Electric power adjusting method of power battery of vehicle, storage medium and program product

Abstract

The invention relates to an electric power adjusting method of a power battery of a vehicle, a storage medium and a program product, and relates to the technical field of power battery management. The method comprises the following steps: acquiring a first target current, a vehicle demand power, a current voltage, a current current, a second target current, an under-voltage target voltage, an under-voltage voltage, an electric power capability power, a monomer minimum voltage and other function adjustment output electric power of a power battery of a vehicle; based on the first target current, the whole vehicle demand power and the current voltage, first limiting electric power is determined; determining a second limited electric power based on the second target current, the current voltage, the under-voltage target voltage, the current current, the vehicle demand power and the monomer minimum voltage; determining third limiting electric power according to the working state of the power battery, the first limiting electric power and the second limiting electric power; a target limited electrical power is selected from the third limited electrical power and the other functionally regulated output electrical power.

Description

[0001] This application claims priority to Chinese Patent Application No. 202510892826.1, filed June 30, 2025, entitled "Method for Regulating Electric Power of Power Battery of Vehicle, Storage Medium and Program Product", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of power battery management, and in particular to a method for regulating electric power of a power battery of a vehicle, a storage medium and a program product. BACKGROUND

[0003] As a core energy storage component of a new energy vehicle, the power battery has extremely strict boundaries when in use (overcurrent, undervoltage and overvoltage phenomena are not allowed). When calculating the use power of each electric drive, the vehicle controller needs to consider the use boundary of the battery power. If the use boundary of the battery is exceeded, the use power of the battery needs to be adjusted in time to avoid triggering a battery fault and causing loss of vehicle power and safety problems.

[0004] In related technologies, the vehicle control unit increases the corresponding control strategy for regulating the use power of the power battery, rather than directly using the use power capacity issued by the battery management system. Most vehicle controllers currently use a two-dimensional table based on the state of charge of the battery and the temperature of the battery to limit the power capacity of the battery, and take the extreme value (minimum value for discharging and maximum value for charging) of the power capacity issued on the CAN (Controller Area Network) of the battery.

[0005] However, the above-mentioned method for regulating electric power of a power battery of a vehicle is relatively rough, and the effect of regulating the power of the power battery is poor. SUMMARY

[0006] Embodiments of the present application provide a method for regulating electric power of a power battery of a vehicle, a storage medium and a program product, which can improve the effect of regulating the power of the power battery. The technical solution is as follows:

[0007] On the one hand, a method for regulating electric power of a power battery of a vehicle is provided, which is executed by a vehicle control unit, and the method comprises:

[0008] acquire a first target current of a power battery of a vehicle, a total vehicle demand power, a current voltage, a current current, a second target current, an under-voltage target voltage, an under-voltage voltage, an electric power capability power, a single cell minimum voltage, and other function regulation output electric power, the first target current being a maximum current allowed by the power battery, the second target current being a maximum current allowed by the power battery when the power battery is at the under-voltage voltage, the under-voltage target voltage being an under-voltage protection threshold of the power battery, the electric power capability power being a maximum power that the power battery can output per unit time, the single cell minimum voltage being a minimum voltage of a single cell battery in the power battery, and the other function regulation output electric power being regulation electric power of other function systems in the vehicle other than regulation electric power of the power battery;

[0009] determine a first limited electric power based on the first target current, the total vehicle demand power, and the current voltage;

[0010] determine a second limited electric power based on the second target current, the current voltage, the under-voltage target voltage, the current current, the total vehicle demand power, and the single cell minimum voltage;

[0011] determine a third limited electric power according to a working state of the power battery, the first limited electric power, and the second limited electric power, the working state being one of a charging state and a discharging state;

[0012] select a target limited electric power from the third limited electric power and the other function regulation output electric power.

[0013] In another aspect, a device for electric power regulation of a power battery of a vehicle is provided, and the device comprises:

[0014] a first acquisition module, configured to acquire a first target current of a power battery of a vehicle, a total vehicle demand power, a current voltage, a current current, a second target current, an under-voltage target voltage, an under-voltage voltage, an electric power capability power, a single cell minimum voltage, and other function regulation output electric power, the first target current being a maximum current allowed by the power battery, the second target current being a maximum current allowed by the power battery when the power battery is at the under-voltage voltage, the under-voltage target voltage being an under-voltage protection threshold of the power battery, the electric power capability power being a maximum power that the power battery can output per unit time, the single cell minimum voltage being a minimum voltage of a single cell battery in the power battery, and the other function regulation output electric power being regulation electric power of other function systems in the vehicle other than regulation electric power of the power battery;

[0015] a first limited electric power determination module configured to determine a first limited electric power based on the first target current, the whole vehicle demand power and the current voltage;

[0016] a second limited electric power determination module configured to determine a second limited electric power based on the second target current, the current voltage, the under-voltage target voltage, the current current, the whole vehicle demand power and the lowest single cell voltage;

[0017] a third limited electric power determination module configured to determine a third limited electric power according to a working state of the power battery, the first limited electric power and the second limited electric power, the working state being one of a charging state and a discharging state;

[0018] a target limited electric power selection module configured to select a target limited electric power from the third limited electric power and the other functional regulation output electric power.

[0019] In a possible implementation, the first limited electric power determination module is configured to,

[0020] calculate a first offset current by a PI algorithm according to the first target current, the whole vehicle demand power and the current voltage, the first offset current being a current value for regulating current when the power battery is in overcurrent;

[0021] determine a first regulation target current according to the first target current and the first offset current;

[0022] obtain a product of the first regulation target current and the current voltage as a first regulation limited power;

[0023] obtain an extreme value of the first regulation limited power and the electric power capability power to obtain the first limited electric power.

[0024] In a possible implementation, the first limited electric power determination module is configured to,

[0025] calculate a first whole vehicle demand current according to the whole vehicle demand power and the current voltage;

[0026] calculate a limited power current according to the battery limited power and the current voltage;

[0027] in a case where a difference between the first target current and the first whole vehicle demand current is less than a first calibration threshold, take a difference between the first target current and the limited power current as a target, and execute a current sum value of P regulation and I regulation as the first offset current.

[0028] In a possible implementation, the second limited electric power determination module,

[0029] The second bias current is calculated by a PID algorithm according to the second target current, the under-voltage target voltage, the whole vehicle demand power, the current voltage, the current current and the single cell minimum voltage, and the second bias current is a current value of the current for adjusting the current when the power battery is in the under-voltage state.

[0030] The second adjustment target current is determined according to the second target current and the second bias current.

[0031] The product of the second adjustment target current and the under-voltage voltage is obtained as a second adjustment limited power.

[0032] The extreme value of the second adjustment limited power and the electric power capability power is obtained as a second limited electric power.

[0033] In a possible implementation, the second limited electric power determination module,

[0034] The second whole vehicle demand current is calculated according to the whole vehicle demand power and the current voltage.

[0035] The under-voltage maximum allowable current is calculated according to the target limited electric power and the under-voltage target voltage.

[0036] In a case where the difference between the under-voltage maximum allowable current and the second whole vehicle demand current is less than a second calibration threshold, the difference between the maximum allowable current and the second whole vehicle demand current is taken as a target, and a current sum value of P-term adjustment, I-term adjustment and D-term adjustment is taken as the second bias current.

[0037] In a possible implementation, the third limited electric power determination module,

[0038] When the power battery is in a charging state, the maximum value of the first limited electric power and the second limited electric power is obtained as the third limited electric power; or,

[0039] When the power battery is in a discharging state, the minimum value of the first limited electric power and the second limited electric power is obtained as the third limited electric power.

[0040] In a possible implementation, the device further comprises:

[0041] The second obtaining module is configured to obtain a third target current of a power battery of the vehicle and a battery actual electric power, wherein the third target current is a maximum current allowed by an HVSC (High-Voltage Switch Controller) module according to a vehicle power reservation strategy.

[0042] The fourth limiting electric power determination module is configured to determine a fourth limiting electric power based on the third target current, the electric power capability power, the vehicle demand power and the battery actual electric power.

[0043] The third limiting electric power determination module is configured to determine a third limiting electric power according to the working state of the power battery, the first limiting electric power, the second limiting electric power and the fourth limiting electric power.

[0044] In yet another aspect, a computer device is provided, which includes a processor and a memory, and the memory stores at least one instruction, at least one program, a code set or an instruction set, which are loaded and executed by the processor to implement the electric power adjustment method of the power battery of the vehicle as described above.

[0045] In yet another aspect, a computer readable storage medium is provided, which stores at least one instruction, at least one program, a code set or an instruction set, which are loaded and executed by a processor to implement the electric power adjustment method of the power battery of the vehicle as described above.

[0046] In yet another aspect, a computer program product is provided, which includes a computer program stored in a computer readable storage medium. A processor of a computer device reads the computer program from the computer readable storage medium, and the processor executes the computer program to enable the computer device to perform the electric power adjustment method of the power battery of the vehicle provided in the various optional implementation manners described above.

[0047] The technical solution provided in the present application can have the following beneficial effects:

[0048] The vehicle control unit determines the maximum electric power (first limited electric power) of the power battery in the overcurrent state and the maximum electric power (second limited electric power) of the power battery in the undervoltage state by considering various parameters, further determines a third limited electric power in combination with the working state (charging state or discharging state) of the power battery, and finally selects an optimal target limited electric power from the third limited electric power and other function regulated output electric powers, so as to realize dynamic and accurate regulation of the output capacity of the power battery, effectively prevent safety hazards such as overcurrent and undervoltage, and effectively improve the electric power regulation effect of the power battery of the vehicle.

[0049] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0050] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0051] Figure 1 is a system structure diagram of an electric power regulation system of a power battery of a vehicle related to an embodiment of the present application;

[0052] Figure 2 is a flowchart of an electric power regulation method of a power battery of a vehicle provided by an embodiment of the present application;

[0053] Figure 3 is a flowchart of an electric power regulation method of a power battery of a vehicle provided by an embodiment of the present application;

[0054] Figure 4 is a flowchart of an electric power regulation method of a power battery of a vehicle provided by an embodiment of the present application;

[0055] Figure 5 is a flowchart of an electric power regulation method of a power battery of a vehicle provided by an embodiment of the present application;

[0056] Figure 6 is a structure diagram of an algorithm subject for preventing overcharge and undervoltage of a battery provided by an embodiment of the present application;

[0057] Figure 7 is an algorithm structure diagram of a PI regulation current offset reduction value for overcurrent protection of a battery provided by an embodiment of the present application;

[0058] Figure 8 is an algorithm structure diagram of a PID regulation current offset reduction value for undervoltage protection of a battery provided by an embodiment of the present application;

[0059] Figure 9is a structure diagram of an algorithm subject for preventing overcharge and under-voltage of a battery provided by an embodiment of the present application;

[0060] Figure 10 is a block diagram of an electric power regulating device of a power battery of a vehicle provided by an exemplary embodiment of the present application;

[0061] Figure 11 is a structure diagram of a computer device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0062] The exemplary embodiments will be described in detail herein with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0063] Reference is made to Figure 1 , Figure 1 is a system configuration diagram of an electric power regulating system of a power battery of a vehicle related to an embodiment of the present application.

[0064] As shown in Figure 1 , the vehicle 100 has a vehicle control unit 10a and a power battery 10b.

[0065] The vehicle control unit 10a can acquire a first target current, a total vehicle demand power, a current voltage, a current current, a second target current, an under-voltage target voltage, an under-voltage voltage, an electric power capability power, a single cell minimum voltage and other function regulating output electric power of the power battery 10b of the vehicle 100, the first target current is a maximum current allowed by the power battery 10b, the second target current is a maximum current allowed by the power battery 10b when the power battery 10b is at the under-voltage voltage, the under-voltage target voltage is an under-voltage protection threshold of the power battery 10b, the electric power capability power is a maximum power that the power battery 10b can output in a unit time, the single cell minimum voltage is a minimum voltage of a single cell battery in the power battery 10b, and the other function regulating output electric power is a regulating electric power of other function systems in the vehicle 100 except for the regulating electric power of the power battery 10b; determine a first limiting electric power based on the first target current, the total vehicle demand power and the current voltage; determine a second limiting electric power based on the second target current, the current voltage, the under-voltage target voltage, the current current, the total vehicle demand power and the single cell minimum voltage; determine a third limiting electric power according to a working state, the first limiting electric power and the second limiting electric power of the power battery 10b, the working state being one of a charging state and a discharging state; and select a target limiting electric power from the third limiting electric power and the other function regulating output electric power.

[0066] Please refer to Figure 2 , Figure 2 is a flowchart of a method for regulating electric power of a power battery of a vehicle according to an embodiment of the present application. The method for regulating electric power of the power battery of the vehicle can be executed by a vehicle control unit, such as the vehicle control unit 10a shown in the above-mentioned vehicle control unit. The method for regulating electric power of the power battery of the vehicle can include the following steps: Figure 1

[0067] Step 210: obtaining a first target current of the power battery of the vehicle, a demand power of the vehicle, a current voltage, a current current, a second target current, an under-voltage target voltage, an under-voltage voltage, an electric power capability power, a single cell minimum voltage, and an output electric power of other functions. The first target current is the maximum current allowed by the power battery. The second target current is the maximum current allowed by the power battery when the power battery is at the under-voltage voltage. The under-voltage target voltage is the under-voltage protection threshold of the power battery. The electric power capability power is the maximum power that the power battery can output in a unit of time. The single cell minimum voltage is the minimum voltage of the single cell battery in the power battery. The output electric power of other functions is the regulated electric power of other function systems in the vehicle, in addition to the regulated electric power of the power battery.

[0068] In the above-mentioned vehicle, the power battery is a battery pack composed of at least two single cell batteries.

[0069] In the above-mentioned vehicle, the first target current is the maximum current allowed by the vehicle in the working state. The first target current is used to determine whether the power battery is in an overcurrent state. When the actual charging current of the power battery exceeds the first target current, it indicates that the power battery is in an overcurrent state. When the actual charging current of the power battery does not exceed the first target current, it indicates that the power battery is not in an overcurrent state.

[0070] In some embodiments, the first target current can be preset by an engineer and stored in the vehicle control unit. The vehicle control unit directly obtains the first target current.

[0071] In the above-mentioned vehicle, the demand power of the vehicle is the demand power calculated by the vehicle control unit according to the current vehicle working condition.

[0072] In the above-mentioned vehicle, the current voltage is the current total voltage of the power battery, and the current current is the current charging and discharging current of the power battery.

[0073] In the embodiments of the present application, the vehicle control unit can obtain the above-mentioned parameters from the battery management system and the power system controller of the vehicle through the CAN (Controller Area Network) bus.

[0074] ​Step 220: determining the first limited electric power based on the first target current, the demand power of the whole vehicle, and the current voltage.

[0075] The first limited electric power is the maximum electric power allowed by the power battery under the demand power of the whole vehicle and the current voltage.

[0076] In some embodiments, the vehicle control unit can store a first relationship table of the first target current, the demand power of the whole vehicle, the current voltage, and the first limited electric power. The vehicle control unit can query the corresponding first limited electric power in the first relationship table by the first target current, the demand power of the whole vehicle, and the current voltage. In the first relationship table, the first target current, the demand power of the whole vehicle, and the current voltage are in a corresponding relationship with the first limited electric power.

[0077] In other embodiments, the vehicle control unit can obtain the first limited electric power corresponding to the first target current, the demand power of the whole vehicle, and the current voltage based on the first target current, the demand power of the whole vehicle, and the current voltage by a first algorithm model. The first algorithm model is a machine learning model that has the ability to deduce the first limited electric power based on the first target current, the demand power of the whole vehicle, and the current voltage.

[0078] Step 230: determining the second limited electric power based on the second target current, the current voltage, the target voltage under voltage drop, the current, the demand power of the whole vehicle, and the lowest voltage of the single battery.

[0079] The second limited electric power is a power limit value calculated by comprehensively considering various factors when the power battery is in the voltage drop state, i.e., the maximum electric power allowed by the power battery in the voltage drop state.

[0080] In some embodiments, the vehicle control unit can store a second relationship table of the second target current, the current voltage, the target voltage under voltage drop, the current, the demand power of the whole vehicle, and the lowest voltage of the single battery. The vehicle control unit can query the corresponding second limited electric power in the second relationship table by the second target current, the current voltage, the target voltage under voltage drop, the current, the demand power of the whole vehicle, and the lowest voltage of the single battery. In the second relationship table, the second target current, the current voltage, the target voltage under voltage drop, the current, the demand power of the whole vehicle, and the lowest voltage of the single battery are in a corresponding relationship with the second limited electric power.

[0081] In some embodiments, the vehicle control unit can obtain, based on the second target current, the current voltage, the under-voltage target voltage, the current current, the whole vehicle demand power and the single cell minimum voltage, a second limited electric power corresponding to the second target current, the current voltage, the under-voltage target voltage, the current current, the whole vehicle demand power and the single cell minimum voltage through a second algorithm model, which is a machine learning model having the ability to deduce the second limited electric power based on the second target current, the current voltage, the under-voltage target voltage, the current current, the whole vehicle demand power and the single cell minimum voltage.

[0082] Step 240: determining a third limited electric power according to the working state of the power battery, the first limited electric power and the second limited electric power, the working state being one of a charging state and a discharging state.

[0083] The third limited electric power is one of the first limited electric power and the second limited electric power.

[0084] Step 250: selecting a target limited electric power from the third limited electric power and other function-regulated output electric powers.

[0085] The target limited electric power is the upper limit value of the actual output electric power of the power battery.

[0086] In the embodiments of the present application, the vehicle control unit determines the maximum electric power of the power battery in the over-current state (the first limited electric power) and the maximum electric power of the power battery in the under-voltage state (the second limited electric power) by considering various parameters, further determines the third limited electric power in combination with the working state of the power battery (the charging state or the discharging state), and finally selects the optimal target limited electric power from the third limited electric power and other function-regulated output electric powers, thereby realizing dynamic and accurate regulation of the output capacity of the power battery, effectively preventing safety hazards such as over-current and under-voltage, and effectively improving the electric power regulation effect of the power battery of the vehicle.

[0087] Based on Figure 2 the embodiments shown in the drawings, reference is made to Figure 3 which shows a flowchart of a method for regulating the electric power of a power battery of a vehicle according to an embodiment of the present application. As shown in Figure 3 the embodiments shown in the drawings, reference is made to Figure 2 Step 220 can be implemented as step 220a, step 220b, step 220c and step 220d:

[0088] Step 220a: calculating a first offset current according to the first target current, the whole vehicle demand power and the current voltage through a PI algorithm, the first offset current being a current value for regulating the current when the power battery is in over-current.

[0089] The first offset current is a compensation current generated by feedback control when the vehicle control unit detects that the current of the power battery is close to the first target current, and is used to reduce the output power of the power battery to prevent overcurrent.

[0090] The PI algorithm is a proportional-integral control algorithm used for error adjustment in a closed-loop control system.

[0091] In the embodiments of the present application, the vehicle control unit dynamically adjusts the value of the first offset current by the PI algorithm, ensuring that the power battery meets the power demand of the vehicle while avoiding safety risks caused by instantaneous overcurrent.

[0092] Step 220b: determining a first adjusted target current according to the first target current and the first offset current.

[0093] The first adjusted target current is obtained by correcting the first target current according to the first offset current, i.e., the maximum current allowed by the vehicle in the working state after correction.

[0094] For example, the first adjusted target current is obtained by subtracting the first offset current from the first target current.

[0095] For example, the first target current is 200A, the first offset current is 3A, and the first adjusted target current obtained by subtracting the first offset current from the first target current is 197A.

[0096] Step 220c: obtaining the product of the first adjusted target current and the current voltage as a first adjusted limit power.

[0097] In the embodiments of the present application, the first adjusted limit power represents the maximum power that the power battery can output under the limitation of the first adjusted target current after the vehicle control unit corrects the first target current.

[0098] For example, the current voltage of the power battery is 400V, the first adjusted target current is 197A, and the first adjusted limit power = 400V*197A = 78.8kW.

[0099] Step 220d: obtaining the first limit electric power by taking the extreme value of the first adjusted limit power and the electric power capability power.

[0100] In the embodiments of the present application, the vehicle control unit takes the extreme value of the first adjusted limit power and the electric power capability power as the first limit electric power of the power battery according to the working state of the power battery.

[0101] When the power battery is in a discharging state, the vehicle control unit takes the smaller one of the first adjusted limiting power and the electric power capability power as the first limited electric power; when the power battery is in a charging state, the vehicle control unit takes the larger one of the first adjusted limiting power and the electric power capability power as the first limited electric power.

[0102] In the embodiment of the application, the vehicle control unit calculates the first offset current by introducing the PI algorithm, corrects the first target current, obtains the first adjusted limiting power, and based on the feedback control method, the first adjusted limiting electric power can be accurately corrected, the dynamic adjustment of the limiting electric power of the power battery is realized, the safety risk caused by instantaneous overcurrent is avoided while meeting the demand power of the vehicle, the reliability of the power battery operation is ensured, and the electric power regulation effect of the power battery of the vehicle is improved.

[0103] Based on the scheme shown in any of the above embodiments, in a possible implementation manner, Figure 3 Step 220a in the above embodiment can be implemented as follows: a first vehicle demand current is calculated according to the vehicle demand power and the current voltage; a limiting power current is calculated according to the battery limiting power and the current voltage; in a case where a difference between the first target current and the first vehicle demand current is less than a first calibration threshold, a difference between the first target current and the limiting power current is taken as a target, and a current sum of the P adjustment and the I adjustment is taken as the first offset current.

[0104] The first vehicle demand current can be obtained by dividing the vehicle demand power by the current voltage.

[0105] For example, the vehicle demand power is 100 kW, the current voltage is 400 V, and the first vehicle demand current is 250 A, which is obtained by dividing the vehicle demand power by the current voltage.

[0106] The limiting power current can be obtained by dividing the battery limiting power by the current voltage.

[0107] For example, the battery limiting power is 75 kW, the current voltage is 400 V, and the limiting power current is 187.5 A, which is obtained by dividing the battery limiting power by the current voltage.

[0108] In the embodiment of the application, the vehicle control unit obtains a difference between the first target current and the first vehicle demand current, compares the difference with the first calibration threshold, obtains a difference between the first target current and the limiting power current in a case where the difference is less than the first calibration threshold, takes the difference between the first target current and the limiting power current as a target, respectively performs the P adjustment and the I adjustment, and takes a current sum of the P adjustment result and the I adjustment as the first offset current.

[0109] In the embodiment of the present application, whether the adjustment mechanism needs to be started is determined by the calibration threshold value, and after the adjustment mechanism is started, the difference between the whole vehicle demand current and the limited power current is introduced as the control input, and on this basis, the P term adjustment and the I term adjustment are performed on the difference, so that the accurate current compensation value can be effectively obtained, the accuracy of the current compensation is effectively improved, and the power regulation effect of the power battery of the vehicle is improved as a whole.

[0110] In some other embodiments, in a case where the difference between the first target current and the first whole vehicle demand current is greater than the first calibration threshold value, the current does not need to be adjusted, and the difference between the first target current and the current corresponding to the first whole vehicle demand power is directly outputted to quickly improve the output power limiting capability.

[0111] The current corresponding to the first whole vehicle demand power is the first demand current obtained by dividing the first whole vehicle demand power by the current voltage.

[0112] In the embodiment of the present application, the vehicle control unit directly outputs the difference between the first target current and the first whole vehicle demand current when the difference between the first target current and the first whole vehicle demand current is greater than the first calibration threshold value, skips the adjustment process of the current, and quickly improves the power limiting capability, so that the power regulation effect of the power battery of the vehicle can be improved.

[0113] Based on Figure 2 the embodiment shown in FIG. 8, reference is made to FIG. 9, which shows a flowchart of a power regulation method of a power battery of a vehicle provided by an embodiment of the present application. As shown in Figure 4 FIG. 9, Figure 4 FIG. 9, Figure 2 The step 230 can be implemented as a step 230a, a step 230b, a step 230c, and a step 230d:

[0114] The step 230a: according to the second target current, the under-voltage target voltage, the whole vehicle demand power, the current voltage, the current, and the single cell minimum voltage, a second offset current is calculated by a PID algorithm, and the second offset current is a current value for adjusting the current when the power battery is in under-voltage.

[0115] The second offset current is a compensation current calculated based on a PID control algorithm, which is used to reduce the output of the power battery to prevent the voltage from further decreasing when the power battery is in under-voltage.

[0116] The PID control algorithm is a proportional-integral-derivative algorithm, which is used for error adjustment in a closed-loop control system.

[0117] In the embodiment of the present application, the vehicle control unit dynamically adjusts the second offset current by the PID algorithm, so that the power battery can maintain stable output when the voltage rapidly decreases, and sudden power failure or performance drop caused by under-voltage is prevented.

[0118] Step 230b: determining a second adjustment target current according to the second target current and the second offset current.

[0119] The second adjustment target current is obtained by correcting the second target current according to the second offset current, that is, the maximum current allowed by the vehicle in the under-voltage state after correction.

[0120] For example, the second adjustment target current is obtained by subtracting the second offset current from the second target current.

[0121] For example, the second target current is 190A, the second offset current is 10A, and the second adjustment target current obtained by subtracting the second offset current from the second target current is 180A.

[0122] Step 230c: obtaining the product of the second adjustment target current and the under-voltage voltage as the second adjustment limit power.

[0123] In the embodiment of the present application, the second adjustment limit power represents the maximum power that the power battery can output under the limitation of the second adjustment target current after the vehicle control unit corrects the second target current.

[0124] Step 230d: obtaining the extreme value of the second adjustment limit power and the electric power capability power as the second limit electric power.

[0125] In the embodiment of the present application, the vehicle control unit takes the extreme value of the second adjustment limit power and the electric power capability power as the first limit electric power of the power battery according to the working state of the power battery.

[0126] When the power battery is in the discharging state, the vehicle control unit takes the smaller one of the second adjustment limit power and the electric power capability power as the second limit electric power, and when the power battery is in the charging state, the vehicle control unit takes the larger one of the second adjustment limit power and the electric power capability power as the second limit electric power.

[0127] In the embodiment of the present application, the vehicle control unit calculates the second offset current by introducing the PID algorithm, dynamically corrects the second target current, obtains the second regulated limit power, and based on the feedback control method, the second regulated limit power can be accurately corrected, the dynamic adjustment of the limit power of the power battery is realized, the influence of the battery voltage drop, especially the lowest voltage of the single battery on the overall performance is considered, more accurate under-voltage protection control of the power battery is realized, the reliability of the power battery operation is ensured, and the power battery power regulation effect of the vehicle is improved.

[0128] Based on the scheme shown in any of the above embodiments, in a possible implementation manner, Figure 4 Step 230a in the embodiment can be implemented as follows: calculating a second vehicle demand current according to the vehicle demand power and the current voltage; calculating an under-voltage maximum allowable current according to the target limit power and the under-voltage target voltage; in the case that the difference between the under-voltage maximum allowable current and the second vehicle demand current is less than the second calibration threshold, taking the difference between the maximum allowable current and the second vehicle demand current as a target, and executing the P term regulation, the I term regulation and the D term regulation current sum as the second offset current.

[0129] The second vehicle demand current can be obtained by dividing the vehicle demand power by the current voltage.

[0130] The under-voltage maximum allowable current can be obtained by dividing the target limit power by the under-voltage target voltage.

[0131] For example, the target limit power is 60kW, the under-voltage target voltage is 340V, and the under-voltage maximum allowable current calculated by dividing the target limit power by the under-voltage target voltage is 176.5A, which is the under-voltage maximum allowable current.

[0132] In the embodiment of the present application, the vehicle control unit obtains the difference between the under-voltage maximum allowable current and the second vehicle demand current, compares the difference with the second calibration threshold, obtains the difference between the maximum allowable current and the second vehicle demand current in the case that the difference is less than the second calibration threshold, takes the difference between the maximum allowable current and the second vehicle demand current as a target, respectively executes the P term regulation, the I term regulation and the D term regulation, and obtains the P term regulation result, the I term regulation and the D term regulation current sum as the second offset current.

[0133] In this embodiment, a calibrated threshold is used to determine whether the adjustment mechanism needs to be activated. After the adjustment mechanism is activated, the difference between the maximum allowable undervoltage current and the second vehicle demand current is introduced as a control input. Based on this, P-term adjustment, I-term adjustment, and D-term adjustment are performed on the difference, which can effectively obtain an accurate current compensation value and improve the accuracy of current compensation. This makes the power battery more adaptable to complex situations such as voltage fluctuations and sudden load changes, provides a more refined undervoltage protection strategy for the power battery, and thus improves the overall power regulation effect of the vehicle's power battery.

[0134] In other embodiments, when the difference between the maximum allowable undervoltage current and the second vehicle demand current is greater than the second calibration threshold, there is no need to adjust the current; the difference between the maximum allowable undervoltage current and the second vehicle demand current is directly output to quickly improve the output power limiting capability.

[0135] based on Figure 2 The illustrated embodiment, with reference to Figure 5 This illustrates a flowchart of a method for regulating the electric power of a vehicle's power battery according to an embodiment of this application. Figure 5 As shown, Figure 2 Step 240 can be implemented as steps 240a and 240b, as detailed below.

[0136] Step 240a: When the power battery is in a charging state, obtain the maximum value between the first limit power and the second limit power, and determine it as the third limit power.

[0137] In this embodiment, the power battery being in a charging state indicates that the power battery is currently receiving energy input and its state of charge is increasing.

[0138] In this embodiment, the vehicle control unit determines whether the power battery is currently charging through the vehicle's BMS (Battery Management System). If the power battery is currently charging, the larger of the first limit power and the second limit power is used as the third limit power.

[0139] For example, if the first power limit is 60kW, the second power limit is 70kW, and the power battery is in a charging state, then the third power limit is 70kW.

[0140] Step 240b: When the power battery is in a discharging state, obtain the minimum value between the first limit power and the second limit power, and determine it as the third limit power.

[0141] In the embodiments of the present application, the power battery in the discharging state means that the power battery is currently supplying power to the motor or other loads of the vehicle, and the state of charge is decreasing.

[0142] In the embodiments of the present application, the vehicle control unit determines whether the power battery is currently in the discharging state through the BMS of the vehicle. If the power battery is currently in the discharging state, the smaller one of the first limited electric power and the second limited electric power is obtained as the third limited electric power.

[0143] For example, the first limited electric power is 80 kW, the second limited electric power is 65 kW, and the battery is in the discharging state, then the third limited electric power is 65 kW.

[0144] In the embodiments of the present application, the vehicle control unit selects the maximum or minimum of the first limited electric power and the second limited electric power according to the working state (charging or discharging) of the power battery, and determines the third limited electric power, which fully considers the electrochemical characteristics and safety boundaries of the power battery in different working modes: in the charging state, the charging efficiency is prioritized, and the larger limited electric power is selected; in the discharging state, over-discharge is prevented, and the smaller limited electric power is selected. Through the differential control logic, the electric power regulation efficiency of the power battery of the vehicle is effectively improved, so that the use efficiency of the power battery is improved as a whole, and the life management capability of the power battery is also enhanced.

[0145] Based on Figure 2 to Figure 5 According to any one or more embodiments, in a possible implementation, the vehicle control unit can further obtain a third target current of the power battery of the vehicle, and an actual electric power of the battery, the third target current being the maximum current allowed calculated by the HVSC module according to the vehicle power reservation strategy;

[0146] Based on the third target current, the electric power capability power, the vehicle demand power, and the actual electric power of the battery, a fourth limited electric power is determined.

[0147] The third limited electric power is determined according to the working state of the power battery, the first limited electric power, the second limited electric power, and the fourth limited electric power, the working state being one of the charging state and the discharging state.

[0148] The target limited electric power is selected from the third limited electric power and other functional regulation output electric powers.

[0149] The third target current is a maximum current value allowed to be used by the power battery calculated by the HVSC module according to a vehicle power reservation strategy, considering factors such as battery state, thermal management capability, driving demand and system safety, and the third target current is a system-level current capability target actively distributed by the vehicle control unit within the safety boundary of the power battery (for example, not exceeding the first target current and the second target current).

[0150] The battery actual electric power refers to the active power value actually input or output by the power battery at the current moment, and can be calculated by the instantaneous product of the sampled battery terminal voltage and total current in the vehicle high-voltage system.

[0151] In a possible implementation, the fourth limit electric power is determined based on the third target current, the electric power capability power, the vehicle demand power and the battery actual electric power, which can be implemented as:

[0152] The third offset current is calculated by a PID algorithm based on the battery actual electric power, the vehicle demand power and the electric power capability power, and the third offset current is a current value used for adjusting the current when the power of the power battery is in over-discharge.

[0153] The third adjustment target current is determined according to the third target current and the third offset current.

[0154] The extreme value between the third adjustment target current and the electric power capability power is taken as the fourth limit electric power.

[0155] The third adjustment target current is obtained by subtracting the third offset current from the third target current.

[0156] When the power battery is in a discharging state, the vehicle control unit takes the smaller one of the third adjustment target current and the electric power capability power as the fourth limit electric power, and when the power battery is in a charging state, the vehicle control unit takes the larger one of the third adjustment target current and the electric power capability power as the fourth limit electric power.

[0157] In a possible implementation, the third offset current is calculated by a PID algorithm based on the battery actual electric power, the vehicle demand power and the electric power capability power, which can be implemented as:

[0158] An electric power difference between the electric power capability power and the vehicle actual electric power is obtained.

[0159] When the electric power difference is less than a third calibration threshold, the electric power difference is taken as a target, and the current sum of P adjustment, I adjustment and D adjustment is taken as the third offset current.

[0160] In a possible implementation, the determination of the third limit electric power according to the working state of the power battery, the first limit electric power, the second limit electric power and the fourth limit electric power can be implemented as follows:

[0161] When the power battery is in the charging state, the maximum value of the first limit electric power, the second limit electric power and the fourth limit electric power is obtained as the third limit electric power; or,

[0162] When the power battery is in the discharging state, the minimum value of the first limit electric power, the second limit electric power and the fourth limit electric power is obtained as the third limit electric power.

[0163] In the embodiments of the present application, the vehicle control unit determines the maximum electric power (the first limit electric power) of the power battery in the overcurrent state, the maximum electric power (the second limit electric power) of the power battery in the undervoltage state and the maximum electric power (the fourth limit electric power) of the power battery in the power overdischarge state by considering various parameters, and further determines the third limit electric power in combination with the working state (the charging state or the discharging state) of the power battery, so as to finally select the optimal target limit electric power from the third limit electric power and other function-adjusted output electric powers, thereby realizing dynamic and accurate adjustment of the output capability of the power battery, effectively preventing safety hazards such as overcurrent and undervoltage, and effectively improving the electric power adjustment effect of the power battery of the vehicle.

[0164] For example, based on the above-mentioned algorithm structure, the third limit electric power is determined as follows: Figure 2 to Figure 5 According to any one or more embodiments, the embodiments of the present application propose an algorithm structure for preventing overcurrent and undervoltage (overvoltage) of a battery.

[0165] In view of the complexity of the whole vehicle use power and working condition of the electric vehicle, the function of the vehicle is ensured to be normal from the whole vehicle use level. The whole vehicle control needs to reduce the battery use electric power in advance in the control level to avoid the BMS (battery management system) reporting overcurrent fault, undervoltage fault and overvoltage fault of the battery, so the adjustment module of the whole vehicle control for the battery electric power needs to increase the corresponding algorithm to ensure its reliability, and the electric power capability is reduced in time when the use electric power is too large, and the electric power capability is released in time when the actual distance is within a certain range from the safety boundary, so as to ensure the power utilization rate and the continuity of the power. Based on this, the technical requirements of the present case for the anti-throw algorithm structure are as follows:

[0166] (1) The overcurrent limit adjustment and undervoltage (overvoltage) limit adjustment algorithm is added on the basis of the original strategy;

[0167] (2) The overcurrent and undervoltage (overvoltage) adjustment is to calculate the current boundary as the adjustment means, so that it can be quickly and accurately controlled;

[0168] (3) The overcurrent regulation needs to consider the cumulative efficiency of overcurrent, so it needs to use PI-based principle for table adjustment;

[0169] (4) The under (over) voltage regulation needs to consider the voltage rate and under-voltage duration, so it needs to use PID-based principle for table adjustment;

[0170] (5) When non-regulation is required, the battery's electric power capability needs to be released in time to ensure the power use power range and power smoothness.

[0171] For the above five requirements, the implementation process is described in detail as follows in the design:

[0172] Since the battery overcurrent, under (over) voltage regulation is a part of the multiple function of the battery use power regulation, two function algorithm structures can be added on the basis of the original, please refer to Figure 6 , which shows the structure diagram of the algorithm main body for preventing battery overcharge and under-voltage according to an embodiment of the application.

[0173] As shown in Figure 6 , in the overcurrent limit, the vehicle control unit calculates the overcurrent target current of the power battery through the feedback electric power capability power H at the A1 node, and calculates the battery overcurrent regulation offset current B1 according to the feedback electric power capability power H, the A1 node overcurrent target current, the whole vehicle demand power and the current voltage of the power battery. The target current C1 is obtained by subtracting B1 from A1, the adjusted electric power capability limit power D1 is obtained by multiplying the target current C1 and the current voltage of the power battery, and the overcurrent electric power limit capability power E1 is obtained by taking the extreme value of the front-end battery electric power limit and the adjusted electric power capability limit power D1.

[0174] In the under (over) voltage regulation, the vehicle control unit calculates the overcurrent target current of the power battery in the under-voltage state through the electric power capability power feedback power H and the under (over) voltage target voltage at the A2 node, and calculates the battery under (over) voltage regulation offset current B2 according to the electric power capability power feedback value H, the under-voltage target, the whole vehicle demand power, the current voltage of the battery, the current and the minimum voltage of the battery monomer. The target current C2 is obtained by subtracting B2 from A2, the adjusted electric power capability power D2 is obtained by multiplying the target current C2 and the under-voltage voltage, and the under-voltage electric power limit capability power E2 is obtained by taking the extreme value of the front-end battery electric power limit and the adjusted electric power capability power D2.

[0175] The extreme values of the overcurrent electric power limiting capability power E1 and the under-voltage electric power limiting capability power E2 (the minimum value for discharging and the maximum value for charging) are taken to obtain the target electric power limiting power F of the function adjustment, and then the target electric power limiting power F is integrated in the battery electric power adjustment module and compared with other function adjustment outputs G to output the final electric power limiting power H.

[0176] The overcurrent adjustment and the under-voltage adjustment are further explained in detail.

[0177] 1. Overcurrent adjustment algorithm structure of power battery

[0178] Since the overcurrent adjustment of the power battery is one of the functions for regulating the use power of the power battery, an additional function adjustment algorithm structure is added to the original structure, and the main structure is shown in Figure 6 and Figure 7 , please refer to Figure 7 , which shows the algorithm structure diagram of the PI adjustment current offset value of the battery overcurrent protection provided by an embodiment of the application, which includes two basic logical contents:

[0179] (1) Principle of overcurrent adjustment algorithm structure of battery electric power

[0180] The overcurrent adjustment of the battery electric power is to increase the adjustment of the use electric power capability on the basis of the basic limitation of the use power capability of the battery, and the result is taken as the extreme value (the minimum value for discharging function and the maximum value for charging power) to complete.

[0181] The overcurrent adjustment is calculated according to the important signals such as the final overall output electric power limiting feedback value, the overcurrent target, the demand electric power of the whole vehicle, the current voltage of the battery, etc. The specific process is as follows: first, the overcurrent target current is calculated by considering the feedback of the final limiting electric power under various internal conditions, and then the adjustment offset current is calculated according to the principle of PI by using the important signals such as the final output electric power feedback value, the overcurrent target current, the demand electric power of the whole vehicle, and the current voltage of the battery, etc. Then, the adjustment target allowable current is obtained by subtracting the adjustment offset current from the overcurrent target maximum current, and then the allowable limit use electric power of the battery overcurrent adjustment is obtained by multiplying the adjustment target allowable current by the current battery voltage. Finally, the allowable limit use electric power is taken as the extreme value with the allowable electric power of the whole vehicle battery electric power limiting module, so as to reduce the use electric power to actively avoid the power-off due to the overcurrent fault of the battery and affect the power safety of the whole vehicle when the use process is close to overcurrent.

[0182] (2) Principle of PI offset value algorithm structure of battery overcurrent adjustment

[0183] The PI offset value adjustment algorithm structure of the battery overcurrent adjustment is shown in Figure 7The shown. The adjustment algorithm first calculates the vehicle demand current by the whole vehicle demand electric power and the current voltage of the battery, and calculates the limiting power current by the feedback value of the allowed electric power and the current voltage of the battery. According to the difference between the overcurrent target current and the vehicle demand current, when it is greater than the judgment calibration threshold, no adjustment (Reset) is needed. At this time, the output current offset value is negative, so as to quickly improve the output electric power limiting ability. When the difference is less than the judgment calibration threshold, adjustment (set) is needed. The output is the target of the current value obtained by P adjustment and I adjustment of the difference between the overcurrent target current and the limiting power calculated current. The offset current value obtained by PI adjustment is used to quickly adjust the allowed use current of the battery, and then the allowed use electric power is obtained. Thus, once the overcurrent phenomenon occurs beyond the allowed electric power, the allowed use electric power is immediately reduced to play a protective role. In addition, the current difference is in the intermediate state between the Set and Reset conditions. In order to prevent the sudden change of the allowed use electric power, a lower offset value is used to restore the use ability of the electric power, so as to alleviate the adverse effects of the sharp change of the electric power ability on the actual performance of the vehicle power. Finally, in order to consider the smoothing effect (i.e. the smooth connection of the allowed use ability power) of the several adjustment output offset current values, the offset current value needs to be gradient limited and filtered under different working conditions.

[0184] 2. Battery under (over) voltage adjustment algorithm structure

[0185] Since the battery under (over) voltage adjustment is parallel to the overcurrent adjustment, the adjustment algorithm structure is also increased on the basis of the original. The main structure is as shown in Figure 6 under (over) voltage part and Figure 8 as shown in Figure 8 which shows the battery under-voltage protection PID adjustment current offset value algorithm structure provided by an embodiment of the application, which includes two aspects of content:

[0186] (1) Battery electric power under (over) voltage adjustment algorithm structure principle

[0187] The battery under (over) voltage regulation is to increase the use of electric power capacity for battery under (over) voltage regulation on the basis of the basic limitation of battery use power capacity, and the result is to take the extreme value of the original strategy result (the minimum value of discharge function, the maximum value of charging power) to complete. The regulation of under (over) voltage is calculated by important signals such as the final overall output electric power limit feedback value, under (over) voltage target, vehicle use demand electric power, current voltage, current and the lowest voltage of single cell. First, the under (over) voltage target maximum allowable current is calculated by the feedback final limit electric power and under voltage target voltage considering the output of each internal working condition, then the regulation offset current is calculated by the principle of PID according to the feedback final electric power, under (over) voltage target voltage, vehicle use demand electric power, current voltage, current and the lowest voltage of single cell. Then the under (over) voltage target maximum current is subtracted from the regulation offset current, and then multiplied by the under voltage target voltage, that is, the allowable limit use electric power of battery under (over) voltage regulation can be obtained. Finally, the allowable electric power of vehicle battery electric power limit module is taken as the extreme value, so as to achieve the safety of the use process once the under (over) voltage appears, which can immediately reduce the use of electric power to actively avoid the power-off due to battery under (over) voltage fault, and affect the safety of vehicle power.

[0188] (2) Battery under (over) voltage regulation PID offset value algorithm structure principle

[0189] The battery under (over) voltage regulation PID offset value regulation algorithm structure is as follows Figure 8The adjustment algorithm first calculates the whole vehicle demand current through the whole vehicle demand electric power and the current voltage of the battery, and then calculates the maximum allowed current of the under-voltage through the feedback value of the final electric power and the under-voltage target of the battery, and then compares the difference between the maximum allowed current of the under-voltage (over-voltage) and the whole vehicle demand current. When the difference is greater than the judgment calibration threshold, no adjustment is needed (one of the Reset conditions), at this time the output current offset value is negative, so as to quickly improve the output electric power limit ability. When the difference is less than the judgment calibration threshold, adjustment is needed (one of the Set conditions), then the output is the current offset value obtained by P adjustment, I adjustment and D adjustment according to the difference between the maximum current of the under-voltage (over-voltage) target and the current of the battery. The offset value adjusted by the PID quickly adjusts the allowed use electric power of the battery, so as to reduce the use electric power as soon as the under-voltage (over-voltage) phenomenon occurs, thereby playing a protection role. In addition, when the current difference is in the intermediate state between the Set and Reset conditions, a lower offset value is used to restore the use ability of the electric power to prevent sudden changes in the allowed use electric power, so as to achieve the effect of alleviating the sharp change of the electric power ability and the long recovery time of the power. Finally, in order to consider the smoothing effect of the offset current value of several adjustment outputs (i.e. the smooth connection of the electric power use ability), the offset current value needs to be gradient limited and filtered under different working conditions. In addition, considering that the battery BMS under-voltage (over-voltage) diagnosis generally uses the lowest voltage of the battery monomer to judge, therefore, when judging the set and reset conditions, the judgment condition of the lowest monomer voltage of the battery is added to fully envelop the diagnosis strategy of the BMS.

[0190] Based on the above Figure 6 The embodiment is shown in the following Figure 9 which shows the structure diagram of the algorithm main body for preventing battery overcharge and under-voltage provided by one embodiment of the application. Based on Figure 6 The structure diagram further includes a power over-discharge (charge) limiting module.

[0191] The power over-discharge (charge) adjustment algorithm is similar to the over-current structure of Figure 7 but in view of the timeliness influence of the electric power change gradient on the adjustment, the PID adjustment form is needed to be used to realize, which is as follows.

[0192] (3) Structure principle of battery over-power adjustment PID offset value algorithm (taking driving discharge as an example, the feedback direction is reversed)

[0193] The battery over-power adjustment PID offset value adjustment algorithm first compares the difference between the battery electric power capacity and the actual vehicle electric power, and when the difference is greater than the judgment calibration threshold, no adjustment is needed (one of the Reset conditions), at this time the output current offset value is negative to quickly increase the output electric power limit capacity, and when the difference is less than the judgment calibration threshold, adjustment is needed (one of the Set conditions), then the output is the power sum of the P item adjustment, I item adjustment and D item adjustment according to the electric power difference as the target, and the offset electric power adjusted by the PID adjustment is used to quickly adjust the allowed use electric power of the battery, so that as soon as the over-power phenomenon occurs, the use electric power is immediately reduced to play a protection role. In addition, when the power difference is in the intermediate state between the Set and Reset conditions, a lower offset value is used to restore the use capacity of the electric power to prevent the sudden change of the allowed use electric power, so as to alleviate the sharp change of the electric power capacity and the long recovery time of the power. Finally, in order to consider the smoothing effect of the several adjustment output offset power values (i.e. the smooth connection of the electric power use capacity), the offset power value needs to be gradient limited and filtered under different working conditions.

[0194] Please refer to Figure 10 , which shows a block diagram of an electric power adjustment device of a vehicle power battery provided by an example embodiment of the present application. The electric power adjustment device of the vehicle power battery can be implemented as all or part of the vehicle control unit by hardware or a combination of hardware and software, to implement all or part of the steps in the example embodiment as described above. As shown in Figure 2 to Figure 5 , the electric power adjustment device of the vehicle power battery includes: Figure 10

[0195] The first acquisition module 1001 is configured to acquire a first target current of a vehicle power battery, a vehicle demand power, a current voltage, a current current, a second target current, an under-voltage target voltage, an under-voltage voltage, an electric power capacity power, a single cell minimum voltage, and other function adjustment output electric power. The first target current is the maximum current allowed by the power battery, the second target current is the maximum current allowed by the power battery under the under-voltage voltage, the under-voltage target voltage is the under-voltage protection threshold of the power battery, the electric power capacity power is the maximum power that the power battery can output in a unit time, the single cell minimum voltage is the minimum voltage of the single cell battery in the power battery, and the other function adjustment output electric power is the adjustment electric power of other function systems in the vehicle except the adjustment electric power of the power battery;

[0196] The first limited electric power determination module 1002 is configured to determine a first limited electric power based on the first target current, the vehicle demand power, and the current voltage.

[0197] ​The second limited electric power determination module 1003 is configured to determine a second limited electric power based on the second target current, the current voltage, the under-voltage target voltage, the current, the whole vehicle demand power and the single cell minimum voltage.

[0198] The third limited electric power determination module 1004 is configured to determine a third limited electric power according to the working state of the power battery, the first limited electric power and the second limited electric power, the working state being one of a charging state and a discharging state.

[0199] The target limited electric power selection module 1005 is configured to select a target limited electric power from the third limited electric power and other function adjustment output electric powers.

[0200] In a possible implementation, the first limited electric power determination module 1002 is configured to:

[0201] The first limited electric power determination module 1002 is configured to calculate a first offset current by a PI algorithm according to the first target current, the whole vehicle demand power and the current voltage, the first offset current being a current value for adjusting the current when the power battery is in overcurrent.

[0202] The first limited electric power determination module 1002 is configured to determine a first adjustment target current according to the first target current and the first offset current.

[0203] The first limited electric power determination module 1002 is configured to obtain a product of the first adjustment target current and the current voltage as a first adjustment limited power.

[0204] The first limited electric power determination module 1002 is configured to obtain an extreme value of the first adjustment limited power and the electric power capacity power to obtain the first limited electric power.

[0205] In a possible implementation, the first limited electric power determination module 1002 is configured to:

[0206] The first limited electric power determination module 1002 is configured to calculate a first whole vehicle demand current according to the whole vehicle demand power and the current voltage.

[0207] The first limited electric power determination module 1002 is configured to calculate a limited power current according to the battery limited power and the current voltage.

[0208] The first limited electric power determination module 1002 is configured to, in a case where a difference between the first target current and the first whole vehicle demand current is less than a first calibration threshold, take a difference between the first target current and the limited power current as a target, and execute a current sum value of P adjustment and I adjustment as the first offset current.

[0209] In a possible implementation, the second limited electric power determination module 1003 is configured to:

[0210] The second bias current is calculated by a PID algorithm according to the second target current, the under-voltage target voltage, the whole vehicle demand power, the current voltage, the current and the single cell minimum voltage, and the second bias current is a current value for adjusting the current when the power battery is in under-voltage.

[0211] The second adjustment target current is determined according to the second target current and the second bias current.

[0212] The product of the second adjustment target current and the under-voltage voltage is obtained as the second adjustment limit power.

[0213] The extreme value of the second adjustment limit power and the electric power capacity power is obtained as the second limit electric power.

[0214] In a possible implementation, the second limit electric power determination module 1003,

[0215] The second whole vehicle demand current is calculated according to the whole vehicle demand power and the current voltage.

[0216] The under-voltage maximum allowable current is calculated according to the target limit electric power and the under-voltage target voltage.

[0217] In a case where the difference between the under-voltage maximum allowable current and the second whole vehicle demand current is less than the second calibration threshold, the difference between the maximum allowable current and the second whole vehicle demand current is taken as a target, and the current sum value of the P-term adjustment, the I-term adjustment and the D-term adjustment is taken as the second bias current.

[0218] In a possible implementation, the third limit electric power determination module 1004,

[0219] In a case where the power battery is in a charging state, the maximum value of the first limit electric power and the second limit electric power is obtained as the third limit electric power; or

[0220] In a case where the power battery is in a discharging state, the minimum value of the first limit electric power and the second limit electric power is obtained as the third limit electric power.

[0221] In a possible implementation, the apparatus further includes:

[0222] The second acquisition module is configured to acquire a third target current of a power battery of the vehicle and an actual electric power of the battery, the third target current being a maximum allowable current calculated by the HVSC module according to a whole vehicle power reservation strategy.

[0223] The fourth limit electric power determination module is configured to determine a fourth limit electric power based on the third target current, the electric power capacity power, the whole vehicle demand power and the actual electric power of the battery.

[0224] The third limited electric power determination module 1004 is configured to determine a third limited electric power according to the working state of the power battery, the first limited electric power, the second limited electric power and the fourth limited electric power.

[0225] Please refer to Figure 11 , Figure 11 is a structural schematic diagram of a computer device provided by an exemplary embodiment of the present application. The computer device 1100 includes a central processing unit (CPU) 1101, a system memory 1104 including a random access memory (RAM) 1102 and a read-only memory (ROM) 1103, and a system bus 1105 connecting the system memory 1104 and the central processing unit 1101. The computer device 1100 also includes a basic input / output system (I / O system) 1106 to help transfer information between various devices in the computer, and a mass storage device 1107 for storing an operating system 1113, application programs 1114 and other program modules 1115.

[0226] The basic input / output system 1106 includes a display 1108 for displaying information and an input device 1109 such as a mouse, a keyboard, etc. for user input. The display 1108 and the input device 1109 are both connected to the central processing unit 1101 through an input / output controller 1110 connected to the system bus 1105. The basic input / output system 1106 can also include an input / output controller 1110 for receiving and processing input from a keyboard, a mouse, or an electronic stylus, and other devices. Similarly, the input / output controller 1110 also provides output to a display screen, a printer, or other types of output devices.

[0227] The mass storage device 1107 is connected to the central processing unit 1101 through a mass storage controller (not shown) connected to the system bus 1105. The mass storage device 1107 and its associated computer readable medium provide non-volatile storage for the computer device 1100. That is, the mass storage device 1107 can include a computer readable medium (not shown) such as a hard disk or a CD-ROM (Compact Disc Read-Only Memory) drive.

[0228] Without loss of generality, the computer readable medium can include computer storage media and communication media. Computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EPROM, EEPROM, flash memory or other solid state memory technology, CD-ROM, digital video disc (DVD), or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices. Of course, those skilled in the art will recognize that computer storage media is not limited to the foregoing examples. The system memory 1104 and the mass storage device 1107 described above can be collectively referred to as memory.

[0229] The computer device 1100 can be connected to the Internet or other network devices through the network interface unit 1111 connected to the system bus 1105.

[0230] The memory further includes one or more programs, and the one or more programs are stored in the memory, and the central processing unit 1101 implements all or part of the steps of the method shown in the embodiments by executing the one or more programs. Figure 2 to Figure 5

[0231] In the exemplary embodiments, a chip is also provided, which includes programmable logic circuit and / or program instructions, and when the chip is running on the computer device, is used to implement all or part of the steps of the method shown in the embodiments of the present application.

[0232] In the exemplary embodiments, a computer program product is also provided, which includes computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and the processor reads and executes the computer instructions from the computer readable storage medium to implement all or part of the steps of the method shown in the embodiments of the present application.

[0233] ​In the example embodiments, a computer readable storage medium is also provided, and the computer readable storage medium stores a computer program, which is loaded and executed by a processor to implement all or part of the steps of the method shown in the above embodiments.

[0234] A person of ordinary skill in the art can understand that all or part of the steps of the above embodiments can be completed by hardware, or by program instructing related hardware, and the program can be stored in a computer readable storage medium, and the storage medium can be a read-only memory, a magnetic disk or an optical disk, etc.

[0235] Those skilled in the art should realize that, in one or more examples described above, the functions described in the embodiments of the present application can be implemented by hardware, software, firmware or any combination thereof. When implemented by software, the functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes a computer storage medium and a communication medium, and the communication medium includes any medium that facilitates the transfer of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0236] The above description is only optional embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for regulating the electrical power of a vehicle's power battery, characterized in that, The method is executed by the vehicle control unit, and the method includes: The system acquires the vehicle's power battery's first target current, overall vehicle power requirement, current voltage, current, second target current, undervoltage target voltage, undervoltage voltage, power capability, minimum cell voltage, and other functional regulation output power. The first target current is the maximum allowable current of the power battery, the second target current is the maximum allowable current of the power battery when it is undervoltage, the undervoltage target voltage is the undervoltage protection threshold of the power battery, the power capability is the maximum power that the power battery can output per unit time, the minimum cell voltage is the minimum voltage of a single cell in the power battery, and the other functional regulation output power is the regulation power of other functional systems in the vehicle besides the regulation power of the power battery. Based on the first target current, the vehicle's required power, and the current voltage, a first power limit is determined; The second limiting power is determined based on the second target current, the current voltage, the undervoltage target voltage, the current current, the vehicle power requirement, and the minimum voltage of the individual unit. The third limiting power is determined based on the operating state of the power battery, the first limiting power, and the second limiting power, wherein the operating state is one of charging state and discharging state. The target limiting power is selected from the third limiting power and the other functionally regulated output power.

2. The method according to claim 1, characterized in that, The step of determining the first power limit based on the first target current, the vehicle's required power, and the current voltage includes: Based on the first target current, the required power of the vehicle, and the current voltage, the first deflection current is calculated using a PI algorithm. The first deflection current is the current value used to adjust the current when the power battery is in an overcurrent state. The first adjustment target current is determined based on the first target current and the first deflection current; The product of the first target current and the current voltage is obtained as the first regulation limit power; The extreme value between the first adjustable limit power and the power capability is obtained to obtain the first limited power.

3. The method according to claim 2, characterized in that, The step of calculating the first bias reduction current using a PI algorithm based on the first target current, the vehicle's required power, and the current voltage includes: The first vehicle demand current is calculated based on the vehicle's required power and the current voltage. The power limit current is calculated based on the battery power limit and the current voltage. If the difference between the first target current and the first vehicle demand current is less than the first calibration threshold, the difference between the first target current and the limiting power current is taken as the target, and the sum of the currents of the P-term adjustment and the I-term adjustment is taken as the first bias reduction current.

4. The method according to claim 1, characterized in that, The determination of the second power limit based on the second target current, the current voltage, the undervoltage target voltage, the current current, the vehicle's required power, and the minimum voltage of the individual unit includes: Based on the second target current, the undervoltage target voltage, the vehicle power requirement, the current voltage, the current current, and the minimum voltage of the single cell, a second deflection current is calculated using a PID algorithm. The second deflection current is the current value used to adjust the current when the power battery is undervoltage. The second adjustment target current is determined based on the second target current and the second deflection current; The product of the second target current and the undervoltage is obtained as the second regulation limit power; The extreme value between the second adjustable limit power and the power capability is obtained to obtain the second limited power.

5. The method according to claim 4, characterized in that, The step of calculating the second bias reduction current using a PID algorithm based on the second target current, the undervoltage target voltage, the vehicle power requirement, the current voltage, the current current, and the minimum voltage of the individual unit includes: The second vehicle current requirement is calculated based on the vehicle's required power and the current voltage. The maximum allowable undervoltage current is calculated based on the target power limit and the undervoltage target voltage. If the difference between the maximum allowable undervoltage current and the second vehicle demand current is less than the second calibration threshold, the difference between the maximum allowable current and the second vehicle demand current is used as the target, and the sum of the currents of the P-term adjustment, I-term adjustment and D-term adjustment is used as the second bias reduction current.

6. The method according to any one of claims 1 to 5, characterized in that, The step of determining the third limiting power based on the operating state of the power battery, the first limiting power, and the second limiting power includes: When the power battery is in a charging state, the maximum value between the first limited power and the second limited power is obtained and determined as the third limited power; or, When the power battery is in a discharging state, the minimum value between the first limiting power and the second limiting power is obtained and determined as the third limiting power.

7. The method according to any one of claims 1 to 5, characterized in that, The method further includes: The third target current and actual power of the vehicle's power battery are obtained. The third target current is the maximum allowable current calculated by the HVSC module based on the vehicle power reservation strategy. Based on the third target current, the power capacity, the vehicle power requirement, and the actual battery power, a fourth limiting power is determined. The step of determining the third limiting power based on the operating state of the power battery, the first limiting power, and the second limiting power includes: The third limiting power is determined based on the operating state of the power battery, the first limiting power, the second limiting power, and the fourth limiting power.

8. A computer device, characterized in that, The computer device includes a processor and a memory, the memory storing instructions which are executed by the processor to implement the power regulation method for the vehicle's power battery as described in any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that, The storage medium stores instructions that are executed by a processor of a computer device to implement the power regulation method for the vehicle's power battery as described in any one of claims 1 to 5.

10. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium; the computer instructions are read and executed by a processor of a computer device to implement the power regulation method for the vehicle's power battery as described in any one of claims 1 to 5.

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