Charging method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a charging method and device, electronic equipment and a storage medium, and belongs to the technical field of lithium ion batteries, and the method comprises the steps: detecting whether a charging voltage value is smaller than a first preset threshold voltage value or not; if the charging voltage value is smaller than the first preset threshold voltage value, pre-charging the to-be-charged battery based on the first preset current until the charging voltage value reaches the first preset threshold voltage value, and controlling the to-be-charged battery to enter a constant-current charging stage; charging the to-be-charged battery based on a second preset current until the capacity value of the to-be-charged battery reaches a preset capacity threshold value, and entering a multi-stage constant-voltage charging stage; according to each charging voltage determined in the preset charging voltage range, performing stage charging on the to-be-charged battery until the charging voltage value reaches a second preset threshold voltage value, and controlling the to-be-charged battery to enter a final constant voltage charging stage; and when the charging current value is reduced to the charging current threshold value, charging is stopped. Through the provided scheme, the charging efficiency is improved, and the risk of battery damage is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a charging method, device, electronic device and storage medium. Background Art

[0002] With the booming development of the new energy vehicle industry driven mainly by lithium-ion batteries, electric vehicles have obvious disadvantages compared with fuel vehicles in terms of driving range and charging time.

[0003] At present, the traditional constant current constant voltage charging has become the commercial standard charging method for lithium-ion batteries. However, since the charging speed is mainly limited by the constant current stage, it is not possible to charge quickly, and the charging capacity is related to the current and cut-off voltage. If too large a current and cut-off voltage are used, it may cause overcharging, thereby accelerating the aging of the battery. Summary of the invention

[0004] In order to solve the above technical problems, the embodiments of the present application provide a charging method, a device, an electronic device and a storage medium.

[0005] In a first aspect, an embodiment of the present application provides a charging method, the method comprising:

[0006] Detecting whether the charging voltage value is less than a first preset threshold voltage value;

[0007] If the charging voltage value is less than the first preset threshold voltage value, the battery to be charged is pre-charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and the battery to be charged is controlled to enter a constant current charging stage;

[0008] Charging the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and controlling the battery to be charged to enter a multi-stage constant voltage charging stage;

[0009] Determine a plurality of charging voltages in a preset charging voltage range, and perform staged charging on the battery to be charged according to each of the charging voltages until the charging voltage value reaches a second preset threshold voltage value, and control the battery to be charged to enter a final constant voltage charging stage;

[0010] When the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging.

[0011] In one implementation, if the charging voltage value is greater than the first preset threshold voltage value, the battery to be charged is controlled to enter the constant current charging stage.

[0012] In one embodiment, the preset charging voltage range is divided into a plurality of charging stages, wherein one charging stage corresponds to one charging voltage;

[0013] The battery to be charged is charged according to the charging voltage corresponding to each charging stage.

[0014] In one embodiment, a corresponding cut-off current is set according to each charging stage;

[0015] The charging time of each charging stage is determined according to each cut-off current.

[0016] In one embodiment, a maximum charging voltage is determined in the preset charging voltage range, and constant voltage charging is performed on the battery to be charged according to the maximum charging voltage.

[0017] In one embodiment, a corresponding preset rest time is set according to the corresponding state of the battery to be charged at each stage;

[0018] Determining whether the standing time of the battery to be charged is greater than the preset standing time;

[0019] If the rest time of the battery to be charged is greater than the preset rest time, the battery to be charged is controlled to enter the next charging stage.

[0020] In one embodiment, obtaining a preset sampling time interval;

[0021] The sampling information of the battery to be charged is recorded according to the preset sampling time interval, wherein the sampling information includes: the charging voltage value and the charging current value.

[0022] In a second aspect, an embodiment of the present application provides a charging device, the charging device comprising:

[0023] A detection module, used to detect whether the charging voltage value is less than a first preset threshold voltage value;

[0024] a pre-charging module, configured to pre-charge the battery to be charged based on a first preset current if the charging voltage value is less than the first preset threshold voltage value, until the charging voltage value reaches the first preset threshold voltage value, and control the battery to be charged to enter a constant current charging stage;

[0025] A first control module, configured to charge the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and control the battery to be charged to enter a multi-stage constant voltage charging stage;

[0026] A second control module is used to determine a plurality of charging voltages within a preset charging voltage range, and to charge the battery to be charged in stages according to each of the charging voltages until the charging voltage value reaches a second preset threshold voltage value, thereby controlling the battery to be charged to enter a final constant voltage charging stage;

[0027] The stop module is used to control the battery to be charged to stop charging when the charging current value decreases to a charging current threshold.

[0028] In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and when the computer program is executed by the processor, the charging method provided in the first aspect is executed.

[0029] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which executes the charging method provided in the first aspect when running on a processor.

[0030] The charging method, device, electronic device and storage medium provided by the present application detect whether the charging voltage value is less than a first preset threshold voltage value; if the charging voltage value is less than the first preset threshold voltage value, the battery to be charged is pre-charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and the battery to be charged is controlled to enter a constant current charging stage; the battery to be charged is charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and the battery to be charged is controlled to enter a multi-stage constant voltage charging stage; multiple charging voltages are determined in a preset charging voltage range, and the battery to be charged is staged according to each charging voltage until the charging voltage value reaches a second preset threshold voltage value, and the battery to be charged is controlled to enter a final constant voltage charging stage; when the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging. By setting multiple charging stages to charge the battery to be charged, the charging process is optimized, the charging efficiency is improved, and the charging time is shortened, thereby ensuring the capacity utilization rate and battery cycle life of the battery to be charged. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0032] Figure 1 A schematic diagram of a charging method is shown;

[0033] Figure 2A cycle retention rate test diagram provided in an embodiment of the present application is shown;

[0034] Figure 3 A schematic diagram of the structure of a charging device provided in an embodiment of the present application is shown;

[0035] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown.

[0036] Icons: 300 - charging device, 301 - detection module, 302 - pre-charging module, 303 - first control module, 304 - second control module, 305 - stop module, 400 - electronic device, 401 - transceiver, 402 - processor, 403 - memory. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0038] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0039] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0040] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0041] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0042] Example 1

[0043] The present application embodiment provides a charging method. Figure 1 , charging methods include:

[0044] S101, detecting whether the charging voltage value is less than a first preset threshold voltage value.

[0045] In this embodiment, the operating voltage range of the ternary system battery used in this application is 2.5V-4.2V. The operating voltage ranges of different battery systems are different, and the first preset threshold voltage value can be adjusted according to the system.

[0046] Exemplarily, the first preset threshold voltage value is set to 2.5V, and the charging voltage is detected before charging. If the charging voltage value is lower than the threshold voltage 2.5V, the battery is pre-charged to 2.5V with a first preset current of 0.2C.

[0047] When the battery voltage is lower than the first preset threshold voltage value, it means that the battery may be in a deep discharge state or has not been used for a long time. At this time, it is necessary to pre-charge to the lower limit of the normal charging voltage of the battery to avoid the impact of direct high-current charging on the internal structure of the battery, resulting in battery damage. The pre-charging process can slowly restore the battery voltage and avoid the risks brought by direct high-current charging.

[0048] In one implementation, if the charging voltage value is greater than the first preset threshold voltage value, the battery to be charged is controlled to enter the constant current charging stage.

[0049] If the charging voltage value is greater than the first preset threshold voltage value, no pre-charging is required and the constant current charging stage can be directly entered.

[0050] S102, if the charging voltage value is less than the first preset threshold voltage value, pre-charge the battery to be charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and control the battery to be charged to enter a constant current charging stage.

[0051] S103, charging the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and controlling the battery to be charged to enter a multi-stage constant voltage charging stage.

[0052] It should be noted that after it is determined to enter the constant current charging stage, the battery to be charged is charged with the second preset current until the capacity value of the battery to be charged, ie, the percentage of the battery nominal capacity, reaches a preset capacity threshold.

[0053] Exemplarily, the battery to be charged is charged at a current value of 0.5C until the capacity value of the battery to be charged reaches 10% SOC (State of Charge, the remaining capacity of the battery).

[0054] It should be noted that the second preset current is generally not greater than the standard charging current of the battery, and the value can be changed according to the need of charging time. The formula for calculating the charging current is: charging current (A) = charging capacity (Ah) / charging time (h).

[0055] It is further explained that the SOC value is defined as the ratio of the remaining capacity to the battery capacity, usually expressed as a percentage, with a value range of 0% to 100%.

[0056] The internal resistance of the battery charging process is relatively large in the 0%-10% SOC range, so charging with the second preset current first can reduce battery polarization and extend the battery life. The preset capacity threshold, i.e., the threshold SOC, can be adjusted according to demand. S104, determining multiple charging voltages in the preset charging voltage range, and charging the battery to be charged in stages according to each of the charging voltages until the charging voltage value reaches the second preset threshold voltage value, and controlling the battery to be charged to enter the final constant voltage charging stage.

[0057] In this embodiment, the charging voltage changes from small to large, with the rate current as the cutoff, and the cutoff current changes from large to small. The charging speed is fast in this stage, and the battery capacity will be charged to more than 80% of the SOC in a short time.

[0058] In one embodiment, the preset charging voltage range is divided into a plurality of charging stages, wherein one charging stage corresponds to one charging voltage; and the battery to be charged is charged according to the charging voltage corresponding to each charging stage.

[0059] It should be understood that when the voltage step is converted, the current will jump from the cut-off current of the previous step to the initial current of the next step. The current change can be calculated based on the voltage change at this time and the ohmic internal resistance of the battery at this time. The ohmic internal resistance of the battery can be obtained by tests such as DCR (Direct Current Resistance). This calculation can determine the maximum value of the next current when the voltage step changes, and control the current so that it is not too large and exceeds the battery's tolerance limit, causing battery damage and loss of life. In this way, the voltage step change value is controlled within a certain range.

[0060] It is further understood that the charging voltage range is 2.5V to 4.2V, and in the multi-stage constant voltage charging stage, each stage corresponds to a battery voltage, and the voltage changes stepwise from small to large according to the set value until the charging voltage reaches 4.2V and is cut off. In one embodiment, a corresponding cutoff current is set according to each of the charging stages; and the charging time of each of the charging stages is determined according to each of the cutoff currents.

[0061] It should be noted that the cut-off current can be adjusted according to the required charging time. Generally, the lower the cut-off current, the longer the required charging time. When the current is getting smaller, it takes longer to charge to the same SOC. The smaller the cut-off current, the less polarization of the battery charging process can be reduced, and the battery life can be increased.

[0062] In one embodiment, a maximum charging voltage is determined in the preset charging voltage range, and constant voltage charging is performed on the battery to be charged according to the maximum charging voltage.

[0063] In other embodiments, the last stage charging voltage is determined based on the required charging time and the charged SOC. If fast charging is not required to charge a large amount of electricity, the last stage voltage may not be as high as 4.2V, and the 4.2V constant voltage charging can be classified as the third stage until the battery is fully charged.

[0064] S105, when the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging.

[0065] It should be understood that the purpose of this stage is to fully charge the battery and achieve the purpose of depolarization. When setting the charging current threshold, it is necessary to weigh the energy output and the problem of long constant voltage time caused by increasing polarization during the cycle. A lower charging current threshold can allow the battery to release more energy, but it may also cause the constant voltage period to be too long in the later stage of the cycle and fall short of the cut-off current threshold. Therefore, it is necessary to set an appropriate current threshold according to the system.

[0066] In one embodiment, a corresponding preset standing time is set according to the corresponding state of the battery to be charged in each stage; it is determined whether the standing time of the battery to be charged is greater than the preset standing time; if the standing time of the battery to be charged is greater than the preset standing time, the battery to be charged is controlled to enter the next charging stage.

[0067] Exemplarily, the present application tests the lithium-ion battery according to the test steps recorded in Table 1.

[0068] Specifically, step 2 is a constant current charging stage, using a 0.5C small current constant current charging for 12 minutes to 10% SOC, followed by multi-stage constant voltage charging, steps 3, 4 and 5 are multi-stage constant voltage charging stages, the first stage constant voltage charging stage of step 3 is 3.8V, constant voltage charging to the first cut-off current reaches 4C, takes 21S, and charges 2.73% SOC; thus entering step 4, step 4 is the second stage constant voltage charging stage, its charging voltage value is 4.0V, constant voltage charging to the second cut-off current 3C, takes 4min30S, and charges 33.13% SOC; thus entering step 5, step 5 is the third stage constant voltage charging stage, its charging voltage value is 4.2V, constant voltage charging to the third cut-off current 1.5C, takes 6min50S, and charges 35.79% SOC.

[0069] Finally, it enters the constant voltage charging stage, using 4.2V constant voltage charging to the charging current threshold of 0.05C, so that the lithium battery can be charged with as much electricity as possible under a smaller charging current condition, and the charging current gradually decreases to reduce the polarization phenomenon inside the battery, that is, reduce the overpotential at both ends of the DC internal resistance, and increase the life of the lithium battery.

[0070] Table 1 Lithium-ion battery test steps

[0071] Step number Steps Deadline Picking Point 1 Stand 10min 10S 2 Constant current 0.5C charging 12min 2S 3 Constant voltage 3.8V charging 4C 2S 4 Constant voltage 4.0V charging 3C 2S 5 Constant voltage 4.2V charging 1.5C 2S 6 Constant voltage 4.2V charging 0.05C cut-off 10S 7 Stand 10min 10S 8 Constant current 1C discharge 2.75V 10S 9 Stand 10min 10S

[0072] It should be noted that the battery tested in this embodiment is a 21700 cylindrical battery with a nominal capacity of 5200 mAh, and the total charging time is 11.68 minutes, and the total charging is 71.65% SOC, achieving the ultimate charging speed of 10%-80% SOC within 12 minutes.

[0073] At the same time, on the basis of ensuring the charging efficiency of the battery, the cycle performance of the battery charged using this solution was further tested, such as Figure 2 As shown, it can be seen that this solution can still ensure 80% capacity retention rate after 800 fast charging cycles. In other words, this solution makes the rechargeable battery have extremely high cycle stability, which means that during long-term use of the battery, its performance decays slowly, reducing the impact on battery life, thereby extending the overall service life of the battery.

[0074] In one embodiment, a preset sampling time interval is obtained; and sampling information of the battery to be charged is recorded according to the preset sampling time interval, wherein the sampling information includes: the charging voltage value and the charging current value.

[0075] It should be noted that the sampling time interval is set according to the data processing needs, and the sampling information includes but is not limited to voltage and current values, equipment, software collection, as well as capacity, temperature, time, etc.

[0076] The charging method provided in this embodiment detects whether the charging voltage value is less than a first preset threshold voltage value; if the charging voltage value is less than the first preset threshold voltage value, the battery to be charged is pre-charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and the battery to be charged is controlled to enter a constant current charging stage; the battery to be charged is charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and the battery to be charged is controlled to enter a multi-stage constant voltage charging stage; multiple charging voltages are determined within a preset charging voltage range, and the battery to be charged is staged according to each charging voltage until the charging voltage value reaches a second preset threshold voltage value, and the battery to be charged is controlled to enter a final constant voltage charging stage; when the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging. By setting multiple charging stages to charge the battery to be charged, the charging process is optimized, the charging efficiency is improved, and the charging time is shortened, thereby ensuring the capacity utilization rate and battery cycle life of the battery to be charged.

[0077] Example 2

[0078] In addition, an embodiment of the present application provides a charging device.

[0079] like Figure 3 As shown, the charging device 300 includes:

[0080] The detection module 301 is used to detect whether the charging voltage value is less than a first preset threshold voltage value;

[0081] A pre-charging module 302 is configured to pre-charge the battery to be charged based on a first preset current if the charging voltage value is less than the first preset threshold voltage value, until the charging voltage value reaches the first preset threshold voltage value, and control the battery to be charged to enter a constant current charging stage;

[0082] The first control module 303 is used to charge the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and control the battery to be charged to enter a multi-stage constant voltage charging stage;

[0083] The second control module 304 is used to determine a plurality of charging voltages in a preset charging voltage range, and to perform staged charging on the battery to be charged according to each of the charging voltages until the charging voltage value reaches a second preset threshold voltage value, thereby controlling the battery to be charged to enter a final constant voltage charging stage;

[0084] The stop module 305 is used to control the battery to be charged to stop charging when the charging current value decreases to a charging current threshold.

[0085] The charging device 300 provided in this embodiment can implement the charging method provided in Embodiment 1, and will not be described again here to avoid repetition.

[0086] The charging device provided in this embodiment detects whether the charging voltage value is less than a first preset threshold voltage value; if the charging voltage value is less than the first preset threshold voltage value, the battery to be charged is pre-charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and the battery to be charged is controlled to enter a constant current charging stage; the battery to be charged is charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and the battery to be charged is controlled to enter a multi-stage constant voltage charging stage; multiple charging voltages are determined within a preset charging voltage range, and the battery to be charged is staged according to each charging voltage until the charging voltage value reaches a second preset threshold voltage value, and the battery to be charged is controlled to enter a final constant voltage charging stage; when the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging. By setting multiple charging stages to charge the battery to be charged, the charging process is optimized, the charging efficiency is improved, and the charging time is shortened, thereby ensuring the capacity utilization rate and battery cycle life of the battery to be charged.

[0087] Example 3

[0088] In addition, an embodiment of the present application 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 Embodiment 4 is executed.

[0089] For details, see Figure 4 The electronic device 400 includes: a transceiver 401, a bus interface and a processor 402, wherein the processor 402 is used to: detect whether the charging voltage value is less than a first preset threshold voltage value; if the charging voltage value is less than the first preset threshold voltage value, pre-charge the battery to be charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and control the battery to be charged to enter a constant current charging stage; charge the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and control the battery to be charged to enter a multi-stage constant voltage charging stage; determine multiple charging voltages within a preset charging voltage range, and charge the battery to be charged in stages according to each charging voltage until the charging voltage value reaches the second preset threshold voltage value, and control the battery to be charged to enter a final constant voltage charging stage; when the charging current value decreases to the charging current threshold, control the battery to be charged to stop charging.

[0090] In one implementation, the processor 402 is further configured to: if the charging voltage value is greater than the first preset threshold voltage value, control the battery to be charged to enter the constant current charging stage.

[0091] In one embodiment, the processor 402 is further used to: divide the preset charging voltage range into multiple charging stages, wherein one charging stage corresponds to one charging voltage; and charge the battery to be charged according to the charging voltage corresponding to each charging stage.

[0092] In one implementation, the processor 402 is further configured to: set a corresponding cut-off current according to each charging stage; and determine a charging time of each charging stage according to each cut-off current.

[0093] In one embodiment, the processor 402 is further configured to: determine a maximum charging voltage in the preset charging voltage range, and perform constant voltage charging on the battery to be charged according to the maximum charging voltage.

[0094] In one embodiment, the processor 402 is further used to: set a corresponding preset standing time according to the corresponding state of the battery to be charged in each stage; determine whether the standing time of the battery to be charged is greater than the preset standing time; if the standing time of the battery to be charged is greater than the preset standing time, control the battery to be charged to enter the next charging stage.

[0095] In one embodiment, the processor 402 is further configured to: obtain a preset sampling time interval; and record sampling information of the battery to be charged according to the preset sampling time interval, wherein the sampling information includes: the charging voltage value and the charging current value.

[0096] In the embodiment of the present application, the electronic device 400 further includes a memory 403. Figure 4 In 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 402 and memory represented by memory 403. 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 401 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 402 is responsible for managing the bus architecture and general processing, and the memory 403 may store data used by the processor 402 when performing operations.

[0097] The electronic device 400 provided in the embodiment of the present application can execute the steps of the charging method provided in the above method embodiment 1, which will not be described again here to avoid repetition.

[0098] The electronic device provided in this embodiment detects whether the charging voltage value is less than a first preset threshold voltage value; if the charging voltage value is less than the first preset threshold voltage value, the battery to be charged is pre-charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and the battery to be charged is controlled to enter a constant current charging stage; the battery to be charged is charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and the battery to be charged is controlled to enter a multi-stage constant voltage charging stage; multiple charging voltages are determined within a preset charging voltage range, and the battery to be charged is staged according to each charging voltage until the charging voltage value reaches a second preset threshold voltage value, and the battery to be charged is controlled to enter a final constant voltage charging stage; when the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging. By setting multiple charging stages to charge the battery to be charged, the charging process is optimized, the charging efficiency is improved, and the charging time is shortened, thereby ensuring the capacity utilization rate and battery cycle life of the battery to be charged.

[0099] Example 4

[0100] The present application also 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 Example 1 is implemented.

[0101] 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.

[0102] 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.

[0103] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or terminal including the element.

[0104] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0105] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A charging method, characterized in that: The method comprises: Detecting whether the charging voltage value is less than a first preset threshold voltage value; If the charging voltage value is less than the first preset threshold voltage value, the battery to be charged is pre-charged based on a first preset current until the charging voltage value reaches the first preset threshold voltage value, and the battery to be charged is controlled to enter a constant current charging stage; Charging the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and controlling the battery to be charged to enter a multi-stage constant voltage charging stage; Determine a plurality of charging voltages in a preset charging voltage range, and perform staged charging on the battery to be charged according to each of the charging voltages until the charging voltage value reaches a second preset threshold voltage value, and control the battery to be charged to enter a final constant voltage charging stage; When the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging.

2. The charging method according to claim 1, characterized in that: After detecting whether the charging voltage value is less than the first preset threshold voltage value, the method further includes: If the charging voltage value is greater than the first preset threshold voltage value, the battery to be charged is controlled to enter the constant current charging stage.

3. The charging method according to claim 1, characterized in that: The step of determining a plurality of charging voltages within a preset charging voltage range and performing staged charging on the battery to be charged according to each of the charging voltages comprises: Dividing the preset charging voltage range into a plurality of charging stages, wherein one charging stage corresponds to one charging voltage; The battery to be charged is charged according to the charging voltage corresponding to each charging stage.

4. The charging method according to claim 3, characterized in that: After dividing the preset charging voltage range into a plurality of charging stages, the method further includes: Setting a corresponding cut-off current according to each charging stage; The charging time of each charging stage is determined according to each cut-off current.

5. The charging method according to claim 1, characterized in that: When the charging current value decreases to the charging current threshold, the battery to be charged is controlled to stop charging, comprising: A maximum charging voltage is determined in the preset charging voltage range, and constant voltage charging is performed on the battery to be charged according to the maximum charging voltage.

6. The charging method according to claim 1, characterized in that: The method further comprises: Setting a corresponding preset rest time according to the corresponding state of the battery to be charged at each stage; Determining whether the standing time of the battery to be charged is greater than the preset standing time; If the rest time of the battery to be charged is greater than the preset rest time, the battery to be charged is controlled to enter the next charging stage.

7. The charging method according to claim 1, characterized in that: The method further comprises: Get the preset sampling time interval; The sampling information of the battery to be charged is recorded according to the preset sampling time interval, wherein the sampling information includes: the charging voltage value and the charging current value.

8. A charging device, characterized in that: The device comprises: A detection module, used to detect whether the charging voltage value is less than a first preset threshold voltage value; a pre-charging module, configured to pre-charge the battery to be charged based on a first preset current if the charging voltage value is less than the first preset threshold voltage value, until the charging voltage value reaches the first preset threshold voltage value, and control the battery to be charged to enter a constant current charging stage; A first control module, configured to charge the battery to be charged based on a second preset current until the capacity value of the battery to be charged reaches a preset capacity threshold, and control the battery to be charged to enter a multi-stage constant voltage charging stage; A second control module is used to determine a plurality of charging voltages within a preset charging voltage range, and to charge the battery to be charged in stages according to each of the charging voltages until the charging voltage value reaches a second preset threshold voltage value, thereby controlling the battery to be charged to enter a final constant voltage charging stage; The stop module is used to control the battery to be charged to stop charging when the charging current value decreases to a charging current threshold.

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 executed by 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 device stores a computer program, which executes the charging method according to any one of claims 1 to 7 when running on a processor.

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