A double-sided coating device for battery pieces

Abstract

This utility model discloses a double-sided coating equipment for battery cells, relating to the field of battery manufacturing technology. It includes a main body, a vacuum reaction chamber disposed inside the main body, and a conveying mechanism for transporting battery cells. The equipment is characterized by having at least one cleaning nozzle at both the top and bottom of the inner wall of the vacuum reaction chamber. Each cleaning nozzle is a rotatable vortex nozzle with its jet direction facing the inner wall surface of the vacuum reaction chamber. The cleaning nozzle is connected to an external gas source via a gas pipeline penetrating the wall of the vacuum reaction chamber. This application achieves efficient and automated cleaning of the inner wall of the vacuum reaction chamber through the combination of rotatable vortex nozzles at the top and bottom of the vacuum reaction chamber with a pulse control valve, and a dust removal device connected to the dust outlet at the bottom of the chamber. This effectively removes deposited dust and promptly removes any raised dust to prevent secondary pollution, thereby significantly improving the coating quality and yield of the battery cells.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a double-sided coating equipment for battery cells. Background Technology

[0002] In the photovoltaic industry, the production of solar cells typically requires double-sided coating in a vacuum environment using processes such as physical vapor deposition (PVD) or chemical vapor deposition (CVD) to form functional thin films such as anti-reflection films and passivation films, thereby improving the photoelectric conversion efficiency of the solar cells. In this process, the vacuum reaction chamber is the core component for completing the coating process. During the transport and processing of solar cells, small amounts of dust, particulate matter, or residues from previous processes are generated. These contaminants gradually accumulate on the inner walls of the vacuum reaction chamber, fixtures, and conveying mechanisms. In subsequent processes, due to the influence of plasma, airflow, or temperature changes within the chamber, these accumulated contaminants may detach and fall onto the surface of the solar cells, leading to defects such as film contamination, pinholes, uneven thickness, or even incomplete coating during the coating process. This severely affects the appearance, performance, and yield of the solar cells. Currently, the cleaning and maintenance of the vacuum coating equipment chamber mainly relies on two methods: The first is periodic manual cleaning during shutdown, where operators open the equipment and manually wipe the inner walls of the chamber using lint-free cloths, alcohol, and other tools. This method is not only time-consuming and inefficient, increasing equipment downtime and reducing production efficiency, but manual operation inevitably introduces new sources of contamination such as human skin flakes and cotton fibers, making it difficult to guarantee the cleaning effect and posing a significant quality risk. The second method is simple online purging, which involves setting fixed air vents in the equipment to introduce gas and purge the inner walls. Although this method achieves non-stop cleaning, the airflow pattern is singular and the impact force is weak. It can often only remove surface dust and is not effective at cleaning tightly attached stubborn particles. Moreover, the dust raised can easily spread in the chamber, causing secondary pollution, and cannot fundamentally solve the problem. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a double-sided coating equipment for battery cells, which solves the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a double-sided coating equipment for battery cells, comprising a main body, a vacuum reaction chamber disposed inside the main body, and a conveying mechanism for transporting battery cells, characterized in that: at least one cleaning nozzle is provided at the top and bottom of the inner wall of the vacuum reaction chamber, the cleaning nozzle being a rotatable vortex nozzle with the jet direction facing the inner wall surface of the vacuum reaction chamber; the cleaning nozzle is connected to an external gas source through a gas pipeline penetrating the wall of the vacuum reaction chamber, the gas pipeline being provided with a pulse control valve; a dust discharge port is provided on the bottom wall of the vacuum reaction chamber, the dust discharge port being connected to a dust removal device.

[0005] As a further technical solution of this utility model, the dust removal device includes a dust collection tank, a filter and a vacuum pump connected in sequence, and the suction end of the vacuum pump is connected to the dust discharge port.

[0006] As a further technical solution of this utility model, the inner wall of the vacuum reaction chamber is a smooth mirror structure.

[0007] As a further technical solution of this utility model, the conveying mechanism is a detachable hollow conveyor belt.

[0008] As a further technical solution of this utility model, the dust discharge port is located at the bottom center of the vacuum reaction chamber.

[0009] As a further technical solution of this utility model, the gas provided by the external gas source is an inert gas or dry clean air.

[0010] As a further technical solution of this utility model, a control unit is electrically connected to one side of the main body of the equipment, and the control unit is electrically connected to the pulse control valve and the dust removal device.

[0011] This utility model provides a double-sided coating equipment for battery cells, which has the following advantages compared with the prior art: 1. This design provides a double-sided coating equipment for solar cells. By combining rotatable vortex nozzles and pulse control valves at the top and bottom of the vacuum reaction chamber, and connecting a dust removal device to the dust outlet at the bottom of the chamber, this design significantly improves the coating quality and yield of solar cells compared to existing technologies. 2. This design provides a double-sided coating equipment for battery cells, which uses a pulse control valve to control a vortex nozzle to generate intermittent strong airflow, and a dust removal system consisting of a dust collection tank, a filter, and a vacuum pump. Compared with existing technologies, it has the advantages of high cleaning energy, the ability to shake off stubborn particles, high dust removal efficiency, and the ability to collect dust particles, protect the vacuum pump, and extend the service life of the equipment. 3. The double-sided coating equipment for battery cells designed in this paper adopts a smooth mirror-like inner wall and a detachable hollow conveyor belt. Compared with the existing technology, it has the advantages of easy cleaning and easy dust accumulation on the inner wall, and the conveyor mechanism itself is easy to disassemble, clean or replace, which greatly reduces the difficulty of equipment maintenance and downtime. 4. The double-sided coating equipment for battery cells designed in this paper controls the start and stop sequence of the pulse control valve and the dust removal device through the control unit, and uses inert gas or dry clean air as the gas source. Compared with the existing technology, it can realize intelligent and programmed automatic cleaning process, ensuring thorough cleaning and energy saving, while avoiding the introduction of new pollution or reaction with process gas by the cleaning medium, thus ensuring the safety and stability of the coating process. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional elevation view of a double-sided coating equipment for battery cells. Figure 2 A schematic diagram of a dust removal device in a double-sided coating equipment for battery cells; Figure 3 This is a schematic diagram of the overall back elevation structure of a double-sided coating equipment for battery cells.

[0013] In the diagram: 1. Main body of the equipment; 2. Vacuum reaction chamber; 3. Conveying mechanism; 4. Cleaning nozzle; 5. Gas pipeline; 6. External air source; 7. Dust outlet; 8. Dust removal device; 81. Dust collection tank; 82. Filter; 83. Vacuum pump; 9. Pulse control valve. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3 This utility model provides a technical solution for a double-sided coating equipment for battery cells: like Figure 1 and Figure 3As shown, the device includes a main body 1, a vacuum reaction chamber 2 disposed inside the main body 1, and a conveying mechanism 3 for transferring battery cells. The device is characterized in that: at least one cleaning nozzle 4 is provided at both the top and bottom of the inner wall of the vacuum reaction chamber 2; the cleaning nozzle 4 is a rotatable vortex nozzle with the air jet direction facing the inner wall surface of the vacuum reaction chamber 2; the cleaning nozzle 4 is connected to an external gas source 6 through a gas pipe 5 penetrating the wall of the vacuum reaction chamber 2, and a pulse control valve 9 is provided on the gas pipe 5; a dust discharge port 7 is provided on the bottom wall of the vacuum reaction chamber 2. It is connected to a dust removal device 8; when cleaning is required, the gas from the external air source 6 is modulated into a pulse airflow through the pulse control valve 9 and sprayed onto the inner wall of the chamber through the cleaning nozzle 4, shaking off and peeling off the dust; at the same time, the dust removal device 8 is activated, generating suction at the dust outlet 7, instantly sucking away the raised dust, realizing the simultaneous blowing and collection, which can efficiently and automatically clean the vacuum reaction chamber 2 without disassembling the equipment, and effectively prevent secondary contamination of the chamber and workpiece by dust during the cleaning process, fundamentally ensuring the high cleanliness of the coating process environment.

[0016] like Figure 2 As shown, the dust removal device 8 includes a dust collection tank 81, a filter 82, and a vacuum pump 83 connected in sequence. The suction end of the vacuum pump 83 is connected to the dust discharge port 7. The vacuum pump 83 generates suction force, drawing the dust-laden airflow from the dust discharge port 7 into the dust collection tank 81. Large dust particles settle into the tank first due to the reduced flow velocity and gravity. Subsequently, the airflow carrying fine dust passes through the filter 82, where the dust is trapped. The clean gas is finally discharged by the vacuum pump 83, achieving multi-stage efficient collection and treatment of dust. The dust collection tank 81 collects large particles, preventing pipe blockage. The filter 82 ensures the cleanliness of the discharged gas and protects the vacuum pump 83 from wear, significantly extending the service life and maintenance cycle of the entire dust removal system.

[0017] like Figure 1 As shown, the inner wall of the vacuum reaction chamber 2 is a smooth mirror structure. This mirror structure physically provides extremely low surface roughness. When the pulsed airflow impacts the inner wall, the contact area and adhesion between dust particles and the wall surface are greatly reduced, making them easier to be peeled off by the airflow. This not only reduces the amount of dust accumulated on the wall surface, but also greatly improves the cleaning efficiency. Even stubborn particles are easier to remove. At the same time, the surface itself does not easily generate dust, reducing the generation of pollutants from the source.

[0018] like Figure 1As shown, the conveying mechanism 3 is a detachable perforated conveyor belt; its perforated structure allows the clean airflow to pass through unimpeded, thoroughly cleaning the conveyor belt itself and the bottom of the chamber, avoiding the formation of cleaning dead corners; its detachable connection design allows operators to periodically remove it from the equipment for individual cleaning or direct replacement, completely solving the problem that traditional conveying devices themselves become sources of dust accumulation and hinder cleaning, greatly improving the thoroughness of cleaning, while making maintenance operations simple and quick, and significantly reducing equipment downtime.

[0019] like Figure 1 As shown, the dust exhaust port 7 is located at the bottom center of the vacuum reaction chamber 2. Utilizing gravity, all dust particles that have been separated by the airflow will naturally settle and collect at the bottom of the chamber after being lifted up. The dust exhaust port 7, located at the lowest point, can most effectively cover the entire bottom area and efficiently suck out the collected dust, ensuring maximum dust suction efficiency and no dead corners. This achieves thorough removal of dust from the chamber, which is the key structural guarantee for achieving efficient cleaning without secondary pollution.

[0020] like Figure 1 and Figure 3 As shown, the gas provided by the external air source 6 is either inert gas or dry clean air. During online purging and cleaning, these gases are directly injected into the high-value vacuum reaction chamber 2, completely avoiding new contaminants such as oil and moisture that may be introduced by using ordinary compressed air, thus ensuring the cleanliness of the cleaning medium itself. At the same time, the use of inert gas can also avoid unnecessary chemical reactions with residual process gases or the film layer that is forming in the chamber, absolutely ensuring the safety of the coating process and the stability of product quality.

[0021] like Figure 2 and Figure 3 As shown, a control unit is electrically connected to one side of the main body 1 of the equipment. The control unit is electrically connected to the pulse control valve 9 and the dust removal device 8. By writing a control program, the control unit can precisely control the start-stop sequence and working time of the vacuum pump 83 and the pulse control valve 9. For example, a command can be issued to start the vacuum pump 83 first, and then delay the opening of the pulse control valve 9; after cleaning, the pulse control valve 9 can be closed first, and then the vacuum pump 83 can be closed with a delay. This achieves fully automated and intelligent operation of the entire cleaning process, ensuring the key timing of "establishing negative pressure first, and then starting the blowing", optimizing the cleaning effect, avoiding the uncertainty and errors caused by human operation, and ensuring the consistency and reliability of equipment operation.

[0022] The working principle of this utility model is as follows: First, in the start-up and preparation stage, when the equipment needs to perform a cleaning procedure, the control unit issues a command to start the vacuum pump 83 in the dust removal device 8, so that the entire dust removal system starts working and generates a stable negative pressure suction force at the dust discharge port 7, preparing for subsequent dust collection; Second, in the high-pressure blowing and dust removal stage, after confirming that the dust removal system is operating normally, the control unit opens the pulse control valve 9 according to the preset program. The inert gas or dry clean air provided by the external air source 6, under the modulation of the pulse control valve 9, forms an intermittent high-pressure pulse airflow, which is delivered to the rotatable vortex nozzle 4 through the gas pipeline 5. The vortex nozzle 4 rotates under the drive of the high-speed airflow, transforming the pulse airflow into a rotating vortex with a wide coverage and strong impact force, which evenly and intensely impacts the inner wall surface of the top and bottom of the vacuum reaction chamber 2. This pulsed powerful blowing can effectively loosen and peel off stubborn deposited particles attached to the inner wall; Then, in the dust collection and discharge stage... Dust stripped by the high-pressure airflow is stirred up in the chamber. Due to the continuous suction provided by the vacuum pump 83, the stirred-up dust mixes with the airflow and is quickly sucked out through the dust outlet 7 located at the lowest point of the chamber. The airflow containing dust first enters the dust collection tank 81, where most particles settle due to gravity and volume expansion. Subsequently, the fine dust is further filtered by the filter 82, and finally, the clean gas is discharged by the vacuum pump 83. This process ensures that the dust is effectively collected and prevents secondary pollution during the cleaning process. Finally, the auxiliary structure works synergistically. Throughout the cleaning process, the smooth mirror-like inner wall of the vacuum reaction chamber 2 greatly reduces the adhesion of dust, making it easier for particles to be stripped by the airflow. At the same time, the detachable hollow conveyor belt design prevents it from becoming a dust accumulation point and does not hinder the airflow from thoroughly cleaning the bottom of the chamber. It is also easy to remove for separate cleaning, eliminating the source of pollution.

[0023] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A double-sided coating equipment for battery cells, characterized in that, The device includes a main body (1), a vacuum reaction chamber (2) disposed inside the main body (1), and a conveying mechanism (3) for conveying battery cells. The device is characterized in that: at least one cleaning nozzle (4) is provided at the top and bottom of the inner wall of the vacuum reaction chamber (2). The cleaning nozzle (4) is a rotatable vortex nozzle with the jet direction facing the inner wall surface of the vacuum reaction chamber (2). The cleaning nozzle (4) is connected to an external gas source (6) through a gas pipeline (5) penetrating the wall of the vacuum reaction chamber (2). A pulse control valve (9) is provided on the gas pipeline (5). A dust discharge port (7) is provided on the bottom wall of the vacuum reaction chamber (2). The dust discharge port (7) is connected to a dust removal device (8).

2. The double-sided coating equipment for battery cells according to claim 1, characterized in that, The dust removal device (8) includes a dust collection tank (81), a filter (82) and a vacuum pump (83) connected in sequence, with the suction end of the vacuum pump (83) connected to the dust discharge port (7).

3. The double-sided coating equipment for battery cells according to claim 1, characterized in that, The inner wall of the vacuum reaction chamber (2) is a smooth mirror structure.

4. The double-sided coating equipment for battery cells according to claim 1, characterized in that, The conveying mechanism (3) is a detachable hollow conveyor belt.

5. The double-sided coating equipment for battery cells according to claim 1, characterized in that, The dust outlet (7) is located at the bottom center of the vacuum reaction chamber (2).

6. The double-sided coating equipment for battery cells according to claim 1, characterized in that, The gas provided by the external gas source (6) is an inert gas or dry clean air.

7. The double-sided coating equipment for battery cells according to claim 1, characterized in that, A control unit is electrically connected to one side of the main body (1) of the equipment, and the control unit is electrically connected to the pulse control valve (9) and the dust removal device (8).

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