Battery state monitoring and active equalization control method and system

Abstract

The invention provides a battery state monitoring and active equalization control method and system, and relates to the technical field of battery management, and the method comprises the steps: starting a timer to start timing from zero, and carrying out the communication with a plurality of sensors when a preset time step length is satisfied; performing voltage consistency analysis on the plurality of pieces of voltage monitoring time sequence information; performing charge state consistency analysis on the plurality of pieces of charge state monitoring time sequence information; when at least one of the voltage consistency identifier and the charge state consistency identifier is an inconsistent identifier, starting an equalization strategy; and after active equalization control is performed according to the energy transfer equalization strategy, returning to start process execution circulation. According to the battery management method and device, the technical problems that in the prior art, due to the fact that state monitoring needs to be carried out at each moment, the workload is large, and the efficiency is low can be solved, and the battery management efficiency is improved by rapidly recognizing the electric quantity difference between the single batteries and carrying out balancing through an energy transfer strategy.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a battery status monitoring and active balancing control method and system. Background Art

[0002] Battery status monitoring and active balancing control are important technical means to ensure the healthy operation of battery packs, extend the service life and improve safety. Battery status monitoring is responsible for obtaining and analyzing the real-time working status of each battery cell, including battery voltage, SOC, temperature, etc., to ensure that the battery operates within the normal working range and that the battery cell does not cause performance degradation or safety problems due to overcharging, overdischarging, overheating, etc. Active balancing control is mainly used in the battery pack. When the charge state of each battery cell is inconsistent, energy is transferred from the battery cell with high voltage or high SOC to the battery cell with low voltage or low SOC by energy transfer, so as to keep the voltage and SOC of each single cell in the battery pack consistent, which can not only improve the overall efficiency of the battery pack, but also extend the service life of the battery, and avoid premature damage of the single cell due to imbalance. Existing battery status monitoring and active balancing control methods usually require real-time monitoring of the battery status at each moment, that is, periodically collecting the voltage, SOC and other information of the battery cell at fixed time intervals, resulting in excessive calculation and storage burden, and generating a large amount of redundant data, which reduces processing efficiency.

[0003] In summary, the prior art has the technical problem of heavy workload and low efficiency due to the need to perform status monitoring at every moment. Summary of the invention

[0004] The purpose of this application is to provide a battery status monitoring and active balancing control method and system to solve the technical problems in the prior art that the workload is large and the efficiency is low due to the need to perform status monitoring at every moment.

[0005] In view of the above problems, the present application provides a battery status monitoring and active balancing control method and system.

[0006] In the first aspect, the present application provides a battery status monitoring and active balancing control method, which is implemented by a battery status monitoring and active balancing control system, wherein the battery status monitoring and active balancing control method includes: when the power battery starts to charge, start the timer from zero, and when the preset time step is met, communicate with a number of sensors deployed on a number of battery cells and receive a number of voltage monitoring timing information and a number of charge status monitoring timing information; process the several voltage monitoring timing information through a voltage consistency analysis component to obtain a voltage consistency identifier; process the several charge status monitoring timing information through a charge status consistency analysis component to obtain a charge status consistency identifier; when at least one of the voltage consistency identifier and the charge status consistency identifier is an inconsistent identifier, start the balancing strategy to perform energy transfer balancing optimization to obtain an energy transfer balancing strategy; after performing active balancing control according to the energy transfer balancing strategy, return to the start process execution loop.

[0007] In the second aspect, the present application also provides a battery status monitoring and active balancing control system for executing a battery status monitoring and active balancing control method as described in the first aspect, wherein the battery status monitoring and active balancing control system includes: a timing information receiving module, the timing information receiving module is used to start the timer from zero when the power battery starts charging, and when the preset time step is met, communicate with a number of sensors deployed on a number of battery cells and receive a number of voltage monitoring timing information and a number of charge status monitoring timing information; a voltage information processing module, the voltage information processing module is used to analyze the voltage consistency of the plurality of battery cells through a voltage consistency analysis component. The voltage monitoring timing information is processed to obtain a voltage consistency mark; a charge information processing module, the charge information processing module is used to process the plurality of charge state monitoring timing information through a charge state consistency analysis component to obtain a charge state consistency mark; an energy transfer balancing module, the energy transfer balancing module is used to start a balancing strategy to perform energy transfer balancing optimization when at least one of the voltage consistency mark and the charge state consistency mark is an inconsistent mark, and obtain an energy transfer balancing strategy; an active balancing control module, the active balancing control module is used to perform active balancing control according to the energy transfer balancing strategy, and then return to the start process execution loop.

[0008] One or more technical solutions provided in this application have at least the following technical effects or advantages: When the power battery starts to charge, the timer starts counting from zero. When the preset time step is met, it communicates with several sensors deployed on several battery cells and receives several voltage monitoring timing information and several charge state monitoring timing information; the voltage consistency analysis component processes the several voltage monitoring timing information to obtain the voltage consistency mark; the charge state consistency analysis component processes the several charge state monitoring timing information to obtain the charge state consistency mark; when at least one of the voltage consistency mark and the charge state consistency mark is an inconsistent mark, the balancing strategy is started to optimize the energy transfer balancing to obtain the energy transfer balancing strategy; after active balancing control is performed according to the energy transfer balancing strategy, the process execution loop is returned to the start. That is to say, by real-time monitoring of the voltage and charge state (SOC) information in the battery pack, and using consistency analysis and active balancing control strategies to optimize the performance of the battery pack, the energy transfer strategy is triggered when inconsistency is found to balance the power distribution of the battery pack, thereby achieving balanced management of the battery and improving the efficiency of battery management.

[0009] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are specifically cited below. It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0011] Figure 1 A flowchart of a battery status monitoring and active balancing control method for this application; Figure 2 This is a structural schematic diagram of a battery status monitoring and active balancing control system of the present application.

[0012] Explanation of the reference numerals: timing information receiving module 11 , voltage information processing module 12 , charge information processing module 13 , energy transfer balancing module 14 , active balancing control module 15 . DETAILED DESCRIPTION

[0013] This application provides a battery status monitoring and active balancing control method and system to solve the technical problem in the prior art that the workload is large and the efficiency is low due to the need to monitor the status at every moment. By real-time monitoring of the voltage and state of charge (SOC) information in the battery pack, and using consistency analysis and active balancing control strategies to optimize the performance of the battery pack, when inconsistencies are found, the energy transfer strategy is triggered to balance the power distribution of the battery pack, thereby achieving balanced management of the battery and improving the efficiency of battery management.

[0014] Below, the technical solutions in the present application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments of the present application. It should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. It should also be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, rather than all of them.

[0015] For example, please refer to the attached Figure 1 The present application provides a battery status monitoring and active balancing control method, wherein the battery status monitoring and active balancing control method is applied to a battery status monitoring and active balancing control system, and the battery status monitoring and active balancing control method specifically includes the following steps: S100: When the power battery starts to charge, the timer is started from zero. When the preset time step is met, it communicates with a plurality of sensors deployed on a plurality of battery cells and receives a plurality of voltage monitoring timing information and a plurality of charge state monitoring timing information.

[0016] Specifically, power batteries usually refer to large-capacity batteries used in applications such as electric vehicles, power tools, and renewable energy storage systems, such as lithium batteries, titanium iron batteries, etc., which need to have high energy density and a long service life. When the power battery starts to charge, the battery management system is started and the initialization timer starts from zero, which means that from the moment the battery starts charging, the timer will record the passage of time. A timer is a tool used to track the passage of time. In a battery monitoring system, the timer is used to record the start time and perform subsequent operations according to the set time step. The preset time step is a pre-set time interval, such as every 5 seconds, 10 seconds or longer, and data will be collected to monitor the battery status.

[0017] When the timer reaches the preset time step, the monitoring time is triggered to avoid data collection every moment, thereby reducing the burden on the system and ensuring the rationality and timeliness of the data. Communicate with the sensors deployed on the battery cells to collect the voltage and state of charge (SOC) information of the battery cells in real time. Sensors are devices used to detect and measure the state of battery cells (each individual battery in a battery pack). Common ones include voltage sensors, current sensors, temperature sensors, etc. Receive the voltage and charge state timing information uploaded by the sensor. The voltage timing information contains the change data of the battery voltage within a certain period of time, while the SOC timing information contains the change of the battery charge state.

[0018] Voltage monitoring timing information refers to the data of battery voltage changes over time, with the purpose of ensuring that the battery voltage does not exceed the set safety range during the charging and discharging process. State of charge (SOC) is an indicator of the current power of the battery, and SOC monitoring timing information refers to the data of battery power changes over time. By setting a reasonable time step, data collection is avoided at all times, the generation of redundant data is reduced, and the working efficiency of the battery management system is improved.

[0019] S200: Processing the plurality of voltage monitoring timing information by a voltage consistency analysis component to obtain a voltage consistency identifier.

[0020] S300: Processing the plurality of charge state monitoring time sequence information by a charge state consistency analysis component to obtain a charge state consistency identifier.

[0021] Specifically, the voltage consistency analysis component is used to analyze the voltage consistency of battery cells during the charging process to ensure that the voltage distribution of the battery is uniform and to avoid abnormal battery voltage, which may lead to unbalanced battery packs or battery damage. The voltage consistency analysis component contains multiple analysis channels, the end-point voltage consistency detection channel and the continuous-time consistency detection channel. The end-point voltage consistency detection channel is specifically used to analyze the consistency of the battery voltage at the end point (for example, charging is completed or at a critical time point) during the charging or discharging process; the continuous-time consistency detection channel is used to analyze the consistency of the battery voltage over a period of time, that is, whether the trend of the battery voltage over time remains consistent.

[0022] Extract several end-point voltage monitoring values ​​from several voltage monitoring timing information, that is, only extract the voltage monitoring value at the end point of each timing information. Through the end-point voltage consistency detection channel in the voltage consistency analysis component, the voltage value of the battery at the end of charging is detected for consistency, and the end-point voltage consistency mark is obtained. Through the continuous moment consistency detection channel in the voltage consistency analysis component, the entire several voltage monitoring timing information is monitored to obtain the continuous moment voltage consistency mark. The end-point voltage consistency mark and the continuous moment voltage consistency mark are merged into the final voltage consistency mark, which integrates the overall performance of the battery during the charging process, including the voltage consistency at the end point and the voltage change consistency throughout the process. For the specific detection process, please refer to the corresponding subsequent explanations, which will not be elaborated here.

[0023] The SOC consistency analysis component is used to process and analyze the SOC timing information of the battery. The SOC of a battery is an important parameter for measuring the remaining energy of the battery, which affects the efficiency and life of the battery. The SOC consistency analysis component determines whether the SOC (state of charge) of different batteries or battery cells is consistent. If the SOC of the batteries differ too much, some batteries may be exhausted prematurely while other batteries are still at a high state of charge, affecting the performance of the overall battery pack. Similar to the voltage consistency analysis, the SOC consistency analysis component processes the SOC timing information of the battery and analyzes the charge state change trend of different battery cells during charging or discharging.

[0024] The charge state consistency analysis component processes these charge state monitoring timing information, which usually involves analyzing the change trend of the charge state value over time. If the change trend is reasonable, the charge state consistency is marked as consistent; otherwise, it is inconsistent. The charge state consistency identification is obtained by jointly monitoring the end-time charge state consistency detection channel and the continuous time charge state consistency detection channel. By analyzing the voltage consistency and charge state consistency of the battery, overly frequent monitoring and data collection are avoided, thereby reducing the system's computing burden and storage pressure.

[0025] S400: When at least one of the voltage consistency identifier and the charge state consistency identifier is an inconsistent identifier, a balancing strategy is initiated to perform energy transfer balancing optimization to obtain an energy transfer balancing strategy.

[0026] Specifically, when it is detected that at least one of the voltage consistency mark or the charge state consistency mark of some battery cells in the battery pack is an inconsistent mark, the balancing strategy is started. The voltage consistency mark is an mark of the voltage consistency between battery cells, including a consistent mark and an inconsistent mark. If the voltage difference between the battery cells is small, the voltage consistency is considered to be good and marked as consistent; if the voltage difference between the battery cells is large, it is marked as inconsistent. The charge state consistency mark indicates the degree of matching of the state of charge (SOC) between the battery cells. If the SOC difference of the battery cells is small, it is marked as consistent; if the difference is large, it is marked as inconsistent. The state of charge (SOC) is an important indicator for measuring the remaining power of the battery.

[0027] Once it is detected that at least one battery cell in the battery pack has an inconsistent mark (that is, the voltage or charge state difference is too large), the balancing strategy will be activated. The goal of the balancing strategy is to minimize the voltage or SOC difference between battery cells by means of energy transfer. The scheme obtained by whether the inconsistent mark includes the inconsistent mark of the continuous moment is inconsistent. If the inconsistent mark of the continuous moment is not included, the random transfer allocation is performed according to the remaining power; conversely, if the inconsistent mark of the continuous moment is included, the energy transfer scheme is configured according to the remaining power timing information. The specific energy transfer balancing strategy acquisition process is explained in detail in the subsequent corresponding rights, so I will not go into details here. Here I will only introduce a general idea.

[0028] After the balancing strategy is started, energy transfer balancing optimization is performed, including determining the direction and amount of energy transfer, that is, determining which battery cells are used as energy supply batteries and which are used as energy receiving batteries, and the specific amount of transferred electricity. By dynamically adjusting the energy distribution of the battery pack according to the differences in the voltage and charge state of the battery cells, it can ensure that the energy distribution of the battery pack is more balanced and improve the working efficiency of the battery pack.

[0029] S500: After performing active balancing control according to the energy transfer balancing strategy, return to the start process execution loop.

[0030] Specifically, the energy transfer balancing strategy is a method used to address the uneven distribution of energy in the battery pack. It usually transfers energy from cells with higher battery voltage or charge state to cells with lower voltage or charge state to achieve the purpose of balancing the difference in electrical energy within the battery pack. It usually includes supplying batteries, receiving batteries, and the amount of electrical energy that needs to be transferred. The energy transfer balancing strategy determines which battery cells serve as energy suppliers and which serve as receivers. Active balancing control is to regulate the energy flow between battery cells based on the differences in voltage and charge state of the battery cells in the battery pack through external control means. Through active balancing, excess energy can be transferred from battery cells to other battery cells to improve the overall efficiency of the battery pack. Unlike passive balancing, active balancing does not consume excess energy, but transfers it to other battery cells to avoid waste.

[0031] Once the energy transfer balancing strategy is executed, it will not stop working, but will return to the initial monitoring stage to continue to detect the voltage and charge state of the battery cells. This execution process is a closed loop that is repeated continuously to cope with the dynamic changes in the battery state. As time goes by and the charging process proceeds, the voltage and charge state of the battery cells will continue to change, so it is necessary to continuously monitor and adjust the balancing strategy according to the new state. By continuously executing the balancing strategy and returning to the execution loop, adapting to the changes in the battery state, adjusting the energy distribution between the battery cells in real time, ensuring that the battery pack always maintains the best working state during the entire use process, improving the efficiency of the battery pack, extending the battery life, and reducing the safety risks and performance losses caused by inconsistent battery cells. By repeatedly executing energy transfer balancing control and making adjustments in real time according to the voltage and charge state of the battery cells, it is ensured that the energy distribution between the battery cells inside the battery pack is always in the optimal state, maximizing the charging and discharging efficiency of the battery pack, and avoiding losses caused by excessive charging and discharging of the battery.

[0032] Further, the present application S200 includes: The voltage consistency analysis component includes an endpoint voltage consistency detection channel and a continuous moment consistency detection channel; extracts a plurality of endpoint voltage monitoring values ​​of the plurality of voltage monitoring timing information; detects the plurality of endpoint voltage monitoring values ​​through the endpoint voltage consistency detection channel to obtain an endpoint voltage consistency identifier; detects the plurality of voltage monitoring timing information through the continuous moment consistency detection channel to obtain a continuous moment voltage consistency identifier; adds the endpoint voltage consistency identifier and the continuous moment voltage consistency identifier into the voltage consistency identifier.

[0033] Specifically, the voltage consistency analysis component is used to analyze the voltage consistency of battery cells during the charging process, including the end-point voltage consistency detection channel and the continuous-time consistency detection channel, to ensure that the voltage distribution of the battery is uniform and avoid abnormal battery voltage, which may lead to unbalanced battery packs or battery damage. The end-point voltage consistency detection channel is used to detect whether the voltage of the battery cells is consistent at a specific moment (such as the end of charging or discharging); the continuous-time voltage consistency detection channel is used to detect whether the voltage of the battery cells is consistent over a period of time (such as during charging).

[0034] The monitoring time series data of the battery voltage over a period of time is extracted from the sensors deployed on the battery cells, including the voltage values ​​at different time points. For each voltage monitoring time series information, the voltage monitoring values ​​at key moments are specially extracted, that is, several end-point voltage monitoring values. The end-point voltage consistency detection channel is used to perform consistency detection on the voltage value of the battery at the end of charging.

[0035] Through the endpoint voltage consistency detection channel, the extracted endpoint voltage monitoring values ​​are compared to determine whether the battery cell voltage is consistent. Determine the voltage difference between different batteries. If the endpoint voltage difference of the battery is large, it means that the voltage between the batteries is inconsistent, and further equalization optimization is required. The endpoint voltage consistency mark is marked as an inconsistent mark. If the voltage difference is small, it can be considered that the battery voltage is consistent, and the endpoint voltage consistency mark is marked as a consistent mark.

[0036] The voltage monitoring timing information of the battery is detected through the continuous moment consistency detection channel to determine whether the voltage change trend of the battery is consistent throughout the process. Input several voltage monitoring timing information into the continuous moment consistency detection channel to evaluate the voltage change of the battery at different time points and detect whether the charging or discharging curve of the battery is smooth. If the change trends of several voltage monitoring timing information are mostly the same, it means that the battery exhibits consistent charging and discharging characteristics, and the continuous moment voltage consistency mark is marked as consistent. When the change trends of several voltage monitoring timing information are mostly different, it means that there are differences in the charging and discharging characteristics of the battery, and the continuous moment voltage consistency mark is marked as inconsistent.

[0037] After completing the above two consistency tests, the endpoint voltage consistency mark and the continuous moment voltage consistency mark are merged into the final voltage consistency mark. The overall performance of the battery during the charging process is integrated, including the voltage consistency at the endpoint and the voltage change consistency throughout the process. By combining the endpoint voltage consistency and the continuous moment voltage consistency, the consistency of the battery voltage is comprehensively evaluated to avoid relying solely on data at a certain moment to judge the consistency of the battery, thereby improving the accuracy of the test results. Comprehensively evaluate the consistency of the battery at multiple moments to accurately identify the differences between batteries. Based on the consistency mark, timely adjust the balancing strategy to transfer energy from high-voltage batteries to low-voltage batteries, ensure balanced charging of the battery pack, and improve the service life and safety of the battery.

[0038] Furthermore, the present application also includes the following steps: Calculate the variance values ​​of the voltage monitoring values ​​at the endpoints to obtain a voltage consistency coefficient; when the voltage consistency coefficient is greater than or equal to a consistency coefficient threshold, configure the voltage consistency flag at the endpoint as an inconsistent flag; otherwise, configure the voltage consistency flag at the endpoint as a consistent flag.

[0039] Specifically, the variance values ​​of several voltage monitoring values ​​at the end point are calculated. The variance of the voltage monitoring values ​​at the end point refers to the degree of difference between the voltage values ​​of each battery at the end of the charging process (i.e., the end point). The larger the variance, the greater the voltage difference between the batteries, and the worse the voltage consistency of the battery pack. Variance is an indicator used to measure the degree of dispersion of a set of data distributions, indicating the difference between the data value and its average value. Based on the voltage variance, the voltage consistency coefficient is calculated. The voltage consistency coefficient is an indicator for evaluating the consistency of battery voltage based on the calculated variance value. The voltage consistency coefficient reflects the degree of consistency of the battery pack voltage. The voltage consistency coefficient is usually directly related to the voltage variance of the batteries in the battery pack: if the voltage variance is small, the voltage consistency coefficient is high, indicating poor battery consistency; if the variance is large and the coefficient is low, the battery consistency is poor.

[0040] The consistency coefficient threshold is a preset standard value used to determine whether the battery pack voltage is consistent. If the calculated voltage consistency coefficient is greater than or equal to the threshold, the battery voltage is considered consistent; otherwise, the battery voltage is considered inconsistent. By comparing the voltage consistency coefficient with the preset consistency coefficient threshold, it is determined whether the voltage of the battery pack is consistent. If the calculated voltage consistency coefficient is greater than or equal to the consistency coefficient threshold, the voltage difference between the battery cells is large, and the voltage consistency flag at the end moment is set to an inconsistent flag. If the voltage consistency coefficient is less than the consistency coefficient threshold, it means that the voltage difference between the surface battery cells is small, and the voltage consistency flag at the end moment is configured as a consistent flag. By calculating the variance value of the battery cell voltage at the end moment, the voltage consistency of the battery pack is quickly evaluated to reduce the real-time calculation burden of the battery management system, instead of frequently monitoring the voltage of each battery at each moment.

[0041] Furthermore, the present application also includes the following steps: Collect a number of voltage recording time series information of a number of batteries of the same power battery; count a number of groups of voltage change step sequences of the said number of voltage recording time series information; when at least a preset proportion of the step change trends of the said number of voltage change step sequences are the same, mark the said number of voltage recording time series information consistently; otherwise, when at least a preset proportion of the step change trends of the said number of voltage change step sequences are different, mark the said number of voltage recording time series information inconsistently; use the said consistent mark or the said inconsistent mark as supervision and the said number of voltage recording time series information as input to train the said continuous moment consistency detection channel.

[0042] Specifically, the voltage data of multiple battery cells of the same power battery at different time points are collected to obtain a number of voltage recording time series information, that is, the voltage data sequence of each battery cell is measured and recorded within a certain time interval. The voltage recording time series information is a time series that reflects the voltage change of the battery during the charging and discharging process. For the voltage recording time series information of each battery, the change step length between each two adjacent voltage values ​​is calculated. The voltage change step length sequence refers to the change amount of the battery voltage in each time step in the voltage recording time series information.

[0043] The preset ratio number refers to how many ratios have the same or different change trends among multiple voltage change step sequences. It is usually a pre-set number used to determine whether the number of steps with the same change trend is large enough. At least a preset ratio of step change trends in several groups of voltage change step sequences are the same. When multiple step change trends are the same among several groups of voltage change step sequences, the several voltage recording timing information are consistently marked. In other words, when the change trends of several voltage recording timing information are mostly the same, it means that the battery exhibits consistent charge and discharge characteristics and is marked as consistent.

[0044] On the contrary, when at least a preset proportion of the step change trends of several groups of voltage change step sequences are different, the several voltage recording time series information are marked as inconsistent. That is to say, when the change trends of several voltage recording time series information are mostly different, it means that there are differences in the charging and discharging characteristics of the battery, which are marked as inconsistent. Use the consistency mark (consistent or inconsistent) as the supervision signal and the voltage recording time series information as input to train the continuous moment consistency detection channel. Use a set of input data (battery voltage recording time series information) and the corresponding output label (such as consistent mark or inconsistent mark) for training.

[0045] The continuous moment consistency detection channel receives the battery voltage recording time series information and attaches the consistent mark or inconsistent mark corresponding to each battery voltage recording time series information according to the previous analysis. Several voltage recording time series information reflect the voltage change of the battery at different time points and contain important information about the working status of the battery. The continuous moment consistency detection channel in the model is trained using the battery voltage recording time series information and its corresponding mark (consistent or inconsistent). Through supervised learning, the model will gradually optimize its internal parameters. Whenever the battery voltage timing information is input into the model, the model will adjust its parameters according to the existing mark (such as consistent or inconsistent). The training process uses various optimization algorithms (such as gradient descent) to gradually reduce the error of the model. The specific optimization process is as follows: calculate the loss between the current model output and the actual label through forward propagation; use the back propagation algorithm to calculate the gradient of the loss function relative to the model parameters; use the gradient descent method to adjust the parameters of the model according to the calculated gradient, so that the loss value is gradually reduced and the prediction ability of the model is improved. Repeat the above steps until the loss function converges or reaches the preset number of training rounds.

[0046] By counting and analyzing the voltage change step sequence, we avoid comprehensive monitoring of the voltage at each moment. By using the trend analysis of the voltage change step sequence, we can quickly judge the voltage consistency between multiple batteries. By judging the battery consistency, we can promptly find the inconsistency in the battery pack, optimize the charging process, and start the balancing strategy to ensure that the voltage difference between the batteries in the battery pack is minimized and the service life of the battery pack is improved. By continuously training the consistency detection channel, it can gradually identify complex battery voltage change patterns, further improving its judgment accuracy and intelligence level.

[0047] Further, the present application S400 includes: When the inconsistency mark only includes the inconsistent mark of the end time, a number of remaining powers of a number of battery cells are obtained; random transfer and distribution are performed based on the several remaining powers to obtain an energy transfer scheme; when the energy transfer scheme voltage consistency mark and the energy transfer scheme charge state consistency mark are both consistent marks, the energy transfer scheme is set to the energy transfer balancing strategy.

[0048] Specifically, if the inconsistency mark only includes the inconsistent mark of the end time, that is, only the final time is inconsistent, then several remaining capacities of several battery cells are obtained. By real-time monitoring of battery parameters such as voltage and temperature, combined with the performance characteristics of the battery, the power state of each battery cell is estimated. By analyzing several remaining capacities of several battery cells, a random transfer allocation energy transfer plan is formulated. According to the difference in the remaining power of the battery, it is decided how to transfer power from the battery with higher power to the battery with lower power to achieve balance.

[0049] Random transfer allocation is a strategy that automatically determines battery energy transfer based on the difference in remaining power between battery cells. It randomly determines which batteries transfer power to other batteries based on the remaining power of the batteries. The purpose is to achieve balance between battery cells through energy transfer. The energy transfer scheme refers to a specific battery management strategy formed by adjusting the energy distribution between battery cells. It defines how to transfer power from one battery cell to another, thereby achieving balance between battery cells in the battery pack.

[0050] After the energy transfer scheme is generated, the voltage consistency and charge state consistency of each battery cell are detected. Only when the voltage and charge state of the battery cell meet the consistent conditions, the energy transfer scheme will be adopted as the final balancing strategy. When the energy transfer scheme that has passed the evaluation satisfies the voltage consistency and charge state consistency marks are both consistent marks, the scheme is established as the final energy transfer balancing strategy, and the energy transfer operation is performed. In a battery pack, inconsistent battery cells will affect the overall performance of the battery pack. Through energy transfer balancing, the negative impact of this inconsistency on performance is reduced. By optimizing the energy transfer scheme, the voltage and charge state of the battery cells are balanced, thereby improving the efficiency of the entire battery pack.

[0051] Furthermore, the present application also includes the following steps: When the inconsistency flag includes a continuous moment inconsistency flag, obtain a number of remaining power timing information; based on the several remaining power timing information, configure a continuous moment energy transfer scheme; based on the continuous moment energy transfer scheme, perform a balancing analysis on the several voltage monitoring timing information and the several charge state monitoring timing information to obtain a voltage consistency update flag and a charge state consistency update flag; when the continuous moment consistency flags of the voltage consistency update flag and the charge state consistency update flag are both consistent flags, set the energy transfer balancing strategy for the future preset time step according to the continuous moment energy transfer scheme.

[0052] Specifically, if the inconsistency mark includes a continuous moment inconsistency mark, it indicates that the voltage or charge state of the battery cell is inconsistent at multiple consecutive time points, and the remaining power timing information of the battery cell during the entire charging or discharging process is collected. The remaining power timing information refers to the record of changes in the remaining power of the battery cell over a period of time, reflecting the trend of power changes in the battery cell over a period of time. According to a number of remaining power timing information, the power difference between the battery cells is analyzed, and a continuous moment energy transfer plan is generated according to the battery charging state. The continuous moment energy transfer plan refers to an energy transfer plan calculated based on the remaining power timing information of the battery cell in a continuous time period, which specifies how to transfer energy from batteries with higher power to batteries with lower power to optimize the overall power balance of the battery pack.

[0053] After configuring the energy transfer scheme for continuous moments, a balancing analysis is performed on several voltage monitoring timing information and several charge state monitoring timing information to evaluate whether the voltage consistency and charge state consistency of the battery cells are improved. If the balancing result shows that the differences in battery voltage and charge state in the battery pack meet the preset standards, the voltage consistency update flag and the charge state consistency update flag are updated to the consistent flag.

[0054] When the equalization analysis results show that the voltage consistency update flag and the charge state consistency update flag are both consistent flags, an energy transfer equalization strategy with a future preset time step is set according to the continuous moment energy transfer scheme, and this strategy is executed to further optimize the state of the battery pack. The future preset time step refers to a fixed time interval pre-set in the battery state monitoring and balancing control system, which is used to plan the next monitoring and control operation, and is determined according to the battery's charging and discharging characteristics, the system's processing capabilities, and the required monitoring accuracy. By analyzing the remaining power timing information and optimizing the energy transfer scheme based on this, the voltage and SOC of the battery cells in the battery pack can be better balanced, avoiding overcharging or over-discharging of certain battery cells. By continuously monitoring and adjusting the voltage and SOC of the battery cells, system failures or performance degradation caused by battery inconsistency can be effectively avoided, thereby extending the battery life and improving the overall performance of the battery pack.

[0055] Furthermore, the present application S500 includes: The energy transfer balancing strategy includes an energy supply battery, an energy receiving battery and an energy transfer amount; a capacitor is connected to the energy supply battery, and energy storage is performed based on the energy transfer amount; when energy storage is completed, the capacitor is connected to the energy receiving battery, and energy transfer control is performed based on the energy transfer amount.

[0056] Specifically, the energy transfer balancing strategy refers to achieving consistency in voltage and charge state between battery cells through energy transfer within the battery pack, which involves selecting appropriate batteries (energy supply batteries and energy receiving batteries) and calculating and controlling the amount of energy transferred. Its purpose is to optimize the overall state of the battery pack, balance the energy between batteries, and avoid overcharging or discharging of some battery cells. In the energy balancing process of the battery pack, the energy supply battery and the energy receiving battery are determined. The energy supply battery refers to the battery with more power, while the energy receiving battery is the battery with less power.

[0057] Energy supply battery refers to the battery cell responsible for providing energy in the energy transfer balancing strategy. When the battery is in a charging state or has excess power, it needs to transfer part of the energy to other batteries to balance the energy distribution of the battery pack. Energy receiving battery refers to the battery cell responsible for receiving energy in the energy transfer balancing strategy. When the battery is in a discharging state or has insufficient power, it needs to receive energy from other batteries to restore its power.

[0058] Connecting a capacitor to an energy supply battery temporarily stores energy from the energy supply battery in the capacitor, effectively regulating the energy transfer process so that the energy will not be unstable during the transfer process due to differences in battery characteristics. The amount of energy transferred refers to the amount of electricity that needs to be transferred from the energy supply battery to the energy receiving battery in the energy transfer balancing strategy. The capacitor is used here as an energy storage element, playing the role of temporary energy storage during the energy transfer process, collecting and storing energy from the energy supply battery, and then transferring the energy to the energy receiving battery. The characteristic of the capacitor is that it can be charged and discharged quickly, so it is suitable for efficient energy transfer in a short time.

[0059] When the capacitor has completed energy storage, it will be connected to the energy receiving battery to control the energy transfer process. The capacitor releases the stored energy and transfers the energy to the target battery (i.e., the energy receiving battery) through the control system in the battery pack, ensuring that the energy difference between the battery cells is effectively regulated. During the energy transfer process, the energy exchange between the capacitor and the battery is precisely controlled according to the energy that needs to be transferred (i.e., the amount of energy transferred). The transfer amount is usually calculated by the balancing strategy based on the difference in charge state. The control process needs to ensure that after each transfer, the voltage and charge state differences of the battery pack tend to be consistent. Through the energy transfer balancing strategy, the voltage and SOC differences of the battery cells in the battery pack can be effectively balanced, avoiding the phenomenon of overcharging or over-discharging of some battery cells, thereby extending the service life of the battery pack.

[0060] In summary, the battery status monitoring and active balancing control method provided by the present application has the following technical effects: When the power battery starts to charge, the timer starts counting from zero. When the preset time step is met, it communicates with several sensors deployed on several battery cells and receives several voltage monitoring timing information and several charge state monitoring timing information; the voltage consistency analysis component processes the several voltage monitoring timing information to obtain the voltage consistency mark; the charge state consistency analysis component processes the several charge state monitoring timing information to obtain the charge state consistency mark; when at least one of the voltage consistency mark and the charge state consistency mark is an inconsistent mark, the balancing strategy is started to optimize the energy transfer balancing to obtain the energy transfer balancing strategy; after active balancing control is performed according to the energy transfer balancing strategy, the process execution loop is returned to the start. That is to say, by real-time monitoring of the voltage and charge state (SOC) information in the battery pack, and using consistency analysis and active balancing control strategies to optimize the performance of the battery pack, the energy transfer strategy is triggered when inconsistency is found to balance the power distribution of the battery pack, thereby achieving balanced management of the battery and improving the efficiency of battery management.

[0061] Embodiment 2: Based on the same inventive concept as the battery status monitoring and active balancing control method in the aforementioned embodiment 1, the present application also provides a battery status monitoring and active balancing control system, please refer to the attached Figure 2 , the battery status monitoring and active balancing control system comprises: A timing information receiving module 11, wherein the timing information receiving module 11 is used to start the timer from zero when the power battery starts to charge, and when the preset time step is met, communicate with a number of sensors deployed on a number of battery cells and receive a number of voltage monitoring timing information and a number of charge state monitoring timing information; a voltage information processing module 12, wherein the voltage information processing module 12 is used to process the several voltage monitoring timing information through a voltage consistency analysis component to obtain a voltage consistency identifier; a charge information processing module 13, wherein the charge information processing module 13 is used to process the several charge state monitoring timing information through a charge state consistency analysis component to obtain a charge state consistency identifier; an energy transfer balancing module 14, wherein the energy transfer balancing module 14 is used to start a balancing strategy to perform energy transfer balancing optimization and obtain an energy transfer balancing strategy when at least one of the voltage consistency identifier and the charge state consistency identifier is an inconsistent identifier; an active balancing control module 15, wherein the active balancing control module 15 is used to perform active balancing control according to the energy transfer balancing strategy, and then return to the start process execution loop.

[0062] Furthermore, the voltage information processing module 12 in the battery status monitoring and active balancing control system is also used for: The voltage consistency analysis component includes an endpoint voltage consistency detection channel and a continuous moment consistency detection channel; extracts a plurality of endpoint voltage monitoring values ​​of the plurality of voltage monitoring timing information; detects the plurality of endpoint voltage monitoring values ​​through the endpoint voltage consistency detection channel to obtain an endpoint voltage consistency identifier; detects the plurality of voltage monitoring timing information through the continuous moment consistency detection channel to obtain a continuous moment voltage consistency identifier; adds the endpoint voltage consistency identifier and the continuous moment voltage consistency identifier into the voltage consistency identifier.

[0063] Furthermore, the voltage information processing module 12 in the battery status monitoring and active balancing control system is also used for: Calculate the variance values ​​of the voltage monitoring values ​​at the endpoints to obtain a voltage consistency coefficient; when the voltage consistency coefficient is greater than or equal to a consistency coefficient threshold, configure the voltage consistency flag at the endpoint as an inconsistent flag; otherwise, configure the voltage consistency flag at the endpoint as a consistent flag.

[0064] Furthermore, the voltage information processing module 12 in the battery status monitoring and active balancing control system is also used for: Collect a number of voltage recording time series information of a number of batteries of the same power battery; count a number of groups of voltage change step sequences of the said number of voltage recording time series information; when at least a preset proportion of the step change trends of the said number of voltage change step sequences are the same, mark the said number of voltage recording time series information consistently; otherwise, when at least a preset proportion of the step change trends of the said number of voltage change step sequences are different, mark the said number of voltage recording time series information inconsistently; use the said consistent mark or the said inconsistent mark as supervision and the said number of voltage recording time series information as input to train the said continuous moment consistency detection channel.

[0065] Furthermore, the energy transfer balancing module 14 in the battery state monitoring and active balancing control system is also used for: When the inconsistency mark only includes the inconsistent mark of the end time, a number of remaining powers of a number of battery cells are obtained; random transfer and distribution are performed based on the several remaining powers to obtain an energy transfer scheme; when the energy transfer scheme voltage consistency mark and the energy transfer scheme charge state consistency mark are both consistent marks, the energy transfer scheme is set to the energy transfer balancing strategy.

[0066] Furthermore, the energy transfer balancing module 14 in the battery state monitoring and active balancing control system is also used for: When the inconsistency flag includes a continuous moment inconsistency flag, obtain a number of remaining power timing information; based on the several remaining power timing information, configure a continuous moment energy transfer scheme; based on the continuous moment energy transfer scheme, perform a balancing analysis on the several voltage monitoring timing information and the several charge state monitoring timing information to obtain a voltage consistency update flag and a charge state consistency update flag; when the continuous moment consistency flags of the voltage consistency update flag and the charge state consistency update flag are both consistent flags, set the energy transfer balancing strategy for the future preset time step according to the continuous moment energy transfer scheme.

[0067] Furthermore, the active balancing control module 15 in the battery status monitoring and active balancing control system is also used for: The energy transfer balancing strategy includes an energy supply battery, an energy receiving battery and an energy transfer amount; a capacitor is connected to the energy supply battery, and energy storage is performed based on the energy transfer amount; when energy storage is completed, the capacitor is connected to the energy receiving battery, and energy transfer control is performed based on the energy transfer amount.

[0068] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. Figure 1 The battery status monitoring and active balancing control method and specific examples in the first embodiment are also applicable to the battery status monitoring and active balancing control system of the present embodiment. Through the above detailed description of the battery status monitoring and active balancing control method, those skilled in the art can clearly know the battery status monitoring and active balancing control system of the present embodiment, so for the sake of brevity of the specification, it will not be described in detail here. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0069] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0070] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the present application and its equivalent technology, the present application is also intended to include these modifications and variations.

Claims

1. A battery status monitoring and active balancing control method, characterized in that: include: When the power battery starts to charge, the timer starts counting from zero. When the preset time step is met, it communicates with a plurality of sensors deployed on a plurality of battery cells and receives a plurality of voltage monitoring timing information and a plurality of charge state monitoring timing information; Processing the plurality of voltage monitoring timing information by a voltage consistency analysis component to obtain a voltage consistency identifier; Processing the plurality of charge state monitoring time sequence information by a charge state consistency analysis component to obtain a charge state consistency identifier; When at least one of the voltage consistency identifier and the charge state consistency identifier is an inconsistent identifier, starting a balancing strategy to perform energy transfer balancing optimization to obtain an energy transfer balancing strategy; After active balancing control is performed according to the energy transfer balancing strategy, the process execution loop is returned to the start.

2. A battery status monitoring and active balancing control method as claimed in claim 1, characterized in that: The voltage consistency analysis component includes an endpoint voltage consistency detection channel and a continuous time consistency detection channel. The voltage consistency analysis component processes the plurality of voltage monitoring timing information to obtain a voltage consistency identifier, including: Extracting voltage monitoring values ​​at a plurality of end points of the plurality of voltage monitoring time sequence information; The plurality of endpoint voltage monitoring values ​​are detected through the endpoint voltage consistency detection channel to obtain an endpoint voltage consistency identifier; Through the continuous moment consistency detection channel, the plurality of voltage monitoring timing information are detected to obtain a continuous moment voltage consistency mark; The end-time voltage consistency mark and the continuous-time voltage consistency mark are added to the voltage consistency mark.

3. A battery status monitoring and active balancing control method as claimed in claim 2, characterized in that: The plurality of endpoint voltage monitoring values ​​are detected through the endpoint voltage consistency detection channel to obtain an endpoint voltage consistency identifier, including: Calculating the variance of the voltage monitoring values ​​at the plurality of endpoints to obtain a voltage consistency coefficient; When the voltage consistency coefficient is greater than or equal to a consistency coefficient threshold, configuring the end-time voltage consistency flag as an inconsistent flag; Otherwise, the endpoint voltage consistency mark is configured as a consistency mark.

4. A battery status monitoring and active balancing control method as claimed in claim 2, characterized in that: The plurality of voltage monitoring timing information are detected through the continuous moment consistency detection channel to obtain a continuous moment voltage consistency identifier, which includes: Collecting multiple voltage record timing information of multiple batteries of the same power battery; Counting a plurality of groups of voltage change step length sequences of the plurality of voltage recording time sequence information; When at least a preset proportion of the step length change trends of the plurality of groups of voltage change step length sequences are the same, the plurality of voltage recording time sequence information are consistently marked; Otherwise, when at least a preset proportion of the step change trends of the plurality of groups of voltage change step sequences are different, an inconsistency mark is performed on the plurality of voltage record time sequence information; The continuous moment consistency detection channel is trained by taking the consistent mark or the inconsistent mark as supervision and the plurality of voltage record timing information as input.

5. The battery status monitoring and active balancing control method according to claim 1, characterized in that: Start the balance strategy to optimize the energy transfer balance and obtain the energy transfer balance strategy, including: When the inconsistency mark only includes the endpoint time inconsistency mark, obtaining a plurality of remaining capacities of a plurality of battery cells; Performing random transfer allocation based on the plurality of remaining electric quantities to obtain an energy transfer scheme; When the energy transfer scheme voltage consistency flag and the energy transfer scheme charge state consistency flag are both consistent flags, the energy transfer scheme is set to the energy transfer balancing strategy.

6. A battery status monitoring and active balancing control method as claimed in claim 5, characterized in that: Start the balance strategy to optimize the energy transfer balance and obtain the energy transfer balance strategy, including: When the inconsistency flag includes a continuous time inconsistency flag, obtaining a plurality of remaining power time sequence information; Based on the plurality of remaining power time series information, configuring a continuous moment energy transfer scheme; Based on the continuous moment energy transfer scheme, performing a balance analysis on the plurality of voltage monitoring timing information and the plurality of charge state monitoring timing information to obtain a voltage consistency update flag and a charge state consistency update flag; When the continuous moment consistency flags of the voltage consistency update flag and the charge state consistency update flag are both consistent flags, an energy transfer balancing strategy for a future preset time step is set according to the continuous moment energy transfer scheme.

7. A battery status monitoring and active balancing control method as claimed in claim 1, characterized in that: Active balancing control is performed according to the energy transfer balancing strategy, including: The energy transfer balancing strategy includes an energy supply battery, an energy receiving battery and an energy transfer amount; connecting a capacitor to the energy supply battery to store energy based on the amount of energy transfer; When energy storage is completed, the capacitor is connected to the energy receiving battery, and energy transfer control is performed based on the energy transfer amount.

8. A battery status monitoring and active balancing control system, characterized in that: Steps for implementing a battery status monitoring and active balancing control method as described in any one of claims 1 to 7, wherein the battery status monitoring and active balancing control system comprises: A timing information receiving module, wherein the timing information receiving module is used to start the timer from zero when the power battery starts to be charged, and when a preset time step is met, communicate with a plurality of sensors deployed on a plurality of battery cells and receive a plurality of voltage monitoring timing information and a plurality of charge state monitoring timing information; A voltage information processing module, the voltage information processing module is used to process the plurality of voltage monitoring timing information through a voltage consistency analysis component to obtain a voltage consistency identifier; A charge information processing module, the charge information processing module is used to process the plurality of charge state monitoring time sequence information through a charge state consistency analysis component to obtain a charge state consistency identifier; An energy transfer balancing module, wherein the energy transfer balancing module is used to start a balancing strategy to perform energy transfer balancing optimization when at least one of the voltage consistency identifier and the charge state consistency identifier is an inconsistent identifier, so as to obtain an energy transfer balancing strategy; An active balancing control module is used to perform active balancing control according to the energy transfer balancing strategy and then return to the start process execution loop.

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