage is greater than a first preset voltage threshold, then calculating the actual feedback power of the battery based on the current actual voltage and current actual current; wherein the overvoltage threshold is less than the first preset voltage threshold; if it is determined that the difference between the target allowable feedback power and the actual feedback power is greater than a preset power threshold, then reducing the target allowable feedback power to the actual feedback power within a preset time, and using the actual feedback power to limit the recharge power of the battery.

[0078] The first preset voltage threshold is a value set in advance according to the battery type. For example, the first preset voltage threshold can be 4.3V. Since the overvoltage safety threshold is the highest safe voltage that the battery is allowed to reach, the first preset voltage threshold is still lower than the overvoltage safety threshold to ensure normal battery operation.

[0079] The preset power threshold is a pre-set value, for example, the preset power threshold is 10KW, or 15KW, etc.

[0080] In the actual implementation process, the current actual voltage and current of the battery are collected in real time through corresponding sensors.

[0081] After obtaining the target required feedback power, if the current actual voltage of the battery is detected to be greater than the first preset voltage threshold, and the difference between the target allowable feedback power and the actual feedback power is large, it indicates that the probability of overvoltage is still high. At this time, the method of reducing the standard allowable feedback power at the target reduction rate can no longer solve the overvoltage problem in time. Therefore, it is necessary to quickly reduce the target allowable feedback power to the actual feedback power within a preset time.

[0082] The preset time is a pre-set value, such as reducing the target allowable feedback power to the actual feedback power within 500 milliseconds.

[0083] It should be noted that the preset time can also be set to 300 milliseconds, 600 milliseconds, etc.

[0084] In this embodiment, considering the overvoltage problem caused by an excessively long allowable feedback power decay time, after reducing the standard allowable feedback power, if the current actual battery voltage is greater than a first preset voltage threshold, and the target allowable feedback power still differs significantly from the actual feedback power, the target allowable feedback power is rapidly reduced to the actual feedback power within a preset time. In this process, by increasing the allowable feedback power decay rate, it is ensured that the allowable feedback power is reduced to a reasonable range in advance, further reducing the probability of overvoltage problems, improving energy utilization, and extending battery life.

[0085] In some embodiments, during the process of reducing the target allowable feedback power to the actual feedback power, the method further includes: if it is determined that the current actual voltage value of the battery is less than a second preset voltage threshold, then stop the process of reducing the target allowable feedback power and obtain an intermediate allowable feedback power, and use the intermediate allowable feedback power to limit the recharge power of the battery; wherein, the second preset voltage threshold is less than the first preset voltage threshold, and the overvoltage threshold is less than the second preset voltage threshold.

[0086] The second preset voltage threshold is a value pre-set according to the battery type, and the second preset voltage threshold is less than the first preset voltage threshold but greater than the overvoltage threshold. For example, the second preset voltage threshold can be 4.2V.

[0087] In the specific implementation process, since the actual voltage of the battery is detected in real time, if the current actual voltage value of the battery is detected to be less than the second preset voltage threshold during the process of reducing the target allowable feedback power to the actual feedback power, it indicates that the probability of the battery overvoltage is low. At this time, in order to effectively utilize the feedback energy and improve the energy utilization rate, the target allowable feedback power will no longer be reduced.

[0088] In this embodiment of the application, if the current actual voltage value of the battery is determined to be less than the second preset voltage threshold during the process of rapidly reducing the target allowable feedback power to the actual feedback power, the rapid reduction process is terminated, so that the final allowable feedback power is adapted to the current actual situation of the battery, thereby improving energy utilization and extending the battery's service life.

[0089] In some embodiments, the current actual voltage and current actual current of the battery are acquired in real time; if it is determined that the current actual voltage is greater than a first preset voltage threshold, the actual feedback power of the battery is calculated based on the current actual voltage and current actual current; if it is determined that the difference between the standard allowable feedback power and the actual feedback power is greater than a preset power threshold, the standard allowable feedback power is reduced to the actual feedback power within a preset time, and the recharge power of the battery is limited by the actual feedback power.

[0090] The standard allowable regenerative power refers to the value in the original regenerative power table generated in advance based on battery pack test data. Different battery parameters correspond to different standard allowable regenerative powers.

[0091] The process of "reducing the standard allowable feedback power to the actual feedback power within a preset time" is described above in the process of "reducing the target allowable feedback power to the actual feedback power within a preset time", and will not be repeated here.

[0092] In the process of limiting the recharge power of the battery using actual feedback power, if the predicted voltage value of the battery at a certain future moment is greater than the overvoltage threshold based on the current battery parameters and the predicted time window, then the feedback power reduction strategy is used to further reduce the standard allowable feedback power after the reduction, thereby accelerating the reduction rate.

[0093] The process of "further reducing the standard allowable feedback power using the feedback power reduction strategy" is described above in the section on "reducing the standard allowable feedback power using the feedback power reduction strategy to obtain the target allowable feedback power," and will not be repeated here. The overvoltage threshold is less than the first preset voltage threshold.

[0094] Furthermore, in the process of limiting the recharge power of the battery using actual feedback power, if it is determined that the current actual voltage value of the battery is less than the second preset voltage threshold, the process of reducing the standard allowable feedback power is stopped, and an intermediate allowable feedback power is obtained. The recharge power of the battery is then limited using the intermediate allowable feedback power. The second preset voltage threshold is less than the first preset voltage threshold, and the overvoltage threshold is less than the second preset voltage threshold.

[0095] In some embodiments, after obtaining the target allowable feedback power, the method further includes: if it is determined that the voltage prediction value corresponding to the next prediction time window is greater than the overvoltage threshold, then the target allowable feedback power is reduced in the next prediction time window, and the reduced allowable feedback power is used to limit the battery's recharge power; until the voltage prediction value of a certain prediction time window is not greater than the overvoltage threshold, or the reduced allowable feedback power is a preset power base value, the battery's recharge power is limited according to the last reduced allowable feedback power or the preset power base value.

[0096] In the specific implementation process, since the prediction process is continuously executed in a loop, if it is determined that the predicted voltage value corresponding to the next prediction time window is greater than the overvoltage threshold, the power reduction process is executed again based on the target allowable feedback power until the termination condition of the loop is reached.

[0097] Specifically, if it is determined that the voltage prediction value corresponding to the next prediction time window is greater than the overvoltage threshold, the target reduction rate is re-determined based on the difference between the voltage prediction value and the overvoltage threshold of the next prediction time window (see the above embodiment for the specific determination method), and the target allowable feedback power of the current prediction time window is reduced according to the re-determined target reduction rate based on the target allowable feedback power obtained in the current prediction time window.

[0098] The termination conditions include that the predicted voltage value in a certain prediction time window is not greater than the overvoltage threshold, or that the reduced allowable feedback power is the preset power base value.

[0099] The preset power base value is a pre-set value, for example, the preset power base value is 0KW or 5KW, etc.

[0100] In this embodiment of the application, if the predicted voltage values ​​corresponding to multiple prediction time windows are all greater than the overvoltage threshold, it indicates that overvoltage is likely to occur. Therefore, it is necessary to further reduce the allowable feedback power based on the reduced power to further reduce the probability of overvoltage, improve energy utilization, and extend the battery life.

[0101] In some embodiments, the method further includes: if it is determined that the voltage prediction values ​​of multiple consecutive prediction time windows are not greater than the overvoltage threshold, then the reduced allowable feedback power is restored to the standard allowable feedback power, and the standard allowable feedback power is used to limit the recharge power of the battery.

[0102] In practice, if the predicted voltage values ​​for multiple consecutive prediction time windows are not greater than the overvoltage threshold, it indicates that the battery voltage is stable and there is no risk of sudden overvoltage. In this case, the reduced allowable regenerative power is restored to the standard allowable regenerative power. This restoration mechanism improves energy utilization and extends battery life.

[0103] Figure 2 This is a schematic diagram of the structure of a battery recharge device provided in an embodiment of this application, as shown below. Figure 2 As shown, the device includes: an acquisition module 201, a prediction module 202, and a reduction module 203.

[0104] The acquisition module 201 is used to acquire the current battery parameters of the battery on the vehicle; the prediction module 202 is used to predict the voltage value of the battery at a certain time in the future based on the current battery parameters and according to the prediction time window, and obtain the voltage prediction value; the reduction module 203 is used to reduce the standard allowable feedback power by using a feedback power reduction strategy if it is determined that the voltage prediction value is greater than the overvoltage threshold, and obtain the target allowable feedback power; wherein, the target allowable feedback power is used to limit the recharge power of the battery.

[0105] Based on the above embodiments, the current battery parameters include the current remaining power value, the current battery temperature value, and the current battery voltage value; the prediction module 202 is specifically used to: determine the aging voltage value of the battery using the current remaining power value and the current battery temperature value; obtain the battery voltage starting value in the previous historical time window; determine the voltage change value of the battery at a certain time in the future based on the battery voltage starting value and the current battery voltage value; and determine the voltage prediction value based on the current battery voltage value, the aging voltage value, and the voltage change value.

[0106] Based on the above embodiments, the prediction module 202 is specifically used to: determine the allowable recharge current and current battery resistance of the battery using the current remaining charge value and the current battery temperature value; and determine the aging voltage value of the battery based on the allowable recharge current and the current battery resistance.

[0107] Based on the above embodiments, the prediction module 202 is specifically used to: predict using formulas Determine the predicted voltage value; where, This represents the predicted voltage value. This indicates the current battery voltage value. Indicates the aging voltage value. It represents the change in battery voltage at a future point in time.

[0108] Based on the above embodiments, the reduction module 203 is specifically used to: if the predicted voltage value is determined to be greater than the overvoltage threshold, determine the target reduction rate based on the difference between the predicted voltage value and the overvoltage threshold; reduce the standard allowable feedback power according to the target reduction rate to obtain the target allowable feedback power.

[0109] Based on the above embodiments, the reduction module 203 is specifically used to: obtain the current actual voltage and current actual current of the battery; if it is determined that the current actual voltage is greater than a first preset voltage threshold, calculate the actual feedback power of the battery based on the current actual voltage and current actual current; wherein, the overvoltage threshold is less than the first preset voltage threshold; if it is determined that the difference between the target allowable feedback power and the actual feedback power is greater than a preset power threshold, reduce the target allowable feedback power to the actual feedback power within a preset time, and use the actual feedback power to limit the recharge power of the battery.

[0110] Based on the above embodiments, the reduction module 203 is specifically used to: if it is determined that the current actual voltage value of the battery is less than the second preset voltage threshold, stop the reduction process of the target allowable feedback power and obtain the intermediate allowable feedback power, and use the intermediate allowable feedback power to limit the recharge power of the battery; wherein, the second preset voltage threshold is less than the first preset voltage threshold, and the overvoltage threshold is less than the second preset voltage threshold.

[0111] Based on the above embodiments, the reduction module 203 is specifically used to: if it is determined that the voltage prediction value corresponding to the next prediction time window is greater than the overvoltage threshold, then the target allowable feedback power is reduced in the next prediction time window, and the battery recharge power is limited by the reduced allowable feedback power; until the voltage prediction value of a certain prediction time window is not greater than the overvoltage threshold, or the reduced allowable feedback power is a preset power base value, the battery recharge power is limited by the last reduced allowable feedback power or the preset power base value.

[0112] Based on the above embodiments, the device further includes a recovery module, which is used to restore the reduced allowable feedback power to the standard allowable feedback power if it is determined that the voltage prediction values ​​of multiple consecutive prediction time windows are not greater than the overvoltage threshold, and to limit the recharge power of the battery using the standard allowable feedback power.

[0113] It should be understood that this device corresponds to the battery recharge method embodiment described above and is capable of performing the various steps involved in the above method embodiment. The specific functions of this device can be found in the description above, and detailed descriptions are omitted here to avoid repetition. The device includes at least one software functional module that can be stored in memory or embedded in the device's operating system (OS) in the form of software or firmware.

[0114] Figure 3 This is a schematic diagram of the structure of the vehicle electronic control unit provided in the embodiments of this application, as shown below. Figure 3 As shown, the vehicle-mounted electronic control unit includes a processor 301, a memory 302, and a bus 303; wherein the processor 301 and the memory 302 communicate with each other through the bus 303. The processor 301 is used to call program instructions in the memory 302 to execute the methods provided in the above-described method embodiments.

[0115] Processor 301 can be an integrated circuit chip with signal processing capabilities. The processor 301 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor.

[0116] The memory 302 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0117] This application provides a computer program product, including: computer program instructions, which are executed by a processor to perform the methods provided in the above-described method embodiments.

[0118] This application provides a computer-readable storage medium, including: computer program instructions stored on the computer-readable storage medium, which, when executed by a processor, perform the methods provided in the above-described method embodiments.

[0119] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0120] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0121] Furthermore, 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.

[0122] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0123] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method of battery recharging, characterized in that, The method comprises: acquiring a current battery parameter of a battery on a vehicle; predicting a voltage value of the battery at a future time according to the current battery parameter and within a prediction time window, to obtain a voltage prediction value; if it is determined that the voltage prediction value is greater than an overvoltage threshold value, reducing a standard allowable feedback power by using a feedback power reduction strategy to obtain a target allowable feedback power; wherein the target allowable feedback power is used to limit a recharge power of the battery.

2. The method of claim 1, wherein, wherein, the current battery parameter comprises a current remaining capacity value, a current battery temperature value and a current battery voltage value; the prediction of the voltage value of the battery at the future time according to the current battery parameter and within the prediction time window comprises: determining an aging voltage value of the battery by using the current remaining capacity value and the current battery temperature value; acquiring a battery voltage starting value of the battery within a previous historical time window; determining a voltage change value of the battery at the future time according to the battery voltage starting value and the current battery voltage value; determining the voltage prediction value according to the current battery voltage value, the aging voltage value and the voltage change value.

3. The method of claim 2, wherein, the determination of the aging voltage value of the battery by using the current remaining capacity value and the current battery temperature value comprises: determining an allowable recharge current and a current battery resistance of the battery by using the current remaining capacity value and the current battery temperature value; determining the aging voltage value of the battery based on the allowable recharge current and the current battery resistance.

4. The method of claim 2, wherein, the determination of the voltage prediction value according to the current battery voltage value, the aging voltage value and the voltage change value comprises: determining the voltage prediction value by the formula determining the voltage prediction value; wherein, denotes the voltage prediction value, denotes the current battery voltage value, denotes the aging voltage value, denotes the voltage change value of the battery at a future time.

5. The method of claim 1, wherein, if it is determined that the voltage prediction value is greater than the overvoltage threshold value, reducing the standard allowable feedback power by using the feedback power reduction strategy to obtain the target allowable feedback power, comprises: if it is determined that the voltage prediction value is greater than the overvoltage threshold value, determining a target reduction rate according to a difference between the voltage prediction value and the overvoltage threshold value; reducing the standard allowable feedback power at the target reduction rate to obtain the target allowable feedback power.

6. The method according to any one of claims 1 to 5, characterized in that, after obtaining the target allowable feedback power, the method further comprises: acquiring a current actual voltage and a current actual current of the battery; if it is determined that the current actual voltage is greater than a first preset voltage threshold value, calculating an actual feedback power of the battery according to the current actual voltage and the current actual current; wherein the overvoltage threshold value is less than the first preset voltage threshold value; if it is determined that a difference between the target allowable feedback power and the actual feedback power is greater than a preset power threshold value, reducing the target allowable feedback power to the actual feedback power within a preset time, and limiting the recharge power of the battery by using the actual feedback power.

7. The method of claim 6, wherein, in the process of reducing the target allowable feedback power to the actual feedback power, the method further comprises: If it is determined that the current actual voltage value of the battery is less than a second preset voltage threshold, a reduction process of the target allowable feedback power is stopped, and an intermediate allowable feedback power is obtained, and the intermediate allowable feedback power is used to limit the recharge power of the battery; wherein the second preset voltage threshold is less than the first preset voltage threshold, and the overvoltage threshold is less than the second preset voltage threshold.

8. The method according to any one of claims 1 to 5, characterized in that, After the target allowable feedback power is obtained, the method further comprises: If it is determined that the voltage prediction value corresponding to a next prediction time window is greater than the overvoltage threshold, the target allowable feedback power is reduced in the next prediction time window, and the reduced allowable feedback power is used to limit the recharge power of the battery; until the voltage prediction value of a certain prediction time window is not greater than the overvoltage threshold, or the reduced allowable feedback power is a preset power base value, the recharge power of the battery is limited by the last reduced allowable feedback power or the preset power base value.

9. The method of claim 8, wherein, The method further comprises: if it is determined that the voltage prediction values of a plurality of continuous prediction time windows are not greater than the overvoltage threshold, the reduced allowable feedback power is restored to the standard allowable feedback power, and the recharge power of the battery is limited by the standard allowable feedback power.

10. An in-vehicle electronic control unit, characterized by comprising: comprises: a processor and a memory, the memory storing machine readable instructions executable by the processor, the machine readable instructions, when executed by the processor, performing the method of any one of claims 1 to 9.

11. A vehicle characterized by comprising: The vehicle comprises a battery management system for performing the method of any one of claims 1 to 9.

12. A computer program product, characterised in that, comprises: computer program instructions, which, when executed by a processor, perform the method of any one of claims 1 to 9.

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