Soc monitoring method and apparatus, vehicle, and storage medium

Abstract

The application relates to the technical field of automobile power batteries, in particular to an SOC monitoring method and device, a vehicle and a storage medium, wherein the method comprises the following steps: acquiring actual power supply power of a whole vehicle within a preset time length; calculating a first change amount of a state of charge (SOC) of the whole vehicle within the preset time length according to the actual power supply power, and detecting a second change amount of the SOC of a power battery within the preset time length; calculating SOC precision of the power battery according to the first change amount and the second change amount, and correcting and monitoring the power battery according to the SOC precision. Therefore, the problems that the condition of triggering dynamic correction of battery SOC is harsh in the prior art, long-time SOC correction has a great influence on battery performance, safety and service life and the like are solved.

Description

Technical Field

[0001] This application relates to the field of automotive power battery technology, and in particular to a SOC (State of Charge) monitoring method, device, vehicle, and storage medium. Background Technology

[0002] Nickel-metal hydride batteries have been widely used in hybrid vehicles, but in order to achieve energy conservation and emission reduction, they will be replaced by higher-performance lithium-ion batteries.

[0003] Among them, the effective management of lithium-ion battery packs is the key to ensuring the stable performance and safety of electric vehicles. Therefore, SOC estimation, as the core of battery management technology, is of great significance to improving the overall vehicle performance and is also a difficult point in battery management.

[0004] For hybrid vehicles, the battery SOC is rarely fully charged and discharged, and dynamic correction is generally used. However, the conditions for triggering dynamic correction of battery SOC are extremely demanding. If the SOC is not corrected for a long time, it will have a great impact on battery performance, safety and lifespan. Summary of the Invention

[0005] This application provides a SOC monitoring method, device, vehicle, and storage medium to solve the problems in related technologies, such as the stringent conditions for triggering dynamic correction of battery SOC and the significant impact of prolonged SOC non-correction on battery performance, safety, and lifespan.

[0006] The first aspect of this application provides a State of Charge (SOC) monitoring method, comprising the following steps: obtaining the actual power supply of the vehicle within a preset time period; calculating a first change in the SOC of the vehicle within the preset time period based on the actual power supply, and detecting a second change in the SOC of the power battery within the preset time period; calculating the SOC accuracy of the power battery based on the first change and the second change, and performing corrective monitoring on the power battery based on the SOC accuracy.

[0007] Optionally, the step of calculating the first change in the state of charge (SOC) of the vehicle within the preset time period based on the actual power supply includes: obtaining the rated capacity of the power battery; and calculating the first change based on the actual power supply, the preset time period, and the rated capacity.

[0008] Optionally, obtaining the actual power supply of the vehicle within a preset time period includes: obtaining the voltage and current of the vehicle's powertrain; and calculating the power supply of the vehicle based on the voltage and current.

[0009] Optionally, the step of correcting and monitoring the power battery based on the SOC accuracy includes: identifying the actual accuracy level of the SOC accuracy; and performing corresponding monitoring actions on the power battery based on the actual accuracy level.

[0010] Optionally, the accuracy level includes first to fourth accuracy levels, and the higher the accuracy level, the worse the SOC accuracy.

[0011] Optionally, the step of performing corresponding monitoring actions on the power battery according to the actual accuracy level includes: if the actual accuracy level is a first accuracy level, then determining that the vehicle has no faults; if the actual accuracy level is a second accuracy level, then generating a SOC correction prompt message, and using the correction prompt message to prompt the user to correct the SOC of the power battery; if the actual accuracy level is a third accuracy level, then generating a SOC correction prompt message and a power limiting command, using the correction prompt message to prompt the user to correct the SOC of the power battery, and limiting the output power of the power battery according to the power limiting command; if the actual accuracy level is a fourth accuracy level, then controlling the high-voltage delay of the vehicle to shut down, and correcting the SOC of the power battery.

[0012] Optionally, identifying the actual accuracy level of the SOC accuracy includes: if the SOC accuracy is less than or equal to a first preset accuracy, then determining the actual accuracy level as a first accuracy level; if the SOC accuracy is greater than the first preset accuracy and less than or equal to a second preset accuracy, then determining the actual accuracy level as a second accuracy level, wherein the second preset accuracy is greater than the first preset accuracy; if the SOC accuracy is greater than the second preset accuracy and less than or equal to a third preset accuracy, then determining the actual accuracy level as a third accuracy level, wherein the third preset accuracy is greater than the second preset accuracy; if the SOC accuracy is greater than the third preset accuracy, then determining the actual accuracy level as a fourth accuracy level.

[0013] A second aspect of this application provides a State of Charge (SOC) monitoring device, comprising: an acquisition module for acquiring the actual power supply of a vehicle within a preset time period; a calculation module for calculating a first change in the SOC of the vehicle within the preset time period based on the actual power supply; a detection module for detecting a second change in the SOC of a power battery within the preset time period; and a monitoring module for calculating the SOC accuracy of the power battery based on the first change and the second change, and monitoring the power battery based on the SOC accuracy.

[0014] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the SOC monitoring method as described in the above embodiments.

[0015] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the SOC monitoring method as described in the above embodiments.

[0016] Therefore, this application has at least the following beneficial effects:

[0017] This application's embodiments can analyze the energy conversion and transfer process in the electric vehicle powertrain by acquiring the actual power supply. Based on the actual power supply, it calculates and detects the change in the vehicle's State of Charge (SOC) over a preset time period. This allows for the determination of the battery's SOC change through different methods, improving the accuracy of battery SOC calculation and enabling real-time correction monitoring of the battery. This enhances the accuracy of SOC monitoring, ensuring system protection before vehicle malfunctions and extending battery life. Therefore, it solves the technical problems in related technologies, such as the stringent conditions for triggering dynamic SOC correction and the significant impact of prolonged SOC non-correction on battery performance, safety, and lifespan.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 This is a flowchart of the SOC monitoring method provided according to an embodiment of this application;

[0021] Figure 2 This is a flowchart of a SOC monitoring method provided according to an embodiment of this application;

[0022] Figure 3 This is an example diagram of a SOC monitoring device according to an embodiment of this application;

[0023] Figure 4 This is a structural schematic diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] Lithium-ion batteries are widely used in new energy commercial vehicles due to their advantages in energy density, cycle life, and power density. However, improper management of lithium-ion batteries can lead to safety accidents such as fires and explosions, which is detrimental to the development of the electric vehicle industry. The state of charge (SOC) of lithium-ion batteries is crucial for effective battery management and improving overall vehicle performance, thus enhancing the competitive advantage of electric vehicles in the market. Real-time monitoring of the vehicle's SOC via the VCU (Vehicle Control Unit) can issue timely warnings before battery failures occur, effectively ensuring safe driving and driver safety.

[0026] However, in related technologies, battery SOC correction only includes static correction, dynamic correction, full charge correction, and full discharge correction. For hybrid vehicles, customers rarely perform full charge and full discharge. The dynamic correction is triggered when the SOC is below a certain threshold and the battery charging and discharging current fluctuates within a certain range for a certain period of time. The conditions for triggering dynamic correction are extremely stringent. Long-term failure to correct the SOC has a significant impact on battery performance, safety, and lifespan.

[0027] The following description, with reference to the accompanying drawings, outlines a SOC monitoring method, apparatus, vehicle, and storage medium according to embodiments of this application. Addressing the issue of correcting and monitoring the SOC of batteries during the charging and discharging of hybrid electric vehicles mentioned in the background art, this application provides an SOC monitoring method. In this method, embodiments of this application can analyze the energy conversion and transfer process in the electric vehicle's powertrain by acquiring the actual power supply. Based on the actual power supply, the change in the vehicle's SOC over a preset time period is calculated and detected. This allows for the determination of the change in the power battery's SOC through different methods, improving the accuracy of battery SOC calculation and enabling real-time correction monitoring of the power battery. This enhances the accuracy of SOC monitoring, ensures system protection before vehicle malfunctions, and extends battery life. Therefore, this solves the technical problems in related technologies, such as the stringent conditions for triggering dynamic SOC correction and the significant impact of prolonged SOC non-correction on battery performance, safety, and lifespan.

[0028] Specifically, Figure 1 This is a flowchart illustrating the SOC monitoring method provided in the embodiments of this application.

[0029] like Figure 1As shown, this SOC monitoring method includes the following steps:

[0030] In step S101, the actual power supply of the whole vehicle within a preset time period is obtained.

[0031] The preset duration can be 1 hour or 2 hours, etc.

[0032] In this embodiment of the application, obtaining the actual power supply of the vehicle within a preset time period includes: obtaining the voltage and current of the vehicle's powertrain; and calculating the power supply of the vehicle based on the voltage and current.

[0033] It is understood that the embodiments of this application can calculate the power supply of the whole vehicle based on voltage and current, and calculate the power of the energy provided by the power battery and engine to each component under different operating conditions through VCU, thereby analyzing the energy conversion and transfer process in the electric vehicle powertrain, and thus determining the power supply of the whole vehicle.

[0034] In step S102, the first change in the state of charge (SOC) of the vehicle within a preset time period is calculated based on the actual power supply, and the second change in the SOC of the power battery within the preset time period is detected.

[0035] The first change is the change calculated based on the energy distribution of the whole vehicle, and the second change is the change calculated based on the SOC of the power battery. For example, if the SOC of the power battery is detected at the first moment and is the first SOC, and the SOC of the power battery is detected at the second moment and is the second SOC, then the second change is the difference between the first SOC and the second SOC, and the time difference between the second moment and the first moment is the preset duration.

[0036] It is understood that the embodiments of this application can obtain the first change and the second change based on the overall vehicle energy and the SOC detection of the power battery, thereby determining the change of the power battery in different ways.

[0037] In this embodiment of the application, the calculation of the first change in the state of charge (SOC) of the vehicle within a preset time period based on the actual power supply includes: obtaining the rated capacity of the power battery; and calculating the first change based on the actual power supply, the preset time period, and the rated capacity.

[0038] Rated capacity can be the capacity of a battery to operate continuously under rated working conditions for an extended period of time, such as 54Ah.

[0039] It is understood that the embodiments of this application can calculate the first change based on the actual power supply, preset duration and rated capacity, which can both accumulate data to evaluate the SOC calculation level of the battery BMS and monitor SOC changes to detect problems in a timely manner.

[0040] It should be noted that in this embodiment, the first change is calculated based on the actual power supply, preset duration, and rated capacity. The specific calculation method is as follows:

[0041] △SOC vehicle=(UISG*IISG+UDCDC*IDCDC+UDCAC*IDCAC)*△t / BAT_ENERGY

[0042] Among them, U ISG I represents DC voltage. ISG U represents direct current. DCDC Indicates variable DC voltage, I DCDC U represents variable direct current. DCAC I represents alternating current voltage. DCAC This represents the alternating current, Δt represents the preset duration, and BAT_ENERGY is the rated capacity of the battery.

[0043] In step S103, the SOC accuracy of the power battery is calculated based on the first change and the second change, and the power battery is corrected and monitored based on the SOC accuracy.

[0044] It is understood that the embodiments of this application can calculate the accuracy of the battery SOC based on the first change and the second change. The different accuracies obtained from the calculation are beneficial for correcting and monitoring the power battery, thereby calculating the charging and discharging energy of the whole vehicle through the energy flow analysis of the whole vehicle, and realizing real-time correction and monitoring of the power battery SOC accuracy.

[0045] It should be noted that the SOC accuracy of the power battery can be calculated based on the difference between the first change and the second change in the embodiments of this application. The specific calculation method is as follows: SOC accuracy = first change - second change. For example, if the first change is 41% and the second change is 40%, then the SOC accuracy is 1%.

[0046] In this embodiment of the application, the power battery is monitored and corrected based on the SOC accuracy, including: identifying the actual accuracy level of the SOC accuracy; and performing corresponding monitoring actions on the power battery based on the actual accuracy level.

[0047] The accuracy level can include first to fourth accuracy levels, with higher accuracy levels corresponding to lower SOC accuracy. This is only an example and is not a specific limitation. For example, the accuracy level can also be divided into 3, 5, or 6 levels, and the accuracy levels can be arranged in ascending or descending order to represent the accuracy of SOC. It can also be specifically set, for example, higher accuracy levels correspond to better SOC accuracy.

[0048] It is understood that the embodiments of this application can perform corresponding monitoring actions on the power battery according to the actual accuracy level of the identification, and select appropriate monitoring actions for different accuracy levels of the vehicle, thereby improving the accuracy of SOC monitoring of the power battery, ensuring system protection before vehicle failure occurs, and improving battery life.

[0049] In this embodiment of the application, identifying the actual accuracy level of SOC accuracy includes: if the SOC accuracy is less than or equal to a first preset accuracy, then the actual accuracy level is determined to be the first accuracy level; if the SOC accuracy is greater than the first preset accuracy and less than or equal to a second preset accuracy, then the actual accuracy level is determined to be the second accuracy level, wherein the second preset accuracy is greater than the first preset accuracy; if the SOC accuracy is greater than the second preset accuracy and less than or equal to a third preset accuracy, then the actual accuracy level is determined to be the third accuracy level, wherein the third preset accuracy is greater than the second preset accuracy; if the SOC accuracy is greater than the third preset accuracy, then the actual accuracy level is determined to be the fourth accuracy level.

[0050] The first preset accuracy can be 1%, and the first accuracy level can be normal driving. The second preset accuracy can be 3%, and the second accuracy level can be a first-level fault of the whole vehicle. The third preset accuracy can be 5%, and the third accuracy level can be a second-level fault of the whole vehicle. The fourth accuracy level can be a third-level fault of the whole vehicle.

[0051] It is understood that, in this application embodiment, if the SOC accuracy is less than or equal to a first preset accuracy, it is determined to be at the first accuracy level; if the SOC accuracy is greater than the first preset accuracy and less than or equal to a second preset accuracy, it is determined to be at the second accuracy level; if the SOC accuracy is greater than the second preset accuracy and less than or equal to a third preset accuracy, it is determined to be at the third accuracy level; and if the SOC accuracy is greater than the third preset accuracy, it is determined to be at the fourth accuracy level. This application embodiment can determine the corresponding accuracy level according to different preset accuracy, realize the monitoring of the SOC of the power battery, and reasonably allocate and use the power battery according to the SOC accuracy under operating conditions, temperature and usage conditions, which is beneficial to the management of battery energy and thus ensures the driving range of the vehicle.

[0052] For example, when the SOC accuracy is ≤1%, it is determined to be the first accuracy level; when 1% < SOC accuracy ≤3%, it is determined to be the second accuracy level; when 3% < SOC accuracy ≤5%, it is determined to be the third accuracy level; and when the SOC accuracy >5%, it is determined to be the fourth accuracy level.

[0053] In this embodiment, the monitoring actions performed on the power battery according to the actual accuracy level include: if the actual accuracy level is the first accuracy level, the vehicle is determined to be fault-free; if the actual accuracy level is the second accuracy level, a SOC correction prompt is generated to prompt the user to correct the SOC of the power battery; if the actual accuracy level is the third accuracy level, a SOC correction prompt and a power limiting command are generated to prompt the user to correct the SOC of the power battery while limiting the output power of the power battery according to the power limiting command; if the actual accuracy level is the fourth accuracy level, the high voltage of the vehicle is delayed and the SOC of the power battery is corrected.

[0054] The correction prompt message could include the instrument malfunction indicator light illuminating, etc.

[0055] It is understood that the embodiments of this application can determine that the vehicle is fault-free at the first accuracy level; if it is the second accuracy level, a correction prompt message is generated and used to prompt the user to correct the SOC of the power battery; if it is the third accuracy level, a SOC correction prompt message and a power limiting command are generated, and the correction prompt message is used to prompt the user to correct the SOC of the power battery, while the power limiting command limits the output power of the power battery; if it is the fourth accuracy level, the high voltage of the vehicle is controlled to be delayed to correct the SOC of the power battery. The embodiments of this application can formulate different fault handling mechanisms for different accuracy levels of the vehicle, correct the SOC of the power battery in a timely manner, thereby improving battery performance and driving safety, and extending battery life.

[0056] According to the SOC monitoring method proposed in this application, the embodiment can analyze the energy conversion and transfer process in the electric vehicle powertrain by acquiring the actual power supply. Based on the actual power supply, it calculates and detects the change in the vehicle's State of Charge (SOC) over a preset time period. This allows for the determination of the change in the power battery's SOC through different methods, improving the accuracy of battery SOC calculation and enabling real-time correction monitoring of the power battery. This enhances the accuracy of SOC monitoring, ensures system protection before vehicle malfunctions, and extends battery life. Therefore, it solves the technical problems in related technologies, such as the stringent conditions for triggering dynamic SOC correction and the significant impact of prolonged SOC non-correction on battery performance, safety, and lifespan.

[0057] The SOC monitoring method is illustrated below through a specific embodiment, such as... Figure 2 As shown, it includes the following steps:

[0058] 1. The BMS determines whether the correction is complete based on the battery's own state. If the correction is not completed, it performs a SOC accuracy check. If the correction is complete, it proceeds to the next step to calculate the vehicle's energy flow.

[0059] 2. The vehicle controller performs the vehicle energy flow calculation △SOC. 整车 =(U ISG *I ISG +U DCDC *I DCDC +U DCAC *I DCAC )*△t / BAT_ENERGY, compare the calculated △SOC of the whole vehicle with the △SOC of the battery to obtain the accuracy of the SOC of the whole vehicle;

[0060] 3. When the overall vehicle SOC accuracy is ≤1%, the vehicle is determined to be fault-free and can be driven normally.

[0061] 4. When 1% < vehicle SOC accuracy ≤ 3%, report a Level 1 fault for the whole vehicle, illuminate the instrument fault light, and prompt the customer to fully charge the vehicle or stop the vehicle to correct the SOC.

[0062] 5. When 3% < vehicle SOC accuracy ≤ 5%, report a level 2 fault for the whole vehicle and limit the power of the whole vehicle;

[0063] 6. When the vehicle's SOC accuracy is greater than 5%, report a level 3 fault in the vehicle, delay the high-voltage power-off, and force SOC correction.

[0064] In summary, the embodiments of this application can calculate the electrical power of the energy provided by the power battery and engine to various components under different operating conditions through the VCU. From the perspective of system integration, it analyzes the energy conversion and transfer process in the electric vehicle powertrain. On the one hand, it monitors the energy flow of the whole vehicle in real time. On the other hand, when the energy flow of the whole vehicle does not match the battery SOC, it implements a three-level fault handling mechanism. Different fault handling mechanisms are formulated for different fault levels of the vehicle. Level 1 faults have little impact on the battery, but if the fault is prolonged, it may cause Level 2 faults. Therefore, driving prompts are displayed on the instrument panel so that the driver can assess the risk and take appropriate action. Level 2 faults will cause battery performance degradation. This fault can be controlled by the vehicle control system to limit power driving. Level 3 faults will cause battery damage or seriously affect battery life. This fault can be controlled by the vehicle controller to delay the power-off of the whole vehicle to avoid the battery suddenly losing power due to the direct power-off of the whole vehicle, thereby improving driving safety.

[0065] Next, the SOC monitoring device proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0066] Figure 3 This is a block diagram of the SOC monitoring device according to an embodiment of this application.

[0067] like Figure 3As shown, the SOC monitoring device 10 includes: an acquisition module 100, a calculation module 200, a detection module 300, and a monitoring module 400.

[0068] The acquisition module 100 is used to acquire the actual power supply of the vehicle within a preset time period; the calculation module 200 is used to calculate the first change in the state of charge (SOC) of the vehicle within the preset time period based on the actual power supply; the detection module 300 is used to detect the second change in the SOC of the power battery within the preset time period; and the monitoring module 400 is used to calculate the SOC accuracy of the power battery based on the first and second changes, and to monitor the power battery based on the SOC accuracy.

[0069] In this embodiment of the application, the acquisition module 100 is also used to acquire the rated capacity of the power battery.

[0070] In this embodiment of the application, the acquisition module 100 is further configured to acquire the voltage and current of the vehicle's powertrain.

[0071] In this embodiment of the application, the calculation module 200 is further configured to calculate a first change based on the actual power supply, preset duration, and rated capacity.

[0072] In this embodiment of the application, the calculation module 200 is also used to calculate the power supply of the whole vehicle based on voltage and current.

[0073] It should be noted that the foregoing explanation of the SOC monitoring method embodiment also applies to the SOC monitoring device of this embodiment, and will not be repeated here.

[0074] According to the SOC monitoring device proposed in this application, the embodiment can analyze the energy conversion and transfer process in the electric vehicle powertrain by acquiring the actual power supply. Based on the actual power supply, it calculates and detects the change in the vehicle's State of Charge (SOC) over a preset time period. This allows for the determination of the change in the power battery's SOC through different methods, improving the accuracy of battery SOC calculation and enabling real-time correction monitoring of the power battery. This enhances the accuracy of SOC monitoring, ensures system protection before vehicle malfunctions, and extends battery life. Therefore, it solves the technical problems in related technologies, such as the stringent conditions for triggering dynamic SOC correction and the significant impact of prolonged SOC non-correction on battery performance, safety, and lifespan.

[0075] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0076] The memory 401, the processor 402, and the computer program stored on the memory 401 and capable of running on the processor 402.

[0077] When processor 402 executes the program, it implements the SOC monitoring method provided in the above embodiments.

[0078] Furthermore, the vehicle also includes:

[0079] Communication interface 403 is used for communication between memory 401 and processor 402.

[0080] The memory 401 is used to store computer programs that can run on the processor 402.

[0081] The memory 401 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0082] If the memory 401, processor 402, and communication interface 403 are implemented independently, then the communication interface 403, memory 401, and processor 402 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0083] Optionally, in a specific implementation, if the memory 401, processor 402, and communication interface 403 are integrated on a single chip, then the memory 401, processor 402, and communication interface 403 can communicate with each other through an internal interface.

[0084] Processor 402 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of this application.

[0085] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described SOC monitoring method.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0089] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0090] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0091] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A SOC monitoring method, characterized in that, Includes the following steps: Obtain the actual power supply of the entire vehicle within a preset time period; The first change in the state of charge (SOC) of the vehicle within the preset time period is calculated based on the actual power supply, and the second change in the SOC of the power battery within the preset time period is detected. The SOC accuracy of the power battery is calculated based on the first change and the second change, and the power battery is corrected and monitored based on the SOC accuracy. The step of correcting and monitoring the power battery based on the SOC accuracy includes: Identify the actual accuracy level of the SOC accuracy; Perform corresponding monitoring actions on the power battery according to the actual accuracy level; The accuracy levels include first to fourth accuracy levels, and the higher the accuracy level, the worse the SOC accuracy. The step of performing corresponding monitoring actions on the power battery based on the actual accuracy level includes: If the actual accuracy level is the first accuracy level, then the vehicle is determined to be fault-free. If the actual accuracy level is the second accuracy level, a correction prompt message for SOC is generated, and the correction prompt message is used to prompt the user to correct the SOC of the power battery. If the actual accuracy level is the third accuracy level, then a SOC correction prompt message and a power limit command are generated. The correction prompt message prompts the user to correct the SOC of the power battery, while the power limit command limits the output power of the power battery. If the actual accuracy level is the fourth accuracy level, then the high voltage of the vehicle is delayed and the SOC of the power battery is corrected.

2. The SOC monitoring method according to claim 1, characterized in that, The calculation of the first change in the vehicle's state of charge (SOC) within the preset time period based on the actual power supply includes: Obtain the rated capacity of the power battery; The first change is calculated based on the actual power supply, the preset duration, and the rated capacity.

3. The SOC monitoring method according to claim 1 or 2, characterized in that, The process of obtaining the actual power supply of the entire vehicle within a preset time period includes: Obtain the voltage and current of the vehicle's powertrain; The power supply of the entire vehicle is calculated based on the voltage and current.

4. The SOC monitoring method according to claim 1, characterized in that, The actual accuracy level for identifying the SOC accuracy includes: If the SOC accuracy is less than or equal to the first preset accuracy, then the actual accuracy level is determined to be the first accuracy level; If the SOC accuracy is greater than the first preset accuracy and less than or equal to the second preset accuracy, then the actual accuracy level is determined to be the second accuracy level, wherein the second preset accuracy is greater than the first preset accuracy. If the SOC accuracy is greater than the second preset accuracy and less than or equal to the third preset accuracy, then the actual accuracy level is determined to be the third accuracy level, wherein the third preset accuracy is greater than the second preset accuracy. If the SOC accuracy is greater than the third preset accuracy, then the actual accuracy level is determined to be the fourth accuracy level.

5. A SOC monitoring device, characterized in that, include: The acquisition module is used to acquire the actual power supply of the entire vehicle within a preset time period; The calculation module is used to calculate the first change in the state of charge (SOC) of the vehicle within the preset time period based on the actual power supply. The detection module is used to detect a second change in the SOC of the power battery within the preset time period; The monitoring module is used to calculate the SOC accuracy of the power battery based on the first change and the second change, and to monitor the power battery based on the SOC accuracy. The step of correcting and monitoring the power battery based on the SOC accuracy includes: Identify the actual accuracy level of the SOC accuracy; Perform corresponding monitoring actions on the power battery according to the actual accuracy level; The accuracy levels include first to fourth accuracy levels, and the higher the accuracy level, the worse the SOC accuracy. The step of performing corresponding monitoring actions on the power battery based on the actual accuracy level includes: If the actual accuracy level is the first accuracy level, then the vehicle is determined to be fault-free. If the actual accuracy level is the second accuracy level, a correction prompt message for SOC is generated, and the correction prompt message is used to prompt the user to correct the SOC of the power battery. If the actual accuracy level is the third accuracy level, then a SOC correction prompt message and a power limit command are generated. The correction prompt message prompts the user to correct the SOC of the power battery, while the power limit command limits the output power of the power battery. If the actual accuracy level is the fourth accuracy level, then the high voltage of the vehicle is delayed and the SOC of the power battery is corrected.

6. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the SOC monitoring method as described in any one of claims 1-4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the SOC monitoring method as described in any one of claims 1-4.

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