Method and device for prolonging service life of battery cell, battery, system and electronic equipment

Abstract

The invention relates to a cell service life improving method and device, a battery, a system and electronic equipment. The method comprises the following steps: acquiring a charging and discharging stage of a target battery cell; wherein the target battery cell is prepared by adopting a positive electrode capacity overmatching scheme; and controlling charging and discharging of the target battery cell by adopting different charging and discharging strategies according to the charging and discharging stage of the target battery cell. By adopting the method, the service life of the battery cell can be prolonged, and the maintenance cost of the battery cell is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, device, battery, system and electronic device for improving the life of a battery cell. Background Art

[0002] With the rapid development and maturity of the energy storage market, the levelized cost of storage (LCOS) has gradually become a key indicator for measuring energy storage products in the industry. The cost of LCOS is proportional to the total life cycle cost investment and inversely proportional to the total life cycle throughput. This means that the longer the battery life, the higher the user's benefits. Therefore, long-life technology has a direct impact on user experience, and the development of ultra-long-life battery cell technology has become one of the current mainstream trends.

[0003] At present, the main way to achieve long battery life is through pre-lithiation technology, the most common of which are pre-lithiation technology and negative electrode pre-lithiation technology. Among them, pre-lithiation technology mainly adds some high-gram capacity and low-reversibility lithium supplements (mainstream metal oxides such as lithium nickel oxide and lithium iron oxide) on the side. Negative electrode pre-lithiation technology mainly combines metallic lithium with graphite negative electrode (lithium strip rolling or lithium powder coating) to achieve lithium supplementation.

[0004] However, the method of extending battery life through pre-lithiation technology has the problem of high cost. Summary of the invention

[0005] Based on this, it is necessary to provide a method, device, battery, system and electronic device for improving the life of a battery cell that can reduce costs in response to the above technical problems.

[0006] In a first aspect, the present application provides a method for improving the life of a battery cell, comprising:

[0007] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0008] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0009] In one embodiment, the above-mentioned adopting different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell includes:

[0010] When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0011] In one embodiment, the above-mentioned adopting different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell includes:

[0012] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0013] In one embodiment, the method further comprises:

[0014] When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

[0015] In one of the embodiments, the above-mentioned capacity over-matching scheme includes: the capacity over-matching scheme includes: the positive electrode preparation capacity of the target battery cell is determined by proportional over-matching of the positive electrode reference capacity; the negative electrode preparation capacity of the target battery cell is determined by discounting the negative electrode reference capacity; the total capacity of the target battery cell is determined based on the negative electrode preparation capacity.

[0016] In a second aspect, the present application also provides a battery cell life improvement device, comprising:

[0017] An acquisition module is used to acquire the charging and discharging stage of the target battery cell; wherein the target battery cell is prepared by using a capacity over-matching solution;

[0018] The control module is used to control the charging and discharging of the target battery cell by adopting different charging and discharging strategies according to the charging and discharging stage of the target battery cell.

[0019] On the third aspect, the present application also provides a battery, which is prepared using an over-matching scheme for the positive electrode capacity, and the charging and discharging strategy of the battery during use is determined according to the charging and discharging stage of the battery.

[0020] In one embodiment, the above-mentioned positive electrode capacity over-matching scheme includes: the positive electrode capacity of the battery is determined by proportional over-matching of the positive electrode base capacity; the negative electrode capacity of the battery is determined by discounting the negative electrode base capacity; and the total capacity of the battery is determined based on the negative electrode capacity.

[0021] In one embodiment, the above charging and discharging strategy includes:

[0022] When the battery is in the charging stage, a constant capacity charging strategy is used to charge the battery until the capacity of the battery reaches a preset capacity or the voltage of the battery reaches a cut-off voltage.

[0023] In one embodiment, the above charging and discharging strategy includes:

[0024] When the battery is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the battery until the battery is discharged to a preset voltage.

[0025] In a fourth aspect, the present application further provides a battery system, the battery system comprising a battery and a controller, the controller implementing the following steps:

[0026] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0027] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0028] In a fifth aspect, the present application further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0029] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0030] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0031] In a sixth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the following steps are implemented:

[0032] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0033] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0034] In a seventh aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0035] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0036] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0037] The above-mentioned method, device, battery, system and electronic device for improving the life of a battery cell first obtains the charging and discharging stage of the target battery cell; then, different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell; in this method, the target battery cell is prepared using a capacity over-matching scheme, which can provide more active lithium sources when preparing the target battery cell to delay the attenuation of the battery capacity. In addition, according to the charging and discharging stage of the target battery cell, different charging and discharging strategies are used to control the charging and discharging of the target battery cell, which can more effectively manage the charging and discharging process of the battery, reduce battery loss caused by excessive charging and discharging, and thus extend the battery life and reduce maintenance and replacement costs. Finally, by adjusting the charging and discharging strategy of the target battery cell, the status of the target battery cell can be grasped in real time to prevent and reduce the occurrence of failures, which reduces the maintenance frequency and related labor costs, thereby further reducing the total operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A diagram showing an application environment of a method for improving the life of a battery cell in one embodiment;

[0040] Figure 2 Schematic diagram of a process for improving the life of a battery cell in one embodiment;

[0041] Figure 3 A comparison diagram of cycle data in another embodiment;

[0042] Figure 4 is a structural block diagram of a battery cell life improvement device in one embodiment;

[0043] Figure 5 FIG. 4 is a diagram showing the internal structure of an electronic device in one embodiment. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] With the rapid development and increasing maturity of the energy storage market, LCOS cost has gradually become one of the key indicators for measuring energy storage products in the industry. LCOS cost is proportional to the total life cycle cost investment and inversely proportional to the total life cycle throughput. This means that the longer the battery life, the higher the user's benefits. Therefore, long-life technology will directly affect the user experience and return on investment.

[0046] In this context, the development of ultra-long-life battery cell technology has become one of the current mainstream technology trends. Ultra-long-life battery cell technology can not only extend the battery life cycle, but also significantly reduce overall operating costs. By reducing the frequency of battery replacement and maintenance costs, users can obtain higher economic benefits and more stable energy storage solutions.

[0047] In addition, ultra-long life battery cell technology has important application value in renewable energy storage systems, electric vehicles and other application scenarios that require high efficiency and high reliability. With the continuous advancement and innovation of technology, future energy storage products will not only pursue higher energy density and power density, but will also pay more attention to extending battery life and optimizing the full life cycle cost.

[0048] At present, the main method to achieve long battery life is through pre-lithiation technology. Common pre-lithiation technologies are divided into pre-lithiation technology and negative electrode pre-lithiation technology.

[0049] Pre-lithiation technology mainly involves adding some lithium supplements with high gram capacity but low reversibility, such as metal oxides such as lithium nickel oxide and lithium iron oxide. Although this method can effectively improve the life of the battery, the formation process needs to be adjusted during the manufacturing process, and these lithium supplements are expensive. In addition, a large amount of gas will be generated during the formation and subsequent application process, resulting in deterioration of battery performance.

[0050] The negative electrode pre-lithiation technology mainly achieves lithium replenishment by combining metallic lithium with graphite negative electrode. This can be done by lithium strip rolling or lithium powder coating. Although this method can effectively improve the life of the battery, due to the high activity of metallic lithium, it will react violently with moisture in the air, so the manufacturing process usually needs to be carried out in an ultra-low humidity environment with a dew point of -50°C. This not only increases the difficulty of manufacturing, but also poses a high risk of fire.

[0051] Although pre-lithiation technology has shown great potential in extending battery life, it also faces a series of challenges and technical difficulties. Pre-lithiation technology needs to overcome the high cost and gas production of lithium supplements, while negative electrode pre-lithiation technology needs to solve the strict requirements of the manufacturing environment and safety risks.

[0052] In view of the above problems, an embodiment of the present application provides a method for improving the life of a battery cell, aiming to solve the above problems.

[0053] The method for improving the life of a battery cell provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. In this environment, the battery 102 communicates with the controller 104 through a network. The data storage system can store the data that the controller 104 needs to process, and the data storage system can be integrated on the controller 104. The controller 104 first obtains the voltage of the battery 102, and adopts different charging and discharging strategies according to the voltage to control the charging and discharging process of the battery. In this way, the service life and performance of the battery can be effectively optimized. Among them, the battery 102 can be various types of lithium-ion batteries, nickel-metal hydride batteries, etc., suitable for a variety of application scenarios, such as electric vehicles, renewable energy storage systems, etc. The controller 104 can be a dedicated battery management system, or a module integrated in a larger system. The controller 104 can not only monitor and control the charging and discharging process of the battery, but also perform other related functions, such as temperature management, fault diagnosis, etc.

[0054] In an exemplary embodiment, Figure 2 As shown, a method for improving the life of a battery cell is provided, and the method is applied to Figure 1 The controller in is taken as an example to illustrate, including the following steps 201 to 202.

[0055] in:

[0056] Step 201, obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared using a capacity over-matching solution.

[0057] The target battery cell is prepared using a capacity over-matching solution, which means that during the battery design and manufacturing process, part of the battery is designed to have an actual capacity that exceeds the benchmark capacity. This design strategy aims to improve the overall energy density and cycle stability of the battery through increased energy storage capacity.

[0058] In the embodiment of the present application, first, the controller starts and performs a system self-check to ensure that it can work normally. Next, the controller connects and identifies the target battery cell to ensure that the target battery cell is in a normal working state. Then, the controller obtains the charge and discharge stage of the target battery cell.

[0059] Step 202 : Using different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0060] In the embodiment of the present application, during the data analysis phase, the controller analyzes the acquired charging and discharging phase of the target battery cell and selects an appropriate charging and discharging strategy, such as fast charging, slow charging, discharging or sleep mode, etc. According to the selected charging and discharging strategy, the controller adjusts the charging current and discharging current of the target battery cell.

[0061] It should be noted that during the charging process, the controller strictly monitors the voltage and current to reduce the occurrence of overcharging or over-discharging.

[0062] During the whole process, the controller monitors the voltage and other key parameters (such as temperature, current, etc.) of the target battery cell in real time. If the controller finds an abnormal situation (such as voltage is too high or too low), it will adjust the charge and discharge strategy in time. At the same time, the controller records the operating data of the target battery cell (including voltage, charge and discharge current, temperature, etc.), analyzes and archives these data for subsequent performance evaluation and optimization.

[0063] In the above-mentioned method for improving the life of a battery cell, the charging and discharging stage of the target battery cell is first obtained; then, different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell; in this method, the target battery cell is prepared using a capacity over-matching scheme, which can provide more active lithium sources when preparing the target battery cell to delay the attenuation of the battery capacity. In addition, according to the charging and discharging stage of the target battery cell, different charging and discharging strategies are used to control the charging and discharging of the target battery cell, which can more effectively manage the charging and discharging process of the battery, reduce battery loss caused by excessive charging and discharging, and thus extend the battery life and reduce maintenance and replacement costs. Finally, by adjusting the charging and discharging strategy of the target battery cell, the status of the target battery cell can be grasped in real time to prevent and reduce the occurrence of failures, which reduces the maintenance frequency and related labor costs, thereby further reducing the total operating cost.

[0064] In an exemplary embodiment, in step 202, “using different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell” includes:

[0065] When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0066] In the embodiment of the present application, when the target battery cell is in the charging stage, the controller adopts a constant capacity charging strategy to charge until the capacity of the battery cell reaches a preset value or the voltage reaches a cut-off voltage. Before charging begins, the controller first obtains the current state of the target battery cell, including parameters such as capacity, voltage, and temperature, so that charging is carried out under safe conditions. At the same time, the preset capacity and maximum cut-off voltage are set to clarify the charging target.

[0067] After the charging process enters the constant capacity charging mode, the controller will adjust the charging current to keep the target battery cell's added power per unit time constant. During this process, the controller will monitor the target battery cell's capacity and voltage in real time to ensure that the charging process is within a safe range and make dynamic adjustments based on real-time data.

[0068] The controller continuously checks whether the target cell has reached the preset capacity or cut-off voltage, and terminates charging based on whichever condition is met first. For example, if the voltage reaches the cut-off voltage but the capacity has not reached the preset capacity, the controller will immediately stop charging to avoid overvoltage damage to the target cell.

[0069] In the later stage of charging, as the voltage of the preset target cell gradually rises, the controller can also adjust the charging rate according to the actual situation and gradually reduce the charging current to extend the constant capacity charging stage. At the same time, temperature monitoring is also in progress. If the temperature of the target cell exceeds the safe range, the controller may take current limiting measures or suspend charging to ensure the safety of the target cell.

[0070] After charging is completed, the controller will send a stop charging signal and record relevant data of the charging process, including charging time, final voltage and charging capacity, for subsequent analysis and optimization.

[0071] In the above embodiments, the constant capacity charging strategy avoids overheating and internal structural damage of the battery cell caused by fast charging by strictly controlling the capacity growth during the charging process. The constant capacity input makes the electrochemical reaction of the target battery cell more stable, reduces the excessive stress of the active material, and thus prolongs the cycle life of the target battery cell. In addition, since the voltage gradually increases during the charging process, the dual cut-off condition (preset capacity or cut-off voltage) is adopted, so that the controller can terminate the charging in time before the voltage is too high, avoiding the safety problems caused by overcharging of the target battery cell, such as electrolyte decomposition, overheating or fire. Finally, the constant capacity charging strategy can quickly and efficiently charge a large amount of electricity by keeping the capacity input constant in the initial stage. When the battery cell capacity is close to the preset value or the voltage is close to the cut-off, the controller will automatically adjust the charging rate to optimize the charging process and avoid the voltage reaching the cut-off voltage too early, resulting in a decrease in charging efficiency.

[0072] In an exemplary embodiment, in step 202, “using different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell” includes:

[0073] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0074] In an embodiment of the present application, the controller obtains the current state of the target battery cell, including information such as capacity, voltage, temperature, and health status. During the discharge process, the controller will start the discharge according to the selected discharge strategy. If the constant power discharge strategy is selected, the controller will set a constant discharge power and adjust the current in real time to maintain a stable power output. Under this strategy, as the target battery cell voltage gradually decreases, the controller will adjust the discharge current accordingly to ensure that the power output remains unchanged. If the constant current discharge strategy is selected, the controller will set a constant discharge current and keep the current unchanged during the discharge process until the target battery cell voltage drops to a preset value. In this case, the discharge power will change with the change of voltage.

[0075] During the entire discharge process, the controller will monitor the voltage, capacity and temperature of the target battery in real time to ensure that it operates within a safe range. If the temperature of the target battery is detected to be abnormally high, the controller will take corresponding measures, such as reducing the discharge current or temporarily interrupting the discharge, to prevent the target battery from overheating and affecting its performance and safety. In addition, the controller will regularly check the health status of the target battery to ensure that the discharge process does not have a negative impact on the long-term life of the target battery.

[0076] When the voltage of the target cell reaches the preset value, the controller will send a stop discharge signal to terminate the discharge process. At this time, the controller will record relevant data during the discharge process, including discharge duration, final voltage, and discharge capacity, etc., to provide a basis for subsequent analysis and optimization. Finally, after the discharge is completed, the controller will check the cell status to confirm whether the target cell is in a stable state.

[0077] In the above embodiments, the constant power or constant current discharge strategy is adopted to reduce the excessive pressure on the target battery cell in the case of over-discharge or excessive current, reduce the stress and loss of internal materials, and thus extend the service life of the target battery cell. In the constant power discharge mode, the current of the target battery cell gradually increases as the voltage decreases, but the controller adjusts to ensure that the power output does not increase excessively, thereby reducing the rapid aging of the target battery cell due to high current load. In the constant current discharge mode, the constant current can prevent sudden large current shocks and reduce damage to the target battery cell structure.

[0078] In an exemplary embodiment, the method further includes:

[0079] When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

[0080] Among them, the preset state of health (SOH) is a key indicator used to describe the health status of the battery. SOH is usually expressed as a percentage, reflecting the performance and capacity of the battery in its current state relative to a new battery. The SOH of a new, well-performing battery is 100%, and as the battery is used for an increasing amount of time and the number of charge and discharge cycles increases, the SOH of the battery will gradually decrease. For example, if the rated capacity of the battery is 100Ah and the current actual capacity is 80Ah, then the SOH is 80%.

[0081] The prompt information may include:

[0082] (1) Status health value reaches preset value prompt: Display or record the current status health value of the target battery cell so as to understand the health status of the target battery cell in a timely manner.

[0083] (2) Recommended treatment measures: Based on the preset status health value, recommended treatment measures can be provided, for example, whether to continue using the battery, perform maintenance, reuse it, or recycle it.

[0084] (3) Alarm or notification: If the degradation of the health value means that the target cell may no longer be able to support its current application requirements, the controller can trigger an alarm or send a notification so that appropriate measures can be taken in a timely manner.

[0085] In an embodiment of the present application, when the capacity of the target battery cell decays to a preset state health value, the controller may notify the execution of related operations or processing by outputting prompt information.

[0086] In some embodiments, when the state health value of the target battery cell decays to a preset state health value, the target battery cell is usually considered to be reused or otherwise processed.

[0087] (1) Secondary use: The target battery cells that have decayed to a preset health value can be reused in other energy storage systems, low-power devices, or other application scenarios through certain processing and repair technologies. For example, they can be used as auxiliary power sources in low-power applications or energy storage systems to extend their service life and maximize their value.

[0088] (2) Recycling and remanufacturing: The target battery cells can enter the recycling process and be reused or remanufactured into new battery components by recovering their materials (such as nickel, cobalt, lithium, etc.).

[0089] In the above embodiment, when the capacity of the target battery cell decays to a preset health status value, the controller can promptly remind the user or system administrator that the target battery cell is approaching the critical point of its service life by outputting a prompt message. This can prevent the target battery cell from excessively decaying during continued use, resulting in a significant drop in performance or potential safety hazards. Through this function, measures can be taken in advance, such as replacing the battery cell or adjusting the usage strategy, to prevent unexpected failures or safety accidents caused by excessive use.

[0090] In an exemplary embodiment, the above-mentioned positive electrode capacity over-matching scheme includes: the preparation capacity of the target battery cell is determined by proportional over-matching of the benchmark capacity; the negative electrode preparation capacity of the target battery cell is determined by discounting the negative electrode benchmark capacity; the total capacity of the target battery cell is determined based on the negative electrode preparation capacity.

[0091] In the embodiment of the present application, the preparation capacity of the target battery cell is determined by over-proportioning the benchmark capacity; the negative electrode preparation capacity of the target battery cell is determined by discounting the negative electrode benchmark capacity; and the total capacity of the target battery cell is determined based on the negative electrode preparation capacity.

[0092] In this design, the target cell capacity is larger than the reference capacity, which is usually achieved by increasing the amount of material, which is called capacity over-proportioning. The negative electrode capacity is achieved by reducing the amount of negative electrode material, which is called negative electrode capacity discounting. Ultimately, the total capacity of the target cell depends mainly on the negative electrode capacity.

[0093] In some embodiments, the total capacity design process of the target battery cell is based on the negative electrode preparation capacity, and the gram capacity A1 used for capacity design is determined by the negative electrode lithium insertion degree, the actual gram capacity of the negative electrode is A0, and the negative electrode lithium insertion degree is set to d (d = 1 / NP ratio, NP ratio defines the capacity ratio of the negative electrode to the deintercalated lithium per unit area), where A1 = A0*d;

[0094] Capacity over-matching design, where the over-matching ratio is R (R ranges from 0% to 30%), the actual gram capacity is C0, the mass of active material per unit area of ​​the negative electrode is Ma, and the mass of active material per unit area Mc = A1*Ma / (C0 / (1+R)).

[0095] The above embodiments can optimize the performance and life of the battery cell. For example, under the constant capacity cyclic charge and discharge strategy, the controller will limit the capacity of each charge and discharge cycle to maintain the stability of the battery. As the cycle progresses, the over-capacity can provide additional lithium sources, thereby delaying capacity decay. Finally, when the voltage reaches the preset threshold, it switches to a constant power cyclic charge and discharge strategy, so that the target battery cell operates within a safe range and extends the service life of the target battery cell.

[0096] According to some embodiments of the present application, a method for improving the life of a battery cell is provided. Figure 1 Taking the controller 104 in FIG. 1 as an example, the following steps may be included:

[0097] Step 1, obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by adopting the positive electrode capacity over-matching scheme; the positive electrode capacity over-matching scheme includes: the preparation capacity of the target battery cell is determined by proportional over-matching of the benchmark capacity; the negative electrode preparation capacity of the target battery cell is determined by discounting the negative electrode benchmark capacity; the total capacity of the target battery cell is determined based on the negative electrode preparation capacity.

[0098] Step 2: When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0099] Step 3: When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is used to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0100] Step 4: When the capacity of the target battery cell decays to a preset state health value, output a prompt message.

[0101] like Figure 3 As shown, in Figure 3 In the figure, the horizontal axis represents the number of cycles; the vertical axis represents the capacity retention rate. The following uses Comparative Example 1 and Example 1 to illustrate the effect of the method for improving the life of the battery cell in the present application:

[0102] Comparative Example 1:

[0103] LFP: discharge capacity 144mAh / g, loading 97%, CW 0.185mg / mm2;

[0104] Graphite anode: discharge capacity 345mAh / g, anode loading 96%, CW 0.089mg / mm2; discharge NP ratio 1.13, battery first efficiency 90.1%, battery capacity 2Ah

[0105] Charge and discharge strategy: 25℃ 1P constant power charge and discharge, charge and discharge voltage window 2.5-3.65V.

[0106] Using 25℃, 1P (1P means the charge and discharge rate is 1C) cycle:

[0107] 1. Place at (25±2)℃ for 30 minutes;

[0108] 2. Discharge to 2.5V at a rate of 0.5C;

[0109] 3. Let stand for 10 minutes;

[0110] 4. Charge to 3.65V at 1C rate;

[0111] 5. Let stand for 10 minutes;

[0112] 6. Discharge to 2.5V at 1C rate;

[0113] 7. Repeat steps 3-6 and cycle the test until the capacity decays to 70% of the initial capacity;

[0114] 8. Let stand for 10 minutes;

[0115] 9. Charge at 0.5C rate for 36 minutes;

[0116] 10. Let stand for 10 minutes;

[0117] 11. End.

[0118] Embodiment 1:

[0119] Graphite negative electrode: actual discharge capacity 345mAh / g, design capacity 345 / 1.13 = 305mAh / g, negative electrode loading 96%, CW 0.089mg / mm2;

[0120] LFP: discharge capacity 144 mAh / g, loading 97%, CW = 305*0.089 / (144 / (1+5%) = 0.198 mg / mm2;

[0121] Charging NP ratio 1.13, over-allocation 5%, battery capacity 2Ah

[0122] Charge and discharge strategy: 25℃ 1P constant power charge and discharge, charge and discharge voltage upper and lower limit window 2.5-3.65V.

[0123] Using 25℃, 1P cycle:

[0124] 1. Place at (25±2)℃ for 30 minutes;

[0125] 2. Discharge to 2.5V at 0.5P;

[0126] 3. Let stand for 10 minutes;

[0127] 4. Charge to 2Ah at 1P;

[0128] 5. Let stand for 10 minutes;

[0129] 6. Discharge to 2.5V at 1P;

[0130] 7. Repeat steps 3-6 and cycle the test until the charging upper limit voltage reaches 3.65V;

[0131] 8. Let stand for 10 minutes;

[0132] 9. Charge to 3.65V at 1P;

[0133] 10. Let stand for 10 minutes;

[0134] 11. Discharge to 2.5V at 1P;

[0135] 12. Repeat steps 8-11 and cycle the test until the capacity decays to 70% SOH;

[0136] 13. Let stand for 10 minutes;

[0137] 14. Charge at 0.5P for 36 minutes;

[0138] 15. Let stand for 10 minutes;

[0139] 16. End.

[0140] In the above embodiment, the charging and discharging stage of the target battery cell is first obtained; then, different charging and discharging strategies are adopted to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell; in this method, the target battery cell is prepared by a capacity over-matching scheme, which can provide more active lithium sources when preparing the target battery cell to delay the attenuation of the battery capacity. In addition, according to the charging and discharging stage of the target battery cell, different charging and discharging strategies are adopted to control the charging and discharging of the target battery cell, which can more effectively manage the charging and discharging process of the battery, reduce battery loss caused by excessive charging and discharging, and thus extend the battery life and reduce maintenance and replacement costs. Finally, by adjusting the charging and discharging strategy of the target battery cell, the status of the target battery cell can be grasped in real time to prevent and reduce the occurrence of faults, which reduces the maintenance frequency and related labor costs, thereby further reducing the total operating cost.

[0141] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0142] Based on the same inventive concept, the embodiment of the present application also provides a battery cell life improvement device for implementing the battery cell life improvement method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more embodiments of the battery cell life improvement device provided below can refer to the limitations of the battery cell life improvement method above, and will not be repeated here.

[0143] In an exemplary embodiment, Figure 4 As shown, a battery cell life improvement device is provided, including: an acquisition module 401 and a control module 402, wherein:

[0144] The acquisition module 401 is used to acquire the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a capacity over-matching solution;

[0145] The control module 402 is used to control the charging and discharging of the target battery cell by adopting different charging and discharging strategies according to the charging and discharging stage of the target battery cell.

[0146] In some embodiments, the control module 402 is specifically used to charge the target battery cell using a constant capacity charging strategy when the target battery cell is in a charging stage, until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0147] In some embodiments, the control module 402 is further specifically configured to discharge the target battery cell using a constant power discharge strategy or a constant current discharge strategy when the target battery cell is in a discharge stage, until the target battery cell is discharged to a preset voltage.

[0148] In some embodiments, the above apparatus may further include:

[0149] The information output module is used to output prompt information when the capacity of the target battery cell decays to a preset state health value.

[0150] Each module in the above-mentioned battery cell life improvement device can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0151] In an exemplary embodiment, a battery is provided. The battery is prepared using a positive electrode capacity over-matching scheme, and the charge and discharge strategy of the battery during use is determined according to the charge and discharge stage of the battery.

[0152] The target battery cell is prepared using a capacity over-matching solution, which means that during the battery design and manufacturing process, part of the battery is designed to have an actual capacity that exceeds the benchmark capacity. This design strategy aims to improve the overall energy density and cycle stability of the battery through increased energy storage capacity.

[0153] First, the controller starts and performs a system self-check to ensure that it can work properly. Next, the controller connects and identifies the target battery cell to ensure that the target battery cell is in a normal working state. Then, the controller obtains the charge and discharge stage of the target battery cell.

[0154] In the data analysis phase, the controller analyzes the acquired charging and discharging stage of the target battery cell and selects an appropriate charging and discharging strategy, such as fast charging, slow charging, discharging or sleep mode. Based on the selected charging and discharging strategy, the controller adjusts the charging current and discharging current of the target battery cell.

[0155] It should be noted that during the charging process, the controller strictly monitors the voltage and current to reduce the occurrence of overcharging or over-discharging.

[0156] During the whole process, the controller monitors the voltage and other key parameters (such as temperature, current, etc.) of the target battery cell in real time. If the controller finds an abnormal situation (such as voltage is too high or too low), it will adjust the charge and discharge strategy in time. At the same time, the controller records the operating data of the target battery cell (including voltage, charge and discharge current, temperature, etc.), analyzes and archives these data for subsequent performance evaluation and optimization.

[0157] First, the charge and discharge stage of the target battery cell is obtained; then, different charge and discharge strategies are used to control the charge and discharge of the target battery cell according to the charge and discharge stage of the target battery cell; in this method, the target battery cell is prepared by a capacity over-matching scheme, which can provide more active lithium sources when preparing the target battery cell to delay the attenuation of the battery capacity. In addition, according to the charge and discharge stage of the target battery cell, different charge and discharge strategies are used to control the charge and discharge of the target battery cell, which can more effectively manage the charge and discharge process of the battery, reduce battery loss caused by excessive charge and discharge, and thus extend the battery life and reduce maintenance and replacement costs. Finally, by adjusting the charge and discharge strategy of the target battery cell, the status of the target battery cell can be grasped in real time to prevent and reduce the occurrence of failures, which reduces the maintenance frequency and related labor costs, thereby further reducing the total operating cost.

[0158] In an exemplary embodiment, the positive electrode capacity over-matching scheme includes: the positive electrode preparation capacity of the target battery cell is determined by proportional over-matching of the positive electrode reference capacity; the negative electrode preparation capacity of the target battery cell is determined by discounting the negative electrode reference capacity; the total capacity of the target battery cell is determined based on the negative electrode preparation capacity.

[0159] The target cell capacity is larger than the reference capacity, which is usually achieved by increasing the amount of material, which is called capacity over-proportioning. The negative electrode capacity is achieved by reducing the amount of negative electrode material, which is called negative electrode capacity discounting. Ultimately, the total capacity of the target cell mainly depends on the negative electrode capacity.

[0160] The use of a capacity over-allocation solution can optimize the performance and life of the battery cell. For example, under the constant capacity cyclic charge and discharge strategy, the controller limits the capacity of each charge and discharge cycle to maintain the stability of the battery. As the cycle progresses, the over-allocation capacity can provide additional lithium sources, thereby delaying capacity decay. Finally, when the voltage reaches the preset threshold, it switches to a constant power cyclic charge and discharge strategy, allowing the target battery cell to operate within a safe range and extend the service life of the target battery cell.

[0161] In an exemplary embodiment, the charge and discharge strategy includes: when the target battery cell is in a charging stage, charging the target battery cell using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0162] When the target cell is in the charging stage, the controller uses a constant capacity charging strategy to charge until the cell capacity reaches the preset value or the voltage reaches the cut-off voltage. Before charging begins, the controller first obtains the current state of the target cell, including parameters such as capacity, voltage, and temperature, so that charging can be carried out under safe conditions. At the same time, the preset capacity and maximum cut-off voltage are set to clarify the charging target.

[0163] After the charging process enters the constant capacity charging mode, the controller will adjust the charging current to keep the target battery cell's added power per unit time constant. During this process, the controller will monitor the target battery cell's capacity and voltage in real time to ensure that the charging process is within a safe range and make dynamic adjustments based on real-time data.

[0164] The controller continuously checks whether the target cell has reached the preset capacity or cut-off voltage, and terminates charging based on whichever condition is met first. For example, if the voltage reaches the cut-off voltage but the capacity has not reached the preset capacity, the controller will immediately stop charging to avoid overvoltage damage to the target cell.

[0165] In the later stage of charging, as the voltage of the preset target cell gradually rises, the controller can also adjust the charging rate according to the actual situation and gradually reduce the charging current to extend the constant capacity charging stage. At the same time, temperature monitoring is also in progress. If the temperature of the target cell exceeds the safe range, the controller may take current limiting measures or suspend charging to ensure the safety of the target cell.

[0166] After charging is completed, the controller will send a stop charging signal and record relevant data of the charging process, including charging time, final voltage and charging capacity, for subsequent analysis and optimization.

[0167] The constant capacity charging strategy avoids overheating and internal structural damage of the battery cell caused by fast charging by strictly controlling the capacity growth during the charging process. The constant capacity input makes the electrochemical reaction of the target battery cell more stable, reduces the excessive stress of the active material, and thus prolongs the cycle life of the target battery cell. In addition, since the voltage gradually increases during the charging process, the use of dual cut-off conditions (preset capacity or cut-off voltage) allows the controller to terminate the charging in time before the voltage is too high, avoiding safety problems caused by overcharging of the target battery cell, such as electrolyte decomposition, overheating or fire. Finally, the constant capacity charging strategy can quickly and efficiently charge a large amount of electricity by keeping the capacity input constant in the initial stage. When the battery cell capacity is close to the preset value or the voltage is close to the cut-off, the controller will automatically adjust the charging rate to optimize the charging process and avoid the voltage reaching the cut-off voltage too early, resulting in a decrease in charging efficiency.

[0168] In an exemplary embodiment, the charge and discharge strategy includes:

[0169] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0170] The controller obtains the current state of the target cell, including information such as capacity, voltage, temperature, and health status. During the discharge process, the controller will start the discharge according to the selected discharge strategy. If the constant power discharge strategy is selected, the controller will set a constant discharge power and adjust the current in real time to maintain a stable power output. Under this strategy, as the target cell voltage gradually decreases, the controller will adjust the discharge current accordingly to ensure that the power output remains unchanged. If the constant current discharge strategy is selected, the controller will set a constant discharge current and keep the current unchanged during the discharge process until the target cell voltage drops to the preset value. In this case, the discharge power will change with the change of voltage.

[0171] During the entire discharge process, the controller will monitor the voltage, capacity and temperature of the target battery in real time to ensure that it operates within a safe range. If the temperature of the target battery is detected to be abnormally high, the controller will take corresponding measures, such as reducing the discharge current or temporarily interrupting the discharge, to prevent the target battery from overheating and affecting its performance and safety. In addition, the controller will regularly check the health status of the target battery to ensure that the discharge process does not have a negative impact on the long-term life of the target battery.

[0172] When the voltage of the target cell reaches the preset value, the controller will send a stop discharge signal to terminate the discharge process. At this time, the controller will record relevant data during the discharge process, including discharge duration, final voltage, and discharge capacity, etc., to provide a basis for subsequent analysis and optimization. Finally, after the discharge is completed, the controller will check the cell status to confirm whether the target cell is in a stable state.

[0173] Adopting a constant power or constant current discharge strategy can reduce the excessive pressure on the target battery cell in the case of over-discharge or excessive current, reduce the stress and loss of internal materials, and thus extend the service life of the target battery cell. In the constant power discharge mode, the current of the target battery cell gradually increases as the voltage decreases, but the controller adjusts to ensure that the power output does not increase excessively, thereby reducing the rapid aging of the target battery cell due to high current load. In the constant current discharge mode, the constant current can prevent sudden large current shocks and reduce damage to the target battery cell structure.

[0174] In an exemplary embodiment, a battery system is provided, the battery system comprising a battery and a controller; the controller performs the following steps:

[0175] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0176] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0177] In one embodiment, the controller further performs the following steps:

[0178] When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0179] In one embodiment, the controller further performs the following steps:

[0180] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0181] In one embodiment, the controller further performs the following steps:

[0182] When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

[0183] In an exemplary embodiment, an electronic device is provided. The electronic device may be a server, and its internal structure diagram may be as shown in FIG. Figure 5As shown. The electronic device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data in the process of improving the life of the battery cell. The input / output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for improving the life of the battery cell is implemented.

[0184] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0185] In an exemplary embodiment, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0186] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0187] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0188] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0189] When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0190] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0191] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0192] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0193] When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

[0194] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0195] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0196] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0197] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0198] When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0199] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0200] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0201] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0202] When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

[0203] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0204] Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution;

[0205] Different charging and discharging strategies are used to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

[0206] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0207] When the target battery cell is in the charging stage, the target battery cell is charged using a constant capacity charging strategy until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

[0208] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0209] When the target battery cell is in the discharge stage, a constant power discharge strategy or a constant current discharge strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

[0210] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0211] When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

[0212] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0213] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0214] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for improving the life of a battery cell, characterized in that: The method comprises: Obtaining the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a positive electrode capacity over-matching solution; Different charging and discharging strategies are adopted to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell.

2. The method according to claim 1, characterized in that: The adopting different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell comprises: When the target battery cell is in a charging stage, a constant capacity charging strategy is adopted to charge the target battery cell until the capacity of the target battery cell reaches a preset capacity or the voltage of the target battery cell reaches a cut-off voltage.

3. The method according to claim 1, characterized in that The adopting different charging and discharging strategies to control the charging and discharging of the target battery cell according to the charging and discharging stage of the target battery cell comprises: When the target battery cell is in a discharging stage, a constant power discharging strategy or a constant current discharging strategy is adopted to discharge the target battery cell until the target battery cell is discharged to a preset voltage.

4. The method according to claim 2, characterized in that: The method further comprises: When the capacity of the target battery cell decays to a preset state health value, a prompt message is output.

5. The method according to any one of claims 1 to 4, characterized in that: The positive electrode capacity over-matching scheme includes: the positive electrode preparation capacity of the target battery cell is determined by proportional over-matching of the positive electrode reference capacity; the negative electrode preparation capacity of the target battery cell is determined by discounting the negative electrode reference capacity; the total capacity of the target battery cell is determined based on the negative electrode preparation capacity.

6. A battery cell life improvement device, characterized in that: The device comprises: An acquisition module is used to acquire the charge and discharge stage of the target battery cell; wherein the target battery cell is prepared by using a capacity over-matching solution; The control module is used to control the charging and discharging of the target battery cell by adopting different charging and discharging strategies according to the charging and discharging stage of the target battery cell.

7. A battery, characterized in that: The battery is prepared by adopting a positive electrode capacity over-matching scheme, and the charge and discharge strategy of the battery during use is determined according to the charge and discharge stage of the battery.

8. The battery according to claim 7, characterized in that The positive electrode capacity over-matching scheme includes: the positive electrode capacity of the battery is determined by proportional over-matching of the positive electrode base capacity; the negative electrode capacity of the battery is determined by discounting the negative electrode base capacity; and the total capacity of the battery is determined based on the negative electrode capacity.

9. The battery according to claim 7, characterized in that The charging and discharging strategy includes: When the battery is in the charging stage, a constant capacity charging strategy is adopted to charge the battery until the capacity of the battery reaches a preset capacity or the voltage of the battery reaches a cut-off voltage.

10. The battery according to claim 7, characterized in that The charging and discharging strategy includes: When the battery is in a discharging stage, a constant power discharging strategy or a constant current discharging strategy is adopted to discharge the battery until the battery is discharged to a preset voltage.

11. A battery system, characterized in that: The battery system comprises a controller and a battery as claimed in any one of claims 7 to 10; The controller is used to execute the method according to any one of claims 1 to 5.

12. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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