Vehicle battery power adjusting method and device and vehicle

Abstract

The invention provides a vehicle battery power adjusting method and device and a vehicle, the method is applied to the field of vehicles, and the method comprises the steps that in response to a power upper limit switching request for a power battery of the vehicle, battery state parameters of the power battery are obtained; the power upper limit switching request is used for adjusting the upper limit of the output power of the power battery; determining a first target power upper limit of the power battery based on the battery state parameter and a first threshold, wherein the first threshold is used for constraining the adjustment amplitude of the upper limit of the output power of the power battery; and switching the upper limit of the output power of the power battery to the first target power upper limit under the condition that the upper limit of the output power of the power battery is not switched and the first target power upper limit meets the power demand of the vehicle. According to the method, when the electric quantity of the power battery is small and the output power upper limit of the power battery is switched, the output power of the power battery can be switched to the first target power upper limit, so that the power requirement of the vehicle is met.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more specifically, to a method and device for adjusting vehicle battery power and a vehicle in the field of vehicles. Background Art

[0002] Power batteries are the source of power for new energy vehicles, and their charge and discharge performance is affected by the battery's condition. If a power battery is discharged for an extended period, its temperature will rise. To prevent damage from overheating, the battery's maximum output power is adjusted.

[0003] In related technologies, to prevent damage from overheating, the maximum output power of the power battery is adjusted to a lower output power. However, in actual applications, the lower available power may be too small, and the lower output power may not be able to meet the vehicle's higher power requirements. If the vehicle needs to accelerate and the maximum output power of the power battery is low, the vehicle's speed will not increase even if the user steps on the accelerator pedal. In this case, the adjusted output power will not meet the vehicle's power requirements, resulting in a poor user experience. Summary of the Invention

[0004] The present application provides a method, device and vehicle for adjusting vehicle battery power. The method can switch the output power of the power battery to a first target power upper limit when the power battery has a low power level and the output power upper limit of the power battery is switched to meet the power requirements of the vehicle.

[0005] In a first aspect, a method for adjusting vehicle battery power is provided, the method comprising:

[0006] acquiring a battery state parameter of the power battery in response to a power upper limit switching request for a power battery of the vehicle, the power upper limit switching request being used to adjust an upper limit of an output power of the power battery;

[0007] determining a first target power upper limit of the power battery based on the battery state parameter and a first threshold, wherein the first threshold is used to constrain an adjustment range of an upper limit of an output power of the power battery;

[0008] When the upper limit of the output power of the power battery has not been switched and the first target upper limit power meets the power demand of the vehicle, the upper limit of the output power of the power battery is switched to the first target upper limit power.

[0009] Through the above method, the battery status parameters of the power battery can be obtained based on the power upper limit switching request of the vehicle's power battery; the power upper limit switching request is used to adjust the upper limit of the output power of the power battery. If the vehicle has a power demand for acceleration, in order to prevent the power upper limit of the power battery after the power upper limit is switched from possibly failing to meet the power demand of the vehicle, the first target power upper limit of the power battery is determined based on the battery status parameters and the first threshold value. When the output power of the power battery has not completed the switching and the first target power upper limit meets the power demand of the vehicle, the upper limit of the output power of the power battery is adjusted upward to the first target power upper limit. Since the first threshold value can constrain the adjustment range of the upper limit of the output power of the power battery, the first target power upper limit not only meets the power demand of the vehicle but also avoids the problem of undervoltage of the power battery.

[0010] In conjunction with the first aspect, in certain possible implementations, the battery status parameters include peak discharge power, continuous discharge power, and minimum cell voltage, and determining the first target power upper limit of the power battery based on the battery status parameters and a first threshold value includes:

[0011] determining a first deviation value between the peak discharge power and the continuous discharge power;

[0012] determining a first reference power deviation of the power battery based on the first deviation value and the first threshold value; the first threshold value is used to represent the degree of deviation between the minimum cell voltage and a first preset voltage, and the first preset voltage is used to determine whether the power battery is undervoltage;

[0013] The first target power upper limit is determined based on the sum of the continuous discharge power and the first reference power deviation.

[0014] Through the above method, the first target power upper limit can be determined based on the peak discharge power, the continuous discharge power and the first threshold, thereby limiting the output power upper limit of the power battery to avoid undervoltage of the power battery.

[0015] In conjunction with the first aspect, in some possible implementations, the method further includes:

[0016] If the upper limit of the output power of the power battery has not been switched and the first target upper limit power does not meet the power demand of the vehicle, switching the upper limit of the output power of the power battery to a second target upper limit power; the second target upper limit power is greater than the first target upper limit power;

[0017] When the upper limit of the output power of the power battery is switched, it is determined to switch the upper limit of the output power of the power battery to a third target power upper limit; the third target power upper limit is smaller than the first target power upper limit.

[0018] Through the above method, different output power upper limits can be determined according to different power requirements of the vehicle, thereby avoiding undervoltage of the power battery while still meeting the power requirements of the vehicle.

[0019] In conjunction with the first aspect, in certain possible implementations, the battery status parameter includes a minimum cell voltage. When the upper limit of the output power of the power battery has not been switched and the first target power upper limit meets the power demand of the vehicle, before the upper limit of the output power of the power battery is switched to the first target power upper limit, the steps include:

[0020] Obtaining a plurality of minimum cell voltages and driving parameters of the vehicle;

[0021] determining whether the upper limit of the output power has completed switching based on a plurality of minimum cell voltages;

[0022] It is determined whether the first target upper power limit meets the power requirement of the vehicle based on the driving parameter.

[0023] Through the above method, it is possible to determine whether the first target power upper limit meets the power requirements of the vehicle based on the minimum cell voltage and driving parameters, thereby adjusting the output power upper limit to bring a better experience to users.

[0024] In conjunction with the first aspect, in some possible implementations, determining whether the upper limit of the output power has completed switching based on the multiple minimum cell voltages includes:

[0025] If the difference between the first minimum cell voltage and the second minimum cell voltage is greater than a second preset voltage, it is determined that the upper limit of the output power of the power battery has not been switched; the first minimum cell voltage is the minimum cell voltage collected when the upper limit of the output power of the power battery is currently calculated; and the second minimum cell voltage is the minimum cell voltage collected when the upper limit of the output power of the power battery was previously calculated;

[0026] When the difference between the first minimum cell voltage and the second minimum cell voltage is less than a second preset voltage, determining the upper limit of the output power of the power battery to complete the switching;

[0027] The driving parameters include a vehicle speed and an accelerator pedal opening of the vehicle. Determining whether the first target upper power limit meets a power requirement of the vehicle based on the driving parameters includes:

[0028] Determining that the first target power upper limit meets the power demand of the vehicle is performed when the difference between the first vehicle speed and the second vehicle speed is greater than a first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is greater than the first preset opening; the first vehicle speed is the vehicle speed collected when the upper limit of the power battery output power is currently calculated; the second vehicle speed is the vehicle speed collected when the upper limit of the power battery output power was previously calculated; the first accelerator pedal opening is the accelerator pedal opening collected when the upper limit of the power battery output power is currently calculated; and the second accelerator pedal opening is the accelerator pedal opening collected when the upper limit of the power battery output power was previously calculated;

[0029] When the difference between the first vehicle speed and the second vehicle speed is less than the first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is less than the first preset opening, it is determined that the first target power upper limit meets the power demand of the vehicle.

[0030] Through the above method, it is possible to determine whether the first target power upper limit meets the power requirements of the vehicle based on the minimum cell voltage and driving parameters, thereby adjusting the output power upper limit to bring a better experience to users.

[0031] In conjunction with the first aspect, in certain possible implementations, the battery state parameter includes peak discharge power and continuous discharge power, and switching the upper limit of the output power of the power battery to the second target power upper limit includes:

[0032] determining a first deviation value between the peak discharge power and the continuous discharge power;

[0033] Determining a second reference power deviation of the battery based on a product of the first deviation value and a second threshold value, wherein the second threshold value is greater than the first threshold value;

[0034] determining the second target power upper limit based on the sum of the continuous discharge power and the second reference power deviation;

[0035] The upper limit of the output power of the power battery is switched to the second target power upper limit.

[0036] Through the above method, the output power upper limit of the power battery is determined based on the peak discharge power, the continuous discharge power and the second threshold value to meet the power demand of the vehicle.

[0037] In conjunction with the first aspect, in certain possible implementations, the battery state parameter includes peak discharge power and continuous discharge power, and determining before switching the upper limit of the output power of the power battery to the third target power upper limit includes:

[0038] When the upper limit of the output power of the power battery is switched, the third target power upper limit is determined based on the first target power upper limit or the second target power upper limit.

[0039] Through the above method, the third target power upper limit can be determined based on the first target power upper limit or the second target power upper limit, thereby avoiding undervoltage of the power battery.

[0040] In conjunction with the first aspect, in certain possible implementations, when the upper limit of the output power of the power battery is switched, determining the third target power upper limit based on the first target power upper limit or the second target power upper limit includes:

[0041] When the upper limit of the output power of the power battery is switched and the upper limit of the output power after the switching is the first target power upper limit, subtracting the product of the third threshold and the first deviation value from the first target power upper limit to obtain the third target power upper limit;

[0042] When the upper limit of the output power of the power battery is switched and the upper limit of the output power after switching is the second target power upper limit, the product of the fourth threshold and the first deviation value is subtracted from the second target power upper limit to obtain the third target power upper limit.

[0043] Through the above method, the third target power upper limit can be determined based on the first target power upper limit or the second target power upper limit, thereby avoiding undervoltage of the power battery.

[0044] In a second aspect, a vehicle battery power adjustment device is provided, the device comprising:

[0045] an acquisition module, configured to acquire a battery status parameter of a power battery of a vehicle in response to a power upper limit switching request for the power battery of the vehicle; the power upper limit switching request is used to adjust an upper limit of an output power of the power battery;

[0046] a determination module, configured to determine a first target power upper limit of the power battery based on the battery state parameter and a first threshold;

[0047] The switching module is configured to switch the upper limit of the output power of the power battery to the first target power upper limit when the upper limit of the output power of the power battery has not been switched and the first target power upper limit meets the power demand of the vehicle.

[0048] In a third aspect, a vehicle is provided, comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to call and run the executable program code from the memory, so that the vehicle executes the method executed by the above-mentioned vehicle battery power adjustment method.

[0049] In a fourth aspect, a computer program product is provided, which includes: a computer program code, which, when executed on a computer, enables the computer to execute the method executed by the above-mentioned vehicle battery power adjustment method.

[0050] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method executed by the above-mentioned vehicle battery power adjustment method. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of an implementation environment of a vehicle battery power adjustment method provided in an embodiment of the present application;

[0052] Figure 2 is a schematic flow chart of a vehicle battery power adjustment method provided in an embodiment of the present application;

[0053] Figure 3 is a schematic flow chart of another vehicle battery power adjustment method provided in an embodiment of the present application;

[0054] Figure 4 This is a schematic structural diagram of a vehicle battery power adjustment device provided in an embodiment of the present application;

[0055] Figure 5 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more than two.

[0057] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0058] When the vehicle is driving, the power battery provides power for the vehicle. However, the power battery will generate heat when outputting power to the outside for a long time. In order to prevent the power battery from overheating and causing damage, the output power of the power battery needs to be adjusted. That is, the upper limit of the power battery's output power is adjusted to a smaller output power upper limit. However, in actual applications, the smaller output power may be relatively small, and thus cannot meet the vehicle's greater power requirements. If the vehicle has a power demand for acceleration (acceleration requires a larger output power), and the output power upper limit of the power battery is relatively small, even if the user steps on the accelerator pedal, the vehicle's speed will not increase, then the adjusted output power cannot meet the vehicle's power requirements, which means it brings a poor experience to the user. Based on the above problems, an embodiment of the present application provides a method for adjusting the battery power of a vehicle, which can obtain the battery status parameters of the power battery based on the power upper limit switching request of the vehicle's power battery; the power upper limit switching request is used to adjust the upper limit of the output power of the power battery. If the vehicle has an acceleration power demand, in order to prevent the power upper limit of the power battery after the power upper limit is switched from possibly failing to meet the power demand of the vehicle, the first target power upper limit of the power battery is determined based on the battery status parameters and the first threshold value. When the output power of the power battery has not completed the switching and the first target power upper limit meets the power demand of the vehicle, the upper limit of the output power of the power battery is adjusted upward to the first target power upper limit. Since the first threshold value can constrain the adjustment range of the upper limit of the output power of the power battery, the first target power upper limit not only meets the power demand of the vehicle but also avoids the problem of undervoltage of the power battery.

[0059] Figure 1 This is a schematic diagram of the implementation environment of a vehicle battery power adjustment method provided in an embodiment of the present application.

[0060] For example, Figure 1 As shown, the implementation environment includes a vehicle control unit (VCU) 110 and a battery management system (BMS) 120 .

[0061] The vehicle controller 110 is an important control unit of the vehicle. It can obtain relevant data of the vehicle and control the vehicle to perform corresponding operations based on the relevant data. For example, in a hybrid vehicle or a new energy vehicle, the vehicle controller 110 obtains the power demand of the vehicle and controls the vehicle's battery management system 120 to adjust the output power of the vehicle battery based on the power demand.

[0062] The battery management system 120 monitors the battery's voltage, current, temperature and other parameters in real time, and controls the battery's charge and discharge power based on these parameters to ensure that the battery operates within a safe voltage and current range, preventing the battery from overcharging, over-discharging and overheating.

[0063] Figure 2 This is a schematic flowchart of a vehicle battery power adjustment method provided in an embodiment of the present application.

[0064] For example, Figure 2 As shown, taking the execution subject as the vehicle controller as an example, a vehicle battery power adjustment method of the present application is described, and the method 200 includes the following steps 201-203.

[0065] Step 201 : In response to a power upper limit switching request for a power battery of a vehicle, a battery status parameter of the power battery is obtained.

[0066] It should be understood that the power of a power battery refers to the amount of energy it outputs per unit time. In practical applications, during the discharge process of a vehicle's power battery, the temperature of the power battery rises. Excessively high temperatures can shorten the battery's service life. Generally speaking, the greater the discharge power of a power battery, the faster the temperature rises. Therefore, to protect the power battery, a power cap is configured to limit the maximum output power of the power battery, thereby reducing the rate of temperature rise. However, if the power battery's current power cap remains the same as the power cap when the power battery temperature is lower, the power battery will discharge at a higher power, causing the power battery temperature to rise continuously. The continued high temperature within the power battery accelerates chemical reactions within the battery, gradually reducing the voltage within the power battery. When the voltage within the power battery drops to a first preset voltage, an undervoltage condition occurs in the power battery, shortening the power battery's service life. Therefore, it is necessary to limit the power cap of the power battery, i.e., to respond to a power cap switching request for the vehicle's power battery.

[0067] Among them, the power upper limit switching request is used to adjust the upper limit of the output power of the power battery. The battery status parameters include the minimum single cell voltage, peak discharge power and continuous discharge power of the battery. The power battery is a battery pack, which includes multiple single cells. The minimum single cell voltage of the power battery is used to indicate the voltage performance of the power battery. The peak discharge power is used to enable the power battery to output higher torque to meet the greater power requirements of the vehicle. It can be understood that the peak discharge power is instantaneous high power and is maintained for a short time. The continuous discharge power is used to provide stable power output for the vehicle.

[0068] Step 202 : determining a first target upper power limit of the power battery based on the battery state parameter and a first threshold value, where the first threshold value is used to constrain an adjustment range of an upper limit of the output power of the power battery.

[0069] It should be understood that the power of the power battery is switched based on the power upper limit switching request of the power battery, the temperature of the battery and the state of charge. In actual applications, when the output power of the battery is greater than the power upper limit, in order to protect the performance of the battery, the vehicle controller will switch the power upper limit of the power battery from the peak discharge power to the continuous discharge power. However, in actual applications, since the continuous discharge power is the power upper limit that can provide stable output for the vehicle for a long time, the continuous discharge power output is low, and the peak discharge power is an instantaneous high power, the continuous discharge power provides power output for the vehicle to travel smoothly, while the peak discharge power provides power output for the vehicle to accelerate or start. In the case where the power upper limit of the power battery is switched from the peak discharge power to the continuous discharge power, if the vehicle has a power demand for acceleration, the continuous discharge power may not be able to meet the acceleration demand of the vehicle. Therefore, it is necessary to determine the first target power upper limit of the power battery based on the battery status parameter and the first threshold.

[0070] Among them, the first threshold value can constrain the adjustment range of the upper limit of the output power of the power battery and the first threshold value is used to characterize the degree of deviation between the minimum cell voltage and the first preset voltage. The first preset voltage is used to indicate whether the power battery is undervoltage. For example, if the power battery has less power and the upper limit adjustment range of the power battery's output power is large, it will cause the power battery to over-discharge and easily cause the power battery to be undervoltage. The first target power upper limit is the power upper limit that can meet the power requirements of the vehicle. The power battery has an operating voltage range. If the power battery voltage is lower than the normal operating voltage range and the power battery is still in the discharge process, it means that the power battery is in an undervoltage state. If the power battery is in an undervoltage state for a long time, it will cause the motor material inside the power battery to decompose, peel off or corrode, thereby seriously affecting the service life of the power battery. That is, long-term undervoltage of the power battery will seriously reduce the service life of the power battery.

[0071] Step 203 : If the upper limit of the output power of the power battery has not been switched and the first target upper limit power meets the power demand of the vehicle, switch the upper limit of the output power of the power battery to the first target upper limit power.

[0072] It should be understood that the incomplete switching of the power battery's output power indicates that the upper limit of the power battery's output power has not yet been lowered. The continuous discharge power is relatively low, and the first target power upper limit is relatively high. To prevent the continuous discharge power from failing to meet the vehicle's power requirements, the power battery's output power upper limit is switched to the first target power upper limit to meet the vehicle's power requirements.

[0073] An embodiment of the present application provides a method for adjusting vehicle battery power, which can obtain battery status parameters of a power battery based on a power upper limit switching request of the vehicle's power battery; the power upper limit switching request is used to adjust the upper limit of the output power of the power battery. If the vehicle has a power demand for acceleration, in order to prevent the power upper limit of the power battery after the power upper limit is switched from possibly failing to meet the power demand of the vehicle, the first target power upper limit of the power battery is determined based on the battery status parameters and a first threshold value. When the output power of the power battery has not completed the switching and the first target power upper limit meets the power demand of the vehicle, the upper limit of the output power of the power battery is adjusted upward to the first target power upper limit. Since the first threshold value can constrain the adjustment range of the upper limit of the output power of the power battery, the first target power upper limit not only meets the power demand of the vehicle but also can avoid the problem of over-discharge or undervoltage of the power battery.

[0074] Figure 3 This is a schematic flowchart of another method for adjusting vehicle battery power according to an embodiment of the present application.

[0075] It should be noted that the above steps 201-203 are a simple description of a vehicle battery power adjustment method provided in an embodiment of the present application. The following will provide a more detailed description of a vehicle battery power adjustment method provided in an embodiment of the present application with reference to some examples. Figure 3 Taking the execution subject as the vehicle controller as an example, the method includes the following steps 301 to 307.

[0076] Step 301 : In response to a power upper limit switching request for a power battery of a vehicle, a peak discharge power, a continuous discharge power, and a plurality of minimum cell voltages of the power battery are obtained.

[0077] The power upper limit switching request is used to adjust the upper limit of the output power of the power battery.

[0078] It should be understood that during power battery discharge, the battery's temperature rises. Excessively high temperatures can shorten the battery's service life. Therefore, an upper limit on the power battery's output power is set during discharge to limit the battery's maximum output power. However, as the power battery's temperature rises, the upper limit on the power battery's power is switched to prevent over-discharge. This is in response to a request to switch the vehicle's power battery's power upper limit.

[0079] In a possible implementation, the peak discharge power and the continuous discharge power of the power battery are acquired based on the current state of charge (SOC) of the power battery and the current temperature of the power battery.

[0080] Among them, SOC is used to indicate the available state of the remaining charge in the power battery. Peak discharge power is used to make the power battery output higher torque to meet the vehicle's greater power requirements. Peak discharge power is instantaneous high power and is maintained for a short time. Peak discharge power is used in scenarios that require instantaneous high power output, such as vehicle acceleration and starting. Continuous discharge power is used to provide stable power output for the vehicle. Continuous discharge power is continuous and stable power and is maintained for a longer time. Continuous discharge power is used in scenarios that require continuous and stable power output, such as constant speed driving of the vehicle.

[0081] In some embodiments, the peak discharge power and the continuous discharge power of the power battery are determined based on the SOC of the power battery, the current temperature, and a mapping table between the SOC and the power of the power battery.

[0082] For example, when the SOC of the power battery is between 40% and 60% and the current temperature of the power battery is between 0° C. and 25° C., the peak discharge power of the power battery is 80 kilowatts (kW).

[0083] For another example, when the SOC of the power battery is between 40% and 60% and the current temperature of the power battery is between 0° C. and 25° C., the continuous discharge power of the power battery is 40 kilowatts (kW).

[0084] In this embodiment, the peak discharge power and continuous discharge power of the power battery are obtained based on the SOC of the power battery and the current temperature of the power battery. That is, the maximum output power of the power battery is limited at various temperatures of the power battery, thereby avoiding over-discharge or overheating of the power battery.

[0085] In a possible implementation, the minimum cell voltage of the power battery is acquired each time the upper limit of the output power of the power battery is switched.

[0086] Among them, the minimum single cell voltage of the power battery is used to limit the available capacity of the power battery.

[0087] It should be understood that a power battery pack consists of multiple cells connected in series, and the overall discharge capacity of the power battery is limited by the cell with the lowest voltage. For example, when the voltage of cell 1 in a power battery has reached the discharge cutoff voltage, the voltages of the other cells in the power battery may still have residual capacity. In this case, if the power battery continues to discharge, while the other cells will not suffer from over-discharge, cell 1 may suffer from over-discharge or under-voltage. Therefore, the available capacity of the power battery is limited by the minimum cell voltage.

[0088] It should also be understood that when a power battery is discharged at peak discharge power, polarization will occur within the power battery. When the power upper limit of the power battery is at peak discharge power, the current within the power battery is large. The large current causes the instantaneous voltage drop of the power battery's internal resistance to increase. The electrolyte ions in the power battery migrate rapidly on the electrode surface, resulting in an increase in the ion concentration gradient near the electrode. The electrode reaction rate cannot keep up with the current demand, resulting in charge accumulation. When the power upper limit of the power battery switches from peak discharge power to continuous discharge power, the output power of the power battery decreases, the current of the power battery decreases, the chemical reaction rate and ion diffusion within the power battery gradually return to equilibrium, the concentration polarization and electrochemical polarization partially subside, the internal voltage drop of the battery decreases, and the battery terminal voltage rebounds accordingly. In other words, voltage rebound occurs. The battery terminal voltage is the electromotive force (E) minus the product of the current (I) and the battery internal resistance (R).

[0089] To determine the available capacity of the battery, the minimum cell voltage of the power battery is collected each time the upper limit of the power battery output power is switched.

[0090] In this embodiment, the minimum cell voltage of the power battery is collected each time the upper limit of the power battery output power is switched, thereby monitoring the available capacity of the power battery each time the upper limit of the power battery output power is switched.

[0091] Optionally, before executing the above step 301, the following steps may also be executed.

[0092] It should be understood that as the cumulative battery discharge increases, the power battery voltage may decrease. To protect the performance of the power battery, when the cumulative battery discharge is high, the vehicle controller will limit the power battery discharge power.

[0093] In one possible implementation, whether to respond to the power upper limit switching request for the power battery is determined based on the accumulated discharge capacity of the power battery.

[0094] The cumulative discharge capacity of the battery is the sum of the discharge capacity of the power battery during multiple discharges after it is fully charged.

[0095] In some embodiments, when the cumulative discharge capacity of the battery of the vehicle is greater than a first preset capacity, a response to a power upper limit switching request for the power battery is determined, that is, determining to switch the power upper limit of the power battery from peak discharge power to short-time discharge power.

[0096] Among them, the first preset power is automatically determined by the vehicle controller, and the embodiment of the present application is not limited to this.

[0097] Peak discharge power is greater than short-time discharge power, which is greater than continuous discharge power. Short-time discharge power is the power that a power battery can output in a short period of time.

[0098] It should be understood that to prevent over-discharge of the power battery, the battery management system will reduce the maximum output power of the power battery based on the power battery's charge level. In actual applications, the maximum output power of the power battery changes in a gradient. When the battery management system switches the power limit based on the power battery's state of charge and temperature, it first switches the power limit of the power battery to the peak discharge power, then to the short-term discharge power, and finally to the continuous discharge power. The short-term discharge power is between the peak discharge power and the continuous discharge power.

[0099] In some embodiments, when the cumulative discharge capacity of the battery of the vehicle is greater than a second preset capacity, a response is determined to the power upper limit switching request for the power battery, that is, determining to switch the power upper limit of the power battery from the short-time discharge power to the continuous discharge power.

[0100] The second preset power level is greater than the first preset power level.

[0101] The second preset power is automatically determined by the vehicle controller, and the embodiment of the present application is not limited to this.

[0102] In some embodiments, when the accumulated discharge capacity of the battery is less than or equal to a first preset capacity, it is determined not to respond to the power upper limit switching request of the power battery.

[0103] It should be understood that the discharge capacity of the power battery is less than or equal to the first preset power, which means that the discharge capacity of the power battery is small. Therefore, the current state of charge and current temperature of the battery will not affect the safety of the power battery. Therefore, it is determined not to respond to the power upper limit request of the power battery.

[0104] In this embodiment, whether to respond to the power upper limit switching request of the power battery is determined based on the cumulative discharge amount of the battery, thereby monitoring whether the power battery will be over-discharged through the cumulative discharge amount of the battery, thereby avoiding the problem of over-discharge of the power battery.

[0105] Step 302 : determining a first target power upper limit of the power battery based on the peak discharge power, the continuous discharge power, and a first threshold.

[0106] The first threshold is used to characterize the degree of deviation between the minimum cell voltage and the first preset voltage. The first preset voltage is used to determine whether the power battery is undervoltage, and the first threshold is used to constrain the adjustment range of the upper limit of the power battery's output power.

[0107] In one possible implementation, a first deviation value between the peak discharge power and the continuous discharge power is determined; a first reference power deviation of the power battery is determined based on the product of the first deviation value and the first threshold; and the first target power upper limit is determined based on the sum of the continuous discharge power and the first reference power deviation.

[0108] It should be understood that since the current power of the power battery cannot meet the peak discharge power requirement and the continuous discharge power cannot meet the power requirement of the vehicle, an intermediate value can be determined based on the peak discharge power and the continuous discharge power to meet the power requirement of the vehicle, and the power battery will not be over-discharged.

[0109] In this embodiment, the first target power upper limit can be determined based on the peak discharge power, the continuous discharge power and the first threshold, thereby limiting the output power upper limit of the power battery to avoid over-discharge of the power battery.

[0110] In order to explain the above embodiment in more detail, the above embodiment will be explained in several parts below.

[0111] The first part describes the content of determining the first deviation value between the peak discharge power and the continuous discharge power.

[0112] In some embodiments, the peak discharge power is subtracted from the continuous discharge power to obtain the first deviation value.

[0113] It should be understood that since the peak discharge power is greater than the continuous discharge power, the first deviation value is obtained by subtracting the continuous discharge power from the peak discharge power.

[0114] The second part describes the content of determining the first reference power deviation of the power battery based on the product of the first deviation value and the first threshold.

[0115] In some embodiments, the first preset voltage is subtracted from the minimum cell voltage to obtain the second deviation value; and the first threshold value is determined based on a correspondence table between the second deviation value and the first threshold value.

[0116] It should be understood that in actual applications, if the minimum cell voltage is less than the first preset voltage, the power battery is determined to be undervoltage. Therefore, to avoid power battery undervoltage, a first threshold is determined based on the deviation between the minimum cell voltage and the first preset voltage to prevent the power battery's upper power limit from being too high. That is, the smaller the second deviation value, the smaller the first threshold value; the larger the second deviation value, the larger the first threshold value. A smaller second deviation value indicates that the minimum cell voltage is close to the first preset voltage, which increases the probability of the power battery over-discharge. Therefore, the smaller the first threshold value is determined, and the lower the first target power limit determined based on the first threshold value. A larger second deviation value indicates that the minimum cell voltage is far from the first preset voltage, which reduces the probability of the power battery over-discharge. Therefore, the larger the first threshold value is determined, and the higher the first target power limit determined based on the first threshold value.

[0117] For example, if the second deviation value is 10V, the first threshold value is 1 / 6; if the second deviation value is 30V, the first threshold value is 1 / 3.

[0118] It should be understood that in actual applications, since the continuous discharge power is the minimum discharge power of the power battery at its current state of charge, the continuous discharge power can be adjusted upward to obtain the first target power upper limit. The magnitude of the adjustment to the power battery's output power upper limit is determined based on the product of the first deviation value and the first threshold value, that is, the first reference power deviation is determined.

[0119] For example, the first deviation value is 60 kW, the first threshold is 1 / 3, and the first reference power deviation is 20 kW.

[0120] The third part describes the content of determining the first target power upper limit based on the sum of the continuous discharge power and the first reference power deviation.

[0121] It should be understood that since the first reference power deviation is the amplitude for adjusting the upper limit of the output power of the power battery, the first target power upper limit can be determined based on the sum of the continuous discharge power and the first reference power deviation.

[0122] For example, if the first reference power deviation is 20 kW and the continuous discharge power is 20 kW, then the first target power upper limit is 40 kW.

[0123] Step 303 : determining whether the output power of the power battery has completed switching based on a plurality of minimum cell voltages of the power battery.

[0124] The power battery includes a plurality of battery cells, and the minimum cell voltage is the minimum voltage among the plurality of battery cell voltages of the power battery.

[0125] It should be understood that when a power battery's power limit switches from peak discharge power to continuous discharge power, the power battery's output power decreases, the power battery's current decreases, the chemical reaction rate and ion diffusion within the cell gradually return to equilibrium, concentration polarization and electrochemical polarization partially subside, the internal battery voltage drop decreases, and the battery terminal voltage subsequently rebounds, i.e., voltage rebound occurs. In this case, whether the power battery's output power has completed the switch is determined based on the power battery's multiple minimum cell voltages.

[0126] In some embodiments, when the difference between the first minimum cell voltage and the second minimum cell voltage is greater than a second preset voltage, it is determined that the upper limit of the output power of the power battery has not been switched.

[0127] The first minimum cell voltage is the minimum cell voltage collected when the upper limit of the power battery output power is currently calculated; the second minimum cell voltage is the minimum cell voltage collected when the upper limit of the power battery output power is previously calculated.

[0128] The second preset voltage is automatically determined by the vehicle controller, and the embodiment of the present application is not limited thereto. For example, the second preset voltage is 0.

[0129] It should be understood that in actual applications, a voltage rebound phenomenon may occur in the power battery when the power battery's output power upper limit is switched. If the difference between the power battery's minimum cell voltage collected when the current power battery's output power upper limit is calculated and the minimum cell voltage collected when the power battery's output power upper limit was previously calculated is greater than 0, it means that the power battery's current minimum cell voltage is greater than the previous minimum cell voltage. However, in actual applications, as time passes and the power battery's discharge time becomes longer, the power battery's minimum cell voltage should decrease. If the power battery's current minimum cell voltage is greater than the previous minimum cell voltage, it indicates that the power battery's output power upper limit has not been switched.

[0130] In some embodiments, the minimum cell voltage is collected at a frequency of a first preset time length.

[0131] In some embodiments, when the difference between the first minimum cell voltage and the second minimum cell voltage is less than a second preset voltage, the upper limit of the output power of the power battery is determined to complete the switching.

[0132] It should be understood that if the difference between the minimum cell voltage of the power battery collected during the current calculation of the power battery's output power upper limit and the minimum cell voltage collected during the previous calculation of the power battery's output power upper limit is less than 0, it means that the current minimum cell voltage of the power battery is less than the previous minimum cell voltage. In actual applications, the minimum cell voltage of the power battery should decrease over time and with the application of the power battery. If the current minimum cell voltage of the power battery is less than the previous minimum cell voltage, it indicates that the power battery's output power upper limit has been switched.

[0133] In this case, since multiple minimum cell voltages can determine whether the power battery is in a voltage rebound phenomenon, it is possible to determine whether the output power of the power battery has completed switching based on the multiple minimum cell voltages.

[0134] Step 304 : Determine whether the first target power upper limit meets the power requirement of the vehicle based on the driving parameters of the vehicle.

[0135] The vehicle's driving parameters include the vehicle's speed and the vehicle's accelerator pedal opening.

[0136] It should be understood that the first target power limit is related to the first threshold, continuous discharge power, and peak discharge power, so the first target power limit will not cause over-discharge of the power battery. However, in actual applications, if the vehicle needs to accelerate, it is necessary to determine whether the first target power limit meets the vehicle's power requirements.

[0137] In some embodiments, when the difference between the first vehicle speed and the second vehicle speed is greater than a first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is greater than a first preset opening, it is determined that the first target power upper limit meets the power demand of the vehicle.

[0138] Among them, the first vehicle speed is the vehicle speed collected when the upper limit of the power battery output power is currently calculated; the second vehicle speed is the vehicle speed collected when the upper limit of the power battery output power was previously calculated; the first accelerator pedal opening is the accelerator pedal opening collected when the upper limit of the power battery output power is currently calculated; the second accelerator pedal opening is the accelerator pedal opening collected when the upper limit of the power battery output power was previously calculated.

[0139] The first preset speed is automatically determined by the vehicle controller, and the present embodiment is not limited thereto. For example, the first preset speed is 0 kilometers per hour (KPH).

[0140] The first preset opening is automatically determined by the vehicle controller, and the present embodiment is not limited thereto. For example, the first preset opening is 0%.

[0141] It should be understood that in actual application, if the difference between the first vehicle speed and the second vehicle speed is greater than the first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is greater than the first preset opening, it means that the vehicle speed has increased and the user has the intention to accelerate. Then the first target power upper limit at this time meets the power requirements of the vehicle.

[0142] In some embodiments, when the difference between the first vehicle speed and the second vehicle speed is less than a first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is less than a first preset opening, it is determined that the first target power upper limit meets the power demand of the vehicle.

[0143] It should be understood that in actual application, if the difference between the first vehicle speed and the second vehicle speed is less than the first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is less than the first preset opening, it means that the user has no intention to accelerate and the vehicle speed has not increased. In this case, the first target power upper limit meets the vehicle's power requirements.

[0144] In some embodiments, when the difference between the first vehicle speed and the second vehicle speed is less than the first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is greater than the first preset opening, it is determined that the first target power upper limit does not meet the power demand of the vehicle.

[0145] It should be understood that in actual application, the difference between the first vehicle speed and the second vehicle speed is less than the first preset vehicle speed, but the difference between the first accelerator pedal opening and the second accelerator pedal opening is greater than the first preset opening, indicating that the user has an intention to accelerate but the vehicle speed has not increased. In this case, the first target power upper limit does not meet the vehicle's power requirements.

[0146] In this case, the driving parameters of the vehicle can determine whether the first target upper power limit meets the power demand of the vehicle, so as to subsequently determine whether to adjust the first target upper power limit.

[0147] Step 305 : If the output power of the power battery has not been switched and the first target upper power limit meets the power demand of the vehicle, the upper limit of the output power of the power battery is switched to the first target upper power limit.

[0148] It should be understood that in actual applications, if the upper limit of the output power of the power battery is directly switched to the first target power upper limit, the voltage or current will fluctuate, which will interfere with the normal operation of the power management system. Therefore, in order to avoid sudden voltage spikes or current fluctuations, it is necessary to make the output voltage and current changes of the power battery more stable, that is, to smoothly switch the upper limit of the output power of the power battery.

[0149] In some embodiments, the upper limit of the output power of the power battery is switched from the peak discharge power to the first target power upper limit at a preset rate.

[0150] Among them, the preset rate is automatically determined by the vehicle controller, and the embodiment of the present application is not limited to this.

[0151] Step 306 : If the output power of the power battery has not been switched and the first target upper power limit does not meet the power demand of the vehicle, the upper limit of the output power of the power battery is switched to the second target upper power limit.

[0152] The second target power upper limit is greater than the first target power upper limit. The battery state parameter includes a minimum cell voltage.

[0153] It should be understood that in actual applications, although the output power upper limit of the power battery is adjusted upward to the first target power upper limit, the first target power upper limit still cannot meet the needs of the vehicle. Therefore, based on the first target power upper limit, the output power upper limit of the power battery is adjusted upward again.

[0154] In one possible implementation, when the upper limit of the output power of the power battery has not been switched and the first target power upper limit does not meet the power demand of the vehicle, it is determined based on the minimum cell voltage whether to switch the upper limit of the output power of the power battery to the second target power upper limit.

[0155] In actual applications, although the second target power upper limit can meet the power requirements of the vehicle, if the second target power upper limit is too large, it is easy to cause over-discharge or undervoltage problems in the power battery. Therefore, it is necessary to determine whether the second target power upper limit will cause undervoltage in the power battery based on the minimum cell voltage.

[0156] In some embodiments, when the minimum cell voltage is greater than a first preset voltage, it is determined that the upper limit of the output power of the power battery is switched to the second target power upper limit.

[0157] It should be understood that the minimum cell voltage being greater than the first preset voltage indicates that the power battery is not undervoltage, so the output power upper limit of the power battery can be adjusted upward, that is, it is determined to switch the output power upper limit of the power battery to the second target power upper limit.

[0158] In some embodiments, when the minimum cell voltage is less than or equal to a first preset voltage, it is determined that the upper limit of the output power of the power battery is switched to the first target power upper limit.

[0159] It should be understood that the minimum cell voltage being less than or equal to the first preset voltage indicates that the power battery is undervoltage, and therefore the output power of the power battery cannot be adjusted upward, that is, the upper limit of the output power of the power battery is switched to the first target power upper limit.

[0160] In this embodiment, whether to switch the upper limit of the output power of the power battery to the second target power upper limit is determined based on the minimum cell voltage. That is, under the premise that there is no undervoltage risk of the power battery, the output power upper limit of the power battery is adjusted to ensure the safety of the power battery.

[0161] Optionally, before executing the above step 305, the following steps may also be executed.

[0162] In one possible implementation, a first deviation value between the peak discharge power and the continuous discharge power is determined; a second reference power deviation of the battery is determined based on the product of the first deviation value and a second threshold value; and the second target power upper limit is determined based on the sum of the continuous discharge power and the second reference power deviation.

[0163] The second threshold is greater than the first threshold; the second threshold is used to characterize the degree of deviation between the minimum cell voltage and the first preset voltage, and the first preset voltage is used to determine whether the power battery is undervoltage.

[0164] In some embodiments, the first preset voltage is subtracted from the minimum cell voltage to obtain a second deviation value; and the second threshold value is determined based on a correspondence table between the second deviation value and the second threshold value.

[0165] It is understandable that the specific implementation method of determining the second threshold can refer to the detailed steps of determining the first threshold in the aforementioned step 302, and will not be repeated here.

[0166] In this embodiment, the second target power upper limit can be determined based on the peak discharge power, the continuous discharge power and the second threshold, thereby limiting the output power upper limit of the power battery to avoid over-discharge of the power battery.

[0167] Step 307 : When the upper limit of the output power of the power battery is switched, determine to switch the upper limit of the output power of the power battery to a third target power upper limit.

[0168] The third target power upper limit is smaller than the first target power upper limit.

[0169] It should be understood that when the power upper limit of the power battery is switched, the power upper limit of the power battery may be the first target power upper limit or the second target power upper limit. However, the first target power upper limit and the second target power upper limit are both large. As the power battery is used for a longer time, the power of the power battery will decrease. Therefore, in order to avoid over-discharge of the power battery, when the output power upper limit of the power battery is switched, it is determined that the output power upper limit of the power battery will be switched to the third target power upper limit.

[0170] In some embodiments, when the cumulative discharge amount of the battery of the vehicle is greater than a third preset power amount, it is determined to switch the upper limit of the output power of the power battery to a third target power upper limit.

[0171] Among them, the third preset power is automatically determined by the vehicle controller, and the embodiment of the present application is not limited to this.

[0172] Optionally, before executing step 306 , the following steps may also be executed.

[0173] In a possible implementation, when the upper limit of the output power of the power battery is switched, the third target power upper limit is determined based on the first target power upper limit or the second target power upper limit.

[0174] It should be understood that before the output power upper limit of the power battery is switched, the output power upper limit of the power battery is switched to the first target power upper limit or the second target power upper limit. Therefore, after the output power upper limit of the power battery is switched, the first target power upper limit or the second target power upper limit is adjusted downward to obtain the third target power upper limit.

[0175] In some embodiments, when the upper limit of the output power of the power battery is switched and the upper limit of the output power after the switching is the first target power upper limit, the first target power upper limit is subtracted from the product of the third threshold and the first deviation value to obtain the third target power upper limit.

[0176] The third threshold is automatically determined by the vehicle controller and is not limited in this embodiment of the present application. For example, the third threshold is 1 / 3. The first deviation value is the deviation value between the peak discharge power and the continuous discharge power.

[0177] For example, if the first target power upper limit is 60 kW, the third threshold is 1 / 3, and the first deviation is 21 kW, then the third target power upper limit is 39 kW.

[0178] It should be understood that when the upper limit of the output power of the power battery is switched and the upper limit of the output power after switching is the first target power upper limit, the first target power is adjusted downward to obtain the third target power upper limit.

[0179] In some embodiments, when the upper limit of the output power of the power battery is switched and the upper limit of the output power after the switching is the second target power upper limit, the product of the fourth threshold and the first deviation value is subtracted from the second target power upper limit to obtain the third target power upper limit.

[0180] The third threshold is automatically determined by the vehicle controller and is not limited in this embodiment of the present application. For example, the third threshold is 1 / 3. The first deviation value is the deviation value between the peak discharge power and the continuous discharge power.

[0181] For example, if the first target power upper limit is 70 kW, the third threshold is 1 / 3, and the first deviation is 21 kW, then the third target power upper limit is 49 kW.

[0182] It should be understood that when the upper limit of the output power of the power battery is switched and the upper limit of the output power after the switching is the second target power upper limit, the second target power is adjusted downward to obtain the third target power upper limit.

[0183] In this embodiment, when the upper limit of the output power of the power battery is switched, the third target power upper limit is determined based on the first target power upper limit or the second target power upper limit, so that different third target power upper limits can be determined according to different output power upper limits, making the third target power upper limit more accurate.

[0184] An embodiment of the present application provides a vehicle battery power adjustment method. The method can obtain the peak discharge power, continuous discharge power, and multiple minimum cell voltages of a power battery in response to a power upper limit switching request for a vehicle's power battery. If the vehicle has an acceleration power demand, after the power upper limit of the power battery is switched, the power upper limit of the power battery may not meet the vehicle's power demand. Therefore, a first target power upper limit of the power battery is determined based on the peak discharge power, continuous discharge power, and a first threshold. A determination is made based on the multiple minimum cell voltages of the power battery whether the power output power of the power battery has been switched. A determination is made based on the vehicle's driving parameters whether the first target power upper limit meets the vehicle's power demand. If the power output power of the power battery has not been switched and the first target power upper limit meets the vehicle's power demand, the power output power upper limit of the power battery is switched to the first target power upper limit. If the power output power of the power battery has not been switched and the first target power upper limit does not meet the vehicle's power demand, the power output power upper limit of the power battery is switched to the second target power upper limit. If the power output power upper limit of the power battery has been switched, a determination is made to switch the power output power upper limit of the power battery to the third target power upper limit. That is, the output power upper limit of the power battery is adjusted upward or downward based on the power upper limit switching request to meet the power demand of the vehicle while avoiding the problem of over-discharge of the power battery.

[0185] Figure 4 It is a structural schematic diagram of a vehicle battery power adjustment device provided in an embodiment of the present application.

[0186] For example, Figure 4 As shown, the apparatus 400 includes:

[0187] an acquisition module 401 for acquiring a battery status parameter of a power battery of a vehicle in response to a power upper limit switching request for the power battery of the vehicle, wherein the power upper limit switching request is used to adjust an upper limit of an output power of the power battery;

[0188] a determination module 402 configured to determine a first target power upper limit of the power battery based on the battery state parameter and a first threshold, wherein the first threshold is used to constrain an adjustment range of an upper limit of an output power of the power battery;

[0189] The switching module 403 is configured to switch the upper limit of the output power of the power battery to the first target upper limit of the output power if the upper limit of the output power of the power battery has not been switched and the first target upper limit of the power meets the power requirement of the vehicle.

[0190] In one possible implementation, the device 400 includes:

[0191] a deviation determination module, configured to determine a first deviation value between the peak discharge power and the continuous discharge power;

[0192] a deviation determination module, configured to determine a first reference power deviation of the power battery based on the first deviation value and the first threshold value; the first threshold value is used to represent a degree of deviation between the minimum cell voltage and a first preset voltage, and the first preset voltage is used to determine whether the power battery is undervoltage;

[0193] The determination module 402 is configured to determine the first target power upper limit based on the sum of the continuous discharge power and the first reference power deviation.

[0194] In one possible implementation, the device 400 includes:

[0195] a switching module 403 configured to switch the upper limit of the output power of the power battery to a second target power upper limit if the upper limit of the output power of the power battery has not been switched and the first target power upper limit does not meet the power requirement of the vehicle; the second target power upper limit is greater than the first target power upper limit;

[0196] The switching module 403 is configured to determine, when the upper limit of the output power of the power battery is switched, to switch the upper limit of the output power of the power battery to a third target power upper limit; the third target power upper limit is smaller than the first target power upper limit.

[0197] In one possible implementation, the device 400 includes:

[0198] An acquisition module 401 is configured to acquire a plurality of minimum cell voltages and driving parameters of the vehicle;

[0199] a switching completion determination module, configured to determine whether the upper limit of the battery power has completed switching based on the multiple minimum cell voltages;

[0200] The power requirement satisfaction module is configured to determine whether the first target power upper limit satisfies the power requirement of the vehicle based on the driving parameter.

[0201] In one possible implementation, the device 400 includes:

[0202] a switching completion determination module, configured to determine that the upper limit of the output power of the power battery has not been switched if the difference between the first minimum cell voltage and the second minimum cell voltage is greater than a second preset voltage; the first minimum cell voltage being the minimum cell voltage collected when the upper limit of the output power of the power battery is currently calculated; and the second minimum cell voltage being the minimum cell voltage collected when the upper limit of the output power of the power battery was previously calculated;

[0203] a switching completion determination module, configured to determine that the upper limit of the output power of the power battery is switched when the difference between the first minimum cell voltage and the second minimum cell voltage is less than a second preset voltage;

[0204] In one possible implementation, the device 400 includes:

[0205] a power demand satisfaction determination module, configured to determine that the first target power upper limit satisfies the power demand of the vehicle when a difference between a first vehicle speed and a second vehicle speed is greater than a first preset vehicle speed and a difference between a first accelerator pedal opening and a second accelerator pedal opening is greater than a first preset opening; the first vehicle speed is a vehicle speed collected when the upper limit of the power battery output power is currently calculated; the second vehicle speed is a vehicle speed collected when the upper limit of the power battery output power is previously calculated; the first accelerator pedal opening is an accelerator pedal opening collected when the upper limit of the power battery output power is currently calculated; and the second accelerator pedal opening is an accelerator pedal opening collected when the upper limit of the power battery output power is previously calculated;

[0206] The power demand determination module is configured to determine whether the first target power upper limit meets the power demand of the vehicle when the difference between the first vehicle speed and the second vehicle speed is less than a first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is less than a first preset opening.

[0207] In one possible implementation, the device 400 includes:

[0208] a deviation determination module, configured to determine a first deviation value between the peak discharge power and the continuous discharge power;

[0209] a deviation determination module, configured to determine a second reference power deviation of the battery based on a product of the first deviation value and a second threshold value, wherein the second threshold value is greater than the first threshold value;

[0210] A determination module 402 is configured to determine the second target power upper limit based on the sum of the continuous discharge power and the second reference power deviation;

[0211] The switching module 403 is configured to switch the upper limit of the output power of the power battery to the second target power upper limit.

[0212] In one possible implementation, the device 400 includes:

[0213] The determination module 402 is configured to determine the third target power upper limit based on the first target power upper limit or the second target power upper limit when the upper limit of the output power of the power battery is switched.

[0214] In one possible implementation, the device 400 includes:

[0215] a determination module 402 configured to, when the upper limit of the output power of the power battery is switched and the upper limit of the output power after the switching is completed is the first target power upper limit, subtract a product of a third threshold and a first deviation value from the first target power upper limit to obtain a third target power upper limit;

[0216] The determination module 402 is used to, when the upper limit of the output power of the power battery is switched and the upper limit of the output power after switching is the second target power upper limit, subtract the product of the fourth threshold and the first deviation value from the second target power upper limit to obtain the third target power upper limit.

[0217] Figure 5 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0218] For example, Figure 5 As shown, the vehicle 500 includes: a memory 501 and a processor 502, wherein the memory 501 stores an executable program code 503, and the processor 502 is used to call and execute the executable program code 503 to perform a vehicle battery power adjustment method.

[0219] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to perform a vehicle battery power adjustment method provided in an embodiment of the present application.

[0220] In this embodiment, the device can be divided into functional modules based on the above-described method examples. For example, each functional module can be mapped to a specific functional module, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only a logical functional division. In actual implementation, other division methods may be used.

[0221] In the case of dividing the functional modules into modules corresponding to the respective functions, the device may further include a module for determining a deviation, a module for determining that a switching is completed, and a module for determining that a power demand is satisfied. It should be noted that all relevant contents of the various steps involved in the above method embodiment can be referred to the functional description of the corresponding functional modules and will not be repeated here.

[0222] It should be understood that the device provided in this embodiment is used to execute the above-mentioned vehicle battery power adjustment method, and thus can achieve the same effect as the above-mentioned implementation method.

[0223] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is used in a vehicle, the processing module may be used to control and manage the vehicle's movements, while the storage module may be used to support the vehicle's execution of relevant program codes.

[0224] The processing module may be a processor or controller that implements or executes the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor (DSP) and a microprocessor, and the storage module may be a memory.

[0225] In addition, the device provided in the embodiments of the present application can specifically be a chip, component or module, and the chip may include a connected processor and memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a vehicle battery power adjustment method provided in the above embodiment.

[0226] This embodiment also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a vehicle battery power adjustment method provided in the above embodiment.

[0227] This embodiment also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement the method for adjusting the vehicle battery power provided in the above embodiment.

[0228] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0229] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0230] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0231] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for adjusting vehicle battery power, characterized in that: The method comprises: acquiring a battery state parameter of the power battery in response to a power upper limit switching request for a power battery of the vehicle, wherein the power upper limit switching request is used to adjust an upper limit of an output power of the power battery; determining a first target power upper limit of the power battery based on the battery state parameter and a first threshold, wherein the first threshold is used to constrain an adjustment range of an upper limit of the output power of the power battery; If the upper limit of the output power of the power battery has not been switched and the first target upper limit power meets the power demand of the vehicle, the upper limit of the output power of the power battery is switched to the first target upper limit power.

2. The method according to claim 1, characterized in that The battery status parameters include peak discharge power, continuous discharge power, and minimum cell voltage. Determining a first target power upper limit of the power battery based on the battery status parameters and a first threshold value includes: determining a first deviation value between the peak discharge power and the continuous discharge power; determining a first reference power deviation of the power battery based on the first deviation value and the first threshold value; the first threshold value is used to represent the degree of deviation between the minimum cell voltage and a first preset voltage, and the first preset voltage is used to determine whether the power battery is undervoltage; The first target power upper limit is determined based on the sum of the continuous discharge power and the first reference power deviation.

3. The method according to claim 1, characterized in that The method further comprises: If the upper limit of the output power of the power battery has not been switched and the first target upper limit power does not meet the power demand of the vehicle, switching the upper limit of the output power of the power battery to a second target upper limit power; the second target upper limit power is greater than the first target upper limit power; When the upper limit of the output power of the power battery is switched, it is determined to switch the upper limit of the output power of the power battery to a third target upper limit power; the third target upper limit power is smaller than the first target upper limit power.

4. The method according to claim 1, wherein The battery state parameter includes a minimum cell voltage. Before switching the upper limit of the output power of the power battery to the first target upper limit of the power battery when the upper limit of the output power of the power battery has not been switched and the first target upper limit of the power power meets the power demand of the vehicle, the method includes: obtaining a plurality of the minimum cell voltages and the driving parameters of the vehicle; determining whether the upper limit of the output power has completed switching based on the multiple minimum cell voltages; A determination is made based on the driving parameter whether the first target upper power limit meets a power demand of the vehicle.

5. The method according to claim 4, characterized in that The determining whether the upper limit of the output power is switched based on the multiple minimum cell voltages includes: If the difference between the first minimum cell voltage and the second minimum cell voltage is greater than a second preset voltage, it is determined that the upper limit of the output power of the power battery has not been switched; the first minimum cell voltage is the minimum cell voltage collected when the upper limit of the output power of the power battery is currently calculated; the second minimum cell voltage is the minimum cell voltage collected when the upper limit of the output power of the power battery was previously calculated; When the difference between the first minimum cell voltage and the second minimum cell voltage is less than a second preset voltage, determining the upper limit of the output power of the power battery to complete the switching; The driving parameters include the vehicle speed and the accelerator pedal opening of the vehicle. The determining, based on the driving parameters, whether the first target upper power limit meets the power demand of the vehicle includes: When the difference between the first vehicle speed and the second vehicle speed is greater than a first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is greater than the first preset opening, determining that the first target power upper limit meets the power demand of the vehicle; the first vehicle speed is the vehicle speed collected when the upper limit of the power battery output power is currently calculated; the second vehicle speed is the vehicle speed collected when the upper limit of the power battery output power was previously calculated; the first accelerator pedal opening is the accelerator pedal opening collected when the upper limit of the power battery output power is currently calculated; and the second accelerator pedal opening is the accelerator pedal opening collected when the upper limit of the power battery output power was previously calculated; When the difference between the first vehicle speed and the second vehicle speed is less than a first preset vehicle speed and the difference between the first accelerator pedal opening and the second accelerator pedal opening is less than a first preset opening, it is determined that the first target power upper limit meets the power demand of the vehicle.

6. The method according to claim 3, characterized in that The battery status parameters include peak discharge power and continuous discharge power. Before switching the upper limit of the output power of the power battery to the second target power upper limit, the method includes: determining a first deviation value between the peak discharge power and the continuous discharge power; determining a second reference power deviation of the battery based on a product of the first deviation value and a second threshold value, wherein the second threshold value is greater than the first threshold value; The second target power upper limit is determined based on the sum of the continuous discharge power and the second reference power deviation.

7. The method according to claim 3, characterized in that The battery state parameters include peak discharge power and continuous discharge power. Before determining to switch the upper limit of the output power of the power battery to the third target power upper limit, the process includes: When the upper limit of the output power of the power battery is switched, the third target power upper limit is determined based on the first target power upper limit or the second target power upper limit.

8. The method according to claim 7, characterized in that When the upper limit of the output power of the power battery is switched, determining the third target power upper limit based on the first target power upper limit or the second target power upper limit includes: When the upper limit of the output power of the power battery is switched and the upper limit of the output power after the switching is the first target power upper limit, subtracting the product of the third threshold and the first deviation value from the first target power upper limit to obtain the third target power upper limit; When the upper limit of the output power of the power battery is switched and the upper limit of the output power after switching is the second target power upper limit, the product of the fourth threshold and the first deviation value is subtracted from the second target power upper limit to obtain the third target power upper limit.

9. A vehicle battery power adjustment device, characterized in that: The device comprises: an acquisition module, configured to acquire a battery state parameter of a power battery in response to a power upper limit switching request for a power battery of a vehicle, wherein the power upper limit switching request is used to adjust an upper limit of an output power of the power battery; a determination module, configured to determine a first target power upper limit of the power battery based on the battery state parameter and a first threshold, wherein the first threshold is used to constrain an adjustment range of an upper limit of an output power of the power battery; The switching module is configured to switch the upper limit of the output power of the power battery to the first target upper limit of the output power if the upper limit of the output power of the power battery has not been switched and the first target upper limit of the power meets the power demand of the vehicle.

10. A vehicle, characterized in that: The vehicle comprises: a memory for storing executable program code; A processor is configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 8.

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