A charging control method and device for a lithium-ion battery

Abstract

The present invention discloses a charging control method and device for a lithium-ion battery, belonging to the technical field of lithium-ion battery charging. The method includes the following steps: obtaining performance characterization parameters of the lithium-ion battery, analyzing to obtain pre-charging execution condition information of the lithium-ion battery, and pre-charging the lithium-ion battery; monitoring pre-charging performance data of the lithium-ion battery, determining initial-stage grading capacitance continuous charging parameters of the lithium-ion battery based on the pre-charging performance data, performing grading capacitance continuous charging control on the lithium-ion battery with the initial-stage grading capacitance continuous charging parameters, and monitoring the process of the grading capacitance continuous charging control in real time to obtain a real-time monitoring result for adjustment control management. The present invention pre-charges the lithium-ion battery through the pre-charging execution condition information and performs grading capacitance continuous charging control on the lithium-ion battery with the initial-stage grading capacitance continuous charging parameters, achieving accurate and effective charging control of the lithium-ion battery and solving the problem that the prior art cannot accurately and effectively perform charging control on the lithium-ion battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion battery charging, and particularly to a charging control method and device for lithium-ion batteries. Background Art

[0002] With the popularization of lithium-ion batteries in various applications, the requirements for charging control technology are getting higher and higher. How to improve charging efficiency, extend battery life and ensure battery safety has become the key research and development direction. By continuously optimizing the charging control method, the performance of lithium-ion batteries can be effectively improved while ensuring the user's safety in use. Therefore, the charging control technology has important theoretical significance and practical value in the application of lithium-ion batteries.

[0003] For example, a lithium-ion battery non-lithium precipitation fast charging digital optimization method disclosed in a patent application with the publication number: CN117175040A includes: building a high-precision simulation model of a lithium-ion battery based on an electrode equivalent circuit model through a high-precision simulation module of the lithium-ion battery, an internal state estimation module for online estimation of internal states such as the anode potential of the lithium-ion battery, and using a safe charging area setting module to set the safe fast charging area of the lithium-ion battery. And an optimal charging current calculation module for setting a current control scheme and calculating the optimal charging current at the next moment.

[0004] For example, a long-life fast charging method for lithium-ion batteries disclosed in an invention patent announcement with the announcement number: CN105932349B includes: establishing an improved single-particle model for the lithium-ion battery; obtaining the mechanism parameters of the battery in the improved single-particle model by using the method of excitation response analysis; obtaining the lithium intercalation rate on the surface of the negative electrode active material of the battery according to the mechanism parameters of the battery; comparing the size relationship between the lithium intercalation rate on the surface of the negative electrode active material and a set threshold, and controlling the charging current size and charging time of the battery according to the size relationship to achieve fast charging of the lithium-ion battery.

[0005] However, in the process of implementing the technical solution of the present invention in the embodiments of the present application, it is found that the above technologies have at least the following technical problems:

[0006] In the prior art, the internal state of the lithium-ion battery is estimated through a high-precision simulation module, the safe fast charging area of the lithium-ion battery is set, and the optimal charging current is calculated. However, due to the influence of aging and various external factors during the actual use of the lithium-ion battery, the actual battery performance often cannot be well adapted and managed during the actual charging process. Therefore, the prior art has the problem of being unable to accurately and effectively control the charging of lithium-ion batteries. Summary of the Invention

[0007] The embodiments of the present application provide a charging control method and device for a lithium-ion battery, which solve the problem in the prior art that the charging control of the lithium-ion battery cannot be accurately and effectively performed, and realize the accurate and effective charging control of the lithium-ion battery.

[0008] The embodiments of the present application provide a charging control method for a lithium-ion battery, including the following steps: The pre-charge controller senses the charging trigger signal of the lithium-ion battery, and starts the battery performance sensor to retrieve and process the performance characterization parameters of the lithium-ion battery to obtain the performance characterization coefficient of the lithium-ion battery; Based on the performance characterization coefficient of the lithium-ion battery, analyze and obtain the pre-charge execution condition information of the lithium-ion battery, and activate the power storage controller to perform pre-charge processing on the lithium-ion battery according to the pre-charge execution condition information, and simultaneously monitor the pre-charge performance data of the lithium-ion battery; Process the pre-charge performance data of the lithium-ion battery to determine the initial stage grading and continuous charging parameters of the lithium-ion battery, and use the power storage controller to perform grading and continuous charging control on the lithium-ion battery according to the initial stage grading and continuous charging parameters; Real-time monitor the process of grading and continuous charging control of the lithium-ion battery, and obtain the real-time monitoring result for corresponding adjustment control management.

[0009] Further, the specific process of starting the battery performance sensor to retrieve and process the performance characterization parameters of the lithium-ion battery is as follows: Start the battery performance sensor to obtain the performance characterization parameters of the lithium-ion battery, and process them in combination with the preset performance characterization parameter comparison set of the lithium-ion battery to obtain the performance characterization coefficient of the lithium-ion battery; The performance characterization parameters of the lithium-ion battery include: battery open-circuit voltage, battery initial internal resistance, battery current full-load capacity, battery rated capacity, and battery historical average operating temperature; The performance characterization coefficient of the lithium-ion battery is used to characterize the current basic performance of the lithium-ion battery.

[0010] Further, the specific method for obtaining the performance characterization coefficient of the lithium-ion battery is:

[0011]

[0012] In the formula, α represents the performance characterization coefficient of the lithium-ion battery, U represents the battery open-circuit voltage, U′ represents the preset battery open-circuit voltage reference value, R represents the battery initial internal resistance, R′ represents the preset battery initial internal resistance reference value, Q represents the battery current full-load capacity, Q′ represents the battery rated capacity, T represents the battery historical average operating temperature, T′ represents the preset battery historical average operating temperature reference value, and e is the natural constant.

[0013] Further, the process of analyzing and obtaining the pre-charging execution condition information of the lithium-ion battery is as follows: Obtain the performance characterization coefficient of the lithium-ion battery, match the performance characterization coefficient of the lithium-ion battery with the pre-charging execution condition information corresponding to each preset performance characterization coefficient interval, and obtain the pre-charging execution condition information corresponding to the interval where the performance characterization coefficient of the lithium-ion battery is located, which is denoted as the pre-charging execution condition information of the lithium-ion battery; The pre-charging execution condition information of the lithium-ion battery specifically includes: pre-charging current and preset charging time.

[0014] Further, the process of processing based on the pre-charging performance data of the lithium-ion battery is as follows: Pre-charge the lithium-ion battery with the pre-charging execution condition information, obtain the pre-charging performance data of the lithium-ion battery, and analyze the pre-charging performance data of the lithium-ion battery to obtain the pre-charging performance value of the lithium-ion battery; The pre-charging performance value of the lithium-ion battery is used to characterize the pre-charging health state of the lithium-ion battery; The pre-charging performance data of the lithium-ion battery includes: pre-charging execution time, battery voltage rise rate, battery current rise rate, and battery temperature rise rate.

[0015] Further, the process of determining the initial-stage formation and continuous charging parameters of the lithium-ion battery is as follows: Obtain the pre-charging performance value of the lithium-ion battery, obtain the preset pre-charging performance threshold, compare the pre-charging performance value of the lithium-ion battery with the pre-charging performance threshold. When the pre-charging performance value of the lithium-ion battery is greater than or equal to the pre-charging performance threshold, perform formation and continuous charging on the lithium-ion battery with the default initial-stage formation and continuous charging parameters; When the pre-charging performance value of the lithium-ion battery is less than the pre-charging performance threshold, extract the difference between the pre-charging performance value of the lithium-ion battery and the pre-charging performance threshold, which is denoted as the formation and continuous charging adjustment value, and match the formation and continuous charging adjustment value of the lithium-ion battery with the initial-stage formation and continuous charging parameter adjustment values corresponding to each preset formation and continuous charging adjustment value interval in the database to obtain the initial-stage formation and continuous charging parameter adjustment value corresponding to the interval where the formation and continuous charging adjustment value of the lithium-ion battery is located, which is denoted as the initial-stage formation and continuous charging parameter adjustment value of the lithium-ion battery; Add the default initial-stage formation and continuous charging parameters to the initial-stage formation and continuous charging parameter adjustment value of the lithium-ion battery to obtain the initial-stage formation and continuous charging parameters of the lithium-ion battery. The default initial-stage formation and continuous charging parameters are the default fast charging cut-off capacity value and the default constant voltage charging cut-off capacity value, and the initial-stage formation and continuous charging parameter adjustment values include the fast charging cut-off capacity adjustment value and the constant voltage charging cut-off capacity adjustment value.

[0016] Further, the process of obtaining the real-time monitoring result for corresponding adjustment control management is as follows: Obtain the environmental impact parameters during the formation and continuous charging process of the lithium-ion battery and the continuous charging characteristic data of the lithium-ion battery, and determine the real-time formation and continuous charging stage of the lithium-ion battery, and obtain the comparison set for the real-time formation and continuous charging stage of the lithium-ion battery; Process the environmental impact parameters during the formation and continuous charging process of the lithium-ion battery, the continuous charging characteristic data of the lithium-ion battery, and the comparison set for the real-time formation and continuous charging stage of the lithium-ion battery to obtain the continuous charging characteristic value of the lithium-ion battery; The environmental impact parameters include: environmental temperature, environmental humidity, and environmental atmospheric pressure; The continuous charging characteristic data of the lithium-ion battery includes: battery real-time voltage, battery real-time current, battery internal resistance, and battery real-time temperature; Based on the continuous charging characteristic value of the lithium-ion battery, process to obtain the real-time monitoring result and perform corresponding adjustment control management; The real-time monitoring result is real-time monitoring steady state or real-time monitoring anomaly.

[0017] Further, the process of obtaining the real-time monitoring result is as follows: Obtain the continuous charging characteristic value of the lithium-ion battery, obtain the preset continuous charging characteristic threshold, compare the continuous charging characteristic value of the lithium-ion battery with the continuous charging characteristic threshold. When the continuous charging characteristic value of the lithium-ion battery is greater than or equal to the continuous charging characteristic threshold, the real-time monitoring result of the real-time formation and continuous charging stage of the lithium-ion battery is real-time monitoring steady state. When the continuous charging characteristic value of the lithium-ion battery is less than the continuous charging characteristic threshold, the real-time monitoring result of the real-time formation and continuous charging stage of the lithium-ion battery is real-time monitoring anomaly.

[0018] Further, the process of performing corresponding adjustment control management is as follows: When the real-time monitoring result of the real-time formation and continuous charging stage of the lithium-ion battery is real-time monitoring steady state, no adjustment operation is performed, and the lithium-ion battery continues to be charged with the current continuous charging current. When the real-time monitoring result of the real-time formation and continuous charging stage of the lithium-ion battery is real-time monitoring anomaly, extract the difference between the continuous charging characteristic value of the lithium-ion battery and the continuous charging characteristic threshold, denoted as the continuous charging current adjustment value, and match the continuous charging current adjustment value with the continuous charging current reduction value corresponding to each preset continuous charging current adjustment value interval in the database to obtain the continuous charging current reduction value corresponding to the interval where the continuous charging current adjustment value is located, denoted as the continuous charging current reduction value of the lithium-ion battery; Subtract the continuous charging current reduction value of the lithium-ion battery from the real-time continuous charging current to obtain the continuous charging current of the lithium-ion battery and perform adjustment control.

[0019] An embodiment of the present application provides a charging control device for a lithium-ion battery, including a battery performance acquisition module, a pre-charging module, a grading and continuous charging module, and an adjustment module: Battery performance analysis module: used for the pre-charging controller to sense the charging trigger signal of the lithium-ion battery, and start the battery performance sensor to retrieve and process the performance characterization parameters of the lithium-ion battery to obtain the performance characterization coefficient of the lithium-ion battery; Pre-charging module: used for analyzing to obtain the pre-charging execution condition information of the lithium-ion battery based on the performance characterization coefficient of the lithium-ion battery, and activating the power storage controller to perform pre-charging processing on the lithium-ion battery with the pre-charging execution condition information, and simultaneously monitoring the pre-charging performance data of the lithium-ion battery; Grading and continuous charging module: used for processing based on the pre-charging performance data of the lithium-ion battery to determine the initial-stage grading and continuous charging parameters of the lithium-ion battery, and using the power storage controller to perform grading and continuous charging control on the lithium-ion battery with the initial-stage grading and continuous charging parameters; Adjustment module: used for monitoring the process of grading and continuous charging control of the lithium-ion battery in real time, and obtaining the real-time monitoring result for corresponding adjustment control management.

[0020] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0021] 1. In this embodiment, by obtaining and analyzing the performance characterization coefficient of the lithium-ion battery to obtain the pre-charging execution condition information of the lithium-ion battery, and performing pre-charging with the pre-charging execution condition information, it effectively guarantees the rationality of the pre-charging execution condition of the lithium-ion battery, reduces the damage to the lithium-ion battery caused by improper pre-charging execution, monitors the pre-charging performance data for analysis to determine the initial-stage grading and continuous charging parameters, and can accurately and effectively adjust the initial-stage grading and continuous charging parameters of the lithium-ion battery in a timely manner according to the pre-charging situation of the lithium-ion battery, improving the charging efficiency of the lithium-ion battery. Then, by monitoring the process of grading and continuous charging control in real time and performing corresponding adjustment control management, it can adjust the charging situation of the lithium-ion battery in a timely and accurate manner, reduce the damage to the lithium-ion battery, and improve the service life of the lithium-ion battery.

[0022] 2. By obtaining the pre-charging performance data of the lithium-ion battery to obtain the pre-charging performance value, determining and adjusting the initial-stage grading and continuous charging parameters of the lithium-ion battery according to the pre-charging performance value of the lithium-ion battery, it effectively adjusts the initial-stage grading and continuous charging parameters according to the situation of the lithium-ion battery, adapts to the grading and continuous charging requirements of the lithium-ion battery in different situations, reduces the performance decline or safety problems caused by improper charging strategies, and improves the stability and safety of lithium-ion battery charging.

[0023] 3. By obtaining the environmental impact parameters and the continuous charging characteristic data of the lithium-ion battery during the grading and continuous charging process, and analyzing and performing corresponding adjustment management in combination with the control set at the stage where the lithium-ion battery is graded and continuously charged, refined analysis according to different continuous charging stages of the lithium-ion battery is achieved, the stability and safety during the continuous charging process of the lithium-ion battery are improved, the battery state is accurately monitored, and the continuous charging current is adjusted according to the continuous charging characteristic value, avoiding overcharging or overheating phenomena, reducing battery aging, and increasing the service life of the battery. Brief Description of the Drawings

[0024] Figure 1 It is a flowchart of a charging control method for a lithium-ion battery provided by an embodiment of the present application;

[0025] Figure 2 It is a structural diagram of a charging control device for a lithium-ion battery provided by an embodiment of the present application. Detailed Embodiment

[0026] By providing a charging control method and device for a lithium-ion battery, the embodiment of the present application solves the problem in the prior art that the charging control of the lithium-ion battery cannot be accurately and effectively performed. By obtaining and analyzing the performance characterization coefficient of the lithium-ion battery, the pre-charging execution condition information of the lithium-ion battery is obtained, and pre-charging is performed based on the pre-charging execution condition information, effectively ensuring the rationality of the pre-charging execution condition of the lithium-ion battery, reducing the damage of the lithium-ion battery caused by unreasonable pre-charging execution, and monitoring the pre-charging performance data for analysis to determine the initial grading and continuous charging parameters, so that the initial grading and continuous charging parameters of the lithium-ion battery can be accurately and effectively adjusted in a timely manner according to the pre-charging situation of the lithium-ion battery, improving the charging efficiency of the lithium-ion battery. Then, the process of grading and continuous charging control is monitored in real time and corresponding adjustment control management is performed, so that the charging situation of the lithium-ion battery can be adjusted in a timely and accurate manner, reducing the damage of the lithium-ion battery and increasing the service life of the lithium-ion battery.

[0027] The technical solution in the embodiment of the present application is to solve the above problem that the charging control of the lithium-ion battery cannot be accurately and effectively performed. The general idea is as follows:

[0028] By sensing the charging trigger signal of the lithium-ion battery, retrieving the performance characterization parameters of the lithium-ion battery for processing, and obtaining the performance characterization coefficient of the lithium-ion battery; based on the performance characterization coefficient of the lithium-ion battery, analyzing to obtain the pre-charging execution condition information of the lithium-ion battery, and performing pre-charging processing on the lithium-ion battery with the pre-charging execution condition information, while synchronously monitoring the pre-charging performance data of the lithium-ion battery; processing based on the pre-charging performance data of the lithium-ion battery to determine the initial-stage grading and continuous charging parameters of the lithium-ion battery, and controlling the grading and continuous charging of the lithium-ion battery with the initial-stage grading and continuous charging parameters through the power storage controller; monitoring the process of the grading and continuous charging control of the lithium-ion battery in real time, obtaining the real-time monitoring result for corresponding adjustment and control management, achieving accurate and timely charging control of the lithium-ion battery.

[0029] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0030] As Figure 1 shown, it is a flowchart of a charging control method for a lithium-ion battery provided by an embodiment of the present application. This method is applied to a charging control device for a lithium-ion battery. The method includes the following steps: The pre-charging controller senses the charging trigger signal of the lithium-ion battery and starts the battery performance sensor to retrieve the performance characterization parameters of the lithium-ion battery for processing, obtaining the performance characterization coefficient of the lithium-ion battery; based on the performance characterization coefficient of the lithium-ion battery, analyzing to obtain the pre-charging execution condition information of the lithium-ion battery, and activating the power storage controller to perform pre-charging processing on the lithium-ion battery with the pre-charging execution condition information, while synchronously monitoring the pre-charging performance data of the lithium-ion battery; processing based on the pre-charging performance data of the lithium-ion battery to determine the initial-stage grading and continuous charging parameters of the lithium-ion battery, and controlling the grading and continuous charging of the lithium-ion battery with the initial-stage grading and continuous charging parameters through the power storage controller; monitoring the process of the grading and continuous charging control of the lithium-ion battery in real time, obtaining the real-time monitoring result for corresponding adjustment and control management.

[0031] In this embodiment, the pre-charging controller is used to sense the charging trigger signal of the lithium-ion battery and perform pre-charging on the lithium-ion battery. When the lithium-ion battery reaches the preset remaining capacity value for power storage trigger, the charging signal is automatically triggered. The battery performance sensor is used to obtain the performance characterization parameters of the lithium-ion battery. The power storage controller is a device for charging the lithium-ion battery. When the lithium-ion battery is at a low voltage, a low-current and low-voltage charging process is first performed to restore the normal working state of the battery, that is, pre-charging the lithium-ion battery. The grading and continuous charging of lithium ions are controlled to ensure reasonable power distribution and continuous charging control of the battery at different charging stages, thereby extending the service life of the battery and improving the charging efficiency.

[0032] Further, start the battery performance sensor to retrieve and process the performance characterization parameters of the lithium-ion battery. The specific process is as follows: Start the battery performance sensor to obtain the performance characterization parameters of the lithium-ion battery, and process them in combination with a preset reference set of the performance characterization parameters of the lithium-ion battery to obtain the performance characterization coefficient of the lithium-ion battery. The performance characterization parameters of the lithium-ion battery include: the open-circuit voltage of the battery, the initial internal resistance of the battery, the current full-load capacity of the battery, the rated capacity of the battery, and the historical average operating temperature of the battery. The performance characterization coefficient of the lithium-ion battery is used to characterize the current basic performance of the lithium-ion battery.

[0033] The open-circuit voltage of the battery is the voltage across the battery terminals when the battery is not connected to any load (i.e., no current is flowing). The initial internal resistance of the battery is the resistance inside the battery to the flow of current. The current full-load capacity of the battery is the maximum electrical energy that the battery can store in its current state. The historical average operating temperature of the battery is the average temperature of the battery during its historical operation (i.e., the charging and discharging processes). The open-circuit voltage of the battery is obtained using a multimeter. The initial internal resistance of the battery is obtained through an alternating current impedance spectroscopy test. The current full-load capacity of the battery is obtained through the existing battery management system. The battery management system is a system used to monitor and manage rechargeable batteries. The battery management system mentioned below refers to this battery management system. The historical average operating temperature of the battery is obtained by a temperature sensor, and the historical operating temperature of the lithium-ion battery is statistically analyzed and then averaged. The reference value of the open-circuit voltage of the battery, the reference value of the initial internal resistance of the battery, the reference value of the rated capacity of the battery, and the reference value of the historical average operating temperature of the battery are obtained from the database.

[0034] Further, the specific method for obtaining the performance characterization coefficient of the lithium-ion battery is as follows:

[0035]

[0036] In the formula, α represents the performance characterization coefficient of the lithium-ion battery, U represents the open-circuit voltage of the battery, U′ represents the preset reference value of the open-circuit voltage of the battery, R represents the initial internal resistance of the battery, R′ represents the preset reference value of the initial internal resistance of the battery, Q represents the current full-load capacity of the battery, Q′ represents the rated capacity of the battery, T represents the historical average operating temperature of the battery, T′ represents the preset reference value of the historical average operating temperature of the battery, and e is the natural constant.

[0037] In this embodiment, the open-circuit voltage of the battery reflects the electrochemical state of the battery. The open-circuit voltage is usually closely related to the state of charge of the battery, reflecting the basic condition of the open-circuit voltage of the battery. The initial internal resistance of the battery directly affects the battery performance. The current full-load capacity of the battery directly determines the battery's endurance. The historical average operating temperature of the battery has an important impact on its performance and lifespan. Temperature is a key factor affecting the health and performance of lithium-ion batteries. The open-circuit voltage of the battery, the initial internal resistance of the battery, the current full-load capacity of the battery, and the historical average operating temperature of the battery can characterize the basic performance of lithium-ion batteries to a certain extent. There is also a close relationship among the open-circuit voltage of the battery, the initial internal resistance of the battery, the current full-load capacity of the battery, and the historical average operating temperature of the battery. The open-circuit voltage of the battery reflects the current state of the battery and is associated with the initial internal resistance of the battery, the current full-load capacity of the battery, and the historical average operating temperature of the battery. The open-circuit voltage of a lithium-ion battery changes with its state of charge. The open-circuit voltage of the battery can provide some estimates of the remaining capacity of the battery. A higher open-circuit voltage of the battery means a higher remaining capacity of the battery. The open-circuit voltage of the battery is affected by the internal resistance. A high internal resistance usually means a poorer state of the battery, and the open-circuit voltage of the battery may be affected. The open-circuit voltage of the battery is also affected by the historical average operating temperature. At low temperatures, the chemical reaction rate of the battery slows down, resulting in a decrease in the open-circuit voltage. At high temperatures, the open-circuit voltage may increase slightly, but too high a temperature may also accelerate the aging of the battery. A battery with a lower initial internal resistance usually has a higher maximum capacity. When a lithium-ion battery operates at a high temperature for a long time, the chemical reaction rate of the battery increases, and the electrolyte and other materials in the battery may degenerate, which may lead to a decrease in the maximum capacity of the lithium-ion battery. Too high or too low a temperature will accelerate the aging process of the battery, thus affecting the initial internal resistance of the lithium-ion battery and the current full-load capacity of the battery.

[0038] Furthermore, the pre-charge execution condition information of the lithium-ion battery is obtained through analysis. The specific process is as follows: Obtain the performance characterization coefficient of the lithium-ion battery, and match the performance characterization coefficient of the lithium-ion battery with the pre-charge execution condition information corresponding to each pre-set performance characterization coefficient interval to obtain the pre-charge execution condition information corresponding to the interval in which the performance characterization coefficient of the lithium-ion battery is located, which is denoted as the pre-charge execution condition information of the lithium-ion battery; The pre-charge execution condition information of the lithium-ion battery specifically includes: the pre-charge current and the preset charging time.

[0039] In this embodiment, the pre-charge execution condition information of the lithium-ion battery is obtained based on the performance characterization coefficient of the lithium-ion battery, that is, the pre-charge current and the preset charging time of the lithium-ion battery are obtained. Then, the lithium-ion battery is charged with the obtained pre-charge current, and the preset charging time is used as a standard data for judging the pre-charge performance.

[0040] Furthermore, processing is performed based on the pre-charge performance data of the lithium-ion battery. The specific process is: pre-charging the lithium-ion battery based on the pre-charge execution condition information, obtaining the pre-charge performance data of the lithium-ion battery, and analyzing the pre-charge performance data of the lithium-ion battery to obtain the pre-charge performance value of the lithium-ion battery; the pre-charge performance value of the lithium-ion battery is used to characterize the pre-charge health status of the lithium-ion battery; the pre-charge performance data of the lithium-ion battery includes: pre-charge execution time, battery voltage rise rate, battery current rise rate and battery temperature rise rate.

[0041] In this embodiment, the specific method for obtaining the pre-charge performance value of the lithium-ion battery is as follows:

[0042]

[0043] Where, ε represents the pre-charge performance value of the lithium-ion battery, T S Represents the precharge execution time, T S ′ represents the preset charging time, U S Represents the battery voltage rising rate, U S ′ represents the preset reference value of the battery voltage rising rate, I S Represents the battery current rising rate, I S ′ represents the preset battery current rising rate reference value, F S Represents the battery heating rate, F S ′ represents the preset reference value of the battery temperature rise rate, and e is a natural constant.

[0044] In this embodiment, the pre-charge execution time is the time consumed by the lithium-ion battery for pre-charging, the battery voltage rise rate is the rate of voltage rise of the lithium-ion battery during the pre-charge time, the battery current rise rate is the rate of current rise of the lithium-ion battery during the pre-charge time, and the battery temperature rise rate is the rate of temperature rise of the lithium-ion battery during the pre-charge time. The pre-charge execution time is directly obtained by timing, the battery voltage rise rate is obtained by the battery management system, the battery current rise rate is obtained by the battery management system, and the battery temperature rise rate is obtained by the battery management system. The pre-charge execution time reference value, battery voltage rise rate reference value, battery current rise rate reference value, and battery temperature rise rate reference value are obtained from the database.

[0045] In this embodiment, the precharge execution time, the battery voltage rise rate, the battery current rise rate, and the battery temperature rise rate all characterize the precharge health state of the lithium-ion battery. An abnormal precharge time may be a signal of battery aging or internal damage. Under normal circumstances, the battery voltage should rise at a steady rate during precharge. If the voltage rise rate is too fast, it may indicate a decline in the electrochemical performance of the battery. If the voltage rise is too slow, it usually indicates that the battery has a high internal resistance or some of the battery cells have deteriorated. Whether the battery voltage rise rate is too fast or too slow indicates that the battery may be in an unhealthy state. An abnormal battery current rise rate may mean that there is an abnormality inside the battery, and an abnormal temperature rise rate may be a sign of battery aging, damage, or abnormal state. The precharge execution time, the battery voltage rise rate, the battery current rise rate, and the battery temperature rise rate are all important indicators characterizing the precharge health state of the lithium-ion battery.

[0046] In this embodiment, the precharge execution time, the battery voltage rise rate, the battery current rise rate, and the battery temperature rise rate are interrelated and interact with each other. The battery voltage rise rate is directly related to the precharge execution time. When the precharge time is longer, the battery voltage rise rate is slower. On the contrary, if the precharge time is shorter, the battery voltage will rise faster, but it may bring the risk of overheating or battery damage. A too-fast rise in current will cause the battery voltage to rise rapidly, resulting in an increase in the battery current rise rate and may also cause an increase in the internal heat of the battery, thus affecting the battery temperature rise rate. The battery current rise rate and the voltage rise rate are often interrelated. A higher charging current often accelerates the rise of the voltage. When the battery voltage rise rate is faster, the internal chemical reaction of the battery accelerates, which may also lead to more heat generation. The faster the battery current rise rate, the more heat generated by the internal resistance of the battery, and the more significant the increase in the battery temperature. A longer precharge time usually charges at a lower current, which results in a slower battery temperature rise rate and reduces the rate of temperature rise.

[0047] Further, the initial-stage grading charge and continuous charge parameters of the lithium-ion battery are determined. The specific process is as follows: Obtain the pre-charge performance value of the lithium-ion battery, obtain the preset pre-charge performance threshold, compare the pre-charge performance value of the lithium-ion battery with the pre-charge performance threshold. When the pre-charge performance value of the lithium-ion battery is greater than or equal to the pre-charge performance threshold, perform grading charge and continuous charge on the lithium-ion battery with the default initial-stage grading charge and continuous charge parameters; when the pre-charge performance value of the lithium-ion battery is less than the pre-charge performance threshold, extract the difference between the pre-charge performance value and the pre-charge performance threshold of the lithium-ion battery, denoted as the grading charge and continuous charge adjustment value, and match the grading charge and continuous charge adjustment value of the lithium-ion battery with the initial-stage grading charge and continuous charge parameter adjustment values corresponding to each preset grading charge and continuous charge adjustment value interval in the database to obtain the initial-stage grading charge and continuous charge parameter adjustment value corresponding to the interval where the grading charge and continuous charge adjustment value of the lithium-ion battery is located, denoted as the initial-stage grading charge and continuous charge parameter adjustment value of the lithium-ion battery; perform an addition process on the default initial-stage grading charge and continuous charge parameters and the initial-stage grading charge and continuous charge parameter adjustment value of the lithium-ion battery to obtain the initial-stage grading charge and continuous charge parameters of the lithium-ion battery. The default initial-stage grading charge and continuous charge parameters are the default fast charge cut-off capacity value and the default constant voltage charge cut-off capacity value, and the initial-stage grading charge and continuous charge parameter adjustment value includes a fast charge cut-off capacity adjustment value and a constant voltage charge cut-off capacity adjustment value.

[0048] In this embodiment, the default initial-stage grading charge and continuous charge parameters are the default fast charge cut-off capacity value and the default constant voltage charge cut-off capacity value, which can be directly obtained from the data. The grading charge and continuous charge of the lithium-ion battery are divided into three stages. The first stage is the fast charge stage, the second stage is the constant voltage charge stage, and the third stage is the trickle charge stage. The initial-stage grading charge and continuous charge parameters are the cut-off capacity parameters for the staged continuous charge of the lithium-ion battery. The initial-stage grading charge and continuous charge parameters are used as the node values for the switching of the grading charge and continuous charge stages of the lithium-ion battery. When the capacity of the lithium-ion battery reaches the fast charge cut-off capacity value, the constant voltage charge stage can be switched. When the capacity of the lithium-ion battery reaches the constant voltage charge cut-off capacity value, it indicates that the lithium-ion battery is about to complete charging, and then enters the trickle charge stage until it is fully charged. In addition, the capacity of the lithium-ion battery can be obtained through the battery management system. It should be noted that when the pre-charge performance value of the lithium-ion battery is less than the pre-charge performance threshold, the pre-charge health state of the lithium-ion battery is unstable, and it is necessary to reduce the cut-off capacity parameters for the staged continuous charge of the lithium-ion battery. Therefore, the initial-stage grading charge and continuous charge parameter adjustment value of the lithium-ion battery is negative. When adding the default initial-stage grading charge and continuous charge parameters and the initial-stage grading charge and continuous charge parameter adjustment value of the lithium-ion battery, the default fast charge cut-off capacity value is added to the fast charge cut-off capacity adjustment value, and the default constant voltage charge cut-off capacity value is added to the constant voltage charge cut-off capacity adjustment value.

[0049] Furthermore, corresponding adjustment and control management are carried out based on the real-time monitoring results. The specific process is as follows: Obtain the environmental impact parameters and the continuous charging characteristic data of the lithium-ion battery during the formation and continuous charging process, determine the real-time formation and continuous charging stage of the lithium-ion battery, and obtain the comparison set of the real-time formation and continuous charging stage of the lithium-ion battery; Process the environmental impact parameters, the continuous charging characteristic data of the lithium-ion battery, and the comparison set of the real-time formation and continuous charging stage of the lithium-ion battery to obtain the continuous charging characteristic value of the lithium-ion battery; The environmental impact parameters include: environmental temperature, environmental humidity, and environmental atmospheric pressure; The continuous charging characteristic data of the lithium-ion battery include: real-time battery voltage, real-time battery current, battery internal resistance, and real-time battery temperature; Based on the continuous charging characteristic value of the lithium-ion battery, process to obtain the real-time monitoring result, and carry out corresponding adjustment and control management; The real-time monitoring result is real-time monitoring steady state or real-time monitoring anomaly.

[0050] In this embodiment, it should be noted that the formation and continuous charging stage of the lithium-ion battery is divided into a fast charging stage, a constant voltage charging stage, and a trickle charging stage. The comparison sets of the continuous charging characteristic data in the fast charging stage, the constant voltage charging stage, and the trickle charging stage are different. First, determine the stage where the lithium-ion battery is in the formation and continuous charging process, and then obtain the comparison set of the continuous charging characteristic data of this stage from the database. The comparison sets of the stages where the lithium-ion battery is in the formation and continuous charging process include: the fast continuous charging characteristic data comparison set in the fast charging stage, the constant voltage continuous charging characteristic data comparison set in the constant voltage charging stage, and the trickle continuous charging characteristic data comparison set in the trickle charging stage. The comparison set includes: real-time battery voltage comparison value, real-time battery current comparison value, battery internal resistance comparison value, real-time battery temperature comparison value, environmental temperature comparison value, environmental humidity comparison value, and environmental atmospheric pressure comparison value. In the fast charging stage, the lithium-ion battery is charged according to a preset constant continuous charging current in the database. In the constant voltage charging stage, the lithium-ion battery is continuously charged according to a preset constant voltage. In the trickle charging stage, the battery is micro-charged with a very low current to ensure that the battery is fully charged.

[0051] In this embodiment, the specific process of determining the stage where the lithium-ion battery is in the formation and continuous charging process is as follows: Real-time monitor the process of the lithium-ion battery in the formation and continuous charging process, obtain the real-time capacity value of the lithium-ion battery, compare the real-time capacity value of the lithium-ion battery with the initial formation and continuous charging parameters. When the real-time capacity value of the lithium-ion battery is less than the fast charging cut-off capacity value, the lithium-ion battery is in the fast charging stage. When the real-time capacity value of the lithium-ion battery is greater than or equal to the fast charging cut-off capacity value and less than the constant voltage charging cut-off capacity value, the lithium-ion battery is in the constant voltage charging stage. When the real-time capacity value of the lithium-ion battery is greater than or equal to the constant voltage charging cut-off capacity value, the lithium-ion battery is in the trickle charging stage.

[0052] In this embodiment, the specific method for obtaining the continuous charging characteristic value of the lithium-ion battery is as follows:

[0053]

[0054] where θ represents the recharge characteristic value of the lithium-ion battery, V T represents the real-time battery voltage, V T ′ represents the preset real-time battery voltage reference value, I T represents the real-time battery current, I T ′ represents the preset real-time battery current reference value, R S represents the battery internal resistance, R S ′ represents the preset battery internal resistance reference value, F T represents the real-time battery temperature, F T ′ represents the preset real-time battery temperature reference value, W T represents the ambient temperature, W T ′ represents the preset ambient temperature reference value, H T represents the ambient humidity, H T ′ represents the preset ambient humidity reference value, P T represents the ambient atmospheric pressure, P T ′ represents the preset ambient atmospheric pressure reference value, and e is the natural constant.

[0055] In this embodiment, the ambient temperature is the temperature of the environment where the battery is located, the ambient humidity is the content of water vapor in the air, the ambient atmospheric pressure is the atmospheric pressure in the environment where the battery is located. The ambient temperature can be obtained through a temperature sensor, the ambient humidity can be monitored by a relative humidity sensor to obtain the humidity of the environment, and the ambient atmospheric pressure can be obtained using a barometric pressure sensor. The real-time battery voltage is obtained through the battery management system, the real-time battery current is obtained through a current sensor, the battery internal resistance refers to the resistance to the flow of current inside the battery and is obtained through the battery management system, and the real-time battery temperature refers to the temperature of the battery body and is obtained through a temperature sensor. The real-time battery voltage reference value, the real-time battery current reference value, the battery internal resistance reference value, the real-time battery temperature reference value, the ambient temperature reference value, the ambient humidity reference value, and the ambient atmospheric pressure reference value are obtained from the database. In this embodiment, the ambient temperature, the ambient humidity, the ambient atmospheric pressure, the real-time battery voltage, the real-time battery current, the battery internal resistance, and the real-time battery temperature are all important factors affecting the lithium-ion charging process. The ambient temperature is crucial for thermal management during the battery charging process. An overly high or low ambient temperature may affect the charging efficiency and safety of the battery, and may even cause the battery to overheat or be damaged by excessive cold, resulting in a decrease in the recharge characteristic value of the lithium-ion battery. Excessively high humidity may cause problems such as short circuits and corrosion of the battery housing or circuit, while too low humidity has less direct impact on battery performance, leading to a decrease in the recharge characteristic value of the lithium-ion battery. Abnormal ambient atmospheric pressure may cause the lithium-ion battery to expand or its performance to decline, resulting in a decrease in the recharge characteristic value of the lithium-ion battery. An overly high real-time battery voltage may cause overcharging of the battery, while an overly low real-time battery voltage may cause the battery to not be fully charged or have a low charging efficiency. An overly large real-time battery current will cause the battery to overheat, and an overly low real-time battery current will result in a decrease in charging efficiency. Abnormal battery internal resistance may cause more heat to be generated during charging, the battery may overheat as a result, and it will also lead to a decrease in the battery charging efficiency. The real-time battery temperature has a significant impact on its charging performance. When the battery temperature is too high, the chemical reactions during the charging process will accelerate, which may cause the battery to overheat and the capacity attenuation to intensify. When the real-time battery temperature is too low, the lithium-ion migration speed slows down, the charging efficiency is low, and the battery may not be fully charged or may exhibit unstable performance.

[0056] In this embodiment, the ambient temperature, ambient humidity, ambient atmospheric pressure, real-time battery voltage, real-time battery current, battery internal resistance, and real-time battery temperature affect each other. The ambient temperature has an important impact on the voltage and current output of the battery. At low temperatures, the chemical reaction rate inside the battery slows down, resulting in a decrease in the voltage and current output of the battery. In a high-temperature environment, the chemical reaction accelerates, and the current of the battery may increase. The internal resistance of the battery usually decreases with the increase in temperature. At high temperatures, the conductivity of the battery electrolyte increases, resulting in a decrease in internal resistance. At low temperatures, the internal resistance increases, which may lead to a decrease in battery efficiency. The temperature of the battery itself is affected by the ambient temperature. When the ambient temperature is high, the heat of the battery may not be effectively dissipated, resulting in an increase in the battery temperature. High humidity may affect the conductivity of the internal materials of the battery, thereby affecting the internal resistance of the battery. When the real-time battery current increases, the voltage of the battery will drop to a certain extent. The real-time voltage, current, and internal resistance of the battery directly reflect the working state of the battery, and they are affected by environmental factors.

[0057] Further, the real-time monitoring result is obtained. The specific process is as follows: Obtain the recharge characteristic value of the lithium-ion battery, obtain the preset recharge characteristic threshold, compare the recharge characteristic value of the lithium-ion battery with the recharge characteristic threshold. When the recharge characteristic value of the lithium-ion battery is greater than or equal to the recharge characteristic threshold, the real-time monitoring result of the real-time grading recharge stage of the lithium-ion battery is real-time monitoring steady state. When the recharge characteristic value of the lithium-ion battery is less than the recharge characteristic threshold, the real-time monitoring result of the real-time grading recharge stage of the lithium-ion battery is real-time monitoring abnormal.

[0058] In this embodiment, the fast charging stage charges the lithium-ion battery according to the preset constant recharge current in the database. It should be noted that when the lithium-ion battery is in the fast charging stage, constant voltage charging stage, and trickle charging stage respectively, the recharge characteristic values of the fast charging stage, constant voltage charging stage, and trickle charging stage of the lithium-ion battery need to be compared with the recharge characteristic thresholds of the fast charging stage, constant voltage charging stage, and trickle charging stage of the lithium-ion battery.

[0059] Further, corresponding adjustment control management is carried out. The specific process is as follows: When the real-time monitoring result in the real-time grading charge and continuous charge stage of the lithium-ion battery is in a real-time monitoring steady state, no adjustment operation is performed, and the lithium-ion battery continues to be charged with the current continuous charge current. When the real-time monitoring result in the real-time grading charge and continuous charge stage of the lithium-ion battery is in a real-time monitoring anomaly, the difference between the continuous charge characteristic value and the continuous charge characteristic threshold of the lithium-ion battery is extracted, denoted as the continuous charge current adjustment value, and the continuous charge current adjustment value is matched with the continuous charge current reduction values corresponding to each preset continuous charge current adjustment value interval in the database to obtain the continuous charge current reduction value corresponding to the interval where the continuous charge current adjustment value is located, denoted as the continuous charge current reduction value of the lithium-ion battery; The continuous charge current of the lithium-ion battery is obtained by subtracting the continuous charge current reduction value of the lithium-ion battery from the real-time continuous charge current, and adjustment control is carried out.

[0060] In this embodiment, when extracting the difference between the continuous charge characteristic value of the lithium-ion battery and the continuous charge characteristic threshold in the real-time grading charge and continuous charge stage of the lithium-ion battery, it is necessary to extract the difference between the continuous charge characteristic value of the lithium-ion battery and the continuous charge characteristic threshold corresponding to its current stage. In addition, when the real-time monitoring result of the lithium-ion battery is in a real-time monitoring anomaly, the charging current of the lithium-ion battery needs to be slowed down to ensure the charging state of the lithium-ion battery, so the continuous charge current reduction value of the lithium-ion battery is subtracted. In this embodiment, the continuous charge current is adjusted by obtaining the continuous charge current adjustment value of the lithium-ion battery. The improper charging current can be adjusted in time to achieve precise control of the charging process of the lithium-ion battery.

[0061] The charging control device for a lithium-ion battery provided in the embodiment of the present application includes: a battery performance acquisition module, a pre-charge module, a grading charge and continuous charge module, and an adjustment module: The battery performance analysis module: is used for the pre-charge controller to sense the charging trigger signal of the lithium-ion battery and start the battery performance sensor to retrieve the performance characterization parameters of the lithium-ion battery for processing to obtain the performance characterization coefficient of the lithium-ion battery; The pre-charge module: is used to analyze and obtain the pre-charge execution condition information of the lithium-ion battery based on the performance characterization coefficient of the lithium-ion battery, and activate the power storage controller to perform pre-charge processing on the lithium-ion battery with the pre-charge execution condition information, and synchronously monitor the pre-charge performance data of the lithium-ion battery; The grading charge and continuous charge module: is used to process based on the pre-charge performance data of the lithium-ion battery to determine the initial-stage grading charge and continuous charge parameters of the lithium-ion battery, and perform grading charge and continuous charge control on the lithium-ion battery with the initial-stage grading charge and continuous charge parameters through the power storage controller; The adjustment module: is used to monitor the process of the grading charge and continuous charge control of the lithium-ion battery in real time, obtain the real-time monitoring result, and perform corresponding adjustment control management.

[0062] In summary, the embodiments of the present application obtain and analyze the performance characterization coefficients of the lithium-ion battery to obtain the pre-charging execution condition information, and perform pre-charging based on the pre-charging execution condition information, effectively ensuring the rationality of the pre-charging execution conditions of the lithium-ion battery, reducing the damage to the lithium-ion battery caused by unreasonable pre-charging execution, and monitoring the pre-charging performance data for analysis to determine the initial stage grading and continuous charging parameters, which can accurately and effectively adjust the initial stage grading and continuous charging parameters of the lithium-ion battery in a timely manner according to the pre-charging situation of the lithium-ion battery, improving the charging efficiency of the lithium-ion battery. Then, the process of grading and continuous charging control is monitored in real time and corresponding adjustment control management is carried out, which can adjust the charging situation of the lithium-ion battery in a timely and accurate manner, reduce the damage to the lithium-ion battery, and improve the service life of the lithium-ion battery.

[0063] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0064] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0065] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means realizes the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or combinations of blocks.

[0066] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions for implementing the process Figure 1 in one process or a plurality of processes and / or boxes Figure 1 steps for the functions specified in one box or a plurality of boxes.

[0067] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn of the basic creative concept. Therefore, the appended claims are intended to be construed to cover the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A charging control method for a lithium-ion battery, characterized in that, Including the following steps: The pre-charge controller senses the charging trigger signal of the lithium-ion battery and activates the battery performance sensor to retrieve the performance characterization parameters of the lithium-ion battery for processing, obtaining the performance characterization coefficient of the lithium-ion battery; Based on the performance characterization coefficient of the lithium-ion battery, analyze to obtain the pre-charge execution condition information of the lithium-ion battery, and activate the power storage controller to perform pre-charge processing on the lithium-ion battery with the pre-charge execution condition information, and simultaneously monitor the pre-charge performance data of the lithium-ion battery; Process the pre-charge performance data of the lithium-ion battery to determine the initial stage partial charge and continuous charge parameters of the lithium-ion battery, and control the partial charge and continuous charge of the lithium-ion battery through the power storage controller with the initial stage partial charge and continuous charge parameters; Real-time monitor the process of controlling the partial charge and continuous charge of the lithium-ion battery, and perform corresponding adjustment control management based on the real-time monitoring results; The specific process of activating the battery performance sensor to retrieve the performance characterization parameters of the lithium-ion battery for processing is as follows: Activate the battery performance sensor to obtain the performance characterization parameters of the lithium-ion battery, and process them in combination with the preset performance characterization parameter comparison set of the lithium-ion battery to obtain the performance characterization coefficient of the lithium-ion battery; The performance characterization parameters of the lithium-ion battery include: battery open-circuit voltage, battery initial internal resistance, battery current full-load capacity, battery rated capacity, and battery historical average operating temperature; The performance characterization coefficient of the lithium-ion battery is used to characterize the current basic performance of the lithium-ion battery; The specific acquisition method of the performance characterization coefficient of the lithium-ion battery is as follows: In the formula, α represents the performance characterization coefficient of the lithium-ion battery, U represents the battery open-circuit voltage, U′ represents the preset battery open-circuit voltage reference value, R represents the battery initial internal resistance, R′ represents the preset battery initial internal resistance reference value, Q represents the battery current full-load capacity, Q′ represents the battery rated capacity, T represents the battery historical average operating temperature, T′ represents the preset battery historical average operating temperature reference value, and e is the natural constant.

2. The charging control method for a lithium-ion battery according to claim 1, characterized in that, The specific process of analyzing to obtain the pre-charge execution condition information of the lithium-ion battery is as follows: Obtain the performance characterization coefficient of the lithium-ion battery, match the performance characterization coefficient of the lithium-ion battery with the pre-charge execution condition information corresponding to each preset performance characterization coefficient interval, and obtain the pre-charge execution condition information corresponding to the interval where the performance characterization coefficient of the lithium-ion battery is located, denoted as the pre-charge execution condition information of the lithium-ion battery; The pre-charge execution condition information of the lithium-ion battery specifically includes: pre-charge current and preset charging time.

3. The charging control method for a lithium-ion battery according to claim 1, characterized in that, The specific process of processing based on the pre-charge performance data of the lithium-ion battery is as follows: Perform pre-charge on the lithium-ion battery with the pre-charge execution condition information, obtain the pre-charge performance data of the lithium-ion battery, and analyze the pre-charge performance data of the lithium-ion battery to obtain the pre-charge performance value of the lithium-ion battery; The pre-charge performance value of the lithium-ion battery is used to characterize the pre-charge health state of the lithium-ion battery; The pre-charge performance data of the lithium-ion battery includes: pre-charge execution time, battery voltage rise rate, battery current rise rate, and battery temperature rise rate.

4. The charging control method for a lithium-ion battery according to claim 1, characterized in that, The specific process of determining the initial stage partial charge and continuous charge parameters of the lithium-ion battery is as follows: Obtain the pre-charging performance value of the lithium-ion battery, obtain the preset pre-charging performance threshold, compare the pre-charging performance value of the lithium-ion battery with the pre-charging performance threshold, and when the pre-charging performance value of the lithium-ion battery is greater than or equal to the pre-charging performance threshold, perform grading and continuous charging on the lithium-ion battery with the default initial grading and continuous charging parameters; When the pre-charging performance value of the lithium-ion battery is less than the pre-charging performance threshold, extract the difference between the pre-charging performance value of the lithium-ion battery and the pre-charging performance threshold, record it as the grading and continuous charging adjustment value, and match the grading and continuous charging adjustment value of the lithium-ion battery with the initial grading and continuous charging parameter adjustment values corresponding to each preset grading and continuous charging adjustment value interval in the database to obtain the initial grading and continuous charging parameter adjustment value corresponding to the interval where the grading and continuous charging adjustment value of the lithium-ion battery is located, and record it as the initial grading and continuous charging parameter adjustment value of the lithium-ion battery; Perform an addition process on the default initial grading and continuous charging parameters and the initial grading and continuous charging parameter adjustment value of the lithium-ion battery to obtain the initial grading and continuous charging parameters of the lithium-ion battery. The default initial grading and continuous charging parameters are the default fast charging cut-off capacity value and the default constant voltage charging cut-off capacity value, and the initial grading and continuous charging parameter adjustment value includes a fast charging cut-off capacity adjustment value and a constant voltage charging cut-off capacity adjustment value.

5. The charging control method for a lithium-ion battery according to claim 1, wherein, The process of performing corresponding adjustment control management on the obtained real-time monitoring results is as follows: Obtain the environmental impact parameters during the grading and continuous charging process of the lithium-ion battery and the continuous charging characteristic data of the lithium-ion battery, determine the real-time grading and continuous charging stage of the lithium-ion battery, and obtain the control set of the real-time grading and continuous charging stage of the lithium-ion battery; Process the environmental impact parameters during the grading and continuous charging process of the lithium-ion battery, the continuous charging characteristic data of the lithium-ion battery, and the control set of the real-time grading and continuous charging stage of the lithium-ion battery to obtain the continuous charging characteristic value of the lithium-ion battery; The environmental impact parameters include: environmental temperature, environmental humidity, and environmental atmospheric pressure; The continuous charging characteristic data of the lithium-ion battery includes: battery real-time voltage, battery real-time current, battery internal resistance, and battery real-time temperature; Based on the continuous charging characteristic value of the lithium-ion battery, process to obtain the real-time monitoring result and perform corresponding adjustment control management; The real-time monitoring result is real-time monitoring steady state or real-time monitoring anomaly.

6. The charging control method for a lithium-ion battery according to claim 5, wherein The process of processing to obtain the real-time monitoring result is as follows: Obtain the continuous charging characteristic value of the lithium-ion battery, obtain the preset continuous charging characteristic threshold, compare the continuous charging characteristic value of the lithium-ion battery with the continuous charging characteristic threshold, and when the continuous charging characteristic value of the lithium-ion battery is greater than or equal to the continuous charging characteristic threshold, the real-time monitoring result of the real-time grading and continuous charging stage of the lithium-ion battery is real-time monitoring steady state, and when the continuous charging characteristic value of the lithium-ion battery is less than the continuous charging characteristic threshold, the real-time monitoring result of the real-time grading and continuous charging stage of the lithium-ion battery is real-time monitoring anomaly.

7. The charging control method for a lithium-ion battery according to claim 5, wherein The process of performing corresponding adjustment control management is as follows: When the real-time monitoring result in the real-time grading charge and continuous charge stage of the lithium-ion battery is in the real-time monitoring steady state, no adjustment operation is performed, and the lithium-ion battery continues to be charged with the current continuous charge current. When the real-time monitoring result in the real-time grading charge and continuous charge stage of the lithium-ion battery is in the real-time monitoring abnormal state, the difference between the continuous charge characteristic value and the continuous charge characteristic threshold of the lithium-ion battery is extracted, denoted as the continuous charge current adjustment value, and the continuous charge current adjustment value is matched with the continuous charge current reduction values corresponding to each preset continuous charge current adjustment value interval in the database to obtain the continuous charge current reduction value corresponding to the interval where the continuous charge current adjustment value is located, denoted as the continuous charge current reduction value of the lithium-ion battery; Subtract the continuous charge current reduction value of the lithium-ion battery from the real-time continuous charge current to obtain the continuous charge current of the lithium-ion battery, and perform adjustment control.

8. A charging control device for a lithium-ion battery, which applies the charging control method for a lithium-ion battery according to any one of claims 1-7, characterized in that, It includes a battery performance acquisition module, a pre-charge module, a grading charge and continuous charge module, and an adjustment module: Battery performance analysis module: It is used for the pre-charge controller to sense the charging trigger signal of the lithium-ion battery, and start the battery performance sensor to retrieve and process the performance characterization parameters of the lithium-ion battery to obtain the performance characterization coefficient of the lithium-ion battery; Pre-charge module: It is used to analyze and obtain the pre-charge execution condition information of the lithium-ion battery based on the performance characterization coefficient of the lithium-ion battery, and activate the power storage controller to perform pre-charge processing on the lithium-ion battery with the pre-charge execution condition information, and simultaneously monitor the pre-charge performance data of the lithium-ion battery; Grading charge and continuous charge module: It is used to process based on the pre-charge performance data of the lithium-ion battery, determine the initial-stage grading charge and continuous charge parameters of the lithium-ion battery, and use the power storage controller to perform grading charge and continuous charge control on the lithium-ion battery with the initial-stage grading charge and continuous charge parameters; Adjustment module: It is used to monitor the process of the grading charge and continuous charge control of the lithium-ion battery in real time, obtain the real-time monitoring result, and perform corresponding adjustment control management.

Images