Evaluation method for equalization capability of battery system, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a battery system equalization capability evaluation method, electronic equipment and a storage medium. The method comprises the steps of performing charge and discharge control on a battery system according to a preset charge and discharge strategy; in the charging and discharging process, charging and discharging information and equalization information of the battery system are collected; classifying the charging and discharging information and the equalization information to obtain charging and discharging data and equalization data corresponding to each stage; and evaluating the equalization capability of the battery system according to the charging and discharging data and the equalization data corresponding to each stage, and the scheme can improve the accuracy of the equalization capability evaluation of the battery system.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a method for evaluating the balancing capability of a battery system, an electronic device, and a storage medium. Background Art

[0002] The battery management system (BMS) is mainly designed to improve battery utilization, prevent overcharging and over-discharging, extend battery life, and monitor battery status. Generally speaking, a battery management system mainly implements the following functions:

[0003] (1) Accurately estimate the state of charge (SOC) of the power battery pack; (2) During the battery charging and discharging process, collect the terminal voltage and temperature, charge and discharge current and total voltage of each battery in the electric vehicle battery pack in real time to prevent the battery from being overcharged or over-discharged; (3) Balance between batteries, that is, balance the single cells to make each battery in the battery pack reach a balanced and consistent state.

[0004] The balancing function of a battery management system (BMS) is crucial for battery systems. Existing techniques primarily assess BMS balancing performance based on the balancing current. While this current can partially reflect balancing performance, a BMS with a higher balancing current does not necessarily produce better balancing than one with a lower current. Therefore, a more objective method is needed to assess BMS balancing performance. Summary of the Invention

[0005] The embodiments of the present application provide a method, electronic device, and storage medium for evaluating the balancing capability of a battery system, which can address the technical defect in the prior art that the evaluation of the balancing capability of a BMS is mainly based on the magnitude of the balancing current, resulting in an objective evaluation, thereby improving the accuracy of the evaluation of the balancing capability of a battery system.

[0006] The present invention provides a method for evaluating the balancing capability of a battery system, including:

[0007] Control the charge and discharge of the battery system according to the preset charge and discharge strategy;

[0008] During the charging and discharging process, collecting charging and discharging information and balancing information of the battery system;

[0009] Classifying the charge-discharge information and the balance information to obtain charge-discharge data and balance data corresponding to each stage;

[0010] The balancing capability of the battery system is evaluated based on the charge and discharge data and balancing data corresponding to each stage.

[0011] Optionally, in some embodiments of the present application, classifying the charge-discharge information and the balance information to obtain the charge-discharge data and the balance data corresponding to each stage includes:

[0012] Dividing the charge and discharge phases according to the charge and discharge time sequence and the charge and discharge status of the batteries in the battery system;

[0013] Based on the divided stages, the charge and discharge data and the balance data corresponding to each stage are respectively acquired from the charge and discharge information and the balance information.

[0014] Optionally, in some embodiments of the present application, dividing the charge and discharge stages according to the charge and discharge time sequence and the charge and discharge status of the battery in the battery system includes:

[0015] Determining, according to the charge and discharge status of the battery in the battery system, the charge and discharge marking time in the charge and discharge time series and the marking time corresponding to the static node;

[0016] The charging and discharging phases are divided based on the charging and discharging marking time and the marking time corresponding to the static node in the charging and discharging time series.

[0017] Optionally, in some embodiments of the present application, evaluating the balancing capability of the battery system according to the charge and discharge data and balancing data corresponding to each stage includes:

[0018] Determine evaluation indicators;

[0019] Compare and analyze the charge and discharge data and balance data of each stage according to the determined evaluation indicators;

[0020] Based on the comparison and analysis results, the balancing capability of the battery system is evaluated.

[0021] Optionally, in some embodiments of the present application, comparing and analyzing the charge and discharge data and the balance data of each stage according to the determined evaluation index includes:

[0022] comparing the voltage consistency of each single battery in the battery system at each stage, and / or;

[0023] Calculate the equilibrium efficiency of each stage, and / or;

[0024] comparing the balanced duty cycle of each single battery in the battery system at each stage, and / or;

[0025] The voltage changes of the individual cells in the battery system during the static process are compared.

[0026] Optionally, in some embodiments of the present application, the method further includes:

[0027] Displaying the voltage change of each of the single cells during the charge, discharge and rest stages, and / or;

[0028] Display balanced current and duty cycle for each phase, and / or;

[0029] Demonstrate balanced efficiency across all stages, and / or;

[0030] Shows the channels that are active when performing equalization operations.

[0031] Optionally, in some embodiments of the present application, evaluating the balancing capability of the battery system based on the comparison and analysis results includes:

[0032] Obtain voltage consistency, balanced efficiency, balanced duty cycle, and voltage change during static state from the comparison analysis results;

[0033] The balancing capability of the battery system is evaluated based on the voltage consistency, balancing efficiency, balancing duty cycle, and voltage change during a static state.

[0034] Optionally, in some embodiments of the present application, after evaluating the balancing capability of the battery system according to the voltage consistency, balancing efficiency, balancing duty cycle, and voltage change during a static state, the method further includes:

[0035] Determining an object to be optimized corresponding to the battery system according to the balancing capability of the battery system;

[0036] Output the optimization strategy corresponding to the object to be optimized.

[0037] Accordingly, the present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program according to any of the steps of the above method.

[0038] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0039] The present application provides a method, electronic device, and storage medium for evaluating the balancing capability of a battery system. After controlling the charge and discharge of a battery system according to a preset charge and discharge strategy, the method collects charge and discharge information and balancing information of the battery system during the charge and discharge process. The method then classifies the charge and discharge information and balancing information to obtain charge and discharge data and balancing data corresponding to each stage. Finally, the method evaluates the balancing capability of the battery system based on the charge and discharge data and balancing data corresponding to each stage. The method utilizes the charge and discharge data and balancing data corresponding to each stage as a basis for evaluating the balancing capability of the battery system, thereby avoiding the problem of inaccurate evaluation caused by using only a single balancing current to evaluate the balancing capability of the battery system. This method solves the technical defect in the prior art that the evaluation of the balancing capability of a BMS mainly relies on the magnitude of the balancing current, resulting in an unobjective evaluation, and improves the accuracy of the evaluation of the balancing capability of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 1 is a flow chart of a method for evaluating the balancing capability of a battery system provided in an embodiment of the present application;

[0042] Figure 2 It is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0044] Embodiments of the present application provide a method, device, electronic device, and storage medium for evaluating the balancing capability of a battery system.

[0045] Among them, the battery system balancing capability evaluation method can be specifically applied in a terminal, which can include a tablet computer or a personal computer (PC). The terminal can establish a wired or wireless connection with a server. The server can include an independently running server or a distributed server, or a server cluster consisting of multiple servers.

[0046] It should be noted that the order of description of the following embodiments does not limit the priority order of the embodiments.

[0047] A method for evaluating the balancing capability of a battery system includes: controlling the charging and discharging of the battery system according to a preset charging and discharging strategy; collecting charging and discharging information and balancing information of the battery system during the charging and discharging process; classifying the charging and discharging information and balancing information to obtain charging and discharging data and balancing data corresponding to each stage; and evaluating the balancing capability of the battery system based on the charging and discharging data and balancing data corresponding to each stage.

[0048] See also Figure 1 , Figure 1 This is a flow chart of a method for evaluating the balancing capability of a battery system provided in an embodiment of the present application. The specific flow of the method for evaluating the balancing capability of a battery system may be as follows:

[0049] 101. Control the charging and discharging of the battery system according to the preset charging and discharging strategy.

[0050] A battery system (BM, S) combines multiple battery cells (monocells) and manages and controls them through a battery management system (BMS) to meet specific application requirements. A preset charge and discharge strategy is a set of rules and parameters predefined in the BMS that control the battery system's charge and discharge processes to ensure battery safety, performance, and lifespan.

[0051] Charge and discharge strategies, including charge current, charge voltage, discharge current, discharge termination voltage, balancing strategy, etc.

[0052] For example, the charging strategy is:

[0053] Charging current: 1C (100A, assuming the battery capacity is 100Ah).

[0054] Charge termination voltage: 4.2V / cell.

[0055] Charging stage: constant current charging to 4.2V, then constant voltage charging until the current drops to 0.05C (5A).

[0056] Charging temperature range: 0℃ to 45℃.

[0057] So, when charging, first check whether the battery temperature is within the allowable range (0℃ to 45℃) and whether the battery voltage is normal. The BMS sends a command to the charger to set the charging current to 1C (100A). The BMS monitors the voltage, current and temperature of each single cell in real time. If the voltage of any single cell reaches 4.2V, it enters the constant voltage charging stage. If the battery temperature exceeds the allowable range, charging is suspended and wait for the temperature to return to normal. When the battery voltage reaches 4.2V, the BMS switches to constant voltage charging mode and sets the charging voltage to 4.2V. The BMS continues to monitor the voltage, current and temperature of each single cell. When the charging current drops to 0.05C (5A), the battery is considered fully charged and charging stops. If the battery temperature exceeds the allowable range, charging is suspended and wait for the temperature to return to normal.

[0058] Furthermore, at the end of charging, the BMS checks the voltage deviation of each battery cell in the battery pack. If the voltage deviation exceeds 0.05V, balancing is initiated. At this point, the BMS controls the balancing circuit to discharge or transfer energy from the high-voltage battery to bring the voltages of all cells in the battery pack into line. The balancing current is set to 0.1C (10A) with a 15% balancing duty cycle.

[0059] For another example, the discharge strategy is:

[0060] Discharge current: 0.5C (50A).

[0061] Discharge end voltage: 3.0V / cell.

[0062] Discharge temperature range: -20℃ to 60℃.

[0063] Balanced strategy:

[0064] Balancing current: 0.1C (10A).

[0065] Balanced duty cycle: 15%.

[0066] Balance trigger condition: voltage deviation exceeds 0.05V.

[0067] First, the battery temperature is checked to see if it is within the allowable range (-20°C to 60°C) and the battery voltage is normal. If the battery temperature is within the allowable range (-20°C to 60°C) and the battery voltage is normal, the BMS sends a command to the load to set the discharge current to 0.5C (50A). The BMS monitors the voltage, current, and temperature of each single cell in real time. If the voltage of any single cell drops to 3.0V, the undervoltage protection phase is entered. If the battery temperature exceeds the allowable range, discharge is suspended and the temperature returns to normal. When the battery voltage drops to 3.0V, the BMS stops discharging to prevent over-discharge. During the discharge process, if the voltage deviation exceeds 0.05V, the BMS controls the balancing circuit to discharge or transfer energy to the high-voltage battery to make the voltage of each single cell in the battery pack consistent.

[0068] 102. During the charging and discharging process, the charging and discharging information and balancing information of the battery system are collected.

[0069] Charge and discharge information refers to various data and parameters related to the battery status and operation during the battery system's charge and discharge process. Balancing information refers to data and parameters related to the balancing operation of each single cell in the battery pack during the battery system's charge and discharge process.

[0070] For example, during the charge and discharge process, current, voltage, temperature, and other data are collected in real time. The voltage and current of each single cell, as well as the current, duty cycle, and active channels during balancing operations, are recorded. Each data point is then timestamped and labeled with its charge and discharge status (charging, discharging, balancing).

[0071] Specifically, the battery system of an electric vehicle collects the following data during a complete charge and discharge cycle:

[0072] Charging process: time: 2 hours; charging current: 100A; charge termination voltage: 4.2V; balancing current: 10A; balancing duty cycle: 15%; balancing channels: 3rd and 7th batteries; balancing efficiency: 80%.

[0073] Discharge process: time: 4 hours; discharge current: 50A; discharge end voltage: 3.0V; balancing current: 10A; balancing duty cycle: 15%; balancing channel: 5th and 9th batteries; balancing efficiency: 75%.

[0074] 103. Classify the charge and discharge information and the balance information to obtain the charge and discharge data and the balance data corresponding to each stage.

[0075] By classifying the data by stage, the charge, discharge and balancing behavior of each stage can be analyzed more clearly, thereby evaluating the performance of the BMS and the consistency of the battery pack. During the charge and discharge process, the operation of the battery system is usually divided into the following stages:

[0076] Charging stage: The process of charging the battery from low power to full power.

[0077] Discharge phase: The process of discharging a battery from full charge to low charge.

[0078] Charging rest stage: After charging is completed, the battery is left to rest for a period of time without any charging or discharging operations.

[0079] Discharge rest stage: After the discharge is completed, the battery is left to rest for a period of time without any charge or discharge operations.

[0080] For example, based on the phase division, collected data can be classified into corresponding phases. Specifically, a data log table can be created to store the charge, discharge, and balancing data for each phase. Timestamps can be added to each data point for subsequent analysis. For example, in the charging phase, timestamps for the start and end of charging can be added, while in the discharging phase, timestamps for the start of discharge and the time period after the end of charging can be added. The specific settings can be adjusted based on actual conditions.

[0081] Optionally, in some embodiments of the present application, the step of “classifying the charge-discharge information and the equalization information to obtain the charge-discharge data and the equalization data corresponding to each stage” may specifically include:

[0082] The charge and discharge stages are divided according to the charge and discharge time series and the charge and discharge status of the batteries in the battery system;

[0083] Based on the divided stages, the charge and discharge data and the balance data corresponding to each stage are obtained from the charge and discharge information and the balance information respectively.

[0084] For example, during the charge and discharge process of the battery system, timestamps, charge and discharge currents, charge and discharge voltages, and battery temperatures are collected in real time. Then, the charge and discharge stages are divided according to the current direction, voltage change, and time series. Specifically, the charging current can be determined as a positive direction, and the discharging current can be determined as a negative direction. Then, the time series data is traversed: the current value and voltage value at each time point are checked one by one, and the current stage is judged according to the current direction and voltage change. For example, when the current is identified to change from a negative value to zero or a positive value, the discharge end time is recorded; for example, when the current changes from zero to a non-zero value, the static end time is recorded. In this way, the charge and discharge stages are divided, thereby obtaining the charge and discharge data and balance data corresponding to each stage from the charge and discharge information and balance information.

[0085] Optionally, in some embodiments of the present application, the step of “dividing the charge and discharge stages according to the charge and discharge time sequence and the charge and discharge status of the batteries in the battery system” may specifically include:

[0086] According to the charge and discharge status of the battery in the battery system, determine the charge and discharge marking time in the charge and discharge time series and the marking time corresponding to the static node;

[0087] The charging and discharging stages are divided based on the charging and discharging marking time in the charging and discharging time series and the marking time corresponding to the static nodes.

[0088] For example, in a charge and discharge time series, the following marker times are determined based on the battery's charge and discharge status: the charge start time is the time when the battery starts charging from a low charge; the charge end time is the time when the battery is fully charged; and the discharge start time is the time when the battery starts discharging from a full charge. The charge and discharge phases are then divided based on these marker times.

[0089] 104. Evaluate the balancing capability of the battery system based on the charge and discharge data and balancing data corresponding to each stage.

[0090] The balancing capability of a battery system refers to the ability of the battery management system (BMS) to maintain consistent voltage and charge across individual cells within a battery pack through specific strategies and control methods. Evaluating the balancing capability of a battery system requires analysis from multiple dimensions. Specifically, this can be assessed based on voltage consistency, balancing efficiency, balancing duty cycle, balancing response time, and balancing stability.

[0091] Optionally, in some embodiments of the present application, “evaluating the balancing capability of the battery system according to the charge and discharge data and balancing data corresponding to each stage” may specifically include:

[0092] Determine evaluation indicators;

[0093] Compare and analyze the charge and discharge data and balance data of each stage according to the determined evaluation indicators;

[0094] Based on the comparison and analysis results, the balancing capability of the battery system is evaluated.

[0095] For example, specifically, based on the determined evaluation indicators, the charge and discharge data and the equalization data of each stage are compared and analyzed. Then, in each stage (charging, discharging, and resting), the charge and discharge data and the equalization data are extracted and analyzed. Finally, based on the comparison and analysis results, the equalization capability of the battery system is comprehensively evaluated. Based on the evaluation results of the above dimensions, the equalization capability of the battery system is comprehensively judged: if the voltage consistency of each stage is good, the equalization efficiency is high, the duty cycle is reasonable, and the equalization stability is good, then the battery system has excellent equalization capability. If the voltage consistency of certain stages is poor, the equalization efficiency is low, the duty cycle is too high or too low, or the equalization response time is long, further analysis of the cause is required.

[0096] Optionally, in some embodiments of the present application, the step of “comparing and analyzing the charge and discharge data and the balance data of each stage according to the determined evaluation index” may specifically include:

[0097] Comparing the voltage consistency of each cell in the battery system at each stage, and / or;

[0098] Calculate the equilibrium efficiency of each stage, and / or;

[0099] comparing the balanced duty cycle of each battery cell in the battery system at each stage, and / or;

[0100] Compare the voltage changes of each single cell in the battery system during the static process.

[0101] For example, comparing the voltage consistency of each cell in a battery system at each stage is an important indicator for evaluating the balancing capability of a battery pack. By comparing the voltage consistency at each stage, the effectiveness of the BMS balancing strategy can be evaluated. The voltage of each cell is recorded at each stage (charging, discharging, and resting).

[0102] The consistency improvement rate is an indicator that measures the degree to which the balancing operation improves the battery pack voltage consistency. Consistency improvement rate = (voltage deviation before balancing - voltage deviation after balancing) / voltage deviation before balancing × 100%. Voltage deviation before balancing = voltage deviation before balancing = maximum voltage (before balancing) - minimum voltage (before balancing); voltage deviation after balancing = maximum voltage (after balancing) - minimum voltage (after balancing). For the charging phase, compare the voltage consistency at the beginning and end of charging; for the discharging phase: compare the voltage consistency at the beginning and end of discharging; for the rest phase: compare the voltage consistency at the beginning and end of rest.

[0103] Balancing efficiency reflects the energy efficiency of the balancing operation. Balancing current, balancing time, and total charge and discharge capacity are recorded at each stage. Balancing efficiency = balancing capacity / total charge and discharge capacity × 100%; balancing capacity = balancing current × balancing time. For the charging stage, the balancing efficiency is calculated during the charging process; for the discharging stage, the balancing efficiency is calculated during the discharging process; and for the resting stage, the balancing efficiency is calculated during the resting process.

[0104] For the balanced duty cycle, balanced duty cycle = balanced time / total operating time × 100%. For the charging stage: compare the balanced duty cycle during the charging process; for the discharging stage: compare the balanced duty cycle during the discharging process; for the rest stage: compare the balanced duty cycle during the rest process.

[0105] The voltage change during the rest period can reflect the battery's self-discharge characteristics and balancing effectiveness. Record the voltage of each cell at the beginning and end of the rest period. Calculate the voltage change before and after the rest period = End of rest voltage - Start of rest voltage. Compare the voltage changes of each cell during the rest period to assess the self-discharge characteristics and balancing effectiveness.

[0106] Optionally, in some embodiments of the present application, the step of “evaluating the balancing capability of the battery system based on the comparison and analysis results” includes:

[0107] Obtain voltage consistency, balanced efficiency, balanced duty cycle, and voltage change during static state from the comparison analysis results;

[0108] The balancing capability of the battery system is evaluated based on voltage consistency, balancing efficiency, balancing duty cycle, and voltage change during the static process.

[0109] For example, if the voltage consistency in each phase is good, the balancing efficiency is high, the duty cycle is reasonable, and the voltage changes during the static process are consistent, it means that the battery system has excellent balancing ability. If the voltage consistency in some phases is poor, the balancing efficiency is low, the duty cycle is too high or too low, or the voltage changes during the static process vary greatly, this can be used to evaluate the balancing ability of the battery system.

[0110] Optionally, in some embodiments of the present application, after the step of “evaluating the balancing capability of the battery system according to voltage consistency, balancing efficiency, balancing duty cycle, and voltage change during the static process”, the following steps may be specifically included:

[0111] Determine the battery system's corresponding optimization objects based on its balancing capabilities;

[0112] Output the optimization strategy corresponding to the object to be optimized.

[0113] Based on the evaluation results, identify the objects to be optimized that affect the battery system's balancing capabilities. These objects include hardware, software, and battery maintenance. Common objects to be optimized include:

[0114] Balancing circuit: If the balancing efficiency is low or the balancing duty cycle is too high, the balancing circuit may need to be upgraded.

[0115] Sensors: If the accuracy of a voltage, current, or temperature sensor is insufficient, it may need to be replaced or calibrated.

[0116] Battery cells: If the consistency of some battery cells is poor, it may be necessary to replace aged or damaged battery cells.

[0117] Balancing strategy: If the voltage consistency improvement rate is low, the balancing strategy may need to be adjusted.

[0118] Control algorithm: If the equalization response time is long, the control algorithm may need to be optimized.

[0119] Fault diagnosis: If faults occur frequently, the fault diagnosis logic may need to be improved.

[0120] Specific optimization strategies can be developed for different optimization targets, such as increasing the number of balancing channels to improve balancing efficiency, or adopting more efficient balancing circuit designs, such as active balancing circuits. Alternatively, balancing current and duty cycle can be dynamically adjusted based on the actual state of the battery pack, reducing balancing response time and improving the real-time nature of balancing operations. These strategies are tailored to specific circumstances and are not detailed here.

[0121] The present application provides a method for evaluating the balancing capability of a battery system. After the battery system is charged and discharged according to a preset charge and discharge strategy, charge and discharge information and balancing information of the battery system are collected during the charge and discharge process. The charge and discharge information and balancing information are then classified to obtain charge and discharge data and balancing data corresponding to each stage. Finally, the balancing capability of the battery system is evaluated based on the charge and discharge data and balancing data corresponding to each stage. The battery system balancing capability evaluation scheme provided by the present application collects charge and discharge information and balancing information of the battery system during the charge and discharge process, and classifies the charge and discharge information and balancing information to obtain charge and discharge data and balancing data corresponding to each stage. When evaluating the balancing capability of the battery system, the charge and discharge data and balancing data corresponding to each stage are used as a basis, thereby avoiding the problem of inaccurate evaluation caused by only using a single balancing current to evaluate the balancing capability of the battery system. Thus, the method can solve the technical defect in the prior art that the evaluation of the balancing capability of the BMS mainly relies on the magnitude of the balancing current, resulting in an objective evaluation, and improve the accuracy of the evaluation of the balancing capability of the battery system.

[0122] In addition, the present invention also provides an electronic device, such as Figure 2 , which shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0123] The electronic device may include one or more processors 301 of processing cores, one or more computer-readable storage media memories 302, a power supply 303, an input unit 304 and other components. Those skilled in the art will appreciate that Figure 2 The electronic device structure shown in the figure does not constitute a limitation of the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange components differently.

[0124] The processor 301 is the control center of the electronic device. It connects all parts of the electronic device using various interfaces and lines. By running or executing software programs and / or modules stored in the memory 302 and accessing data stored in the memory 302, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor primarily processes the operating system, user interface, and application programs, while the modem processor primarily handles wireless communications. It is understood that the modem processor may not be integrated into the processor 301.

[0125] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and evaluates the battery system balancing capability by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area. The program storage area may store an operating system, at least one application required for a function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created based on the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0126] The electronic device also includes a power supply 303 for supplying power to various components. Preferably, the power supply 303 can be logically connected to the processor 301 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The power supply 303 can also include one or more DC or AC power supplies, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and other arbitrary components.

[0127] The electronic device may further include an input unit 304, which may be configured to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0128] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302 to implement various functions as follows:

[0129] The battery system is controlled to charge and discharge according to a preset charge and discharge strategy. During the charge and discharge process, the charge and discharge information and balancing information of the battery system are collected. The charge and discharge information and balancing information are classified to obtain the charge and discharge data and balancing data corresponding to each stage. Based on the charge and discharge data and balancing data corresponding to each stage, the balancing capability of the battery system is evaluated.

[0130] The specific implementation of the above operations can be found in the previous embodiments and will not be repeated here.

[0131] In an embodiment of the present application, after controlling the charge and discharge of a battery system according to a preset charge and discharge strategy, charge and discharge information and balancing information of the battery system are collected during the charge and discharge process. The charge and discharge information and balancing information are then classified to obtain charge and discharge data and balancing data corresponding to each stage. Finally, the balancing capability of the battery system is evaluated based on the charge and discharge data and balancing data corresponding to each stage. The battery system balancing capability evaluation scheme provided by the present application collects charge and discharge information and balancing information of the battery system during the charge and discharge process, and classifies the charge and discharge information and balancing information to obtain charge and discharge data and balancing data corresponding to each stage. When evaluating the balancing capability of the battery system, the charge and discharge data and balancing data corresponding to each stage are used as a basis, thereby avoiding the problem of inaccurate evaluation caused by only using a single balancing current to evaluate the balancing capability of the battery system. This solves the technical defect in the prior art that the evaluation of the balancing capability of the BMS mainly relies on the magnitude of the balancing current, resulting in an unobjective evaluation, and improves the accuracy of the evaluation of the balancing capability of the battery system.

[0132] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be accomplished by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0133] To this end, an embodiment of the present application provides a storage medium storing a plurality of instructions that can be loaded by a processor to execute the steps of any of the battery system balancing capability evaluation methods provided in the embodiments of the present application. For example, the instructions can execute the following steps:

[0134] The battery system is controlled to charge and discharge according to a preset charge and discharge strategy. During the charge and discharge process, the charge and discharge information and balancing information of the battery system are collected. The charge and discharge information and balancing information are classified to obtain the charge and discharge data and balancing data corresponding to each stage. Based on the charge and discharge data and balancing data corresponding to each stage, the balancing capability of the battery system is evaluated.

[0135] The specific implementation of the above operations can be found in the previous embodiments and will not be repeated here.

[0136] The storage medium may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0137] Since the instructions stored in the storage medium can execute the steps of any of the battery system balancing capability evaluation methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any of the battery system balancing capability evaluation methods provided in the embodiments of the present application can be achieved. For details, please refer to the previous embodiments and will not be repeated here.

[0138] The above describes in detail a method for evaluating the balancing capability of a battery system, an electronic device, and a storage medium provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core ideas of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A method for evaluating the balancing capability of a battery system, characterized in that: include: Control the charge and discharge of the battery system according to the preset charge and discharge strategy; During the charging and discharging process, collecting charging and discharging information and balancing information of the battery system; Classifying the charge-discharge information and the balance information to obtain charge-discharge data and balance data corresponding to each stage; The balancing capability of the battery system is evaluated based on the charge and discharge data and balancing data corresponding to each stage.

2. The evaluation method according to claim 1, wherein: The classifying of the charge-discharge information and the balance information to obtain the charge-discharge data and the balance data corresponding to each stage includes: Dividing the charge and discharge phases according to the charge and discharge time sequence and the charge and discharge status of the batteries in the battery system; Based on the divided stages, the charge and discharge data and the balance data corresponding to each stage are respectively acquired from the charge and discharge information and the balance information.

3. The evaluation method according to claim 2, wherein: The dividing of the charge and discharge stages according to the charge and discharge time sequence and the charge and discharge status of the battery in the battery system includes: Determining, according to the charge and discharge status of the battery in the battery system, the charge and discharge marking time in the charge and discharge time series and the marking time corresponding to the static node; The charging and discharging phases are divided based on the charging and discharging marking time and the marking time corresponding to the static node in the charging and discharging time series.

4. The evaluation method according to any one of claims 1 to 3, characterized in that: The evaluating the balancing capability of the battery system according to the charge and discharge data and balancing data corresponding to each stage includes: Determine evaluation indicators; Compare and analyze the charge and discharge data and balance data of each stage according to the determined evaluation indicators; Based on the comparison and analysis results, the balancing capability of the battery system is evaluated.

5. The evaluation method according to claim 4, characterized in that The charge and discharge data and the balance data of each stage are compared and analyzed according to the determined evaluation indicators, including: comparing the voltage consistency of each single battery in the battery system at each stage, and / or; Calculate the equilibrium efficiency of each stage, and / or; comparing the balanced duty cycle of each single battery in the battery system at each stage, and / or; The voltage changes of the individual cells in the battery system during the stationary process are compared.

6. The evaluation method according to claim 5, characterized in that Also includes: Displaying the voltage change of each of the single cells during the charge, discharge and rest stages, and / or; Display balanced current and duty cycle for each phase, and / or; Demonstrate balanced efficiency across all stages, and / or; Shows the channels that are active when performing equalization operations.

7. The evaluation method according to claim 4, characterized in that The evaluating the balancing capability of the battery system based on the comparison and analysis results includes: Obtain voltage consistency, balanced efficiency, balanced duty cycle, and voltage change during static state from the comparison analysis results; The balancing capability of the battery system is evaluated based on the voltage consistency, balancing efficiency, balancing duty cycle, and voltage change during a static state.

8. The evaluation method according to claim 7, characterized in that After evaluating the balancing capability of the battery system according to the voltage consistency, balancing efficiency, balancing duty cycle, and voltage change during a static state, the method further includes: Determining an object to be optimized corresponding to the battery system according to the balancing capability of the battery system; Output the optimization strategy corresponding to the object to be optimized.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method for evaluating the balancing capability of a battery system according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the method for evaluating the balancing capability of a battery system as claimed in any one of claims 1 to 8 are implemented.

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