Lithium battery intelligent rapid charging system and charging method thereof

Abstract

The invention discloses a lithium battery intelligent rapid charging system and a charging method thereof.The lithium battery intelligent rapid charging method comprises the following steps that S1, a lithium battery is charged through a charger; s2, switching a power supply mode; s3, detection of charging switching; s4, processing the data information obtained by detection; s5, reverse control adjustment is carried out; s6, performing safety protection and early warning; and S7, carrying out optimization processing on the data. The system has the advantages that fluctuation of voltage or current is eliminated, the PID control unit can conveniently switch charging modes, charging safety of the battery is ensured, the service life of the battery is prolonged, historical data information is analyzed and processed, the battery management system can optimize and adjust the charging process, and optimization suggestions and predictive maintenance are provided.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery charging, and more specifically, particularly relates to a lithium battery intelligent fast charging system. At the same time, the present invention also relates to a lithium battery intelligent fast charging method. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Due to the highly active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream.

[0003] Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain metallic lithium and are rechargeable.

[0004] Consumers have increasing requirements for battery power. People hope to reduce weight as much as possible while obtaining large-capacity power, and improve the efficiency and life of the entire power system. The lithium battery intelligent management system can realize intelligent monitoring, control and management of the battery charging and discharging process, improve the battery power factor, and has positive significance for energy saving and improving energy utilization. It can truly reflect the "green" power conversion and has a high use value.

[0005] However, the disadvantage of lithium batteries is that they have strict requirements on chargers and high requirements on protection circuits. The required charging method is constant current and constant voltage. In order to effectively utilize the battery capacity, the lithium-ion battery needs to be charged to the maximum voltage, but overvoltage charging will cause battery damage, which requires higher control accuracy. In addition, batteries with too low voltage need to be pre-charged, and charging termination detection needs to be performed in addition to voltage detection. Other auxiliary methods are also needed as backup measures to prevent overcharging, such as detecting battery temperature, limiting charging time, and providing additional protection for the battery.

[0006] The battery management system can monitor the battery status, charging and discharging process, temperature and health status, thereby improving the battery performance and extending its life. The intelligent controller is a hardware device used to control the battery system, which can perform intelligent charging and discharging control according to the battery status and needs. The combination of the two can effectively manage and optimize the performance of the battery system, improve energy efficiency, reduce energy waste, and provide a more reliable and safe battery system.

[0007] However, there are some problems with the existing technology: the existing battery management system is easily affected by voltage fluctuations when detecting various parameters of the lithium battery, causing the battery management system to stop charging or switch the charging mode, affecting the charging process of the lithium battery, and the existing charging process directly uses a set threshold to switch the charging mode, or cuts off the power supply process, which cannot effectively achieve precise control of fast charging. Therefore, we propose a lithium battery intelligent fast charging system and a charging method thereof. Summary of the invention

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide a lithium battery intelligent fast charging system and a charging method thereof, which can control and adjust the fast charging process of the lithium battery through a PID control unit, and when performing PID control and adjustment, eliminate the influence of fluctuations in charging voltage or current by combining parameter information, thereby controlling and adjusting the fast charging process and optimizing the fast charging process of the lithium battery. To achieve the above purpose, the present invention provides the following technical solutions: In a first aspect, a lithium battery intelligent fast charging system includes a battery management system, wherein the battery management system includes a charger, a detection unit, a preset unit, a communication unit, a data unit, a PID control unit and a data management unit; The charger is used to power the lithium battery, and the charger includes an electromagnetic switch, a constant current circuit and a constant voltage circuit. The electromagnetic switch is used to control the switching of the constant current circuit and the constant voltage circuit. The constant current circuit and the constant voltage circuit are used to control the constant current or constant voltage mode of the charging process. The charger also includes a voltage regulating module, and the voltage regulating module is used to adjust the voltage of the mains grid; The detection unit is used to detect various parameters of the lithium battery. The detection unit includes a voltage detection circuit for detecting the charging and discharging voltage of the lithium battery, a current detection circuit for detecting the charging and discharging current of the lithium battery, a battery capacity detection circuit for detecting the capacity of the lithium battery, and a temperature sensor for detecting the temperature of the battery; The preset unit is used to set the charging and discharging parameters of the lithium battery, so that the battery management system can adjust and control the charging and discharging process of the lithium battery according to the set parameter information; The data unit is used to analyze and process the data information collected by the detection unit to facilitate the subsequent use of the data information. The data unit includes receiving the data information, converting the data information, amplifying the data information, filtering the data information and cleaning the data information; The PID control unit is used to control the charging and discharging process of the lithium battery according to the collected data information. The PID control unit obtains the data information processed by the data unit and controls the charger to charge the lithium battery by reverse regulation, that is, the PID control unit switches and regulates the constant current circuit and the constant voltage circuit according to the collected voltage information; The calculation formula of the PID control unit is as follows: ,in, is the output of the controller, is the system error, is the proportional gain coefficient, is the integral gain coefficient, is the differential gain coefficient, is the integral part of the error, is the differential part of the error; in, The calculation of is as follows: , seek the middle is the set voltage value, is the actual measured voltage value, where The average value algorithm is used to eliminate the influence of voltage fluctuation peak value, that is, the actual measured voltage acquisition is segmented into time segments, and the time interval is set to 1ms. The calculation of is as follows: ; Where t is the calculation time point, t-1 and t+1 are the two time points before and after the calculation time point respectively; The voltage detection circuit, the current detection circuit, the battery capacity detection circuit and the temperature sensor in the detection unit are all reversely regulated and controlled by the PID control unit.

[0009] Optionally, the voltage regulating module includes a step-down circuit for converting the high voltage of the municipal power grid into a low voltage, the voltage regulating module includes a rectifier circuit for converting the AC voltage into a DC voltage, the voltage regulating module includes a voltage stabilizing circuit for outputting a stable power supply voltage, and the voltage regulating module includes a filtering circuit for eliminating the AC voltage in the DC voltage.

[0010] Optionally, the electromagnetic switch is a three-way output switch, the input end of the electromagnetic switch is electrically connected to the output end of the voltage regulating module, the two outputs of the electromagnetic switch are electrically connected to the constant current circuit and the constant voltage circuit respectively, and the middle output path of the electromagnetic switch is a circuit breaker, which is used to open the circuit after the charging reaches a predetermined voltage.

[0011] Optionally, the preset unit includes a current parameter for charging , Voltage parameters , Temperature parameters and capacity parameters The setting also includes the discharge current parameters. , Voltage parameters , Temperature parameters and capacity parameters Make settings.

[0012] Optionally, the communication unit adopts a Bluetooth communication module or an NFC module, and the communication unit is used to connect a mobile device with the battery management system to view the status of the lithium battery on the mobile device, or to set various data information of the preset unit.

[0013] Optionally, the data unit includes a data information receiving module, a data information conversion module, a data information gain module, a data information filtering module and a data information cleaning module; The calculation formula of the filtering module is as follows:

[0014] in, It's time The weighted moving average of the data in three time periods, yes The weights of the data points in the three time stages, is the sum of weights, The average value of the data in three time periods is used to eliminate the impact of fluctuation peaks on weight allocation.

[0015] Optionally, before processing the data information, the cleaning module first normalizes the data information to map the value of the data information between [0, 1]; The calculation formula for the normalization process is as follows: ,in, is the original data value, and are the minimum and maximum values ​​of the data, respectively. is the normalized data value.

[0016] Optionally, the calculation formula of the cleaning module is as follows: , Among them, F is the outlier factor, D is the data information of the collected lithium battery, is the number of samples in the jth cluster group, is the distance between sample p and the jth cluster center, and is the jth cluster center; For the distance away from the cluster center, it is set to average the distance of the data information from the center position, and the data results processed by the cluster analysis algorithm are calculated: That is ,in, is the data information of the cluster center, If the distance of the data information is greater than 3d, the data signal is determined to be abnormal data information.

[0017] Optionally, the data management unit is used to store data information of the lithium battery, and the data management unit includes a data storage module, a data abnormality module, a charging record module and an intelligent setting module; The data storage module is used to store all data of the lithium battery; The data anomaly module is used to record abnormal data information in the lithium battery and report the abnormal situation; The charging recording module is used to record the charging process of the lithium battery, including the constant current time, the voltage during constant current, the constant voltage time and the current during constant voltage, as well as the temperature change during charging; The intelligent setting module includes the setting of charging parameters and discharging parameters of the lithium battery, and the battery management system performs battery charging and discharging control and optimization management based on the historical data information of the vehicle.

[0018] In a second aspect, a lithium battery intelligent fast charging method is provided, using any lithium battery intelligent fast charging system described in the first aspect, comprising the following steps: S1. Charge the lithium battery through the charger: When the lithium battery is charged, the voltage of the mains is adjusted by the voltage regulating module in the charger to achieve stable power supply; S2. Switching of power supply mode: During the charging process, the battery is first in the constant current stage. The electromagnetic switch in the charger is connected to the constant current circuit to charge with a fixed current until the battery voltage reaches the set charging voltage. At this time, the electromagnetic switch in the charger is connected to the constant voltage circuit and switches to the constant voltage stage, keeping the battery voltage unchanged while gradually reducing the charging current until the current drops to the preset termination value. At this time, the electromagnetic switch in the charger is connected to the circuit breaker to disconnect the charging process of the lithium battery; S3, detection of charging switching: when charging the lithium battery, the charging current, charging voltage, lithium battery capacity and lithium battery temperature of the lithium battery are detected by the detection unit; S4. Processing the data information obtained from the detection: processing the collected data information of the lithium battery, that is, receiving, converting, amplifying, filtering and cleaning the data information through the communication unit to improve the accuracy of the data information; S5, reverse control adjustment: After the collected data information is processed, it is calculated and processed by the PID control unit, and the battery management system sets various charging and discharging parameters through the preset unit, and the charging current parameters , Voltage parameters , Temperature parameters and capacity parameters , discharge current parameters , Voltage parameters , Temperature parameters and capacity parameters ; Then the PID control unit performs calculations based on the set parameters and detected parameters, and adjusts and optimizes the charging method of the charger based on the calculation results, and regulates, controls and optimizes the discharge process of the lithium battery; S6. Safety protection and early warning: The battery management system is connected to the mobile device through the communication unit to facilitate the reporting of data information, so that the mobile device can observe the charging and discharging process of the lithium battery, and monitor the voltage, temperature and current parameters during the charging process. Once an abnormality is found, the electromagnetic switch in the charger is immediately connected to the circuit breaker to stop charging to prevent the battery from overcharging, over-discharging or overheating. When charging is completed, the battery management system sends a prompt signal to the mobile device through the communication unit to inform the user that the lithium battery charging is complete, thereby ensuring the safety of the lithium battery and extending the life of the lithium battery; S7. Data optimization processing: The battery management system stores various data information of the lithium battery through the data management unit, and analyzes and processes the historical data information before charging, so that the battery management system can optimize the charging process and provide optimization suggestions and predictive maintenance.

[0019] Technical effects and advantages of the present invention: The lithium battery intelligent fast charging system of the present invention realizes various parameter detection of the charging and discharging process of the lithium battery through the detection unit, obtains the parameters such as the current, voltage, temperature and capacity of the lithium battery charging, and performs calculation and analysis processing in combination with the parameters such as the current, voltage, temperature and capacity set by the preset unit, and controls and adjusts the charging process of the charger through the PID control unit, so that the charger can adjust the charging mode according to the real-time lithium battery parameters, which is convenient for realizing fast charging of the lithium battery, and in order to eliminate the influence of the voltage or current fluctuation on the control and adjustment process during the charging process of the lithium battery, which affects the fast charging of the lithium battery, the average value of the combined parameters is calculated and analyzed to eliminate the influence of the fluctuation, so as to realize precise control and regulation of the charging process of the lithium battery; In this way, when the lithium battery is charged, the fluctuation of voltage or current can be eliminated, which makes it easier for the PID control unit to switch the charging mode. In the constant current stage, the charger charges with a fixed current until the battery voltage reaches the set charging voltage. The charger switches to the constant voltage stage to keep the battery voltage unchanged, while gradually reducing the charging current until the current drops to the preset termination value. This can ensure the safety of battery charging and extend the service life. In addition, the historical data information of the lithium battery can be stored for analysis and processing when the lithium battery is charged and discharged, so that the battery management system can optimize the charging process and provide optimization suggestions and predictive maintenance.

[0020] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the lithium battery intelligent fast charging system provided by the present invention; Figure 2 is a schematic diagram of a detection unit provided by the present invention; Figure 3 The present invention is a schematic diagram of the process flow of the lithium battery intelligent fast charging method provided by the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] First, as Figure 1 to Figure 2As shown, an embodiment of the present invention provides a lithium battery intelligent fast charging system, including a battery management system, wherein the battery management system includes a charger, a detection unit, a preset unit, a communication unit, a data unit, a PID control unit and a data management unit; The charger is used to power the lithium battery, and the charger includes an electromagnetic switch, a constant current circuit and a constant voltage circuit. The electromagnetic switch is used to control the switching of the constant current circuit and the constant voltage circuit. The constant current circuit and the constant voltage circuit are used to control the constant current or constant voltage mode of the charging process. The charger also includes a voltage regulating module, and the voltage regulating module is used to adjust the voltage of the mains grid; The detection unit is used to detect various parameters of the lithium battery. The detection unit includes a voltage detection circuit for detecting the charging and discharging voltage of the lithium battery, a current detection circuit for detecting the charging and discharging current of the lithium battery, a battery capacity detection circuit for detecting the capacity of the lithium battery, and a temperature sensor for detecting the temperature of the battery; The preset unit is used to set the charging and discharging parameters of the lithium battery, so that the battery management system can adjust and control the charging and discharging process of the lithium battery according to the set parameter information; The data unit is used to analyze and process the data information collected by the detection unit to facilitate the subsequent use of the data information. The data unit includes receiving the data information, converting the data information, amplifying the data information, filtering the data information and cleaning the data information; The PID control unit is used to control the charging and discharging process of the lithium battery according to the collected data information. The PID control unit obtains the data information processed by the data unit and controls the charger to charge the lithium battery by reverse regulation, that is, the PID control unit switches and regulates the constant current circuit and the constant voltage circuit according to the collected voltage information; The calculation formula of the PID control unit is as follows: ,in, is the output of the controller, is the system error, is the proportional gain coefficient, is the integral gain coefficient, is the differential gain coefficient, is the integral part of the error, is the differential part of the error; in, The calculation of is as follows: , seek the middle is the set voltage value, is the actual measured voltage value, where The average value algorithm is used to eliminate the influence of voltage fluctuation peak value, that is, the actual measured voltage acquisition is segmented into time segments, and the time interval is set to 1ms. The calculation of is as follows: ; Where t is the calculation time point, t-1 and t+1 are the two time points before and after the calculation time point respectively; Vt To calculate the actual measured voltage value at time point t, Vt- 1 is the actual measured voltage value at the calculation time point t-1, Vt+ 1 is the actual measured voltage value at the calculation time point t-1; The voltage detection circuit, the current detection circuit, the battery capacity detection circuit and the temperature sensor in the detection unit are all reversely regulated and controlled by the PID control unit.

[0024] Specifically, the voltage regulating module includes a step-down circuit for converting the high voltage of the mains power grid into a low voltage, the voltage regulating module includes a rectifier circuit for converting the AC voltage into a DC voltage, the voltage regulating module includes a voltage stabilizing circuit for stably outputting the power supply voltage, and the voltage regulating module includes a filtering circuit for eliminating the AC voltage in the DC voltage. Through the above scheme, the high voltage of the mains power grid can stably charge the lithium battery and maintain the voltage stability, thereby improving the safety of the lithium battery charging process.

[0025] Furthermore, the electromagnetic switch is a three-way output switch, the input end of the electromagnetic switch is electrically connected to the output end of the voltage regulating module, the two outputs of the electromagnetic switch are electrically connected to the constant current circuit and the constant voltage circuit respectively, and the middle output path of the electromagnetic switch is a circuit breaker, which is used to open the circuit after the charging reaches a predetermined voltage. Through the setting of the three-way output, the constant current, constant voltage and cut-off control of the charging process of the lithium battery are realized, thereby improving the safety of the charging process and increasing the service life of the lithium battery.

[0026] Specifically, the preset unit includes the current parameter for charging , Voltage parameters , Temperature parameters and capacity parameters The setting also includes the discharge current parameters. , Voltage parameters , Temperature parameters and capacity parameters By setting various parameters of the lithium battery, it is convenient to calculate and analyze the charging and discharging process of the lithium battery, to achieve stable charging and discharging, and to increase the service life of the lithium battery.

[0027] Specifically, the communication unit adopts a Bluetooth communication module and an NFC module. The communication unit is used to connect the mobile device with the battery management system to realize viewing the status of the lithium battery on the mobile device, or setting various data information of the preset unit. Through the design of the communication unit, it is convenient for the battery management system to connect with the mobile device, so that the user can observe various parameter information of the lithium battery and manage or set and adjust the lithium battery.

[0028] Furthermore, the data unit includes a data information receiving module, a data information conversion module, a data information gain module, a data information filtering module and a data information cleaning module; The calculation formula of the filtering module is as follows: ,in, It's time The weighted moving average of the data in three time periods, yes The weights of the data points in the three time stages, is the sum of weights, The average value of the data in the three time stages is used to eliminate the impact of the fluctuation peak on the weight distribution. By processing the data information, the accuracy of the data information is improved, which is convenient for subsequent analysis and calculation of the data information. By combining the data in the three time stages and calculating and analyzing the average value, the fluctuation of voltage or current is eliminated, thereby improving the precise control of the charging process.

[0029] Furthermore, before processing the data information, the cleaning module first normalizes the data information to map the value of the data information between [0, 1]; The calculation formula for the normalization process is as follows: ,in, is the original data value, and are the minimum and maximum values ​​of the data, respectively. It is the normalized data value. By normalizing the data information, the dimension of the data information can be reduced, so that the data information can be quickly analyzed and calculated, reducing the pressure and difficulty of the calculation process.

[0030] Furthermore, the calculation formula of the cleaning module is as follows: , Among them, F is the outlier factor, D is the data information of the collected lithium battery, is the number of samples in the jth cluster group, is the distance between sample p and the jth cluster center, and is the jth cluster center; For the distance away from the cluster center, it is set to average the distance of the data information from the center position, and the data results processed by the cluster analysis algorithm are calculated: That is ,in, is the data information of the cluster center, If the distance of the data information is greater than 3d, the data signal is determined to be abnormal data information. By clustering the data information and analyzing and calculating the abnormal data based on the distance between the cluster center data and each data, it is convenient to remove the abnormal data, improve the accuracy of the data information, and prevent the abnormal data from interfering with the calculation and analysis process.

[0031] Specifically, the data management unit is used to store data information of the lithium battery, and the data management unit includes a data storage module, a data abnormality module, a charging record module and an intelligent setting module; The data storage module is used to store all data of the lithium battery; The data anomaly module is used to record abnormal data information in the lithium battery and report the abnormal situation; The charging recording module is used to record the charging process of the lithium battery, including the constant current time, the voltage during constant current, the constant voltage time and the current during constant voltage, as well as the temperature change during charging; The intelligent setting module includes the setting of charging parameters and discharging parameters of the lithium battery, and the battery management system controls and optimizes the charging and discharging of the battery according to the historical data information of the vehicle. By managing the data information of the lithium battery, the historical data can be stored, so that the battery management system can be optimized and adjusted according to the historical data, and controls and optimizes the charging and discharging of the battery.

[0032] Second, see Figure 3 A lithium battery intelligent fast charging method, using any lithium battery intelligent fast charging system described in the first aspect, comprises the following steps: Step 1: Charge the lithium battery through the charger: When the lithium battery is charged, the voltage regulator module in the charger adjusts the mains voltage to achieve stable power supply; Step 2: Switching the power supply mode: During the charging process, the battery is first in the constant current stage. The electromagnetic switch in the charger is connected to the constant current circuit to charge with a fixed current until the battery voltage reaches the set charging voltage. At this time, the electromagnetic switch in the charger is connected to the constant voltage circuit and switches to the constant voltage stage, keeping the battery voltage unchanged while gradually reducing the charging current until the current drops to the preset termination value. At this time, the electromagnetic switch in the charger is connected to the circuit breaker to disconnect the charging process of the lithium battery; Step 3: Detection of charging switching: When charging the lithium battery, the charging current, charging voltage, lithium battery capacity and lithium battery temperature of the lithium battery are detected by the detection unit; Step 4: Process the data information obtained from the detection: process the collected data information of the lithium battery, that is, receive, convert, amplify, filter and clean the data information through the communication unit to improve the accuracy of the data information; Step 5: Reverse control adjustment: After processing the collected data information, it is calculated and processed by the PID control unit, and the battery management system sets various charging and discharging parameters through the preset unit, and the charging current parameters , Voltage parameters , Temperature parameters and capacity parameters , discharge current parameters , Voltage parameters , Temperature parameters and capacity parameters ; Then the PID control unit performs calculations based on the set parameters and detected parameters, and adjusts and optimizes the charging method of the charger based on the calculation results, and regulates, controls and optimizes the discharge process of the lithium battery; Step 6: Safety protection and early warning: The battery management system is connected to the mobile device through the communication unit to facilitate reporting of data information, so that the mobile device can observe the charging and discharging process of the lithium battery, and monitor the voltage, temperature and current parameters during the charging process. Once an abnormality is found, the electromagnetic switch in the charger is immediately connected to the circuit breaker to stop charging to prevent the battery from overcharging, over-discharging or overheating. When charging is completed, the battery management system sends a prompt signal to the mobile device through the communication unit to inform the user that the lithium battery charging is complete, thereby ensuring the safety of the lithium battery and extending the life of the lithium battery. Step 7. Data optimization: The battery management system stores various data information of the lithium battery through the data management unit, and analyzes and processes the historical data information before charging, so that the battery management system can optimize the charging process, provide optimization suggestions and predictive maintenance.

[0033] When the lithium battery intelligent fast charging system is in use, at the initial stage of charging, a constant current circuit is used for stable power supply. For example, if the battery capacity is 2000mAh (2Ah), the constant current charging current is usually between 1A and 2A. When the lithium battery is charged for the first time, the constant current charging current is set to 2A. At this time, the electromagnetic switch connects the constant current circuit for constant current charging, and sets 4.2V for each single cell. For multiple battery packs in series, the charging voltage will increase accordingly; for example, for a 3S (3-cell series) battery pack, the charging voltage is 4.2V×3=12.6V, that is, When the charging voltage of the lithium battery reaches 12.6V, the electromagnetic switch is connected to the constant voltage circuit for constant voltage charging. In the constant voltage stage, the charger maintains the set charging voltage, and the current gradually decreases until it drops to a preset termination current value. This termination current is generally 0.05C to 0.1C of the rated capacity of the battery. For example, for a 2Ah battery, the termination current is 0.1A to 0.2A. The lithium battery used for the first time is set to a cut-off current of 0.2A. At the time of cut-off, the electromagnetic switch is connected to the circuit breaker to cut off the power to the lithium battery and reduce the continuous charging of the lithium battery by trickle charging. The battery management system controls charging through the PID control unit. During multiple tests, it was found that when the lithium battery is charging, the voltage or current is in a fluctuating state. During the fluctuation, if the current or voltage exceeds the set 2A or 12.6V, the charging mode will switch. This probability is found in the test calculation, accounting for 20%. It is particularly obvious when the power grid is unstable. When the capacity of the lithium battery does not reach the set value, switching the charging mode can easily cause damage to the lithium battery. In order to eliminate the impact of fluctuations, by setting the collection of three sets of data information for average processing, the impact of fluctuations can be effectively eliminated. The accuracy of charging mode switching for lithium batteries reaches 99.1%, which effectively maintains the switching of lithium battery charging modes and improves the service life and safety of lithium batteries. And during the test, the temperature of the lithium battery is set, and the charging temperature range of the lithium battery is 0°C to 45°C; within this range, the battery charging can usually maintain good safety and performance; when it is below 0°C, the charging process may cause the precipitation of lithium metal inside the battery, damaging the battery performance; when it is above 45°C, it may cause battery overheating and safety hazards, so when the lithium battery is charged, the temperature control parameters are set, and the temperature sensor in the detection unit detects the temperature in real time. When the temperature is outside the range of 0°C to 45°C, the PID control unit controls the electromagnetic switch to connect the circuit breaker to protect the lithium battery; The discharge temperature range of lithium batteries is usually -20°C to 60°C; within this range, the battery's discharge performance is relatively stable; below -20°C, the battery's internal impedance increases and the discharge capacity decreases; above 60°C, the battery's life and performance may be seriously affected.

[0034] To summarize, this application can effectively eliminate fluctuations in the charging process by performing a combined average analysis of the parameters of the lithium battery, so that the charging mode switching accuracy of the lithium battery reaches 99.1%, thereby improving the charging safety of the lithium battery. It adopts advanced charging algorithms and intelligent management technologies to achieve fast and efficient charging, shorten the charging time, and integrate multiple protection mechanisms such as voltage, temperature control and current limitation to ensure battery safety and long life. The system can monitor the battery status in real time, automatically adjust the charging parameters, and optimize the charging process; it provides an intuitive interface and operation method, allowing users to easily set and monitor the charging process.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery intelligent fast charging system, characterized in that: It includes a battery management system, which includes a charger, a detection unit, a preset unit, a communication unit, a data unit, a PID control unit and a data management unit; The charger is used to power the lithium battery, and the charger includes an electromagnetic switch, a constant current circuit and a constant voltage circuit. The electromagnetic switch is used to control the switching of the constant current circuit and the constant voltage circuit. The constant current circuit and the constant voltage circuit are used to control the constant current or constant voltage mode of the charging process. The charger also includes a voltage regulating module, and the voltage regulating module is used to adjust the voltage of the mains grid; The detection unit is used to detect various parameters of the lithium battery. The detection unit includes a voltage detection circuit for detecting the charging and discharging voltage of the lithium battery, a current detection circuit for detecting the charging and discharging current of the lithium battery, a battery capacity detection circuit for detecting the capacity of the lithium battery, and a temperature sensor for detecting the temperature of the battery; The preset unit is used to set the charging and discharging parameters of the lithium battery, so that the battery management system can adjust and control the charging and discharging process of the lithium battery according to the set parameter information; The data unit is used to analyze and process the data information collected by the detection unit to facilitate the subsequent use of the data information. The data unit includes receiving the data information, converting the data information, amplifying the data information, filtering the data information and cleaning the data information; The PID control unit is used to control the charging and discharging process of the lithium battery according to the collected data information. The PID control unit obtains the data information processed by the data unit and controls the charger to charge the lithium battery by reverse regulation, that is, the PID control unit switches and regulates the constant current circuit and the constant voltage circuit according to the collected voltage information; The calculation formula of the PID control unit is as follows: ,in, is the output of the controller, is the system error, is the proportional gain coefficient, is the integral gain coefficient, is the differential gain coefficient, is the integral part of the error, is the differential part of the error; in, The calculation of is as follows: , seek the middle is the set voltage value, is the actual measured voltage value, where The average value algorithm is used to eliminate the influence of voltage fluctuation peak value, that is, the actual measured voltage acquisition is segmented into time segments, and the time interval is set to 1ms. The calculation of is as follows: ； Where t is the calculation time point, t-1 and t+1 are the two time points before and after the calculation time point respectively; The voltage detection circuit, the current detection circuit, the battery capacity detection circuit and the temperature sensor in the detection unit are all reversely regulated and controlled by the PID control unit.

2. A lithium battery intelligent fast charging system according to claim 1, characterized in that: The voltage regulating module includes a step-down circuit for converting the high voltage of the municipal power grid into a low voltage, the voltage regulating module includes a rectifier circuit for converting the AC voltage into a DC voltage, the voltage regulating module includes a voltage stabilizing circuit for outputting a stable power supply voltage, and the voltage regulating module includes a filtering circuit for eliminating the AC voltage in the DC voltage.

3. A lithium battery intelligent fast charging system according to claim 1, characterized in that: The electromagnetic switch is a three-way output switch, the input end of the electromagnetic switch is electrically connected to the output end of the voltage regulating module, the two outputs of the electromagnetic switch are electrically connected to the constant current circuit and the constant voltage circuit respectively, and the middle output path of the electromagnetic switch is a circuit breaker, which is used to open the circuit after the charging reaches a predetermined voltage.

4. The lithium battery intelligent fast charging system according to claim 1, characterized in that: The preset unit includes the current parameters for charging , Voltage parameters , Temperature parameters and capacity parameters The setting also includes the discharge current parameters. , Voltage parameters , Temperature parameters and capacity parameters Make settings.

5. The lithium battery intelligent fast charging system according to claim 1, characterized in that: The communication unit adopts a Bluetooth communication module and an NFC module. The communication unit is used to connect the mobile device with the battery management system to realize viewing the status of the lithium battery on the mobile device, or to set various data information of the preset unit.

6. The lithium battery intelligent fast charging system according to claim 1, characterized in that: The data unit includes a data information receiving module, a data information conversion module, a data information gain module, a data information filtering module and a data information cleaning module; The calculation formula of the filtering module is as follows: ； in, It's time The weighted moving average of the data in three time periods, yes The weights of the data points in the three time stages, is the sum of weights, The average value of the data in three time periods is used to eliminate the impact of fluctuation peaks on weight allocation.

7. A lithium battery intelligent fast charging system according to claim 6, characterized in that: Before processing the data information, the cleaning module first normalizes the data information and maps the value of the data information between [0, 1]; The calculation formula for the normalization process is as follows: ,in, is the original data value, and are the minimum and maximum values ​​of the data, respectively. is the normalized data value.

8. A lithium battery intelligent fast charging system according to claim 7, characterized in that: The calculation formula of the cleaning module is as follows: ， Among them, F is the outlier factor, D is the data information of the collected lithium battery, is the number of samples in the jth cluster group, is the distance between sample p and the jth cluster center, and is the jth cluster center; For the distance away from the cluster center, it is set to average the distance of the data information from the center position, and the data results processed by the cluster analysis algorithm are calculated: That is ,in, is the data information of the cluster center, If the distance of the data information is greater than 3d, the data signal is determined to be abnormal data information.

9. The lithium battery intelligent fast charging system according to claim 1, characterized in that: The data management unit is used to store data information of the lithium battery, and the data management unit includes a data storage module, a data abnormality module, a charging record module and an intelligent setting module; The data storage module is used to store all data of the lithium battery; The data anomaly module is used to record abnormal data information in the lithium battery and report the abnormal situation; The charging recording module is used to record the charging process of the lithium battery, including the constant current time, the voltage during constant current, the constant voltage time and the current during constant voltage, and the temperature change during charging; The intelligent setting module includes the setting of charging parameters and discharging parameters of the lithium battery, and the battery management system performs battery charging and discharging control and optimization management based on the historical data information of the vehicle.

10. A lithium battery intelligent fast charging method, using the lithium battery intelligent fast charging system according to any one of claims 1 to 9, characterized in that: The following steps are included: S1. Charge the lithium battery through the charger: When the lithium battery is charged, the voltage of the mains is adjusted by the voltage regulating module in the charger to achieve stable power supply; S2. Switching of power supply mode: During the charging process, the battery is first in the constant current stage. The electromagnetic switch in the charger is connected to the constant current circuit to charge with a fixed current until the battery voltage reaches the set charging voltage. At this time, the electromagnetic switch in the charger is connected to the constant voltage circuit and switches to the constant voltage stage, keeping the battery voltage unchanged while gradually reducing the charging current until the current drops to the preset termination value. At this time, the electromagnetic switch in the charger is connected to the circuit breaker to disconnect the charging process of the lithium battery; S3, detection of charging switching: when charging the lithium battery, the charging current, charging voltage, lithium battery capacity and lithium battery temperature of the lithium battery are detected by the detection unit; S4. Processing the data information obtained from the detection: processing the collected data information of the lithium battery, that is, receiving, converting, amplifying, filtering and cleaning the data information through the communication unit to improve the accuracy of the data information; S5, reverse control adjustment: After the collected data information is processed, it is calculated and processed by the PID control unit, and the battery management system sets various charging and discharging parameters through the preset unit, and the charging current parameters , Voltage parameters , Temperature parameters and capacity parameters , discharge current parameters , Voltage parameters , Temperature parameters and capacity parameters ; Then the PID control unit performs calculations based on the set parameters and detected parameters, and adjusts and optimizes the charging mode of the charger based on the calculation results, and regulates, controls and optimizes the discharge process of the lithium battery; S6. Safety protection and early warning: The battery management system is connected to the mobile device through the communication unit to facilitate the reporting of data information, so that the mobile device can observe the charging and discharging process of the lithium battery, and monitor the voltage, temperature and current parameters during the charging process. Once an abnormality is found, the electromagnetic switch in the charger is immediately connected to the circuit breaker to stop charging to prevent the battery from overcharging, over-discharging or overheating. When charging is completed, the battery management system sends a prompt signal to the mobile device through the communication unit to inform the user that the lithium battery charging is complete, thereby ensuring the safety of the lithium battery and extending the life of the lithium battery; S7. Data optimization processing: The battery management system stores various data information of the lithium battery through the data management unit, and analyzes and processes the historical data information before charging, so that the battery management system can optimize the charging process and provide optimization suggestions and predictive maintenance.

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