Charging method, device, equipment, storage medium and computer program product

Abstract

The invention relates to a charging method and device, equipment, a storage medium and a computer program product. The method comprises the steps that in the battery charging process, a preset discharging strategy is adopted to discharge a battery for multiple times till the battery is charged to the preset charge quantity, and the discharging strategy comprises the corresponding relation between multiple charge quantities and discharging parameters. According to the charging method, the battery is discharged at intervals of different charging charges by utilizing the discharging parameters, namely, a scheme of continuously applying discharging pulses in a multi-time charging process is realized, and the lithium precipitation appearance of the surface of the negative electrode of the battery can be regulated and controlled to a certain extent, so that the lithium precipitation appearance of the surface of the negative electrode of the battery becomes uniform, and the lithium precipitation effect of the surface of the negative electrode of the battery is improved. Therefore, the lithium precipitation phenomenon on the battery surface is reduced. In addition, rapid depolarization of the battery can be realized, the anode potential is continuously improved in the charging process, and the risk of lithium precipitation can be reduced to a certain extent.

Description

Technical Field

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

[0002] With the widespread application of lithium-ion batteries in new energy vehicles, energy storage and other fields, people's demand for battery charging speed is getting higher and higher. However, for battery packs using fast charging processes, when the battery pack ages to a certain stage, lithium deposition and short circuits are likely to occur on the negative electrode surface of the battery, affecting the safe use of the battery pack.

[0003] Therefore, for batteries with the risk of lithium plating, how to reduce the lithium plating of the batteries has become a technical problem that needs to be solved urgently in the field of battery charging. Summary of the invention

[0004] Based on this, it is necessary to provide a charging method, device, equipment, storage medium and computer program product that can reduce the lithium plating phenomenon of the battery in response to the above technical problems.

[0005] In a first aspect, the present application provides a charging method. The method comprises:

[0006] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0007] The charging method described in the embodiment of the present application, during the process of charging the battery, uses a preset discharge strategy to discharge the battery multiple times until the battery is charged to a preset charge amount, wherein the discharge strategy includes a correspondence between multiple charge amounts and discharge parameters. The charging method realizes discharging the battery using discharge parameters at intervals of different charging charge amounts, that is, it realizes a scheme of applying discharge pulses uninterruptedly during multiple charging processes, which can regulate the lithium deposition appearance of the negative electrode surface of the battery to a certain extent, so that the lithium deposition appearance of the negative electrode surface of the battery becomes uniform, thereby reducing the lithium deposition phenomenon on the battery surface. In addition, rapid depolarization of the battery can be achieved, and the anode potential can be continuously increased during the charging process, which can reduce the risk of lithium deposition to a certain extent.

[0008] In one embodiment, the discharge parameter includes a first magnification and a first discharge duration, and during the process of charging the battery, the battery is discharged multiple times using a preset discharge strategy, including:

[0009] During the charging process of the battery, after charging the battery with a first charge amount each time, the preset discharge strategy is adopted to discharge the battery with a current of a first amplification factor for a first discharge duration.

[0010] The charging method described in the embodiment of the present application realizes a scheme of applying discharge pulses continuously during multiple charging processes, which can regulate the lithium deposition morphology of the negative electrode surface of the battery to a certain extent, making the lithium deposition morphology of the negative electrode surface of the battery uniform, thereby reducing the lithium deposition phenomenon on the battery surface.

[0011] In one embodiment, the method further comprises:

[0012] In the first charging stage of the battery, after the battery is charged to a second charge amount according to the preset charging strategy, the battery is discharged for a second time period using a current with a second amplification factor;

[0013] In the process of charging the battery, after charging the battery with a first charge amount each time, the preset discharge strategy is used to discharge the battery with a current of a first magnification ratio for a first discharge duration, including:

[0014] In the second charging stage of the battery, the preset discharge strategy is adopted to discharge the battery for a first discharge time using a current of a first magnification after each charging of the battery with a first charge amount;

[0015] Wherein, the second magnification is greater than the first magnification.

[0016] The charging method described in the embodiment of the present application is divided into two charging stages to charge the battery, and when comparing the discharge operations in the first charging stage and the second charging stage, the second magnification used in the first charging stage is greater than the first magnification used in the second charging stage. Such a design has a more prominent effect on improving lithium deposition on the battery surface.

[0017] In one embodiment, after the battery is charged to a second charge amount according to the preset charging strategy, discharging the battery for a second time period using a current with a second amplification factor includes:

[0018] Using a current having a third amplification factor, charging the battery to the second charge amount;

[0019] The charged battery is discharged for a second time period using the current of the second amplification factor; the second amplification factor is greater than the third amplification factor.

[0020] The charging method described in the embodiment of the present application charges the battery with a second charge before discharging the battery, so that the discharge operation can regulate the dendrite lithium deposition surface of the battery, thereby reducing the lithium deposition of the battery.

[0021] In one embodiment, charging the battery to the second charge amount using a current having a third magnification includes:

[0022] Using the current of the third amplification factor, charging the battery to a third charge amount;

[0023] The charged battery is charged to the second charge amount using a current of a fourth magnification; the fourth magnification is smaller than the third magnification; and the second charge amount is larger than the third charge amount.

[0024] The charging method described in the embodiment of the present application charges the battery with a second charge before discharging the battery. Specifically, the battery can be charged multiple times using currents with different amplification factors, and then a discharge operation is performed on the charged battery, so that the discharge operation can regulate the dendrite lithium deposition surface of the battery, thereby reducing the lithium deposition of the battery.

[0025] In one embodiment, the method further comprises:

[0026] The battery is charged for a first number of cycles according to a first charging strategy to obtain a charged battery: the first charging strategy includes charging the battery with interval charge amounts according to currents with different magnifications until the battery is charged to the preset charge amount;

[0027] Correspondingly, during the process of charging the battery, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the discharge strategy includes a correspondence between multiple charge amounts and discharge parameters, including:

[0028] The second cycle number is used as the cycle cutoff condition, and the cycle executes the steps: in the process of charging the battery, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount.

[0029] The charging method described in the embodiment of the present application can simulate the scenario in which lithium deposition occurs on the surface of the battery after the battery has been actually used for a period of time by cyclically charging the battery and then cyclically charging and discharging the battery. That is, by adopting a preset discharge strategy to charge and discharge the battery in which lithium deposition has occurred, the appearance of lithium deposition on the battery surface can be regulated, so that the lithium deposition on the battery surface is evenly distributed, reducing the risk of the lithium deposition tip piercing the battery diaphragm, thereby achieving the effect of reducing lithium deposition in the battery.

[0030] In one embodiment, the method further comprises:

[0031] Applying currents with different test parameters to the target battery for discharge, and measuring the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site;

[0032] The discharge parameter is determined according to the lithium deposition current density corresponding to each of the test parameters and a preset lithium deposition current density threshold.

[0033] The method described in the embodiments of the present application can obtain the best discharge parameters through experimental measurement, and then discharge the battery according to the best discharge parameters to achieve the best lithium deposition appearance improvement effect, thereby reducing lithium deposition on the battery surface.

[0034] In one embodiment, the test parameters include a test discharge duration and a plurality of different test magnifications, the preset lithium deposition current density threshold includes a first lithium deposition current density threshold, and the currents with different test parameters are applied to the target battery for discharge, and the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site is measured, including:

[0035] Applying the test discharge duration and the current of the different test magnifications to the target battery for discharge, and measuring the lithium deposition current density corresponding to each of the magnifications at the lithium deposition site;

[0036] The step of determining the discharge parameter according to the lithium deposition current density corresponding to each of the test parameters and a preset lithium deposition current density threshold comprises:

[0037] The first magnification is determined according to the lithium deposition current density corresponding to each of the magnifications and the first lithium deposition current density threshold.

[0038] The embodiment of the present application determines the optimal magnification by obtaining the correlation between different magnifications and lithium plating current density, thereby determining that a large-rate pulse current is used for uninterrupted discharge during the battery charging process, which can achieve lithium cutting at the tip of the dendrite lithium plating, that is, it can enhance the improvement effect of lithium plating to a certain extent, thereby reducing lithium plating on the battery surface.

[0039] In one embodiment, the test parameters include a test magnification and a plurality of different test discharge durations, the preset lithium deposition current density threshold includes a second lithium deposition current density threshold, and the currents with different test parameters are applied to the target battery for discharge, and the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site is measured, including:

[0040] Applying the current of the test magnification and the different test discharge durations to the target battery for discharge, and measuring the lithium deposition current density corresponding to each of the test discharge durations at the lithium deposition site;

[0041] The first discharge duration is determined according to the lithium deposition current density corresponding to each of the test discharge durations and the second lithium deposition current density threshold.

[0042] The embodiment of the present application determines the optimal test discharge time by obtaining the correlation between different test discharge times and lithium plating current density, thereby determining that a pulse current with the optimal test discharge time is used for uninterrupted discharge during the battery charging process, which can achieve lithium cutting at the tip of dendrite lithium plating, that is, it can enhance the improvement effect of lithium plating to a certain extent, thereby reducing lithium plating on the battery surface.

[0043] In a second aspect, the present application also provides a charging device. The device comprises:

[0044] The charging module is used to discharge the battery multiple times using a preset discharge strategy during the battery charging process until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0045] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0046] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0047] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0048] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0049] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0050] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0051] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0053] Figure 1 is a schematic structural diagram of a charging system in one embodiment;

[0054] Figure 2 is a schematic flow chart of a charging method in one embodiment;

[0055] Figure 3 is a schematic flow chart of a charging method in another embodiment;

[0056] Figure 4 is a schematic flow chart of a charging method in another embodiment;

[0057] Figure 5 is a schematic flow chart of a charging method in another embodiment;

[0058] Figure 6 A schematic diagram of a test effect in one embodiment;

[0059] Figure 7 is a schematic flow chart of a charging method in another embodiment;

[0060] Figure 8 is a schematic flow chart of a charging method in another embodiment;

[0061] Fig. 9 A schematic diagram of the correlation between the magnification and the lithium deposition current density in one embodiment;

[0062] Fig.10 is a schematic flow chart of a charging method in another embodiment;

[0063] Fig.11 A schematic diagram of the correlation between discharge time and lithium deposition current density in one embodiment;

[0064] Fig.12 is a schematic diagram of a charging process in one embodiment;

[0065] Fig.13is a schematic diagram of a charging process in another embodiment;

[0066] Fig.14 is a structural block diagram of a charging device in one embodiment;

[0067] Fig.15 is a structural block diagram of a charging device in another embodiment;

[0068] Fig.16 is a structural block diagram of a charging device in another embodiment;

[0069] Fig.17 is a structural block diagram of a charging device in another embodiment;

[0070] Fig.18 is a structural block diagram of a charging device in another embodiment;

[0071] Fig.19 is a structural block diagram of a charging device in another embodiment;

[0072] Fig. 20 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0075] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0076] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0077] When the battery is charged using the fast charging process, when the battery ages to a certain stage, lithium deposition is very likely to occur on the negative electrode surface of the battery, and as the amount of lithium deposition increases, the tip of the dendrite will pierce the battery separator, causing a short circuit of lithium deposition, thereby damaging the battery or shortening the battery life; in addition, the current charging method for reducing lithium deposition is generally to adjust the current parameters of the charging pulse according to the negative electrode potential and battery voltage of the three-electrode battery, so as to maximize the charging capacity within a safe range without the side reaction of lithium deposition, thereby reducing the lithium deposition phenomenon to a certain extent, but the effect of reducing lithium deposition by this method is not good. In response to this problem, the embodiment of the present application provides a charging method, and the following embodiment will specifically illustrate the charging method described in the embodiment of the present application.

[0078] The charging method provided in the embodiment of the present application can be applied to Figure 1 In the charging system shown in FIG. 1 , a charging device 102 is connected to a battery 104. The charging device 102 can determine a charging strategy and charge the battery 104 according to the charging strategy. The charging device 102 can be, but is not limited to, various rechargeable devices such as personal computers, laptops, smart phones, tablet computers, servers, charging piles, etc. The battery 104 can be any type of battery, such as a secondary battery and a tertiary battery, etc. The battery 104 can be specifically a lithium-ion battery.

[0079] In one embodiment, Figure 2 As shown, a charging method is provided, which is applied to Figure 1 The charging device in the example is used to illustrate, including the following steps:

[0080] S201, during the battery charging process, discharging the battery multiple times using a preset discharge strategy until the battery is charged to a preset charge amount, wherein the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0081] Among them, the discharge parameters include amplification and discharge duration, the amplification indicates the magnification of the pulse current, and the discharge duration indicates the duration of the pulse current discharge. The correspondence between multiple charge amounts and discharge parameters indicates that when the battery is charged to each charge amount, the corresponding discharge parameters are used to discharge the battery. Different charge amounts correspond to different discharge parameters, for example, different charge amounts correspond to different amplifications and the same discharge duration, or different charge amounts correspond to the same amplifications and different discharge durations, or different charge amounts correspond to different amplifications and different discharge durations. The preset charge amount is the target charge amount for full charge, which can be determined according to the actual charging demand. For example, the preset charge amount can be 90%, 95%, 96% of the charge state (State of Charge, SOC), etc. The above-mentioned magnification is a relatively large magnification. Optionally, the magnification can be a magnification of not less than 1.5C; optionally, the value range of the first magnification is 2C to 3C; the above-mentioned discharge duration is a relatively long duration. Optionally, the discharge duration can be a duration of not less than 6s; optionally, the value range of the first discharge duration is 8s to 15s.

[0082] In an embodiment of the present application, the charging device may predetermine a charging strategy, which includes a correspondence between multiple charging charges and charging currents, that is, the battery is charged multiple times using different charging currents or the same charging current until the battery reaches a preset charge. The charging device may also predetermine a preset discharge strategy, which includes a correspondence between multiple charge amounts and discharge parameters, that is, the battery is discharged multiple times during multiple charging processes of the battery using different charging parameters or the same charging parameters, and the battery is charged to the preset charge amount, that is, the charging is completed. For example, after the battery is charged to 40% using the first charging current, the battery is discharged using the first discharge parameter; after the battery is charged to 60% using the second charging current, the battery is discharged using the second discharge parameter; after the battery is charged to 80% using the third charging current, the battery is discharged using the third discharge parameter; and the battery is charged to 100% using the fourth charging current to complete the charging. The first charging current, the second charging current and the third charging current in the above example can be determined according to actual charging requirements, and the first charging current, the second charging current and the third charging current can be the same or different; the first discharge parameter, the second discharge parameter and the third discharge parameter can be determined according to actual discharge requirements, and the first discharge parameter, the second discharge parameter and the third discharge parameter can be the same or different.

[0083] The charging method described in the embodiment of the present application, during the process of charging the battery, uses a preset discharge strategy to discharge the battery multiple times until the battery is charged to a preset charge amount, wherein the discharge strategy includes a correspondence between multiple charge amounts and discharge parameters. The charging method realizes discharging the battery using discharge parameters at intervals of different charging charge amounts, that is, it realizes a scheme of applying discharge pulses uninterruptedly during multiple charging processes, which can regulate the lithium deposition appearance of the negative electrode surface of the battery to a certain extent, so that the lithium deposition appearance of the negative electrode surface of the battery becomes uniform, thereby reducing the lithium deposition phenomenon on the battery surface. In addition, rapid depolarization of the battery can be achieved, and the anode potential can be continuously increased during the charging process, which can reduce the risk of lithium deposition to a certain extent.

[0084] In one embodiment, when the charging device executes the step S201 of "discharging the battery multiple times using a preset discharge strategy during the battery charging process", the specific execution steps are: during the battery charging process, after charging the battery with a first charge amount each time, the preset discharge strategy is adopted to discharge the battery for a first discharge time using a current with a first amplification factor.

[0085] Among them, the first charge amount can be determined according to the actual discharge demand, for example, the first charge amount can be an SOC of 1%, 5%, 10%, 15%, 20%, etc. The value of the first magnification can be determined according to the actual discharge demand, for example, the value of the first magnification can be one of 2 times magnification, 2.5 times magnification, 2.8 times magnification, 2.9 times magnification, etc. Optimally, the value range of the first magnification is 2C to 3C, or the value of the first magnification is not less than 1.5C. The first discharge duration can be determined according to the actual discharge demand, for example, the value range of the first discharge duration is 8s to 15s, or the value of the first discharge duration is not less than 6s.

[0086] The embodiment of the present application relates to a method for charging a battery, that is, after each charging of the battery to a first charge amount, the battery can be discharged for a first discharge time using a current of a first magnification until the battery is charged to a preset charge amount, and the charging is completed. For example, when the battery is charged to 20% of the SOC at each interval, a 3C current is applied to the battery for 10s for discharge, until the battery is charged to 96% of the preset charge amount, and the charging is completed.

[0087] The charging method described in the embodiment of the present application realizes a scheme of applying discharge pulses continuously during multiple charging processes, which can regulate the lithium deposition morphology of the negative electrode surface of the battery to a certain extent, making the lithium deposition morphology of the negative electrode surface of the battery uniform, thereby reducing the lithium deposition phenomenon on the battery surface.

[0088] In one embodiment, the charging stage includes a first charging stage and a second charging stage. Based on this, the charging method in the above embodiment also includes: in the first charging stage of the battery, after the battery is charged to a second charge amount according to a preset charging strategy, the battery is discharged for a second period of time using a current with a second amplification factor.

[0089] Among them, the second charge amount can be determined according to the actual discharge demand, for example, the second charge amount can be 20%, 30%, 40%, 50%, 60% SOC, etc. The value of the second magnification can be determined according to the actual discharge demand, for example, the value of the second magnification can be one of 2 times magnification, 2.5 times magnification, 2.8 times magnification, 2.9 times magnification, etc. Optimally, the value range of the second magnification is 2C to 3C. The second duration can be determined according to the actual discharge demand, for example, the value range of the second duration is 8s to 15s. The first charging stage refers to charging the battery to a first preset charging charge (i.e., the second charge in this embodiment), and the second charging stage refers to charging the battery to a second preset charging charge, the first preset charging charge is less than the second preset charging charge, for example, charging the battery to 65% SOC is the first charging stage, and then charging the battery from 65% SOC to 96% SOC is the second charging stage.

[0090] The embodiment of the present application relates to the first charging stage of charging the battery, that is, the battery is first charged, and after charging to a second charge amount, the charging device can use a second amplification factor current to discharge the battery for a second time until the charging of the first stage is completed. For example, when the battery reaches 65% SOC, a 3C current is applied to the battery for 10s to discharge, and the first stage of charging is completed; or, after applying a 3C current to the battery for 10s to discharge, and then charging the battery to 85% SOC, a 3C current is applied to the battery for 10s to discharge, and the first stage of charging charge is completed. Until it is charged to a preset charge amount of 96%, the charging is completed; or, after applying a 3C current to the battery for 10s to discharge, each time the preset charge amount (for example, 5%) is charged, a 3C current is applied to the battery for 10s to discharge, until the first stage of charging is completed, and the charge amount to be achieved in the first stage of charging can be determined according to the actual charging demand.

[0091] Correspondingly, when the charging device executes the step of "in the process of charging the battery, after charging the battery with a first charge amount each time, using a preset discharge strategy to discharge the battery with a current of a first amplification factor for a first discharge duration", the specific execution steps are:

[0092] In the second charging stage of the battery, after charging the battery with the first charge amount each time, the battery is discharged for the first discharge duration using a current of the first magnification ratio using a preset discharge strategy; wherein the second magnification ratio is greater than the first magnification ratio, for example, the second magnification ratio is 3C and the first magnification ratio is 2.5C. The first discharge duration and the second duration may be the same or different.

[0093] The embodiment of the present application relates to a second charging stage of charging a battery, that is, after the first charging stage is completed, the charging device can first charge the battery, and after charging to a first charge amount, the charging device can use a first amplification factor current to discharge the battery for a first discharge duration until the second stage of charging is completed. For example, the first charging stage is completed when the battery reaches 40% SOC, and the battery is continued to be charged. After the battery is charged to 65% SOC, a 2.5C current is applied to the battery for 10s to discharge, and then each time a preset charge amount (for example, 5%) is charged, a 2.5C current is applied to the battery for 10s to discharge until the second stage of charging is completed.

[0094] The charging method described in the embodiment of the present application is divided into two charging stages to charge the battery, and when comparing the discharge operations in the first charging stage and the second charging stage, the second magnification used in the first charging stage is greater than the first magnification used in the second charging stage. Such a design has a more prominent effect on improving lithium deposition on the battery surface.

[0095] In one embodiment, a method for charging a battery to a second charge amount is provided, that is, Figure 3 As shown, the above step of "in the first charging stage of the battery, after the battery is charged to a second charge amount according to a preset charging strategy, discharging the battery for a second time using a current with a second amplification factor" includes:

[0096] S301 , using a current with a third amplification factor to charge the battery to a second charge amount.

[0097] The second magnification is greater than the third magnification. The third magnification may be 1.6C, 1C, 0.7C, etc. The second charge may be 40% SOC, 65% SOC, etc.

[0098] In the embodiment of the present application, the preset charging strategy may include charging the battery with a current of a third magnification, that is, charging the battery with a current of a third magnification and charging it to a second charge amount. For example, charging the battery with a current of a magnification of 1.6C and charging the battery to a SOC of 65%.

[0099] S302, using a current with a second amplification factor to discharge the charged battery for a second time period.

[0100] In an embodiment of the present application, when the preset charging strategy described in S301 is used to charge the battery so that the charged battery reaches a second charge amount, a preset discharging strategy can be used to discharge the battery that has reached the second charge amount, that is, a current with a second amplification factor is used to discharge the charged battery for a second period of time until the first stage of charging is completed.

[0101] The charging method described in the embodiment of the present application charges the battery with a second charge before discharging the battery, so that the discharge operation can regulate the dendrite lithium deposition surface of the battery, thereby reducing the lithium deposition of the battery.

[0102] In one embodiment, another implementation method for charging the battery to a second charge amount is provided, that is, Figure 4 As shown, the above step S301 "using the current of the third magnification to charge the battery to the second charge amount" includes:

[0103] S401 , using a current with a third amplification factor to charge the battery to a third charge amount.

[0104] The third charge amount may be 20% SOC, or 40% SOC, etc.

[0105] In the embodiment of the present application, the preset charging strategy may include charging the battery with a current of a third magnification, that is, charging the battery with a current of a third magnification and charging the battery to a third charge amount. For example, charging the battery with a current of a magnification of 1.6C and charging the battery to a SOC of 40%.

[0106] S402, using a current of a fourth magnification to charge the third battery to a second charge amount; the fourth magnification is smaller than the third magnification; the second charge amount is larger than the third charge amount.

[0107] The fourth magnification is smaller than the third magnification. The fourth magnification may be 1.6C, 1C, 0.7C, etc.

[0108] In the embodiment of the present application, based on the above steps, after the battery is charged to the third charge amount, the battery with the third charge amount can continue to be charged with the current of the fourth magnification and charged to the second charge amount. For example, the battery is first charged with the current of the magnification of 1.6C to charge the battery to 40% SOC, and then the battery is charged with the current of the magnification of 1.0C to charge the battery to 65% SOC.

[0109] The charging method described in the embodiment of the present application charges the battery with a second charge before discharging the battery. Specifically, the battery can be charged multiple times using currents with different amplification factors, and then a discharge operation is performed on the charged battery, so that the discharge operation can regulate the dendrite lithium deposition surface of the battery, thereby reducing the lithium deposition of the battery.

[0110] Exemplary explanation of the above Figure 2-Figure 4 The charging method described in the embodiment adopts a preset discharge strategy to charge the lithium-ion battery. The specific charging environment includes: 1. Test temperature: 25degC; 2. Charging SOC range: 2% to 96%; 3. Test battery capacity: 117Ah; 4. Battery test cutoff condition: cycle value 600cls. The specific charging process includes:

[0111] Process 1, the battery is charged using the following preset discharge strategy: 1.6C CC 40%, 1C CC 65%, 3CDC 10s, and then every 5% of charging, 2.5C DC 10s, until it is charged to 96%.

[0112] The charging method of this process 1 first uses a current with a magnification of 1.6 times and a current with a magnification of 1.0 times to charge the battery to 65%, and then uses a current with a magnification of 3 times to discharge the battery for 10 seconds. After each 5% of charging, the battery is discharged for 10 seconds with a current with a magnification of 2.5 times, and this is performed until the battery is charged to 96%.

[0113] Process 2, the battery is charged using the following preset discharge strategy: 1.6C CC 40%, 1C CC 65%, 3CDC 2s, and then 2.5C DC 2s for each subsequent 1% charge until it is charged to 96%.

[0114] The charging method of this process 2 first uses a current with a magnification of 1.6 times and a current with a magnification of 1.0 times to charge the battery to 65%, then uses a current with a magnification of 3 times to discharge the battery for 2 seconds, and then for every 1% of charging thereafter, uses a current with a magnification of 2.5 times to discharge the battery for 2 seconds, and so on until the battery is charged to 96%.

[0115] In one embodiment, a cyclic charging method is also provided, namely, Figure 2 The charging method described in the embodiment, Figure 5 As shown, the steps include:

[0116] S202, charging the battery for a first number of cycles according to a first charging strategy to obtain a charged battery: the first charging strategy includes charging the battery at intervals according to currents with different amplification factors until the battery is charged to a preset charge.

[0117] The first cycle number can be determined according to actual charging requirements, for example, the first cycle number can be 20 cls.

[0118] The embodiment of the present application relates to a method for normal charging of a battery, that is, using currents with different magnifications to charge the battery at intervals until the battery is charged to a preset charge, so that the charging step can be cyclically executed for a first number of cycles. Among them, the current with the magnification used for charging each interval charge can be the same or different; when the current with the magnification used for charging each interval charge is different, as the charge amount on the battery increases, the charging current also decreases accordingly. For example, in process 3, the battery is charged using the following first charging strategy: 1.6C CC 40%, 1C CC 65%, 0.7C CC 80%, 0.33C CC 96%. The charging device can cycle through process 3 20 times to complete charging.

[0119] Correspondingly, when the charging device executes step S201, the specific execution steps are: taking the second cycle number as the cycle cutoff condition, and the cycle execution step: during the battery charging process, using a preset discharge strategy to discharge the battery multiple times until the battery is charged to a preset charge amount.

[0120] The second cycle number can be determined according to actual charging requirements, for example, the second cycle number can be 20 cls. The second cycle number can be the same as or different from the first cycle number.

[0121] In the embodiment of the present application, when the charging device completes the cycle charging by the method of S202, the actual use of the battery can be simulated, that is, after the battery is cycled for a period of time, lithium deposition has occurred on the surface of the battery. In this scenario, the above method is used again. Figure 2-Figure 4 The charging method described in any embodiment charges the battery for a second number of cycles to complete charging of the battery.

[0122] The charging method described in the embodiment of the present application can simulate the scenario in which lithium deposition occurs on the surface of the battery after the battery has been actually used for a period of time by cyclically charging the battery and then cyclically charging and discharging the battery. That is, by adopting a preset discharge strategy to charge and discharge the battery in which lithium deposition has occurred, the appearance of lithium deposition on the battery surface can be regulated, so that the lithium deposition on the battery surface is evenly distributed, reducing the risk of the lithium deposition tip piercing the battery diaphragm, thereby achieving the effect of reducing lithium deposition in the battery.

[0123] The following example compares the effects of the charging methods of the above-mentioned process 1, process 2, process 3 and process 4. Figure 6As shown, Figure a is a schematic diagram of the battery surface after charging through process 3, Figure b is a schematic diagram of the battery surface after charging through process 1, Figure c is a schematic diagram of the battery surface after charging through process 2, and Figure d is a schematic diagram of the battery surface after charging through process 4. It can be determined that after the battery is quickly charged using the fast charging process (process 3, Figure a), the local lithium deposition on the battery surface is more serious, and the thickness of the lithium deposition is about 55μm. When the battery is charged using the charging method described in the above embodiment of the present application (process 1, Figure b), the lithium deposition morphology on the battery surface is greatly improved, which is manifested as a reduction in the lithium deposition area. Compared with the charging result of process 3 (Figure a), the lithium deposition thickness decreases by more than 100%, which is 20.2μm. When the battery is charged using another charging method described in the above embodiment of the present application (process 2, Figure c), the lithium deposition area is also reduced, specifically 32.3μm, which shortens the discharge time based on the charging result of process 1 (Figure b), but the improvement effect of the lithium deposition morphology is not as good as the improvement effect of the lithium deposition morphology of process 1 (Figure b). When the battery is charged using another charging method (Process 4, Figure d) described in the above-mentioned embodiment of the present application, the thickness of the lithium deposition in the battery is reduced to 45.5 μm compared to the charging result of Process 3 (Figure a), but it is not as good as the lithium deposition morphology improvement effect of Process 1 (Figure b) and Process 2 (Figure c).

[0124] In one embodiment, there is also provided a method for obtaining Figure 2 The method of the discharge parameters in the embodiment, such as Figure 7 Said method comprises:

[0125] S501, applying currents with different test parameters to the target battery for discharge, and measuring the lithium deposition current density corresponding to each test parameter at the lithium deposition site.

[0126] The target battery is the battery to be tested. The lithium deposition site indicates the location on the target battery where lithium deposition is likely to occur, which can be determined in advance according to the type of the target battery. The test parameters include the test magnification and the test discharge time.

[0127] In an embodiment of the present application, the charging device may test the target battery in advance. Optionally, the charging and discharging process of the target battery may be simulated for testing; optionally, the target battery may be actually tested. Specifically, the lithium deposition site on the negative electrode surface of the target battery may be determined according to the type of the target battery, and the target battery may be discharged by applying currents with different test parameters. In this process, when each test parameter is applied for discharge, the lithium deposition current density on the negative electrode surface of the battery is measured at the lithium deposition site. For example, when the test parameters include a first test parameter, a second test parameter, and a third test parameter, the corresponding measurements obtain the lithium deposition current density corresponding to the first test parameter, the lithium deposition current density corresponding to the second test parameter, and the lithium deposition current density corresponding to the third test parameter.

[0128] S502, determining a discharge parameter according to the lithium deposition current density corresponding to each test parameter and a preset lithium deposition current density threshold.

[0129] The preset lithium deposition current density threshold is used to measure the improvement effect of the lithium deposition appearance of the battery negative electrode, and can be determined in advance according to the lithium deposition property parameters. For example, when the lithium deposition current density corresponding to the test parameter is less than the preset lithium deposition current density threshold, it means that when the test parameter is used to discharge the target battery, the improvement effect on the lithium deposition appearance is the best.

[0130] In the embodiment of the present application, when the charging device obtains the lithium deposition current density corresponding to each test parameter based on the above steps, the lithium deposition current density corresponding to each test parameter can be further compared with the preset lithium deposition current density threshold, and the lithium deposition current density that meets the requirements can be screened out according to the comparison result, so that the test parameter corresponding to the lithium deposition current density that meets the requirements is used as the discharge parameter, so that the discharge parameters are executed based on the discharge parameters. Figure 2-Figure 6 When the charging method described in the embodiment is used, the best lithium deposition appearance improvement effect can be achieved, thereby reducing lithium deposition on the battery surface. It should be noted that the lithium deposition current density that meets the requirements is a relatively small lithium deposition current density.

[0131] The method described in the embodiments of the present application can obtain the best discharge parameters through experimental measurement, and then discharge the battery according to the best discharge parameters to achieve the best lithium deposition appearance improvement effect, thereby reducing lithium deposition on the battery surface.

[0132] In one embodiment, the test parameters include a test discharge duration and a plurality of different test magnifications, and the preset lithium deposition current density threshold includes a first lithium deposition current density threshold. Based on this, a measurement method is provided, such as Figure 8 Said method comprises:

[0133] S601, applying a test discharge time and a current with different test magnifications to the target battery for discharge, and measuring the lithium deposition current density corresponding to each magnification at the lithium deposition site.

[0134] In an embodiment of the present application, during a charging test on a target battery, the charging device may apply currents with the same test discharge duration and different amplification factors to the target battery for discharge. When the current with each amplification factor is applied for discharge, the lithium deposition current density on the surface of the negative electrode of the battery is measured at the lithium deposition site.

[0135] S602, determining a first magnification ratio according to the lithium deposition current density corresponding to each magnification ratio and a first lithium deposition current density threshold.

[0136] The first lithium deposition current density threshold is used to measure the improvement effect of the lithium deposition appearance of the battery negative electrode, and can be determined in advance according to the lithium deposition property parameters. For example, when the lithium deposition current density corresponding to the magnification is less than the first lithium deposition current density threshold, it means that when the current with the magnification is used to discharge the target battery, the improvement effect on the lithium deposition appearance is the best.

[0137] In the embodiment of the present application, when the charging device obtains the lithium deposition current density corresponding to each magnification based on the above steps, the lithium deposition current density corresponding to each magnification can be further compared with the first lithium deposition current density threshold, and the lithium deposition current density less than the first lithium deposition current density threshold is specifically screened out, so that the magnification corresponding to the screened lithium deposition current density is used as the first magnification, so that the current based on the first magnification is executed. Figure 2-Figure 6 When the charging method described in the embodiment is used, the best effect of improving the appearance of lithium deposition can be achieved, thereby reducing lithium deposition on the surface of the battery. It should be noted that the first lithium deposition current density threshold can also be a range of lithium deposition current density thresholds. When comparing the lithium deposition current densities corresponding to each magnification with the first lithium deposition current density threshold, the lithium deposition current densities that fall within the range of the first lithium deposition current density threshold can be screened out, and then the magnification corresponding to the screened lithium deposition current density is used as the first magnification. It should be further pointed out that pulse discharge can be either constant current discharge or variable current discharge. For relative pulse discharge power, the constant current discharge scheme has a slight advantage.

[0138] The method described in the above embodiment is exemplified as follows: Assuming that pulse currents with magnifications of 0.5, 1.0, 2.0, 3.0, and 4.0 and a discharge duration of 10s are applied to the target battery for discharge, the measurement results under different magnifications and the same discharge duration can be obtained, that is, the correlation between different magnifications and lithium plating current density can be obtained, see Fig. 9The test curve shown in FIG. 1 shows that the abscissa represents the lithium deposition site of the target battery, the ordinate represents the lithium deposition current density, and the lithium deposition site of 10 is the site most susceptible to lithium deposition. Obviously, when the magnification reaches 3C, the lithium deposition current density has dropped to a very low level. At this time, further increasing the magnification has little effect on improving lithium deposition. Therefore, the magnification of the current used for intermittent discharge of the target battery is preferably 2C to 3C. The lithium deposition current density corresponding to the magnification in this range is less than the first lithium deposition current density threshold, and is a lithium deposition current density that meets the requirements, that is, a smaller lithium deposition current density.

[0139] The embodiment of the present application determines the optimal magnification by obtaining the correlation between different magnifications and lithium plating current density, thereby determining that a large-rate pulse current is used for uninterrupted discharge during the battery charging process, which can achieve lithium cutting at the tip of the dendrite lithium plating, that is, it can enhance the improvement effect of lithium plating to a certain extent, thereby reducing lithium plating on the battery surface.

[0140] In one embodiment, the test parameters include a test magnification and a plurality of different test discharge durations, and the preset lithium deposition current density threshold includes a second lithium deposition current density threshold. Based on this, another measurement method is provided, such as Fig.10 Said method comprises:

[0141] S701, applying a current with a test magnification and different test discharge durations to the target battery for discharge, and measuring the lithium deposition current density corresponding to each test discharge duration at the lithium deposition site.

[0142] In an embodiment of the present application, during a charging test on a target battery, the charging device can apply currents with the same test magnification and different test discharge durations to the target battery for discharge. When discharging with a current of each test discharge duration, the lithium deposition current density on the surface of the negative electrode of the battery is measured at the lithium deposition site.

[0143] S702, determining a first discharge duration according to the lithium deposition current density and the second lithium deposition current density threshold corresponding to each test discharge duration.

[0144] Among them, the second lithium deposition current density threshold is used to measure the improvement effect of the lithium deposition appearance of the battery negative electrode, and can be determined in advance according to the lithium deposition property parameters. For example, when the lithium deposition current density corresponding to the test discharge duration is less than the second lithium deposition current density threshold, it means that when the current of the test discharge duration is applied to discharge the target battery, the improvement effect on the lithium deposition appearance is the best.

[0145] In the embodiment of the present application, when the charging device obtains the lithium deposition current density corresponding to each test discharge time based on the aforementioned steps, the lithium deposition current density corresponding to each test discharge time can be further compared with the second lithium deposition current density threshold, and the lithium deposition current density less than the second lithium deposition current density threshold can be specifically screened out, so that the test discharge time corresponding to the screened lithium deposition current density is used as the first amplification time, so that the current based on the first amplification time is executed. Figure 2-Figure 6 When the charging method described in the embodiment is used, the best effect of improving the appearance of lithium deposition can be achieved, thereby reducing lithium deposition on the surface of the battery. It should be noted that the second lithium deposition current density threshold can also be a range of lithium deposition current density thresholds. When comparing the lithium deposition current density corresponding to each test discharge duration with the second lithium deposition current density threshold, the lithium deposition current density that falls within the range of the second lithium deposition current density threshold can be screened out, and then the test discharge duration corresponding to the screened lithium deposition current density is used as the first amplification duration. It should be further pointed out that pulse discharge can be either constant current discharge or variable current discharge. For relative pulse discharge power, the constant current discharge scheme has a slight advantage.

[0146] The method described in the above embodiment is exemplified as follows: Assuming that the target battery is respectively discharged with a test discharge duration of 2s, 4s, 6s, 8s, 10s, 15s, 20s, and 30s and a pulse current with a magnification of 3C, the measurement results under different test discharge durations and the same magnification can be obtained, that is, the correlation between different test discharge durations and lithium plating current density can be obtained, see Fig.11 The test curve shown, wherein the abscissa represents the lithium deposition site of the target battery, the ordinate represents the lithium deposition current density, and the lithium deposition site of 10 is the site most prone to lithium deposition. Obviously, with the increase of the test discharge time, the lithium deposition current density decreases significantly. When the test discharge time exceeds 6s, the lithium deposition current density has dropped to a very low level. At this time, if the test discharge time is further increased, the improvement effect on lithium deposition is not significant. Therefore, the test discharge time of the pulse current used for intermittent discharge of the target battery is preferably 8s to 15s. The lithium deposition current density corresponding to the test discharge time in this interval is less than the second lithium deposition current density threshold, and is a lithium deposition current density that meets the requirements, that is, a smaller lithium deposition current density.

[0147] The embodiment of the present application determines the optimal test discharge time by obtaining the correlation between different test discharge times and lithium plating current density, thereby determining that a pulse current with the optimal test discharge time is used for uninterrupted discharge during the battery charging process, which can achieve lithium cutting at the tip of dendrite lithium plating, that is, it can enhance the improvement effect of lithium plating to a certain extent, thereby reducing lithium plating on the battery surface.

[0148] In summary, the most effective charging strategy for the battery during fast charging is to continuously (such as once every 20% SOC) apply a large rate (2C-3C) and a short time (8s-15s) pulse current for discharge. This can ensure the elimination of the dendrite tips of the battery to a certain extent while not affecting the charging efficiency.

[0149] Next, the tip delithiation effect of discharging the battery with a current of a larger magnification and the tip delithiation effect of discharging the battery with a current of a smaller magnification are described. Fig.12 The schematic diagram of the change of the morphology of lithium deposition on the battery surface shown in the figure, wherein Figure a, Figure b, and Figure c are the changes in the morphology of lithium deposition on the battery surface during the discharge process. The particles adsorbed on the surface of the battery are lithium deposition, and the particles suspended in the air are lithium ions in the electrolyte area. It can be seen that after the battery is discharged, a large rate of discharge current is used for discharge. At this time, the electrolyte environment on the surface of the lithium dendrite appears to be relatively scarce in lithium ions, that is, the lithium ions are translated and the number is reduced, making it easier to achieve effective lithium removal at the tip of the dendrite, making the lithium deposition morphology more uniform, and to a certain extent, it can avoid the occurrence of local generation of lithium dendrites piercing the diaphragm, thereby reducing the risk of lithium deposition short circuit. It can be seen that in the process of fast charging the battery, the strategy of discharging the battery with a current of a larger magnification can realize the regulation of the morphology of lithium deposition on the battery surface, and has a better effect of lithium removal at the tip of the dendrite. It should be noted that the larger magnification here refers to a magnification of not less than 1.5C, and the most preferred magnification is any value of 2C to 3C.

[0150] When discharging the battery with a current of smaller magnification, see Fig.13 The figure shows the schematic diagram of the changes in the morphology of lithium deposition on the battery surface, where Figures a, b, and c show the changes in the morphology of lithium deposition on the battery surface during the discharge process. The particles adsorbed on the battery surface are lithium deposition, and the particles suspended in the air are lithium ions in the electrolyte area. It can be seen that after lithium deposition, the battery is discharged using a small rate discharge current. At this time, the lithium ion concentration in the electrolyte environment is not much different, and the driving force for the release of active lithium from the surface of lithium dendrites is not much different, so effective lithium dendrite interface modification cannot be achieved.

[0151] By comparing Fig.12 and Fig.13From the charging process of the two current magnifications shown in the figure, it can be seen that in the actual use of the battery pack, the effective response strategy is to continuously introduce a large-rate pulse discharge current during the charging process. On the one hand, it can achieve rapid depolarization of the battery, continuously increase the anode potential during the charging process, and avoid lithium plating to a certain extent; on the other hand, if lithium plating occurs in the battery cell, the lithium plating at the tip of the dendrite can be eliminated in time. By interfacial regulation of the lithium plating morphology, it can avoid lithium dendrites piercing the diaphragm to a certain extent, thereby reducing the risk of short-circuit thermal runaway of the battery pack.

[0152] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0153] Based on the same inventive concept, the embodiment of the present application also provides a charging device for implementing the above-mentioned charging method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in one or more charging device embodiments provided below can refer to the limitations on the charging method above, and will not be repeated here.

[0154] In one embodiment, Fig.14 As shown, a charging device is provided, comprising:

[0155] The charging module 10 is used to discharge the battery multiple times using a preset discharge strategy during the battery charging process until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0156] In one embodiment, the charging module 10 is Fig.15 As shown, including:

[0157] The first charging unit 100 is used for discharging the battery for a first discharge time by using a current with a first amplification factor after charging the battery with a first charge amount each time by using the preset discharge strategy during the charging process of the battery.

[0158] In one embodiment, Fig.16 As shown, the above charging device also includes:

[0159] The charging and discharging module 11 is used to discharge the battery for a second time using a current with a second amplification factor after the battery is charged to a second charge amount according to the preset charging strategy in the first charging stage of the battery;

[0160] Correspondingly, the above-mentioned charging module 10 is specifically used to adopt the preset discharge strategy to discharge the battery for a first discharge time after charging the battery with a first charge amount each time during the second charging stage of the battery; wherein the second amplification factor is greater than the first amplification factor.

[0161] In one embodiment, Fig.17 As shown, the charging and discharging module 11 includes:

[0162] A second charging unit 110, configured to charge the battery to the second charge amount using a current of a third amplification factor;

[0163] The first discharging unit 111 is used to discharge the charged battery for a second time period using the current of the second amplification factor; the second amplification factor is greater than the third amplification factor.

[0164] In one embodiment, the second charging unit 110 is specifically used to charge the battery to a third charge amount using the current of the third magnification; and to charge the charged battery to the second charge amount using the current of the fourth magnification; the fourth magnification is smaller than the third magnification; and the second charge amount is larger than the third charge amount.

[0165] In one embodiment, Fig.18 As shown, the above charging device further includes:

[0166] The cyclic charging module 12 is used to charge the battery for a first number of cycles according to a first charging strategy to obtain a charged battery: the first charging strategy includes charging the battery at intervals according to currents with different magnifications until the battery is charged to the preset charge amount;

[0167] Correspondingly, the charging module 10 is used to cyclically execute the steps with the second cycle number as the cycle cutoff condition: during the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount.

[0168] In one embodiment, Fig.19 As shown, the above charging device further includes:

[0169] The measuring module 13 is used to discharge the target battery by applying currents with different test parameters, and measure the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site;

[0170] The determination module 14 is used to determine the discharge parameter according to the lithium deposition current density corresponding to each of the test parameters and a preset lithium deposition current density threshold.

[0171] In one embodiment, the measurement module 13 is specifically used to discharge the target battery by applying the test discharge duration and the current of the different test amplification factors, and measure the lithium deposition current density corresponding to each of the amplification factors at the lithium deposition site: correspondingly, the determination module 14 is specifically used to determine the first amplification factor based on the lithium deposition current density corresponding to each of the amplification factors and the first lithium deposition current density threshold.

[0172] In one embodiment, the measurement module 13 is specifically used to discharge the target battery by applying the test magnification and the different test discharge durations, and measure the lithium deposition current density corresponding to each of the test discharge durations at the lithium deposition site: Correspondingly, the determination module 14 is specifically used to determine the first discharge duration based on the lithium deposition current density corresponding to each of the test discharge durations and the second lithium deposition current density threshold.

[0173] Each module in the above charging device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0174] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig. 20As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a charging method is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball or a touch pad set on the computer device housing, or an external keyboard, touch pad or mouse, etc.

[0175] Those skilled in the art will understand that Fig. 20 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0176] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0177] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0178] The above embodiment provides a computer device, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0179] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0180] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0181] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0182] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0183] During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

[0184] The above embodiment provides a computer program product, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0185] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0186] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0187] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A charging method, characterized in that: The method comprises: During the battery charging process, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

2. The method according to claim 1, characterized in that The discharge parameters include a first magnification and a first discharge duration. During the process of charging the battery, the battery is discharged multiple times using a preset discharge strategy, including: During the charging process of the battery, after charging the battery with a first charge amount each time, the preset discharge strategy is adopted to discharge the battery with a current of a first amplification factor for a first discharge duration.

3. The method according to claim 2, characterized in that The method further comprises: In the first charging stage of the battery, after the battery is charged to a second charge amount according to the preset charging strategy, the battery is discharged for a second time period using a current with a second amplification factor; In the process of charging the battery, after charging the battery with a first charge amount each time, the preset discharge strategy is used to discharge the battery with a current of a first magnification ratio for a first discharge duration, including: In the second charging stage of the battery, the preset discharge strategy is adopted to discharge the battery for a first discharge time using a current of a first magnification after each charging of the battery with a first charge amount; Wherein, the second magnification is greater than the first magnification.

4. The method according to claim 3, characterized in that The method of discharging the battery for a second time period using a current of a second amplification factor after the battery is charged to a second charge amount according to the preset charging strategy includes: Using a current having a third amplification factor, charging the battery to the second charge amount; The charged battery is discharged for a second time period using the current of the second amplification factor; the second amplification factor is greater than the third amplification factor.

5. The method according to claim 4, characterized in that The method of charging the battery to the second charge amount using a current having a third magnification includes: Using the current of the third amplification factor, charging the battery to a third charge amount; The charged battery is charged to the second charge amount using a current of a fourth magnification; the fourth magnification is smaller than the third magnification; and the second charge amount is larger than the third charge amount.

6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: The battery is charged for a first number of cycles according to a first charging strategy to obtain a charged battery: the first charging strategy includes charging the battery with interval charge amounts according to currents with different magnifications until the battery is charged to the preset charge amount; Correspondingly, during the process of charging the battery, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount; the discharge strategy includes a correspondence between multiple charge amounts and discharge parameters, including: The second cycle number is used as the cycle cutoff condition, and the cycle executes the steps: in the process of charging the battery, the battery is discharged multiple times using a preset discharge strategy until the battery is charged to a preset charge amount.

7. The method according to any one of claims 2 to 5, characterized in that: The method further comprises: Applying currents with different test parameters to the target battery for discharge, and measuring the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site; The discharge parameter is determined according to the lithium deposition current density corresponding to each of the test parameters and a preset lithium deposition current density threshold.

8. The method according to claim 7, characterized in that The test parameters include a test discharge duration and a plurality of different test magnifications, the preset lithium deposition current density threshold includes a first lithium deposition current density threshold, the currents with different test parameters are applied to the target battery for discharge, and the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site is measured, including: Applying the test discharge duration and the current of the different test magnifications to the target battery for discharge, and measuring the lithium deposition current density corresponding to each of the magnifications at the lithium deposition site; The step of determining the discharge parameter according to the lithium deposition current density corresponding to each of the test parameters and a preset lithium deposition current density threshold comprises: The first magnification is determined according to the lithium deposition current density corresponding to each of the magnifications and the first lithium deposition current density threshold.

9. The method according to claim 7, characterized in that: The test parameters include a test magnification and a plurality of different test discharge durations, the preset lithium deposition current density threshold includes a second lithium deposition current density threshold, the currents with different test parameters are applied to the target battery for discharge, and the lithium deposition current density corresponding to each of the test parameters at the lithium deposition site is measured, including: Applying the current of the test magnification and the different test discharge durations to the target battery for discharge, and measuring the lithium deposition current density corresponding to each of the test discharge durations at the lithium deposition site; The step of determining the discharge parameter according to the lithium deposition current density corresponding to each of the test parameters and a preset lithium deposition current density threshold comprises: The first discharge duration is determined according to the lithium deposition current density corresponding to each of the test discharge durations and the second lithium deposition current density threshold.

10. The method according to any one of claims 1 to 5, characterized in that: The first magnification has a value range of 2C to 3C.

11. The method according to any one of claims 1 to 5, characterized in that: The first discharge duration ranges from 8s to 15s.

12. A charging device, characterized in that: The device comprises: The charging module is used to discharge the battery multiple times using a preset discharge strategy during the battery charging process until the battery is charged to a preset charge amount; the preset discharge strategy includes a correspondence between multiple charge amounts and discharge parameters.

13. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 11 are implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

15. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

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