Pole piece surface magnetic particle cleaning device and pole piece surface magnetic particle cleaning system
By employing a coupling mode of vibration followed by magnetic attraction on the surface of lithium-ion battery electrodes, combined with ultrasonic waves and multi-frequency vibrations, the problem of removing tiny magnetic particles has been solved, improving cleaning efficiency and battery safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2026-05-15
- Publication Date
- 2026-08-04
AI Technical Summary
Existing technologies are insufficient to effectively remove tiny magnetic particles from the surface of lithium-ion battery electrodes, leading to the risk of short circuits and spontaneous combustion in the cells. Traditional methods have low demagnetization efficiency for particles smaller than 25µm.
It adopts a coupled working mode of vibration followed by magnetic attraction. The vibration generator loosens the magnetic particles, which are then attracted by the magnetic adsorption device. Combined with ultrasonic and multi-band ultrasonic vibration, the cleaning effect is enhanced.
It significantly improves cleaning efficiency and cleanliness, avoids physical damage to the electrode surface, and ensures battery quality.
Smart Images
Figure CN224586543U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery module manufacturing technology, and in particular to a magnetic particle cleaning device and system for the surface of battery electrodes during the production process. Background Technology
[0002] During the production of lithium-ion battery electrodes, the coating of the battery electrodes may be contaminated by metallic magnetic particles during drying, rolling, slitting, and stamping. If these magnetic particles are eventually incorporated into the battery cells, they may cause risks such as short circuits and spontaneous combustion. Summary of the Invention
[0003] The purpose of this invention is to provide a magnetic particle cleaning device and system for electrode surfaces that can effectively remove magnetic particles from the electrode surface.
[0004] The first aspect of this utility model discloses a magnetic particle cleaning device for electrode surface, used to remove magnetic particles from the electrode surface, comprising:
[0005] A vibration generating device used to vibrate the magnetic particles on the surface of the electrode sheet;
[0006] A magnetic adsorption device is arranged sequentially with the vibration generating device along a first direction, and is used to magnetically adsorb the magnetic particles generated by the vibration generating device after vibration.
[0007] The magnetic particle cleaning device for electrode surfaces in this embodiment employs a vibration generator and a magnetic adsorption device arranged sequentially along a first direction. First, the vibration generator loosens or removes the firmly attached magnetic particles from the electrode surface, freeing them from surface adhesion forces such as electrostatics and van der Waals forces. Then, the magnetic adsorption device, arranged in the same direction, magnetically adsorbs these loosened or detached particles. This coupled working mode of "vibration separation followed by magnetic capture" avoids the drawback of relying solely on magnetic attraction to overcome the initial adhesion of magnetic particles, significantly improving overall cleaning efficiency and final cleanliness. Simultaneously, the entire cleaning process is non-contact, effectively preventing physical damage such as scratches and powdering to the fragile electrode surface coating or foil caused by mechanical scraping, thus ensuring the quality of the electrode.
[0008] In some embodiments, the vibration generating device includes an ultrasonic generating device for emitting ultrasonic waves onto the surface of the electrode.
[0009] In this embodiment, during demagnetization, the ultrasonic generator emits ultrasonic waves onto the electrode surface. Compared to indirectly transmitting the vibrations to the magnetic particles through mechanical vibration or other methods, the ultrasonic waves directly act on the magnetic particles, resulting in better vibration and less impact on the electrode. Simultaneously, after the ultrasonic waves are emitted onto the electrode surface, the interference between the incident and reflected waves forms a standing wave sound field, suspending the magnetic particles and facilitating subsequent magnetic adsorption.
[0010] In some embodiments, the ultrasonic generating device includes a plurality of ultrasonic generating components arranged sequentially along a first direction.
[0011] This embodiment, by arranging multiple ultrasonic generating components sequentially along the first direction, enables multiple ultrasonic emission onto the electrode surface, extending the duration and number of ultrasonic waves acting on the magnetic particles. This makes it easier to "loosen" or "lift" the firmly attached micro-magnetic particles from the electrode surface, thereby improving the capture efficiency of the subsequent magnetic adsorption device.
[0012] In some embodiments, a plurality of ultrasonic generating components arranged sequentially along a first direction are configured to emit ultrasonic waves of different frequencies.
[0013] This embodiment utilizes multi-band ultrasonic waves to selectively resonate and desorb magnetic particles of varying sizes on the electrode surface, ensuring that particles of all sizes receive effective vibrational energy. Compared to single-frequency ultrasonic waves, the multi-band configuration significantly improves the cleaning ability for magnetic particles across the entire size range, particularly effective for tiny particles that are difficult to remove using traditional methods.
[0014] In some embodiments, the ultrasonic generating assembly includes a plurality of ultrasonic transmitters arranged sequentially along a second direction perpendicular to the first direction.
[0015] This embodiment achieves full coverage of the entire width of the electrode sheet by arranging multiple ultrasonic transmitters in the second direction. This ensures that the electrode sheet surface is effectively subjected to ultrasonic waves in the width direction, resulting in thorough cleaning of the electrode sheet. Multiple transmitters can be controlled independently, facilitating adjustment of the effective emission area according to the electrode sheet width and adapting to the production needs of electrode sheets of different specifications.
[0016] In some embodiments, the magnetic adsorption device includes a magnetic adsorption surface for generating magnetic force on the magnetic particles. The magnetic adsorption device includes a plurality of magnets and a plurality of magnetic conductive elements arranged along a first direction. Adjacent magnets are connected by a magnetic conductive element in a parallel manner. Along the first direction, the magnetic field strength of a plurality of magnetically conductive regions on the magnetic adsorption surface corresponding to the plurality of magnetic conductive elements increases sequentially.
[0017] In this embodiment, the magnetic field strength of multiple magnetically conductive regions corresponding to multiple magnetically conductive elements on the magnetically attracted surface increases sequentially along the first direction. Thus, during demagnetization, when the magnetic particle cleaning device moves relative to the electrode surface along the first direction, magnetically attracted particles on the electrode that are easily attracted, such as larger-diameter magnetic particles, are attracted first. Magnetic particles that are difficult to attract will encounter magnetically conductive regions with greater magnetic field strength during relative movement and be attracted. Through graded adsorption, demagnetization can be carried out more efficiently and thoroughly.
[0018] In some embodiments, the thickness of the plurality of magnetic conductive elements decreases sequentially along the first direction.
[0019] This embodiment achieves variations in magnetic field strength without the need for magnets of different properties by varying the thickness of the magnetic conductor.
[0020] In some embodiments, the plurality of magnets are the same permanent magnets.
[0021] In this embodiment, the magnets on both sides of the magnetic conductor are of the same type, and the magnetic lines of force entering the magnetic conductor on both sides are symmetrical. As a result, the magnetic lines of force output from the magnetic surface through the magnetic conductor are more perpendicular to the magnetic surface, which further increases the magnitude of the magnetic attraction force on the magnetic particles and improves the magnetic attraction effect.
[0022] The second aspect of this utility model discloses a magnetic particle cleaning system for an electrode surface, comprising any of the aforementioned magnetic particle cleaning devices and an electrode, wherein the vibration generating device is used to vibrate the magnetic particles on the surface of the electrode, and the magnetic adsorption device is used to magnetically adsorb the magnetic particles vibrated by the vibration generating device.
[0023] The magnetic particle cleaning device for electrode surfaces in this embodiment employs a vibration generator and a magnetic adsorption device arranged sequentially along a first direction. First, the vibration generator loosens or removes the firmly attached magnetic particles from the electrode surface, freeing them from surface adhesion forces such as electrostatics and van der Waals forces. Then, the magnetic adsorption device, arranged in the same direction, magnetically adsorbs these loosened or detached particles. This coupled working mode of "vibration separation followed by magnetic capture" avoids the drawback of relying solely on magnetic attraction to overcome the initial adhesion of magnetic particles, significantly improving overall cleaning efficiency and final cleanliness. Simultaneously, the entire cleaning process is non-contact, effectively preventing physical damage such as scratches and powdering to the fragile electrode surface coating or foil caused by mechanical scraping, thus ensuring the quality of the electrode.
[0024] In some embodiments, when the magnetic adsorption device magnetically adsorbs magnetic particles, the electrode plate moves relative to the magnetic particle cleaning device on the electrode plate surface along a first direction, and the vibration generating device is located upstream of the magnetic adsorption device along the first direction.
[0025] In this embodiment, during demagnetization, the electrode moves relative to the substrate along a first direction, first passing an upstream vibration generator. This generator emits ultrasonic waves or applies other forms of vibration to the electrode surface, causing the magnetic particles attached to the electrode surface to gain initial velocity to detach from the substrate or to be "lifted" into a loose, suspended state. Subsequently, the electrode continues to move along the first direction to a downstream magnetic adsorption device, where the loose or suspended magnetic particles are adsorbed onto the magnetic surface, achieving separation of the magnetic particles from the electrode. By placing the vibration generator upstream of the magnetic adsorption device, the coordinated operation of "vibration-induced desorption followed by magnetic capture" is ensured, thereby achieving a highly efficient demagnetization effect.
[0026] In some embodiments, the device includes two magnetic particle cleaning devices for the electrode surface located on both sides of the electrode in the thickness direction. The vibration generating device includes an ultrasonic generating device. The magnetic adsorption device includes a magnetic adsorption surface for generating magnetic force on the magnetic particles. The magnetic adsorption surface and ultrasonic generating device of one magnetic adsorption device face the surface of one side of the electrode and emit ultrasonic waves to that surface. The magnetic adsorption surface and ultrasonic generating device of the other magnetic adsorption device face the surface of the other side of the electrode and emit ultrasonic waves to that surface.
[0027] This embodiment achieves one-time cleaning of both surfaces of the electrode by arranging a set of magnetic particle cleaning devices on each side of the electrode in the system. This improves cleaning efficiency and avoids the complexity of the process and the risk of electrode damage caused by flipping the electrode after cleaning one side.
[0028] The electrode surface magnetic particle cleaning device provided by this utility model comprises a vibration generating device and a magnetic adsorption device arranged sequentially along a first direction. First, the vibration generating device uses vibration to loosen or detach the firmly attached magnetic particles from the electrode surface, freeing them from surface adhesion forces such as electrostatic forces and van der Waals forces. Then, the magnetic adsorption device, arranged in the same direction, magnetically adsorbs these loosened or detached particles. This collaborative process of "vibration separation followed by magnetic capture" avoids the drawback of relying solely on magnetic attraction to overcome the initial adhesion of particles, significantly improving overall cleaning efficiency and final cleanliness. The entire cleaning process is non-contact, effectively preventing physical damage such as scratches and powdering to the fragile electrode surface coating or foil caused by mechanical scraping, thus ensuring the quality of the electrode.
[0029] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description
[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0031] Figure 1 This is a schematic diagram of the structure of a magnetic particle cleaning system for electrode surfaces, including a magnetic particle cleaning device for electrode surfaces, according to an embodiment of the present invention.
[0032] Figure 2 for Figure 1 A schematic diagram of the ultrasonic generator of the magnetic particle cleaning device for electrode surfaces shown;
[0033] Figure 3 for Figure 2 A schematic diagram of the ultrasonic generator from another angle is shown.
[0034] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the magnetic adsorption device in the electrode surface magnetic particle cleaning device.
[0035] In the figure: 1. Ultrasonic generating device, 11. Ultrasonic generating component, 111. Ultrasonic transmitter; 2. Magnetic adsorption device, 21. Magnet, 22. Magnetic conductor, 220. Magnetic surface, 23. Mounting bracket; 100. Electrode. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0038] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.
[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0041] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.
[0042] In the lithium battery production process, the interaction between materials and equipment during processes such as electrode coating and slitting / die cutting can lead to the generation of magnetic metal particle contaminants, such as Fe, Fe / Cr, Fe / Cr / Ni metal particles and Fe oxides. These contaminants mainly originate from equipment wear (such as coating dies, valves, etc.), raw material contamination, or environmental pollution.
[0043] The harm these magnetic metal particles pose to battery performance is manifested in the fact that micron-sized magnetic particles (such as Fe particles) may puncture the separator, causing an internal short circuit and leading to thermal runaway.
[0044] Traditional electrode surface demagnetization methods primarily employ static adsorption of permanent magnet rods close to the electrode surface. However, this method still results in large magnetic metal particles adsorbed onto the electrode surface (i.e., magnetic metal particle diameter ≥25µm). When the electrode is at a high tape speed (≥100m / min), the demagnetization efficiency for tiny magnetic metal particles smaller than 25µm adhering to the electrode surface is only 20-30%. These magnetic metal particles remain on the electrode surface and, as they are wound into the cell, can still cause self-discharge failure within the cell.
[0045] Due to van der Waals forces, capillary forces, electrostatic adsorption, and oxidation corrosion, tiny magnetic metal particles on the electrode surface are often difficult to remove completely, and their demagnetization efficiency will further decrease at high belt speeds.
[0046] Based on this, this application provides a magnetic particle cleaning device and a magnetic particle cleaning system for electrode surfaces.
[0047] The electrode surface magnetic particle cleaning device disclosed in this application removes magnetic particles from the electrode, which can be applied to battery cells. The corresponding battery cells containing the electrode of this application embodiment can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. The electrode of this application embodiment can be used in lithium-ion batteries, as well as in various battery cells such as sodium-ion battery cells, sodium-lithium-ion battery cells, and magnesium-ion battery cells.
[0048] like Figures 1 to 4 As shown, the magnetic particle cleaning device for electrode surface in this embodiment is used to remove magnetic particles from the electrode surface. The magnetic particle cleaning device for electrode surface includes a vibration generating device and a magnetic adsorption device 2.
[0049] A vibration generator is used to vibrate the magnetic particles on the surface of an electrode. The vibration generator can be, for example... Figure 2 and Figure 3 The ultrasonic generator 1 shown can also be a mechanical vibration device or other device that can generate high-frequency vibrations, which are not shown in the accompanying drawings.
[0050] like Figure 1 As shown, the magnetic adsorption device 2 and the vibration generating device are arranged sequentially along the first direction. The magnetic adsorption device 2 is used to magnetically adsorb the magnetic particles after they have been vibrated by the vibration generating device. That is, during the demagnetization process, the vibration generating device first causes the magnetic particles to vibrate. The magnetic particles after vibration are different from those that were stably attached to the electrode before vibration. The magnetic particles after vibration are either loosely detached from the surface of the electrode 100 or suspended in the air. At this time, the magnetic adsorption device 2 uses magnetic force to adsorb the magnetic particles that are in a different state from those that were stably attached to the electrode before vibration.
[0051] like Figure 1 As shown, the first direction has positive and negative directions, as indicated by the X direction in the figure. The direction from the vibration generating device to the magnetic adsorption device 2 is along the first direction, that is, the positive direction of the first direction. The direction from the magnetic adsorption device 2 to the vibration generating device is the opposite direction of the first direction, that is, the negative direction of the first direction. In the embodiment shown in the figure, when the magnetic particle cleaning device on the electrode surface demagnetizes the electrode 100, the electrode 100 moves relative to the magnetic particle cleaning device on the electrode surface along the first direction. At this time, the vibration generating device along the first direction is located upstream of the magnetic adsorption device 2.
[0052] The magnetic particle cleaning device for electrode surfaces in this embodiment employs a vibration generator and a magnetic adsorption device 2 arranged sequentially along a first direction. First, the vibration generator loosens or removes the firmly attached magnetic particles from the electrode surface, freeing them from surface adhesion forces such as electrostatics and van der Waals forces. Then, the magnetic adsorption device 2, arranged in the same direction, magnetically adsorbs these loosened or detached particles. This coupled working mode of "vibration separation followed by magnetic capture" avoids the drawback of relying solely on magnetic attraction to overcome the initial adhesion of magnetic particles, significantly improving overall cleaning efficiency and final cleanliness. Simultaneously, the entire cleaning process is non-contact, effectively preventing physical damage such as scratches and powdering to the fragile electrode surface coating or foil caused by mechanical scraping, thus ensuring the quality of the electrode.
[0053] In some embodiments, the vibration generating device includes an ultrasonic generator 1, which is used to emit ultrasonic waves toward the surface of the electrode. For example... Figures 1 to 3As shown, the vibration generating device uses an ultrasonic generator 1. During demagnetization, the ultrasonic generator 1 emits ultrasonic waves onto the surface of the electrode. Compared to indirectly transmitting the vibration to the magnetic particles through the vibrating electrode via mechanical vibration, the ultrasonic waves act directly on the magnetic particles, resulting in better vibration and less impact on the electrode. Simultaneously, after the ultrasonic waves are emitted onto the electrode surface, the interference between the incident and reflected waves forms a standing wave sound field, suspending the magnetic particles and facilitating subsequent magnetic adsorption.
[0054] In some embodiments, the ultrasonic generator 1 includes a plurality of ultrasonic generating components 11 arranged sequentially along a first direction. For example... Figure 1 and Figure 2 In the illustrated embodiment, the ultrasonic generator 1 comprises multiple ultrasonic generating components 11 arranged sequentially along a first direction. During demagnetization, as the electrode 100 moves relative to the magnetic particle cleaning device on its surface along the first direction, the electrode 100 passes sequentially through the action areas of each ultrasonic generating component 11. Each ultrasonic generating component emits ultrasonic waves towards the electrode surface, applying continuous and multiple vibrations to the magnetic particles. This embodiment, by arranging multiple ultrasonic generating components sequentially along the first direction, enables multiple ultrasonic emission onto the electrode surface, extending the duration and number of ultrasonic waves' impact on the magnetic particles. This makes it easier to loosen or lift firmly attached micro-magnetic particles from the electrode surface, thereby improving the capture efficiency of the subsequent magnetic adsorption device.
[0055] In some embodiments, a plurality of ultrasonic generating components 11 arranged sequentially along a first direction are configured to emit ultrasonic waves of different frequencies. For example... Figure 1 and 2 As shown, multiple ultrasonic generating components 11 arranged sequentially along a first direction are configured to emit ultrasonic waves of different frequencies. For example, the first ultrasonic generating component upstream emits ultrasonic waves at a frequency of 20 kHz, the middle ultrasonic generating component emits ultrasonic waves at a frequency of 40 kHz, and the downstream component emits ultrasonic waves at a frequency of 100 kHz. Magnetic particles of different sizes and materials have different resonant frequencies. When the ultrasonic frequency matches the natural frequency of the particles, the vibration effect generated by the particles is better, and they are easier to detach from the electrode surface. This embodiment, by setting multi-band ultrasonic waves, can selectively resonate and desorb magnetic particles of different size ranges (e.g., 0.1 μm to 25 μm) present on the electrode surface, so that particles of various sizes can obtain effective vibration energy. Compared with single-frequency ultrasonic waves, the multi-band configuration significantly improves the cleaning ability of magnetic particles across the entire particle size range, especially for tiny particles that are difficult to remove by traditional methods.
[0056] In some embodiments, the ultrasonic generating assembly 11 includes a plurality of ultrasonic transmitters 111 arranged sequentially along a second direction perpendicular to the first direction. For example... Figures 1 to 3 As shown, each ultrasonic generating component 11 is composed of multiple ultrasonic transmitters 111 arranged sequentially along a second direction (the second direction is perpendicular to the first direction, as indicated by the Y direction in the figure), thus forming a one-dimensional linear array or matrix array arrangement. During demagnetization, when the electrode 100 moves relative to the magnetic particle cleaning device on its surface along the first direction, the electrode 100 typically has a large width, limiting the sound field coverage of a single ultrasonic transmitter. This embodiment achieves full coverage of the entire width of the electrode by arranging multiple ultrasonic transmitters along the second direction, ensuring that the electrode surface is effectively subjected to ultrasonic waves in the width direction, thus thoroughly cleaning the electrode in the width direction. Multiple transmitters can be independently controlled, facilitating adjustment of the effective emission area according to the electrode width and adapting to the production needs of electrodes of different specifications.
[0057] In some embodiments, the magnetic adsorption device 2 includes a magnetic adsorption surface 220 for generating magnetic force on magnetic particles. The magnetic adsorption device 2 includes a plurality of magnets 21 and a plurality of magnetic conductive elements 22 arranged along a first direction. Adjacent magnets 21 are connected by a magnetic conductive element 22 in a parallel manner. Along the first direction, the magnetic field strength of the plurality of magnetically conductive regions on the magnetic adsorption surface 220 corresponding to the plurality of magnetically conductive elements 22 increases sequentially. Figure 1 and Figure 4 As shown, the magnetic adsorption device 2 includes a plurality of magnets 21 and a plurality of magnetically conductive elements 22 arranged sequentially along a first direction. The magnetic adsorption device 2 has a magnetic adsorption surface 220 facing the pole piece during demagnetization. In such... Figure 4 In the illustrated embodiment, a plurality of magnets 21 and a plurality of magnetic conductive elements 22 arranged along a first direction form a cuboid magnetic attractant. The magnetic attractant device 2 also includes a mounting frame 23 that encloses them. The mounting frame 23 surrounds five of the six faces of the cuboid magnetic attractant, leaving one face exposed to the outside. Figure 4The downward-facing surface is shown. The mounting bracket 23 has a magnetic field shielding function, capable of shielding the magnetic field of five out of the six faces of the cuboid magnetic attractor, allowing the magnetic force to be more concentrated on the magnetic attractor surface. Two adjacent magnets 21 are arranged with the same magnetic poles facing each other (e.g., N pole to N pole, or S pole to S pole), and a magnetic conductor 22 (made of a highly permeable magnetic material such as pure iron) is placed between the two magnets 21. This "like poles repel each other" arrangement causes the magnetic field lines to be emitted from the end faces of the magnets and concentrated through the magnetic conductor 22, forming a strong magnetic field region on the surface of the magnetic conductor 22. The magnetic field strength of the magnetically conductive regions on the magnetically absorbing surface 220 corresponding to each magnetically conductive element 22 increases sequentially along the first direction. This means that the magnetic field strength of the corresponding regions on the magnetically absorbing surface of each magnetically conductive element 22 increases sequentially. For example, when there are multiple magnetically conductive elements 22, the width of the magnetically conductive element with the smallest width along the first direction on the magnetically absorbing surface is taken as the reference width. The region on the magnetically absorbing surface of each magnetically conductive element along the center line of the first direction, with each region having half the reference width on either side, is the corresponding magnetically conductive region. The region on the magnetically absorbing surface of each magnetically conductive element with the reference width in the middle is the corresponding magnetically conductive region. Along the first direction, for example, from upstream to downstream, the magnetic field strength gradually increases from 0.6T to 1.6T. In this embodiment, by setting the magnetic field strength of multiple magnetically conductive regions corresponding to multiple magnetically conductive elements 22 on the magnetically attracted surface 220 along the first direction to increase sequentially, the magnetic particles on the electrode 100 that are easily attracted, such as larger-diameter magnetic particles, are attracted first during the demagnetization process when the electrode 100 moves relative to the magnetic particle cleaning device on the electrode surface. The magnetic particles that are difficult to be attracted will encounter magnetically conductive regions with greater magnetic field strength during relative movement and be attracted. Through graded adsorption, demagnetization can be carried out more efficiently and thoroughly.
[0058] In some embodiments, the thickness of the plurality of magnetically conductive elements 22 decreases sequentially along the first direction. For example... Figure 4As shown, the thickness of the multiple magnetically conductive elements 22 along the first direction is not uniform, but decreases progressively. For example, the magnetically conductive element located at the upstream end along the first direction has the largest thickness (e.g., 5 mm), followed by the middle ones, and the magnetically conductive element at the downstream end has the smallest thickness (e.g., 0.6 mm). The thickness of the magnetically conductive element 22 determines the degree of convergence of magnetic field lines from the magnet 21 to the magnetic attraction surface 220. The smaller the thickness, the more strongly the magnetic field lines are compressed and converged, and the higher the surface magnetic field strength. By making the thickness of the magnetically conductive elements decrease sequentially along the first direction, a magnetically conductive region with gradually increasing magnetic field strength from upstream to downstream can be formed on the magnetic attraction surface 220. This embodiment achieves changes in magnetic field strength without using magnets with different properties through the design of varying magnetically conductive element thickness. Furthermore, in the embodiment shown in the figure, the multiple magnets 21 are identical permanent magnets. The magnets 21 on both sides of the magnetic conductor are of the same type, and the magnetic lines of force entering the magnetic conductor are symmetrical. As a result, the magnetic lines of force output from the magnetic surface through the magnetic conductor are more perpendicular to the magnetic surface, which further increases the magnetic attraction force on the magnetic particles and improves the magnetic attraction effect.
[0059] In some embodiments, a magnetic particle cleaning system for electrode surfaces is also disclosed. This system includes any of the aforementioned magnetic particle cleaning devices and an electrode. A vibration generating device is used to vibrate the magnetic particles on the electrode surface, and a magnetic adsorption device 2 is used to magnetically adsorb the vibrated magnetic particles. In this embodiment, the magnetic particle cleaning device for electrode surfaces uses a vibration generating device and a magnetic adsorption device 2 arranged sequentially along a first direction. By first setting up the vibration generating device, the magnetic particles firmly attached to the electrode surface are "loosened" or "detached" through vibration, thus removing them from surface adsorption forces such as electrostatic forces and van der Waals forces. Subsequently, the magnetic adsorption device 2, arranged in the same direction, magnetically adsorbs these loosened or detached particles. This coupled working mode of "vibration separation followed by magnetic capture" avoids the drawback of relying solely on magnetic attraction to overcome the initial adhesion of magnetic particles, significantly improving overall cleaning efficiency and final cleanliness. Simultaneously, the entire cleaning process is non-contact, effectively avoiding physical damage such as scratches and powdering to the fragile electrode surface coating or foil caused by mechanical scraping, ensuring the quality of the electrode.
[0060] In some embodiments, when the magnetic adsorption device 2 magnetically adsorbs magnetic particles, the electrode moves relative to the magnetic particle cleaning device on the electrode surface along a first direction, and the vibration generating device along the first direction is located upstream of the magnetic adsorption device 2. The movement of the electrode relative to the magnetic particle cleaning device along the first direction can be illustrated by the magnetic particle cleaning device on the electrode surface remaining stationary, allowing the electrode to move along the first direction under the action of a roller mechanism or similar mechanism. In some embodiments not shown, the electrode may also remain stationary while the magnetic particle cleaning device on the electrode surface moves in the opposite direction to the first direction. During demagnetization, the electrode moves relative to the magnetic particle cleaning device along the first direction, first passing the upstream vibration generating device, which emits ultrasonic waves or applies other forms of vibration to the electrode surface, causing the magnetic particles attached to the electrode surface to gain an initial velocity to detach from the substrate or to be "lifted" into a loose, suspended state. Subsequently, the electrode continues to move along the first direction to the downstream magnetic adsorption device 2, where the loose or suspended magnetic particles are adsorbed onto the magnetic surface 220, achieving separation of the magnetic particles from the electrode. By placing the vibration generator upstream of the magnetic adsorption device 2, the coordinated operation of "vibration desorption followed by magnetic capture" is ensured, thereby achieving a highly efficient demagnetization effect.
[0061] In some embodiments, the electrode surface magnetic particle cleaning system includes two electrode surface magnetic particle cleaning devices located on opposite sides of the electrode in the thickness direction. The vibration generating device includes an ultrasonic generator 1, and the magnetic adsorption device 2 includes a magnetic adsorption surface 220 for generating magnetic force on the magnetic particles. The magnetic adsorption surface 220 and the ultrasonic generator 1 of one magnetic adsorption device face one side of the electrode surface and emit ultrasonic waves to that surface, while the magnetic adsorption surface 220 and the ultrasonic generator 1 of the other magnetic adsorption device face the other side of the electrode surface and emit ultrasonic waves to that surface. The electrode is relatively thin and has two surfaces, such as... Figure 1 The image shows the upper and lower surfaces of the electrode. Both surfaces may be contaminated with magnetic particles. By arranging a magnetic particle cleaning device on each side of the electrode in this system, both surfaces can be cleaned at once, improving cleaning efficiency and avoiding the complexity and risk of electrode damage associated with single-sided cleaning followed by flipping and reprocessing.
[0062] The following is combined Figures 1 to 4 A specific embodiment is given to further illustrate this application.
[0063] In this embodiment, the electrode surface magnetic particle cleaning system includes an electrode 100 and two sets of electrode surface magnetic particle cleaning devices respectively arranged on the upper and lower sides of the electrode 100. Each set of electrode surface magnetic particle cleaning devices includes a vibration generating device and a magnetic adsorption device 2 arranged sequentially along a first direction, wherein the vibration generating device is an ultrasonic generator 1. During demagnetization, the electrode 100 moves relative to the electrode surface magnetic particle cleaning device along the first direction, and along the first direction, the ultrasonic generator 1 is located upstream of the magnetic adsorption device 2.
[0064] The ultrasonic generator 1 includes a plurality of ultrasonic generating components 11 arranged sequentially along a first direction. Each ultrasonic generating component 11 further includes a plurality of ultrasonic transmitters 111 arranged sequentially along a second direction perpendicular to the first direction, thereby forming a matrix array arrangement to achieve full coverage of the entire width of the electrode. The plurality of ultrasonic generating components 11 arranged sequentially along the first direction are configured to emit ultrasonic waves of different frequencies, covering a frequency range from 20kHz to 100kHz.
[0065] The magnetic adsorption device 2 includes a magnetic adsorption surface 220 for generating magnetic force on magnetic particles. Inside the surface 220 are multiple identical permanent magnets 21 arranged along a first direction, and multiple magnetically conductive elements 22 made of a highly permeable material. Adjacent magnets 21 are connected by a magnetically conductive element 22 in a parallel manner. Along the first direction, the thickness of the multiple magnetically conductive elements 22 decreases sequentially, causing the magnetic field strength of multiple magnetically conductive regions on the magnetic adsorption surface 220 corresponding to the multiple magnetically conductive elements 22 to increase sequentially, forming a magnetic field strength that increases sequentially from upstream to downstream.
[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.
Claims
1. A magnetic particle cleaning device for electrode surface, used to remove magnetic particles from the surface of an electrode (100), characterized in that, include: A vibration generating device for vibrating magnetic particles on the surface of an electrode (100); A magnetic adsorption device (2) is arranged sequentially with the vibration generating device along a first direction for magnetically adsorbing the magnetic particles after the vibration generating device has vibrated.
2. The magnetic particle cleaning device for electrode surfaces as described in claim 1, characterized in that, The vibration generating device includes an ultrasonic generator (1) for emitting ultrasonic waves onto the surface of the electrode (100).
3. The magnetic particle cleaning device for electrode surfaces as described in claim 2, characterized in that, The ultrasonic generator (1) includes a plurality of ultrasonic generating components (11) arranged sequentially along a first direction.
4. The magnetic particle cleaning device for electrode surfaces as described in claim 3, characterized in that, The plurality of ultrasonic generating components (11) arranged sequentially along the first direction are configured to emit ultrasonic waves of different frequencies.
5. The magnetic particle cleaning device for electrode surfaces as described in claim 3 or 4, characterized in that, The ultrasonic generating assembly (11) includes a plurality of ultrasonic transmitters (111) arranged sequentially along a second direction perpendicular to the first direction.
6. The magnetic particle cleaning device for electrode surfaces as described in claim 1, characterized in that, The magnetic adsorption device (2) includes a magnetic adsorption surface (220) for generating magnetic force to the magnetic particles. The magnetic adsorption device (2) includes a plurality of magnets (21) and a plurality of magnetic conductive elements (22) arranged along a first direction. Adjacent magnets (21) are connected by a magnetic conductive element (22) in a parallel manner. Along the first direction, the magnetic field strength of a plurality of magnetically conductive regions on the magnetic adsorption surface (220) corresponding to the plurality of magnetic conductive elements (22) increases sequentially.
7. The magnetic particle cleaning device for electrode surfaces as described in claim 6, characterized in that, Along the first direction, the thickness of the plurality of magnetic conductive elements (22) decreases sequentially along the first direction.
8. The magnetic particle cleaning device for electrode surfaces as described in claim 7, characterized in that, The plurality of magnets (21) are the same permanent magnets.
9. A magnetic particle cleaning system for electrode surfaces, characterized in that, The device includes a magnetic particle cleaning device for electrode surface as described in any one of claims 1 to 8 and an electrode (100), wherein the vibration generating device is used to vibrate the magnetic particles on the surface of the electrode (100), and the magnetic adsorption device (2) is used to magnetically adsorb the magnetic particles vibrated by the vibration generating device.
10. The magnetic particle cleaning system for electrode surfaces as described in claim 9, characterized in that, When the magnetic adsorption device (2) magnetically adsorbs magnetic particles, the electrode (100) moves relative to the magnetic particle cleaning device on the electrode surface along a first direction, and the vibration generating device is located upstream of the magnetic adsorption device (2) along the first direction.
11. The magnetic particle cleaning system for electrode surfaces as described in claim 9 or 10, characterized in that, The device includes two magnetic particle cleaning devices for the electrode surface located on both sides of the electrode (100) in the thickness direction. The vibration generating device includes an ultrasonic generator (1). The magnetic adsorption device (2) includes a magnetic adsorption surface (220) for generating magnetic force to the magnetic particles. The magnetic adsorption surface (220) of one magnetic adsorption device (2) and the ultrasonic generator (1) are respectively facing one side of the electrode (100) and emitting ultrasonic waves to that surface. The magnetic adsorption surface (220) of the other magnetic adsorption device (2) and the ultrasonic generator (1) are respectively facing the other side of the electrode (100) and emitting ultrasonic waves to that surface.