Lithium battery charging method, system, product, medium and equipment

Abstract

The invention relates to the technical field of battery charging, in particular to a lithium battery charging method and system, a product, a medium and equipment. Comprising the steps of obtaining lithium battery parameters, and calculating switching electric quantity, first charging current, second charging current and cut-off voltage based on the lithium battery parameters; when the lithium battery is charged, the current SOC value and the current voltage of the lithium battery are collected; if the current SOC value is smaller than the switching electric quantity, charging according to a constant first charging current until the current SOC value is not smaller than the switching electric quantity; if the current SOC value is not less than the switching electric quantity, charging according to a constant second charging current until the current voltage of the lithium battery is not less than the cut-off voltage; and if the current voltage of the lithium battery is not less than the cut-off voltage, stopping charging. Through parameterization calculation, staged charging and temperature compensation, the charging performance is improved, the service life of the battery is prolonged, and the system reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of battery charging technology, specifically to a lithium battery charging method, system, product, medium, and equipment. Background Technology

[0002] Current lithium batteries use a constant current and constant voltage charging method. During the charging process, the battery is first charged with a constant current. When the charging voltage reaches its maximum, the constant current charging ends and constant voltage charging begins.

[0003] However, existing constant current charging methods use a small current of approximately 0.2 times the battery's rated capacity (C) per hour. Therefore, both the constant current and constant voltage stages involve low-current charging, resulting in excessively long charging times. Given the characteristics of lithium batteries, prolonged charging inevitably reduces battery lifespan and impacts battery safety.

[0004] To address this issue, a lithium battery charging method and apparatus has been proposed. Specifically, it employs a first constant current charging method to pre-charge the battery until the battery activity conditions are met, with the pre-charging time ranging from 0.5 to 10 minutes. Then, it uses a second constant current charging method to charge the battery, ending the constant current charging when the battery terminal voltage reaches a critical voltage lower than the charging limit voltage. The first constant current is less than the second constant current. The current charging current of the battery is gradually reduced while charging continues until the battery terminal voltage reaches the maximum charging limit voltage. Finally, a constant voltage charging method with the voltage at the maximum charging limit voltage is used to continue charging the battery. The constant voltage charging ends when the current charging current decreases to a set charging cutoff current value. This method first pre-charges the battery to activate the active materials within it, avoiding the risk of battery damage that can occur with direct high constant current charging. Then, it uses a high current constant voltage charging method to fully charge the battery in a short time, significantly reducing the degradation of electrode materials and thus extending battery life and effectively improving battery safety.

[0005] However, some problems exist in practical applications. Currently, charging typically involves charging the battery to 100%, meaning the battery's State of Charge (SOC) reaches nearly 100% before stopping. Extensive testing has shown that charging a lithium battery to nearly 100% and then discharging it to form a cycle results in a shorter cycle life compared to charging it to nearly 90%. This demonstrates that overcharging is detrimental to battery lifespan. Therefore, in practical applications, a charging method that improves the cycle life of lithium batteries needs to be designed. Summary of the Invention

[0006] The purpose of this application is to address the shortcomings of the aforementioned background technology and provide a lithium battery charging method, system, product, medium, and device.

[0007] The technical solution of this application is: a lithium battery charging method, comprising, Obtain lithium battery parameters, and calculate the switching capacity, first charging current, second charging current, and cutoff voltage based on the lithium battery parameters; During lithium battery charging, the current SOC value and current voltage of the lithium battery are collected; If the current SOC value is less than the switching capacity, then charge at a constant first charging current until the current SOC value is not less than the switching capacity. If the current SOC value is not less than the switching capacity, then charge according to the constant second charging current until the current voltage of the lithium battery is not less than the cutoff voltage. If the current voltage of the lithium battery is not lower than the cutoff voltage, charging will stop. The first charging current is greater than the second charging current; the switching capacity is less than 100%; and the cutoff voltage is less than the voltage when the lithium battery's SOC value is 100%.

[0008] According to a lithium battery charging method provided in this application, the method for calculating the first charging current based on lithium battery parameters includes: calculating the first charging current according to the following formula. in: I 1 —First charging current; k 1 —The first coefficient is less than 1; C rated —Rated capacity of lithium battery; I max —Maximum allowable charging current for lithium batteries.

[0009] According to the lithium battery charging method provided in this application, the method for calculating the second charging current based on lithium battery parameters includes: in: I 2 —Second charging current; k 2 —The second coefficient is less than k 1 ; C rated —Rated capacity of lithium battery.

[0010] According to a lithium battery charging method provided in this application, the method for calculating the switching capacity based on lithium battery parameters includes: calculating the switching capacity according to the following formula. in: A — Switch power levels; R cell —Internal resistance of lithium battery; C rated —Rated capacity of lithium battery; V max —Maximum allowable charging voltage for lithium batteries; V min —Minimum operating voltage of lithium batteries; T —Current temperature of the lithium battery; T ref Standard temperature; α —First temperature compensation coefficient.

[0011] According to a lithium battery charging method provided in this application, the method for calculating the cutoff voltage based on lithium battery parameters includes: calculating the cutoff voltage according to the following formula. in: V cutoff —Lithium battery cutoff voltage; OCV a —The voltage value of a lithium battery when its SOC value is 'a', where 'a' is between 90% and 100%; T —Current temperature of the lithium battery; T ref Standard temperature; β —Second temperature compensation coefficient.

[0012] According to the lithium battery charging method provided in this application, the first coefficient is 0.9~0.98; the second coefficient is 0.2~0.3.

[0013] This application relates to a lithium battery charging system, which charges a lithium battery according to the aforementioned lithium battery charging method, including... The parameter acquisition module is used to acquire lithium battery parameters and calculate the switching capacity, first charging current, second charging current and cutoff voltage based on the lithium battery parameters. The acquisition module is used to acquire the current SOC value and current voltage of the lithium battery in real time during lithium battery charging. The first judgment module is used to compare the current SOC value with the switching power. The first execution module charges the battery with a constant first charging current when the current SOC value is less than the switching power. The second execution module charges the battery with a constant second charging current when the current SOC value is not less than the switching capacity. The second judgment module is used to compare the current voltage of the lithium battery with the cutoff voltage. The third execution module is used to stop charging when the current voltage of the lithium battery is not less than the cutoff voltage; The first charging current is greater than the second charging current; the switching capacity is less than 100%; and the cutoff voltage is less than the voltage when the lithium battery's SOC value is 100%.

[0014] This application relates to a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the above-described lithium battery charging method.

[0015] This application relates to a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the above-described lithium battery charging method.

[0016] This application relates to an apparatus comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the lithium battery charging method described above.

[0017] The advantages of this application are as follows: 1. This application adopts a staged charging strategy. When the battery SOC value is low, a larger first charging current is used for constant current charging, which quickly increases the battery capacity and reduces the overall charging time. At the same time, after the SOC value reaches the switching capacity, it switches to a smaller second charging current, avoiding the problem of decreased charging efficiency in the later stage. The switching capacity setting is less than 100%, which means that the charging is switched to a small current before the battery is fully charged, reducing the stress on the battery under high voltage, preventing overcharging and lithium deposition, thereby slowing down battery aging and extending cycle life. The cutoff voltage is set to be less than the voltage when the lithium battery SOC value is 100%, ensuring that the charging process will not exceed the battery's safe voltage range, preventing risks such as overheating, short circuit or explosion. The whole method achieves precise charging control by monitoring SOC and voltage in real time. Based on the dynamic calculation of key values ​​(such as switching capacity, charging current and cutoff voltage) based on lithium battery parameters, the method can adapt to batteries of different models, capacities and states, improving versatility and practicality. 2. This application calculates the first charging current using a formula, which takes into account both the battery's rated capacity and limits the maximum allowable charging current, avoiding overcurrent charging and protecting the battery from damage. Using a first coefficient (less than 1) allows the charging current to be adjusted according to battery characteristics. For example, different first coefficients can be set for high-rate batteries or ordinary batteries to balance charging speed and battery health, improving the applicability of the method. The formula is simple and easy to implement in embedded systems or charging controllers, reducing computational complexity and improving response speed. 3. The second charging current in this application is calculated using a formula, and the second coefficient is less than the first coefficient. This ensures that a smaller constant current is used in the later stages of charging, reducing internal resistance heating and chemical side reactions in the battery, and preventing battery bulging or capacity decay. The second charging current in this application is calculated based on the rated capacity, ensuring that the charging current matches the battery specifications and avoiding the uncertainty caused by randomly setting the current, making the charging process more stable and controllable. The small current charging in the later stages of charging reduces energy loss and improves charging efficiency when the battery is close to full charge. At the same time, it provides a "trickle charging" effect for the battery, which helps to balance the battery. 4. The switching power calculation formula of this application comprehensively considers the battery's internal resistance, rated capacity, and voltage range, enabling the switching point to be adjusted according to the actual state of the battery and optimizing the timing of the charging phase transition. This application eliminates the impact of temperature changes on battery performance by introducing a temperature compensation coefficient and a standard temperature. For example, it automatically adjusts the switching power at low temperatures to prevent undercharging or overcharging, thereby improving charging accuracy and battery safety. This application calculates the switching power using internal resistance and voltage parameters, ensuring that the switching current is in a healthy battery state, reducing the long-term damage of high current to the battery, and is especially suitable for high-rate batteries or aging batteries. 5. The cutoff voltage calculation formula of this application takes into account the open circuit voltage and temperature compensation under a specific SOC, so that the cutoff voltage is closer to the actual full charge state of the battery and prevents overcharging or undercharging; by adjusting the cutoff voltage through the first temperature coefficient, it adapts to the voltage characteristics of the battery in different environments, such as reducing the cutoff voltage at high temperatures to avoid the risk of thermal runaway; it is applicable to multi-cell battery packs, ensuring balanced charging of series-connected batteries and reducing problems caused by inconsistency between batteries. 6. The first coefficient range of this application is 0.9~0.98, ensuring that the first charging current is close to the maximum allowable value of the battery, thus achieving fast charging; the second coefficient range is 0.2~0.3, making the second charging current sufficiently small to protect the battery from damage in the later stages of charging. This coefficient range is optimized to maximize battery life while ensuring efficiency; this range is based on experimental data or industry standards, providing a reliable operating window, reducing design uncertainty, and making the method easier to deploy in practical applications. 7. This application also relates to a charging system. The system of this application features a modular design, making it easy to integrate. The system includes a parameter acquisition module, a data acquisition module, a judgment module, and an execution module, etc. Each module has a clear division of labor, making it easy to implement in hardware or software, thus improving the maintainability and scalability of the system. The system of this application automatically judges and executes the switching of charging stages by collecting SOC and voltage in real time, thereby achieving fully automated charging, reducing manual intervention, and improving user experience and system reliability. The system of this application can adapt to various lithium battery types and charging scenarios, such as electric vehicles and consumer electronics, and has wide applicability. 8. This application also relates to a program product. The program product of this application implements the charging method through a computer program, which can be easily integrated into existing charging equipment or battery management system without hardware modification, thus reducing upgrade costs. As a program product, the algorithm can be quickly updated through a network or storage medium to adapt to new battery technologies or specifications, thus maintaining technological advancement. 9. This application also relates to a storage medium. The storage medium of this application has persistent storage and reliability. The computer-readable storage medium (such as ROM, Flash) ensures the stable storage of the charging program, prevents data loss, and guarantees the long-term reliable operation of the charging system. The storage medium can be easily installed on different devices, supports multiple platforms, and improves the accessibility of the method. 10. This application also relates to a device, which includes a memory, a processor, and a computer program, providing a complete charging solution that can be used in smartphones, charging piles, or battery management systems, etc., and is highly practical; the device processor executes the charging program, realizing rapid data analysis and real-time control, ensuring the accuracy and safety of the charging process.

[0018] The lithium battery charging method of this application improves charging performance, battery life and system reliability through parameterized calculation, staged charging and temperature compensation. Attached Figure Description

[0019] Figure 1 : A schematic diagram of the lithium battery charging method of this application; Figure 2 : A schematic diagram of the lithium battery charging device of this application. Detailed Implementation

[0020] The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] This application relates to a lithium battery charging method. The method involves charging the battery in stages using different constant currents based on its real-time state, and stopping charging when the voltage reaches a preset safety cutoff point. This ensures rapid charging at low battery levels, reducing charging time, while preventing overcharging at high battery levels, thus extending the cycle life of the lithium battery.

[0025] Specifically, such as Figure 1 As shown, a lithium battery charging method of this application includes the following steps: S1. Obtain the basic parameters of the lithium battery to be charged, such as rated capacity and maximum allowable charging current; based on these basic parameters, calculate or look up the required switching power for this charging cycle. A First charging current I 1 Second charging current I 2 and cutoff voltage V cutoff ; S2. During the charging process, the current SOC value and current voltage of the lithium battery are collected in real time through the battery management system; S3. Compare the current SOC value with the switched battery level. A ; If the current SOC value is less than the switching power level A Then control the charging power supply to maintain a constant first charging current. I 1 Charge the battery; If the current SOC value is greater than or equal to the switching power level A Then the charging power supply is switched to a constant second charging current. I 2 Charge the battery; S4. During the second stage of charging, continuously compare the current battery voltage with the cutoff voltage. Vcutoff ; If the current voltage is greater than or equal to the cutoff voltage V cutoff If the charging circuit is interrupted, charging will stop immediately.

[0026] The first charging current I 1 Greater than the second charging current I 2 The switching power A Less than 100%; the cutoff voltage V cutoff The voltage is less than the SOC value of a lithium battery at 100%.

[0027] Lithium batteries can withstand high charging currents when their charge is low without easily being damaged. Using a high current (initial charging current) at this stage can quickly increase the charge and shorten charging time. However, once the charge reaches a certain critical point (switching charge levels), battery polarization and internal resistance heating intensify. Continuing to use a high current at this point will damage battery life and pose safety hazards. Therefore, a smaller current (secondary charging current) is used to "recharge" the battery until the voltage slowly rises to a carefully set cutoff voltage. This cutoff voltage is not the theoretical 100% full charge voltage, but slightly lower (e.g., 95%), sacrificing a small amount of charge to significantly improve battery life and safety.

[0028] This application employs a dual control strategy of "fast charging followed by slow charging" combined with voltage cutoff to effectively extend battery cycle life while ensuring charging speed. This is achieved by controlling the switching point... A Setting it to less than 100% avoids using a large current at the end of the battery's chemical stress period; by setting the cutoff voltage to less than the voltage at 100% SOC, the battery is prevented from being in a fully charged high-voltage state for a long time, thus significantly improving the safety and reliability of the battery for long-term use.

[0029] In some embodiments of this application, step S1 described above has been optimized. Specifically, this embodiment specifically defines how to calculate the first charging current based on lithium battery parameters. I 1 Specifically, the first charging current I 1 Take "coefficient" k 1 Multiply by rated capacity C rated "and "maximum allowable charging current of battery" I max The smaller of the two values ​​is calculated using the following formula: in: I 1 —First charging current, mA; k 1 —The first coefficient is less than 1, and in practical applications it is 0.9. ~0.98 ; C rated —Rated capacity of lithium battery, mAh; I max —Maximum allowable charging current for lithium batteries, mA.

[0030] The above formula embodies the principle of dual protection. It sets a theoretically safe and efficient charging current value based on the battery capacity (for example, for a 5000mAh battery, the first coefficient...). k 1 Taking 0.95, the current would be approximately 4.75A. However, the battery itself or the manufacturer may specify an absolute upper limit. I max (For example, 5A). Taking the minimum of the two values ​​ensures that the charging current will not exceed the physical limit of the battery under any circumstances, which is the essence of overcurrent protection.

[0031] In practical applications, the rated capacity of the lithium battery is read from the battery's BMS or database. C rated and the maximum allowable charging current of lithium batteries I max The value; call the preset first coefficient. k 1 (e.g., 0.95); Calculate ,Compare It is the maximum allowable charging current of lithium batteries. I max The smaller value is ultimately assigned to the first charging current. I 1 This serves as the charging current for the first stage.

[0032] First charging current I 1 The calculation method ensures absolute safety during the charging process, fundamentally preventing the risk of battery overheating, bulging, or even thermal runaway caused by excessive current. At the same time, it considers charging efficiency, using the largest possible current within the battery's tolerance range, thus balancing charging speed and battery health.

[0033] In other embodiments of this application, step S1 described above has been optimized. Specifically, this embodiment specifically defines how to calculate the second charging current based on lithium battery parameters. I 2 Specifically, the second charging current I 2 Equal to the second coefficient k 2 Multiply by the rated capacity of the lithium battery C rated .

[0034] Calculate the second charging current using the following formula. in: I 2 —Second charging current, mA; k 2 —The second coefficient is less than k 1 In practical applications, it is 0.2. ~0.3 ; C rated —Rated capacity of lithium battery, mAh.

[0035] Towards the end of the charging process, the battery's chemical activity is nearing saturation. The key objective at this point is to charge the battery "gently" to near full capacity, rather than focusing on speed. Therefore, the second charging current... I 2 It is set to be much smaller than the first charging current. I 1 a constant value (because) k 2 <k 1 This current value is often referred to as the equivalent constant current mode of "trickle charging" or "constant voltage supplemental current". It can effectively reduce the heat generated by the battery's internal resistance, alleviate polarization, and allow lithium ions to be inserted into the electrodes more smoothly.

[0036] In practical applications, the rated capacity of the lithium battery is read from the battery's BMS or database. C rated Call the preset second coefficient k 2 (e.g., 0.25); Calculate the second charging current. I 2 And use it as the charging current for the second stage.

[0037] This embodiment sets a smaller second charging current that is proportional to the battery capacity. I 2 This embodiment significantly reduces the chemical stress on the battery at the end of the charging process. This helps to reduce the rate of battery capacity degradation, extend battery life, and improve safety at the end of the charging process.

[0038] In a further embodiment of this application, step S1 described above is further optimized. Specifically, this embodiment provides a method for dynamically calculating switching power. A The method, whose calculation formula comprehensively considers the battery's internal resistance, capacity, voltage range, and current temperature.

[0039] Calculate the switching power consumption using the following formula. in: A — Switching battery level, % R cell —Internal resistance of lithium battery, Ω; C rated —Rated capacity of lithium battery, mAh; V max —Maximum allowable charging voltage of lithium battery, V; V min—Minimum operating voltage of lithium battery, V; T —Current temperature of the lithium battery, °C; T ref —Standard temperature, °C, is generally taken as 25 °C, but is not limited to this value in actual applications; α —First temperature compensation coefficient, , calibrated and obtained.

[0040] Switching power A It is not a fixed value, but varies with the battery's state (especially internal resistance and temperature). Lithium-ion battery internal resistance R cell The higher the current, the more severe the heat generation under the same current, requiring an earlier switch to a lower current. Current temperature of the lithium battery. T It directly affects the battery's internal resistance and chemical reaction rate; when the temperature is too low, the battery activity is poor, and if it is still charged with a large current, it is easy to cause lithium metal deposition (lithium plating). Therefore, a temperature compensation term is used. 1 / (1+α(TT ref )) Automatically reduce switching power at low temperatures A It enters a gentle charging phase in advance to prevent damage.

[0041] In practical applications, the internal resistance of the lithium battery is obtained. R cell lithium battery rated capacity C rated Maximum allowable charging voltage of lithium battery V max Minimum operating voltage of lithium batteries V min Current temperature of the lithium battery T Standard temperature T ref and the first temperature compensation coefficient α Among them, the internal resistance of lithium batteries R cell This can be the factory calibration value or the BMS real-time estimate; current temperature of the lithium battery. T The temperature is collected in real time by the BMS; substituting the above parameters into the formula, the switching power is calculated. A The value (in %) represents the switching power level for this charging session.

[0042] This embodiment achieves adaptive and intelligent charging phase management. It can dynamically optimize the charging strategy based on individual battery differences (such as increased internal resistance due to aging) and environmental changes (such as low temperature), ensuring that current switching occurs at the optimal time under any operating condition, thereby protecting the battery throughout its entire life cycle and achieving precise control "tailored to the power supply".

[0043] In a preferred embodiment of this application, step S1 described above has been optimized. Specifically, this embodiment provides a method for calculating the cutoff voltage. V cutoff The method takes into account the open-circuit voltage and temperature compensation under a specific SOC.

[0044] Calculate the cutoff voltage using the following formula. in: V cutoff —Lithium battery cutoff voltage, V; OCV a —The voltage value of a lithium battery when the battery SOC value is a, where a is between 90% and 100%, in V; T —Current temperature of the lithium battery, °C; T ref —Standard temperature, °C; β —Second temperature compensation coefficient, V / ℃, obtained through calibration.

[0045] The full charge voltage of a battery varies with temperature and individual differences. This formula uses the open-circuit voltage at a specific SOC value (e.g., 95%). OCV a Based on this, it is a relatively stable value. (Using the second temperature coefficient...) β Compensation is performed, for example, at low temperatures the actual battery voltage will be lower, and the formula is used... β×(T ref -T) The cutoff voltage is appropriately increased to avoid prematurely identifying the battery as fully charged; at high temperatures, the cutoff voltage is decreased to prevent overcharging. This cutoff voltage is calculated based on the cell's cutoff voltage; that is, when the cell's voltage reaches the cutoff voltage during charging, the charging operation for that cell can be stopped.

[0046] In actual use, the voltage value of the lithium battery is obtained when the battery SOC value is a. OCVa (For example, a=95%), current temperature of the lithium battery T Standard temperature T ref Second temperature compensation coefficient β Substituting the above parameters into the formula, the calculated lithium battery cutoff voltage is obtained. V cutoff The value is the cutoff voltage for this charging cycle.

[0047] This calculation method significantly improves the accuracy of full charge determination. Temperature compensation eliminates environmental interference with voltage detection, avoiding the risks of undercharging at low temperatures or overcharging at high temperatures. This is particularly important for battery packs composed of multiple cells connected in series, ensuring the consistency of the entire battery pack's state of charge and improving the overall system safety and energy efficiency.

[0048] This application also relates to a lithium battery charging system, including a parameter acquisition module, a data acquisition module, a first judgment module, a first execution module, a second execution module, a second judgment module, and a third execution module. The parameter acquisition module is used to acquire lithium battery parameters and calculate the switching capacity, a first charging current, a second charging current, and a cutoff voltage based on the lithium battery parameters. The data acquisition module is used to acquire the current SOC value and current voltage of the lithium battery in real time during lithium battery charging. The first judgment module is used to compare the current SOC value with the switching capacity. The first execution module charges at a constant first charging current when the current SOC value is less than the switching capacity. The second execution module charges at a constant second charging current when the current SOC value is not less than the switching capacity. The second judgment module is used to compare the current voltage of the lithium battery with the cutoff voltage. The third execution module is used to stop charging when the current voltage of the lithium battery is not less than the cutoff voltage. The first charging current is greater than the second charging current. The switching capacity is less than 100%. The cutoff voltage is less than the voltage when the lithium battery SOC value is 100%.

[0049] When the system is running: The parameter acquisition module starts up, reads battery parameters, and calculates the switching power. A First charging current I 1 Second charging current I 2 and cutoff voltage V cutoff ; The acquisition module works continuously, sending the acquired SOC and voltage data to subsequent modules; The first judgment module receives SOC data and switches the power level accordingly. A The comparison is performed, and based on the comparison result, the first execution module is triggered (to execute the first charging current). I 1 (charging) or the second execution module (executes the second charging current) I 2 Charge); During the operation of the second execution module, the second judgment module receives voltage data and compares it with the cutoff voltage. V cutoff The comparison shows that once the conditions are met, the third execution module is triggered to cut off the charging circuit.

[0050] This system employs a modular design, translating the methodology into concrete hardware entities, thereby enhancing system reliability and stability. The clearly defined modules facilitate system development, debugging, and maintenance. Furthermore, this architecture is well-suited for implementation in embedded systems and can be widely applied to various electronic products such as smartphones, electric vehicle BMS, and energy storage systems.

[0051] This application provides a lithium battery charging device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the lithium battery charging method in the above embodiments.

[0052] The following is for reference. Figure 2 This document illustrates a structural schematic diagram of a lithium battery charging device suitable for implementing embodiments of this application. The lithium battery charging device in these embodiments may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 2 The lithium battery charging device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of this application.

[0053] like Figure 2As shown, the lithium battery charging device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the lithium battery charging device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the lithium battery charging device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows lithium battery charging devices with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0054] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0055] The lithium battery charging device provided in this application, employing the lithium battery charging method described in the above embodiments, can solve the technical problems of lithium battery charging. Compared with the prior art, the beneficial effects of the lithium battery charging device provided in this application are the same as those of the lithium battery charging method provided in the above embodiments, and other technical features of the lithium battery charging device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0056] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0058] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the lithium battery charging method in the above embodiments.

[0059] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0060] The aforementioned computer-readable storage medium may be included in the lithium battery charging device; or it may exist independently and not assembled into the lithium battery charging device.

[0061] The aforementioned computer-readable storage medium carries one or more programs. When these programs are executed by the lithium battery charging device, the lithium battery charging device: when the vehicle is turning and braking, collects vehicle driving parameters, including steering wheel angle signal, brake pedal signal, steering wheel angle change rate, vehicle speed, road slope angle, and road surface adhesion coefficient; calculates the rear axle dynamic load and rear wheel lateral force of the vehicle when turning and in a braking request state based on the aforementioned parameters; calculates the upper limit of longitudinal braking force when the rear wheels of the vehicle remain stable on the current driving road without exceeding the adhesion limit, according to the aforementioned formula; when the rear axle friction braking is not engaged, if the current rear axle energy recovery braking force exceeds the upper limit of longitudinal braking force, the rear axle energy recovery braking force is reduced to not exceed the upper limit of longitudinal braking force, and then reduced to be equal to the upper limit of longitudinal braking force, while the front axle braking force is increased to keep the total vehicle braking force unchanged; if the upper limit of longitudinal braking force exceeds the current rear axle energy recovery braking force, the rear axle energy recovery braking force is increased to be equal to the upper limit of longitudinal braking force, and the front axle braking force is decreased to keep the total vehicle braking force unchanged.

[0062] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server.

[0063] In cases involving remote computers, the remote computer can be connected to the user's computer through any type of network—including a local area network (LAN) or a wide area network (WAN)—or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0064] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0065] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0066] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described lithium battery charging method, thereby solving the technical problem. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the lithium battery charging method provided in the above embodiments, and will not be repeated here.

[0067] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the lithium battery charging method described above.

[0068] The computer program product provided in this application can solve the technical problem. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the lithium battery charging method provided in the above embodiments, and will not be repeated here.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A method for charging a lithium battery, characterized in that: include, Obtain lithium battery parameters, and calculate the switching capacity, first charging current, second charging current, and cutoff voltage based on the lithium battery parameters; During lithium battery charging, the current SOC value and current voltage of the lithium battery are collected; If the current SOC value is less than the switching capacity, then charge at a constant first charging current until the current SOC value is not less than the switching capacity. If the current SOC value is not less than the switching capacity, then charge according to the constant second charging current until the current voltage of the lithium battery is not less than the cutoff voltage. If the current voltage of the lithium battery is not lower than the cutoff voltage, charging will stop. The first charging current is greater than the second charging current; the switching capacity is less than 100%; and the cutoff voltage is less than the voltage when the lithium battery's SOC value is 100%.

2. The lithium battery charging method as described in claim 1, characterized in that: The method for calculating the first charging current based on lithium battery parameters includes: calculating the first charging current according to the following formula. in: I 1 —First charging current; k 1 —The first coefficient is less than 1; C rated —Rated capacity of lithium battery; I max —Maximum allowable charging current for lithium batteries.

3. The lithium battery charging method as described in claim 2, characterized in that: The method for calculating the second charging current based on lithium battery parameters includes: calculating the second charging current according to the following formula. in: I 2 —Second charging current; k 2 —The second coefficient is less than k 1 ; C rated —Rated capacity of lithium battery.

4. A lithium battery charging method as described in claim 3, characterized in that: The method for calculating switching power based on lithium battery parameters includes: calculating the switching power according to the following formula. in: A — Switch power levels; R cell —Internal resistance of lithium battery; C rated —Rated capacity of lithium battery; V max —Maximum allowable charging voltage for lithium batteries; V min —Minimum operating voltage of lithium batteries; T —Current temperature of the lithium battery; T ref Standard temperature; α —First temperature compensation coefficient.

5. A lithium battery charging method as described in claim 4, characterized in that: The method for calculating the cutoff voltage based on lithium battery parameters includes: calculating the cutoff voltage according to the following formula. in: V cutoff —Lithium battery cutoff voltage; OCV a —The voltage value of a lithium battery when its SOC value is 'a', where 'a' is between 90% and 100%; T —Current temperature of the lithium battery; T ref Standard temperature; β —Second temperature compensation coefficient.

6. A lithium battery charging method as described in claim 5, characterized in that: The first coefficient is 0.9 to 0.98; the second coefficient is 0.2 to 0.

3.

7. A lithium battery charging system, characterized in that: The charging system charges the lithium battery according to any one of claims 1 to 6, including: The parameter acquisition module is used to acquire lithium battery parameters and calculate the switching capacity, first charging current, second charging current and cutoff voltage based on the lithium battery parameters. The acquisition module is used to acquire the current SOC value and current voltage of the lithium battery in real time during lithium battery charging. The first judgment module is used to compare the current SOC value with the switching power. The first execution module charges the battery with a constant first charging current when the current SOC value is less than the switching power. The second execution module charges the battery with a constant second charging current when the current SOC value is not less than the switching capacity. The second judgment module is used to compare the current voltage of the lithium battery with the cutoff voltage. The third execution module is used to stop charging when the current voltage of the lithium battery is not less than the cutoff voltage; The first charging current is greater than the second charging current; the switching capacity is less than 100%; and the cutoff voltage is less than the voltage when the lithium battery's SOC value is 100%.

8. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the lithium battery charging method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the lithium battery charging method as described in any one of claims 1 to 6.

10. A device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the lithium battery charging method as described in any one of claims 1 to 6.

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