Power battery recharging power control method and device, vehicle and storage medium

Abstract

This disclosure relates to a method, apparatus, vehicle, and storage medium for controlling the recharge power of a power battery, belonging to the fields of electric vehicle energy management and battery power regulation technology. The method includes: obtaining a first recharge limit power of the power battery, the maximum single-cell voltage of the power battery, and the current actual recharge power of the power battery; in response to the first recharge limit power, the actual recharge power, and the maximum single-cell voltage satisfying a set first power adjustment condition, reducing the recharge limit power of the power battery from the first recharge limit power to a second recharge limit power, thereby reducing the rate of increase of the maximum single-cell voltage of the power battery. Thus, this solution can avoid the risk of battery overcharging. By adjusting the recharge limit power to reduce the rate of increase of the maximum single-cell voltage of the power battery, the recharge power limit of the battery can be explored without overvoltage, improving battery recharge performance.

Description

Technical Field

[0001] This disclosure relates to the fields of electric vehicle energy management and battery power regulation technology, and in particular to a method, device, vehicle, and storage medium for controlling the recharge power of a power battery. Background Technology

[0002] The vehicle's Battery Management System (BMS) needs to adjust the battery's recharge power accurately in real time during vehicle operation. By judging the battery's state and making certain adjustments and limits, the power released or received by the battery is within a reasonable and safe range, and the charging and discharging performance can be maximized.

[0003] Currently, common methods for limiting recharge power are based on a lookup table of battery temperature and State of Charge (SOC). During battery operation, the Battery Management System (BMS) estimates the SOC in real time and monitors the battery temperature to obtain the theoretical recharge limit power. Limiting recharge power in this way results in the recharge limit power being dependent on the SOC, failing to accurately reflect the battery's true performance. This can lead to significant deviations in the obtained recharge limit power, posing a safety hazard to battery use. Summary of the Invention

[0004] This disclosure provides a method, apparatus, vehicle, server, and computer-readable storage medium for controlling the recharge power of a power battery, to at least solve the problem of low accuracy in determining the recharge limit power in related technologies. The technical solution of this disclosure is as follows: According to a first aspect of the present disclosure, a method for controlling the recharge power of a power battery is provided, comprising: obtaining a first recharge limit power of the power battery, a maximum single-cell voltage of the power battery, and a current actual recharge power of the power battery; in response to the first recharge limit power, the actual recharge power, and the maximum single-cell voltage satisfying a set first power adjustment condition, reducing the recharge limit power of the power battery from the first recharge limit power to a second recharge limit power to reduce the rate of increase of the maximum single-cell voltage of the power battery; wherein the second recharge limit power is less than the first recharge limit power.

[0005] According to a second aspect of the present disclosure, a power battery recharge power control device is provided, comprising: an acquisition module configured to acquire a first recharge limit power of the power battery, a maximum single-cell voltage of the power battery, and a current actual recharge power of the power battery; and a control module configured to, in response to the first recharge limit power, the actual recharge power, and the maximum single-cell voltage satisfying a set first power adjustment condition, reduce the recharge limit power of the power battery from the first recharge limit power to a second recharge limit power to reduce the rate of increase of the maximum single-cell voltage of the power battery; wherein the second recharge limit power is less than the first recharge limit power.

[0006] According to a third aspect of the present disclosure, a vehicle is provided, including a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the steps of the method described in the first aspect of the present disclosure.

[0007] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement the steps of the method described in the first aspect of the present disclosure.

[0008] The technical solutions provided by the embodiments of this disclosure offer at least the following beneficial effects: By obtaining the first recharge limit power of the power battery, the maximum single-cell voltage of the power battery, and the current actual recharge power of the power battery, and when the first recharge limit power, the actual recharge power, and the maximum single-cell voltage meet the set first power adjustment conditions, the recharge limit power of the power battery is reduced, thereby reducing the rate of increase of the maximum single-cell voltage of the power battery, avoiding the risk of overcharging, protecting battery safety, and extending battery life. Adjusting the recharge limit power of the power battery using the first recharge limit power, the actual recharge power, and the maximum single-cell voltage allows for decoupling of the recharge limit power from the state of charge (SOC), improving the accuracy of adjusting the recharge limit power and its adaptability to different operating conditions. By reducing the rate of increase of the maximum single-cell voltage of the power battery through adjusting the recharge limit power, the recharge power limit of the battery can be explored without overvoltage, improving battery recharge performance.

[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0011] Figure 1 This is a flowchart illustrating a power battery recharge power control method according to an exemplary embodiment.

[0012] Figure 2 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment.

[0013] Figure 3 This is a schematic diagram illustrating the mapping relationship between recharge-limited power variation and voltage according to an exemplary embodiment.

[0014] Figure 4 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment.

[0015] Figure 5 This is a schematic diagram illustrating constant voltage control of the maximum single-cell voltage according to an exemplary embodiment.

[0016] Figure 6 This is a schematic diagram illustrating voltage protection operation of a power battery according to an exemplary embodiment.

[0017] Figure 7 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment.

[0018] Figure 8 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment.

[0019] Figure 9 This is a flowchart illustrating the recharge power control of a power battery according to an exemplary embodiment.

[0020] Figure 10 This is a block diagram illustrating a recharge power control device for a power battery according to an exemplary embodiment.

[0021] Figure 11 This is a block diagram illustrating a vehicle according to an exemplary embodiment. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0023] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure 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 disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0024] It should be noted that the discharge and recharge capabilities of a power battery are among the most important performance indicators. Underestimating the discharge or recharge capabilities of a power battery will prevent its full performance from being realized, while overestimating its capabilities may lead to safety risks such as overcurrent, overheating, or even undervoltage or overvoltage.

[0025] The recharge limit power of a power battery is the maximum allowable charging power value, ensuring that the battery is not damaged due to excessive power during charging. By limiting the recharge power of the power battery, the power discharged or received by the power battery is kept within a reasonable and safe range, and its charging and discharging performance is maximized.

[0026] Figure 1 This is a flowchart illustrating a power battery recharge power control method according to an exemplary embodiment, such as... Figure 1 As shown in the figure, the power battery recharge power control method of this disclosure includes the following steps.

[0027] S101, obtain the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery.

[0028] It should be noted that the execution subject of the power battery recharge power control method in this embodiment is an electronic device, such as an in-vehicle terminal, an in-vehicle controller, or an electronic device equipped with a vehicle control system. The power battery recharge power control method in this embodiment can be executed by the power battery recharge power control device, which can be configured in any electronic device to execute the power battery recharge power control method.

[0029] It should be noted that power batteries have different physical characteristics at different states of charge (SOC) and temperatures, which will affect the recharge power of the power battery. Therefore, it is necessary to limit the recharge power of the power battery at different SOC and temperatures, that is, to limit the recharge power of the power battery by limiting the recharge power.

[0030] In some embodiments, the performance parameter table of the power battery itself can be obtained, which includes the mapping relationship between different SOCs and temperatures and the recharge limit power.

[0031] In some embodiments, the performance parameter table can be consulted based on the current SOC and temperature of the power battery to determine the theoretical recharge limit power of the power battery at the current SOC and temperature, which is used as the first recharge limit power. The first recharge limit power is the theoretical, fundamental first recharge limit power of the power battery at the current SOC and temperature.

[0032] In some embodiments, SOC is used to describe the percentage of the battery's current remaining charge relative to its total capacity. The current SOC of the power battery can be determined by monitoring the current remaining available charge of the power battery and based on the power battery's rated charge.

[0033] In some embodiments, the current SOC can also be determined based on the open-circuit voltage of the power battery. By determining the linear relationship between the open-circuit voltage and the SOC, the monitored SOC can be determined based on the open-circuit voltage and the linear relationship of the power battery.

[0034] Optionally, the current SOC of the power battery can be determined using any of the methods for determining SOC in the relevant technologies, and this disclosure does not limit this method.

[0035] In some embodiments, the temperature of the power battery can be monitored in real time based on the temperature sensor of the power battery itself, thereby determining the current temperature of the power battery.

[0036] It should be noted that a power battery is composed of multiple cells connected in series, parallel, or a combination thereof. Each cell is a single battery unit, and the voltage of a single cell in a power battery is the voltage of that single cell.

[0037] In some embodiments, the voltage of each cell in the power battery is monitored in real time to determine the cell voltage, and the cell voltage with the largest voltage value among multiple cell voltages is determined as the maximum cell voltage of the power battery.

[0038] Optionally, the monitoring of the voltage of a single cell in the power battery can be achieved using any of the relevant technologies for monitoring the voltage of a single cell, and there is no limitation on this.

[0039] In some embodiments, during the monitoring of the voltage of a single cell in a power battery, multiple voltage values ​​of any single cell can be collected within a set time period, and the average value of the multiple voltage values ​​can be filtered to obtain the single cell voltage, thereby improving the accuracy of monitoring the single cell voltage.

[0040] In some embodiments, the recharge power of a power battery refers to the actual electrical power received and stored by the power battery. The power battery can be monitored in real time to determine the current actual recharge power. For example, the input terminal of the power battery can be monitored to determine the electrical power input to the power battery, which can then be used as the current actual recharge power of the power battery.

[0041] In some embodiments, the vehicle's Battery Management System (BMS) monitors parameters such as voltage, current, temperature, and SOC of the power battery in real time and calculates the current actual recharge power using algorithms.

[0042] In other words, the current actual recharge power of the power battery can be obtained from the BMS.

[0043] S102, in response to the first recharge limit power, actual recharge power and maximum single cell voltage meeting the set first power adjustment condition, the recharge limit power of the power battery is reduced from the first recharge limit power to the second recharge limit power, so as to reduce the rate of increase of the maximum single cell voltage of the power battery.

[0044] In some embodiments, the first power adjustment condition refers to adjusting the recharge limit power of the power battery when the difference between the first recharge limit power and the actual recharge power is too large, thereby reducing the recharge limit power of the power battery, and using the reduced recharge limit power to limit the recharge power of the power battery. In other words, the second recharge limit power is less than the first recharge limit power.

[0045] In some embodiments, limiting the recharge power of the power battery using a reduced second recharge limit power can reduce the charging current of the power battery. Since the voltage rise rate is related to the charging current, reducing the charging current can reduce the voltage rise rate.

[0046] In other words, by limiting the recharge power of the power battery, the rapid rise in the voltage of individual power battery cells can be slowed down, thereby avoiding the risk of overcharging, protecting battery safety, and extending battery life.

[0047] In some embodiments, the first power adjustment condition may be that the difference between the first recharge limit power and the actual recharge power is greater than the power difference threshold, and the maximum single cell voltage is greater than the first set voltage. If the power battery meets the first power adjustment condition, it can be considered that the difference between the first recharge limit power and the actual recharge power is too large.

[0048] In some embodiments, reducing the recharge limit power of the power battery can be achieved by reducing the first recharge limit power by a set value to obtain a second recharge limit power, and then reducing the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power.

[0049] In some embodiments, reducing the recharge limit power of the power battery can also be achieved by determining a second recharge limit power based on the actual recharge power and reducing the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power.

[0050] In some embodiments, the recharge limit power determined based on the actual recharge power can be used as the second recharge limit power, thereby reducing the recharge limit power of the power battery.

[0051] It should be noted that the purpose of reducing the recharge limit power of the power battery is to reduce the gap between the recharge limit power and the actual recharge power. In other words, a small amount of power can be added to the actual recharge power to obtain the second recharge limit power.

[0052] For example, suppose the first recharge limit power is 200kW and the actual recharge power is 100kW. If the difference between the first recharge limit power and the actual recharge power is greater than 30kW, it is considered that the difference is too large. Therefore, the actual recharge power can be increased by 5kW to obtain the second recharge limit power of 105kW. The difference between the second recharge limit power and the actual recharge power is less than 30kW. The second recharge limit power is used as the recharge limit power of the power battery.

[0053] It should be noted that the power battery recharge power control method of this disclosure embodiment can be applied to the vehicle's battery management system (BMS), such as... Figure 2 The diagram shows the system structure of the vehicle. The power battery recharge power control method of this disclosure embodiment can be deployed in the BMS, which can send the power battery recharge limit power to the vehicle's motion controller during vehicle charging, so that the maximum power used or supplied to the power battery cannot exceed the recharge limit power given by the BMS.

[0054] In some embodiments, a power control command can be generated based on the second recharge limit power and sent to the BMS, so that the BMS obtains the second recharge limit power from the power control command and sends it to the vehicle's motion controller, so that the power of the power battery during charging does not exceed the second recharge limit power.

[0055] The recharge power control method for a power battery provided in this disclosure obtains the basic first recharge limit power, the maximum single-cell voltage of the power battery, and the current actual recharge power of the power battery. When the first recharge limit power, the actual recharge power, and the maximum single-cell voltage meet a set first power adjustment condition, the recharge limit power of the power battery is reduced. This reduces the rate of increase of the maximum single-cell voltage of the power battery, avoids the risk of overcharging, protects battery safety, and extends battery life. Adjusting the recharge limit power of the power battery using the first recharge limit power, the actual recharge power, and the maximum single-cell voltage allows for decoupling of the recharge limit power from the state of charge (SOC), improving the accuracy of the recharge limit power adjustment and its adaptability to different operating conditions. By adjusting the recharge limit power to reduce the rate of increase of the maximum single-cell voltage of the power battery, the recharge power limit of the battery can be explored without overvoltage, improving battery recharge performance.

[0056] It should be noted that the power change curve can be calculated by monitoring the current and voltage of the power battery, and the difference between the maximum single-cell voltage change and the power change can be used to confirm whether the battery power control method provided in this disclosure embodiment has been used.

[0057] It should be noted that by monitoring the maximum single-cell voltage and actual recharge power of the power battery, when it is detected that the maximum single-cell voltage of the power battery decreases as the actual recharge power decreases, it can be determined that the recharge power control method of the power battery provided in this embodiment of the present disclosure is used to control the recharge power limitation of the vehicle's power battery.

[0058] It should be noted that when the power battery uses the recharge power control method of the power battery proposed in this disclosure, it can be monitored that the change in the maximum single cell voltage of the power battery is the same as the change in the actual recharge power. In other words, the maximum single cell voltage can decrease as the actual recharge power decreases.

[0059] Figure 2 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment, such as... Figure 2 As shown in the figure, the power battery recharge power control method of this disclosure includes the following steps.

[0060] S201, obtain the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery.

[0061] The details of step S201 can be found in the above embodiments and will not be repeated here.

[0062] S202, obtain the first power difference between the first recharge limit power and the actual recharge power.

[0063] S203, in response to the first power difference being greater than the set power difference threshold and the maximum single-cell voltage being greater than or equal to the first set voltage, it is determined that the first power adjustment condition is met.

[0064] It should be noted that the purpose of this disclosure is to reduce the rate of increase of the maximum single cell voltage of the power battery by adjusting the recharge limit power of the power battery. This allows monitoring of the current actual recharge power of the power battery when the maximum single cell voltage is greater than or equal to the first set voltage, and obtaining the first power difference between the first recharge limit power and the actual recharge power.

[0065] Furthermore, the magnitude of the first power difference and the set power difference threshold are determined, and when the first power difference is greater than the set power difference threshold, it can be determined that the first power adjustment condition is met.

[0066] Optionally, the first power difference being greater than a set power difference threshold can be expressed as: (1) in, This indicates the power limit for the first charge. Indicates the actual recharge power. Indicates the power difference threshold. This represents the first power difference.

[0067] S204, the actual recharge power of the power battery is boosted to obtain the second recharge limit power of the power battery, wherein the power boost is less than the first power difference.

[0068] In some embodiments, the actual recharge power of the power battery can be increased by a set power increase margin to obtain a second recharge limit power for the power battery. Since the power increase margin is less than the first power difference, the second recharge limit power is also less than the first recharge limit power.

[0069] In some embodiments, the power increase range can be preset to provide a certain control margin for vehicle motion control and prevent alarms for overpower or overcurrent faults caused by the actual recharge power of the power battery exceeding the recharge limit power for a short period of time.

[0070] In other words, a value can be randomly selected from the set range of power increase as the power increase range, and the actual recharge power of the power battery can be increased according to the power increase range.

[0071] In some embodiments, a mapping relationship between the voltage difference between the maximum single-cell voltage and the first set voltage and the power increase can be preset. This is achieved by determining the first voltage difference between the maximum single-cell voltage and the first set voltage, and then determining the power increase based on this first voltage difference. Specifically, the mapping relationship can be such that the larger the first voltage difference, the smaller the power increase.

[0072] In other words, the larger the first voltage difference, the smaller the second recharge limit power.

[0073] Optionally, the formula for determining the second recharge limit power is as follows: (2) in, This indicates the power limit for the second charge. Indicates the actual recharge power. This indicates the magnitude of the power increase.

[0074] S205 reduces the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power.

[0075] In some embodiments, during the process of reducing the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power, the recharge limit power of the power battery can be gradually reduced from the first recharge limit power to the second recharge limit power, thereby avoiding the impact on battery performance caused by directly reducing the recharge limit power to the second recharge limit power.

[0076] In other words, during the process of reducing the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power, the first recharge limit power can be gradually adjusted to gradually reduce the first recharge limit power until the first recharge limit power is equal to the second recharge limit power.

[0077] In some embodiments, a first power adjustment amount can be determined, and a first recharge limit power can be reduced based on the first power adjustment amount. During the reduction process, the first power adjustment amount is continuously updated to continuously reduce the adjusted recharge limit power.

[0078] In some embodiments, during the process of reducing the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power, there is a mapping relationship between power and voltage, which can be represented by the ratio of the power difference to the voltage difference.

[0079] It should be noted that the maximum single-cell voltage of the power battery will gradually increase during the process of reducing the recharge limit power. In order to reduce the rate of increase of the maximum single-cell voltage of the power battery, a second set voltage greater than the first set voltage can be set so that the maximum single-cell voltage of the power battery reaches the second set voltage when the first recharge limit power is reduced to the second recharge limit power. Thus, the rate of increase of the maximum single-cell voltage of the power battery can be controlled by the second set voltage.

[0080] In some embodiments, a second power difference between a first power adjustment amount and a first recharge limit power can be obtained, and the ratio of the second power difference to the first power difference can be determined. In addition, a first voltage difference between a second set voltage and a first set voltage, and a second voltage difference between the maximum cell voltage and the first set voltage can be obtained. The ratio of the second voltage difference to the first voltage difference and the ratio of the second power difference to the first power difference can be regarded as the same, so that the rate of increase of the maximum cell voltage can be controlled during the process of reducing the recharge limit power.

[0081] Alternatively, the mapping relationship between power and voltage can be expressed as: (3) in, Indicates the first power adjustment amount. This indicates the power limit for the first charge. This indicates the power limit for the second charge. Indicates the maximum single-cell voltage. Indicates the first set voltage. This indicates the second set voltage.

[0082] The first power adjustment amount can be calculated according to formula (3). The formula for calculating the first power adjustment amount is as follows: (4) in, Indicates the first power adjustment amount. This indicates the power limit for the first charge. This indicates the power limit for the second charge. Indicates the maximum single-cell voltage. Indicates the first set voltage. This indicates the second set voltage.

[0083] In other words, by obtaining the second power difference between the first recharge limit power and the second recharge limit power, and by normalizing the maximum single-cell voltage according to the first set voltage and the second set voltage, the normalized maximum single-cell voltage is obtained. Furthermore, the first power adjustment amount is determined based on the normalized maximum single-cell voltage and the second power difference.

[0084] In some embodiments, after determining a first power adjustment amount based on the maximum single-cell voltage, the first recharge limit power, and the second recharge limit power, the first recharge limit power can be adjusted according to the first power adjustment amount.

[0085] Optionally, the first recharge limit power can be adjusted to a first power adjustment amount to reduce the first recharge limit power.

[0086] Furthermore, the maximum cell voltage is reacquired to update the first power adjustment amount. Using the above formula (4), a new first power adjustment amount can be determined based on the maximum cell voltage, and based on the updated first power adjustment amount, the current recharge limit power of the power battery can be further reduced until it is reduced to the second recharge limit power.

[0087] In this embodiment, during the process of reducing the first recharge limit power to the second recharge limit power, a first power adjustment amount is determined and updated in real time, so as to adjust the first recharge limit power using the real-time updated first power adjustment amount, thereby gradually reducing the first recharge limit power.

[0088] Figure 3 This is a schematic diagram illustrating the mapping relationship between recharge-limited power variation and voltage according to an exemplary embodiment. Figure 3 In the middle, when the maximum single-cell voltage reaches the first set voltage The operation to reduce the recharge limit power of the power battery is initiated, starting from the first recharge limit power. Reduced to the second recharge limit power Simultaneously, during the reduction process, the maximum single-cell voltage gradually increases until it decreases to the second recharge limit power. The maximum single-cell voltage also reached the second set voltage. .

[0089] The power battery recharge power control method provided in this disclosure determines a second recharge limit power by analyzing the actual recharge power and the initial recharge power, and then reduces the power battery's recharge limit power from a first recharge limit power to the second recharge limit power. During the reduction of the first recharge limit power, a first power adjustment amount is used to gradually reduce the first recharge limit power, achieving a gradual reduction. This avoids significant reductions in the recharge limit power that could cause instability in the internal current of the power battery, reducing the impact on the power battery and thus achieving battery protection and improving the stability of battery charging.

[0090] Figure 4 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment, such as... Figure 4As shown in the figure, the power battery recharge power control method of this disclosure includes the following steps.

[0091] S401 obtains the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery.

[0092] S402, in response to the first recharge limit power, actual recharge power and maximum single cell voltage meeting the set first power adjustment condition, reduces the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power, so as to reduce the rate of increase of the maximum single cell voltage of the power battery.

[0093] The details of steps S401-S402 can be found in the above embodiments and will not be repeated here.

[0094] S403 obtains the change in the maximum single-cell voltage.

[0095] S404 adjusts the reduction of the recharge limit power of the power battery according to the changing situation.

[0096] In some embodiments, after reducing the recharge limit power of the power battery, the individual cell voltage of the power battery is continuously monitored, and the maximum individual cell voltage at each monitoring time is determined, thereby determining the change of the maximum individual cell voltage at each monitoring time.

[0097] In some embodiments, multiple maximum cell voltages can be monitored and determined within a set time period, and the changes in the maximum cell voltage can be determined based on these multiple maximum cell voltages. The changes in the maximum cell voltage can include trends, magnitudes, etc.

[0098] In some embodiments, after obtaining the change in the maximum single-cell voltage, the reduction operation of the recharge limit power of the power battery can be adjusted according to the change in the maximum single-cell voltage, so that the reduction operation of the recharge limit power of the power battery can reduce the rate of increase of the maximum single-cell voltage of the power battery.

[0099] It is understandable that the recharge limit power of the power battery is reduced to control the maximum single cell voltage to stop rising after reaching the second set voltage. If the maximum single cell voltage is greater than the second set voltage, the reduction operation of the recharge limit power of the power battery can be adjusted to avoid the maximum single cell voltage from continuously rising during the process of reducing the recharge limit power of the power battery, thus achieving constant voltage control of the maximum single cell voltage.

[0100] In other words, in response to the maximum single cell voltage being greater than the second set voltage, the recharge limit power of the power battery is reduced with the maximum single cell voltage being controlled near the second set voltage as a constraint, wherein the first set voltage is less than the second set voltage.

[0101] In some embodiments, the reduction of the recharge limit power of the power battery can be adjusted by proportional-integral-derivative (PID) control. Optionally, a second voltage difference between the maximum single-cell voltage and the second set voltage can be determined, and the recharge limit power of the power battery can be reduced according to the second voltage difference to obtain a third recharge limit power of the power battery.

[0102] Optionally, the formula for determining the second voltage difference is: (5) in, This indicates the second voltage difference. Indicates the maximum single-cell voltage. This indicates the second set voltage.

[0103] In some embodiments, a second voltage difference between the maximum single-cell voltage and the second set voltage can be determined, and the integral of the second voltage difference with respect to time can be determined. Furthermore, proportional adjustment amount and integral adjustment amount are determined according to proportional coefficient and integral coefficient, respectively. Thus, the recharge limit power of the power battery can be reduced according to the proportional adjustment amount and integral adjustment amount to obtain a third recharge limit power, thereby reducing the recharge limit power of the power battery to the third recharge limit power.

[0104] In some embodiments, a second power adjustment amount can be determined based on the proportional adjustment amount and the integral adjustment amount, and the recharge limit power of the power battery can be reduced according to the second power adjustment amount to obtain a third recharge limit power of the power battery.

[0105] In some embodiments, the process of determining the third recharge limit power can be expressed as: (6) in, This indicates the power limit for the third charge cycle. This indicates the power limit for the second charge. This indicates the second voltage difference. Indicates the amount of proportional adjustment. This represents the integral adjustment amount, where, Represents the proportionality coefficient. Represents the integral coefficient. This indicates the second power adjustment amount.

[0106] In some embodiments, the reduction of the recharge limit power of the power battery by adjusting the PID control can be achieved using any PID control method in the related art, and there is no limitation thereto.

[0107] Figure 5 This is a schematic diagram illustrating constant voltage control of the maximum single-cell voltage according to an exemplary embodiment. Figure 5 In the middle, when the recharge limit power of the power battery is reduced to the second recharge limit power... The power limit after recharging can be determined using formulas (5) and (6) above. Third recharge limit power And control the recharge limit power of the power battery to continue to decrease to the third recharge limit power. During this process, the maximum single-cell voltage is at the second set voltage. The voltage fluctuates near the target level to achieve constant voltage control for maximum individual cell voltage.

[0108] In some embodiments, after reducing the recharge limit power of the power battery by controlling the maximum single cell voltage to be near a second set voltage, the maximum single cell voltage can be continuously monitored to determine whether voltage protection operation of the power battery is required, so as to ensure the stability and safety of the power battery operation and thereby improve the battery charging performance.

[0109] It should be noted that voltage protection operation for power batteries refers to continuing to reduce the recharge limit power of the power battery when the maximum single cell voltage of the power battery continues to rise and exceeds the protection voltage value, in order to prevent the continued recharge power from causing the maximum single cell voltage to exceed the overvoltage boundary and triggering an overvoltage alarm.

[0110] In some embodiments, by reducing the recharge limit power of the power battery with the maximum single-cell voltage controlled near a second set voltage as a constraint, the maximum single-cell voltage is obtained. In response to the maximum single-cell voltage being greater than a third set voltage, a voltage protection operation is performed on the power battery, where the second set voltage is less than the third set voltage. The third set voltage is a protection voltage value.

[0111] In some embodiments, voltage protection operation is performed on the power battery, that is, the recharge limit power of the power battery is further reduced. The third recharge limit power of the power battery is adjusted by a third power adjustment amount, and the fourth recharge limit power of the power battery is obtained based on the third power adjustment amount, so as to reduce the recharge limit power of the power battery from the third recharge limit power to the fourth recharge limit power.

[0112] In some embodiments, a third power adjustment amount can be determined based on the maximum cell voltage, a second set voltage, and a third set voltage. The third power adjustment amount can be determined based on the third voltage difference and the fourth voltage difference by determining a third voltage difference between the third set voltage and the maximum cell voltage, and by determining a fourth voltage difference between the third set voltage and the second set voltage.

[0113] Optionally, the third power adjustment amount can be determined based on the ratio of the third voltage difference to the fourth voltage difference.

[0114] In some embodiments, the formula for the fourth recharge limit power of the power battery is obtained by adjusting the third recharge limit power of the power battery, as shown below: (7) in, This indicates the power limit for the fourth charge cycle, and this indicates the power limit for the third charge cycle. Indicates the maximum single-cell voltage. This indicates the second set voltage. This indicates the third set voltage. Indicates the third voltage difference. This represents the fourth voltage difference. This indicates the third power adjustment amount.

[0115] Figure 6 This is a schematic diagram illustrating voltage protection operation of a power battery according to an exemplary embodiment. Figure 6 In the middle, when the recharge limit power of the power battery decreases to the third recharge limit power... Subsequently, the maximum single-cell voltage exceeds the third set voltage. The system initiates voltage protection operation on the power battery, thereby determining the fourth recharge limit power. And according to the power limit of the fourth recharge The recharge limit power of the power battery is reduced.

[0116] The power battery recharge power control method provided in the embodiments of this disclosure, after the first recharge limit power, actual recharge power and maximum single cell voltage meet the set first power adjustment conditions, reduces the power battery recharge limit power, and then adjusts the reduction operation of the power battery recharge limit power according to the change of the maximum single cell voltage, thereby continuously reducing the power battery recharge limit power to limit the rate of increase of the maximum single cell voltage, avoid battery overvoltage, thereby achieving battery protection, extending battery life, and making the charging performance of the power battery more stable.

[0117] Figure 7This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment, such as... Figure 7 As shown in the figure, the power battery recharge power control method of this disclosure includes the following steps.

[0118] S701 obtains the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery.

[0119] S702, obtain the first power difference between the first recharge limit power and the actual recharge power.

[0120] The details of steps S701-S702 can be found in the above embodiments and will not be repeated here.

[0121] S703, in response to the first power difference being less than or equal to the power difference threshold and the maximum single-cell voltage being greater than the second set voltage, determines that the second power adjustment condition is met.

[0122] In some embodiments, the second power adjustment condition refers to adjusting the recharge limit power of the power battery when the difference between the first recharge limit power and the actual recharge power is small, so as to reduce the recharge limit power of the power battery, and using the reduced recharge limit power to limit the recharge power of the power battery.

[0123] In some embodiments, a first power difference less than or equal to a power difference threshold can be considered as a small difference between the first recharge limit power and the actual recharge power. When the first power difference is less than or equal to the power difference threshold and the maximum single-cell voltage of the power battery is greater than the second set voltage, it can be determined that the second power adjustment condition is met, so as to reduce the recharge limit power of the power battery to achieve constant voltage control of the maximum single-cell voltage.

[0124] S704 reduces the recharge limit power of the power battery by constraining the maximum single-cell voltage to be controlled near the second set voltage.

[0125] In some embodiments, by using the constraint that the maximum single-cell voltage is controlled near a second set voltage, the recharge limit power of the power battery is reduced. This can prevent the maximum single-cell voltage from continuously rising during the process of reducing the recharge limit power of the power battery, thereby achieving constant voltage control of the maximum single-cell voltage.

[0126] In some embodiments, a second voltage difference between the maximum single-cell voltage and the second set voltage can be determined, and the recharge limit power of the power battery can be reduced based on the second voltage difference to obtain a third recharge limit power of the power battery.

[0127] Optionally, PID control can be used to determine the third recharge limit power of the power battery, thereby reducing the recharge limit power of the power battery to the third recharge limit power. This achieves the adjustment of the recharge limit power reduction operation of the power battery with the constraint that the maximum single cell voltage is controlled near the second set voltage.

[0128] In some embodiments, a second power adjustment amount can be determined based on a second voltage difference, and the recharge limit power of the power battery can be reduced based on the second power adjustment amount to obtain a third recharge limit power of the power battery. The second power adjustment amount can be determined using PID control.

[0129] In other words, the proportional adjustment amount and the integral adjustment amount can be determined as the second power adjustment amount.

[0130] In some embodiments, the proportional adjustment amount and integral adjustment amount corresponding to the second voltage difference can be determined by the proportional coefficient and integral coefficient, and the second power adjustment amount can be determined based on the proportional adjustment amount and integral adjustment amount.

[0131] In some embodiments, the process of determining a second voltage difference, determining a second power adjustment amount based on the second voltage difference, and using the second power adjustment amount to reduce the recharge limit power of the power battery to obtain a third recharge limit power of the power battery can be found in the above formulas (5) and (6), and will not be repeated here.

[0132] It should be noted that when the first recharge limit power, the actual recharge power, and the maximum cell voltage meet the set first power adjustment condition, and when the first recharge limit power, the actual recharge power, and the maximum cell voltage meet the set second power adjustment condition, the recharge limit power of the power battery needs to be reduced with the constraint that the maximum cell voltage is controlled near the second set voltage, so as to achieve constant voltage control of the maximum cell voltage.

[0133] It should be noted that if the first power difference is less than or equal to the power difference threshold, it means that the difference between the recharge limit power and the actual recharge power is small. However, if the first power difference is greater than the power difference threshold, the first recharge limit power needs to be reduced to the second recharge limit power to reduce the difference between the recharge limit power and the actual recharge power.

[0134] Understandably, when the first recharge limit power, actual recharge power, and maximum single-cell voltage meet the first power adjustment condition, it is necessary to reduce the gap between the recharge limit power and the actual recharge power based on the second recharge limit power. However, when the first recharge limit power, actual recharge power, and maximum single-cell voltage meet the second power adjustment condition, the gap between the recharge limit power and the actual recharge power is already small and does not need to be further reduced.

[0135] In other words, when the first recharge limit power, the actual recharge power, and the maximum single-cell voltage meet the second power adjustment conditions, it can be considered that the recharge limit power of the power battery has been reduced to the second recharge limit power.

[0136] The power battery recharge power control method provided in the embodiments of this disclosure reduces the power battery recharge power when the first recharge limit power, the actual recharge power, and the maximum single cell voltage meet the set second power adjustment conditions, with the maximum single cell voltage being controlled near the second set voltage as a constraint condition. This achieves constant voltage control of the maximum single cell voltage, thereby reducing the rate of increase of the maximum single cell voltage of the power battery, avoiding the risk of overcharging, and improving the battery recharge performance.

[0137] Figure 8 This is a flowchart illustrating a power battery recharge power control method according to another exemplary embodiment, such as... Figure 8 As shown in the figure, the power battery recharge power control method of this disclosure includes the following steps.

[0138] S801 obtains the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery.

[0139] S802, in response to the power difference being greater than the power difference threshold and the maximum single-cell voltage being greater than the second set voltage, determines that the second power adjustment condition is met.

[0140] S803 reduces the recharge limit power of the power battery by constraining the maximum single-cell voltage to be controlled near the second set voltage.

[0141] S804 obtains the maximum single-cell voltage after reducing the recharge limit power of the power battery.

[0142] S805 performs voltage protection operation on the power battery in response to the maximum single cell voltage exceeding the third set voltage.

[0143] The relevant content of steps S801-S805 can be found in the above embodiments, and will not be repeated here.

[0144] It should be noted that, Figure 8 The diagram shows that when the first recharge limit power, the actual recharge power, and the maximum cell voltage meet the set second power adjustment conditions, the maximum cell voltage is controlled near the second set voltage. After reducing the recharge limit power of the power battery, it can be determined whether to perform voltage protection operation on the power battery.

[0145] In other words, regardless of whether the first recharge limit power, the actual recharge power, and the maximum single-cell voltage meet the first power adjustment condition or the second power adjustment condition, it is necessary to reduce the recharge limit power of the power battery and then determine whether to perform voltage protection operation on the power battery based on the maximum single-cell voltage to prevent the recharge power from continuing to exist, which would cause the maximum single-cell voltage to exceed the overvoltage boundary and trigger an overvoltage alarm.

[0146] The power battery recharge power control method provided in the embodiments of this disclosure uses the constraint that the maximum single cell voltage is controlled near a second set voltage to reduce the recharge limit power of the power battery, obtain the current maximum single cell voltage, and perform voltage protection operation on the power battery when the maximum single cell voltage is greater than a third set voltage. This can avoid battery overvoltage, thereby achieving battery protection, extending the battery's service life, and making the charging performance of the power battery more stable.

[0147] Based on any of the above embodiments, if the actual recharge power of the power battery weakens to the point of disappearing, the power battery recharge power control method disclosed herein will also exit due to the decline in the maximum single cell voltage, and the power battery recharge limit power will return to the first recharge limit power.

[0148] It should be noted that the recharge power control method for power batteries disclosed herein can be applied to recharge conditions during prolonged downhill driving. If the vehicle is not constantly accelerating, the battery will always recharge for a relatively long time to maintain speed stability. The battery cannot maintain its recharge capacity for an extended period. Therefore, during prolonged downhill driving, the battery charge remains around 100%, resulting in weak recharge capacity. Because of the continuous recharge power, the voltage will gradually increase. By using the method disclosed herein, the recharge power can be gradually reduced, suppressing the voltage increase and preventing the continuous supply of recharge current to the battery after exceeding its capacity limits, thus avoiding overvoltage.

[0149] If the actual SOC of the power battery is close to 100%, but the BMS estimates an SOC of 90%, the traditional recharge power limit will consult the performance parameter table based on 90%, assuming that the power battery has a large recharge capacity at this point. However, in reality, the power battery has no recharge capacity, causing the battery voltage to rise rapidly and bringing a huge overvoltage safety risk.

[0150] The method disclosed herein can quickly identify voltage increases and rapidly reduce the recharge power limit, thereby ensuring that the current supplied to the battery does not cause the battery voltage to rise further and that the voltage can be stably controlled, thus preventing safety risks caused by battery overvoltage.

[0151] Figure 9This is a flowchart illustrating the recharge power control of a power battery according to an exemplary embodiment. It involves determining the first recharge limit power of the power battery and the maximum single-cell voltage of the power battery. Greater than the first set voltage At that time, determine the first recharge limit power. and actual recharge power Is the first power difference greater than the power difference threshold? If the value is greater than the first power adjustment condition, then the second recharge limit power of the power battery can be determined, and the recharge limit power of the power battery can be adjusted from the first recharge limit power. Reduced to the second recharge limit power .

[0152] Furthermore, determine the maximum single-cell voltage of the power battery. Is it greater than the second set voltage? And greater than the second set voltage At that time, based on the maximum single-cell voltage Second set voltage The second voltage difference is used to determine the third recharge limit power of the power battery, and the recharge limit power of the power battery is controlled to decrease to the third recharge limit power. In this process, the maximum single-cell voltage is controlled. Constant voltage control. Specifically, in the first recharge limiting power... and actual recharge power The first power difference is less than or equal to the power difference threshold. At the same time, the maximum single-cell voltage of the power battery is also determined. Is it greater than the second set voltage? And greater than the second set voltage Then, proceed with the subsequent steps.

[0153] Furthermore, the maximum single-cell voltage of the power battery is re-acquired. and at the maximum single-cell voltage Greater than the third set voltage At this time, voltage protection operation is performed on the power battery. This is achieved by determining the fourth recharge limit power of the power battery and controlling the recharge limit power of the power battery to decrease to the fourth recharge limit power.

[0154] The process of determining the second, third, and fourth charge limit power can be found in the above embodiments and will not be repeated here.

[0155] Figure 10 This is a block diagram illustrating a recharge power control device for a power battery according to an exemplary embodiment. (Refer to...) Figure 10The power battery recharge power control device 1000 of this disclosure includes: an acquisition module 1001 and a control module 1002.

[0156] The acquisition module 1001 is configured to acquire the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery. The control module 1002 is configured to, in response to the first recharge limit power, the actual recharge power and the maximum single-cell voltage satisfying a set first power adjustment condition, reduce the recharge limit power of the power battery from the first recharge limit power to a second recharge limit power, so as to reduce the rate of rise of the maximum single-cell voltage of the power battery; wherein the second recharge limit power is less than the first recharge limit power.

[0157] In one embodiment of this disclosure, the control module 1002 is further configured to: obtain a first power difference between the first recharge limit power and the actual recharge power; and determine that the first power adjustment condition is met in response to the first power difference being greater than a set power difference threshold and the maximum single-cell voltage being greater than or equal to a first set voltage.

[0158] In one embodiment of this disclosure, the control module 1002 is further configured to: increase the actual recharge power of the power battery to obtain a second recharge limit power of the power battery, wherein the magnitude of the power increase is less than the first power difference.

[0159] In one embodiment of this disclosure, the control module 1002 is further configured to: determine a first power adjustment amount based on the maximum single-cell voltage, the first recharge limit power, and the second recharge limit power; adjust the first recharge limit power based on the first power adjustment amount; reacquire the maximum single-cell voltage to update the first power adjustment amount; and continue to reduce the current recharge limit power of the power battery based on the updated first power adjustment amount until it is reduced to the second recharge limit power.

[0160] In one embodiment of this disclosure, the control module 1002 is further configured to: acquire a second power difference between the first recharge limit power and the second recharge limit power; normalize the maximum single-cell voltage according to the first set voltage and the second set voltage to obtain a normalized maximum single-cell voltage; and determine the first power adjustment amount according to the normalized maximum single-cell voltage and the second power difference.

[0161] In one embodiment of this disclosure, the control module 1002 is further configured to: acquire the change in the maximum single-cell voltage; and adjust the reduction operation of the recharge limit power of the power battery according to the change.

[0162] In one embodiment of this disclosure, the control module 1002 is further configured to: in response to the maximum single-cell voltage being greater than a second set voltage, reduce the recharge limit power of the power battery with the constraint that the maximum single-cell voltage is controlled near the second set voltage, wherein the first set voltage is less than the second set voltage.

[0163] In one embodiment of this disclosure, the control module 1002 is further configured to: acquire the maximum single-cell voltage; and, in response to the maximum single-cell voltage being greater than a third set voltage, perform a voltage protection operation on the power battery, wherein the second set voltage is less than the third set voltage.

[0164] In one embodiment of this disclosure, the control module 1002 is further configured to: determine that a second power adjustment condition is met in response to the first power difference being less than or equal to the power difference threshold and the maximum single cell voltage being greater than a second set voltage; and reduce the recharge restriction power of the power battery with the maximum single cell voltage being controlled near the second set voltage as a constraint condition.

[0165] In one embodiment of this disclosure, the control module 1002 is further configured to: determine a second voltage difference between the maximum single-cell voltage and the second set voltage; and reduce the recharge limit power of the power battery according to the second voltage difference to obtain a third recharge limit power of the power battery.

[0166] In one embodiment of this disclosure, the control module 1002 is further configured to: determine a second power adjustment amount based on the second voltage difference; and reduce the recharge limit power of the power battery based on the second power adjustment amount to obtain a third recharge limit power of the power battery.

[0167] In one embodiment of this disclosure, the control module 1002 is further configured to: determine the proportional adjustment amount and the integral adjustment amount corresponding to the second voltage difference; and determine the second power adjustment amount based on the proportional adjustment amount and the integral adjustment amount.

[0168] In one embodiment of this disclosure, the control module 1002 is further configured to: determine a third power adjustment amount based on the maximum single-cell voltage, the second set voltage, and the third set voltage; and adjust the third recharge limit power of the power battery based on the third power adjustment amount to obtain a fourth recharge limit power of the power battery.

[0169] In one embodiment of this disclosure, the control module 1002 is further configured to: determine a third voltage difference between the third set voltage and the maximum single-cell voltage; determine a fourth voltage difference between the third set voltage and the second set voltage; and determine a third power adjustment amount based on the third voltage difference and the fourth voltage difference.

[0170] The recharge power control device for a power battery provided in this disclosure acquires the first recharge limit power, the maximum single-cell voltage of the power battery, and the current actual recharge power of the power battery. When the first recharge limit power, the actual recharge power, and the maximum single-cell voltage meet a set first power adjustment condition, the recharge limit power of the power battery is reduced. This reduces the rate of increase of the maximum single-cell voltage of the power battery, avoids the risk of overcharging, protects battery safety, and extends battery life. Adjusting the recharge limit power of the power battery using the first recharge limit power, the actual recharge power, and the maximum single-cell voltage allows for decoupling of the recharge limit power from the state of charge (SOC), improving the accuracy of the recharge limit power adjustment and its adaptability to different operating conditions. By adjusting the recharge limit power to reduce the rate of increase of the maximum single-cell voltage of the power battery, the recharge power limit of the battery can be explored without overvoltage, improving battery recharge performance.

[0171] Figure 11 This is a block diagram illustrating a vehicle according to an exemplary embodiment. For example, vehicle 1100 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicle. Vehicle 1100 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0172] Reference Figure 11 The vehicle 1100 may include various subsystems, such as an infotainment system 1101, a perception system 1102, a decision control system 1103, a drive system 1104, and a computing platform 1105. The vehicle 1100 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and component of the vehicle 1100 can be interconnected via wired or wireless means.

[0173] In some embodiments, the infotainment system 1101 may include a communication system, an entertainment system, and a navigation system, etc.

[0174] The perception system 1102 may include several types of sensors for sensing information about the environment surrounding the vehicle 1100. For example, the perception system 1102 may include a global positioning system (which may be a GPS system, a BeiDou system, or other positioning systems), an inertial measurement unit (IMU), a lidar, a millimeter-wave radar, an ultrasonic radar, and a camera device.

[0175] The decision control system 1103 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0176] The drive system 1104 may include components that provide powered motion to the vehicle 1100. In one embodiment, the drive system 1104 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0177] Some or all of the functions of vehicle 1100 are controlled by computing platform 1105. Computing platform 1105 may include at least one processor 1151 and memory 1152, and processor 1151 may execute instructions 1153 stored in memory 1152.

[0178] Processor 1151 can be any conventional processor, such as a commercially available CPU. Processors may also include graphics processing units (GPUs), field-programmable gate arrays (FPGAs), systems-on-chips (SoCs), application-specific integrated circuits (ASICs), or combinations thereof.

[0179] The memory 1152 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 read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0180] In addition to instruction 1153, memory 1152 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 1152 can be used by computing platform 1105.

[0181] In this embodiment of the disclosure, processor 1151 may execute instruction 1153 to implement all or part of the steps of the power battery recharge power control method provided in this disclosure.

[0182] To implement the above embodiments, this disclosure also proposes a computer-readable storage medium storing computer program instructions thereon, which, when executed by a processor, implement the steps of the power battery recharge power control method provided in this disclosure.

[0183] Alternatively, the computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0184] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0185] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for controlling the recharge power of a power battery, characterized in that, The method includes: The first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery are obtained. In response to the first recharge limit power, the actual recharge power, and the maximum single-cell voltage satisfying a set first power adjustment condition, the recharge limit power of the power battery is reduced from the first recharge limit power to the second recharge limit power to reduce the rate of increase of the maximum single-cell voltage of the power battery; wherein, the second recharge limit power is less than the first recharge limit power.

2. The method according to claim 1, characterized in that, The response to the first recharge limit power, the actual recharge power, and the maximum single-cell voltage satisfying a set first power adjustment condition includes: Obtain the first power difference between the first recharge limit power and the actual recharge power; In response to the first power difference being greater than a set power difference threshold and the maximum single-cell voltage being greater than or equal to a first set voltage, it is determined that the first power adjustment condition is met.

3. The method according to claim 1 or 2, characterized in that, The process of determining the second recharge limit power includes: The actual recharge power of the power battery is boosted to obtain a second recharge limit power of the power battery, wherein the magnitude of the power boost is less than the first power difference.

4. The method according to claim 3, characterized in that, The step of reducing the recharge limit power of the power battery from the first recharge limit power to the second recharge limit power includes: The first power adjustment amount is determined based on the maximum single-cell voltage, the first recharge limit power, and the second recharge limit power; The first recharge limit power is adjusted according to the first power adjustment amount; The maximum single-cell voltage is reacquired to update the first power adjustment amount; Based on the updated first power adjustment amount, the current recharge limit power of the power battery continues to be reduced until it is reduced to the second recharge limit power.

5. The method according to claim 4, characterized in that, Determining the first power adjustment amount based on the maximum single-cell voltage, the first recharge limit power, and the second recharge limit power includes: Obtain the second power difference between the first recharge limit power and the second recharge limit power; The maximum single-cell voltage is normalized based on the first set voltage and the second set voltage to obtain the normalized maximum single-cell voltage. The first power adjustment amount is determined based on the normalized maximum single-cell voltage and the second power difference.

6. The method according to any one of claims 1-5, characterized in that, After reducing the recharge limiting power of the power battery, the method further includes: Obtain the change in the maximum single-cell voltage; Based on the aforementioned changes, the reduction operation of the recharge limit power of the power battery is adjusted.

7. The method according to claim 6, characterized in that, The adjustment of the reduction operation of the recharge limit power of the power battery according to the changes includes: In response to the maximum single-cell voltage being greater than the second set voltage, the recharge limit power of the power battery is reduced with the constraint that the maximum single-cell voltage is controlled near the second set voltage, wherein the first set voltage is less than the second set voltage.

8. The method according to claim 7, characterized in that, After reducing the recharge limit power of the power battery by controlling the maximum single-cell voltage to be near the second set voltage, the method further includes: Obtain the maximum single-cell voltage; In response to the maximum single-cell voltage being greater than a third set voltage, a voltage protection operation is performed on the power battery, wherein the second set voltage is less than the third set voltage.

9. The method according to claim 2, characterized in that, The method further includes: In response to the first power difference being less than or equal to the power difference threshold and the maximum single-cell voltage being greater than the second set voltage, it is determined that the second power adjustment condition is met; With the constraint that the maximum single-cell voltage is controlled near the second set voltage, the recharge limit power of the power battery is reduced.

10. The method according to claim 7 or 9, characterized in that, The reduction of the recharge limitation power of the power battery, with the constraint that the maximum single-cell voltage is controlled near the second set voltage, includes: Determine the second voltage difference between the maximum single-cell voltage and the second set voltage; Based on the second voltage difference, the recharge limit power of the power battery is reduced to obtain the third recharge limit power of the power battery.

11. The method according to claim 10, characterized in that, The step of reducing the recharge limiting power of the power battery based on the second voltage difference to obtain the third recharge limiting power of the power battery includes: The second power adjustment amount is determined based on the second voltage difference; Based on the second power adjustment amount, the recharge limit power of the power battery is reduced to obtain the third recharge limit power of the power battery.

12. The method according to claim 11, characterized in that, The step of determining the second power adjustment amount based on the second voltage difference includes: Determine the proportional adjustment amount and integral adjustment amount corresponding to the second voltage difference; The second power adjustment amount is determined based on the proportional adjustment amount and the integral adjustment amount.

13. The method according to claim 8, characterized in that, The voltage protection operation for the power battery includes: The third power adjustment amount is determined based on the maximum single-cell voltage, the second set voltage, and the third set voltage; Based on the third power adjustment amount, the third recharge limit power of the power battery is adjusted to obtain the fourth recharge limit power of the power battery.

14. The method according to claim 13, characterized in that, The step of determining the third power adjustment amount based on the maximum single-cell voltage, the second set voltage, and the third set voltage includes: Determine the third voltage difference between the third set voltage and the maximum single-cell voltage; Determine a fourth voltage difference between the third set voltage and the second set voltage; The third power adjustment amount is determined based on the third voltage difference and the fourth voltage difference.

15. A power battery recharge power control device, characterized in that, The device includes: The acquisition module is configured to acquire the first recharge limit power of the power battery, the maximum single cell voltage of the power battery, and the current actual recharge power of the power battery. The control module is configured to, in response to the first recharge limit power, the actual recharge power, and the maximum single-cell voltage satisfying a set first power adjustment condition, reduce the recharge limit power of the power battery from the first recharge limit power to a second recharge limit power, so as to reduce the rate of rise of the maximum single-cell voltage of the power battery; wherein the second recharge limit power is less than the first recharge limit power.

16. The apparatus according to claim 15, characterized in that, The control module is also configured to: Obtain the first power difference between the first recharge limit power and the actual recharge power; In response to the first power difference being greater than a set power difference threshold and the maximum single-cell voltage being greater than or equal to a first set voltage, it is determined that the first power adjustment condition is met.

17. The apparatus according to claim 15 or 16, characterized in that, The control module is also configured to: The actual recharge power of the power battery is boosted to obtain a second recharge limit power of the power battery, wherein the magnitude of the power boost is less than the first power difference.

18. The apparatus according to claim 16, characterized in that, The control module is also configured to: In response to the power difference being greater than the power difference threshold and the maximum single-cell voltage being greater than the second set voltage, it is determined that the second power adjustment condition is met; With the constraint that the maximum single-cell voltage is controlled near the second set voltage, the recharge limit power of the power battery is reduced.

19. A vehicle, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured as follows: The steps for implementing the method according to any one of claims 1-14.

20. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When executed by a processor, the program instructions implement the steps of the method described in any one of claims 1-14.

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