Lithium battery charging control method and device, equipment and storage medium

Abstract

The invention relates to the technical field of batteries, and provides a lithium battery charging control method, device and equipment and a storage medium, and the method comprises the steps: obtaining a pre-stored charging current control curve of which the overall trend is a bell-shaped curve; in the charging process of a target lithium battery, the charging current of the target lithium battery is controlled according to the charging current control curve, so that the charging capacity of the target lithium battery is increased according to the overall trend of the S-shaped capacity increasing curve. According to the embodiment of the invention, the formation of multi-layer lithium dendrites in the charging process of the lithium battery can be inhibited, so that the coulombic efficiency and the cycle number of the lithium battery are improved.

Description

Technical Field

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

[0002] Lithium batteries are widely used due to their high energy density, fast charging speed and long service life. However, during the charging process of lithium batteries, multi-layer lithium dendrites will form. The large-scale formation of multi-layer lithium dendrites can easily cause internal short circuits in the battery, leading to serious battery safety accidents. At present, multi-layer lithium dendrites have become one of the fundamental problems affecting the safety and stability of lithium batteries. Therefore, how to inhibit the formation of multi-layer lithium dendrites has become an urgent problem to be solved in the field of lithium batteries. Summary of the invention

[0003] The purpose of the embodiments of this specification is to provide a lithium battery charging control method, device, equipment and storage medium to suppress the formation of multi-layer lithium dendrites during the charging process of the lithium battery.

[0004] To achieve the above objectives, on the one hand, an embodiment of this specification provides a lithium battery charging control method, including:

[0005] Obtaining a pre-stored charging current control curve whose overall trend is a bell-shaped curve;

[0006] During the charging process of the target lithium battery, the charging current of the target lithium battery is controlled according to the charging current control curve, so that the charging capacity of the target lithium battery increases with the overall trend of the S-shaped capacity growth curve.

[0007] In the lithium battery charging control method of the embodiment of this specification, the S-shaped capacity growth curve includes y=K / 1+e a +bt ;

[0008] Among them, y is the charging capacity of the target lithium battery, K is the specified maximum charging capacity of the target lithium battery, e is a natural constant, a and b are preset constants, and t is the charging time of the target lithium battery.

[0009] In the lithium battery charging control method of the embodiment of this specification, controlling the charging current of the target lithium battery according to the charging current control curve includes:

[0010] Controlling the charging current of the target lithium battery according to the formula dy / dt=-[b(Ky)] / K;

[0011] Wherein, y is the charging capacity of the target lithium battery, t is the charging time of the target lithium battery, dy / dt is the charging current of the target lithium battery, b is a preset constant, and K is the specified maximum charging capacity of the target lithium battery.

[0012] In the lithium battery charging control method of the embodiment of this specification, the charging current control curve includes a charging current sequence composed of a plurality of discrete charging current value points.

[0013] In the lithium battery charging control method of the embodiment of this specification, the specified maximum charging capacity is a variable with a decreasing gradient during the charging process of the target lithium battery.

[0014] In the lithium battery charging control method of the embodiment of this specification, the specified maximum charging capacity decreases gradually in an arithmetic progression.

[0015] In the lithium battery charging control method of the embodiment of this specification, the specified maximum charging capacity is a constant value during the charging process of the target lithium battery.

[0016] In the lithium battery charging control method of the embodiment of this specification, the constant value is determined according to the formula K=Q0×p, where Q0 is the positive electrode capacity inside the target lithium battery, p is a preset constant, and 0<p≤1.

[0017] In the lithium battery charging control method of the embodiment of this specification, the preset constants a and b satisfy the following: Among them, t K / 2 The charging time corresponding to charging the target lithium battery to half of K.

[0018] In the lithium battery charging control method of the embodiment of this specification, the maximum value of the charging current control curve is

[0019] On the other hand, the embodiments of this specification also provide a battery management device, including:

[0020] A curve acquisition module, used to acquire a pre-stored charging current control curve whose overall trend is a bell-shaped curve;

[0021] The current control module is used to control the charging current of the target lithium battery according to the charging current control curve during the charging process of the target lithium battery, so that the charging capacity of the target lithium battery increases with the overall trend of the S-shaped capacity growth curve.

[0022] On the other hand, an embodiment of the present specification further provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein when the computer program is executed by the processor, the instructions of the above method are executed.

[0023] On the other hand, an embodiment of the present specification further provides a computer storage medium on which a computer program is stored. When the computer program is executed by a processor of a computer device, the instructions of the above method are executed.

[0024] On the other hand, an embodiment of the present specification further provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor of a computer device, the computer program executes instructions of the above method.

[0025] It can be seen from the technical solutions provided in the above embodiments of this specification that in the embodiments of this specification, since the charging current control curve is a bell-shaped curve as a whole, that is, the charging current control curve has the characteristics of small initial current density, large mid-term current density and small late current density, and a gradual transition; since the SEI film formed by the initial small current density has a high mechanical strength, it can resist the volume change caused by continuous lithium deposition, thereby promoting a single-layer dense lithium deposition, and can ensure the uniformity of lithium deposition, thereby inhibiting the formation of multi-layer lithium dendrites in the lithium battery during the charging process, which is beneficial to improve the coulombic efficiency and cycle number (i.e., cycle life) of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. In the drawings:

[0027] Figure 1 A schematic diagram showing application scenarios of lithium battery charging control in some embodiments of this specification is shown;

[0028] Figure 2 A flow chart showing a lithium battery charging control method in some embodiments of this specification is shown;

[0029] Figure 3 A schematic diagram showing the change of a charging current control curve and an S-shaped capacity growth curve with charging time in an exemplary embodiment of this specification;

[0030] Figure 4 A schematic diagram showing the change of the charging current control curve with the charging time in the prior art is shown;

[0031] Figure 5 A schematic diagram showing a charging current control curve changing with charging time in an exemplary embodiment of this specification;

[0032] Figure 6a A schematic diagram showing voltage changes of a lithium battery under constant current charging in the prior art is shown;

[0033] Figure 6bA schematic diagram showing voltage variation of a lithium battery when charging with a constant capacity logic stick in an exemplary embodiment of this specification is shown;

[0034] Figure 6c Shows the use of Figure 6a Schematic diagram of the change of coulombic efficiency and cycle number of lithium battery under the charging mode shown;

[0035] Figure 6d Shows the use of Figure 6b Schematic diagram of the change of coulombic efficiency and cycle number of lithium battery under the charging mode shown;

[0036] Figure 7a A schematic diagram showing the change of the voltage of a lithium battery with charging time under constant current charging and constant current discharging in the prior art;

[0037] Figure 7b A schematic diagram showing the voltage variation of a lithium battery with charging time under constant capacity logic stick charging and constant current discharge in an exemplary embodiment of this specification;

[0038] Figure 7c The lithium battery is shown in Figure 7a , Figure 7b Schematic diagram of comparison of cycle numbers under the charging and discharging modes shown;

[0039] Figure 8 A schematic diagram showing the discharge capacity, cycle number and coulombic efficiency of a lithium battery without external stress under logistic stick charging with gradient decreasing capacity in an exemplary embodiment of this specification;

[0040] Fig. 9 A structural block diagram of a battery management device in some embodiments of this specification is shown;

[0041] Fig.10 The structure block diagram of the computer device in some embodiments of the present specification is shown.

[0042] [Description of Reference Numerals]

[0043] 10. Lithium battery;

[0044] 20. Battery management device;

[0045] 91. Curve acquisition module;

[0046] 92. Current control module;

[0047] 1002. Computer equipment;

[0048] 1004. Processor;

[0049] 1006. Memory;

[0050] 1008. Driving mechanism;

[0051] 1010, input / output interface;

[0052] 1012. Input device;

[0053] 1014. Output device;

[0054] 1016. Presentation equipment;

[0055] 1018. Graphical user interface;

[0056] 1020. Network interface;

[0057] 1022. Communication link;

[0058] 1024. Communication bus. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0060] Studies have shown that the instability of the solid electrolyte film (SEI) on the surface of the lithium metal negative electrode of the lithium battery will cause the formation of multi-layer lithium dendrites, which will greatly consume the electrolyte and negative electrode active materials, thereby causing a large amount of capacity loss, and further affecting the coulombic efficiency and cycle life of the lithium battery. Among them, the SEI film is a passivation layer covering the surface of the electrode material formed by the reaction between the electrode material and the electrolyte at the solid-liquid interface during the charging and discharging process of the lithium battery. This passivation layer is an interface layer with the characteristics of a solid electrolyte.

[0061] In view of this, the embodiments of the present specification provide a new charging control technology for a lithium battery to suppress the formation of multi-layer lithium dendrites during the charging process of the lithium battery. Figure 1The lithium battery charging control scenario in some embodiments of the present specification is shown in FIG. The scenario includes a lithium battery 10 and a battery management device 20; the battery management device 20 can obtain a pre-stored charging current control curve whose overall trend is a bell-shaped curve; during the charging process of the lithium battery 10, the charging current of the lithium battery 10 is controlled according to the charging current control curve, so that the charging capacity of the lithium battery 10 increases with the overall trend of the S-shaped capacity growth curve; in this way, the formation of lithium dendrites in the lithium battery during the charging process can be suppressed.

[0062] In some embodiments of the present specification, the lithium battery 10 may include but is not limited to a lithium ion battery, a lithium metal battery, an aqueous lithium ion battery, etc. Among them, the lithium ion battery may be, for example, any one of a graphite-lithium cobalt oxide battery, a graphite-lithium iron phosphate battery, a graphite-layered oxide battery, a silicon-carbon-lithium cobalt oxide battery, a silicon-carbon-lithium iron phosphate battery, a silicon-carbon-layered oxide lithium battery, etc. The lithium metal battery may be, for example, any one of a lithium metal-lithium iron phosphate battery, a lithium metal-layered oxide battery, a lithium metal-sulfur battery, a lithium metal-air battery, etc.

[0063] In some embodiments of the present specification, the battery management device 20 may be a functional module integrated in a battery management system (BMS), or may be an independent functional module outside an independent BMS.

[0064] The present invention provides a lithium battery charging control method, which can be applied to the battery management device mentioned above. Figure 2 As shown, in some embodiments of this specification, the lithium battery charging control method may include the following steps:

[0065] Step 201: Obtain a pre-stored charging current control curve whose overall trend is a bell-shaped curve.

[0066] Step 202 : During the charging process of the target lithium battery, the charging current of the target lithium battery is controlled according to the charging current control curve, so that the charging capacity of the target lithium battery increases in accordance with the overall trend of the S-shaped capacity growth curve.

[0067] In the conventional constant current charging process of the prior art, the charging current jumps from 0 to the set constant current, which makes the mechanical strength of the SEI film initially formed in the lithium battery low. The subsequent lithium metal will pierce the SEI film during the deposition process, which can easily lead to the formation of multi-layer lithium dendrites. Figure 4As shown, in another trickle charge-constant current charge-constant voltage charge process in the prior art, the current density is also increased to the constant current density (i.e., constant current) in a very short time, so that the mechanical strength of the SEI film initially formed in the lithium battery is still relatively low, and the subsequent lithium metal will still pierce the SEI film during the deposition process, which is still likely to lead to the formation of multi-layer lithium dendrites.

[0068] However, in Figure 2 In the embodiment shown, since the charging current control curve is a bell-shaped curve as a whole (the bell-shaped curve is also called a normal curve), that is, the charging current control curve has the characteristics of low initial current density, high middle current density and low current density in the later stage, and a gradual transition (for example Figure 3 or Figure 5 As shown in the charging current control curve; Figure 3 In the figure, the horizontal axis represents the charging time and the vertical axis represents the charging capacity; Figure 5 In the figure, the horizontal axis represents the charging time and the vertical axis represents the charging current); due to the high mechanical strength of the SEI film formed by the initial small current density, it can resist the volume change caused by continuous lithium deposition, thereby promoting a single layer of dense lithium deposition and ensuring the uniformity of lithium deposition, thereby inhibiting the formation of multi-layer lithium dendrites in the lithium battery during the charging process, which is beneficial to improving the coulombic efficiency and cycle number (i.e., cycle life) of the lithium battery.

[0069] Obviously, when the cross-sectional area of ​​the charging wire remains unchanged, since the charging current and the charging current density are proportional, in other embodiments of the present specification, the charging current control curve of the present specification can also be a charging current density control curve. In this case, the charging current during the charging process is also adaptively replaced by the charging current density.

[0070] In some embodiments of the present specification, the charging current control curve with an overall trend of a bell-shaped curve means that the overall trend of the charging current control curve can be roughly a bell-shaped curve, but it does not have to strictly conform to the bell-shaped curve. The specific selection can be based on the actual application needs. In other words, it is an ideal situation that the charging current control curve is a bell-shaped curve. In actual implementation, the charging current control curve can be a charging current sequence composed of multiple discrete charging current value points. For example, in an exemplary embodiment, the charging current control curve can be expressed as {0.5mA, 1mA, 1.5mA, 2mA, 1.5mA, 0.5mA}.

[0071] Combination Figure 3As shown, in some embodiments of the present specification, when the target lithium battery is charged according to a charging current control curve that is roughly a bell-shaped curve, the charging capacity of the target lithium battery will increase in a trend that is roughly an S-shaped capacity growth curve. In some embodiments of the present specification, the S-shaped capacity growth curve may include, but is not limited to, a logistic curve (i.e., a logistic curve): y=K / 1+e a+bt ; Wherein, y is the charging capacity of the target lithium battery, K is the specified maximum charging capacity of the target lithium battery, e is a natural constant, a and b are preset constants (both can be customized as needed), and t is the charging time of the target lithium battery.

[0072] Combination Figure 3 As shown, in some embodiments of this specification, the preset constants a and b satisfy And the maximum value of the charging current control curve is Among them, t K / 2 The charging time corresponding to the target lithium battery being charged to half of K. In this way, it is possible to achieve both effective suppression of lithium dendrites and consideration of charging efficiency.

[0073] In some embodiments of the present specification, controlling the charging current of the target lithium battery according to the charging current control curve may include: controlling the charging current of the target lithium battery according to the formula dy / dt=-[b(Ky)] / K; wherein y is the charging capacity of the target lithium battery, t is the charging time of the target lithium battery, dy is the differential of y, dt is the differential of t, dy / dt is the charging current of the target lithium battery, b is a preset constant, and K is the specified maximum charging capacity of the target lithium battery.

[0074] In some embodiments of the present specification, the specified maximum charging capacity K is a fixed value during the charging process of the target lithium battery, which can help to better improve the coulombic efficiency and cycle number of the lithium battery. In some embodiments, the fixed value can be determined according to the formula K=Q0×p, where Q0 is the positive electrode capacity inside the target lithium battery, p is a preset constant, and 0<p≤1. For example, in an exemplary embodiment of the present specification, the fixed value can be calculated according to the formula K=Q0×60%.

[0075] In some embodiments of the present specification, the maximum charging capacity K is specified as a variable with a decreasing gradient during the charging process of the target lithium battery, that is, K={K0, K1, ..., K n}, and K0>K1>K2>…>K n-1 >K nThis is conducive to being able to maximize the energy storage function of the lithium battery within a safe voltage range. For example, in one embodiment of this specification, the maximum charging capacity K is specified to decrease in an arithmetic progression, for example, K = {6Ah, 5Ah, 4Ah}.

[0076] In some embodiments of the present specification, the target lithium battery is a lithium battery to be charged or a lithium battery to be charged. The target lithium battery can be a lithium battery purchased from the market or a lithium battery assembled by oneself. When the target lithium battery is a lithium battery assembled by oneself, the assembly process can include the following steps:

[0077] Step 1: Pre-treat the battery separator.

[0078] For example, taking a lithium battery as a button cell and a battery separator as a polypropylene (PP) separator, the PP separator is first made into a disc with a diameter of 19 mm, and then ultrasonically cleaned with anhydrous ethanol for 30 minutes to prevent stains or particulate matter from affecting the battery performance; then placed in a 60-degree oven to dry to prevent a humid environment from affecting the battery performance, and then the dried separator is transferred to a glove box for standby use.

[0079] Step 2: Assemble the battery.

[0080] For example, taking the assembly of a lithium-copper battery as an example, first place the negative electrode shell, spring, gasket, lithium sheet, electrolyte (30 microliters), separator, electrolyte (30 microliters), copper foil, gasket and positive electrode shell in sequence; then package the battery.

[0081] For example, taking the assembly of a copper-layered oxide lithium battery as an example, first place the negative electrode shell, spring, gasket, copper foil, electrolyte (30 microliters), separator, electrolyte (30 microliters), layered oxide positive electrode, gasket and positive electrode shell in sequence; then package the battery.

[0082] For example, in the case of assembling a copper-layered oxide soft-pack lithium battery, the copper sheet, separator, and positive electrode are stacked and wound in sequence, and then the battery is injected with electrolyte, formed, and packaged. The total capacity of the battery is 7Ah, and the electrolyte content is 21g (3g / Ah).

[0083] like Figure 6a (exist Figure 6a As shown in the figure, the lithium-copper half-cell is charged to the upper limit voltage by the constant current (1 mA) charging method in the prior art; then, the deposited lithium metal is discharged to the lower limit voltage under the discharge current of 1 mA, and the test is repeated in this way, and finally the following can be obtained: Figure 6c The coulombic efficiency and cycle number of the lithium-copper half-cell shown. Figure 6b (exist Figure 6bAs shown in the figure, the lithium-copper half-battery is charged to the upper limit voltage by adopting the constant capacity (i.e., the specified maximum charging capacity K remains unchanged) logistic stick charging method of the embodiment of this specification (charging currents of 0.5mA, 1mA, 2mA, 1.5mA, 0.5mA, and 0.5mA, wherein the duration of each charging current is half an hour, and for the convenience of describing the charging current that approximates a bell-shaped curve, the corresponding charging method is called constant capacity logistic stick charging); then, the deposited lithium metal is discharged to the set voltage value at a discharge current of 1mA, and the test is repeated in this way, and finally the following can be obtained. Figure 6d Coulombic efficiency and cycle number of the lithium-copper half-cell shown. Figure 6c and Figure 6d It can be seen that based on the traditional constant current charging method, only one of the four lithium-copper half-batteries tested simultaneously can be stably cycled to 40 cycles, and it still fails after 40 cycles; compared with the traditional constant current charging method, the four lithium-copper half-batteries tested simultaneously can be stably cycled for more than 40 cycles, indicating that the constant capacity logistic stick charging method of the embodiment of this specification can significantly improve the coulombic efficiency and cycle number of the lithium-copper half-battery.

[0084] Figure 7a Schematic diagram showing the voltage variation of a copper-layered oxide lithium battery with charging time under constant current charging (1 mA) and constant current discharging (1 mA) in the prior art; Figure 7b A schematic diagram showing the voltage variation of a copper-layered oxide lithium battery over charging time under constant capacity logic stick charging (charging currents of 0.5 mA, 1 mA, 2 mA, 1.5 mA, and 0.5 mA, wherein the duration of each charging current is half an hour) and constant current discharge (1 mA) in an exemplary embodiment of this specification. Figure 7c Based on the traditional constant current charging method, the copper-layered oxide lithium battery has poor cycle stability, can only stably cycle 40 times, and has a low coulombic efficiency (about 96%, see Figure 7c Compared with the traditional constant current charging method, the constant capacity logic stick charging method of the embodiment of this specification is used to test the copper-layered oxide lithium battery, and the coulomb efficiency can reach 98%, and the cycle life exceeds 60 cycles ( Figure 7c The roughly stable curve above shows that the constant capacity logistic stick charging method of the embodiment of this specification can significantly improve the coulombic efficiency and cycle life of the copper-layered oxide lithium battery.

[0085] Figure 8The figure shows the discharge capacity, cycle number and coulombic efficiency of the copper-layered oxide soft-pack lithium battery when the copper-layered oxide soft-pack lithium battery is tested without external stress under the logistic stick charge with gradient decreasing capacity. Among them, in the logic stick charging with gradient decreasing capacity, the specified maximum charging capacity K is 6Ah, 5Ah, and 4Ah, that is, K = {6Ah, 5Ah, 4Ah}, and the total battery charging time for each specified maximum charging capacity K is 5 hours. During the charging process of K = 6Ah, the currents are: 0.6A, 1.2A, 2.4A, 1.2A, 0.6A, and the duration of each current is 1 hour, and the discharge current is 1.2A, until it is discharged to the lower limit voltage; during the charging process of K = 5Ah, the currents are: 0.5A, 1A, 2A, 1A, 0.5A, and the duration of each current is 1 hour, and the discharge current is 1A, until it is discharged to the lower limit voltage; during the charging process of K = 4Ah, the currents are: 0.4A, 0.8A, 1.6A, 0.8A, 0.4A, and the duration of each current is 1 hour, and the discharge current is 0.8A, until it is discharged to the lower limit voltage. From Figure 8 It can be seen that when the copper-layered oxide soft-pack lithium battery is tested without external stress using the logistic stick charging method with gradient decreasing capacity of the embodiment of this specification, the copper-layered oxide soft-pack lithium battery can stably cycle for more than 50 times without external stress; thus, it is shown that the logistic stick charging method with gradient decreasing capacity of the embodiment of this specification can significantly improve the coulombic efficiency and cycle life of the copper-layered oxide soft-pack lithium battery.

[0086] Although the process flows described above include multiple operations that occur in a particular order, it should be clearly understood that the processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0087] refer to Fig. 9 As shown, in some embodiments of this specification, the battery management device may include:

[0088] A curve acquisition module 91 is used to acquire a pre-stored charging current control curve whose overall trend is a bell-shaped curve;

[0089] The current control module 92 is used to control the charging current of the target lithium battery according to the charging current control curve during the charging process of the target lithium battery, so that the charging capacity of the target lithium battery increases with the overall trend of the S-shaped capacity growth curve.

[0090] In the battery management device of some embodiments of the present specification, the S-shaped capacity growth curve includes y=K / 1+e a +bt ;

[0091] Among them, y is the charging capacity of the target lithium battery, K is the specified maximum charging capacity of the target lithium battery, e is a natural constant, a and b are preset constants, and t is the charging time of the target lithium battery.

[0092] In the battery management device of some embodiments of the present specification, the step of controlling the charging current of the target lithium battery according to the charging current control curve includes:

[0093] Controlling the charging current of the target lithium battery according to the formula dy / dt=-[b(Ky)] / K;

[0094] Wherein, y is the charging capacity of the target lithium battery, t is the charging time of the target lithium battery, dy / dt is the charging current of the target lithium battery, b is a preset constant, and K is the specified maximum charging capacity of the target lithium battery.

[0095] In the battery management device of some embodiments of the present specification, the charging current control curve includes a charging current sequence composed of a plurality of discrete charging current value points.

[0096] In the battery management device of some embodiments of the present specification, the specified maximum charging capacity is a gradient decreasing variable during the charging process of the target lithium battery.

[0097] In the battery management device of some embodiments of the present specification, the specified maximum charging capacity decreases gradually in an arithmetic progression.

[0098] In the battery management device of some embodiments of the present specification, the specified maximum charging capacity is a constant value during the charging process of the target lithium battery.

[0099] In the battery management device of some embodiments of the present specification, the constant value is determined according to the formula K=Q0×p, where Q0 is the positive electrode capacity inside the target lithium battery, p is a preset constant, and 0<p≤1.

[0100] In the lithium battery charging control method of the embodiment of this specification, the preset constants a and b satisfy the following: Among them, t K / 2 The charging time corresponding to charging the target lithium battery to half of K.

[0101] In the battery management device of some embodiments of the present specification, the maximum value of the charging current control curve is

[0102] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing this specification, the functions of each unit can be implemented in the same or multiple hardware and / or software.

[0103] The embodiments of this specification also provide a computer device. Fig.10 As shown, in some embodiments of the present specification, the computer device 1002 may include one or more processors 1004, such as one or more central processing units (CPUs) or graphics processing units (GPUs), and each processing unit may implement one or more hardware threads. The computer device 1002 may also include any memory 1006, which is used to store any kind of information such as code, settings, data, etc. In a specific embodiment, the computer program on the memory 1006 and can be run on the processor 1004, when the computer program is run by the processor 1004, the instructions of the lithium battery charging control method described in any of the above embodiments can be executed. Non-limiting, for example, the memory 1006 may include any one or more combinations of the following: any type of RAM, any type of ROM, flash memory device, hard disk, optical disk, etc. More generally, any memory can use any technology to store information. Further, any memory can provide volatile or non-volatile retention of information. Further, any memory can represent a fixed or removable component of the computer device 1002. In one embodiment, when the processor 1004 executes the associated instructions stored in any memory or combination of memories, the computer device 1002 can perform any operation of the associated instructions. The computer device 1002 also includes one or more drive mechanisms 1008 for interacting with any memory, such as a hard disk drive mechanism, an optical disk drive mechanism, etc.

[0104] The computer device 1002 may also include an input / output interface 1010 (I / O) for receiving various inputs (via input device 1012) and for providing various outputs (via output device 1014). A specific output mechanism may include a presentation device 1016 and an associated graphical user interface 1018 (GUI). In other embodiments, the input / output interface 1010 (I / O), input device 1012, and output device 1014 may not be included, and the computer device 1002 may be used as a computer device in a network. The computer device 1002 may also include one or more network interfaces 1020 for exchanging data with other devices via one or more communication links 1022. One or more communication buses 1024 couple the components described above together.

[0105] The communication link 1022 may be implemented in any manner, for example, via a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 1022 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc. governed by any protocol or combination of protocols.

[0106] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), computer-readable storage media, and computer program products of some embodiments of the present specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processor to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processor generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0107] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processor to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0108] These computer program instructions can also be loaded onto a computer or other programmable data processor so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0109] In a typical configuration, a computer device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0110] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0111] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computer device. As defined in this specification, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0112] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0113] The present specification embodiments may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present specification embodiments may also be practiced in distributed computing environments where tasks are performed by remote processors connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0114] It should also be understood that in the embodiments of this specification, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0115] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of this specification. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0117] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A lithium battery charging control method, characterized in that: include: Obtaining a pre-stored charging current control curve whose overall trend is a bell-shaped curve; During the charging process of the target lithium battery, the charging current of the target lithium battery is controlled according to the charging current control curve, so that the charging capacity of the target lithium battery increases with the overall trend of the S-shaped capacity growth curve.

2. The lithium battery charging control method according to claim 1, characterized in that: The S-shaped capacity growth curve includes y=K / 1+e a+bt ; Among them, y is the charging capacity of the target lithium battery, K is the specified maximum charging capacity of the target lithium battery, e is a natural constant, a and b are preset constants, and t is the charging time of the target lithium battery.

3. The lithium battery charging control method according to claim 2, characterized in that: The controlling the charging current of the target lithium battery according to the charging current control curve comprises: Controlling the charging current of the target lithium battery according to the formula dy / dt=-[b(Ky)] / K; Wherein, y is the charging capacity of the target lithium battery, t is the charging time of the target lithium battery, dy / dt is the charging current of the target lithium battery, b is a preset constant, and K is the specified maximum charging capacity of the target lithium battery.

4. The lithium battery charging control method according to claim 1, characterized in that: The charging current control curve includes a charging current sequence composed of a plurality of discrete charging current value points.

5. The lithium battery charging control method according to claim 2, characterized in that: The specified maximum charging capacity is a variable with a decreasing gradient during the charging process of the target lithium battery.

6. The lithium battery charging control method according to claim 5, characterized in that: The specified maximum charging capacity decreases gradually in an arithmetic progression.

7. The lithium battery charging control method according to claim 2, characterized in that: The specified maximum charging capacity is a constant value during the charging process of the target lithium battery.

8. The lithium battery charging control method according to claim 7, characterized in that: The constant value is determined according to the formula K=Q0×p, wherein Q0 is the positive electrode capacity inside the target lithium battery, p is a preset constant, and 0<p≤1.

9. The lithium battery charging control method according to claim 2, characterized in that: The preset constants a and b satisfy: Among them, t K / 2 The charging time corresponding to charging the target lithium battery to half of K.

10. The lithium battery charging control method according to claim 2, characterized in that: The maximum value of the charging current control curve is 11. A battery management device, characterized in that: include: A curve acquisition module, used to acquire a pre-stored charging current control curve whose overall trend is a bell-shaped curve; The current control module is used to control the charging current of the target lithium battery according to the charging current control curve during the charging process of the target lithium battery, so that the charging capacity of the target lithium battery increases with the overall trend of the S-shaped capacity growth curve.

12. A computer device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: When the computer program is executed by the processor, the computer program executes the instructions of the method according to any one of claims 1 to 10.

13. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor of a computer device, the computer program executes the instructions of the method according to any one of claims 1 to 10.

14. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor of a computer device, the computer program executes instructions of the method according to any one of claims 1 to 10.

Images