Charging and discharging control method for improving cycle performance of battery, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a charge-discharge control method for improving the cycle performance of a battery, electronic equipment and a storage medium. The charge-discharge control method comprises the following steps: acquiring the current charge state of a target battery; when the target battery is charged from the current state of charge to a next preset state of charge, charging the target battery based on the preset state of charge until the target battery is charged to a cut-off voltage; and discharging the target battery which is charged to the cut-off voltage until the state of charge of the target battery is 0%, and standing the target battery in a first duration, so that the cycle performance of the lithium battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technologies, and particularly to a charge and discharge control method, an electronic device, and a storage medium for improving the cycle performance of a battery. Background Art

[0002] Lithium-ion batteries with different cathode main materials have different cycle performances. For ternary lithium-ion batteries: the cycle life is generally about 1000 - 2000 times. Factors affecting the cycle performance: temperature, charge and discharge depth, charge and discharge mode, etc. will all affect its cycle life. Advantages and disadvantages: high energy density, fast charging speed, good low-temperature performance, but high cost and poor high-temperature performance. For lithium iron phosphate batteries: the cycle life is generally about 2000 - 3000 times. Factors affecting the cycle performance: temperature, charge and discharge depth, charge and discharge mode, etc. will all affect its cycle life. Advantages and disadvantages: low cost, good safety performance, long cycle life, but low energy density and slow charging speed. For lithium cobalt oxide batteries: the cycle life is generally about 300 - 500 times. Advantages and disadvantages: stable structure, high capacity ratio, outstanding comprehensive performance, but poor safety, very high cost, and limited reserves of cobalt resources.

[0003] There are many methods to improve the cycle performance of lithium-ion batteries. For example, optimizing the positive and negative electrode materials. The positive and negative electrode main materials directly determine the cycle performance of lithium-ion batteries. By optimizing the doping in the material system and developing single-crystal materials, etc., the cycle life of lithium-ion batteries can be improved, but it will increase the manufacturing cost of lithium-ion batteries, and at the same time, the material development cycle will be relatively long. For example, optimizing the electrolyte formula. The electrolyte can be vividly compared to the blood of a lithium-ion battery. As an important channel for lithium-ion transmission, by optimizing the electrolyte formula, the ionic conductivity can be increased, enabling lithium ions to be quickly transmitted between the positive and negative electrodes. However, there are also problems such as a long cycle and increased cost in optimizing the electrolyte formula. For example, improving the charge and discharge mode. The normal charge and discharge is carried out within the range of 0 - 100% SOC (SOC: SOC is the state of charge of the battery, indicating the percentage of the current remaining battery capacity in the total battery capacity. Discharge rate C: The discharge rate C is an index to measure the charge and discharge speed of the battery, indicating the magnitude of the current required to charge or discharge the rated capacity within a specified time. The calculation formula of the discharge rate C is: charge and discharge rate C = charge and discharge current / rated capacity). Shallow charge and discharge is carried out within the range of 20% - 80% SOC. Avoiding deep charge and discharge of lithium-ion batteries can, to a certain extent, extend the cycle life, but shallow charge and discharge cannot fully exert the true value of lithium-ion batteries, which will lead to the problem of insufficient battery life and thus reduce the user experience. Summary of the Invention

[0004] Embodiments of the present application provide a charge and discharge control method, an electronic device, and a storage medium for improving the cycle performance of a battery, which can improve the cycle performance of lithium-ion batteries.

[0005] An embodiment of the present application provides a charge-discharge control method for improving the battery cycle performance, including:

[0006] Obtain the current state of charge of the target battery;

[0007] When the target battery is charged from the current state of charge to the next preset state of charge, charge the target battery based on the preset state of charge until the target battery is charged to the cut-off voltage;

[0008] Discharge the target battery charged to the cut-off voltage until the state of charge of the target battery is 0%, and then let the target battery stand for the first time period.

[0009] Optionally, in some embodiments of the present application, the step of when the target battery is charged from the current state of charge to the preset state of charge, charging the target battery based on the preset charge value until the target battery is charged to the cut-off voltage includes:

[0010] Determine the initial charging current corresponding to the state of charge;

[0011] Charge the target battery with a constant current based on the initial charging current;

[0012] When the target battery is charged from the current state of charge to the preset state of charge, obtain the first preset charging current corresponding to the preset charge value;

[0013] Charge the target battery based on the first preset charging current until the target battery is charged to the cut-off voltage.

[0014] Optionally, in some embodiments of the present application, the step of charging the target battery based on the first preset charging current until the target battery is charged to the cut-off voltage includes:

[0015] Set the first preset charging current as the target charging current;

[0016] Charge the target battery based on the target charging current;

[0017] When the target battery is charged from the current preset charge value to the next preset state of charge, determine the charging current corresponding to the next preset state of charge as the target charging current, and return to execute the step of charging the target battery based on the target charging current until the target battery is charged to the first state of charge;

[0018] When charging to the first state of charge, charge the target battery to the second state of charge with the second preset charging current;

[0019] When charging to the second state of charge, the target battery is charged to the cut-off voltage by a third pre-charge current.

[0020] Optionally, in some embodiments of the present application, the preset state of charge includes a first preset state-of-charge value, a second preset state-of-charge value, a third preset state-of-charge value, a fourth preset state-of-charge value, a fifth preset state-of-charge value, and a sixth preset state-of-charge value;

[0021] The range of the first preset state-of-charge value is 5% - 20%; the range of the second preset state-of-charge value is 10% - 50%; the range of the third preset state-of-charge value is 40% - 70%; the range of the fourth preset state-of-charge value is 50% - 80%; the range of the first preset state-of-charge value is 70% - 95%.

[0022] Optionally, in some embodiments of the present application, the charging rate corresponding to the first charging current is 0.5C - 5C, the charging rate corresponding to the second preset charging current is 0.01C - 5C, and the charging rate corresponding to the third charging current is 0.3C - 2C.

[0023] Optionally, in some embodiments of the present application, the first preset charging current includes a first charging current value, a second charging current value, a third charging current value, a fourth charging current value, a fifth charging current value, and a sixth charging current value;

[0024] Wherein, the charging rates of the first charging current value, the second charging current value, the third charging current value, the fourth charging current value, the fifth charging current value, and the sixth charging current value increase in sequence, or;

[0025] The charging rates of the first charging current value, the second charging current value, the third charging current value, the fourth charging current value, the fifth charging current value, and the sixth charging current value decrease in sequence.

[0026] Optionally, in some embodiments of the present application, after charging to the second state of charge and charging the target battery to the cut-off voltage by a third pre-charge current, it further includes:

[0027] Let the target battery charged to the cut-off voltage stand for a second duration.

[0028] Optionally, in some embodiments of the present application, the range of the first duration is 10 min - 120 min; the range of the second duration is 10 min - 120 min.

[0029] Correspondingly, the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor executes the program, it performs the steps of any of the above methods.

[0030] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0031] The embodiment of the present application provides a charge and discharge control method, electronic device and storage medium for improving the cycle performance of a battery. After obtaining the current state of charge of a target battery, when the target battery is charged from the current state of charge to the next preset state of charge, the target battery is charged based on the preset state of charge until the target battery is charged to a cut-off voltage. Finally, the target battery charged to the cut-off voltage is discharged until the state of charge of the target battery is 0%, and the target battery is left to stand for a first time. The charge and discharge control scheme for improving the cycle performance of a battery provided by the present application, the target battery is charged from the current state of charge to the next preset state of charge, the target battery is charged based on the preset state of charge until the target battery is charged to a cut-off voltage, and then, the target battery charged to the cut-off voltage is discharged until the state of charge of the target battery is 0%, thereby achieving deep charge and discharge of the target battery, improving the battery life of the target battery, and improving the cycle performance of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a flow chart of a charge and discharge control method for improving battery cycle performance provided in an embodiment of the present application;

[0034] Figure 2 is a 45°C cycle capacity retention curve provided in the examples of the present application;

[0035] Figure 3 is a 25°C cycle capacity retention curve provided in the examples of the present application;

[0036] Figure 4 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0038] An embodiment of the present application provides a charge and discharge control method, device, electronic device, and storage medium for improving the cycle performance of a battery.

[0039] Among them, the charge and discharge control method for improving the cycle performance of the battery can be specifically applied to a terminal. The terminal may include a tablet computer or a personal computer (PC, Personal Computer). The terminal can establish a wired or wireless connection with a server. The server may include an independent running server or a distributed server, or may also include a server cluster composed of multiple servers.

[0040] The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0041] A charge and discharge control method for improving the cycle performance of a battery includes: obtaining the current state of charge of a target battery; when the target battery is charged from the current state of charge to the next preset state of charge, charging the target battery based on the preset state of charge until the target battery is charged to the cut-off voltage; discharging the target battery charged to the cut-off voltage until the state of charge of the target battery is 0%, and then standing the target battery for a first period of time.

[0042] Please refer to Figure 1 , Figure 1 which is a schematic flowchart of the charge and discharge control method for improving the cycle performance of the battery provided by the embodiment of the present application. The specific process of the charge and discharge control method for improving the cycle performance of the battery can be as follows:

[0043] 101. Obtain the current state of charge of the target battery.

[0044] The target battery refers to a lithium battery whose cycle performance needs to be improved through a specific charge and discharge strategy. The current state of charge of the target battery refers to the percentage of the remaining power of the target battery at a certain moment in its rated capacity. For example, the current state of charge of the target battery can be estimated by measuring the open-circuit voltage of the battery, or by measuring the current during the charge and discharge process of the battery and integrating the current; it can also combine the battery model and measurement data to estimate the current state of charge of the target battery through a recursive algorithm, and specific selection can be made according to the actual situation, which is not limited here.

[0045] 102. When the target battery is charged from the current state of charge (SOC) to the next preset SOC, charge the target battery based on the preset SOC until the target battery is charged to the cut-off voltage.

[0046] The preset SOC refers to the SOC interval set during the charging process.

[0047] Within each preset SOC interval, according to the preset charging strategy (usually constant current charging), select a suitable charging current to charge the battery.

[0048] For example: from 20% to 30% SOC, charge with 1C; from 30% to 50% SOC, charge with 2C. When the SOC of the battery approaches 100%, the charging voltage will gradually approach the cut-off voltage of the battery (e.g., 3.65V). The charging process ends when the battery voltage reaches the cut-off voltage and the charging current drops to the set cut-off current (such as 0.1C).

[0049] In the embodiments of the present application, a multi-stage charging strategy is adopted, and different charging currents are used in different SOC intervals to improve the charging efficiency and battery life.

[0050] Optionally, in some embodiments of the present application, the step "When the target battery is charged from the current state of charge to the next preset state of charge, charge the target battery based on the preset state of charge until the target battery is charged to the cut-off voltage" may specifically include:

[0051] Determine the initial charging current corresponding to the current state of charge;

[0052] Charge the target battery with a constant current based on the initial charging current;

[0053] When the target battery is charged from the current state of charge to the preset state of charge, obtain the first preset charging current corresponding to the preset state of charge value;

[0054] Charge the target battery based on the first preset charging current until the target battery is charged to the cut-off voltage.

[0055] For example, according to the current state of charge (SOC) of the battery, a suitable charging current is selected for charging. In the initial stage of the charging process, the battery is charged with a constant initial charging current until the SOC of the battery reaches a preset threshold. When the SOC of the battery reaches the preset state of charge, a new charging current is selected according to the preset charging strategy. When charging to the next preset state of charge based on this charging current, another new charging current is selected for charging, and so on, until the target battery is charged to the cut-off voltage. When the charging current drops to the set cut-off current (such as 0.01C), it is considered that the battery is fully charged and the charging is terminated.

[0056] For example, specifically, the current SOC of the target battery is 20%, and it needs to be charged to 80% SOC, and the charging cut-off voltage is 4.2V. Starting from 20% SOC, a constant current charging is carried out with a current of 1C (2A) until the SOC reaches 50%. When the SOC reaches 50%, the charging current is switched to 0.5C (1A), and charging continues until the SOC reaches 70%. When the SOC reaches 70%, the charging current is switched to 1C (2A), and charging continues until the SOC reaches 90%. When the SOC reaches 90%, the charging current is switched to 0.5C (1A), and charging continues until the battery voltage approaches the cut-off voltage (such as 4.2V).

[0057] Optionally, in some embodiments of the present application, the step of "charging the target battery based on the first preset charging current until the target battery is charged to the cut-off voltage" may specifically include:

[0058] Set the first preset charging current as the target charging current;

[0059] Charge the target battery based on the target charging current;

[0060] When the target battery is charged from the current preset state of charge value to the next preset state of charge, determine the charging current corresponding to the next preset state of charge as the target charging current, and return to execute the step of charging the target battery based on the target charging current until the target battery is charged to the first state of charge;

[0061] When charging to the first state of charge, charge the target battery to the second state of charge through the second preset charging current;

[0062] When charging to the second state of charge, charge the target battery to the cut-off voltage through the third pre-charge current.

[0063] For example, the current SOC of the target battery is 20%, and the initial charging current is 1C. The target battery is charged at a constant current using the current target charging current. When the SOC reaches 50%, the charging current is switched to 0.5C; when the SOC reaches 70%, the charging current is switched to 1C; when the SOC reaches 90%, the charging current is switched to 0.5C. Repeat the above steps until the SOC of the target battery reaches 90% SOC. After charging to the first state of charge, the battery is charged from 90% SOC to 95% SOC using a charging current of 0.5C. After charging to the second state of charge, the battery is charged from 95% SOC to the cut-off voltage (such as 4.2V) using a charging current of 0.2C.

[0064] The complete charging process is as follows: If the rated capacity of the target battery is 2Ah, the current SOC is 20%, and the charging cut-off voltage is 4.2V, the charging process is as follows:

[0065] The charging current corresponding to the current SOC of 20% is 1C (2A), that is, the initial charging current is 1C (2A); starting from 20% SOC, charging is carried out using a current of 1C (2A) until the SOC reaches 50%; when the SOC reaches 50%, the charging current is switched to 0.5C (1A), and charging continues until the SOC reaches 70%; when the SOC reaches 70%, the charging current is switched to 1C (2A), and charging continues until the SOC reaches 90%; then, the battery is charged from 90% SOC to 95% SOC using a charging current of 0.5C (1A). Finally, the battery is charged from 95% SOC to the cut-off voltage of 4.2V using a charging current of 0.2C (0.4A).

[0066] Optionally, in some embodiments of the present application, the preset state of charge includes a first preset state-of-charge value, a second preset state-of-charge value, a third preset state-of-charge value, a fourth preset state-of-charge value, a fifth preset state-of-charge value, and a sixth preset state-of-charge value; the range of the first preset state-of-charge value is 5% to 20%; the range of the second preset state-of-charge value is 10% to 50%; the range of the third preset state-of-charge value is 40% to 70%; the range of the fourth preset state-of-charge value is 50% to 80%; the range of the first preset state-of-charge value is 70% to 95%.

[0067] Optionally, in some embodiments of the present application, the first preset charging current includes a first charging current value, a second charging current value, a third charging current value, a fourth charging current value, a fifth charging current value, and a sixth charging current value;

[0068] wherein, the charging rates of the first charging current value, the second charging current value, the third charging current value, the fourth charging current value, the fifth charging current value, and the sixth charging current value increase in sequence, or;

[0069] The charging rates of the first charging current value, the second charging current value, the third charging current value, the fourth charging current value, the fifth charging current value, and the sixth charging current value decrease in sequence.

[0070] For example, the current SOC of the target battery is 20%, and the charging cut-off voltage is 4.2V. Starting from 20% SOC, constant current charging is carried out using the first charging current value (0.5C, 1A) until the SOC reaches 30%. When the SOC reaches 30%, switch to the second charging current value (1.0C, 2A) and continue charging until the SOC reaches 40%. When the SOC reaches 40%, switch to the third charging current value (1.5C, 3A) and continue charging until the SOC reaches 50%. When the SOC reaches 50%, switch to the fourth charging current value (2.0C, 4A) and continue charging until the SOC reaches 60%. When the SOC reaches 60%, switch to the fifth charging current value (2.5C, 5A) and continue charging until the SOC reaches 70%. When the SOC reaches 70%, switch to the sixth charging current value (3.0C, 6A) and continue charging until the SOC reaches 80%.

[0071] It should be noted that the first preset charging current corresponds to six different charging current values (C1, C2, C3, C4, C5, C6), and there can be various change forms for the charging rates of these values. The change forms of the charging rate can be increasing, decreasing, increasing first and then decreasing, increasing first, then decreasing and then increasing, etc., and the specific form is flexibly adjusted according to the battery characteristics and charging strategy. For example, C1 < C2 < C3 < C4 < C5 < C6; C1 > C2 > C3 > C4 > C5 > C6; C1 < C2 <c3>C4 > C5 > C6; C1 < C2 <c3>C4 < C5 < C6; C1 > C2 > C3 < C4 < C5 < C6; C1 <c2> C3 <c4>C5 < C6 and so on.

[0072] Optionally, in some embodiments of the present application, after the step of "charging the target battery to the cut-off voltage with a third pre-charge current when charging to the second state of charge", it may further specifically include:

[0073] Let the target battery charged to the cut-off voltage stand for a second duration.

[0074] The standing step helps to stabilize the battery state and ensure that the battery reaches the best performance after charging.

[0075] Optionally, in some embodiments of the present application, the range of the first duration is 10 min to 120 min; the range of the second duration is 10 min to 120 min. For example, the first duration is 30 minutes and the second duration is 40 minutes. That is, when the state of charge of the target battery is 0%, the target battery stands for 30 minutes; when the target battery is charged to the cut-off voltage, the target battery stands for 40 minutes.

[0076] To further understand the charge and discharge control scheme of the present application, the following will be described in the form of an experimental group and a control group, specifically as follows:

[0077] Experimental group: Charge the target battery: 0 - 10% SOC, constant current charging at 1C; 10% - 30% SOC, constant current charging at 2.0C; 30% - 50% SOC, constant current charging at 3.0C; 50% - 60% SOC, constant current charging at 2.5C; 60% - 80% SOC, constant current charging at 1.8C; 80% - 100% SOC, constant current charging at 1C to 3.65V, constant voltage charging at 3.65V until the cut-off current is 0.1C; after full charge, stand for 30 min; then, discharge the target battery, constant current discharge at 1C to 2.5V, stand for 30 min.

[0078] Control group: Charge the target battery to 100% SOC, constant current charging at 0.5C to 3.65V, constant voltage charging at 3.65V until the cut-off current is 0.1C; after full charge, stand for 30 min; then, discharge the target battery, constant current discharge at 1C to 2.5V, stand for 30 min.

[0079] Cycling 900 times at a high temperature of 45°C, the capacity retention rate of the experimental group is 84%, and the capacity retention rate of the control group is 76%; cycling 1800 times at room temperature of 25°C, the capacity retention rate of the experimental group is 88%, and the capacity retention rate of the control group is 82%. The experimental curves are as Figure 2 and Figure 3 shown.

[0080] 103. Discharge the target battery charged to the cut-off voltage until the state of charge of the target battery is 0%, and let the target battery stand for a first duration.

[0081] Discharge the battery charged to the cut-off voltage until the SOC of the battery drops to 0%. This process is used to test the discharge performance of the battery or conduct a cycle test of the battery. For example, discharge the battery at a current of 1C (2A) until the battery voltage drops to the preset discharge cut-off voltage (such as 2.5V), at which time the SOC is close to 0%. After discharging to 0% SOC, leave the target battery standing for 30 minutes. The standing time is used to stabilize the chemical state inside the battery and ensure the best performance of the battery in subsequent use.

[0082] The embodiment of the present application provides a charge-discharge control method for improving the cycle performance of a battery. After obtaining the current state of charge of the target battery, when the target battery is charged from the current state of charge to the next preset state of charge, the target battery is charged based on the preset state of charge until the target battery is charged to the cut-off voltage. Finally, the target battery charged to the cut-off voltage is discharged until the state of charge of the target battery is 0%, and the target battery is left standing for a first period of time. In the charge-discharge control solution for improving the cycle performance of the battery provided by the present application, the target battery is charged from the current state of charge to the next preset state of charge, the target battery is charged based on the preset state of charge until the target battery is charged to the cut-off voltage, and then, the target battery charged to the cut-off voltage is discharged until the state of charge of the target battery is 0%. Thus, deep charge and discharge of the target battery are realized, the endurance of the target battery is improved, and the cycle performance of the lithium battery is improved.

[0083] In addition, the embodiment of the present application also provides an electronic device, such as Figure 4 shown, which shows the structural schematic diagram of the electronic device involved in the embodiment of the present application. Specifically:

[0084] The electronic device may include a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, an input unit 304 and other components. Those skilled in the art can understand that Figure 4 the structure of the electronic device shown in

[0085] The processor 301 is the control center of the electronic device, connecting various parts of the entire electronic device through various interfaces and circuits. By running or executing software programs and / or modules stored in the memory 302, and calling the data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 301 either.

[0086] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and charge-discharge control for improving battery cycle performance by running the software programs and modules stored in the memory 302. The memory 302 mainly includes a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required for at least one function (such as the sound playback function, image playback function, etc.); the data storage area can store data created according to the use of the electronic device. In addition, the memory 302 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage devices. Correspondingly, the memory 302 can also include a memory controller to provide the processor 301 with access to the memory 302.

[0087] The electronic device also includes a power supply 303 for powering each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 303 can also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0088] The electronic device may further include an input unit 304, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0089] Although not shown, the electronic device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302 to realize various functions as follows:

[0090] Obtain the current state of charge of the target battery; when the target battery is charged from the current state of charge to the next preset state of charge, charge the target battery based on the preset state of charge until the target battery is charged to the cut-off voltage; discharge the target battery charged to the cut-off voltage until the state of charge of the target battery is 0%, and then let the target battery stand for the first duration.

[0091] For the specific implementation of each of the above operations, reference can be made to the previous embodiments, which will not be elaborated here.

[0092] After obtaining the current state of charge of the target battery in the embodiment of the present application, when the target battery is charged from the current state of charge to the next preset state of charge, charge the target battery based on the preset state of charge until the target battery is charged to the cut-off voltage. Finally, discharge the target battery charged to the cut-off voltage until the state of charge of the target battery is 0%, and then let the target battery stand for the first duration. The charge-discharge control scheme for improving the battery cycle performance provided by the present application is that the target battery is charged from the current state of charge to the next preset state of charge, and the target battery is charged based on the preset state of charge until the target battery is charged to the cut-off voltage. Then, the target battery charged to the cut-off voltage is discharged until the state of charge of the target battery is 0%. Thus, deep charge and discharge of the target battery are realized, the endurance of the target battery is improved, and the cycle performance of the lithium battery is improved.

[0093] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructions, or by controlling relevant hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0094] Therefore, the embodiment of the present application provides a storage medium, in which multiple instructions are stored, and the instructions can be loaded by a processor to execute the steps in any charge-discharge control method for improving the battery cycle performance provided by the embodiment of the present application. For example, the instructions can execute the following steps:

[0095] Obtain the current state of charge of the target battery; when the target battery is charged from the current state of charge to the next preset state of charge, charge the target battery based on the preset state of charge until the target battery is charged to the cut-off voltage; discharge the target battery charged to the cut-off voltage until the state of charge of the target battery is 0%, and then let the target battery stand for the first duration.

[0096] For the specific implementation of each of the above operations, reference can be made to the previous embodiments, which will not be elaborated here.

[0097] Among them, the storage medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc.

[0098] Since the instructions stored in the storage medium can execute the steps in any of the charge and discharge control methods for improving the battery cycle performance provided by the embodiments of the present application, the beneficial effects achievable by any of the charge and discharge control methods for improving the battery cycle performance provided by the embodiments of the present application can be realized. For details, see the previous embodiments and will not be repeated here.

[0099] The above has introduced in detail a charge and discharge control method, an electronic device, and a storage medium for improving the battery cycle performance provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application. < / c2>

Claims

1. A charge and discharge control method for improving battery cycle performance, characterized in that: include: Get the current state of charge of the target battery; When the target battery is charged from the current state of charge to a next preset state of charge, the target battery is charged based on the preset state of charge until the target battery is charged to a cut-off voltage; The target battery charged to the cut-off voltage is discharged until the state of charge of the target battery is 0%, and the target battery is left to stand for a first time period.

2. The charge and discharge control method according to claim 1, characterized in that: When the target battery is charged from the current state of charge to a preset state of charge, charging the target battery based on the preset charge value until the target battery is charged to a cut-off voltage includes: Determining an initial charging current corresponding to the current state of charge; Performing constant current charging on the target battery based on the initial charging current; When the target battery is charged from the current state of charge to a preset state of charge, obtaining a first preset charging current corresponding to the preset charge value; The target battery is charged based on the first preset charging current until the target battery is charged to a cut-off voltage.

3. The charge and discharge control method according to claim 2, characterized in that: The charging the target battery based on the first preset charging current until the target battery is charged to a cut-off voltage includes: Setting the first preset charging current as a target charging current; charging the target battery based on the target charging current; When the target battery is charged from the current preset charge value to the next preset state of charge, the charging current corresponding to the next preset state of charge is determined as the target charging current, and the step of charging the target battery based on the target charging current is returned to be executed until the target battery is charged to the first state of charge; When charging to the first state of charge, charging the target battery to a second state of charge by a second preset charging current; After charging to the second state of charge, the target battery is charged to a cut-off voltage by a third pre-charge current.

4. The charge and discharge control method according to claim 3, characterized in that: The preset state of charge includes a first preset charge value, a second preset charge value, a third preset charge value, a fourth preset charge value, a fifth preset charge value and a sixth preset charge value; The first preset charge value ranges from 5% to 20%; the second preset charge value ranges from 10% to 50%; the third preset charge value ranges from 40% to 70%; the fourth preset charge value ranges from 50% to 80%; and the first preset charge value ranges from 70% to 95%.

5. The charge and discharge control method according to claim 3, characterized in that: The charging rate corresponding to the first charging current is 0.5C to 5C, the charging rate corresponding to the second preset charging current is 0.01C to 5C, and the charging rate corresponding to the third charging current is 0.3C to 2C.

6. The charge and discharge control method according to claim 3, characterized in that: The first preset charging current includes a first charging current value, a second charging current value, a third charging current value, a fourth charging current value, a fifth charging current value and a sixth charging current value; The charging rates of the first charging current value, the second charging current value, the third charging current value, the fourth charging current value, the fifth charging current value and the sixth charging current value are increased in sequence, or; The charging rates of the first charging current value, the second charging current value, the third charging current value, the fourth charging current value, the fifth charging current value and the sixth charging current value decrease in sequence.

7. The charge and discharge control method according to claim 3, characterized in that: After charging to the second state of charge and charging the target battery to a cut-off voltage through a third pre-charging current, the method further includes: The target battery charged to a cut-off voltage is left to stand for a second period of time.

8. The charge and discharge control method according to claim 7, characterized in that: The first duration ranges from 10 minutes to 120 minutes; the second duration ranges from 10 minutes to 120 minutes.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the charge and discharge control method for improving the battery cycle performance as described in any one of claims 1-8 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the charge and discharge control method for improving the battery cycle performance as described in any one of claims 1 to 8 are implemented.

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