Battery impregnation method, battery impregnation device, battery impregnation system, and storage medium

Abstract

The present invention provides a battery infiltration method, device, system, and storage medium, which include: determining a target voltage based on battery system parameters of a battery, the target voltage affecting the infiltration characteristics of an electrolyte into the battery pole pieces, the target voltage being determined from a voltage application range corresponding to the battery system parameters, the voltage application range being determined based on the battery system parameters of the battery; and generating a voltage application command corresponding to the target voltage after injecting an electrolyte into the battery but before the electrolyte reacts with the battery pole pieces, the voltage application command applying the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces. The present invention can easily and quickly improve the infiltration rate of a battery.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION The present application relates to the field of battery manufacturing, and more particularly to a battery infiltration method, a battery infiltration apparatus, a battery infiltration system, and a storage medium. [Background technology]

[0002] Filling is an important process in the production of batteries (e.g., lithium batteries), and refers to injecting electrolyte into the battery to ensure sufficient penetration of the electrolyte into the battery's positive and negative electrodes and separator. Ensuring effective penetration of the electrolyte into the battery is important for the safety and electrical properties of the battery.

[0003] With the increasing application scenarios of batteries, the volumetric energy density and mass energy density of batteries are also gradually increasing, which significantly increases the challenges faced in the battery filling process, especially the difficulty of electrolyte infiltration into batteries. Under this background, how to improve the battery infiltration speed in the battery filling process has become a technical problem that those skilled in the art must solve as soon as possible. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the present application is to provide a battery infiltration method, a battery infiltration device, a battery infiltration system, and a storage medium, which allow the electrolyte to be infiltrated into the battery pole pieces easily and quickly, thereby improving the battery infiltration speed. [Means for solving the problem]

[0005] In a first aspect, embodiments of the present application provide a method of battery infiltration, the method comprising: A target voltage is determined based on a battery system parameter of the battery, the target voltage affects the infiltration characteristics of the electrolyte into the battery pole pieces, the target voltage is determined from a voltage application range corresponding to the battery system parameter, and the voltage application range is determined based on the battery system parameter of the battery; After injecting an electrolyte into the battery and before the electrolyte reacts with the battery pole pieces, a voltage application command corresponding to the target voltage is generated, and the voltage application command is for applying the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces.

[0006] Optionally, the battery includes a first electrode and a second electrode, and generating a voltage application command corresponding to the target voltage comprises: generating a voltage application command to apply the target voltage to the first electrode and the second electrode; When a target voltage is applied to the first electrode, a first charge is generated, and when a target voltage is applied to the second electrode, a second charge is generated, and the first electrode, which has been charged with the first charge, attracts first charged ions to move to the first electrode, and the second electrode, which has been charged with the second charge, attracts second charged ions to move to the second electrode.

[0007] 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 charged ion is a cation, and the second charged ion is an anion.

[0008] Optionally, the expression of the wetting property comprises a contact angle; The smaller the contact angle, the better the electrolyte will wet the battery pole pieces or separator.

[0009] Optionally, determining the target voltage based on battery system parameters of the battery includes: determining a voltage application range for the battery system parameter based on a relationship between a battery voltage corresponding to the battery system parameter and a degree of infiltration of the battery; and selecting a target voltage based on the voltage application range; Alternatively, it includes determining a voltage application range corresponding to a battery system parameter of the battery from a predetermined set of voltage application ranges, selecting a target voltage from the determined voltage application range, recording a plurality of voltage application ranges corresponding to the battery system parameters in the set of voltage application ranges, and determining the voltage application range for one battery system parameter based on the relationship between the battery voltage corresponding to the battery system parameter and the degree of infiltration of the battery.

[0010] As an option, the voltage application range corresponding to the battery system parameters of the battery is 0V to 2V or -2V to 0V, and the absolute value of the target voltage is 0.1V.

[0011] Optionally, the target voltage application method is a constant voltage application or a pulse type voltage application.

[0012] Optionally, the battery system parameters include the temperature of the environment in which the battery is filled, the operating pressure, the battery structure, the pole piece parameters, the electrolyte parameters, the separator, and the interaction parameters between the pole piece or separator and the electrolyte.

[0013] As an option, the battery system parameters are first battery system parameters, the battery structure in the first battery system parameters is a wound-type battery, and the positive electrode piece in the electrode piece parameters is a ternary material NMC622 material; In the first battery system parameter, when a target voltage is not applied to the battery, the time consumed for the electrolyte in the battery to infiltrate the battery pole pieces is a first consumption time, and when a target voltage is applied to the battery, the time consumed for the electrolyte in the battery to infiltrate the battery pole pieces is a second consumption time, and the second consumption time is shorter than the first consumption time.

[0014] As an option, the battery system parameters are second battery system parameters, the battery structure in the second battery system parameters is a stacked battery, and the positive electrode piece in the electrode piece parameters is a lithium iron phosphate LFP material; In the second battery system parameters, when a target voltage is not applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a third consumption time, and when a target voltage is applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a fourth consumption time; the fourth consumption time is shorter than the third consumption time, the fourth consumption time is shorter than the second consumption time, the second consumption time is a consumption time for the electrolyte in the battery to infiltrate the battery pole pieces when a target voltage is applied to the battery corresponding to the first battery system parameters in first battery system parameters, the battery structure in the first battery system parameters is a wound-type battery, the positive pole piece in the pole piece parameters is made of NMC622 material, and the first battery system parameters are the same as other parameters other than the battery structure and pole piece parameters in the second battery system parameters.

[0015] In a second aspect, embodiments of the present application further provide a battery immersion device, the battery immersion device comprising: a determination module for determining a target voltage based on a battery system parameter of the battery, the target voltage affecting the infiltration characteristics of the electrolyte into the battery pole pieces, the target voltage being determined from a voltage application range corresponding to the battery system parameter, the voltage application range being determined based on the battery system parameter of the battery; and a processing module for generating a voltage application command corresponding to the target voltage after an electrolyte is injected into the battery and before the electrolyte reacts with the battery pole pieces, the voltage application command being for applying the target voltage to the battery in order to improve the infiltration characteristics of the electrolyte into the battery pole pieces.

[0016] In a third aspect, embodiments of the present application further provide a battery immersion system, the battery immersion system comprising at least a data processing device and a voltage application device; The data processing device is used for determining a target voltage based on a battery system parameter of a battery, the target voltage affects the infiltration characteristics of an electrolyte into a battery pole piece, the target voltage is determined from a voltage application range corresponding to the battery system parameter, and the voltage application range is determined based on the battery system parameter of the battery; and generating a voltage application command corresponding to the target voltage after injecting an electrolyte into the battery and before the battery pole piece of the battery reacts with the electrolyte; The voltage application device is used to apply the target voltage to the battery under the control of the voltage application command to improve the wetting characteristics of the electrolyte to the battery pole pieces. In a fourth aspect, embodiments of the present application further provide a storage medium having one or more computer-executable instructions stored thereon, the one or more computer-executable instructions being for performing the battery infiltration method described in the first aspect above. [Effects of the Invention]

[0017] Compared with the prior art, the technical solution of this application has the following advantages: In a battery infiltration method according to an embodiment of the present application, when a battery system parameter is determined, a target voltage is determined, and the target voltage affects the infiltration characteristics of the electrolyte into the battery pole pieces. Furthermore, after injecting the electrolyte into the battery and before the battery pole pieces of the battery react with the electrolyte, a voltage application command corresponding to the target voltage is generated, and the voltage application command is used to apply the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces. As can be seen from the above, in an embodiment of the present application, when battery system parameters of a battery are determined, a target voltage that affects the wetting characteristics of the electrolyte in the battery pole pieces may be determined based on the battery system parameters, and then a voltage application command corresponding to the target voltage may be generated after the electrolyte is injected into the battery but before the battery pole pieces of the battery react with the electrolyte, thereby applying the target voltage to the battery to improve the wetting characteristics of the electrolyte in the battery pole pieces.By applying the target voltage to the battery based on the voltage application command, the wetting characteristics of the electrolyte in the battery pole pieces can be improved and the battery wetting rate can be increased, thereby more simply and quickly improving the battery wetting rate and avoiding the problems of using high-temperature ovens and equipment such as pressurization and vacuum to increase the battery wetting rate, which are complicated to achieve and require relatively high equipment costs. [Brief explanation of the drawings]

[0018] [Figure 1] Figure 1 shows an alternative schematic diagram of the battery filling process. [Figure 2] FIG. 2 is an alternative flow chart of a method for infiltrating a battery according to an embodiment of the present application. [Figure 3] FIG. 3 is a cross-sectional schematic diagram of a winding core for a battery pole piece. [Figure 4] FIG. 4 is a schematic diagram showing the surface morphology of different materials for the pole pieces and separator of a battery. [Figure 5] FIG. 5 is a schematic diagram of the contact angle between the electrolyte and different surfaces. [Figure 6] FIG. 6 is a schematic diagram showing the state of movement of charged ions in the electrolyte before and after applying a target voltage to a battery according to an example of the present application. [Figure 7A] FIG. 7A is a schematic diagram showing the state of battery infiltration without applying voltage according to an example of the present application. [Figure 7B] FIG. 7B is a schematic diagram showing the state of cell infiltration after voltage application according to an example of the present application. [Figure 8A] FIG. 8A is a schematic diagram showing another cell infiltration state without applying voltage according to an embodiment of the present application. [Figure 8B] FIG. 8B is a schematic diagram showing another cell infiltration state after voltage application according to an example of the present application. [Figure 8C] FIG. 8C is an exploded comparative schematic diagram showing the infiltration state of the pole piece before and after applying a voltage according to an example of the present application. [Figure 9] FIG. 9 is an alternative block diagram of a battery infiltration device according to an embodiment of the present application. [Figure 10] FIG. 10 is a schematic diagram of an alternative structure of a battery infiltration system according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0019] As the material responsible for conducting ions between the positive and negative electrodes in a battery, the electrolyte plays a crucial role in the battery cycle, and its interactions with each component in the battery (e.g., the positive electrode, negative electrode, and separator) have a significant impact on battery performance. During the battery filling process, the electrolyte diffuses into the gaps between the battery pole pieces and the separator and into the voids inside the electrodes and separator over a certain period of time, a process known as infiltration. Uneven infiltration of the electrolyte in the battery not only leads to uneven battery reactions, but also to side reactions and other phenomena during long-term charge-discharge cycles, severely affecting battery safety. Therefore, effective infiltration of the electrolyte in the battery is crucial for the safety and electrical performance of the battery.

[0020] However, with the improvement of battery energy density and the increase in electrode material density and thickness, the difficulty of electrolyte infiltration has gradually increased, resulting in a decrease in the battery infiltration rate. Based on this, in an optional example, as shown in the optional schematic diagram of the battery infiltration process shown in FIG. 1, a battery cell is placed in a high-temperature oven (not shown), an electrolyte is injected into the battery placed in the infiltration chamber, and the chamber is pressurized with nitrogen gas (N2). A vacuum exhaust device is then used to evacuate the infiltration chamber to a vacuum state, thereby infiltrating the battery and increasing the battery infiltration rate. However, the inventors have discovered that for battery cells with relatively large capacities and electrode materials with relatively poor infiltration characteristics, such as lithium iron phosphate (LFP), using a high-temperature oven and N2 pressure and vacuum device to infiltrate the battery in the manner shown in FIG. 1 can improve the battery infiltration rate to some extent, but the equipment costs are relatively high and the implementation process is more complicated.

[0021] In view of the above, there is a significant need to provide a simple and rapid means of battery infiltration.

[0022] In view of this, the present embodiment provides an improved battery infiltration method, which determines a target voltage that affects the infiltration characteristics of the electrolyte into the battery pole pieces when battery system parameters are determined, and then generates a voltage application command corresponding to the target voltage after the electrolyte is injected into the battery but before the electrolyte reacts with the battery pole pieces, where the voltage application command applies the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces, thereby accelerating the battery infiltration rate. Furthermore, by applying the target voltage to affect the infiltration characteristics of the electrolyte into the battery pole pieces, the battery infiltration rate can be more easily improved, thereby avoiding the problems of using high-temperature ovens and equipment such as pressurization and vacuum to increase the battery infiltration rate, which require complicated processes and relatively high equipment costs.

[0023] An optional flow chart of a battery infiltration method according to an embodiment of the present application is shown in Fig. 2. As shown in Fig. 2, the method may include the following steps S21 and S22. Step S21: Determine a target voltage based on the battery system parameters of the battery, which affects the permeation characteristics of the electrolyte into the battery pole pieces.

[0024] The battery may be understood as a semi-finished battery. In a specific example, the battery may include a case and a pole piece winding core. The pole piece winding core is attached to the inside of the case, and the pole piece winding core may be wound with pole pieces that have undergone a baking process, or may be stacked with pole pieces that have undergone a baking process, but the present application is not specifically limited thereto. The pole piece winding core includes a separator, positive electrode pieces, and negative electrode pieces. In an alternative example, Figure 3 is a cross-sectional schematic diagram of a battery pole piece winding core. As shown in Figure 3, the battery pole piece winding core may be wound in a stacked or laminated manner depending on the structure of the separator, negative electrode pieces, separator, and positive electrode pieces. A battery with a pole piece winding core wound in a laminated manner is called a wound-type battery, and a battery with a pole piece winding core wound in a laminated manner is called a stacked-type battery.

[0025] The battery system parameters refer to parameter information related to battery manufacturing, such as battery structure and electrolyte parameters. During the battery filling process, the electrolyte infiltration process mainly relies on capillary action of the electrolyte in the battery gap to complete diffusion between the electrodes and the separator. Different battery system parameters result in different degrees of reaction between the electrolyte and the positive and negative electrodes or separators, resulting in different infiltration characteristics of the electrolyte into the battery electrodes. The infiltration characteristics of the electrolyte into the battery electrodes refer to the infiltration rate from when the electrolyte contacts the battery electrodes until the electrolyte completely infiltrates the battery electrodes. Because the electrolyte itself belongs to the electrolyte and contains freely mobile anions and cations, the present embodiment applies a voltage to the surfaces of the battery electrodes, thereby affecting the movement of anions and cations in the electrolyte and thereby improving the infiltration characteristics of the electrolyte into the electrode surfaces through the action of Coulomb force. The applied voltage may be referred to as the target voltage. Therefore, a target voltage can be determined based on a battery system parameter of the battery, and the target voltage affects the infiltration characteristics of the electrolyte into the battery pole pieces. When the battery system parameter of the battery is determined, the target voltage can be determined from a voltage application range corresponding to the battery system parameter, and the voltage application range can be determined based on the battery system parameter of the battery.

[0026] Step S22: After the electrolyte is injected into the battery and before the battery pole pieces of the battery react with the electrolyte, a voltage application command corresponding to the target voltage is generated.

[0027] The voltage application command is for applying the target voltage to the battery to improve the wetting properties of the electrolyte in the battery pole pieces. After the target voltage is applied to the battery based on the voltage application command, the target voltage can charge the surfaces of the battery pole pieces of the battery, so that the anions / cations in the electrolyte are influenced by the charges on the surfaces of the battery pole pieces and quickly contact the battery pole pieces, thereby further improving the wetting properties of the electrolyte in the battery pole pieces and allowing the battery pole pieces to be quickly wetting with the electrolyte.

[0028] In some embodiments, the wetting property may be represented by a contact angle. The smaller the contact angle, the better the electrolyte will wet the battery pole piece or separator. In an alternative example, FIG. 4 is a schematic diagram illustrating the surface morphology of different materials for battery pole pieces and separators. As shown in FIG. 4, the positive pole piece (shown as Anode in the figure) and the negative pole piece (shown as Cathode in the figure) are made of different materials and have different particle sizes, while the PE separator (shown as PE in the figure), the PE separator coated with aluminum oxide (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) have different surface morphologies but the same particle size.

[0029] When the electrolyte comes into contact with the surfaces of materials such as the positive electrode pieces, negative electrode pieces, and separator in a battery, a contact angle will exist, corresponding to the surface morphology of the battery electrode pieces and separator shown in Figure 4. Using a lithium ion electrolyte containing lithium hexafluorophosphate as an example, Figure 5 shows a schematic diagram of the contact angles on different surfaces. As shown in Figure 5, the gray lines represent the liquid tangents between the interfaces of different materials in the battery and the electrolyte. The included angles formed by the two gray lines are the contact angle between the electrolyte and the positive electrode material (anode) (5.1°), the contact angle between the electrolyte and the negative electrode material (cathode) (7.9°), the contact angle between the electrolyte and aluminum (Al) (42.4°), the contact angle between the electrolyte and copper (Cu) (55.6°), the contact angle between the electrolyte and the PE separator (PE) (36.9°), the contact angle between the electrolyte and the PE separator coated with aluminum oxide (AAO) (10.3°), and the contact angle between the electrolyte and the PE separator coated with polyvinylidene fluoride (PVDF) (32.1°). Referring to FIG. 5, it can be determined that the contact angles of the same electrolyte with the surfaces of different materials are different, and the contact angles of the positive and negative electrode materials of the battery are relatively small, that is, the positive and negative electrode materials of the battery are easily infiltrated, and there is a direct correlation between the infiltrability of the battery separator and the material of its surface.

[0030] It should be understood that after an electrolyte is injected into a battery, the electrolyte first fills the gaps within the battery and contacts the positive and negative electrode current collectors exposed inside the battery under test. The anions and cations in the electrolyte adhere to the surfaces of the positive and negative electrode current collectors. As the degree of infiltration increases, the electrolyte reacts with and contacts the positive and negative electrode pieces through the separator of the battery winding core. Over time, the electrolyte sufficiently infiltrates the positive and negative electrode pieces of the battery, until the infiltration state of the battery reaches full infiltration. The shorter the time it takes for the battery to reach full infiltration from initial injection, the faster the infiltration rate of the battery; conversely, the slower the infiltration rate of the battery. Therefore, it can be determined that the infiltration characteristics of the electrolyte into the battery electrode pieces can indicate the infiltration rate of the battery, and thus, improved infiltration characteristics of the electrolyte into the battery electrode pieces leads to improved infiltration rate of the battery.

[0031] It should be noted that in the embodiment of the present application, the optimal timing for generating a voltage application command corresponding to the target voltage to apply the target voltage to the battery is after injecting the electrolyte into the battery and before the battery pole pieces of the battery react with the electrolyte, thereby avoiding generating a voltage application command to apply the target voltage when injecting the electrolyte and affecting the reaction between the battery pole pieces and the electrolyte.

[0032] As can be seen from the above, in the embodiments of the present application, once the battery system parameters of a battery are determined, a target voltage that affects the wetting characteristics of the electrolyte into the battery pole pieces can be determined based on the battery system parameters, and the target voltage can then be applied to the battery after the electrolyte has been injected, allowing the electrolyte in the battery to fully wetting the battery pole pieces and improving the battery wetting rate. Furthermore, by applying the target voltage to affect the wetting characteristics of the electrolyte into the battery pole pieces, the battery wetting rate can be more easily improved, thereby avoiding the problems of using high-temperature ovens and equipment such as pressurized and vacuum devices to increase the battery wetting rate, which require complicated processes and relatively high equipment costs.

[0033] In some embodiments, where a battery may include a first electrode and a second electrode, generating a voltage application command corresponding to a target voltage may include generating a voltage application command to apply the target voltage to the first electrode and the second electrode. The target voltage is then applied to the first electrode and the second electrode under the direction of the voltage application command, such that a first charge is applied to the first electrode when the target voltage is applied, a second charge is applied to the second electrode when the target voltage is applied, and the first electrode, which has the first charge, attracts first charged ions to migrate to the first electrode, and the second electrode, which has the second charge, attracts second charged ions to migrate to the second electrode. In an alternative example, applying the target voltage to the first electrode and the second electrode may be continuous during the infiltration process of the battery until the infiltration state of the battery reaches full infiltration. Furthermore, the degree of infiltration of the battery may be simultaneously detected during the infiltration process of the battery to facilitate control of the degree of infiltration of the battery. It should be noted that the above examples are merely selectable examples, and the specific application time of the target voltage is not limited in the embodiments of the present application, and may be set according to actual needs.

[0034] In an alternative implementation, when the first electrode may be a positive electrode and the second electrode may be a negative electrode, the first charge may be a negative charge, the second charge may be a positive charge, the first charged ion may be a cation, and the second charged ion may be an anion.

[0035] It should be noted that the above examples are merely optional implementations, and when the first electrode may be a negative electrode and the second electrode may be a positive electrode, the first charge may be a positive charge, the second charge may be a negative charge, the first charged ion may be an anion, and the second charged ion may be a cation, and the embodiments of the present application are not limited thereto.

[0036] To facilitate understanding of the above, an Al-Cu battery filled with electrolyte is used as an example, with Cu as the positive electrode and Al as the negative electrode. Figure 6 is a schematic diagram showing the movement of charged ions in the electrolyte before and after applying a target voltage to a battery according to an embodiment of the present application. As shown in Figure 6, before the target voltage is applied (left panel), the charged ions (i.e., anions / cations) in the electrolyte are in a free state of movement, and there is no clear reaction with the battery's positive electrode piece (the position marked with Copper in the figure) or negative electrode piece (the position marked with Aluminum in the figure), resulting in relatively poor electrolyte penetration into the battery electrode piece. After applying the target voltage to the battery (right diagram), the battery's positive electrode piece is negatively charged, and the cations in the electrolyte are attracted by the negative charge and spontaneously migrate to the positive electrode piece, causing the cations to migrate to the positive electrode piece within the shortest distance and contact the positive electrode piece, and further changing the contact angle between the electrolyte and the positive electrode material, thereby improving the infiltration characteristics of the electrolyte into the positive electrode piece and accelerating the infiltration rate. Similarly, the battery's negative electrode piece is positively charged, and the anions in the electrolyte are attracted by the negative charge and spontaneously migrate to the negative electrode piece, causing the anions to migrate to the negative electrode piece within the shortest distance and contact the negative electrode piece, and further changing the contact angle between the electrolyte and the negative electrode material, thereby improving the infiltration characteristics of the electrolyte into the negative electrode piece and accelerating the infiltration rate.

[0037] In some embodiments, when the battery system parameters are determined, there is a specific correspondence between the battery voltage and the degree of infiltration of the battery during the infiltration process, and therefore the voltage application range for the battery system parameters can be obtained through empirical analysis or experimental testing. Thus, in the process of determining the target voltage based on the battery system parameters of the battery, an optional implementation may be to determine the voltage application range for the battery system parameters based on the relationship between the battery voltage corresponding to the battery system parameters and the degree of infiltration of the battery, and then select the target voltage based on the voltage application range. Another optional implementation may be to pre-set a voltage application range set, where multiple voltage application ranges corresponding to the battery system parameters are recorded in the voltage application range set, and the voltage application range for one battery system parameter is determined based on the relationship between the battery voltage corresponding to the battery system parameter and the degree of infiltration of the battery, and then determine a voltage application range corresponding to the battery system parameters of the battery from the predetermined voltage application range set, and then select the target voltage from the determined voltage application range.

[0038] In some further embodiments, the applied voltage range corresponding to the battery system parameters of the battery may be 0 V to 2 V or −2 V to 0 V. In a preferred example, the applied voltage range may be 0.1 V to 1 V or −1 V to −0.1 V. A target voltage is selected based on the applied voltage range, and in a preferred example, the absolute value of the target voltage is 0.1 V, i.e., the target voltage is 0.1 V or −0.1 V.

[0039] In some embodiments, depending on the environmental device that fills the battery, the target voltage application method may be a constant voltage application or a pulse-type voltage application. In an alternative implementation, if the environmental device that fills the battery is a battery cycling device, the target voltage application method is a pulse-type voltage application. In another alternative implementation, if the environmental device that fills the battery is a constant voltage device, the target voltage application method is a constant voltage voltage application.

[0040] It should be noted that the above example is merely an optional implementation, and the target voltage application method may be selected according to actual needs in actual applications, and the embodiments of the present application are not limited thereto.

[0041] In some embodiments, the battery system parameters of the battery may include the ambient temperature of the battery when filled with electrolyte, the operating pressure, the battery structure, the pole piece parameters, the electrolyte parameters, the separator, and the interaction parameters between the pole pieces or the separator and the electrolyte. The battery structure refers to the structural type of the battery winding core, such as a stacked structure or a wound structure. The pole piece parameters refer to the positive and negative pole piece materials of the battery, such as the positive pole piece material being NCM523 in a ternary material and the negative pole piece material being graphite. The electrolyte parameters refer to the solution components of the electrolyte, such as a lithium ion electrolyte containing lithium hexafluorophosphate. The separator refers to the separator material used in the battery, such as a PE separator. The interaction parameters between the pole pieces or the separator and the electrolyte refer to the degree of interaction between the positive and negative pole pieces or the separator of the battery and the electrolyte, such as specific adsorption, van der Waals forces, Coulomb forces, hydrogen bonds, chemical bonds, etc.

[0042] As an alternative implementation, the battery system parameters of the battery may be first battery system parameters, in which the battery structure in the first battery system parameters is a wound-type battery, and the positive electrode piece in the electrode piece parameters is a ternary material (NMC622).

[0043] In a specific example, the first battery system parameters may include a wound-type battery with a capacity of 1 Ah, a positive electrode made of NMC622, a negative electrode made of graphite, a separator made of PE, and electrolyte components of 1M LiPF6 (EC / DMC / EMC) (volume ratio 1:1:1), with 1 wt% VC as an additive. FIG. 7A shows a schematic diagram illustrating a battery infiltration state without voltage application. In the first battery system parameters, no target voltage is applied to the battery, and infiltration is achieved by static infiltration. As shown in FIG. 7A, the infiltration states are shown for 12 hours, 24 hours, and 36 hours, respectively. When no target voltage is applied to the battery, the consumed time for infiltrating the battery pole pieces with the electrolyte may be the first consumed time. Corresponding to the battery infiltration time shown in FIG. 7A, FIG. 7B shows a schematic diagram illustrating a battery infiltration state after voltage application, where the applied voltage is the target voltage of 0.1 V. As shown in FIG. 7B, the infiltration states are shown in which the battery is left standing for 12 hours, 24 hours, and 36 hours, respectively, and when a target voltage is applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte may be the second consumption time.

[0044] 7A and 7B, the second consumption time is shorter than the first consumption time, i.e., the consumption time for the electrolyte to infiltrate the battery pole pieces when the target voltage is applied to the battery is shorter than the consumption time for the electrolyte to infiltrate the battery pole pieces when the target voltage is not applied to the battery. As can be seen, the PE separator has relatively poor permeability, and applying the target voltage to the battery promotes the diffusion of the electrolyte between the electrodes, improving the permeability of the electrolyte.

[0045] As another alternative implementation, the battery system parameters of the battery may be second battery system parameters, in which the battery structure in the second battery system parameters is a stacked battery, and the positive electrode piece in the electrode piece parameters is a lithium iron phosphate (LFP) material.

[0046] In a specific example, the second battery system parameters may include a stacked battery with a capacity of 3.1 Ah, a positive electrode made of LFP, a negative electrode made of graphite, a separator made of PE, and electrolyte components made of 1M LiPF6 (EC / DMC / EMC) (volume ratio 1:1:1), with 1 wt% VC as an additive. FIG. 8A shows a schematic diagram illustrating another battery infiltration state without voltage application. In the second battery system parameters, no target voltage is applied to the battery, and infiltration is achieved by static infiltration. As shown in FIG. 8A, the infiltration states are shown for 1 h (hour), 2 h (hour), and 12 h (hour), respectively. When no target voltage is applied to the battery, the consumed time for infiltrating the battery pole pieces with electrolyte may be a third consumed time. Corresponding to the battery infiltration times shown in FIG. 8A, FIG. 8B shows a schematic diagram illustrating another battery infiltration state after voltage application, where the applied voltage is the target voltage of 0.1 V. As shown in FIG. 8B, the infiltration state of the battery at 1 h (hour), 2 h (hour), and 12 h (hour) are shown, and when a target voltage is applied to the battery, the consumption time for the electrolyte to infiltrate the battery pole piece may be the fourth consumption time.

[0047] 8A and 8B, the fourth consumption time is shorter than the third consumption time, i.e., the consumption time for the electrolyte to infiltrate the battery electrode pieces when the target voltage is applied to the battery is shorter than the consumption time for the electrolyte to infiltrate the battery electrode pieces when the target voltage is not applied to the battery. To further determine the relatively poor infiltration of the LFP electrode and the effect of applying the target voltage on the infiltration characteristics of the electrolyte into the LFP electrode, FIG. 8C shows a comparative exploded view of the infiltration of the electrode pieces before and after voltage application. As shown in FIG. 8C, after the target voltage is applied to the battery, the infiltration rate of the electrolyte into the LFP electrode is significantly increased. That is, applying the target voltage enhances the diffusion of the electrolyte between particles of the positive electrode (i.e., the LFP electrode), further promoting the increase in the infiltration rate of the electrolyte and improving the infiltration characteristics of the electrolyte into the LFP electrode.

[0048] Further, based on Figure 8B and correspondingly referring to Figure 7B, the fourth consumption time is shorter than the second consumption time, the second consumption time is the consumption time for the battery electrode pieces to be infiltrated by the electrolyte in the battery when a target voltage is applied to the battery corresponding to the first battery system parameters, the battery structure according to the first battery system parameters is a wound-type battery, the positive electrode piece according to the electrode piece parameters is made of NMC622 material, and the first battery system parameters are the same as the other parameters other than the battery structure and electrode piece parameters according to the second battery system parameters. Figures 7B and 8B can be determined together because different batteries have different battery system parameters and different infiltration characteristics, and factors affecting the battery infiltration rate may be electrode material, separator, electrolyte, etc.

[0049] The battery infiltration means of the embodiment of the present application, when the battery system parameters of the battery are determined, determines a target voltage based on the battery system parameters, and the target voltage affects the infiltration characteristics of the electrolyte into the battery pole pieces. Therefore, after the electrolyte is injected into the battery and before the battery pole pieces of the battery react with the electrolyte, generates a voltage application command corresponding to the target voltage, which is used to apply the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces, thereby accelerating the battery infiltration rate, and therefore, more simply and quickly improving the battery infiltration rate, and avoiding the problems of complex implementation processes and relatively high equipment costs caused by using high-temperature ovens and equipment such as pressurization and vacuum to increase the battery infiltration rate.

[0050] The following describes a battery impregnation device according to an embodiment of the present application. The device contents described below may be considered as a battery impregnation device or a computer device, and are functional modules that must be installed to realize the battery impregnation method according to an embodiment of the present application. The device contents described below and the method contents described above may be referenced correspondingly.

[0051] An alternative block diagram of a battery infiltration device according to an embodiment of the present application is shown in Figure 9. As shown in Figure 9, the device includes: a determination module 91 for determining a target voltage based on a battery system parameter of the battery, the target voltage affecting the infiltration characteristics of the electrolyte into the battery pole pieces, the target voltage being determined from a voltage application range corresponding to the battery system parameter, the voltage application range being determined based on the battery system parameter of the battery; and a processing module 92 for generating a voltage application command corresponding to the target voltage after the electrolyte is injected into the battery and before the electrolyte reacts with the battery pole pieces, the voltage application command being for applying the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces.

[0052] In some embodiments, the battery includes a first electrode and a second electrode, and generating a voltage application command corresponding to the target voltage comprises: generating a voltage application command to apply the target voltage to the first electrode and the second electrode; When a target voltage is applied to the first electrode, a first charge is generated, and when a target voltage is applied to the second electrode, a second charge is generated, and the first electrode, which has been charged with the first charge, attracts first charged ions to move to the first electrode, and the second electrode, which has been charged with the second charge, attracts second charged ions to move to the second electrode.

[0053] 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 charged ion is a cation, and the second charged ion is an anion.

[0054] In some embodiments, the expression of the wetting property includes a contact angle, and the smaller the contact angle, the better the electrolyte will wet the battery pole pieces or separator.

[0055] In some embodiments, the determining module 91 is for determining a target voltage based on battery system parameters of the battery, and this step includes: determining a voltage application range for the battery system parameter based on a relationship between a battery voltage corresponding to the battery system parameter and a degree of infiltration of the battery; and selecting a target voltage based on the voltage application range; Alternatively, it includes determining a voltage application range corresponding to a battery system parameter of the battery from a predetermined set of voltage application ranges, selecting a target voltage from the determined voltage application range, recording a plurality of voltage application ranges corresponding to the battery system parameters in the set of voltage application ranges, and determining the voltage application range for one battery system parameter based on the relationship between the battery voltage corresponding to the battery system parameter and the degree of infiltration of the battery.

[0056] As an option, the voltage application range corresponding to the battery system parameters of the battery is 0V to 2V or -2V to 0V, and the absolute value of the target voltage is 0.1V.

[0057] Optionally, the target voltage application method is a constant voltage application or a pulse type voltage application.

[0058] In some embodiments, the battery system parameters include the temperature of the environment in which the battery is filled, the operating pressure, the battery structure, the pole piece parameters, the electrolyte parameters, the separator, and the interaction parameters between the pole piece or the separator and the electrolyte.

[0059] As an alternative implementation, the battery system parameters are first battery system parameters, the battery structure in the first battery system parameters is a wound battery, and the positive electrode piece in the electrode piece parameters is a ternary material NMC622 material; In the first battery system parameter, when a target voltage is not applied to the battery, the time consumed for the electrolyte in the battery to infiltrate the battery pole pieces is a first consumption time, and when a target voltage is applied to the battery, the time consumed for the electrolyte in the battery to infiltrate the battery pole pieces is a second consumption time, and the second consumption time is shorter than the first consumption time.

[0060] In another alternative embodiment, the battery system parameters are second battery system parameters, the battery structure in the second battery system parameters is a stacked battery, and the positive electrode piece in the electrode piece parameters is a lithium iron phosphate LFP material; In the second battery system parameters, when a target voltage is not applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a third consumption time, and when a target voltage is applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a fourth consumption time; the fourth consumption time is shorter than the third consumption time, the fourth consumption time is shorter than the second consumption time, the second consumption time is a consumption time for the electrolyte in the battery to infiltrate the battery pole pieces when a target voltage is applied to the battery corresponding to the first battery system parameters in first battery system parameters, the battery structure in the first battery system parameters is a wound-type battery, the positive pole piece in the pole piece parameters is made of NMC622 material, and the first battery system parameters are the same as other parameters other than the battery structure and pole piece parameters in the second battery system parameters.

[0061] An embodiment of the present application further provides a battery immersion system, and FIG. 10 exemplarily shows an optional structural schematic diagram of a battery immersion system according to an embodiment of the present application. As shown in FIG. 10, the battery immersion system may include at least a data processing device 101 and a voltage application device 102.

[0062] The data processing device 101 is used for determining a target voltage based on a battery system parameter of a battery, the target voltage affects the infiltration characteristics of the electrolyte into the battery pole pieces, the target voltage is determined from a voltage application range corresponding to the battery system parameter, and the voltage application range is determined based on the battery system parameter of the battery; and generating a voltage application command corresponding to the target voltage after injecting the electrolyte into the battery and before the battery pole pieces of the battery react with the electrolyte; The voltage application device 102 is used to apply the target voltage to the battery under the control of the voltage application command to improve the wetting properties of the electrolyte to the battery pole pieces.

[0063] An embodiment of the present application further provides a storage medium having one or more computer-executable instructions stored thereon, the one or more computer-executable instructions for performing the above-described battery infiltration method.

[0064] The above describes several embodiments according to the examples of the present application. However, unless there is a conflict, the optional features described in each embodiment may be combined with or cross-referenced with each other, resulting in many possible embodiments, all of which may be considered to be embodiments disclosed in the examples of the present application.

[0065] Although the above discloses the embodiments of the present application, the present application is not limited thereto, and those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application should be limited to the scope defined in the claims.

Claims

1. 1. A battery infiltration method comprising: A target voltage is determined based on a battery system parameter of the battery, the target voltage affects the infiltration characteristics of the electrolyte into the battery pole pieces, the target voltage is determined from a voltage application range corresponding to the battery system parameter, and the voltage application range is determined based on the battery system parameter of the battery; A battery infiltration method comprising: generating a voltage application command corresponding to the target voltage after injecting an electrolyte into the battery and before the electrolyte reacts with the battery pole pieces, the voltage application command being for applying the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces.

2. The battery includes a first electrode and a second electrode, and generating a voltage application command corresponding to the target voltage includes: generating a voltage application command to apply the target voltage to the first electrode and the second electrode; 2. The method of claim 1, wherein when a target voltage is applied to the first electrode, a first charge is applied to the first electrode, and when a target voltage is applied to the second electrode, a second charge is applied to the second electrode, and the first electrode, charged with the first charge, attracts first charged ions to migrate to the first electrode, and the second electrode, charged with the second charge, attracts second charged ions to migrate to the second electrode.

3. 3. The battery infiltration method of claim 2, wherein 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 charged ions are cations, and the second charged ions are anions.

4. the expression of the wetting property includes a contact angle; 2. The method of claim 1, wherein the smaller the contact angle, the better the electrolyte will wet the pole pieces or separator of the battery.

5. Determining a target voltage based on a battery system parameter of the battery determining a voltage application range for the battery system parameter based on a relationship between a battery voltage corresponding to the battery system parameter and a degree of infiltration of the battery; and selecting a target voltage based on the voltage application range; Alternatively, the battery infiltration method according to claim 1 further comprises determining a voltage application range corresponding to a battery system parameter of the battery from a predetermined set of voltage application ranges, selecting a target voltage from the determined voltage application range, recording a plurality of voltage application ranges corresponding to the battery system parameters in the voltage application range set, and determining a voltage application range for one battery system parameter based on the relationship between the battery voltage corresponding to the battery system parameter and the degree of infiltration of the battery.

6. 6. The battery impregnation method according to claim 5, wherein the voltage application range corresponding to the battery system parameters of the battery is 0V to 2V or -2V to 0V, and the absolute value of the target voltage is 0.1V.

7. 7. The method for infiltrating a battery according to claim 6, wherein the target voltage is applied in a constant voltage or pulse type voltage manner.

8. 2. The method for infiltrating a battery according to claim 1, wherein the battery system parameters include the environmental temperature of the battery when injecting the electrolyte, the working pressure, the battery structure, the electrode piece parameters, the electrolyte parameters, the separator, and the interaction parameters between the electrode piece or the separator and the electrolyte.

9. The battery system parameters are first battery system parameters, the battery structure in the first battery system parameters is a wound-type battery, and the positive electrode piece in the electrode piece parameters is a ternary material NMC622 material; The battery infiltration method described in claim 8, characterized in that, in the first battery system parameters, when a target voltage is not applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a first consumption time, and when a target voltage is applied to the battery, the consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a second consumption time, and the second consumption time is shorter than the first consumption time.

10. The battery system parameters are second battery system parameters, the battery structure in the second battery system parameters is a stacked battery, and the positive electrode piece in the electrode piece parameters is a lithium iron phosphate (LFP) material; In the second battery system parameters, when a target voltage is not applied to the battery, a consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a third consumption time, and when a target voltage is applied to the battery, a consumption time for infiltrating the battery pole pieces with the electrolyte in the battery is a fourth consumption time; 9. The battery infiltration method according to claim 8, wherein the fourth consumption time is shorter than the third consumption time, the fourth consumption time is shorter than the second consumption time, the second consumption time is a consumption time for infiltrating the battery pole pieces with the electrolyte in the battery when a target voltage is applied to the battery corresponding to the first battery system parameter in a first battery system parameter, the battery structure in the first battery system parameter is a wound-type battery, the positive pole piece in the pole piece parameter is made of NMC622 material, and the first battery system parameter is the same as other parameters other than the battery structure and pole piece parameters in the second battery system parameter.

11. 1. A battery infiltration device comprising: a determination module for determining a target voltage based on a battery system parameter of the battery, the target voltage affecting the infiltration characteristics of the electrolyte into the battery pole pieces, the target voltage being determined from a voltage application range corresponding to the battery system parameter, the voltage application range being determined based on the battery system parameter of the battery; A battery infiltration device characterized by comprising: a processing module for generating a voltage application command corresponding to the target voltage after injecting an electrolyte into the battery and before the electrolyte reacts with the battery pole pieces, the voltage application command being for applying the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces.

12. 1. A battery infiltration system comprising: At least a data processing device and a voltage application device are provided, The data processing device is used for determining a target voltage based on a battery system parameter of a battery, the target voltage affects the infiltration characteristics of an electrolyte into a battery pole piece, the target voltage is determined from a voltage application range corresponding to the battery system parameter, and the voltage application range is determined based on the battery system parameter of the battery; and generating a voltage application command corresponding to the target voltage after injecting an electrolyte into the battery and before the battery pole piece of the battery reacts with the electrolyte; A battery infiltration system, characterized in that the voltage application device is used to apply the target voltage to the battery to improve the infiltration characteristics of the electrolyte into the battery pole pieces under the control of the voltage application command.

13. A storage medium, 11. A storage medium having stored thereon one or more computer-executable instructions for carrying out the battery infiltration method of any one of claims 1 to 10.

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