Lithium-ion battery processing device, method for processing lithium-ion battery and application thereof

Abstract

This application relates to the field of battery technology, and discloses a lithium-ion battery processing apparatus and a method for processing lithium-ion batteries, a lithium-ion battery, a battery device, and an electrical device. The lithium-ion battery processing apparatus includes: an electromagnetic coil internally defining a receiving space for accommodating the lithium-ion battery; an electronic oscillator including an electronic oscillator input port and an electronic oscillator output port, the electronic oscillator output port being connected to the electromagnetic coil; and a current input device for outputting current, the current input device being connected to the electronic oscillator input port. This lithium-ion battery processing apparatus has a wide range of applications, a simple structure, and the lithium-ion batteries processed using this apparatus exhibit excellent electrochemical performance.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a lithium-ion battery processing device and its method and application for processing lithium-ion batteries, and more specifically to a lithium-ion battery processing device and its method for processing lithium-ion batteries, lithium-ion batteries, battery devices, and electrical devices. Background Technology

[0002] As one of the most important physical fields in nature, the electromagnetic field is increasingly widely used in materials processing due to its unique properties. Specifically, as a non-contact energy transfer method, the proper use of magnetic fields can positively impact the performance of lithium-ion batteries. In recent years, the effect of external magnetic fields on lithium-ion batteries has received increasing attention, with most related technologies focusing on the impact of uniform magnetic fields on capacity. However, research on the application methods of magnetic fields and their effects on other battery performance aspects remains to be explored. Therefore, this application will further investigate the influence of magnetic fields on more aspects of battery performance. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a lithium-ion battery processing device and a method for processing lithium-ion batteries, as well as a lithium-ion battery, a battery device, and an electrical device. This lithium-ion battery processing device has a wide range of applications, a simple structure, and the lithium-ion batteries processed using this device exhibit excellent electrochemical performance.

[0004] A first aspect of this application provides a lithium-ion battery processing device, comprising:

[0005] An electromagnetic coil, with an internally defined space for housing a lithium-ion battery; An electronic oscillator includes an electronic oscillator input port and an electronic oscillator output port, wherein the electronic oscillator output port is connected to the electromagnetic coil; A current input device is used to output current, and the current input device is connected to the input port of the electronic oscillator.

[0006] The lithium-ion battery processing device of this application innovatively introduces an electronic oscillator. The core function of the electronic oscillator is to convert a stable current into an alternating signal with an adjustable frequency. This alternating signal can drive an electromagnetic coil to generate an electromagnetic field of a corresponding frequency. Specifically, the alternating signal output to the electromagnetic coil can cause the electromagnetic coil to generate a periodically changing electromagnetic field. Therefore, using this lithium-ion battery processing device, the influence of electromagnetic fields on the performance of lithium-ion batteries can be studied in depth.

[0007] In addition, the lithium-ion battery processing apparatus according to the above embodiments of this application may also have the following additional technical features: In some embodiments, the electronic oscillator includes an RC electronic oscillator and an LC electronic oscillator connected in parallel.

[0008] In some embodiments, the lithium-ion battery processing device satisfies at least one of the following: The current input device includes a current adjustment component for adjusting the magnitude of the current; The electronic oscillator includes an electronic oscillator adjustment component for adjusting the frequency of the electronic oscillator.

[0009] In some embodiments, the lithium-ion battery processing apparatus further includes: A temperature sensor is installed in the containment space to detect the temperature within the containment space.

[0010] A second aspect of this application provides a method for processing lithium-ion batteries using the aforementioned lithium-ion battery processing device, comprising: The lithium-ion battery is placed in the containment space such that the ion transport direction between the positive and negative electrodes of the lithium-ion battery is perpendicular to the central axis of the electromagnetic coil. A non-uniform magnetic field is applied to the lithium-ion battery using the lithium-ion battery processing device.

[0011] The lithium battery processing method of this application integrates the multiple effects of magnetic fields on lithium-ion batteries, is applicable to a variety of battery systems, can improve the initial capacity and cycle performance of most lithium-ion battery systems, has the characteristics of wide applicability, and is simple and easy to operate.

[0012] In some embodiments, applying a non-uniform magnetic field to the lithium-ion battery using the lithium-ion battery processing device includes: The temperature within the containment space, the magnetic field strength of the electromagnetic coil, and the oscillation frequency of the electronic oscillator are sequentially adjusted to keep these parameters within a specific range.

[0013] In some embodiments, the lithium battery processing method satisfies at least one of the following conditions: The temperature inside the containment space is 25℃~60℃; The magnetic field strength is 0.01T~0.5T; The oscillation frequency of the electronic oscillator is 0Hz~25kHz.

[0014] A third aspect of this application provides a lithium-ion battery obtained by the aforementioned method for processing lithium-ion batteries. Consequently, this lithium-ion battery exhibits excellent electrochemical performance.

[0015] In some embodiments, the lithium-ion battery includes a positive electrode active material, which includes a layered oxide positive electrode material, preferably including at least one of a ternary positive electrode material and a lithium-rich manganese-based oxide positive electrode material.

[0016] A fourth aspect of this application provides a battery device comprising the aforementioned lithium-ion battery processing device and a lithium-ion battery. The lithium-ion battery is disposed within the housing space of the lithium-ion battery processing device, and the ion transport direction between the positive and negative electrodes of the lithium-ion battery is parallel to the central axis of the electromagnetic coil of the lithium-ion battery processing device. Therefore, this battery device exhibits excellent electrochemical performance.

[0017] A fifth aspect of this application provides an electrical device comprising the aforementioned lithium-ion battery or the aforementioned battery device. Therefore, the electrical device exhibits excellent electrochemical performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an electronic oscillator driving an electromagnetic coil to generate a periodically changing electromagnetic field according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the casing of a lithium-ion battery processing device according to an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of a lithium-ion battery being placed in an electromagnetic coil during processing, according to one embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the diffusion path of lithium ions when a periodically changing electromagnetic field is applied to a lithium-ion battery in one embodiment of this application.

[0022] Figure 5 This is a schematic diagram showing the generation of eddy currents in the conductors of a lithium-ion battery when a periodically changing electromagnetic field is applied to the battery in one embodiment of this application. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The actual capacity of a lithium-ion battery differs from the theoretical capacity of its active materials. The capacity of the active materials is closely related to the initial formation process of the lithium-ion battery. Some technologies apply a uniform magnetic field to the battery during formation to increase the migration channels for lithium ions, making it easier for them to migrate between the positive and negative electrodes. This also activates some inactive lithium ions, increasing the number of lithium ions migrating between the electrodes and thus improving the actual capacity of the battery. Other technologies apply a uniform magnetic field to the battery during the charging phase of high-capacity batteries. Under the influence of the magnetic field, lithium ions are evenly distributed on the current collector of the negative electrode, effectively suppressing lithium dendrite formation and further improving the capacity of high-capacity batteries. The above studies all focus on the effect of uniform magnetic fields on battery capacity. Therefore, the inventors considered developing a simple magnetic field device with a real-time adjustable magnetic field. This device would allow for further research into the effects of different types of magnetic fields on various battery performance characteristics.

[0025] In a first aspect of this application, a lithium-ion battery processing device is proposed, comprising an electromagnetic coil, an electronic oscillator, and a current input device, wherein the interior of the electromagnetic coil defines a receiving space for accommodating a lithium-ion battery; the electronic oscillator includes an electronic oscillator input port and an electronic oscillator output port, the electronic oscillator output port being connected to the electromagnetic coil; and the current input device is used to output current and is connected to the electronic oscillator input port.

[0026] The lithium-ion battery processing device of this application innovatively introduces an electronic oscillator. The core function of the electronic oscillator is to convert a stable current into an alternating signal with an adjustable frequency. This alternating signal can drive an electromagnetic coil to generate an electromagnetic field of a corresponding frequency. Specifically, the alternating signal output to the electromagnetic coil can cause the electromagnetic coil to generate a periodically changing electromagnetic field. Therefore, using this lithium-ion battery processing device, the impact of periodically changing electromagnetic fields on the performance of lithium-ion batteries can be studied in depth.

[0027] Specifically, a schematic diagram of a periodically changing electromagnetic field generated by driving an electromagnetic coil with an electronic oscillator is shown below. Figure 1 The vertical axis represents the magnitude of the current, the horizontal axis represents time, and B represents the corresponding magnetic field and direction generated.

[0028] In some embodiments, the electronic oscillator includes an RC electronic oscillator (i.e., a resistor-capacitor oscillator) and an LC electronic oscillator (i.e., an inductor-capacitor oscillator) connected in parallel. The RC electronic oscillator is responsible for outputting low-frequency signals, and the LC electronic oscillator is responsible for outputting high-frequency signals. In the lithium-ion processing device of this application, the RC and LC electronic oscillators are connected in parallel and connected to a current input device, enabling the output of signals across the entire frequency range from low to high. This helps to adapt to the different frequency electrical signal requirements of various processes in lithium-ion batteries.

[0029] In some embodiments, the current input device includes a current regulating component that can be used to adjust the magnitude of the current. Different battery models or batteries with different aging levels have different current tolerances (or requirements). Adjusting the current here can ensure that the battery is not damaged, while different current magnitudes help make the device compatible with more process requirements.

[0030] In some embodiments, the electronic oscillator includes an electronic oscillator adjustment component for adjusting the frequency of the electronic oscillator. When different battery performance characteristics are enhanced by electromagnetic fields (such as increasing battery capacity, promoting electrode interface reactions, etc.), the battery has different response efficiencies to electromagnetic fields of different frequencies. For example, lower frequencies more readily promote lithium-ion diffusion, while higher frequencies help activate the active materials at the interface. Therefore, incorporating an electronic oscillator adjustment component helps to precisely match the electromagnetic field to the microscopic processes during battery charging and discharging, further improving the processing effect.

[0031] In some embodiments, the lithium-ion battery processing apparatus further includes a temperature sensor disposed in the containment space for detecting the temperature within the containment space. Lithium batteries are highly sensitive to temperature, and processing them using this apparatus may cause the lithium batteries to heat up. The temperature sensor allows for real-time monitoring of the temperature within the containment space. If the detected temperature exceeds a safety threshold, the current can be adjusted to control the temperature, thereby ensuring the safe and smooth operation of the lithium battery processing process.

[0032] In some embodiments, the lithium-ion battery processing device may be provided with a housing; for example, a schematic diagram of the housing can be referred to. Figure 2 The outer casing 1 is made of magnetic shielding material, which can be aluminum, copper, zinc, iron, nickel, or other metals and their alloys. Furthermore, the outer casing 1 can be equipped with a current input port 2, a current adjustment button 3, an electronic oscillator adjustment button 4, and a temperature display screen 5, allowing real-time adjustment of the current, frequency, and temperature via the buttons.

[0033] A second aspect of this application provides a method for processing lithium-ion batteries using the aforementioned lithium-ion battery processing device, comprising: S10: Place the lithium-ion battery in the housing space, such that the ion transport direction between the positive and negative electrodes of the lithium-ion battery is perpendicular to the central axis of the electromagnetic coil.

[0034] In this step, a schematic diagram showing the lithium-ion battery placed in the electromagnetic coil is provided. Figure 3 In the diagram, i represents the current and its direction, B represents the magnetic field and its direction inside the electromagnetic coil, and the blue dashed line in the electromagnetic coil represents the lithium battery. The diagram also indicates the charging and discharging process of the lithium-ion battery. + The direction of transmission.

[0035] Specifically, the above-mentioned directional settings improve battery performance mainly in the following ways: 1. Layered oxide cathode materials (such as ternary cathode materials, lithium-rich manganese-based oxide cathode materials, etc.) are easily magnetized along the c-axis. The (003) crystal plane of the layered oxide cathode material is perpendicular to the c-axis, and lithium ions in the layered material preferentially diffuse in the (003) crystal plane. Therefore, in the magnetic field of the above-mentioned direction, the diffusion of lithium ions along the (003) crystal plane direction parallel to the magnetic field tends to be accelerated. 2. When a lithium battery is working, lithium ions need to move back and forth at the contact surface between the electrode (such as the cathode) and the electrolyte. When the direction of the magnetic field is consistent with the direction of the lithium ions, it can reduce the transmission resistance of lithium ions at this interface, allowing ions to pass through the interface more smoothly and reducing energy loss. In other words, it is beneficial to the diffusion of lithium ions in the layered cathode material at the interface, making the generated electrode / electrolyte interface film more compact.

[0036] S20: Apply a magnetic field to the lithium-ion battery using the lithium-ion battery processing device.

[0037] In this step, a magnetic field is applied to the lithium-ion battery while the lithium ions are being charged and discharged. Specifically, the strength of the applied magnetic field and the duration can be adjusted according to actual needs.

[0038] In some embodiments, the temperature within the containment space, the magnetic field strength of the electromagnetic coil, and the oscillation frequency of the electronic oscillator are sequentially adjusted to keep these parameters within a specific range. The specific adjustment parameters are not limited here and can be set according to actual needs.

[0039] In some embodiments, a periodically varying electromagnetic field is applied to the lithium-ion battery during charging and discharging. The main improvements to battery performance are: 1. It promotes a more uniform distribution of lithium ions in the electrolyte. Specifically, when the transport direction of lithium ions in the liquid electrolyte is perpendicular to the magnetic field direction, they are significantly affected by the Lorentz force. In a magnetic field with a fixed direction, the Lorentz force on lithium ions causes them to deflect to one side. To further demonstrate the effect of the applied magnetic field, a periodically varying electromagnetic field can be applied to the lithium-ion battery. In this case, lithium ions in the electrolyte will experience alternating Lorentz forces in two directions during transport. The force of the electric field is superimposed throughout the diffusion process. (Refer to...) Figure 4 The diffusion path of lithium ions will exhibit an S-shape, which has a certain stirring effect on the electrolyte, promoting the uniform distribution of lithium ions in the electrolyte and further enhancing the diffusion rate of lithium ions. 2. When a polymer solid electrolyte is used in a lithium-ion battery, an external magnetic field facilitates the polymerization reaction and improves the conversion rate. When a large, periodically varying electromagnetic force is applied to the lithium-ion battery, [refer to...] Figure 5 This will cause eddy currents to form in the conductors of the battery, thereby generating heat, which is beneficial for the uniform curing of the thermopolymer electrolyte and reduces the heating time.

[0040] In some embodiments, when processing lithium-ion batteries, the temperature within the containment space is maintained at 25°C to 60°C. Specifically, this can be 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, or 60°C. Within this temperature range, the electrolyte maintains a suitable viscosity, and the ion activity and migration efficiency are at a good level. Combined with parameters such as magnetic field and current, interface optimization and ion activation can be efficiently achieved.

[0041] In some embodiments, the magnetic field strength applied to the lithium-ion battery is 0.01T to 0.5T, specifically, it can be 0.01T, 0.1T, 0.2T, 0.3T, 0.4T, 0.5T, or any range between two of these values. This magnetic field strength can improve the performance of the lithium-ion battery to a certain extent while ensuring that it does not excessively interfere with the structure of the electrode materials in the battery. The specific magnetic field strength can be adjusted according to the actual battery type and size.

[0042] In some embodiments, when processing lithium-ion batteries, the oscillation frequency of the electronic oscillator is 0Hz to 25kHz, specifically, it can be 0Hz, 5Hz, 10Hz, 15Hz, 20Hz, 25Hz, or any range between two of them. The oscillation frequency can be set according to actual needs.

[0043] Therefore, the lithium battery processing method of this application integrates the multiple effects of magnetic fields on lithium-ion batteries. It can pre-treat the battery during the formation process and continuously apply a non-uniform magnetic field during cycling. It is applicable to a variety of battery systems and can improve the initial capacity and cycle performance of most lithium-ion battery systems. It has the characteristics of wide applicability and is simple and easy to operate. The strength of the magnetic field generated by the coil is adjusted by adjusting the magnitude of the input current, and the rate of change of the magnetic field direction is adjusted by adjusting the frequency of the electronic oscillator.

[0044] In a third aspect of this application, a lithium-ion battery is provided, which is obtained by the aforementioned method for processing lithium-ion batteries. As a result, this lithium-ion battery exhibits excellent electrochemical performance, such as high capacity retention.

[0045] In some embodiments, lithium-ion batteries may include a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode, negative electrode, and separator can be fabricated into a battery cell using a winding or stacking process, and the battery cell and electrolyte can be housed in an outer package. During battery charging and discharging, active ions repeatedly insert and extract between the positive and negative electrodes. The electrolyte acts as a conductor of ions between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits between the positive and negative electrodes while allowing ions to pass through.

[0046] In some embodiments, the battery in this application can be an all-solid-state battery, including a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery, active ions are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, mainly to prevent short circuit between the positive electrode and the negative electrode, while allowing active ions to pass through.

[0047] In some embodiments, the positive electrode sheet includes a positive current collector and a positive electrode material layer disposed on at least one side of the positive current collector. The positive electrode material layer includes a positive electrode active material, which includes a layered oxide positive electrode material, preferably at least one of a ternary positive electrode material and a lithium-rich manganese-based oxide positive electrode material. The positive current collector can be aluminum foil, which has strong electrochemical stability, does not undergo side reactions with the positive electrode material or electrolyte, and can maintain the stability of the positive current collector for a long time.

[0048] In some embodiments, the positive electrode material layer may also include a positive electrode conductive agent and a positive electrode binder, and may also include additives with specific functions and effects, such as lithium supplements, film-forming additives, flame retardants, high-temperature / low-temperature stabilizers, etc., as needed.

[0049] In some embodiments of this application, the positive electrode adhesive may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), a terpolymer of PVDF-tetrafluoroethylene-propylene, a terpolymer of PVDF-hexafluoropropylene-tetrafluoroethylene, a tetrafluoroethylene-hexafluoropropylene copolymer, and a fluorinated acrylate resin. This allows the positive electrode dressing layer to adhere well to the positive electrode current collector, resulting in strong adhesion and reducing the likelihood of problems such as positive electrode dressing detachment.

[0050] In some embodiments of this application, the positive electrode conductive agent may include at least one selected from Super P, superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes (CNTs), graphene, and carbon nanofibers. This effectively improves conductivity, reduces internal resistance, and enhances the electrochemical performance of lithium-ion batteries.

[0051] In some embodiments, the negative electrode sheet includes a negative current collector and a negative electrode material layer disposed on at least one side of the negative current collector. The negative electrode material layer includes a negative electrode active material, such as artificial graphite or porous carbon. These negative electrode active materials possess excellent capacity performance and low cost, and different active materials can be selected according to actual needs.

[0052] The negative electrode current collector can be copper foil. Copper has excellent conductivity, which can efficiently transfer electrons to the negative electrode, reduce the internal resistance of the electrode, and improve the rate performance of the battery. At the same time, copper will not undergo side reactions with the negative electrode material.

[0053] In some embodiments of this application, the negative electrode material layer may further include a negative electrode conductive agent, a negative electrode binder, a thickener, etc. The negative electrode binder may include, but is not limited to, at least one of styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS). The negative electrode conductive agent may include, but is not limited to, at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. The thickener includes sodium carboxymethyl cellulose (CMC), etc.

[0054] In some embodiments, the separator may be a separator known in the art that can be used in lithium-ion batteries and is stable to the electrolyte used, such as a polyethylene separator, a polypropylene separator, a polyethylene / polypropylene composite separator, etc.

[0055] According to embodiments of this application, the electrolyte may include lithium salt and solvent. Furthermore, additives with specific functions, such as film-forming additives, lithium replenishing agents, flame retardants, and thermal stability additives, may be added to the electrolyte as needed. As an example, the electrolyte may include lithium salt, solvent, and additives. In some embodiments of this application, the lithium salt may include LIPF6. Lithium salt can provide lithium ions to the battery, support the stability of the electrolyte and electrochemical reactions, help form a protective SEI film, improve conductivity, and enhance the safety of lithium-ion batteries.

[0056] According to embodiments of this application, the solvent may include carbonates, fluorocarbonates, etc. This allows for the sufficient dissolution of lithium salts, provides an ion transport medium, and also helps improve the electrochemical and safety performance of lithium-rich manganese-based batteries.

[0057] A fourth aspect of this application proposes a battery device comprising the aforementioned lithium-ion battery processing device and a lithium-ion battery. The lithium-ion battery is disposed within the accommodating space of the lithium-ion battery processing device, and the ion transport direction between the positive and negative electrodes of the lithium-ion battery is parallel to the central axis of the electromagnetic coil of the lithium-ion battery processing device. Therefore, this battery device possesses all the advantages of the aforementioned lithium-ion battery processing device and lithium-ion battery, which will not be elaborated further here.

[0058] A fifth aspect of this application provides an electrical device comprising the aforementioned lithium-ion battery or the aforementioned battery device. Therefore, the electrical device exhibits excellent electrochemical performance.

[0059] In some embodiments, the specific type of electrical device is not particularly limited and can be any device that uses a lithium-ion battery or the aforementioned battery device as a power source or energy storage unit. For example, electrical devices include, but are not limited to, electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), mobile terminals (e.g., mobile phones, laptops, game consoles, wearable devices, etc.), drones, aerospace equipment, satellites, ships, energy storage systems, and so on.

[0060] It is understood that, in addition to the lithium-ion battery or battery device mentioned above, the electrical device also includes other necessary structures and components, all of which can be made with reference to conventional technologies. For example, an electric vehicle may include a body, chassis, tires, navigation system, radar system, steering system, braking system, lubrication system, cooling system, driving system, etc., which will not be described in detail here.

[0061] The present application will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the present application in any way. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0062] Example 1 Lithium-ion batteries: Positive electrode sheet: Aluminum foil is used as the positive electrode current collector, and the weight ratio of positive electrode active material NCM523, conductive agent Super P, and binder PVDF in the positive electrode material layer is 97.75:0.75:1.5. The compaction density of the positive electrode sheet is 20 mg / cm³. 2 .

[0063] Negative electrode sheet: Copper foil is used as the negative electrode current collector, and the weight ratio of the negative electrode active material artificial graphite, conductive agent Super P, thickener CMC, and binder SBR in the negative electrode material layer is 94.5:1.5:1.5:2.5. The compaction density of the negative electrode sheet is 6 mg / cm³. 2 .

[0064] Diaphragm: PE diaphragm.

[0065] Electrolyte: A mixture of lithium salt, solvent, and additives. Specifically, the concentration of lithium salt LiPF6 in the electrolyte is 1.3 mol / L; the solvent mass ratio is EC:EMC = 3:7; based on the total mass of the electrolyte, the additives are: vinylene carbonate (VC) 0.5 wt% VC; fluoroethylene carbonate (FEC) 1.0 wt% VC; and 1,3-propanesulfonic acid lactone (1,3-PS) 0.8 wt% VC.

[0066] The above-mentioned positive and negative electrode sheets are stacked to form a core package.

[0067] The above-mentioned lithium-ion batteries are processed using the lithium-ion battery processing apparatus of this application: Specifically, during the treatment, the magnetic field strength was maintained at 0.2T (applied for the first 3 cycles of the battery), the oscillation frequency of the electronic oscillator was 50Hz, and the internal temperature of the device was maintained at 25℃. The capacity retention rate of the lithium-ion battery after 500 cycles was tested to be 88.6%. Specifically, the cycle voltage range during the cycle test was 2.0~4.4V, and the current rate was 1C.

[0068] Example 2 Same as Example 1, except that the oscillation frequency of the electronic oscillator is 100Hz. The capacity retention rate of the lithium-ion battery after 500 cycles was tested to be 90.2%.

[0069] Example 3 Similar to Example 1, the specific difference is that the oscillation frequency of the electronic oscillator is 100Hz and a magnetic field is continuously applied. The capacity retention rate of the lithium-ion battery after 500 cycles is tested to be 93.8%.

[0070] Example 4 Lithium-ion battery: Same as Example 1, the main difference being that the electrolyte includes polyethylene glycol diacrylate, cyclic carbonate, 1,3-dioxolane, azobisisobutyronitrile, and lithium salt LiPF6. The concentration of LiPF6 in the electrolyte is 1.0 mol / L, and the mass ratio of polyethylene glycol diacrylate, cyclic carbonate, 1,3-dioxolane, and azobisisobutyronitrile is 3:93.5:3:0.5. The above electrolyte is injected into the battery cell, encapsulated, and then thermosetting. During the thermosetting process, a magnetic field is applied to accelerate the curing time and improve uniformity.

[0071] Specifically, the lithium-ion battery processing device of this application is used for heat curing: Specifically, during the process, the magnetic field strength was maintained at 0.1T, the oscillation frequency of the electronic oscillator was 10kHz, and the internal temperature of the device was maintained at 60℃. The curing time of the lithium-ion battery polymer solid electrolyte was measured to be 12 hours. Specifically, thermocouples were used to monitor the temperature change of the battery, and the cured battery was disassembled at regular intervals to observe the uniformity of curing inside the battery, recording the time to complete curing.

[0072] Example 5 Similar to Example 4, the specific differences are: the magnetic field strength is 0.2T, and the oscillation frequency of the electronic oscillator is 15kHz. The curing time of the lithium-ion battery polymer solid electrolyte was measured to be 10h.

[0073] Example 6 Similar to Example 4, the specific differences are: the magnetic field strength is 0.5T, and the oscillation frequency of the electronic oscillator is 25kHz. The curing time of the lithium-ion battery polymer solid electrolyte was measured to be 5 hours.

[0074] Comparative Example 1 Same as Example 1, except that: no battery is treated, that is, the magnetic field strength and oscillation frequency are both 0, and the capacity retention rate of the lithium-ion battery after 500 cycles is 86.3%.

[0075] Comparative Example 2 Same as Example 4, except that: no battery treatment is performed, i.e., the magnetic field strength and oscillation frequency are both 0, and the curing time of the lithium-ion battery polymer solid electrolyte is measured to be 18h.

[0076] Conclusion: The results of Examples 1-4 and Comparative Example 1 show that the batteries treated with magnetic fields exhibit more stable capacity retention during charge-discharge cycles; at the same time, compared with the untreated batteries, the initial capacity of the batteries treated with magnetic fields can be increased from 1790mAh (Comparative Example 1) to about 1850mAh (Examples 1-3).

[0077] The results from Examples 5-6 and Comparative Example 2 show that under the action of magnetic field treatment, the uniform curing time of the polymer electrolyte can be shortened from 18 hours in the traditional method to 5 hours. Moreover, the temperature distribution of the polymer electrolyte after magnetic field treatment is more uniform during the curing process, and the curing uniformity of the electrolyte inside the battery is improved.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0079] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lithium-ion battery processing apparatus, characterized by, include: An electromagnetic coil, with an internally defined space for housing a lithium-ion battery; An electronic oscillator includes an electronic oscillator input port and an electronic oscillator output port, wherein the electronic oscillator output port is connected to the electromagnetic coil; A current input device is used to output current, and the current input device is connected to the input port of the electronic oscillator.

2. The lithium-ion battery processing apparatus of claim 1, wherein, The electronic oscillator includes an RC electronic oscillator and an LC electronic oscillator connected in parallel.

3. The lithium-ion battery processing apparatus of claim 1, wherein, Meet at least one of the following: The current input device includes a current adjustment component for adjusting the magnitude of the current; The electronic oscillator includes an electronic oscillator adjustment component for adjusting the frequency of the electronic oscillator.

4. The lithium-ion battery processing apparatus of claim 1, wherein, Also includes: A temperature sensor is installed in the containment space to detect the temperature within the containment space.

5. A method of processing lithium ion batteries using the lithium ion battery processing apparatus according to any one of claims 1 to 4, characterized by, include: The lithium-ion battery is placed in the containment space such that the ion transport direction between the positive and negative electrodes of the lithium-ion battery is perpendicular to the central axis of the electromagnetic coil. A non-uniform magnetic field is applied to the lithium-ion battery using the lithium-ion battery processing device.

6. The method of claim 5, wherein, The step of applying a magnetic field to the lithium-ion battery using the lithium-ion battery processing device includes: The temperature within the containment space, the magnetic field strength of the electromagnetic coil, and the oscillation frequency of the electronic oscillator are sequentially adjusted to keep these parameters within a specific range.

7. The method of claim 6, wherein, At least one of the following conditions must be met: The temperature inside the containment space is 25℃~60℃; The magnetic field strength is 0.01T~0.5T; The oscillation frequency of the electronic oscillator is 0Hz~25kHz.

8. A lithium-ion battery, characterized by It is obtained by the method of processing lithium-ion batteries as described in any one of claims 5 to 7.

9. The lithium-ion battery of claim 8, wherein, It includes a positive electrode active material, which includes a layered oxide positive electrode material, preferably including at least one of a ternary positive electrode material and a lithium-rich manganese-based oxide positive electrode material.

10. A battery device comprising the lithium-ion battery processing device and the lithium-ion battery as described in claims 1 to 4, wherein the lithium-ion battery is disposed in the accommodating space of the lithium-ion battery processing device, and the ion transport direction between the positive and negative electrodes of the lithium-ion battery is parallel to the central axis of the electromagnetic coil of the lithium-ion battery processing device.

11. An electrical appliance, characterized in that, Includes the lithium-ion battery as described in any one of claims 8 to 9 or the battery device as described in claim 10.