Battery pole piece flying cleaning device

Abstract

The application relates to a battery pole piece flying cleaning device, which comprises a laser, an AOD optical module, a driving mechanism and a focusing assembly. The AOD optical module is used for modulating a laser beam output by the laser into multiple light beams. The driving mechanism has two conveying parts arranged at intervals, and the head and tail ends of a battery pole piece to be cleaned are arranged on the two conveying parts respectively. The two conveying parts provide linear driving forces in the same direction. The focusing assembly is used for focusing the multiple light beams output by the AOD optical module into multiple focused light spots, and each focused light spot is arranged in a square matrix. Each focused light spot output by the focusing assembly is shot at an interval area between the two conveying parts, and each focused light spot is shot on one surface of the battery pole piece to be cleaned. The application realizes the double-surface simultaneous cleaning of the battery pole piece, and the overall efficiency is maximally improved by about 2-3 times compared with the prior art, which is a revolutionary improvement for the battery pole piece cleaning industry.

Description

Technical Field

[0001] This invention relates to the field of battery electrode cleaning technology, specifically to a battery electrode airborne cleaning device. Background Technology

[0002] Lithium-ion batteries possess advantages such as long cycle life, fast charging, high voltage, high specific energy, and good safety performance, making them widely used in automobiles, energy storage, and smart 3C products. The graphite coating on the negative electrode plays an indispensable role in suppressing battery thermal effects, reducing internal resistance, lowering manufacturing costs, and improving battery life. In current lithium-ion battery manufacturing processes, laser cleaning is used to clean the coating on the surface of the lithium-ion battery electrodes, creating grooves at designated locations to prepare for subsequent tab welding.

[0003] Currently, there are two methods for cleaning battery electrode sheets. One method involves the battery electrode strip being pulled by a transmission mechanism to a laser processing station. In a stationary state, it is adsorbed and fixed by a vacuum adsorption platform, and then the laser processes side A. After laser processing, the strip is pulled to another laser station for side B processing; sides A and B are opposite sides. The other method is a dynamic processing method where the strip is continuously pulled at a constant speed. As it passes the side A station, it is processed accordingly. When the strip exceeds the processing range of side A, side A processing is completed. Then, when it passes the side B processing area, the same process is performed to complete side B processing. The first method, static processing, requires frequent equipment start-ups and stops, affecting overall processing efficiency. The dynamic processing method, while eliminating the need for start-ups and stops, still requires processing both sides A and B. Summary of the Invention

[0004] The purpose of this invention is to provide a battery electrode airborne cleaning device, which can at least solve some of the defects in the prior art.

[0005] To achieve the above objectives, embodiments of the present invention provide the following technical solution: a battery electrode flying cleaning device, comprising a laser, an AOD optical module, a driving mechanism, and a focusing component.

[0006] The AOD optical module is used to modulate a single laser beam output from the laser into multiple beams.

[0007] The drive mechanism has two transport sections spaced apart. The two ends of the battery electrode to be cleaned are respectively mounted on the two transport sections, and the two transport sections provide a linear driving force in the same direction.

[0008] The focusing component is used to focus the multiple beams of light output from the AOD optical module into multiple focused light spots, and the focused light spots are arranged in a square array.

[0009] Each focused light spot output by the focusing component is projected onto the interval between the two transport sections, and each focused light spot is projected onto one of the surfaces of the battery electrode to be cleaned.

[0010] Furthermore, the AOD optical module modulates one beam of light into four beams, and the four focused light spots form a square array.

[0011] Furthermore, the focusing component includes a galvanometer and a field lens, and the multiple beams of light output by the AOD optical module pass through the galvanometer and the field lens in sequence to output multiple focused light spots.

[0012] Furthermore, the size of the focused spot is 80~100μm.

[0013] Furthermore, along the driving direction of the driving mechanism, the center-to-center distance between two adjacent focused light spots is 60~80μm.

[0014] Furthermore, it also includes a heating assembly for preheating the surface of the battery electrodes to be cleaned.

[0015] Furthermore, the heating component includes a heating light output device, which outputs a heating light beam that is directed onto the upper surface of the electrode sheet to be cleaned, and the heating temperature is controlled at 50~100°.

[0016] Furthermore, it also includes a cooling assembly for cooling the battery electrodes to be cleaned.

[0017] Furthermore, the cooling assembly includes a cooling housing that can be filled with cooling gas, and the cooling housing has an opening on the side facing the lower surface of the battery electrode.

[0018] Furthermore, the conveying section includes a conveying roller and a pressure roller, and the battery electrode sheets to be cleaned are held and conveyed by the pressure roller and the conveying roller.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: A battery electrode cleaning device in flight splits a laser beam into multiple laser beams through an AOD optical module, and then focuses the multiple laser beams into multiple focused light spots arranged in a square array through a focusing component. The multiple focused light spots irradiate the battery electrode to be cleaned. Since the battery electrode to be cleaned has no support, when the multiple focused light spots hit one side, the material on that side peels off and the heat is conducted to the other side through the foil. That is, while processing one side of the battery electrode to be cleaned, it vibrates the other side, causing the coating on that side to be vibrated off. Thus, the battery electrode can be cleaned on both sides at the same time. The overall efficiency is about 2 to 3 times higher than that of the prior art, which is a revolutionary improvement for the battery electrode cleaning industry. Attached Figure Description

[0020] Figure 1This is a three-dimensional structural diagram of a battery electrode aerial cleaning device provided in an embodiment of the present invention;

[0021] Figure 2 This is a top view of a battery electrode air-to-air cleaning device provided in an embodiment of the present invention.

[0022] Figure 3 A schematic diagram of the array of light spots formed by a battery electrode flying cleaning device provided in an embodiment of the present invention;

[0023] In the attached diagram, the following labels are used: 1-Laser; 2-AOD optical module; 3-Galvanometer; 4-Field lens; 5-Focused spot; 6-Battery electrode to be cleaned; 7-Heating light output device; 8-Cooling housing; 9-Conveyor roller; 10-Pressure roller; 11-Heating beam. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1 and Figure 2This invention provides a battery electrode in-flight cleaning device, including a laser 1, an AOD optical module 2, a driving mechanism, and a focusing component. The AOD optical module 2 is used to modulate a single laser beam output by the laser 1 into multiple beams. The driving mechanism has two transport sections spaced apart, with the first and last ends of the battery electrode 6 to be cleaned respectively disposed on the two transport sections. The two transport sections provide linear driving force in the same direction. The focusing component is used to focus the multiple beams of light output by the AOD optical module 2 into multiple focused light spots 5, and each focused light spot 5 is arranged in a square array. Each focused light spot 5 output by the focusing component is projected onto the interval between the two transport sections, and each focused light spot 5 is projected onto one surface of the battery electrode 6 to be cleaned. In this embodiment, an AOD optical module 2 splits a laser beam into multiple laser beams, which are then focused into multiple focused light spots 5 arranged in a square array by a focusing component. These focused light spots 5 irradiate the battery electrode sheet 6 to be cleaned. Since the battery electrode sheet 6 has no support, when the multiple focused light spots 5 hit one side, the material on that side peels off, and heat is conducted to the other side through the foil. That is, while processing one side of the battery electrode sheet 6, the other side is vibrated, causing the coating on that side to be vibrated and peel off. This achieves simultaneous cleaning of both sides of the battery electrode sheet, with an overall efficiency improvement of approximately 2 to 3 times compared to existing technologies, representing a revolutionary improvement for the battery electrode sheet cleaning industry. Specifically, the AOD optical module 2 performs diffraction modulation to form spatially distributed laser beams, such as those arranged in a square array, which are then focused into focused light spots 5 by the focusing component. The size of each focused light spot 5 is 80 to 100 μm. When the battery electrode 6 to be cleaned is transported by a conveyor unit, since two conveyor units are used to transport the battery electrode 6, the battery electrode 6 is without a bottom support. When one side receives the impact of multiple focused light spots 5, the bottomless structure can avoid restricting the vibration of the battery electrode, thereby ensuring that the other side of the battery electrode 6 can effectively vibrate and shake off the coating. Compared with traditional cleaning, this embodiment can clean both sides of the battery electrode simultaneously, and the use of a single laser 1 can achieve effective energy impact, which also reduces the cost of the device. The AOD optical module 2 uses the principle of Bragg diffraction to split the laser beam into multiple beams and distribute them in a spatial sequence. Preferably, the laser 1 can be a 1000W nanosecond laser 1. After the light spot is diffracted and homogenized, a composite light spot with a uniform light field is formed. Compared with a single laser, the light field of multiple spots increases the laser's effective area and can improve scanning efficiency.

[0026] Please see Figure 1 , Figure 2 and Figure 3The AOD optical module 2 modulates one beam of light into four beams, and the four focused light spots 5 form a square array. In this embodiment, as... Figure 3 As shown, the final light spots form a square array, and the diameter of the circle formed by the convergence of four light spots is 140~180μm. Additionally, as... Figure 3 As shown, during the linear scanning process, for example along the conveying direction of the battery electrode 6 to be cleaned, the center distance between the front and rear focused light spots 5 is 60~80μm. When the front and rear focused light spots 5 pass through the same point, a time lag can be formed. Through this time difference, low power is continuously applied to the material surface to prevent the material from being damaged due to excessive power during the processing.

[0027] Please see Figure 1 and Figure 2 The focusing assembly includes a galvanometer 3 and a field lens 4. The multiple beams of light output from the AOD optical module 2 pass sequentially through the galvanometer 3 and the field lens 4 to output multiple focused light spots 5. In this embodiment, the multiple beams of light modulated by the AOD optical module 2 are then formed into a square array by the optical system of the galvanometer 3 and the field lens 4. The size of a single focused light spot 5 is 80~100μm. Combined with the center-to-center distance of 60~80μm between two adjacent focused light spots 5, and the diameter of the circle formed by the convergence of four light spots being 140~180μm, the focusing uniformity of the light spots can be improved.

[0028] Please see Figure 1 and Figure 2 The device also includes a heating component for preheating the surface of the battery electrode 6 to be cleaned. In this embodiment, the surface of the battery electrode 6 to be cleaned can be preheated by irradiation with a surface light source. The temperature of the electrode surface is controlled at 50-100°C. At this temperature, the surface activity of the electrode is not affected, but the material absorption entropy value is enhanced. Through experimental verification and comparison, the surface temperature rise of the material during laser heating is more conducive to the thermal diffusion of the material. Specifically, during the movement of the electrode, heating is performed in the first 20-50 mm of the cleaning tank, and heating is performed in a 50*50 mm width area. When the temperature rises rapidly to 50-100°C, the electrode is within the cleaning area, and cleaning is performed at this time, which improves the laser absorption rate of the upper surface material. Preferably, the heating component includes a heating light output device 7, and the heating light beam 11 output by the heating light output device 7 is directed onto the upper surface of the electrode to be cleaned. Here, the heating light output device 7 can be a laser, which heats the electrode by laser.

[0029] Please see Figure 1 and Figure 2The device also includes a cooling component for cooling the battery electrode 6 to be cleaned. In this embodiment, the cooling component operates in the opposite position to the heating component. For example, the heating component heats the upper surface of the battery electrode to be cleaned, while the cooling component cools the lower surface of the battery electrode to be cleaned. Specifically, the upper surface of the battery electrode to be cleaned is heated by high-energy laser input. When the lower surface of the electrode is cooled, the stress distribution inside the electrode changes. At this time, when the upper surface of the electrode receives a large amount of high-peak short-pulse laser energy, that is, when the upper surface of the electrode receives the energy impact of four focused laser spots 5, heat is conducted to the bottom through the intermediate foil layer, thereby increasing the stress diffusion of the bottom substrate and achieving the purpose of rapid material detachment and peeling.

[0030] For further optimization of the above solution, please refer to [link / reference]. Figure 1 and Figure 2 The cooling assembly includes a cooling housing 8 that can be filled with cooling gas, and the cooling housing 8 has an opening on the side facing the lower surface of the battery electrode. In this embodiment, the structure of the cooling assembly can be refined, using a semi-sealed cooling housing 8. Specifically, the cooling housing 8 has an opening on the side facing the lower surface of the battery electrode. When cooling gas is introduced into the cooling housing 8, it will dissipate towards the lower surface of the battery electrode, thereby changing the temperature of the lower surface of the electrode. An air inlet and an air outlet are respectively opened on opposite sides of the cooling housing 8. The cooling gas used can be dry ice, which can maintain a relatively low temperature environment, such as 5~10°C, on the lower surface of the electrode. In addition, due to the shape characteristics of the cooling housing 8, it can also serve as a collector for collecting detached material, facilitating the subsequent centralized processing of the coating material peeled off the electrode. Preferably, an openable and closable partition is provided at the bottom of the cooling housing 8. When a large amount of coating material is collected, the partition opens, and the material is discharged from the cooling housing 8 into the collection bag, thus forming a more flexible collection mechanism. Moreover, it can save costs compared to traditional dust collectors for collecting coating material. The device uses a 2*2 array of light spots, with a galvanometer scanning fill gap of 0.2mm, a galvanometer scanning speed of 3-4wmm / s, a laser pulse width of 250-500ns, and a laser power of 80%-90%, performing 2-3 scans. The upper surface of the battery electrode to be cleaned is preheated to enhance absorption. The high-energy, peak-value focused laser beam impacts the material, causing the upper surface material of the battery electrode to peel off. Simultaneously, heat is conducted through the foil to the lower surface of the battery electrode. Under the combined effects of vibration, vaporization, and thermal changes, the negative electrode material on the lower surface of the battery electrode to be cleaned is peeled off. This achieves the goal of single-sided laser processing and double-sided negative electrode removal, improving overall processing efficiency by 2-3 times under the same working conditions.

[0031] Please see Figure 1 and Figure 2 The conveying unit includes a conveying roller 9 and a pressure roller 10. The battery electrode sheet 6 to be cleaned is clamped and conveyed by the pressure roller 10 and the conveying roller 9. In this embodiment, the conveying roller 9 can be used to provide linear driving force. After the battery electrode sheet 6 to be cleaned is placed on the conveying roller 9, the two conveying rollers 9 cooperate to convey the battery electrode sheet. The battery electrode sheet 6 to be cleaned is clamped and conveyed by the pressure roller 10 and the conveying roller 9, with the pressure roller 10 located above the conveying roller 9. Using the pressure roller 10, which cooperates with the conveying roller 9 to clamp and convey the battery electrode sheet, can reduce the fluctuation of the battery electrode sheet and improve the cleaning efficiency.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery electrode airborne cleaning device, comprising a laser, characterized in that: It also includes the AOD optical module, drive mechanism, and focusing components. The AOD optical module is used to modulate a single laser beam output from the laser into multiple beams. The drive mechanism has two transport sections spaced apart. The two ends of the battery electrode to be cleaned are respectively mounted on the two transport sections, and the two transport sections provide a linear driving force in the same direction. The focusing component is used to focus the multiple beams of light output from the AOD optical module into multiple focused light spots, and the focused light spots are arranged in a square array. Each focused light spot output by the focusing component is projected onto the interval between the two transport sections, and each focused light spot is projected onto one of the surfaces of the battery electrode to be cleaned.

2. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: The AOD optical module modulates one beam of light into four beams, and the four focused light spots form a square array.

3. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: The focusing component includes a galvanometer and a field lens. The multiple beams of light output by the AOD optical module pass through the galvanometer and the field lens in sequence to output multiple focused light spots.

4. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: The size of the focused spot is 80~100μm.

5. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: Along the driving direction of the driving mechanism, the center-to-center distance between two adjacent focused light spots is 60~80μm.

6. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: It also includes a heating assembly for preheating the surface of the battery electrodes to be cleaned.

7. The battery electrode air-to-air cleaning device as described in claim 6, characterized in that: The heating component includes a heating light output device, which outputs a heating light beam that is directed onto the upper surface of the electrode sheet to be cleaned, and the heating temperature is controlled between 50 and 100°C.

8. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: It also includes a cooling assembly for cooling the battery electrodes to be cleaned.

9. The battery electrode air-to-air cleaning device as described in claim 8, characterized in that: The cooling assembly includes a cooling housing that can be filled with cooling gas, and the cooling housing has an opening on the side facing the lower surface of the battery electrode.

10. The battery electrode air-to-air cleaning device as described in claim 1, characterized in that: The conveying section includes a conveying roller and a pressure roller, and the battery electrode sheets to be cleaned are held and conveyed by the pressure roller and the conveying roller.

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