Battery soaking method, device, system and storage medium

Abstract

An embodiment of the present application provides a battery soaking method, device, system and storage medium. The method includes: determining a target voltage based on battery system parameters of the battery, where the target voltage affects the soaking performance of the electrolyte on the battery electrode; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery; after injecting the electrolyte into the battery and before the electrolyte reacts with the battery electrode, generating a voltage application instruction corresponding to the target voltage; the voltage application instruction is used to apply the target voltage to the battery to improve the soaking performance of the electrolyte on the battery electrode. The embodiments of the present application can achieve convenient and rapid improvement of the battery soaking speed.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery manufacturing, and particularly to a battery infiltration method, device, system and storage medium. Background Art

[0002] Liquid injection is a key process in the production and manufacturing of batteries (such as lithium batteries), which refers to injecting electrolyte into the battery and enabling the electrolyte to fully infiltrate the positive and negative materials and the separator of the battery. Ensuring the effective infiltration of the electrolyte in the battery is of great significance for the safety performance and electrical performance of the battery.

[0003] With the continuous increase in the application scenarios of batteries, the volumetric energy density and mass energy density of batteries are also gradually increasing, which makes the challenges faced by the battery liquid injection process increase significantly, especially the difficulty of infiltrating the electrolyte in the battery is constantly increasing. In this context, how to improve the battery infiltration speed in the battery liquid injection process has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, the embodiments of the present application provide a battery infiltration method, device, system and storage medium, so that the electrolyte can infiltrate the battery electrode sheet conveniently and quickly, and the battery infiltration speed can be improved.

[0005] To solve the above problems, the embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, the embodiments of the present application provide a battery infiltration method, including:

[0007] Based on the battery system parameters of the battery, determine a target voltage, where the target voltage affects the infiltration performance of the electrolyte on the battery electrode sheet; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery;

[0008] After injecting the electrolyte into the battery and before the electrolyte reacts with the battery electrode sheet, generate a voltage application instruction corresponding to the target voltage; the voltage application instruction is used to apply the target voltage to the battery to improve the infiltration performance of the electrolyte on the battery electrode sheet.

[0009] Optionally, the battery includes a first electrode and a second electrode; generating the voltage application instruction corresponding to the target voltage includes:

[0010] Generate a voltage application instruction for applying the target voltage to the first electrode and the second electrode;

[0011] Among them, after the first electrode applies a target voltage, it is accompanied by a first charge, and after the second electrode applies a target voltage, it is accompanied by a second charge; the first electrode with the first charge attracts the first ions to move to the first electrode; the second electrode with the second charge attracts the second ions to move to the second electrode.

[0012] Optionally, the first electrode is the positive electrode, and the second electrode is the negative electrode; the first charge is a negative charge, and the second charge is a positive charge; the first ions are cations, and the second ions are anions.

[0013] Optionally, the representation of the wettability includes the contact angle;

[0014] The smaller the contact angle, the better the wettability of the electrolyte to the electrode or separator of the battery.

[0015] Optionally, determining the target voltage based on the battery system parameters of the battery includes:

[0016] Determine the voltage application range under the battery system parameters according to the relationship between the battery voltage corresponding to the battery system parameters of the battery and the battery wetting degree; select the target voltage according to the voltage application range.

[0017] Alternatively, determine the voltage application range corresponding to the battery system parameters of the battery from a preset set of voltage application ranges; select the target voltage from the determined voltage application range; the set of voltage application ranges records the voltage application ranges corresponding to multiple battery system parameters, where the voltage application range under one battery system parameter is determined based on the relationship between the battery voltage corresponding to the battery system parameter and the battery wetting degree.

[0018] Optionally, the voltage application range corresponding to the battery system parameters of the battery is 0V to 2V or -2V to 0V; the absolute value of the target voltage is 0.1V.

[0019] Optionally, the application method of the target voltage is constant voltage pressurization or pulse pressurization.

[0020] Optionally, the battery system parameters include: the ambient temperature of battery liquid injection, the operating pressure, the battery structure, the electrode parameters, the electrolyte parameters, the separator, and the interaction parameters between the electrode or separator and the electrolyte.

[0021] Optionally, the battery system parameters are the first battery system parameters, the battery structure in the first battery system parameters is a wound battery, and the positive electrode in the electrode parameters is a ternary material NMC622 material;

[0022] Among them, under the first battery system parameters, when no target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode is the first time; when a target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode is the second time; the second time is less than the first time.

[0023] Optionally, the battery system parameters are the second battery system parameters, the battery structure in the second battery system parameters is a laminated battery, and the positive electrode in the electrode parameters is made of lithium iron phosphate (LFP) material;

[0024] Under the second battery system parameters, when no target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode is the third time; when a target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode is the fourth time;

[0025] Among them, the fourth time is less than the third time, and the fourth time is less than the second time; the second time is the time taken for the electrolyte in the battery to wet the battery electrode when a target voltage is applied to the battery corresponding to the first battery system parameters under the first battery system parameters. The battery structure in the first battery system parameters is a wound battery, and the positive electrode in the electrode parameters is made of NMC622 material; the other parameters in the first battery system parameters and the second battery system parameters are the same except for the battery structure and the electrode parameters.

[0026] In a second aspect, an embodiment of the present application further provides a battery wetting device, including:

[0027] A determination module, configured to determine a target voltage based on the battery system parameters of the battery, where the target voltage affects the wetting performance of the electrolyte on the battery electrode; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery;

[0028] A processing module, configured to generate a voltage application instruction corresponding to the target voltage after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode; the voltage application instruction is used to apply the target voltage to the battery to improve the wetting performance of the electrolyte on the battery electrode.

[0029] In a third aspect, an embodiment of the present application further provides a battery wetting system, including at least a data processing device and a voltage application device;

[0030] The data processing device is configured to determine a target voltage based on the battery system parameters of the battery, and the target voltage affects the wetting performance of the electrolyte on the battery electrode; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery; after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode, a voltage application instruction corresponding to the target voltage is generated;

[0031] The voltage application device is configured to apply the target voltage to the battery under the control of the voltage application instruction to improve the wetting performance of the electrolyte on the battery electrode.

[0032] In a fourth aspect, an embodiment of the present application further provides a storage medium storing one or more computer-executable instructions for executing the battery wetting method described in the first aspect above.

[0033] In the battery wetting method provided by the embodiment of the present application, a target voltage is determined based on the determined battery system parameters, and the target voltage affects the wetting performance of the electrolyte on the battery electrode; then, after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode, a voltage application instruction corresponding to the target voltage is generated; the voltage application instruction is used to apply the target voltage to the battery to improve the wetting performance of the electrolyte on the battery electrode.

[0034] It can be seen that, in the case where the battery system parameters of the battery are determined, the embodiment of the present application can determine a target voltage that affects the wetting performance of the electrolyte on the battery electrode based on the battery system parameters, so that after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode, a voltage application instruction corresponding to the target voltage is generated for applying the target voltage to the battery to improve the wetting performance of the electrolyte on the battery electrode. Since the embodiment of the present application can apply the target voltage to the battery based on the voltage application instruction to improve the wetting performance of the electrolyte on the battery electrode and increase the battery wetting speed, it can more conveniently and quickly increase the battery wetting speed and avoid the problems of cumbersome implementation process and high equipment cost caused by using equipment such as high-temperature ovens, pressurization, and vacuum to increase the battery wetting speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0036] Figure 1 It is an optional schematic diagram of the battery filling process.

[0037] Figure 2 It is an optional flowchart of the battery soaking method provided by the embodiment of the present application.

[0038] Figure 3 It is a schematic cross-sectional view of the electrode core of the battery.

[0039] Figure 4 It is a schematic diagram of the surface morphologies of different materials of the battery electrode and the separator.

[0040] Figure 5 It is a schematic diagram of the contact angle of the electrolyte with different surfaces.

[0041] Figure 6 It is a schematic diagram of the movement state of ions in the electrolyte before and after applying the target voltage to the battery provided by the embodiment of the present application.

[0042] Figure 7A It is a schematic diagram of the soaking situation of the battery without applying voltage provided by the embodiment of the present application.

[0043] Figure 7B It is a schematic diagram of the soaking situation of the battery after applying voltage provided by the embodiment of the present application.

[0044] Figure 8A It is a schematic diagram of another soaking situation of the battery without applying voltage provided by the embodiment of the present application.

[0045] Figure 8B It is a schematic diagram of another soaking situation of the battery after applying voltage provided by the embodiment of the present application.

[0046] Figure 8C It is a disassembled comparison schematic diagram of the soaking situation of the electrode before and after applying voltage provided by the embodiment of the present application.

[0047] Figure 9 It is an optional block diagram of the battery soaking device provided by the embodiment of the present application.

[0048] Figure 10 It is an optional structural schematic diagram of the battery soaking system provided by the embodiment of the present application. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0050] As a substance responsible for conducting ions between the positive and negative electrodes in a battery, the electrolyte plays a very important role in the battery cycle. Its interaction with each component in the battery (such as the positive electrode, negative electrode, and separator) has an important impact on the performance of the battery. In the battery filling process, the electrolyte will diffuse into the gaps between the electrode sheets and diaphragms, the electrodes, and the pores inside the diaphragms within a certain period of time. This process is called infiltration. If the electrolyte infiltration in the battery is uneven, it will not only lead to uneven battery reactions, but also cause phenomena such as side reactions during long-term charge and discharge cycles of the battery, seriously affecting the safety of the battery. Therefore, the effective infiltration of the electrolyte in the battery is of great significance for the safety performance and electrical performance of the battery.

[0051] However, with the improvement of the battery energy density, the increase in the density and thickness of the electrode materials, etc., the difficulty of electrolyte infiltration continues to increase, and the battery infiltration speed decreases. Based on this, in an alternative example, as Figure 1 shown in the optional schematic diagram of the battery filling process, the battery cell is placed in a high-temperature oven (not shown in the figure), and while injecting the electrolyte into the battery placed in the filling chamber, nitrogen N2 can be used for pressurization. Moreover, a vacuum device is used to evacuate the filling chamber to a vacuum state, thereby performing battery infiltration and improving the battery infiltration speed. However, the inventor found that for battery cells with a large capacity and electrode materials with poor infiltration performance, such as lithium iron phosphate LFP and other materials, Figure 1 in the shown method, using a high-temperature oven and N2 pressurization and a vacuum device for battery infiltration can, to a certain extent, improve the battery infiltration speed, but the equipment cost is relatively high and the implementation process is also relatively cumbersome.

[0052] It can be seen that it is particularly necessary to provide a convenient and fast battery infiltration solution.

[0053] In view of this, the embodiment of the present application proposes an improved battery infiltration scheme, based on the determination of the battery system parameters, determining the target voltage that affects the wetting performance of the electrolyte on the battery pole piece, and then generating a voltage application instruction corresponding to the target voltage after the electrolyte is injected into the battery and before the electrolyte reacts with the battery pole piece, and the voltage application instruction is used to apply the target voltage to the battery to improve the wetting performance of the electrolyte on the battery pole piece, so that the battery infiltration speed is increased. Moreover, based on applying the target voltage, the wetting performance of the electrolyte on the battery pole piece is affected, which can more conveniently improve the battery infiltration speed, avoiding the problems of cumbersome implementation process and high equipment cost caused by using high-temperature ovens and pressurization and vacuum equipment to improve the battery infiltration speed.

[0054] Figure 2 The optional flow chart of the battery soaking method of the embodiment of the present application is shown as an example. Figure 2 As shown, the following steps may be included:

[0055] Step S21: Based on the battery system parameters of the battery, a target voltage is determined, wherein the target voltage affects the wetting performance of the electrolyte on the battery electrode.

[0056] The battery can be understood as a semi-finished battery. In a specific example, the battery can include a shell and a pole piece core, wherein the pole piece core is installed inside the shell. The pole piece core can be formed by winding pole pieces that have undergone a baking process, or can be formed by stacking pole pieces that have undergone a baking process. This application does not make specific limitations here. The pole piece core includes a diaphragm, a positive pole piece, and a negative pole piece. In an optional example, Figure 3 It is a schematic diagram of the cross section of the battery electrode core, as shown in Figure 3 As shown, the pole sheet core of the battery can be stacked or layered and wound according to the structure of the separator, the negative electrode sheet, the separator and the positive electrode sheet. Among them, the battery with the pole sheet core formed by layered winding is called a wound battery, and the battery with the pole sheet core formed by stacked winding is called a stacked battery.

[0057] The battery system parameters refer to the parameter information related to the manufacture of the battery, such as battery structure, electrolyte parameters, etc. During the battery filling process, the infiltration process of the electrolyte mainly relies on the capillary action of the electrolyte in the battery voids to complete the diffusion between the electrodes and the separator. Under different battery system parameters, the reaction degrees of the positive and negative electrode plates or the separator of the battery with the electrolyte are different, which also makes the infiltration performance of the electrolyte on the battery electrode plates different. Among them, the infiltration performance of the electrolyte on the battery electrode plate refers to the infiltration speed corresponding to the contact between the electrolyte and the battery electrode plate until the electrolyte completely infiltrates the battery electrode plate. Since the electrolyte itself is an electrolyte and contains freely moving cations and anions, in the embodiments of the present application, by applying a voltage, an additional charge is attached to the surface of the battery electrode, thereby affecting the movement of the cations and anions in the electrolyte, so as to improve the infiltration performance of the electrolyte on the electrode surface under the action of electrostatic force. The applied voltage can be called the target voltage. Therefore, based on the battery system parameters of the battery, the target voltage can be determined, and the target voltage affects the infiltration performance of the electrolyte on the battery electrode plate. Among them, when the battery system parameters of the battery are determined, the target voltage can be determined from the voltage application range corresponding to the battery system parameters, and moreover, the voltage application range can be determined based on the battery system parameters of the battery.

[0058] Step S22: After injecting the electrolyte into the battery and before the electrolyte reacts with the battery electrode plate, generate a voltage application instruction corresponding to the target voltage.

[0059] Among them, the voltage application instruction is used to apply the target voltage to the battery to improve the infiltration performance of the electrolyte on the battery electrode plate. After applying the target voltage to the battery according to the voltage application instruction, under the action of the target voltage, a charge can be attached to the surface of the battery electrode plate of the battery, so that the cations and anions in the electrolyte are affected by the charge attached to the surface of the battery electrode plate and quickly contact the battery electrode plate, thereby realizing the improvement of the infiltration performance of the electrolyte on the battery electrode plate and enabling the battery electrode plate to be quickly infiltrated by the electrolyte.

[0060] In some embodiments, the infiltration performance can be represented by the contact angle. Among them, the smaller the contact angle, the better the infiltration of the electrolyte on the electrode plate or the separator of the battery. In an optional example, Figure 4 is a schematic diagram of the surface morphologies of different materials of the battery electrode plate and the separator, such as Figure 4As shown, the materials of the positive electrode plate (shown as Anode in the figure) and the negative electrode plate (shown as Cathode in the figure) are different, and the particle sizes are different; the surface morphologies of the PE separator (shown as PE in the figure), the PE separator coated with alumina (AAO) (shown as Coated PE-AAO side in the figure), and the PE separator coated with polyvinylidene fluoride (PVDF) (shown as Coated PE-PVDF side in the figure) are different, but the particle sizes are the same.

[0061] Corresponding to Figure 4 Regarding the surface morphologies of the battery electrode plates and separators shown, there will be contact angles when the electrolyte comes into contact with the surfaces of materials such as the positive electrode plate, negative electrode plate, and separator in the battery. Taking the lithium hexafluorophosphate-containing lithium-ion electrolyte as an example, Figure 5 Exemplarily shows a schematic diagram of the contact angles of the electrolyte with different surfaces. As Figure 5 shown, the gray lines are respectively the liquid tangents of the electrolyte with the interfaces of different materials of the battery, and the included angles formed by the two gray lines are respectively expressed as the contact angle of the electrolyte with the positive electrode material (Anode) (the angle is 5.1°), the contact angle of the electrolyte with the negative electrode material (Cathode) (the angle is 7.9°), the contact angle of the electrolyte with aluminum (Al) (the angle is 42.4°), the contact angle of the electrolyte with copper (Cu) (the angle is 55.6°), the contact angle of the electrolyte with the PE separator (PE) (the angle is 36.9°), and the contact angle of the electrolyte with the PE separator coated with alumina (AAO) (Coated PE-AAO) (the angle is 10.3°) and the contact angle of the electrolyte with the PE separator coated with polyvinylidene fluoride (PVDF) (Coated PE-PVDF) (the angle is 32.1°). Referring to Figure 5 , it can be determined that the contact angles of the same electrolyte with different material surfaces are different. Among them, the contact angles of the positive electrode material and the negative electrode material of the battery are smaller, that is, the positive electrode material and the negative electrode material of the battery are easily wetted; the wettability of the battery separator is directly related to its surface material.

[0062] It can be understood that after injecting the electrolyte into the battery, the electrolyte first fills the voids inside the battery, contacts the positive and negative current collectors exposed inside the battery to be tested. The cations and anions in the electrolyte adhere to the surfaces of the positive and negative current collectors. As the wetting degree increases, the electrolyte can react with and contact the positive and negative electrode plates through the separator of the battery core. Moreover, as time goes by, the electrolyte fully wets the positive and negative electrode plates of the battery, and the wetting state of the battery reaches complete wetting. Among them, the less time it takes for the battery to reach the complete wetting state from the initial liquid injection, the faster the wetting speed of the battery. On the contrary, the slower the wetting speed of the battery. Therefore, it can be determined that the wetting performance of the electrolyte on the battery electrode plates can reflect the wetting speed of the battery. Thus, when the wetting performance of the electrolyte on the battery electrode plates is improved, the wetting speed of the battery is increased.

[0063] It should be noted that in the embodiment of the present application, the best timing for generating the voltage application instruction corresponding to the target voltage for applying the target voltage to the battery is after injecting the electrolyte into the battery and before the battery electrode plates react with the electrolyte, so as to avoid generating the voltage application instruction to apply the target voltage when injecting the electrolyte, which may affect the reaction between the battery electrode plates and the electrolyte.

[0064] It can be seen that in the embodiment of the present application, when the battery system parameters of the battery are determined, based on the battery system parameters, the target voltage affecting the wetting performance of the electrolyte on the battery electrode plates can be determined, and then the target voltage is applied to the battery injected with the electrolyte, so that the electrolyte in the battery is fully wetted, realizing the improvement of the battery wetting speed. And based on applying the target voltage to affect the wetting performance of the electrolyte on the battery electrode plates, it can more conveniently improve the battery wetting speed, avoiding the problems such as the cumbersome implementation process and high equipment cost caused by using high-temperature ovens and equipment such as pressurization and vacuum to improve the battery wetting speed.

[0065] In some embodiments, the battery may include a first electrode and a second electrode. Then, the voltage application instruction corresponding to the target voltage may be to generate a voltage application instruction for applying the target voltage to the first electrode and the second electrode. Thus, under the indication of the voltage application instruction, the target voltage is applied to the first electrode and the second electrode, so that the first electrode has a first charge after the target voltage is applied, and the second electrode has a second charge after the target voltage is applied. Moreover, the first electrode with the first charge attracts the first ions to move to the first electrode, and the second electrode with the second charge attracts the second ions to move to the second electrode. In an alternative example, applying the target voltage to the first electrode and the second electrode may be continuously applied during the soaking process of the battery until the soaking state of the battery reaches complete soaking. And, to facilitate controlling the soaking degree of the battery, the soaking degree of the battery can be detected simultaneously during the soaking process of the battery. It should be noted that the above example is only an alternative example, and the specific application time of the target voltage is not limited in the embodiments of the present application and can be set according to actual needs.

[0066] As an alternative implementation, the first electrode may be the positive electrode, the second electrode may be the negative electrode, then the first charge may be a negative charge, the second charge may be a positive charge, the first ions may be cations, and the second ions may be anions.

[0067] It should be noted that the above example is only an alternative implementation. The first electrode may also be the negative electrode, the second electrode may be the positive electrode, then the first charge may be a positive charge, the second charge may be a negative charge, the first ions may be anions, and the second ions may be cations. The embodiments of the present application do not limit this.

[0068] To facilitate understanding of the above content, take an Al-Cu battery injected with electrolyte as an example, where Cu is the positive electrode and Al is the negative electrode. Figure 6 This is a schematic diagram of the movement state of ions in the electrolyte before and after applying the target voltage to the battery in the embodiments of the present application. As Figure 6As shown, before applying the target voltage (left figure), the ions (i.e., cations and anions) in the electrolyte are in a free movement state, and the reaction with the positive electrode plate (the position marked as Copper in the figure) and the negative electrode plate (the position marked as Aluminum in the figure) of the battery is not obvious, and the wetting performance of the electrolyte on the battery electrode plate is poor. When the target voltage is applied to the battery (right figure), the positive electrode plate of the battery is attached with negative charges. Then, the cations in the electrolyte are attracted by the negative charges and actively move towards the positive electrode plate, enabling the cations to move to the positive electrode plate within the shortest distance and come into contact with the positive electrode plate. Thereby, the contact angle between the electrolyte and the positive electrode material is changed, thus improving the wetting performance of the electrolyte on the positive electrode plate and enhancing the wetting speed. Similarly, the negative electrode plate of the battery is attached with positive charges, and the anions in the electrolyte are attracted by the negative charges and actively move towards the negative electrode plate, enabling the anions to move to the negative electrode plate within the shortest distance and come into contact with the negative electrode plate. Thereby, the contact angle between the electrolyte and the negative electrode material is changed, thus improving the wetting performance of the electrolyte on the negative electrode plate and enhancing the wetting speed.

[0069] In some embodiments, since there is a specific corresponding relationship between the battery voltage and the battery wetting degree during the battery wetting process when the battery system parameters are determined, the voltage application range under the battery system parameters can be obtained through empirical analysis or through experimental testing. Thus, in the process of determining the target voltage based on the battery system parameters of the battery, as an optional implementation, the voltage application range under the battery system parameters can be determined according to the relationship between the battery voltage corresponding to the battery system parameters and the battery wetting degree; and then the target voltage can be selected according to the voltage application range. As another optional implementation, a voltage application range set can be preset. The voltage application range set records the voltage application ranges corresponding to multiple battery system parameters. Among them, the voltage application range under one battery system parameter is determined based on the relationship between the battery voltage corresponding to the battery system parameter and the battery wetting degree. Then, the voltage application range corresponding to the battery system parameters of the battery can be determined from the preset voltage application range set, and the target voltage can be selected from the determined voltage application range.

[0070] In some further embodiments, the voltage application range corresponding to the battery system parameters of the battery can be 0V to 2V or -2V to 0V. In a preferred example, the voltage application range can be 0.1V to 1V or -1V to -0.1V. Selecting the target voltage according to the voltage application range, in a preferred example, the absolute value of the target voltage is 0.1V, that is, the target voltage is 0.1V or -0.1V.

[0071] In some embodiments, based on the environmental equipment conditions during battery liquid injection, the application method of the target voltage can be constant voltage pressurization or pulsed pressurization. As an alternative implementation, when the environmental equipment for battery liquid injection is a battery cycling device, the application method of the target voltage is pulsed pressurization; as another alternative implementation, when the environmental equipment for battery liquid injection is a constant voltage device, the application method of the target voltage is constant voltage pressurization.

[0072] It should be noted that the above examples are only alternative implementations. In actual applications, the application method of the target voltage can be selected according to actual needs, and the embodiments of the present application do not limit this.

[0073] In some embodiments, the battery system parameters of the battery can include the environmental temperature during battery liquid injection, the operating pressure, the battery structure, the electrode sheet parameters, the electrolyte parameters, the separator, and the interaction parameters between the electrode sheet or the separator and the electrolyte. Among them, the battery structure refers to the structural form of the battery core, such as a stacked structure or a wound structure; the electrode sheet parameters refer to the materials of the positive and negative electrode sheets of the battery. For example, the positive electrode sheet material is NCM523 in ternary materials, and the negative electrode sheet material is graphite material; the electrolyte parameters refer to the composition of the electrolyte solution. For example, it contains a lithium hexafluorophosphate-based lithium ion electrolyte; the separator refers to the separator material used in the battery, such as a PE separator; the interaction parameters between the electrode sheet or the separator and the electrolyte refer to the degree of interaction between the positive and negative electrode sheets or the separator of the battery and the electrolyte. The interactions include, for example, specific adsorption, van der Waals force, electrostatic force, hydrogen bond, chemical bond, etc.

[0074] As an alternative implementation, the battery system parameters of the battery can be the first battery system parameters. Among them, the battery structure in the first battery system parameters is a wound battery, and the positive electrode sheet in the electrode sheet parameters is a ternary material (NMC622) material.

[0075] In a specific example, the first battery system parameters can specifically include: a wound battery with a capacity of 1 Ah, a positive electrode of NMC622, a negative electrode of graphite, a PE separator, electrolyte composition: 1 M LiPF6 (EC / DMC / EMC) (volume ratio 1:1:1), and an additive of 1 wt% VC. Figure 7A An exemplary schematic diagram of the battery wetting situation without voltage application is shown. Among them, under the first battery system parameters, the target voltage is not applied to the battery, and wetting is achieved by static placement. As Figure 7A shown, the wetting states of the battery after static placement for 12 h (hours), 24 h (hours), and 36 h (hours) are respectively shown. And, when the target voltage is not applied to the battery, the time taken for the electrolyte to wet the battery electrode sheet can be the first time. Specifically, the first time can be the time taken for the electrolyte to completely wet the battery electrode sheet. Correspondingly Figure 7A , Figure 7BAn exemplary schematic diagram of the battery wetting situation after applying a voltage is shown, where the applied voltage is the target voltage of 0.1V. As Figure 7B shown, the wetting states of the battery standing for 12h (hours), 24h (hours), and 36h (hours) are respectively shown. And when a target voltage is applied to the battery, the time taken for the electrolyte to wet the battery electrode can be the second time. Specifically, the second time can be the time taken for the electrolyte to completely wet the battery electrode.

[0076] Combined with Figure 7A and Figure 7B it can be determined that the second time is less than the first time, that is, when a target voltage is applied to the battery, the time taken for the electrolyte to wet the battery electrode is less than the time taken for the electrolyte to wet the battery electrode without applying a target voltage to the battery. It can be understood that the wettability of the PE separator is poor. By applying a target voltage to the battery, the diffusion of the electrolyte between the electrodes is promoted, and the wettability of the electrolyte is improved.

[0077] As another alternative implementation, the battery system parameters of the battery can be the second battery system parameters, where the battery structure in the second battery system parameters is a stacked battery, and the positive electrode in the electrode parameters is made of lithium iron phosphate (LFP) material.

[0078] In a specific example, the second battery system parameters can specifically include: a stacked battery with a capacity of 3.1Ah, a positive electrode of LFP, a negative electrode of graphite, a PE separator, an electrolyte composition: 1M LiPF6 (EC / DMC / EMC) (volume ratio 1:1:1), and an additive of 1wt% VC. Figure 8A An exemplary schematic diagram of the wetting situation of another battery without applying a voltage is shown, where, under the second battery system parameters, no target voltage is applied to the battery, and wetting is achieved by the standing method. As Figure 8A shown, the wetting states of the battery standing for 1h (hours), 2h (hours), and 12h (hours) are respectively shown. And when no target voltage is applied to the battery, the time taken for the electrolyte to wet the battery electrode can be the third time. Specifically, the third time can be the time taken for the electrolyte to completely wet the battery electrode. Corresponding to Figure 8A the battery wetting time shown, Figure 8B An exemplary schematic diagram of the wetting situation of another battery after applying a voltage is shown, where the applied voltage is the target voltage of 0.1V. As Figure 8B shown, the wetting states of the battery at 1h (hours), 2h (hours), and 12h (hours) are respectively shown. And when a target voltage is applied to the battery, the time taken for the electrolyte to wet the battery electrode can be the fourth time. Specifically, the fourth time can be the time taken for the electrolyte to completely wet the battery electrode.

[0079] Combined withFigure 8A and Figure 8B It can be determined that the fourth time used is less than the third time used, that is, when a target voltage is applied to the battery, the time for the electrolyte to infiltrate the battery electrode is less than the time for the electrolyte to infiltrate the battery electrode without applying the target voltage to the battery. Among them, the wettability of the LFP electrode is poor. To further determine the influence of applying the target voltage on the wettability of the electrolyte on the LFP electrode, Figure 8C is a disassembled comparison schematic diagram of the electrode infiltration before and after applying voltage. As Figure 8C shown, on the left is the infiltration state of the battery electrode after injecting the electrolyte into the battery and being in a static state; on the right is the infiltration state of the battery electrode after injecting the electrolyte into the battery and applying a target voltage of 0.1V, and the voltage application time is the same as the static time in the left figure. Referring to Figure 8C it can be determined that after applying the target voltage to the battery, the speed of the electrolyte infiltrating the LFP electrode increases significantly. That is to say, by applying the target voltage, the diffusion of the electrolyte between the particles of the positive electrode (i.e., the LFP electrode) is enhanced, thereby promoting the improvement of the electrolyte infiltration speed and improving the wettability of the electrolyte on the LFP electrode.

[0080] Furthermore, based on Figure 8B , corresponding to referring to Figure 7B , the fourth time used is less than the second time used, where the second time used is the time for the electrolyte in the battery to infiltrate the battery electrode when applying the target voltage to the battery corresponding to the first battery system parameters under the first battery system parameters. The battery structure in the first battery system parameters is a wound battery, and the positive electrode of the electrode parameters is made of NMC622 material; the other parameters in the first battery system parameters are the same as those in the second battery system parameters except for the battery structure and electrode parameters. Therefore, combining Figure 7B and Figure 8B it can be determined that corresponding to different batteries, the battery system parameters of the batteries are different, and the wettability characteristics are also different. The factors affecting the battery infiltration speed can be electrode materials, diaphragms, electrolytes, etc.

[0081] The battery infiltration solution provided by the embodiments of the present application, under the condition that the battery system parameters of the battery are determined, determines the target voltage based on the battery system parameters. The target voltage affects the wettability of the electrolyte on the battery electrode, so as to generate a voltage application instruction corresponding to the target voltage after injecting the electrolyte into the battery and before the electrolyte reacts with the battery electrode, for applying the target voltage to the battery to improve the wettability of the electrolyte on the battery electrode, so that the battery infiltration speed is increased. Therefore, it can more conveniently and quickly increase the battery infiltration speed, and avoid the problems such as cumbersome implementation process and high equipment cost caused by using high-temperature ovens and equipment such as pressurization and vacuum to increase the battery infiltration speed.

[0082] The battery soaking device provided in the embodiments of the present application will be introduced below. The device content described below can be regarded as a battery soaking device or a computer device, which is a functional module required to implement the battery soaking method provided in the embodiments of the present application. The device content described below can be mutually corresponding and referred to the method content described above.

[0083] Figure 9 The optional block diagram of the battery soaking device provided in the embodiments of the present application is shown. As Figure 9 shown, the device may include:

[0084] A determination module 91, configured to determine a target voltage based on the battery system parameters of the battery, where the target voltage affects the soaking performance of the electrolyte on the battery electrode; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery;

[0085] A processing module 92, configured to generate a voltage application instruction corresponding to the target voltage after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode; the voltage application instruction is used to apply the target voltage to the battery to improve the soaking performance of the electrolyte on the battery electrode.

[0086] In some embodiments, the battery includes a first electrode and a second electrode; the generating a voltage application instruction corresponding to the target voltage includes:

[0087] Generating a voltage application instruction for applying the target voltage to the first electrode and the second electrode;

[0088] Wherein, after the target voltage is applied to the first electrode, a first charge is attached, and after the target voltage is applied to the second electrode, a second charge is attached; the first electrode with the attached first charge attracts the first ions to move to the first electrode; the second electrode with the attached second charge attracts the second ions to move to the second electrode.

[0089] Optionally, the first electrode is a positive electrode, the second electrode is a negative electrode; the first charge is a negative charge, the second charge is a positive charge; the first ions are cations, and the second ions are anions.

[0090] In some embodiments, the representation of the soaking performance includes a contact angle; the smaller the contact angle, the better the soaking property of the electrolyte on the battery electrode or diaphragm.

[0091] In some embodiments, the step of the determination module 91 for determining the target voltage based on the battery system parameters of the battery includes:

[0092] Determine the voltage application range under the battery system parameters according to the relationship between the battery voltage corresponding to the battery system parameters of the battery and the degree of battery wetting; select a target voltage according to the voltage application range.

[0093] Alternatively, determine the voltage application range corresponding to the battery system parameters of the battery from a preset set of voltage application ranges; select a target voltage from the determined voltage application range; the set of voltage application ranges records the voltage application ranges corresponding to multiple battery system parameters, wherein the voltage application range under one battery system parameter is determined based on the relationship between the battery voltage corresponding to the battery system parameter and the degree of battery wetting.

[0094] Optionally, the voltage application range corresponding to the battery system parameters of the battery is 0V to 2V or -2V to 0V; the absolute value of the target voltage is 0.1V.

[0095] Optionally, the application method of the target voltage is constant voltage pressurization or pulse pressurization.

[0096] In some embodiments, the battery system parameters include: the ambient temperature of battery liquid injection, the operating pressure, the battery structure, the electrode sheet parameters, the electrolyte parameters, the separator, and the interaction parameters between the electrode sheet or the separator and the electrolyte.

[0097] As an optional implementation, the battery system parameters are the first battery system parameters, the battery structure in the first battery system parameters is a wound battery, and the positive electrode sheet in the electrode sheet parameters is a ternary material NMC622 material;

[0098] Wherein, under the first battery system parameters, if no target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode sheet is the first time; if a target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode sheet is the second time; the second time is less than the first time.

[0099] As another optional implementation, the battery system parameters are the second battery system parameters, the battery structure in the second battery system parameters is a stacked battery, and the positive electrode sheet in the electrode sheet parameters is a lithium iron phosphate LFP material;

[0100] Under the second battery system parameters, if no target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode sheet is the third time; if a target voltage is applied to the battery, the time taken for the electrolyte in the battery to wet the battery electrode sheet is the fourth time;

[0101] Among them, the fourth time is less than the third time, and the fourth time is less than the second time; the second time is the time taken for the electrolyte in the battery to infiltrate the battery electrode sheet when the target voltage is applied to the battery corresponding to the first battery system parameter under the first battery system parameter, the battery structure in the first battery system parameter is a wound battery, and the positive electrode electrode sheet in the electrode sheet parameter is NMC622 material; the first battery system parameter is the same as the second battery system parameter except for the battery structure and electrode sheet parameters.

[0102] The present application also provides a battery infiltration system. Figure 10 An optional structural diagram of a battery infiltration system according to an embodiment of the present application is shown as an example. Figure 10 As shown, the battery infiltration system may include at least: a data processing device 101 and a voltage applying device 102 .

[0103] The data processing device 101 is used to determine a target voltage based on a battery system parameter of a battery, wherein the target voltage affects the wetting performance of the electrolyte on the battery pole piece; the target voltage is determined from a voltage application range corresponding to the battery system parameter, wherein the voltage application range is determined based on the battery system parameter of the battery; after the battery is injected with an electrolyte and before the battery pole piece of the battery reacts with the electrolyte, a voltage application instruction corresponding to the target voltage is generated;

[0104] The voltage applying device 102 is used to apply the target voltage to the battery under the control of the voltage applying instruction, so as to improve the wetting performance of the electrolyte on the battery electrode.

[0105] An embodiment of the present application further provides a storage medium, wherein the storage medium stores one or more computer executable instructions, and the one or more computer executable instructions are used to execute the above-mentioned battery infiltration method.

[0106] The above describes multiple implementation schemes provided by the embodiments of the present application. The various optional methods introduced in each implementation scheme can be combined and cross-referenced with each other without conflict, thereby extending a variety of possible implementation schemes, which can all be considered as implementation schemes disclosed and open in the embodiments of the present application.

[0107] Although the embodiments of the present application are disclosed above, the present application is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be subject to the scope defined by the claims.

Claims

1. A battery soaking method, characterized in that, Including: Determining a target voltage based on battery system parameters of a battery, where the target voltage is used for charging the surface of a battery electrode of the battery; The battery system parameters refer to parameter information related to the manufacture of the battery, and the target voltage affects the wetting performance of the electrolyte on the battery electrode; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery; After the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode, generating a voltage application command corresponding to the target voltage; the voltage application command is used to apply the target voltage to the battery to improve the wetting performance of the electrolyte on the battery electrode; Among them, determining the target voltage based on the battery system parameters of the battery includes: Determining a voltage application range under the battery system parameters according to the relationship between the battery voltage corresponding to the battery system parameters of the battery and the degree of battery wetting; selecting a target voltage according to the voltage application range; Alternatively, determining a voltage application range corresponding to the battery system parameters of the battery from a preset set of voltage application ranges; selecting a target voltage from the determined voltage application range; the set of voltage application ranges records voltage application ranges corresponding to multiple battery system parameters, where the voltage application range under one battery system parameter is determined based on the relationship between the battery voltage corresponding to the battery system parameter and the degree of battery wetting; Among them, the battery includes a first electrode and a second electrode; generating a voltage application command corresponding to the target voltage includes: Generating a voltage application command for applying the target voltage to the first electrode and the second electrode; Among them, the first electrode is charged with a first charge after applying the target voltage, and the second electrode is charged with a second charge after applying the target voltage; the first electrode charged with the first charge attracts the first ions to move to the first electrode; the second electrode charged with the second charge attracts the second ions to move to the second electrode.

2. The battery soaking method according to claim 1, characterized in that, The first electrode is the positive electrode, and the second electrode is the negative electrode; the first charge is a negative charge, and the second charge is a positive charge; the first ions are cations, and the second ions are anions.

3. The battery soaking method according to claim 1, wherein The representation of the wetting performance includes the contact angle; The smaller the contact angle, the better the wetting property of the electrolyte on the battery electrode or separator.

4. The battery soaking method according to claim 1, characterized in that, The voltage application range corresponding to the battery system parameters of the battery is 0 V to 2 V or -2 V to 0 V; the absolute value of the target voltage is 0.1 V.

5. The battery soaking method according to claim 4, characterized in that, The application method of the target voltage is constant voltage pressing or pulse pressing.

6. The battery soaking method according to claim 1, characterized in that The battery system parameters include: the ambient temperature of battery liquid injection, operating pressure, battery structure, electrode parameters, electrolyte parameters, separator, and the interaction parameters between the electrode or separator and the electrolyte.

7. The battery soaking method according to claim 6, characterized in that, The battery system parameters are the first battery system parameters, the battery structure in the first battery system parameters is a wound battery, and the positive electrode in the electrode parameters is a ternary material NMC622 material; Among them, under the first battery system parameters, when the target voltage is not applied to the battery, the time taken for the electrolyte in the battery to infiltrate the battery electrode is the first time; when the target voltage is applied to the battery, the time taken for the electrolyte in the battery to infiltrate the battery electrode is the second time; the second time is less than the first time.

8. The battery soaking method according to claim 6, characterized in that, The battery system parameters are the second battery system parameters. The battery structure in the second battery system parameters is a laminated battery, and the positive electrode of the electrode parameters is made of lithium iron phosphate (LFP) material. Under the second battery system parameters, when the target voltage is not applied to the battery, the time taken for the electrolyte in the battery to infiltrate the battery electrode is the third time. When the target voltage is applied to the battery, the time taken for the electrolyte in the battery to infiltrate the battery electrode is the fourth time. Among them, the fourth time is less than the third time, and the fourth time is less than the second time; the second time is the time taken for the electrolyte in the battery to infiltrate the battery electrode when the target voltage is applied to the battery corresponding to the first battery system parameters under the first battery system parameters. The battery structure in the first battery system parameters is a wound battery, and the positive electrode of the electrode parameters is made of NMC622 material; the other parameters in the first battery system parameters and the second battery system parameters are the same except for the battery structure and electrode parameters.

9. A battery soaking device, characterized in that, Including: A determination module, configured to determine a target voltage based on the battery system parameters of the battery, where the target voltage is used to attach charges to the surface of the battery electrode. The battery system parameters refer to the parameter information related to the manufacture of the battery. The target voltage affects the infiltration performance of the electrolyte on the battery electrode; the target voltage is determined from the voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery. Determining the target voltage based on the battery system parameters of the battery includes: determining the voltage application range under the battery system parameters according to the relationship between the battery voltage and the battery infiltration degree corresponding to the battery system parameters of the battery; selecting a target voltage according to the voltage application range. Alternatively, determine the voltage application range corresponding to the battery system parameters of the battery from a preset set of voltage application ranges; select a target voltage from the determined voltage application range; the set of voltage application ranges records the voltage application ranges corresponding to multiple battery system parameters, where the voltage application range under one battery system parameter is determined based on the relationship between the battery voltage and the battery infiltration degree corresponding to the battery system parameter. A processing module, configured to generate a voltage application instruction corresponding to the target voltage after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode; the voltage application instruction is used to apply the target voltage to the battery to improve the infiltration performance of the electrolyte on the battery electrode. Among them, the battery includes a first electrode and a second electrode; generating the voltage application instruction corresponding to the target voltage includes: Generating a voltage application instruction for applying the target voltage to the first electrode and the second electrode. Among them, after the first electrode applies a target voltage, it is attached with a first charge, and after the second electrode applies a target voltage, it is attached with a second charge; the first electrode attached with the first charge attracts the first ions to move to the first electrode; the second electrode attached with the second charge attracts the second ions to move to the second electrode.

10. A battery soaking system, characterized in that, It includes at least a data processing device and a voltage application device; The data processing device is configured to determine a target voltage based on the battery system parameters of the battery, and the target voltage is used to attach charges to the surface of the battery electrode; The battery system parameters refer to parameter information related to the manufacture of the battery, and the target voltage affects the wetting performance of the electrolyte on the battery electrode; the target voltage is determined from a voltage application range corresponding to the battery system parameters, and the voltage application range is determined based on the battery system parameters of the battery; determining the target voltage based on the battery system parameters of the battery includes: determining the voltage application range under the battery system parameters according to the relationship between the battery voltage corresponding to the battery system parameters and the battery wetting degree; selecting a target voltage according to the voltage application range; or, determining the voltage application range corresponding to the battery system parameters of the battery from a preset set of voltage application ranges; selecting a target voltage from the determined voltage application range; the set of voltage application ranges records the voltage application ranges corresponding to multiple battery system parameters, wherein the voltage application range under one battery system parameter is determined based on the relationship between the battery voltage corresponding to the battery system parameter and the battery wetting degree; after the electrolyte is injected into the battery and before the electrolyte reacts with the battery electrode, a voltage application instruction corresponding to the target voltage is generated; wherein, the battery includes a first electrode and a second electrode; generating the voltage application instruction corresponding to the target voltage includes: generating a voltage application instruction for applying the target voltage to the first electrode and the second electrode; among them, after the first electrode applies the target voltage, it is attached with a first charge, and after the second electrode applies the target voltage, it is attached with a second charge; the first electrode attached with the first charge attracts the first ions to move to the first electrode; the second electrode attached with the second charge attracts the second ions to move to the second electrode; The voltage application device is configured to be controlled by the voltage application instruction to apply the target voltage to the battery to improve the wetting performance of the electrolyte on the battery electrode.

11. A storage medium, characterized in that, The storage medium stores one or more computer-executable instructions, and the one or more computer-executable instructions are used to execute the battery wetting method according to any one of claims 1-8.

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