Charging method, device, equipment and medium

Abstract

The invention provides a charging method, device and equipment and a medium, and relates to the technical field of batteries, and the method comprises the steps: carrying out the capacity calibration of a to-be-charged battery, and obtaining the calibration capacity of the to-be-charged battery; determining the ith charging current based on the calibration capacity and the ith preset charging rate; the battery to be charged is subjected to constant-current charging successively in N steps until the actual voltage of the battery to be charged is larger than or equal to the first preset cut-off voltage, the ith step comprises the steps that the battery to be charged is subjected to constant-current charging through the ith charging current till the ith preset time condition or the ith preset electric quantity condition is met, N is larger than or equal to 2, and i is larger than or equal to 1 and smaller than or equal to N; carrying out constant-voltage charging on the to-be-charged battery by adopting a preset charging voltage; if the actual charging current of the to-be-charged battery is smaller than or equal to the preset cut-off current, it is determined that charging of the to-be-charged battery is finished. According to the invention, step-by-step constant-current and constant-voltage charging is realized, the charging safety is improved, and the capacity retention rate of the battery is also improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a charging method, device, equipment and medium. Background Art

[0002] With the widespread application of lithium-ion batteries, the performance requirements of existing technologies for lithium-ion batteries are also increasing. The traditional constant current and constant voltage charging method has a fixed charging current. As the cycle progresses, it is easy to cause aging of the battery material structure, leading to the occurrence of lithium precipitation, and then causing safety accidents. Therefore, proposing a safe and reliable charging method has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a charging method to improve the charging safety of the battery. The present invention provides the following technical solutions:

[0004] In a first aspect, the present invention provides a charging method, the method comprising:

[0005] Capacity calibration of the battery to be charged is performed to obtain the calibrated capacity of the battery to be charged;

[0006] Determining an i-th charging current based on the calibrated capacity and the i-th preset charging rate;

[0007] The battery to be charged is charged with a constant current in N steps until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step comprises: charging the battery to be charged with the i-th charging current at a constant current until an i-th preset time condition or an i-th preset power condition is met, wherein N≥2, 1≤i≤N;

[0008] Using a preset charging voltage to perform constant voltage charging on the battery to be charged;

[0009] If the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, it is determined that the charging of the battery to be charged is finished.

[0010] In one embodiment, the capacity calibration of the battery to be charged to obtain the calibrated capacity of the battery to be charged includes: performing constant current and constant voltage charging on the battery to be charged based on a preset calibration current and a preset calibration voltage until the actual charging current of the battery to be charged is less than or equal to the preset cut-off current; performing constant current discharge on the battery to be charged using the preset calibration current until the actual voltage of the battery to be charged is less than or equal to a second preset cut-off voltage, and recording the discharge time; and determining the calibrated capacity based on the discharge time and the preset calibration current.

[0011] In one embodiment, before the constant-current and constant-voltage charging of the battery to be charged based on the preset calibration current and the preset calibration voltage, it also includes: using the preset calibration current to perform constant-current discharge on the battery to be charged until the actual voltage of the battery to be charged is less than or equal to the second preset cut-off voltage.

[0012] In one embodiment, the i-th preset time condition includes: the charging time is greater than or equal to the i-th preset time, and the use of the i-th charging current constant current to charge the battery to be charged until the i-th preset condition is met includes: the use of the i-th charging current constant current to charge the battery to be charged until the charging time is greater than or equal to the i-th preset time.

[0013] In one embodiment, the i-th preset power condition includes: the current power of the battery to be charged is greater than or equal to the i-th preset power value, and the use of the i-th charging current constant current to charge the battery to be charged until the i-th preset condition is met includes: using the i-th charging current constant current to charge the battery to be charged until the current power of the battery to be charged is greater than or equal to the i-th preset power value, wherein the i-th preset power is less than the i+1-th preset power.

[0014] In one embodiment, after determining that the charging of the battery to be charged is completed, it also includes: discharging the battery to be charged at a constant current to the first preset cut-off voltage, and recording the number of charge and discharge cycles, and determining whether to re-calibrate the capacity of the battery to be charged according to the number of charge and discharge cycles.

[0015] In one embodiment, judging whether to recalibrate the capacity of the battery to be charged according to the number of charge and discharge cycles includes: if the number of charge and discharge cycles is greater than or equal to a preset number of cycles, determining to recalibrate the capacity of the battery to be charged.

[0016] In a second aspect, the present invention provides a charging device, the device comprising:

[0017] A calibration module, used for calibrating the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged;

[0018] A determination module, configured to determine an i-th charging current based on the calibrated capacity and an i-th preset charging rate;

[0019] A first charging module is used to perform constant current charging on the battery to be charged in N steps successively until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step comprises: using the i-th charging current to charge the battery to be charged at a constant current until an i-th preset time condition or an i-th preset power condition is met, wherein N≥2, 1≤i≤N;

[0020] A second charging module, used to perform constant voltage charging on the battery to be charged using a preset charging voltage;

[0021] The judgment module is used to determine that the charging of the battery to be charged is completed if the actual charging current of the battery to be charged is less than or equal to a preset cut-off current.

[0022] In a third aspect, the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program runs on the processor, the charging method described in the first aspect is executed.

[0023] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the charging method described in the first aspect is implemented.

[0024] The charging method, device, equipment and medium provided by the embodiments of the present invention calibrate the capacity of a battery to be charged to obtain the calibrated capacity of the battery to be charged; determine the i-th charging current based on the calibrated capacity and the i-th preset charging rate; perform constant current charging on the battery to be charged in N steps one by one until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step includes: using the i-th charging current to charge the battery to be charged at a constant current until the i-th preset time condition or the i-th preset power condition is met, wherein N≥2, 1≤i≤N; using a preset charging voltage to charge the battery to be charged at a constant voltage; if the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, it is determined that the charging of the battery to be charged is terminated, thereby realizing step-by-step constant current and constant voltage charging, improving charging safety, and improving the capacity retention rate of the battery.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of a charging method provided by an embodiment of the present invention is shown;

[0028] Figure 2 Another schematic diagram of the charging method provided by an embodiment of the present invention is shown;

[0029] Figure 3 A diagram showing the relationship between charging voltage, charging current and capacity provided by an embodiment of the present invention;

[0030] Figure 4 A comparison diagram of cycle retention rates of two different charging methods provided in an embodiment of the present invention is shown;

[0031] Figure 5 The 0.05C discharge differential voltage curves of two different charging methods after 1000 cycles provided by the embodiment of the present invention are shown;

[0032] Figure 6 A schematic diagram of the structure of a charging device provided by an embodiment of the present invention is shown;

[0033] Figure 7 A schematic structural diagram of an electronic device provided by an embodiment of the present invention is shown.

[0034] Description of main component symbols:

[0035] 600 - charging device; 610 - calibration module; 620 - determination module; 630 - first charging module; 640 - second charging module; 650 - judgment module; 700 - electronic device; 701 - transceiver; 702 - processor; 703 - memory. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] Example 1

[0040] The existing technology not only requires the battery to have the characteristics of high energy and high power, but also requires the battery to have a long cycle life and high energy utilization. The traditional constant current constant voltage charging (CC-CV) method is a strategy widely used in lithium-ion battery charging. It combines the two stages of constant current charging (CC) and constant voltage charging (CV). Specifically, it is first charged with a constant current, and when the voltage reaches the cut-off voltage, it switches to constant voltage charging until the current drops to the cut-off current. However, this charging method of the existing technology is prone to lithium precipitation as the number of charge and discharge times increases, which in turn causes safety accidents. For this, please refer to Figure 1 , the present application proposes a charging method, including steps S110 to S150.

[0041] Step S110, calibrating the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged.

[0042] In this embodiment, before the battery to be charged is charged step by step, a small current of a certain rate is first used to calibrate the capacity of the battery to be charged within a certain voltage range, and the discharge capacity at the rate is used as the calibrated capacity of the battery to be charged.

[0043] In one embodiment, see Figure 2 , step S110 includes: steps S111 to S113.

[0044] Step S111 , performing constant current and constant voltage charging on the battery to be charged based on a preset calibration current and a preset calibration voltage, until the actual charging current of the battery to be charged is less than or equal to the preset cut-off current.

[0045] Specifically, a small current at a constant rate, that is, a preset calibration current, is used to perform constant current charging on the battery to be charged until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, such as 3.6V; and the preset calibration voltage is used to perform constant voltage charging on the battery to be charged until the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, such as 0.05C. At this time, it can be considered that the battery to be charged is in a fully charged state.

[0046] Taking a lithium iron phosphate battery with a rated capacity of 15Ah as an example, firstly, a preset rated current of 0.2C=3A is used to charge the battery with a constant current until the actual voltage of the battery is greater than or equal to a first preset cut-off voltage, such as 3.6V; then, a preset rated voltage, such as 3.6V, is used to charge the battery with a constant voltage until the actual charging current of the battery is less than or equal to the preset cut-off current of 0.05C=0.75A, at which time the battery is determined to be fully charged. Wherein, C represents the rated capacity of the battery.

[0047] It should be noted that before constant-current and constant-voltage charging is performed on the battery to be charged, the battery to be charged needs to be left to stand for a preset standing time, such as 30 minutes, so that the battery to be charged reaches an equilibrium potential.

[0048] Step S112, using the preset calibration current to perform constant current discharge on the battery to be charged until the actual voltage of the battery to be charged is less than or equal to a second preset cut-off voltage, and recording the discharge time.

[0049] Specifically, a preset calibration current is used to discharge the rechargeable battery at a constant current until the actual voltage of the rechargeable battery is less than or equal to the second preset cut-off voltage, for example, 2.5V. At this time, the rechargeable battery can be considered to be fully discharged, and the calibration capacity is determined based on the discharge time and the preset calibration current. Still taking the above-mentioned lithium iron phosphate battery as an example, a preset calibration current of 0.2C=3A is used to discharge the battery at a constant current until the actual voltage of the battery is less than or equal to the second preset cut-off voltage of 2.5V. At this time, the calibration capacity of the battery can be determined based on the discharge time and the preset calibration current.

[0050] It should be noted that before the preset calibration current is used to perform constant current discharge on the rechargeable battery, the rechargeable battery also needs to be left to stand for a preset standing time so that the rechargeable battery reaches an equilibrium potential.

[0051] Step S113, determining the calibrated capacity based on the discharge time and the preset calibrated current.

[0052] Specifically, the rated capacity = discharge time × preset rated current.

[0053] In one embodiment, before the constant-current and constant-voltage charging of the battery to be charged based on the preset calibration current and the preset calibration voltage, it also includes: using the preset calibration current to perform constant-current discharge on the battery to be charged until the actual voltage of the battery to be charged is less than or equal to the second preset cut-off voltage.

[0054] It is understandable that, in order to ensure that the battery to be charged is completely discharged, that is, the power is 0 before the capacity calibration is performed, the battery to be charged needs to be discharged to an actual voltage less than or equal to the second preset cut-off voltage, for example, 2.5 V. It should be noted that before the battery to be charged is discharged at a constant current, the battery to be charged also needs to be stationary for a preset rest time.

[0055] Step S120, determining an i-th charging current based on the calibrated capacity and the i-th preset charging rate.

[0056] In this embodiment, the i-th charging current = the i-th preset charging rate × the rated capacity. In order to avoid the lithium plating phenomenon, the existing constant current and constant voltage charging method of the embodiment of the present application is improved, specifically including: the constant current discharge process includes multiple different steps, each step corresponds to a different charging current. Taking eight constant current charging steps as an example, the first step corresponds to the first preset charging rate, such as 0.5C; the second step corresponds to the second preset charging rate, such as 1.65C; the third step corresponds to the third preset charging rate, such as 1.45C; the fourth step corresponds to the fourth preset charging rate, such as 1.25C; the fifth step corresponds to the fifth preset charging rate, such as 1.05C; the sixth step corresponds to the sixth preset charging rate, such as 0.85C; the seventh step corresponds to the seventh preset charging rate, such as 0.65C; the eighth step corresponds to the eighth preset charging rate, such as 0.5C.

[0057] It should be noted that the preset charging rate corresponding to each process step is specifically determined according to the lithium deposition boundary of the battery, which is only used as an example and is not limited. Preferably, the i-th preset charging rate>the i+1-th preset charging rate.

[0058] Step S130, performing constant current charging on the battery to be charged in N steps successively until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step includes: using the i-th charging current to constantly charge the battery to be charged until an i-th preset time condition or an i-th preset power condition is met, wherein N≥2, 1≤i≤N.

[0059] In this embodiment, constant current and constant voltage charging of the rechargeable battery is divided into two stages, one is constant current charging, and the other is constant voltage charging. Specifically, the constant current charging is divided into N steps, wherein the i-th step includes: using the i-th charging current to perform constant current charging on the rechargeable battery until the rechargeable battery meets the i-th preset time condition or the i-th preset power condition.

[0060] It should be noted that the value of N, as well as the value of the i-th charging current and the value of the i-th preset time corresponding to each process step are determined according to the lithium plating boundary of the battery and are not limited here.

[0061] In one embodiment, the i-th preset time condition includes: the charging time is greater than or equal to the i-th preset time, and the use of the i-th charging current constant current to charge the battery to be charged until the i-th preset condition is met includes: the use of the i-th charging current constant current to charge the battery to be charged until the charging time is greater than or equal to the i-th preset time.

[0062] In this embodiment, each step in the constant current charging process corresponds to a different preset time. During the i-th constant current charging, the i-th charging current is used to perform constant current charging on the rechargeable battery, and the charging time is the i-th preset time. After the i-th charging reaches the i-th preset time, the i+1-th charging begins. Preferably, the i-th preset time < the i+1-th preset time.

[0063] In one embodiment, the i-th preset power condition includes: the current power of the battery to be charged is greater than or equal to the i-th preset power value, and the use of the i-th charging current constant current to charge the battery to be charged until the i-th preset condition is met includes: using the i-th charging current constant current to charge the battery to be charged until the current power of the battery to be charged is greater than or equal to the i-th preset power value, wherein the i-th preset power is less than the i+1-th preset power.

[0064] In this embodiment, the rechargeable battery is charged in steps, wherein the i-th charging process is: the rechargeable battery is charged at a constant current using the i-th charging current, and the current power of the battery is monitored during the charging process. If the current power is greater than or equal to the i-th preset power value, it is determined that the i-th charging is completed, and then the i+1-th charging begins.

[0065] Step S140, using a preset charging voltage to perform constant voltage charging on the battery to be charged.

[0066] In this embodiment, when the battery to be charged is charged with a step-by-step constant current until the actual voltage of the battery to be charged is greater than or equal to the first preset cut-off voltage, the preset charging voltage is used to start constant voltage charging of the battery to be charged.

[0067] It should be noted that constant voltage charging allows the battery to be charged to be kept at a smaller current value as much as possible when it is charged to a preset cut-off voltage, so as to eliminate the polarization caused by the overpotential of the positive and negative electrodes inside the battery to be charged, prevent the voltage of the battery to be charged from rebounding sharply after charging is completed, and make the battery to be charged as fully charged as possible.

[0068] Step S150: If the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, it is determined that the charging of the battery to be charged is finished.

[0069] It can be understood that during the step-by-step constant current charging process, the actual voltage of the battery to be charged gradually increases. During the constant voltage charging process of the battery to be charged using a preset charging voltage, as the battery power increases, the actual charging current of the battery gradually decreases. When it decreases to the preset cut-off current value, it can be considered that the battery to be charged is fully charged.

[0070] In one embodiment, after determining that the charging of the battery to be charged is completed, it also includes: discharging the battery to be charged at a constant current to the first preset cut-off voltage, and recording the number of charge and discharge cycles, and determining whether to re-calibrate the capacity of the battery to be charged according to the number of charge and discharge cycles.

[0071] In this embodiment, each time the battery to be charged completes a charge and discharge cycle, the number of charge and discharge cycles increases by one. When the number of charge and discharge cycles is greater than or equal to the preset number of cycles, the capacity of the battery to be charged needs to be recalibrated.

[0072] In one embodiment, judging whether to recalibrate the capacity of the battery to be charged according to the number of charge and discharge cycles includes: if the number of charge and discharge cycles is greater than or equal to a preset number of cycles, determining to recalibrate the capacity of the battery to be charged.

[0073] It is understandable that the performance of a battery to be charged will gradually change as the number of cycles increases, causing its actual capacity to decrease. Recalibrating the capacity ensures that subsequent charging and usage strategies are based on the current true state of the battery, thereby optimizing charging efficiency, extending battery life and ensuring safety.

[0074] In order to compare the cycle effects of the fixed-rate constant-current and constant-voltage charging method and the step-by-step constant-current and constant-voltage charging method provided in the embodiment of the present application, a comparative experiment was carried out with two identical cylindrical batteries as test objects, wherein the test steps of the fixed-rate constant-current and constant-voltage charging method are shown in Table 1 below, and the test steps of the step-by-step constant-current and constant-voltage charging method are shown in Table 2 below.

[0075] Table 1 Test steps of fixed rate constant current constant voltage charging method

[0076]

[0077] Table 2 Test steps of the step-by-step constant current and constant voltage charging method

[0078]

[0079] See also Figure 3 , Figure 4 and Figure 5 ,in, Figure 3 The relationship between charging voltage, charging current and capacity under the step-by-step constant current and constant voltage charging mode is shown; Figure 4 A comparison chart of the cycle retention rates of two different charging methods is shown; Figure 5 The 0.05C discharge differential voltage curves of two different charging methods after 1000 cycles are shown. Figure 4 It can be seen from the comparison of the implementation data shown that under the charging method provided in the embodiment of the present application, the cycle retention rate of the battery is higher; according to Figure 5 From the comparison of the experimental data shown, it can be seen that the charging method provided in the embodiment of the present application does not produce any lithium plating signal, and the charging safety is higher.

[0080] The charging method provided in the embodiment of the present application includes: calibrating the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged; determining the i-th charging current based on the calibrated capacity and the i-th preset charging rate; performing constant current charging on the battery to be charged in N steps one by one until the actual voltage of the battery to be charged is greater than or equal to the first preset cut-off voltage, wherein the i-th step includes: using the i-th charging current to charge the battery to be charged at a constant current until the i-th preset time condition or the i-th preset power condition is met, wherein N≥2, 1≤i≤N; using a preset charging voltage to charge the battery to be charged at a constant voltage; if the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, determining that the charging of the battery to be charged is finished. The present application improves the charging safety and the capacity retention rate of the battery by charging at a constant current and a constant voltage step by step.

[0081] Example 2

[0082] Also, see Figure 6 The present application also provides a charging device 600, the device comprising:

[0083] The calibration module 610 is used to calibrate the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged.

[0084] The determination module 620 is used to determine the i-th charging current based on the calibrated capacity and the i-th preset charging rate.

[0085] The first charging module 630 is used to perform constant current charging on the battery to be charged in N steps successively until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step includes: using the i-th charging current to charge the battery to be charged at a constant current until an i-th preset time condition or an i-th preset power condition is met, wherein N≥2, 1≤i≤N.

[0086] The second charging module 640 is used to perform constant voltage charging on the battery to be charged using a preset charging voltage.

[0087] The judgment module 650 is used to determine that the charging of the battery to be charged is completed if the actual charging current of the battery to be charged is less than or equal to a preset cut-off current.

[0088] The charging device 600 provided in the embodiment of the present application is used to implement the charging method provided in the above method embodiment 1, and will not be described again here to avoid repetition.

[0089] The charging device provided in the embodiment of the present application calibrates the capacity of the battery to be charged by a calibration module to obtain the calibrated capacity of the battery to be charged; the determination module determines the i-th charging current based on the calibrated capacity and the i-th preset charging rate; the first charging module performs constant-current charging on the battery to be charged in N steps successively until the actual voltage of the battery to be charged is greater than or equal to the first preset cut-off voltage, wherein the i-th step includes: using the i-th charging current to charge the battery to be charged at a constant current until the i-th preset time condition or the i-th preset power condition is met, wherein N≥2, 1≤i≤N; the second charging module performs constant-voltage charging on the battery to be charged by using a preset charging voltage; the judgment module determines that the charging of the battery to be charged is completed if the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, thereby improving the charging safety and the capacity retention rate of the battery.

[0090] Example 3

[0091] In addition, an embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program runs on the processor, the charging method provided in Example 7 is executed.

[0092] For details, see Figure 7 The electronic device 700 includes: a transceiver 701, a bus interface and a processor 702, wherein the processor 702 is used to calibrate the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged; determine the i-th charging current based on the calibrated capacity and the i-th preset charging rate; perform constant current charging on the battery to be charged in N steps one by one until the actual voltage of the battery to be charged is greater than or equal to the first preset cut-off voltage, wherein the i-th step includes: using the i-th charging current to charge the battery to be charged at a constant current until the i-th preset time condition or the i-th preset power condition is met, wherein N≥2, 1≤i≤N; using a preset charging voltage to charge the battery to be charged at a constant voltage; if the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, it is determined that the charging of the battery to be charged is completed.

[0093] In the embodiment of the present invention, the electronic device 700 further includes a memory 703. Figure 7In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 702 and memory represented by memory 703. The bus architecture may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 701 may be a plurality of components, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 702 is responsible for managing the bus architecture and general processing, and the memory 703 may store data used by the processor 702 when performing operations.

[0094] The electronic device 700 provided in the embodiment of the present invention can execute the charging method provided in the above method embodiment 1, which will not be described again to avoid repetition.

[0095] Example 4

[0096] In addition, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the charging method provided in Embodiment 1 is implemented.

[0097] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0098] The computer-readable storage medium provided in this embodiment can implement the charging method provided in Embodiment 1, and will not be described again here to avoid repetition.

[0099] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0100] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0101] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A charging method, characterized in that: The method comprises: Capacity calibration of the battery to be charged is performed to obtain the calibrated capacity of the battery to be charged; Determining an i-th charging current based on the calibrated capacity and the i-th preset charging rate; The battery to be charged is charged with a constant current in N steps until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step comprises: charging the battery to be charged with the i-th charging current at a constant current until an i-th preset time condition or an i-th preset power condition is met, wherein N≥2, 1≤i≤N; Using a preset charging voltage to perform constant voltage charging on the battery to be charged; If the actual charging current of the battery to be charged is less than or equal to the preset cut-off current, it is determined that the charging of the battery to be charged is finished.

2. The charging method according to claim 1, characterized in that: The step of calibrating the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged includes: Based on a preset calibration current and a preset calibration voltage, the battery to be charged is charged with a constant current and a constant voltage until the actual charging current of the battery to be charged is less than or equal to the preset cut-off current; Using the preset calibration current to perform constant current discharge on the battery to be charged until the actual voltage of the battery to be charged is less than or equal to a second preset cut-off voltage, and recording the discharge time; The rated capacity is determined based on the discharge time and the preset rated current.

3. The charging method according to claim 2, characterized in that: Before the battery to be charged is charged with constant current and constant voltage based on the preset calibration current and the preset calibration voltage, the method further includes: The preset calibration current is used to perform constant current discharge on the battery to be charged until the actual voltage of the battery to be charged is less than or equal to the second preset cut-off voltage.

4. The charging method according to claim 1, characterized in that: The i-th preset time condition includes: the charging time is greater than or equal to the i-th preset time, and the i-th charging current is used to charge the battery to be charged until the i-th preset condition is met, including: The battery to be charged is charged with the i-th charging current at a constant current until the charging time is greater than or equal to the i-th preset time.

5. The charging method according to claim 1, characterized in that: The i-th preset power condition includes: the current power of the battery to be charged is greater than or equal to the i-th preset power value, and the constant current charging of the battery to be charged by the i-th charging current until the i-th preset condition is met includes: The battery to be charged is charged with the i-th charging current at a constant current until the current power of the battery to be charged is greater than or equal to the i-th preset power value, wherein the i-th preset power is less than the i+1-th preset power.

6. The charging method according to any one of claims 1 to 5, characterized in that: After determining that the charging of the battery to be charged is completed, the method further includes: The battery to be charged is discharged at a constant current to the first preset cut-off voltage, and the number of charge and discharge cycles is recorded, and it is determined whether to recalibrate the capacity of the battery to be charged according to the number of charge and discharge cycles.

7. The charging method according to claim 6, characterized in that: The determining whether to recalibrate the capacity of the battery to be charged according to the number of charge and discharge cycles includes: If the number of charge and discharge cycles is greater than or equal to a preset number of cycles, it is determined to recalibrate the capacity of the battery to be charged.

8. A charging device, characterized in that: The device comprises: A calibration module, used for calibrating the capacity of the battery to be charged to obtain the calibrated capacity of the battery to be charged; A determination module, configured to determine an i-th charging current based on the calibrated capacity and an i-th preset charging rate; A first charging module is used to perform constant current charging on the battery to be charged in N steps successively until the actual voltage of the battery to be charged is greater than or equal to a first preset cut-off voltage, wherein the i-th step comprises: using the i-th charging current to charge the battery to be charged at a constant current until an i-th preset time condition or an i-th preset power condition is met, wherein N≥2, 1≤i≤N; A second charging module, used to perform constant voltage charging on the battery to be charged using a preset charging voltage; The judgment module is used to determine that the charging of the battery to be charged is completed if the actual charging current of the battery to be charged is less than or equal to a preset cut-off current.

9. An electronic device, characterized in that: The device comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is run on the processor, the charging method according to any one of claims 1 to 7 is executed.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the charging method according to any one of claims 1 to 7 is implemented.

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