Cleaning device and battery cell production line

Abstract

The application discloses a cleaning device and a battery monomer production line. The cleaning device is used for cleaning the particles of the pole piece, and comprises a moving unit and a vibration dust removal unit. The moving unit comprises a first moving roller and a second moving roller. In the up-down direction, the first moving roller and the second moving roller are used for clamping the first side edge area of the base body of the pole piece, so as to loosen the particles by applying radial pressure and tangential friction to the first side edge area, and the side edge of the first side edge area is connected with a tab. The vibration dust removal unit is used for applying vibration to the first side edge area treated by the moving unit, so that the particles are separated from the surface of the pole piece. In the cleaning device, the particles are separated from the surface of the pole piece by loosening first and then vibrating, so that the particles remaining on the pole piece can be removed to a certain extent, the situation that the particles pierce the diaphragm to cause internal short circuit of the battery monomer in the subsequent process is avoided, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cleaning device and a production line for battery cells. Background Technology

[0002] In lithium battery production, copper and aluminum metal debris (particle size 20-200μm) generated during electrode slitting / die-cutting processes easily adheres to the edges of the electrodes. If these conductive particles are not removed, they may puncture the separator after the battery is wound / stacked, causing an internal short circuit in the cell and posing a risk of thermal runaway. Utility Model Content

[0003] In view of the above problems, this application provides a cleaning device and a production line for battery cells, which can solve the problem of particulate matter remaining on the electrode to a certain extent.

[0004] In a first aspect, some embodiments of this application provide a cleaning device for cleaning particulate matter on electrode sheets, the cleaning device comprising: The actuation unit includes a first actuation roller and a second actuation roller. In the vertical direction, the first actuation roller and the second actuation roller are used to clamp the first side area of ​​the electrode substrate, thereby applying radial pressure and tangential friction to the first side area to loosen the particles. An electrode tab is connected to the side of the first side area. A vibration dust removal unit is used to apply vibration to the first side area after it has been processed by the action unit, so that the particles are removed from the surface of the electrode.

[0005] In the aforementioned cleaning device, the particles are removed from the electrode surface by first loosening and then vibrating to remove them. This can remove residual particles from the electrode to a certain extent, preventing particles from piercing the separator and causing a short circuit inside the battery cell in subsequent processes, thus improving the reliability of the battery cell.

[0006] In some embodiments, the actuation unit is further configured to adjust the distance between the first actuation roller and the second actuation roller, thereby adjusting the pressure applied by the first actuation roller and the second actuation roller to the first side region of the substrate.

[0007] The above embodiments can be flexibly adapted to particulate matter removal scenarios under different conditions.

[0008] In some embodiments, the distance between the first actuating roller and the second actuating roller is 50% to 70% of the thickness of the substrate and is greater than the depth to which the particles are embedded in the substrate.

[0009] The above embodiments improve the cleaning effect on particulate matter.

[0010] In some embodiments, at least one of the first and second actuating rollers is covered with an elastic layer on its circumferential side.

[0011] In the above embodiments, pressure can be buffered and frictional resistance can be increased to a certain extent.

[0012] In some embodiments, the actuation unit includes a pressure sensor for detecting the pressure exerted by the first actuation roller and the second actuation roller on a first side region of the substrate.

[0013] In the above embodiments, the feedback can be used to adjust the gap between the first and second action rollers, thereby improving the particulate matter removal efficiency to a certain extent.

[0014] In some embodiments, the pressure applied by the first actuating roller and the second actuating roller to the first side region of the substrate is 5 to 50 N / cm².

[0015] In the above embodiments, the pressure applied by the action unit to the first side region of the substrate is 5 to 50 N / cm², which can effectively loosen the particles on the electrode to a certain extent without damaging the electrode.

[0016] In some embodiments, the vibration dust removal unit includes an ultrasonic generator for applying ultrasonic waves to the first side region after it has been processed by the actuation unit, thereby applying vibration to the first side region after it has been processed by the actuation unit.

[0017] In the above embodiments, the ultrasonic generator is used to apply ultrasonic waves to the first side area after it has been processed by the action unit, so that the particles on the first side vibrate and detach from the electrode surface, thereby removing the particles remaining on the electrode to a certain extent.

[0018] In some embodiments, the ultrasonic generator produces ultrasonic waves with a frequency of 80 to 150 Hz and an amplitude of 0.2 to 0.4 mm.

[0019] In the above embodiments, particulate matter can be effectively removed from the electrode to a certain extent without damaging the electrode.

[0020] In some embodiments, the coverage area of ​​the ultrasonic wave is from the first side region of the substrate to the root region of the electrode, and the root region of the electrode is the area 5 to 10 mm away from the connection between the electrode and the substrate in the direction close to the free end of the electrode.

[0021] In the above embodiments, the electrode tabs are prevented from deforming or breaking due to the vibration of ultrasonic waves.

[0022] In some embodiments, the cleaning device includes a negative pressure unit for collecting the particulate matter.

[0023] In the above embodiments, the negative pressure unit can collect particulate matter that has detached from the electrode surface in a timely manner, thereby preventing secondary contamination of the electrode.

[0024] In some embodiments, the negative pressure unit includes a dust suction port located below the substrate, and the vibration dust removal unit is located above the substrate.

[0025] In the above embodiments, particulate matter can be more easily collected by the negative pressure unit, thereby improving the dust collection efficiency to a certain extent.

[0026] In some embodiments, the dust suction port and the vibration dust removal unit are arranged correspondingly in the vertical direction.

[0027] In the above embodiments, the suction port and the vibration dust removal unit are arranged correspondingly in the vertical direction, which makes it easier for the negative pressure unit to collect particles that have been loosened and detached from the electrode surface, thereby further improving the suction efficiency.

[0028] In some embodiments, the negative pressure unit includes a pipe and a vent plate. One end of the pipe is provided with the dust suction port, and the vent plate closes the dust suction port. The vent plate is provided with a plurality of through holes that communicate with the inside of the pipe, and the diameter of the through holes is larger than the particle size of the particulate matter.

[0029] In the above embodiments, the negative pressure unit can directionally collect particles that have been loosened and detached from the electrode surface.

[0030] In some embodiments, the airflow velocity formed by the negative pressure unit at the suction port is ≥15m / s.

[0031] The above embodiments can optimize the particulate matter removal effect to a certain extent.

[0032] In some embodiments, the cleaning device includes a detection unit for detecting target particles in the particles collected by the negative pressure unit, wherein the particle size of the target particles is greater than a set value, and the proportion of the target particles to the total number of collected particles is greater than a set proportion within a preset time period, the action unit is used to increase the pressure applied to the first side region of the substrate, and / or, the vibration dust removal unit is used to increase the frequency of vibration on the first side region of the substrate.

[0033] The above embodiments improve the particulate matter removal efficiency.

[0034] In some embodiments, the cleaning device includes a transmission unit for transmitting the electrode sheet.

[0035] The above embodiments improve the removal efficiency to a certain extent.

[0036] In some embodiments, the transmission unit includes a first pair of roller transmission mechanisms and a second pair of roller transmission mechanisms. In the transmission direction of the electrode sheet, the first pair of roller transmission mechanisms are located downstream of the vibration dust removal unit, and the second pair of roller transmission mechanisms are located upstream of the actuation unit. The actuation unit is located upstream of the vibration dust removal unit.

[0037] The above embodiments are preparations for the subsequent manufacturing process of battery cells.

[0038] Secondly, this application provides a production line for a single battery cell, the production line including the cleaning device described in any of the above embodiments.

[0039] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 This is an exploded view of a battery device provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the electrode provided in some embodiments of this application; Figure 4 A schematic diagram of the production line for a single battery cell provided in some embodiments of this application; Figures 5 to 7 This is a schematic diagram of the structure of a cleaning device provided in some embodiments of this application; Figure 8 This is a cross-sectional schematic diagram of an action unit provided in some embodiments of this application.

[0041] The reference numerals in the specific embodiments are as follows: 1000 electrical appliances; Battery unit 100, controller 200, motor 300; Battery cell 10, casing 12, electrode 14, substrate 141, first side region 141a, tab 143, tab root region 143a; Box 20, first box 21, second box 22; Production line 2000; Laser cutting device 40; Cleaning device 60, actuation unit 61, first actuating roller 612a, second actuating roller 612b, elastic layer 612c, vibration dust removal unit 63, negative pressure unit 65, dust suction port 651, pipe 653, collection box 655, detection unit 67, transmission unit 69, first pair of roller transmission mechanism 692, first transmission roller 692a, second transmission roller 692b, second pair of roller transmission mechanism 694. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0050] Currently, market trends show that the application scope of battery cells is expanding rapidly. Besides playing a crucial role in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, battery cells are also widely used in various electric vehicles such as electric bicycles, electric motorcycles, and electric cars. Furthermore, they are widely used in high-tech fields such as military equipment and aerospace. With the continuous expansion of battery cell applications, market demand is also continuously increasing.

[0051] In related technologies, copper and aluminum metal debris (particle size 20-200μm) generated during the slitting / die-cutting process of electrode sheets in lithium battery production easily adheres to the sides of the electrode tabs and the edges of the electrode sheets. If these conductive particles are not removed, they may puncture the separator after the battery is wound / stacked, causing an internal short circuit in the cell and resulting in the risk of thermal runaway. The industry problem of stubborn adhesion of metal particles (copper and aluminum debris) generated during electrode sheet slitting / die-cutting to the sides of the electrode tabs is specifically manifested as follows: 1) Complex adhesion mechanism: Micron-sized metal particles (20-200μm in diameter) partially melt and embed into the edge of the electrode coating or mechanically interlock with the metal foil substrate under the action of high-temperature friction and electrostatic action during cutting. Traditional cleaning methods are difficult to destroy the interfacial bonding force of these large molten metal particles; 2) Serious safety hazards: Residual particles may puncture the separator after battery winding / stacking, causing internal short circuits (such as thermal runaway). According to industry statistics, about 17% of battery cell failures are related to metal foreign objects; 3) Bottleneck in quality control: The existing visual inspection / AOI inspection has a failure rate of >35% for particles in hidden side positions, which leads to an increase in the self-discharge failure rate of battery cells (>500ppm).

[0052] Compared with traditional dust removal methods: 1) High-pressure air blowing: High-pressure airflow (0.5-0.8MPa) is difficult to overcome the van der Waals forces and electrostatic adsorption forces between particles and substrate, and the removal rate of particles larger than 50μm is <65%. Moreover, airflow disturbance causes secondary diffusion of particles, and even scatters them into the battery cell; 2) Brush cleaning: It is necessary to sacrifice the integrity of the coating in exchange for cleanliness. That is, the contact and friction between the nylon bristles and the electrode surface will cause the active coating to fall off (damage rate ≥3%), and the brush body itself is prone to residual particles, forming a source of pollution; 3) Electrostatic adsorption: It is ineffective for non-magnetic metals, the equipment cost is high (>2 million yuan / unit), and the traditional equipment needs to be shut down for adjustment (time ≥30min), the energy consumption is high (≥10kW / h), and the compatibility is poor.

[0053] Based on the above considerations, and addressing the limitation on the removal of residual particulate matter (such as metal particles) on the electrode sheets, this application provides a cleaning device and a production line for battery cells. A cleaning device is provided for cleaning particulate matter on the electrode sheets. The cleaning device includes an actuation unit and a vibration dust removal unit. The actuation unit includes a first actuating roller and a second actuating roller. In the vertical direction, the first and second actuating rollers clamp a first side region of the electrode sheet substrate, applying radial pressure and tangential friction to the first side region to loosen the particles. An electrode tab is connected to the side of the first side region. The vibration dust removal unit applies vibration to the first side region after it has been processed by the actuation unit, causing the particles to detach from the electrode sheet surface. In the above cleaning device, the particles are removed from the electrode sheet surface by first loosening and then vibrating to detach them. This effectively removes residual particulate matter from the electrode sheet to a certain extent, preventing particles from piercing the separator and causing internal short circuits in the battery cell during subsequent processes, thus improving the reliability of the battery cell.

[0054] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0055] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0056] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0057] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0058] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0059] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0060] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0061] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed housing space inside the enclosure to accommodate the individual battery cells. Here, "closed" refers to covering or closing; it can be sealed or not sealed. The first enclosure may be a top cover, and the second enclosure may be a bottom enclosure.

[0062] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating a closed storage space inside the enclosure to house the individual battery cells.

[0063] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0064] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device 1000 according to an embodiment of this application.

[0065] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 100, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0066] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0067] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 according to some embodiments of this application. The battery device 100 includes a housing 20 and a battery cell 10, with the battery cell 10 housed within the housing 20. The housing 20 provides accommodating space for the battery cell 10, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing 21 and a second housing 22, which overlap each other, jointly defining an accommodating space for accommodating the battery cell 10. The second housing 22 may be a hollow structure with one open end, and the first housing 21 may be a plate-like structure, with the first housing 21 covering the open side of the second housing 22 so that the first housing 21 and the second housing 22 jointly define the accommodating space; alternatively, the first housing 21 and the second housing 22 may both be hollow structures with one open side, with the open side of the first housing 21 covering the open side of the second housing 22. Of course, the box 20 formed by the first box 21 and the second box 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0068] In the battery device 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0069] Firstly, please refer to Figures 4 to 7 This application provides a cleaning device 60 in some embodiments for cleaning particulate matter on an electrode sheet 14. The cleaning device 60 includes an actuation unit 61 and a vibration dust removal unit 63. The actuation unit 61 includes a first actuation roller 612a and a second actuation roller 612b. In the vertical direction, the first actuation roller 612a and the second actuation roller 612b are used to clamp the first side region 141a of the substrate 141 of the electrode sheet 14, thereby applying radial pressure and tangential friction to the first side region 141a to loosen the particulate matter. An electrode tab 143 is connected to the side of the first side region 141a. The vibration dust removal unit 63 is used to apply vibration to the first side region 141a after it has been processed by the actuation unit 61, causing the particulate matter to detach from the surface of the electrode sheet 14.

[0070] Specifically, the battery cell 10 includes a housing 12 and an electrode assembly. The housing 12 of the battery cell 10 has a hollow structure, and its interior forms a space for accommodating the electrode assembly and electrolyte. The shape of the housing 12 can be determined according to the specific shape of the electrode assembly and design requirements, and this application does not impose any specific limitations on it.

[0071] The electrode assembly is the component in the battery cell 10 where the electrochemical reaction occurs. The electrode assembly includes electrode sheets 14 and a separator. The electrode sheets 14 can be stacked along the thickness direction of the battery cell 10 or arranged sequentially along the axial direction of the battery cell 10. The electrode sheets 14 include positive electrode sheets and negative electrode sheets, and the separator is located between the positive and negative electrode sheets. The portion of the electrode sheet 14 containing active material constitutes the substrate 141, and the portion of the electrode sheet 14 without active material each constitutes a tab 143. The tabs 143 of the positive electrode sheet and the tabs 143 of the negative electrode sheet can be located together at one end of the substrate 141 or respectively at both ends of the substrate 141.

[0072] Because the electrode 14 is prone to producing particulate matter (such as welding slag) after undergoing laser slitting and / or die-cutting processes, these particulate matter can be mainly divided into the following three categories: the first category refers to the particulate matter directly sputtered out during the laser welding process; the second category refers to the particulate matter that falls onto the surface near the electrode 143 during the cutting of the electrode tab 143; and the third category refers to some residual particulate matter present at the cutting edge of the electrode 14 under the high temperature environment of laser welding. The cleaning device 60 of this application embodiment mainly cleans the second type of particulate matter, which may include, but is not limited to, large molten metal particles. It is understood that the cleaning device 60 of this application embodiment can also process the first type of particulate matter and the second type of particulate matter to achieve cleaning.

[0073] Particulate matter easily adheres to the first side region 141a of the substrate 141. Please refer to... Figure 3 A tab 143 is connected to the side of the first side region 141a. Optionally, the first side region 141a is a region where the side of the substrate 141 connected to the tab 143 is spaced 3 mm to 5 mm apart in the direction close to the interior of the substrate 141.

[0074] The distance L1 between the side of the substrate 141 to which the tab 143 is connected and the direction closer to the interior of the substrate 141 is 3mm ≤ L1 ≤ 5mm. In one example, A = 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, or other values ​​greater than or equal to 3mm and less than or equal to 5mm.

[0075] The distance L1 between the side of the substrate 141 connected to the tab 143 and the interior of the substrate 141 can be specifically limited by simulation, experiment, test, simulation and other methods. This application does not make a specific limitation in this regard.

[0076] The actuation unit 61 of the cleaning device 60 applies radial pressure and tangential friction to the first side region 141a of the substrate 141 of the electrode 14, thereby generating shear stress at the interface between the particles and the surface of the substrate 141. When the shear stress exceeds the electrostatic adsorption force of the substrate 141 on the particles, the particles can be loosened for subsequent vibration dust removal. Furthermore, for larger particles adhering to the first side region 141a, the actuation unit 61 can loosen or break / crush the large particles into smaller particles; while for smaller particles adhering to the first side region 141a, the actuation unit 61 can loosen the small particles or break the molten bond between them and the first side region 141a.

[0077] Please combine Figures 5 to 7The first actuating roller 612a and the second actuating roller 612b of the actuating unit 61 are spaced apart on the upper and lower sides of the electrode 14 and can be used to clamp the first side region 141a of the substrate 141. Optionally, the first actuating roller 612a and the second actuating roller 612b rotate in opposite directions, so that the relative rotational motion between the first actuating roller 612a and the second actuating roller 612b can apply radial pressure and tangential friction to the first side region 141a of the substrate 141 to break the interfacial bonding force between the particles and the surface of the electrode 14, thereby loosening the particles adhering to the first side region 141a.

[0078] The vibration dust removal unit 63 of the cleaning device 60 is used to apply vibration to the first side area 141a after being processed by the action unit 61. The vibration can break the electrostatic adsorption force and van der Waals force bond between the particles and the substrate 141, thereby allowing the particles to detach from the surface of the electrode 14.

[0079] Optionally, when the action unit 61 is turned on, the vibration dust removal unit 63 is turned on to apply vibration to the first side region 141a.

[0080] Therefore, by using the method of loosening first and then vibrating to detach, the interfacial bonding force (including but not limited to electrostatic adsorption force and van der Waals force) between the particulate matter and the surface of the electrode 14 can be broken, causing the particulate matter to detach from the surface of the electrode 14. This can remove the residual particulate matter on the electrode 14 to a certain extent, avoiding the situation where particulate matter may puncture the separator in subsequent processes and cause internal short circuits in the battery cell 10, thereby improving the reliability of the battery cell 10.

[0081] According to some embodiments of this application, optionally, please refer to... Figures 5 to 6 The actuation unit 61 is also used to adjust the distance between the first actuation roller 612a and the second actuation roller 612b, thereby adjusting the pressure applied by the first actuation roller 612a and the second actuation roller 612b to the first side region 141a of the substrate 141.

[0082] Specifically, the distance between the first actuating roller 612a and the second actuating roller 612b can be understood as the gap between the two actuating rollers. By adjusting the distance between the first actuating roller 612a and the second actuating roller 612b, the first actuating roller 612a and the second actuating roller 612b and the electrode 14 are elastically deformed, thereby adjusting the contact area between the first actuating roller 612a and the second actuating roller 612b and the first side region 141a of the substrate 141, thereby adjusting the pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a.

[0083] Optionally, in some embodiments, the actuation unit 61 includes a drive unit connected to at least one of the first actuation roller 612a and the second actuation roller 612b. The drive unit is used to drive at least one of the first actuation roller 612a and the second actuation roller 612b to move in order to adjust the distance between the first actuation roller 612a and the second actuation roller 612b.

[0084] Optionally, please combine Figure 8 The distance between the first actuating roller 612a and the second actuating roller 612b is D, where 0.1mm ≤ D ≤ 1.0mm. In one example, D = 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, or other values ​​greater than or equal to 0.1mm and less than or equal to 1.0mm.

[0085] The specific value of the distance D between the first actuating roller 612a and the second actuating roller 612b can be specifically limited according to actual conditions, and this application does not make a specific limitation in this regard.

[0086] Therefore, the actuation unit 61 can adjust the distance between the first actuation roller 612a and the second actuation roller 612b, thereby adjusting the pressure applied by the first actuation roller 612a and the second actuation roller 612b to the first side region 141a of the substrate 141. This allows for adjustment of the radial pressure and tangential friction applied by the first actuation roller 612a and the second actuation roller 612b to the first side region 141a. At the same time, the actuation unit 61 can be compatible with substrates 141 of electrode sheets 14 of greater thickness, thus flexibly adapting to particulate matter removal scenarios under different conditions.

[0087] According to some embodiments of this application, optionally, please refer to... Figure 8 The distance between the first actuating roller 612a and the second actuating roller 612b is 50% to 70% of the thickness of the substrate 141 and is greater than the depth to which the particles are embedded in the substrate 141.

[0088] Specifically, in some embodiments, the distance between the first actuating roller 612a and the second actuating roller 612b is 50% to 70% of the thickness of the substrate 141. This allows the first actuating roller 612a and the second actuating roller 612b to exert sufficient pressure on the electrode 14, while leaving a margin to avoid excessive deformation of the electrode 14 or damage to the coating of the electrode 14. Optionally, the thickness of the electrode 14 is 80 to 200 μm (micrometers).

[0089] The distance between the first actuating roller 612a and the second actuating roller 612b is greater than the depth to which the particulate matter is embedded in the substrate 141. This prevents the particulate matter from forming a stronger bond with the electrode 14 surface due to excessive pressure. Instead, the smaller contact area with the actuating rollers leads to localized stress concentration, further weakening the interfacial bond between the particulate matter and the electrode 14, thus achieving effective loosening. The depth to which the particulate matter is embedded in the substrate 141 is the deformation amount of the actuating roller caused by elastic deformation due to contact with the particulate matter. Optionally, the deformation amount of the actuating roller caused by the particulate matter is 0.1 to 0.2 mm.

[0090] Therefore, the distance between the first actuating roller 612a and the second actuating roller 612b is 50% to 70% of the thickness of the substrate 141 and is greater than the depth of the particles embedded in the substrate 141. This allows the first actuating roller 612a and the second actuating roller 612b to provide sufficient pressure to the first side region 141a of the substrate 141. As a result, the radial pressure and tangential friction applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a are sufficient to break the interfacial bonding force between the particles and the electrode 14, thereby improving the cleaning effect of the particles.

[0091] According to some embodiments of this application, optionally, please refer to... Figure 8 At least one of the first actuating roller 612a and the second actuating roller 612b has an elastic layer 612c on its circumferential side.

[0092] Specifically, the elastic layer 612c is tightly fitted onto at least one of the circumferential side surfaces of the first actuating roller 612a and the second actuating roller 612b through processes including but not limited to interference fit and bonding. Optionally, the elastic layer 612c may be a composite layer made of elastic materials such as polyurethane, rubber, or silicone; this application does not specifically limit this.

[0093] In one embodiment, the circumferential side of the first actuating roller 612a is covered with an elastic layer 612c. In one embodiment, the circumferential side of the second actuating roller 612b is covered with an elastic layer 612c. In one embodiment, please refer to... Figure 8 An elastic layer 612c is fitted on the outer circumferential side of both the first action roller 612a and the second action roller 612b.

[0094] When the first side region 141a of the electrode 14 passes through the roll gap between the first actuating roller 612a and the second actuating roller 612b, the elastic layer 612c will undergo indentation deformation due to local pressure. This can optimize vibration parameters and buffer pressure to a certain extent, thereby preventing the coating of the electrode 14 from peeling off or being damaged, and protecting the integrity of the electrode 14 to a certain extent. At the same time, the high coefficient of friction of the elastic layer 612c makes it easier for the electrode 14 to enter the roll gap between the first actuating roller 612a and the second actuating roller 612b, preventing the electrode 14 from slipping. By increasing the frictional resistance between the elastic layer 612c and the metal particles, the tangential frictional force applied by the actuating unit 61 to the first side region 141a of the substrate 141 is increased, making it easier to loosen the particles remaining on the electrode 14.

[0095] Optionally, the hardness of the elastic layer 612c can be 80A (±5).

[0096] Therefore, at least one of the first actuating roller 612a and the second actuating roller 612b is provided with an elastic layer 612c on its circumferential side, which can buffer the pressure and increase the frictional resistance to a certain extent, thereby avoiding damage to the electrode 14 to a certain extent and increasing the tangential frictional force applied by the actuating unit 61 to the first side region 141a of the substrate 141.

[0097] According to some embodiments of this application, optionally, the actuation unit 61 includes a pressure sensor for detecting the pressure exerted by the first actuation roller 612a and the second actuation roller 612b on the first side region 141a of the substrate 141.

[0098] Specifically, in some embodiments, when the first actuating roller 612a and the second actuating roller 612b of the actuating unit 61 clamp the base 141 and apply radial pressure and tangential friction to the first side region 141a of the base 141, the reaction force of the base 141 on the actuating rollers can be transmitted to the bearing through the roller shaft. The actuating rollers rotate around the roller shaft, and the bearing, as a supporting component, bears the reaction force of the radial pressure and tangential friction applied by the actuating unit 61 to the first side region 141a. Therefore, a pressure sensor can be installed at the bearing of one of the first actuating rollers 612a and the second actuating roller 612b. By detecting the force borne by the bearing, the pressure on the base 141 can be deduced. By detecting the pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a of the substrate 141, the pressure can be used as feedback to adjust the roller gap. That is, the distance between the first actuating roller 612a and the second actuating roller 612b can be adjusted so that the actuating rollers provide appropriate pressure to the first side region 141a, thereby effectively breaking the interfacial bonding force between the particles and the substrate 141 and loosening the particles, thus improving the particle removal efficiency to a certain extent.

[0099] In one embodiment, please combine Figures 5 to 7 The first actuating roller 612a is the active actuating roller, and the second actuating roller 612b is the passive actuating roller. The active actuating roller can be directly driven by a motor (including but not limited to a servo motor or a stepper motor), and moves the electrode 14 through rotational motion. The passive actuating roller is driven to rotate passively by friction with the electrode 14 or the active actuating roller, so that the first actuating roller 612a and the second actuating roller 612b apply radial pressure and tangential friction to the first side region 141a of the substrate 141. Since the force borne by the passive actuating roller is from the pressure applied to the substrate 141 by the active actuating roller, a pressure sensor can be placed at the bearing of the second actuating roller 612b, so that the pressure applied to the first side region 141a of the substrate 141 by the first actuating roller 612a and the second actuating roller 612b is detected more accurately.

[0100] Therefore, the pressure applied to the first side region 141a of the substrate 141 by the pressure sensor of the actuation unit 61 can be used as feedback to adjust the roller gap, thereby improving the particulate matter removal efficiency to a certain extent.

[0101] According to some embodiments of this application, optionally, the pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a of the substrate 141 is 5 to 50 N / cm² (Newtons per square centimeter).

[0102] Specifically, when the pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a of the substrate 141 is too low, the radial pressure and tangential friction applied by the actuating unit 61 to the first side region 141a are insufficient to break the interfacial bonding force between the particles and the electrode 14, resulting in fewer particles falling off the electrode 14 and poor cleaning effect. When the pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a of the substrate 141 is too high, the excessive radial pressure and tangential friction applied by the actuating unit 61 to the first side region 141a will cause the coating of the electrode 14 to peel off, resulting in damage to the electrode 14. Therefore, appropriate pressure is required to ensure the integrity of the electrode 14 while making it easy for the electrode 14 to detach from the substrate 14.

[0103] The pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a of the substrate 141 is FN, 5N / cm. 2 ≤FN≤50N / cm 2 In one example, FN = 5 N / cm 2 10N / cm 2 15N / cm2 20N / cm 2 25N / cm 2 30N / cm 2 35N / cm 2 40N / cm 2 45 N / cm 2 50N / cm 2 or greater than or equal to 5 N / cm 2 And less than or equal to 50 N / cm 2 Other values.

[0104] The pressure FN applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a of the substrate 141 can be specifically defined according to actual conditions, and this application does not make a specific limitation in this regard.

[0105] Therefore, the pressure applied by the first actuating roller 612a and the second actuating roller 612b to the first side region 141a is 5 to 50 N / cm², which can effectively loosen the particles on the electrode 14 to a certain extent without damaging the electrode 14.

[0106] According to some embodiments of this application, optionally, the vibration dust removal unit 63 includes an ultrasonic generator for applying ultrasonic waves to the first side region 141a after being processed by the action unit 61, thereby applying vibration to the first side region 141a after being processed by the action unit 61.

[0107] Specifically, after the first side region 141a of the substrate 141 of the electrode 14 is processed by the action unit 61, the ultrasonic generator of the vibration dust removal unit 63 applies ultrasonic waves to the first side region 141a. The ultrasonic waves can directly act on the first side region 141a to make the electrode 14 vibrate. Through the cavitation effect generated by the ultrasonic vibration, the interfacial bonding force between the particulate matter and the electrode 14 can be specifically destroyed, so that the particulate matter in the first side region 141a can be vibrated and detached from the surface of the electrode 14. This can remove the residual particulate matter on the electrode 14 to a certain extent, avoiding the situation where particulate matter may puncture the separator and cause a short circuit inside the battery cell 10 in subsequent processes, thus improving the reliability of the battery cell 10.

[0108] Therefore, the ultrasonic generator is used to apply ultrasonic waves to the first side region 141a after it has been processed by the action unit 61, so that the particles on the first side are vibrated and detached from the surface of the electrode 14, thereby removing the particles remaining on the electrode 14 to a certain extent.

[0109] According to some embodiments of this application, optionally, the ultrasonic generator produces ultrasonic waves with a frequency of 80 to 150 Hz and an amplitude of 0.2 to 0.4 mm.

[0110] Specifically, when the ultrasonic frequency and amplitude generated by the ultrasonic generator are too low, the vibration applied by the ultrasonic waves to the first side region 141a of the substrate 141 of the electrode 14 is too weak, resulting in particles adhering to the first side region 141a failing to detach from the electrode 14 or having only a few particles detach, leading to poor cleaning performance. When the ultrasonic frequency and amplitude generated by the ultrasonic generator are too high, the vibration applied by the ultrasonic waves to the first side region 141a is too strong, which can cause the coating of the electrode 14 to peel off to some extent, resulting in damage to the electrode 14. Therefore, the ultrasonic waves need suitable frequency and amplitude to ensure that particles can effectively detach from the electrode 14 while maintaining its integrity.

[0111] The ultrasonic frequency generated by the ultrasonic generator is f, where 80Hz ≤ f ≤ 150Hz. In one example, f = 80Hz, 87Hz, 94Hz, 101Hz, 108Hz, 115Hz, 122Hz, 129Hz, 136Hz, 143Hz, 150Hz, or other values ​​greater than or equal to 80Hz and less than or equal to 150Hz.

[0112] The ultrasonic wave amplitude produced by the ultrasonic generator is A, where 0.2 mm ≤ A ≤ 0.4 mm. In one example, A = 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.4 mm, or other values ​​greater than or equal to 0.2 mm and less than or equal to 0.4 mm.

[0113] The specific values ​​of the ultrasonic frequency f and amplitude A generated by the ultrasonic generator can be specifically defined through simulation, experiment, test, simulation, etc., and this application does not make specific limitations in this regard.

[0114] Therefore, the ultrasonic generator produces ultrasonic frequencies of 80 to 150 Hz and amplitudes of 0.2 to 0.4 mm, which can effectively remove particles from the electrode 14 without damaging the electrode 14.

[0115] According to some embodiments of this application, optionally, please refer to... Figure 3 The coverage area of ​​the ultrasound is from the first side region 141a of the substrate 141 to the root region 143a of the electrode. The root region 143a of the electrode is the area 5 to 10 mm away from the connection between the electrode 143 and the substrate 141 in the direction close to the free end of the electrode 143.

[0116] Specifically, because the tab 143 is thinner than the substrate 141, the thinner tab 143 has weaker resistance to bending and vibration, making it more susceptible to plastic deformation or fracture under mechanical stress. Therefore, please refer to... Figure 3 The coverage area of ​​the ultrasound is from the first side region 141a of the substrate 141 to the root region 143a of the tab. The root region 143a of the tab is the area 5 to 10 mm away from the connection between the tab 143 and the substrate 141 in the direction close to the free end of the tab 143. This ensures that the effective area of ​​the ultrasound does not cover the part of the tab 143 that is too far from the side of the substrate 141. This avoids, to some extent, the situation where the ultrasound vibrates the first side region 141a of the substrate 141 and affects the tab 143, causing the tab 143 to deform or break.

[0117] The distance L2 at the connection point between the tab 143 and the substrate 141 in the direction near the free end of the tab 143 is 5mm ≤ L2 ≤ 10mm. In one example, A = 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or other values ​​greater than or equal to 5mm and less than or equal to 10mm.

[0118] The distance L2 at the connection between the tab 143 and the substrate 141 in the direction near the free end of the tab 143 can be specifically limited by simulation, experiment, test, simulation and other methods. This application does not make a specific limitation in this regard.

[0119] Therefore, the coverage area of ​​the ultrasonic wave is from the first side region 141a of the substrate 141 to the root region 143a of the tab. The root region 143a of the tab is the area 5 to 10 mm away from the connection between the tab 143 and the substrate 141 in the direction close to the free end of the tab 143. This avoids the tab 143 from being deformed or broken by the vibration of the ultrasonic wave, and improves the reliability of the battery cell 10 to a certain extent.

[0120] According to some embodiments of this application, optionally, please refer to... Figures 5 to 7 The cleaning device 60 includes a negative pressure unit 65 for collecting particulate matter.

[0121] Optionally, the negative pressure unit 65 may include a vacuum generator, a HEPA filter cartridge (High Efficiency Particulate Air filter), and a collection box 655, which has a collection chamber. The vacuum generator uses compressed air generated by a positive pressure air source to reduce the pressure inside the collection chamber to below atmospheric pressure, creating a vacuum. This allows particulate matter to be collected into the collection chamber by the negative pressure airflow. The HEPA filter cartridge prevents dust or fine particulate matter in the air from damaging the vacuum generator or affecting subsequent detection.

[0122] Optionally, in one embodiment, the negative pressure unit 65 can be activated simultaneously with the vibration dust removal unit 63 to form a negative pressure area near the first side region 141a of the substrate 141 of the electrode 14. The negative pressure unit 65 can promptly collect particles that have detached from the surface of the electrode 14, thereby removing residual particles on the electrode 14 to a certain extent, preventing particles from being re-adsorbed onto the electrode 14 and causing contamination, and avoiding the possibility of particles piercing the separator and causing an internal short circuit in the battery cell 10 in subsequent processes, thus improving the reliability of the battery cell 10.

[0123] Optionally, in one embodiment, the negative pressure unit 65 may be activated to suck up the separated particulate matter after the vibration dust removal unit 63 has completed applying vibration to the first side region 141a.

[0124] Understandably, the negative pressure unit 65, once activated, can also collect other particulate matter scattered in the production environment, so that these particulate matter is removed before it comes into contact with the surface of the electrode 14, thereby achieving non-contact separation between the particulate matter and the surface of the electrode 14.

[0125] Therefore, the negative pressure unit 65 can collect particulate matter that has detached from the surface of the electrode 14 in a timely manner, thereby preventing secondary contamination of the electrode 14.

[0126] According to some embodiments of this application, optionally, please refer to... Figure 5 The negative pressure unit 65 includes a dust suction port 651, which is located below the base 141, and the vibration dust removal unit 63 is located above the base 141.

[0127] Specifically, the negative pressure unit 65 may include a suction port 651, and a vacuum generator is connected to the suction port 651. When the vacuum generator is working, a negative pressure can be formed near the suction port 651 to draw particles that have detached from the surface of the electrode 14 into the collection chamber of the negative pressure unit 65.

[0128] The vibration dust removal unit 63, located above the substrate 141, applies vibration to the first side region 141a of the substrate 141 after it has been processed by the actuation unit 61. This causes the particles to detach from the surface of the electrode 14 and fall downwards due to gravity. Therefore, by placing the suction port 651 below the substrate 141, the airflow direction formed at the suction port 651 is consistent with the direction in which the particles fall. Under the combined action of gravity and suction, the particles will naturally move towards the suction port 651, which can improve the dust removal efficiency to a certain extent.

[0129] Therefore, the suction port 651 is located below the base 141, and the vibration dust removal unit 63 is located above the base 141, which makes it easier for particulate matter to be collected by the negative pressure unit 65, thereby improving the suction efficiency to a certain extent.

[0130] Optionally, in a top view, a portion of the suction port 651 is located below the first side region 141a of the substrate 141, and another portion of the suction port 651 is located outside the first side region 141a of the substrate 141.

[0131] According to some embodiments of this application, optionally, please refer to... Figures 5 to 7 The dust suction port 651 and the vibration dust removal unit 63 are arranged correspondingly in the vertical direction.

[0132] Specifically, the dust suction port 651 and the vibration dust removal unit 63 are both spaced apart from the base 141 and are arranged correspondingly in the vertical direction. That is, in the vertical direction, the projection of the vibration dust removal unit 63 and the projection of the dust suction port 651 have an overlapping area.

[0133] After the first side region 141a of the substrate 141 of the electrode 14 is processed by the action unit 61, the first side region 141a moves to the vibration dust removal unit 63. The vibration dust removal unit 63 applies vibration to the first side region 141a to cause particles to detach from the surface of the electrode 14. Since the suction port 651 and the vibration dust removal unit 63 are correspondingly arranged in the vertical direction, the shaken-off particles can be quickly collected into the collection chamber of the negative pressure unit 65 through the suction port 651, which improves the dust removal efficiency to a certain extent.

[0134] Therefore, the suction port 651 and the vibration dust removal unit 63 are arranged correspondingly in the vertical direction, which makes it easier for the negative pressure unit 65 to collect particles that have been loosened and detached from the surface of the electrode plate 14, thereby further improving the suction efficiency.

[0135] According to some embodiments of this application, optionally, the negative pressure unit 65 includes a pipe 653 and a vent plate. One end of the pipe 653 is provided with a dust suction port 651, and the vent plate closes the dust suction port 651. The vent plate is provided with a plurality of through holes that communicate with the inside of the pipe 653, and the diameter of the through holes is larger than the particle size.

[0136] Specifically, a vent plate is located at and seals the dust inlet 651. The vent plate has multiple through holes that communicate with the interior of the pipe 653. The vacuum generator of the negative pressure unit 65 can generate negative pressure airflow at the through holes. The number and shape of the through holes can be specifically limited according to actual conditions, and this application does not make specific limitations in this regard.

[0137] Optionally, the other end of the pipe 653 is connected to the collection box 655 of the negative pressure unit 65, and the inside of the pipe 653 is in communication with the collection chamber of the collection box 655.

[0138] When the vacuum generator is working, the multiple through holes of the vent plate can divide the large airflow formed at the original suction port 651 into multiple small airflows. Through the opening direction of the through holes, the airflow can be forced to flow along a preset path in the opening direction, thereby forming a directional airflow to capture particulate matter. This allows the particulate matter to be directionally collected into the collection chamber of the negative pressure unit 65 through the suction port 651, thereby improving the suction efficiency.

[0139] The aperture of the through hole is larger than the particle size, so that particles detached from the electrode 14 can smoothly pass through the through hole and enter the collection chamber of the negative pressure unit 65. The aperture of the through hole can be specifically defined by simulation, experiment, test, simulation, etc., and this application does not make a specific limitation in this regard.

[0140] Therefore, the negative pressure unit 65 includes a vent plate with multiple through holes that communicate with the inside of the pipe 653. The diameter of the through holes is larger than the particle size, so that the negative pressure unit 65 can collect the particles that have been loosened and detached from the surface of the electrode 14 in a directional manner.

[0141] According to some embodiments of this application, optionally, the airflow velocity formed by the negative pressure unit 65 at the suction port 651 is ≥15m / s (meters per second).

[0142] Specifically, when the airflow velocity formed by the negative pressure unit 65 at the suction port 651 is too low, an effective vacuum cannot be formed in the collection chamber of the negative pressure unit 65, thus failing to effectively capture particulate matter and resulting in poor particulate matter removal. Therefore, a suitable airflow velocity can, to a certain extent, ensure that the vacuum suction meets the actual needs, and can completely remove particulate matter the instant it leaves the surface of the electrode 14, thereby eliminating the possibility of secondary pollution.

[0143] The airflow velocity formed by the negative pressure unit 65 at the suction port 651 is v, where v ≥ 15 m / s. In one example, v = 15 m / s, 16 m / s, 17 m / s, 18 m / s, 19 m / s, 20 m / s, 21 m / s, 22 m / s, 23 m / s, 24 m / s, or other values ​​greater than or equal to 15 m / s. The airflow velocity v formed by the negative pressure unit 65 at the suction port 651 can be specifically limited by simulation, experiment, test, modeling, etc., and this application does not make a specific limitation in this regard. The upper limit of the airflow velocity formed by the negative pressure unit 65 at the suction port 651 can be determined by factors such as the power of the vacuum generator and the amount of compressed air.

[0144] Optionally, when the airflow velocity v ≥ 15 m / s, the turbulence of the airflow is ≤ 5%.

[0145] Therefore, the airflow velocity formed by the negative pressure unit 65 at the suction port 651 is ≥15m / s, which can optimize the particulate matter removal effect to a certain extent.

[0146] According to some embodiments of this application, optionally, please refer to... Figure 4 The cleaning device 60 includes a detection unit 67 for detecting target particles in the particles collected by the negative pressure unit 65. If the particle size of the target particles is greater than a set value, and the proportion of the target particles to the total number of collected particles is greater than a set proportion within a preset time period, the action unit 61 is used to increase the pressure applied to the first side region 141a of the substrate 141, and / or, the vibration dust removal unit 63 is used to increase the frequency of vibration of the first side region 141a of the substrate 141.

[0147] Specifically, during the particulate matter collection process of the negative pressure unit 65, the detection unit 67 detects the particulate matter collected within a preset time period to determine the proportion of the target particulate matter to the total number of collected particulate matter. The interfacial bonding force between the target particulate matter and the electrode 14 is relatively large. The particle size of the target particulate matter is larger than a set value, optionally 50 μm. The preset time period can be specifically limited according to simulation, testing, modeling, experimentation, etc., and this application does not make a specific limitation in this regard.

[0148] In one embodiment, the detection unit 67 may include an optical sensor for emitting detection light toward the particles collected by the negative pressure unit 65, and for receiving and processing the detection light scattered and / or reflected by the particles to convert it into an electrical signal. The proportion of the target particles to the total number of collected particles is detected by analyzing the changes in the electrical signal. Optionally, there is a mapping relationship between the proportion of the target particles to the total number of collected particles and the electrical signal.

[0149] Because particles of different sizes scatter and / or reflect detection light at different angles and intensities, larger particles generally cause greater scattering and / or reflection, resulting in stronger intensity of the scattered and / or reflected light. Smaller particles, on the other hand, primarily produce smaller scattering and / or reflection, leading to weaker intensity of the scattered and / or reflected light. When multiple particles are present, each particle scatters and / or reflects the detection light. The optical sensor receives this scattered and / or reflected light and converts it into an electrical signal. These electrical signals are superimposed, and the contribution of particles of different sizes to the electrical signal varies. Therefore, the optical sensor can determine the proportion of the target particle in the total number of collected particles by analyzing the mapping relationship between the changes in the electrical signal and the proportion of the target particle to the total number of collected particles.

[0150] If the proportion of target particles to the total number of collected particles exceeds a set proportion within a preset time period, the action unit 61 increases the pressure applied to the first side region 141a of the substrate 141, and / or the vibration dust removal unit 63 increases the frequency of vibration on the first side region 141a of the substrate 141. In one example, the set proportion is 10%, and the preset time period is 1 minute.

[0151] In one embodiment, if the proportion of target particles to the total number of collected particles is greater than a set proportion within a preset time period, the action unit 61 increases the pressure applied to the first side region 141a of the substrate 141 to break the interfacial bonding force between the target particles and the electrode 14, making the target particles in the first side region 141a easier to loosen.

[0152] In one embodiment, if the proportion of target particles to the total number of collected particles is greater than a set proportion within a preset time period, the vibration dust removal unit 63 increases the frequency of vibration on the first side region 141a of the substrate 141 to break the interfacial bonding force between the target particles and the electrode 14, making it easier for the target particles in the first side region 141a to be vibrated off.

[0153] In one embodiment, if the proportion of target particles to the total number of collected particles is greater than a set proportion within a preset time period, the action unit 61 increases the pressure applied to the first side region 141a of the substrate 141, and the vibration dust removal unit 63 increases the frequency of vibration of the first side region 141a of the substrate 141, further disrupting the interfacial bonding force between the target particles and the electrode 14, making the target particles in the first side region 141a easier to loosen and easier to be vibrated off.

[0154] Therefore, the detection unit 67 can detect the proportion of target particles to the total number of collected particles within a preset time period, and adjust the working state of the action unit 61 and / or the vibration dust removal unit 63 to improve the particle removal efficiency.

[0155] Optionally, please combine Figure 4 The detection unit 67 can be located inside the collection box 655 of the negative pressure unit 65.

[0156] According to some embodiments of this application, optionally, please refer to... Figures 5 to 7 The cleaning device 60 includes a transmission unit 69 for transmitting the electrode 14.

[0157] Specifically, the transmission unit 69 of the cleaning device 60 can transmit the electrode sheet 14 through methods including but not limited to belt conveyor, flat-top chain conveyor, and roller conveyor, so that the electrode sheet 14 can pass through the action unit 61, the vibration dust removal unit 63, and the negative pressure unit 65 in sequence, thereby achieving the cleaning of the electrode sheet 14 by the cleaning device 60. The transmission unit 69 continuously optimizes the dispersed cleaning process (action loosening, vibration dust removal, and negative pressure collection), thereby improving the cleaning efficiency to a certain extent.

[0158] Therefore, the cleaning device 60 includes a transmission unit 69 for transmitting the electrode 14, which can optimize the cleaning process of the first side region 141a of the substrate 141 of the electrode 14 and improve the cleaning efficiency to a certain extent.

[0159] According to some embodiments of this application, optionally, please refer to... Figures 5 to 7 The transmission unit 69 includes a first pair of roller transmission mechanism 692 and a second pair of roller transmission mechanism 694. In the transmission direction of the electrode sheet 14, the roller transmission mechanism 692 is located downstream of the vibration dust removal unit 63, and the second pair of roller transmission mechanism 694 is located upstream of the action unit 61. The action unit 61 is located upstream of the vibration dust removal unit 63.

[0160] Specifically, in the transmission direction of the electrode 14, the first pair of rollers transmission mechanism 692 is located downstream of the vibration dust removal unit 63, and the second pair of rollers transmission mechanism 694 is located upstream of the action unit 61. The action unit 61 is located upstream of the vibration dust removal unit 63 (in... Figure 4 In this process, the electrode 14 is transported from left to right. The roller conveying mechanism 692 is located to the right of the vibration dust removal unit 63, and the second roller conveying mechanism 694 is located to the left of the action unit 61 (which is located to the left of the vibration dust removal unit 63). Thus, during the transport of the electrode 14, the second roller conveying mechanism 684 clamps and transports the first side area 141a of the electrode 14 substrate 141. After passing through the action unit 61, the vibration dust removal unit 63, and the negative pressure unit 65 for cleaning, the first roller conveying mechanism 692 clamps and transports the cleaned electrode 14, which to a certain extent stabilizes the transport of the electrode 14 and prepares it for the subsequent manufacturing process of the battery cell 10.

[0161] Both the first pair of rollers conveying mechanism 692 and the second pair of rollers conveying mechanism 694 include two conveying rollers. Taking the first pair of rollers conveying mechanism 692 as an example, please refer to... Figures 5 to 7The first pair of rollers conveying mechanism 692 includes a first conveying roller 692a and a second conveying roller 692b, which are respectively disposed on the upper and lower sides of the base 141 of the electrode 14 for clamping and conveying the electrode 14. In some embodiments, one of the first conveying roller 692a and the second conveying roller 692b is an active conveying roller and the other is a passive conveying roller. The active conveying roller is directly driven by a motor (including but not limited to a servo motor and a stepper motor) and can move the electrode 14 through rotational motion. The passive conveying roller is driven to rotate passively by friction with the electrode 14 or the active conveying roller.

[0162] In one embodiment, the first transfer roller 692a is the driving transfer roller, and the second transfer roller 692b is the driven transfer roller. In another embodiment, the second transfer roller 692b is the driving transfer roller, and the first transfer roller 692a is the driven transfer roller.

[0163] It is understood that the gap between the first pair of rollers in the transmission mechanism 692, i.e. the gap between the first transmission roller 692a and the second transmission roller 692b, is adjustable in order to avoid stress concentration and damage to the electrode 14 due to uneven gap between the rollers. The gap between the rollers can be specifically limited according to the thickness of the electrode 14, but this application does not make a specific limitation in this regard.

[0164] Thus, in the transmission direction of the electrode 14, the first pair of rollers transmission mechanism 692 is located downstream of the vibration dust removal unit 63, and the second pair of rollers transmission mechanism 694 is located upstream of the action unit 61. The action unit 61 is located upstream of the vibration dust removal unit 63. The second pair of rollers transmission mechanism 694 and the first pair of rollers transmission mechanism 692 can clamp and transmit the electrode 14 after cleaning, in preparation for the subsequent process of manufacturing the battery cell 10.

[0165] Secondly, please combine Figure 4 This application provides a production line 2000 for battery cell 10, which includes a cleaning device 60 according to any of the above embodiments.

[0166] Specifically, the cleaning device 60 can be used in the production line 2000 for battery cells 10, which can be used to produce battery cells 10 including but not limited to lithium batteries and sodium batteries. Optionally, the cleaning device 60 of this embodiment has high compatibility with battery cells 10 and can also be integrated into existing laser slitting / die-cutting equipment.

[0167] Please combine Figure 4The cleaning device 60 includes a transmission unit 69, which can transmit the electrode sheet 14 by means of, but not limited to, belt conveyor, flat-top chain conveyor, roller conveyor, etc., so that the electrode sheet 14 can pass through the laser cutting device 40, the action unit 61, the vibration dust removal unit 63 and the negative pressure unit 65 in sequence to complete the manufacturing and cleaning of the electrode sheet 14.

[0168] The production line 2000 for the battery cell 10 includes a laser cutting device 40, which is used for slitting and / or die-cutting the electrode sheet 14. The laser cutting device 40 uses high energy density to cut and shape the tab 143 of the electrode sheet 14. Slitting refers to using a laser beam to cut the continuous electrode sheet 14 material into thin sheets of uniform specifications according to a predetermined size. Die-cutting refers to punching the electrode sheet 14 into a specific shape using a mold.

[0169] Optionally, the transmission unit 69 causes the electrode 14 to pass through the action unit 61 at a speed of 40 to 80 m / min. The action unit 61 applies radial pressure and tangential friction to the first side region 141a of the substrate 141 of the electrode 14 to loosen the particles. Subsequently, under the transmission of the transmission unit 69, the electrode 14 passes through the vibration dust removal unit 63. The vibration dust removal unit 63 applies vibration to the first side region 141a after being processed by the action unit 61 to cause the particles to detach from the surface of the electrode 14. Then, the particles are collected by the negative pressure unit 65, thereby completing the cleaning of the laser-cut electrode 14.

[0170] In one example, through testing, the cleaning device 60 of this application embodiment can achieve a removal rate of more than or equal to 95% for the residual particles on the electrode 14 after laser cutting, and the ceramic coating peeling rate of the electrode 14 is controlled within 0.05%, and the surface roughness change rate is less than 2%, which can effectively avoid the internal self-discharge failure of the battery cell caused by the subsequent shedding of molten beads.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cleaning device for cleaning particulate matter from a pole piece, characterized by, The cleaning device includes: The actuation unit includes a first actuation roller and a second actuation roller. In the vertical direction, the first actuation roller and the second actuation roller are used to clamp the first side area of ​​the electrode substrate, thereby applying radial pressure and tangential friction to the first side area to loosen the particles. An electrode tab is connected to the side of the first side area. A vibration dust removal unit is used to apply vibration to the first side area after it has been processed by the action unit, so that the particles are removed from the surface of the electrode.

2. The cleaning device of claim 1, wherein, The actuation unit is also used to adjust the distance between the first actuation roller and the second actuation roller, thereby adjusting the pressure applied by the first actuation roller and the second actuation roller to the first side region of the substrate.

3. The cleaning device of claim 2, wherein, The distance between the first actuating roller and the second actuating roller is 50% to 70% of the thickness of the substrate and is greater than the depth to which the particles are embedded in the substrate.

4. The cleaning device of claim 2, wherein, At least one of the first and second actuating rollers has an elastic layer on its circumferential side.

5. The cleaning device of claim 2, wherein, The actuation unit includes a pressure sensor for detecting the pressure applied by the first actuation roller and the second actuation roller to the first side region of the substrate.

6. The cleaning device according to any one of claims 1 to 5, characterized in that The pressure applied by the first and second actuating rollers to the first side region of the substrate is 5 to 50 N / cm².

7. The cleaning device according to any one of claims 1 to 5, characterized in that The vibration dust removal unit includes an ultrasonic generator, which is used to apply ultrasonic waves to the first side area after it has been processed by the action unit, thereby applying vibration to the first side area after it has been processed by the action unit.

8. The cleaning device of claim 7, wherein, The ultrasonic generator produces ultrasonic waves with a frequency of 80 to 150 Hz and an amplitude of 0.2 to 0.4 mm.

9. The cleaning device of claim 7, wherein, The coverage area of ​​the ultrasonic wave is from the first side region of the substrate to the root region of the electrode, and the root region of the electrode is the area 5 to 10 mm away from the connection between the electrode and the substrate in the direction close to the free end of the electrode.

10. The cleaning device according to any one of claims 1 to 5, characterized in that The cleaning device includes a negative pressure unit for collecting the particulate matter.

11. The cleaning device of claim 10, wherein, The negative pressure unit includes a dust suction port located below the base, and the vibration dust removal unit is located above the base.

12. The cleaning device according to claim 11, characterized in that, The dust suction port and the vibration dust removal unit are arranged correspondingly in the vertical direction.

13. The cleaning device of claim 11 or 12, wherein, The negative pressure unit includes a pipe and a vent plate. One end of the pipe is provided with a dust suction port, and the vent plate closes the dust suction port. The vent plate is provided with a plurality of through holes that communicate with the inside of the pipe, and the diameter of the through holes is larger than the particle size of the particulate matter.

14. The cleaning device of claim 11, wherein, The negative pressure unit generates an airflow velocity ≥15m / s at the dust suction port.

15. The cleaning device of claim 10, wherein, The cleaning device includes a detection unit for detecting target particles in the particles collected by the negative pressure unit. If the particle size of the target particles is greater than a set value, and the proportion of the target particles to the total number of collected particles is greater than a set proportion within a preset time period, the action unit is used to increase the pressure applied to the first side area of ​​the substrate, and / or the vibration dust removal unit is used to increase the frequency of vibration on the first side area of ​​the substrate.

16. The cleaning device of any one of claims 1 to 5, wherein, The cleaning device includes a transmission unit for transmitting the electrode sheet.

17. The cleaning device of claim 16, wherein, The transmission unit includes a first pair of roller transmission mechanisms and a second pair of roller transmission mechanisms. In the transmission direction of the electrode sheet, the first pair of roller transmission mechanisms are located downstream of the vibration dust removal unit, and the second pair of roller transmission mechanisms are located upstream of the action unit. The action unit is located upstream of the vibration dust removal unit.

18. A production line of battery cells, characterized by, Includes the cleaning device as described in any one of claims 1-17.

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