Coating device for processing positive plate

Abstract

The utility model relates to the technical field of processing equipment, and discloses a coating device for processing a positive plate, which comprises a feeding component, a coating component and a coating component, the spraying assembly is connected with the feeding assembly and comprises at least two spray heads, and the spray heads are oppositely arranged and are provided with gaps allowing the positive plates to penetrate through; when the positive plate passes through the gap, at least one surface of the positive plate can be coated by the spray head; the heating assembly comprises a heating chamber and a heating element, a heating channel communicated with the outside is arranged in the heating chamber, and the heating element is arranged in the heating chamber and can heat the positive plate in the heating channel. The double-sided coating device has the advantages that the double-sided coating device has a heating function and can realize double-sided high-efficiency coating.

Description

Technical Field

[0001] This utility model relates to the field of processing equipment technology, and in particular to a coating device for processing positive electrode sheets. Background Technology

[0002] Primary lithium-manganese batteries are widely used in sensors, electronic tags, and small medical devices due to their advantages such as high capacity, low self-discharge rate, and long service life. The preparation of the positive electrode sheet is a crucial step in the manufacturing process of primary lithium-manganese batteries. Typically, the positive electrode consists of a conductive agent (such as graphite or carbon black), an active material (such as electrolytic manganese dioxide), and a binder. These materials are mixed to form semi-wet solid particles, which are then coated onto a stainless steel mesh and rolled to form a positive electrode sheet of standard thickness. However, positive electrode sheets prepared using traditional processes are prone to particle shedding (commonly known as "powdering") during subsequent processing and use due to insufficient bonding between the active material and the current collector. This structural defect leads to an abnormally high internal resistance and premature voltage decay, severely affecting the battery's discharge performance and cycle life.

[0003] To address this issue, existing technology discloses a polymer emulsion. After being applied to the surface of the positive electrode, this emulsion, when heated, forms a protective film on the surface, significantly reducing powder shedding from the positive electrode. However, in practical applications, it has been found that existing spraying equipment lacks heating functionality, and some equipment can only achieve single-sided spraying, failing to meet the requirement of uniform coating on both sides. Therefore, there is an urgent need to design a dedicated coating device capable of achieving uniform coating on both sides and possessing heating functionality to meet the specific needs of the primary lithium-manganese primary battery positive electrode preparation process. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a coating device for positive electrode processing that has a heating function and can achieve efficient double-sided coating.

[0005] The technical solution adopted by this utility model to solve its technical problem is a coating device for processing positive electrode sheets, comprising:

[0006] A feeding assembly for providing a coating medium;

[0007] A spraying assembly connected to the feeding assembly includes at least two nozzles arranged opposite each other and having a gap for the positive electrode sheet to pass through; when the positive electrode sheet passes through the gap, the nozzles can coat at least one surface of the positive electrode sheet.

[0008] A heating assembly includes a heating chamber and a heating element. The heating chamber has a heating channel communicating with the outside. The heating element is located in the heating chamber and can heat the positive electrode plate located in the heating channel.

[0009] In the above-mentioned coating apparatus for processing positive electrode sheets, the spraying assembly includes a spraying box having a receiving groove, and the nozzle is disposed in the receiving groove; when the nozzle coats the positive electrode sheet, the receiving groove can restrict the coating medium from splashing out.

[0010] In the above-mentioned coating apparatus for processing positive electrode sheets, the nozzle includes a first nozzle and a second nozzle, which are detachably disposed in the receiving groove and arranged in an upper and lower structure opposite to each other.

[0011] In the above-mentioned coating apparatus for processing positive electrode sheets, the receiving groove is further provided with a plurality of rotatable rollers, and the rollers can guide the positive electrode sheet into the gap.

[0012] In the above-mentioned coating apparatus for processing positive electrode sheets, the rollers include a first roller, a second roller, a third roller, and a fourth roller. The first roller and the second roller are respectively located on both sides of the opening of the receiving groove, and the third roller and the fourth roller are respectively located on both sides between the first nozzle and the second nozzle, and are on the same straight line as the gap.

[0013] In the above-mentioned coating apparatus for processing positive electrode sheets, the feeding assembly includes a material tank and a feeding drive structure. The material tank is used to store the coating medium, and the feeding drive structure is connected to the material tank and the nozzle respectively, and can drive the coating medium to flow to the nozzle.

[0014] In the above-mentioned coating apparatus for processing positive electrode sheets, the feeding drive structure is a hollow structure, which is provided with a first feeding connector, a second feeding connector and an air inlet connector. The first feeding connector is connected to the first nozzle, the second feeding connector is connected to the second nozzle, and the air inlet connector is connected to an air source. When the air inlet connector is connected to the air source, it can drive the coating medium to flow to the first nozzle and the second nozzle.

[0015] In the above-mentioned coating device for processing positive electrode sheets, a metering tank is also provided between the material tank and the feeding drive structure. One end of the metering tank is connected to the material tank through a first pipe, and the other end is connected to the feeding drive structure through a second pipe.

[0016] In the above-mentioned coating apparatus for processing positive electrode sheets, a first control valve is provided on the first pipe, a second control valve is provided on the second pipe, and a third pipe communicating with the outside is also provided on the first pipe, and an exhaust valve is provided on the third pipe.

[0017] In the above-mentioned coating apparatus for processing positive electrode sheets, the heating element is provided in two sets, arranged in an upper and lower structure, and clamps the heating channel.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. In this utility model, by setting up a feeding component, a spraying component, and a heating component, and making the spraying component include at least two nozzles, on the one hand, the integrated design of the coating and heating process is realized, ensuring that the coating medium is fully heated and cured to form a dense protective film, thereby significantly enhancing the coating adhesion and effectively reducing powder shedding; on the other hand, it can achieve simultaneous coating of both sides of the positive electrode sheet, greatly improving the coating efficiency.

[0020] 2. In this utility model, by setting up a spray box with a receiving groove and placing the spray head in the receiving groove, the coating medium can be prevented from splashing into the external environment, thereby reducing the pollution to the surrounding equipment and operating area and reducing the workload of cleaning and maintenance.

[0021] 3. In this utility model, by adding multiple rotatable rollers in the receiving groove, the positive electrode sheet can be guided to accurately enter the nozzle gap, avoiding deviation or jamming when the positive electrode sheet moves, and further improving the coating accuracy and stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the coating device for processing positive electrode sheets according to the present invention.

[0023] Figure 2 This is a schematic diagram of the feeding component in this utility model.

[0024] Figure 3 This is a cross-sectional view of the spraying component in this utility model.

[0025] Figure 4 This is a cross-sectional view of the heating component in this utility model.

[0026] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 100, feeding assembly; 110, material hopper; 120, feeding drive structure; 121, first feeding connector; 122, second feeding connector; 123, air inlet connector; 130, metering tank; 140, first pipe; 141, second pipe; 142, third pipe; 150, first control valve; 151, second control valve; 152, exhaust valve; 200, spraying assembly; 210, first nozzle; 211, second nozzle; 220, spraying box; 221, receiving tank; 230, roller; 231, first roller; 232, second roller; 233, third roller; 234, fourth roller; 300, heating assembly; 310, heating box; 311, heating chamber; 320, heating element; 330, heating channel; 400, positive electrode sheet. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] like Figures 1 to 4 As shown, in this embodiment, a coating apparatus for processing positive electrode sheets includes:

[0033] Feeding assembly 100, the feeding assembly 100 being used to provide coating medium;

[0034] A spraying assembly 200 is connected to a feeding assembly 100 and includes at least two nozzles arranged opposite each other and having a gap through which the positive electrode 400 passes; when the positive electrode 400 passes through the gap, the nozzles can coat at least one surface of the positive electrode 400.

[0035] The heating assembly 300 includes a heating chamber 311 and a heating element 320. The heating chamber 311 has a heating channel 330 communicating with the outside. The heating element 320 is located within the heating chamber 311 and can heat the positive electrode sheet 400 located within the heating channel 330. This design not only integrates the coating and heating processes, ensuring that the coating medium is fully heated and cured to form a dense protective film, thus significantly enhancing coating adhesion and effectively reducing powder shedding, but also enables simultaneous coating of both sides of the positive electrode sheet 400, greatly improving coating efficiency.

[0036] Specifically, such as Figure 1 As shown, in this embodiment, the coating apparatus includes a feeding assembly 100, a spraying assembly 200, and a heating assembly 300 arranged sequentially from left to right. The feeding assembly 100 provides the coating medium, the spraying assembly 200 sprays the coating medium onto the surface of the positive electrode 400, and the heating assembly 300 heats the coating medium on the surface of the positive electrode 400, causing it to solidify into a uniform and dense polymer film on the surface of the positive electrode 400, thereby reducing powder shedding from the positive electrode.

[0037] like Figure 1 , Figure 2 As shown, in this embodiment, the feeding assembly 100 includes a material tank 110 and a feeding drive structure 120. The material tank 110 is used to store the coating medium, and the feeding drive structure 120 is connected to the material tank 110 and the nozzle respectively, and can drive the coating medium to flow to the nozzle. This design realizes automated control of the coating medium delivery, ensuring the uniformity and stability of the coating medium supply.

[0038] In this embodiment, the material barrel 110 is funnel-shaped, vertically arranged, and has an opening at the top, serving as a storage structure for the coating medium to achieve a continuous supply of the coating medium.

[0039] In this embodiment, the feeding drive structure 120 is a hollow structure, vertically positioned at the lower right of the material tank 110. It is equipped with a first feeding connector 121, a second feeding connector 122, and an air inlet connector 123. The first feeding connector 121 is connected to the first nozzle 210 via a hose, and the second feeding connector 122 is connected to the second nozzle 211 via a hose. The air inlet connector 123 is connected to an air source (not shown in the figure). When the air inlet connector 123 is connected to the air source, the feeding drive structure 120, under gas pressure, drives the coating medium within it to flow towards the first nozzle 210 and the second nozzle 211. This gas-driven design is simple, efficient, and stable. Furthermore, the connection design of the first feeding connector 121 and the second feeding connector 122 to the first nozzle 210 and the second nozzle 211 respectively ensures that the coating medium can be evenly distributed into the two nozzles, achieving synchronous and consistent double-sided coating.

[0040] Preferably, in this embodiment, the air inlet connector 123 is located at the top of the feeding drive structure 120, and the first feeding connector 121 and the second feeding connector 122 are arranged side by side at the bottom of the feeding drive structure 120, and the air inlet connector 123, the first feeding connector 121 and the second feeding connector 122 are all connected to the interior of the feeding drive structure 120. This design, on the one hand, allows the gas pressure to push the coating medium downward more efficiently, avoiding the problem of poor feeding caused by gravity or pipeline resistance; on the other hand, the side-by-side design ensures that the coating medium flows to the first nozzle 210 and the second nozzle 211 at the same flow rate, thereby achieving consistency in double-sided coating.

[0041] In this embodiment, a metering tank 130 is also provided between the material tank 110 and the feeding drive structure 120. One end of the metering tank 130 is connected to the material tank 110 through a first pipe 140, and the other end is connected to the feeding drive structure 120 through a second pipe 141. The introduction of the metering tank 130 enables precise control of the coating medium supply, avoids flow fluctuations, and further improves coating accuracy. In addition, through the precise control of the metering tank 130, users can flexibly adjust the supply of coating medium according to different process requirements, enhancing the system's adaptability to various coating tasks.

[0042] Preferably, in this embodiment, the metering tank 130 is vertically positioned directly below the material tank 110, with one end connected to the bottom of the material tank 110 via a first pipe 140, and the other end connected to the middle of the feeding drive structure 120 via a second pipe 141. This design can accurately collect the coating medium flowing out of the material tank 110 and achieve quantitative delivery through its internal volume limitation, avoiding over- or under-dispensing and ensuring the consistency of the coating thickness.

[0043] In this embodiment, a first control valve 150 is provided on the first pipe 140, a second control valve 151 is provided on the second pipe 141, and a third pipe 142 communicating with the outside is also provided on the first pipe 140, with an exhaust valve 152 provided on the third pipe 142. The first control valve 150 controls the connection and disconnection between the material tank 110 and the metering tank 130, thereby preventing the material tank 110 from continuing to supply material after the coating medium in the metering tank 130 has reached the required quantity. The second control valve 151 controls the connection and disconnection between the metering tank 130 and the feeding drive structure 120, thereby preventing gas backflow into the metering tank 130 during operation of the feeding drive structure 120. The exhaust valve 152 effectively removes residual air from the pipes, preventing blockages and ensuring a stable supply of the coating medium.

[0044] Preferably, in this embodiment, two sets of the first control valve 150 are provided. The redundant design of the first control valve 150 not only improves the stability and safety of the feeding system but also enhances its ability to adapt to complex working conditions, providing a strong guarantee for the efficient and reliable operation of the positive electrode 400 processing.

[0045] In this embodiment, the feeding method of the feeding assembly 100 is as follows: first, the coating medium is injected into the material tank 110, then the first control valve 150 is connected to allow the coating medium to enter the metering tank 130. After the coating medium in the metering tank 130 reaches a quantitative value, the first control valve 150 is disconnected, and the second control valve 151 is connected to allow the coating medium to enter the feeding drive structure 120. When there is gas in the pipeline, the second control valve 151 and the first control valve 150 below the material tank 110 can be disconnected, and the exhaust valve 152 can be connected to exhaust gas.

[0046] Preferably, in this embodiment, the first control valve 150, the second control valve 151, and the exhaust valve 152 are all solenoid valves.

[0047] like Figure 1 , Figure 3As shown, in this embodiment, the spraying assembly 200 includes at least two nozzles arranged opposite each other, with a gap between the nozzles for the positive electrode sheet 400 to pass through. When the positive electrode sheet 400 passes through the gap, the nozzles can coat a single surface or both surfaces of the positive electrode sheet 400 simultaneously. Compared with a single nozzle design, this design can meet the requirement of uniform coating on both sides, effectively improving the coating efficiency.

[0048] In this embodiment, the spraying assembly 200 includes a spraying box 220, which has an inverted trapezoidal structure and a downward-recessed receiving groove 221, with the nozzle disposed within the receiving groove 221. When the nozzle coats the positive electrode sheet 400, the receiving groove 221 restricts the coating medium from splashing out. The design of the spraying box 220 prevents the coating medium from splashing into the external environment, thereby reducing contamination of surrounding equipment and operating areas, and reducing the workload of cleaning and maintenance.

[0049] In this embodiment, the nozzle includes a first nozzle 210 and a second nozzle 211. The first nozzle 210 and the second nozzle 211 are detachably mounted in the receiving groove 221 via a mounting bracket (not shown in the figure) and are arranged opposite each other in an upper and lower structure. This design not only ensures the uniformity of double-sided coating, but also allows users to flexibly adjust the nozzle position according to the thickness of the positive electrode sheet 400 or process requirements, thereby improving the versatility and applicability of the device.

[0050] In this embodiment, the receiving groove 221 is also provided with a plurality of rotatable rollers 230, which can guide the positive electrode sheet 400 into the gap. Since the first nozzle 210 and the second nozzle 211 are built into the receiving groove 221, this design ensures that the positive electrode sheet 400 can accurately enter the gap, avoiding the positive electrode sheet 400 from shifting or getting stuck during movement, and effectively improving the coating accuracy and stability.

[0051] In this embodiment, the roller shaft 230 includes a first roller shaft 231, a second roller shaft 232, a third roller shaft 233, and a fourth roller shaft 234 arranged in a U-shape in a vertical plane. The first roller shaft 231 and the second roller shaft 232 are located on opposite sides of the opening of the receiving groove 221, while the third roller shaft 233 and the fourth roller shaft 234 are located on opposite sides between the first nozzle 210 and the second nozzle 211, and are aligned with the gap. This design further optimizes the conveying path of the positive electrode sheet 400, ensuring that it can smoothly enter the gap and smoothly move from the gap and the receiving groove 221 towards the heating assembly 300.

[0052] like Figure 1 , Figure 4As shown, in this embodiment, the heating assembly 300 includes a heating chamber 310 and a heating element 320. The heating chamber 310 has a built-in heating chamber 311, and the heating chamber 311 is provided with a heating channel 330 communicating with the outside. The heating element 320 is disposed in the heating chamber 311 and can heat the positive electrode 400 located in the heating channel 330. The introduction of this heating assembly 300 realizes the integrated design of coating and heating processes, ensuring that the coating medium is fully heated and cured to form a dense protective film, thereby significantly enhancing the coating adhesion and effectively reducing powder shedding.

[0053] In this embodiment, two sets of heating elements 320 are arranged in an upper and lower structure opposite each other, forming a clamping shape over the heating channel 330. This design enables the positive electrode 400 within the heating channel 330 to be heated uniformly and fully from all directions, ensuring that the coating medium is fully cured and effectively improving the coating quality and performance.

[0054] In this embodiment, an unwinding device (not shown in the figure) and a winding device (not shown in the figure) are also included. The unwinding device is used to unwind and transfer the positive electrode sheet 400, and the winding device is used to wind up the dried positive electrode sheet 400. The unwinding device is located at the input end of the receiving groove 221, and the winding device is located at the output end of the heating channel 330.

[0055] like Figure 1 As shown, the working process of the coating device is as follows: First, the guide wire of the positive electrode sheet 400 on the unwinding device passes sequentially around the first roller 231, the third roller 233, the fourth roller 234, and the second roller 232, and then passes through the heating channel 330 and connects to the winding device; after the feeding assembly 100 completes the feeding, the winding device is started, driving the guide wire to move the positive electrode sheet 400 into the spray box 220; when the positive electrode sheet 400 moves between the first nozzle 210 and the second nozzle 211, the feeding drive structure 120 is started to coat the positive electrode sheet 400 on both sides. After that, the positive electrode sheet 400 continues to move into the heating channel 330, and after being heated by the heating element 320, it is wound up by the winding device.

Claims

1. A coating apparatus for processing positive electrode sheets, characterized in that, include: A feeding assembly for providing a coating medium; A spraying assembly connected to the feeding assembly includes at least two nozzles arranged opposite each other and having a gap for the positive electrode sheet to pass through; when the positive electrode sheet passes through the gap, the nozzles can coat at least one surface of the positive electrode sheet. A heating assembly includes a heating chamber and a heating element. The heating chamber has a heating channel communicating with the outside. The heating element is located in the heating chamber and can heat the positive electrode plate located in the heating channel.

2. The coating apparatus for processing positive electrode sheets according to claim 1, characterized in that, The spraying assembly includes a spraying box with a receiving groove, and the nozzle is disposed in the receiving groove; when the nozzle coats the positive electrode sheet, the receiving groove can limit the splashing of the coating medium.

3. The coating apparatus for processing positive electrode sheets according to claim 2, characterized in that, The nozzle includes a first nozzle and a second nozzle, which are detachably disposed in the receiving groove and arranged in an upper and lower structure opposite each other.

4. The coating apparatus for processing positive electrode sheets according to claim 3, characterized in that, The receiving groove is also provided with multiple rotatable rollers, which can guide the positive electrode sheet into the gap.

5. A coating apparatus for processing positive electrode sheets according to claim 4, characterized in that, The roller shaft includes a first roller shaft, a second roller shaft, a third roller shaft, and a fourth roller shaft. The first roller shaft and the second roller shaft are respectively located on both sides of the opening of the receiving groove, and the third roller shaft and the fourth roller shaft are respectively located on both sides between the first nozzle and the second nozzle, and are on the same straight line as the gap.

6. The coating apparatus for processing positive electrode sheets according to claim 3, characterized in that, The feeding assembly includes a material tank and a feeding drive structure. The material tank is used to store the coating medium, and the feeding drive structure is connected to the material tank and the nozzle respectively, and can drive the coating medium to flow to the nozzle.

7. A coating apparatus for processing positive electrode sheets according to claim 6, characterized in that, The feeding drive structure is a hollow structure, which is provided with a first feeding connector, a second feeding connector and an air inlet connector. The first feeding connector is connected to the first nozzle, the second feeding connector is connected to the second nozzle, and the air inlet connector is connected to an air source. When the air inlet connector is connected to the air source, it can drive the coating medium to flow to the first nozzle and the second nozzle.

8. A coating apparatus for processing positive electrode sheets according to claim 6, characterized in that, A metering tank is also provided between the material hopper and the material supply drive structure. One end of the metering tank is connected to the material hopper through a first pipe, and the other end is connected to the material supply drive structure through a second pipe.

9. A coating apparatus for processing positive electrode sheets according to claim 8, characterized in that, The first pipe is equipped with a first control valve, the second pipe is equipped with a second control valve, and the first pipe is also equipped with a third pipe that communicates with the outside, and the third pipe is equipped with an exhaust valve.

10. A coating apparatus for processing positive electrode sheets according to claim 1, characterized in that, The heating element is provided in two sets, arranged in an upper and lower structure, and clamps the heating channel.

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