A battery slurry coating apparatus

Abstract

This invention relates to the field of battery slurry coating technology, specifically to a battery slurry coating equipment, including a battery slurry coating machine. A coating table is fixedly installed on the upper surface of the battery slurry coating machine. An intelligent moving gantry is movably connected above the coating table. A lifting seat is provided on the inner side of the intelligent moving gantry. A slit coating mechanism and a coating rod mechanism are movably installed on the inner side of the lifting seat. By combining the slit and rod mechanisms, along with a slurry pre-laying mechanism added between them, the lateral flowability of the coating material in the axial direction during coating is improved, reducing or eliminating rod texture, enhancing the adaptability of rod coating, and improving the performance of coated products. The combined design of the air duct assembly and the air guide assembly breaks through the limitations of traditional straight air ducts. The arc-shaped structure guides the airflow to a uniform distribution, providing guiding airflow to the slurry and pre-laying rollers in the coating rod mechanism's coating direction.

Description

Technical Field

[0001] This invention relates to the field of battery slurry coating technology, specifically to a battery slurry coating device. Background Technology

[0002] In the production of new energy batteries, battery slurry coating is a key step in lithium battery manufacturing, directly affecting electrode performance, battery energy density, cycle life, and safety. Its core objective is to uniformly coat active materials, conductive agents, and binders onto the current collector (copper foil / aluminum foil) to form an electrode sheet of uniform thickness. The uniformity and adhesion of the coating also directly affect the battery's performance and lifespan. Coating machines can handle slurries ranging from low to high viscosity through extrusion direct coating or scraper coating, achieving ultra-thin coatings.

[0003] In the prior art, such as the fuel cell coating apparatus and method disclosed in CN101543810B, the coating apparatus includes a base, a platform disposed on the base, and a coating blade that moves relative to the platform. The platform is provided with vacuum adsorption holes connected to a centrifugal fan; a heating device is provided at the bottom of the platform; a liquid distributor is provided on the coating blade, which is connected to a feeding device via a conduit; and a method for coating a substrate using the above-mentioned coating apparatus is provided. The above-mentioned document has the advantages of easy fixation of carbon paper, simultaneous coating and drying processes, and uniform and controllable material feeding.

[0004] However, in actual use, existing coating die cavities typically employ a single-channel design with a simple flow channel structure. The slurry within the die cavity is affected by the Bernoulli effect, resulting in a high flow velocity and low pressure at the center, while a pressure gradient forms on both sides due to frictional resistance. Consequently, the thickness distribution of the coated electrode usually exhibits a thicker center and thinner edges. This leads to thickness deviations in the formed electrode, affecting its performance. Secondly, the traditional coating equipment has a simple structure and cannot pre-lay the dripping slurry. Direct coating results in air ingress, forming bubbles, a common defect in the coating process. These bubbles can cause localized decreases in electrode conductivity, uneven distribution of active materials, and even internal short circuits in the battery. Therefore, this invention proposes a battery slurry coating equipment to solve the problems of existing coating equipment having a single coating structure, being prone to edge thickening effect, resulting in uneven distribution of battery internal resistance, affecting cycle life, and being prone to defects such as air entrapment, sagging, and streaks that affect the performance of battery electrodes. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a battery slurry coating device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a battery slurry coating equipment, comprising a battery slurry coating machine, wherein a coating table is fixedly installed on the upper surface of the battery slurry coating machine, and an intelligent moving gantry is movably connected above the coating table. A lifting seat is provided on the inner side of the intelligent moving gantry, and a slit coating mechanism and a coating rod mechanism are movably installed on the inner side of the lifting seat. The slit coating mechanism consists of a fixed side plate, a left die head, and a right die head. The fixed side plate is fixedly installed at both ends of the left die head and the right die head by bolts. A slurry flow channel is provided between the inner sides of the left die head and the right die head, and a slit lip is provided at the output end of the slurry flow channel. A slurry pre-laying mechanism is provided between the slit coating mechanism and the coating rod mechanism. The slurry pre-laying mechanism includes a support component, a connecting component, an air duct component, and an air guiding component. The support component is located on the side of the two sets of fixed side plates near the coating rod mechanism.

[0007] Preferably, the input end of the slurry flow channel is provided with a sluice port, the inner side of the sluice port is threaded with a sluice pipe, the inner side of the slurry flow channel is provided with a gradient flow channel assembly, the gradient flow channel assembly includes a triangular flow channel, the center of the triangular flow channel is connected to the sluice port, the lower end of the triangular flow channel is provided with a plurality of stepped overflow ports, the diameter of the plurality of stepped overflow ports increases sequentially from the center to the outside, and the output end of the stepped overflow ports is connected to the slit lip.

[0008] Preferably, the support assembly includes support side plates, and two sets of support side plates are provided and fixedly installed on one side surface of the fixed side plate by bolts. A through truss is connected through the center of the two sets of support side plates, and a U-shaped horizontal slide bar is slidably installed on the upper surface of the through truss.

[0009] Preferably, the connecting assembly includes a central connecting plate, the outer surface of which is movably engaged with one end of each of the two sets of supporting side plates, and circular protruding blocks are fixedly installed on the upper surfaces of both sides of the central connecting plate, with a locking hole provided between the two sets of circular protruding blocks.

[0010] Preferably, the connecting assembly further includes a motor, which is fixedly installed on the outside of the central connecting plate. A rotating disk is fixedly connected to the output shaft of the motor. An eccentric limiting post is fixedly connected to the inner surface of the rotating disk. A connecting rod is rotatably connected to the outer surface of the eccentric limiting post, and a connecting protrusion is rotatably connected to the other end of the connecting rod. A fixing block is fixedly connected to the outer surface of the connecting protrusion, and the fixing block is fixedly installed on one side surface of the U-shaped horizontal slide bar.

[0011] Preferably, the supporting side plate has a reserved opening at one end near the central connecting plate. A locking component is provided inside the reserved opening. The locking component includes a locking post, a spring one, and a spring two. The spring one and spring two are slidably sleeved on the outside of the locking post. The outer surface of the locking post is slidably connected to the inner wall of the supporting side plate. One end of the inner side of the locking post is rounded. The outer surface of the rounded corner is movably connected to the outer surface of the circular protrusion block, and the outer surface of the rounded corner is movably engaged with the inner wall of the lock hole.

[0012] Preferably, the air duct assembly includes a rectangular air plate, which is fixedly installed at the lower end of a U-shaped horizontal slide bar. An air guide pump is provided on the outer side of the rectangular air plate, and the air guide pump is connected to the rectangular air plate through an air duct. A docking slot is provided on the side of the rectangular air plate away from the air guide pump.

[0013] Preferably, the air guide assembly includes an arc-shaped cavity plate, the upper outer surface of which is movably fitted into the inner wall of the docking slot, and the arc-shaped cavity plate is fixedly connected to the outer surface of the rectangular air plate by bolts. An air inlet slot is evenly provided on the inner wall of the arc-shaped cavity plate near the rectangular air plate, and an arc-shaped air duct is provided on the inner side of the arc-shaped cavity plate, which is connected to the air inlet slot. An internal exhaust hole is provided at the output end of the arc-shaped air duct.

[0014] Preferably, the side of the arc-shaped cavity plate away from the coating wire rod mechanism is sealed with an embedded arc-shaped cavity plate, the end of the embedded arc-shaped cavity plate near the rectangular air plate is provided with an airflow inlet, the inner cavity of the embedded arc-shaped cavity plate is provided with an arc-shaped air duct II, and the output end of the arc-shaped air duct II is provided with an external exhaust port.

[0015] Preferably, the lower end of the arc-shaped cavity plate is provided with a reserved groove, and a pre-laying roller is rotatably connected to the inner wall of the reserved groove. The outer surface of the pre-laying roller is uniformly provided with tiny raised discs.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention proposes a battery slurry coating equipment that combines a slit and a bar coating mechanism with an added slurry pre-laying mechanism. This improves the lateral flowability of the coating axially during coating, reduces or eliminates bar streaks, enhances the adaptability of bar coating, and improves the performance of coated products. Furthermore, by optimizing the slurry flow channel structure within the slit coating mechanism and adopting a gradient flow channel design, dynamic pressure compensation within the flow channel is achieved, eliminating edge pressure attenuation and ensuring that the slurry flows out uniformly and synchronously from the slit lip. The combined design of the air duct component and the air guide component overcomes the limitations of traditional straight air ducts. The arc-shaped structure guides the airflow to distribute it evenly, providing directional airflow to the slurry and pre-laying rollers in the coating bar mechanism's coating direction. This directional airflow not only propels the slurry to uncovered areas, compensating for potential edge or localized slurry shortages during rolling, but also breaks up bubble agglomerations in the slurry, reducing pinholes or streaks on the coating surface, further improving battery electrode production efficiency and overall performance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the present invention. Figure 1 ; Figure 3 This is a partial three-dimensional structural diagram of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the connection structure between the slit coating mechanism and the slurry pre-laying mechanism of the present invention. Figure 5 This is a top view schematic diagram of the connection structure between the slit coating mechanism and the slurry pre-laying mechanism of the present invention; Figure 6 For the present invention Figure 5 A magnified structural diagram at point A; Figure 7 This is a side view schematic diagram of the connection structure between the slit coating mechanism, the slurry pre-laying mechanism, and the coating line bar mechanism of the present invention. Figure 8 This is a schematic diagram showing the disassembled structure of the slit coating mechanism and the slurry pre-laying mechanism of the present invention; Figure 9 For the present invention Figure 8 A magnified structural diagram at point B; Figure 10 This is a three-dimensional structural diagram of the slurry pre-laying mechanism of the present invention; Figure 11 For the present invention Figure 10 A magnified structural diagram at point aa; Figure 12 For the present invention Figure 11A magnified structural diagram at point C; Figure 13 For the present invention Figure 10 Enlarged structural diagram of the bb section; Figure 14 For the present invention Figure 13 A magnified structural diagram at point D; Figure 15 For the present invention Figure 13 A magnified structural diagram at point E; Figure 16 This is a top view of the slurry pre-laying mechanism of the present invention; Figure 17 This is a side view of the slurry pre-laying mechanism of the present invention; Figure 18 This is a schematic diagram of the disassembled structure of the single unit and the arc-shaped cavity plate of the present invention.

[0018] In the diagram: 1. Battery slurry coating machine; 11. Coating table; 12. Intelligent moving gantry; 13. Lifting seat; 2. Slit coating mechanism; 20. Slit lip; 21. Fixed side plate; 22. Left die head; 23. Right die head; 24. Injection pipe; 240. Injection port; 2401. Triangular flow channel; 2402. Stepped overflow port; 3. Coating line bar mechanism; 4. Slurry pre-laying mechanism; 41. Supporting side plate; 411. Through truss; 4111. Rigid elastic bar; 4112. Polarizing sphere; 410. Reserved opening; 412. Locking post. ; 413, Spring 1; 414, Spring 2; 420, Locking hole; 4201, Circular convex contact block; 42, Central connecting plate; 421, Motor; 422, Rotary disk; 423, Eccentric limiting post; 424, Connecting rod; 425, Connecting protrusion; 426, Fixing block; 43, U-shaped horizontal slide bar; 44, Rectangular air plate; 440, Butt joint groove; 45, Arc-shaped cavity plate; 450, Air inlet groove; 4500, Arc-shaped air duct 1; 4501, Internal exhaust hole; 451, Embedded arc-shaped cavity plate; 4510, External exhaust port; 46, Pre-laying roller. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0020] Example 1, refer to Appendix Figures 1-17This invention provides a technical solution: a battery slurry coating device, including a battery slurry coating machine 1. A coating table 11 is fixedly installed on the upper surface of the battery slurry coating machine 1. An intelligent moving gantry 12 is movably connected above the coating table 11. A lifting seat 13 is provided inside the intelligent moving gantry 12. A slit coating mechanism 2 and a coating line rod mechanism 3 are movably installed inside the lifting seat 13. The slit coating mechanism 2 consists of a fixed side plate 21, a left die head 22, and a right die head 23. The fixed side plate 21 is fixedly installed on the left die head 22 and the right die head 23 by bolts. At both ends of head 23, a slurry flow channel is provided between the inner sides of the left mold head 22 and the right mold head 23. The input end of the slurry flow channel is provided with a slurry inlet 240. The inner side of the slurry inlet 240 is threadedly connected to a slurry pipe 24. The upper end of the slurry pipe 24 is connected to a slurry pump. The input end of the slurry pump is connected to a storage tank. A slurry pre-laying mechanism 4 is provided between the slit coating mechanism 2 and the coating rod mechanism 3. The slurry pre-laying mechanism 4 includes a support component, a connecting component, an air duct component, and an air guide component. The support component is located on the side of the two sets of fixed side plates 21 near the coating rod mechanism 3. In this embodiment, when using the coating equipment, a 15-micron thick battery-grade aluminum foil is used as the substrate for positive electrode coating. The slurry consists of LiFePO4, carbon black, and PVDF binder, which are mixed and dispersed in NMP solvent in a certain proportion. After stirring evenly, the slurry is prepared. N-methylpyrrolidone is used as the solvent for the slurry to adjust its viscosity. Before coating, the aluminum foil substrate is pretreated to ensure its surface cleanliness and enhance the adhesion of the coating. During the coating process, the aluminum foil substrate is heated to enhance the adhesion of the coating. During coating, the treated aluminum foil substrate is fixed on the coating table 11 to ensure it is flat and wrinkle-free. The vacuum system is activated to make the aluminum foil adhere tightly to the coating table 11. Then, the slurry is evenly coated on the surface of the aluminum foil through the slit coating mechanism 2. At this time, attention is paid to controlling the height and moving speed of the coating head to ensure the coating thickness. To ensure consistency, the coating is then fully cured after application. It should be noted that the combination of a slit and a bar coating mechanism, along with the added slurry pre-laying mechanism 4, improves the lateral flow of the coating axially during application, reducing or eliminating bar streaks, enhancing the adaptability of bar coating, and improving the performance of coated products. Furthermore, the combined design of the air duct assembly and the air guide assembly overcomes the limitations of traditional straight air ducts. The arc-shaped structure guides the airflow to a uniform distribution, providing directional airflow to the slurry in the coating bar mechanism 3 and the pre-laying roller 46 in the coating direction. This directional airflow not only propels the slurry to uncovered areas, compensating for potential edge or localized slurry deficiencies during rolling, but also breaks up air bubble agglomerations in the slurry, reducing pinholes or streaks on the coating surface, further improving battery electrode production efficiency and overall performance.

[0021] Example 2, see attached document Figures 1-17Based on Example 1, in order to achieve automated slurry replenishment and ensure uniform slurry distribution: The output end of the slurry channel is provided with a slit lip 20, and the inner side of the slurry channel is provided with a gradient channel assembly, which includes a triangular channel 2401. The center of the triangular channel 2401 is connected to the injection port 240. The lower end of the triangular channel 2401 is provided with a number of stepped overflow ports 2402. The diameter of the stepped overflow ports 2402 increases from the center to the outside, and the output end of the stepped overflow ports 2402 is connected to the slit lip 20. In this embodiment, refer to Figure 8 and Figure 9 As shown, breaking away from the traditional slurry flow channel design, a "coat hanger" gradient flow channel is adopted. When the material is delivered into the injection pipe 24 by the slurry pump, the slurry flows to both sides through the triangular flow channel 2401. Through the arrangement design of several stepped overflow ports 2402, the slurry can be reasonably distributed along the width direction, ensuring that the slurry is evenly distributed to each lateral position of the cavity before entering the slit lip 20. Through this design, the lateral pressure drop is reduced from the source, significantly improving the basic uniformity of the initial coating. It further solves the problem that the traditional coating equipment has a high flow rate and low pressure in the center, and a pressure gradient is formed on both sides due to frictional resistance, which makes the thickness distribution of the coated electrode usually show the characteristics of being thick in the middle and thin at the edges.

[0022] Example 3, refer to Appendix Figures 1-17 Based on Example 2, in order to achieve the overall installation of the slurry pre-laying mechanism 4 and the slot coating mechanism 2: The support assembly includes two sets of support side plates 41, which are fixed to one side surface of a fixed side plate 21 by bolts. A through truss 411 is connected through the center of the two sets of support side plates 41. A U-shaped horizontal slide rod 43 is slidably installed on the upper surface of the through truss 411. A polarizing element is provided on the inner side of the lower end of the through truss 411. The polarizing element includes a rigid elastic strip 4111 and a polarizing sphere 4112. One end of the rigid elastic strip 4111 is fixedly connected to the inner surface of the through truss 4111, and the other end of the rigid elastic strip 4111 is fixedly connected to the polarizing sphere 4112. The outer surface is in movable contact with both ends of the U-shaped horizontal slide bar 43; by adding a polarizing element, the U-shaped horizontal slide bar 43 can intermittently contact the surface of the polarizing sphere 4112 during horizontal movement, assisting the pre-laying roller 46 to vibrate slightly. Vibration can cause air bubbles in the slurry to rise and break, reducing coating defects. Vibration also helps the slurry penetrate into the micropores of the substrate, improving adhesion. Vibration can also make the slurry surface smoother, reduce roughness, and improve the efficiency and quality of subsequent coating. The connecting component includes a central connecting plate 42, the outer surface of which is movably engaged with one end of each of the two sets of supporting side plates 41. The two sides of the central connecting plate 42 are... Circular protruding contact blocks 4201 are fixedly installed on the surface, and a locking hole 420 is provided between two sets of circular protruding contact blocks 4201; the connecting assembly also includes a motor 421, which is fixedly installed on the outside of the central connecting plate 42. A rotating disk 422 is fixedly connected to the output shaft of the motor 421. An eccentric limiting post 423 is fixedly connected to the inner surface of the rotating disk 422. A connecting rod 424 is rotatably connected to the outer surface of the eccentric limiting post 423, and a connecting protrusion 425 is rotatably connected to the other end of the connecting rod 424. A fixing block 426 is fixedly connected to the outer surface of the connecting protrusion 425. The fixing block 426 is fixedly installed on the U The horizontal slide bar 43 has a reserved opening 410 at one end of the support side plate 41 near the central connecting plate 42. A locking assembly is provided inside the reserved opening 410. The locking assembly includes a locking post 412, a spring 1 413 and a spring 2 414. The spring 1 413 and the spring 2 414 are slidably sleeved on the outside of the locking post 412. The outer surface of the locking post 412 is slidably connected to the inner wall of the support side plate 41. One end of the inner side of the locking post 412 is set as a rounded corner. The outer surface of the rounded corner is movably connected to the outer surface of the circular protrusion block 4201, and the outer surface of the rounded corner is movably engaged with the inner wall of the lock hole 420. In this embodiment, support side plates 41 are connected to one side of each of the two sets of fixed side plates 21. The two sets of L-shaped support side plates 41 form a guard arm structure. The gap between the two sets of support side plates 41 is compensated by the central connecting plate 42. When the central connecting plate 42 completely compensates for the gap between the support side plates 41, automatic locking is achieved. For details, please refer to... Figure 5 , Figure 6 , Figure 13 and Figure 14As shown, when the connecting assembly is pushed inward, the top of a set of inner circular protrusions 4201 first contacts the bottom rounded corner of the locking pin 412. Under the elastic action of spring 1 413 and spring 2 414, the locking pin 412 is lifted slightly upward. With the continued inward pushing action, the bottom rounded corner of the locking pin 412 enters the inner side of the lock hole 420. At this time, spring 1 413 and spring 2 414 cause the bottom of the locking pin 412 to form a self-lock between the lock hole 420 and the locking pin 412 under the reverse elastic force. If it is necessary to disassemble the connecting assembly as a whole, simply pull the locking pin 412 upward with both hands to release the restriction by disengaging the bottom rounded corner of the locking pin 412 from the lock hole 420. When it is necessary to move the U-shaped horizontal slide bar 43, the air duct assembly, the air guide assembly, and the pre-laying roller 46 horizontally, such as Figure 6 As shown, the control motor 421 drives the output shaft to rotate and drive the rotating disk 422 to rotate. Under the eccentric setting of the eccentric limit column 423, the connecting rod 424 swings. Under the limit setting of the through truss 411, the fixed block 426 and the U-shaped horizontal slide bar 43 are moved horizontally. With this setting, when the pre-coating roller 46 moves towards the slit coating mechanism 2, it can not only ensure the pre-coating in the direction of travel, but also realize the transverse interruption of the slurry. This ensures that the transverse flow of the coating along the body axis is further improved during coating, thereby reducing or eliminating the texture of the coating line bar mechanism 3, enhancing the coating adaptability of the coating line bar mechanism 3, and improving the performance of the battery electrode coating product.

[0023] Example 4, see attached document Figures 1-17 Based on Example 3, in order to achieve bidirectional airflow distribution between the coating line bar mechanism 3 and the pre-laying roller 46: The air duct assembly includes a rectangular air vane 44, which is fixedly installed at the lower end of a U-shaped horizontal slide bar 43. An air pump is installed on the outer side of the rectangular air vane 44, and the air pump is connected to the rectangular air vane 44 via an air duct. A mating slot 440 is provided on the side of the rectangular air vane 44 away from the air pump. The air guide assembly includes an arc-shaped cavity plate 45, the upper outer surface of which is movably fitted into the inner wall of the mating slot 440. The arc-shaped cavity plate 45 is fixedly connected to the outer surface of the rectangular air vane 44 by bolts. Air inlet slots 450 are evenly provided on the inner wall of the arc-shaped cavity plate 45 near the rectangular air vane 44, and an air inlet slot 450 is provided on the inner side of the arc-shaped cavity plate 45. An arc-shaped air duct 4500 is connected to the air inlet slot 450. The output end of the arc-shaped air duct 4500 is provided with an internal exhaust port 4501. An embedded arc-shaped air duct 451 is sealed and connected to the side of the arc-shaped cavity plate 45 away from the coating line bar mechanism 3. An airflow inlet is provided at the end of the embedded arc-shaped air duct 451 near the rectangular air plate 44. An arc-shaped air duct 2 is provided in the inner cavity of the embedded arc-shaped air duct 451, and an external exhaust port 4510 is provided at the output end of the arc-shaped air duct 2. A reserved groove is provided at the lower end of the arc-shaped cavity plate 45. A pre-laying roller 46 is rotatably connected to the inner wall of the reserved groove. Small raised discs are evenly provided on the outer surface of the pre-laying roller 46. In this embodiment, as Figures 10-12 As shown, a rectangular air plate 44 is installed at the bottom of a U-shaped horizontal slide bar 43, and an arc-shaped cavity plate 45 is installed on the side near the slit coating mechanism 2. When the air pump is turned on and gas is delivered into the rectangular air plate 44, the airflow passes through the arc-shaped cavity plate 45 and the docking slot 440, achieving guided airflow. At this time, the airflow enters the arc-shaped air duct 4500 through the air inlet slot 450, and through the opening of the inner exhaust hole 4501, it drives the airflow to be sprayed in the direction of the coating bar mechanism 3 pushing the slurry. At this time, the airflow can assist the uniformly opened groove structure on the surface of the coating bar mechanism 3 to transversely break the coating bar mechanism 3 along the body axis, thereby improving the transverse flow of the coating material along the body axis during coating, reducing or eliminating bar texture, and enhancing the adaptability of bar coating; secondly, as Figure 11 As shown, some airflow enters the interior of the embedded arc-shaped cavity plate 451, flows through the arc-shaped air duct two, and is finally ejected through the external exhaust port 4510, causing the airflow to be sprayed onto the surface of the pre-coating roller 46. This arrangement can push the slurry to flow to the uncovered area, making up for the edge or local slurry deficiency that may occur during the rolling process. It can also break up the agglomeration of air bubbles in the slurry, reduce pinhole or streak defects on the coating surface, and further improve the performance of the battery electrode. It is worth noting that the uniform addition of tiny raised discs on the surface of the pre-coating roller 46 can increase the contact area with the slurry, promote the rupture of air bubbles through shear force and friction. Secondly, the rough surface can reduce slurry adhesion, accelerate air bubble release, and further improve the uniformity of battery slurry coating.

[0024] The working principle and usage process of this invention are as follows: In actual use, a battery-grade aluminum foil with a thickness of 15 micrometers is first selected as the positive electrode coating substrate. A slurry prepared by mixing LiFePO4, carbon black and PVDF binder in a certain proportion and dispersing them in NMP solvent is prepared and stirred evenly. Before coating, the aluminum foil substrate is pretreated to ensure its surface is clean and enhance the coating adhesion. The treated aluminum foil substrate is fixed on the coating table 11 to ensure that it is flat and wrinkle-free. The vacuum system is started to make the aluminum foil adhere tightly to the coating table 11. Then, the slurry is evenly and quantitatively dripped onto the aluminum foil surface through the gradient flow channel design of the slit coating mechanism 2. The height and moving speed of the coating head are controlled to ensure that the coating thickness is consistent. Furthermore, the slurry pre-laying mechanism 4 is used to improve the lateral flowability of the coating axial direction. Through the combination design of the air duct component and the air guide component, the airflow is guided to be evenly distributed, providing guiding airflow to the slurry and pre-laying roller 46 in the coating direction of the coating rod mechanism 3. After coating is completed, the coating is completely cured to finally form an electrode sheet with uniform thickness.

[0025] 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 slurry coating device, comprising a battery slurry coating machine (1), wherein a coating table (11) is fixedly installed on the upper surface of the battery slurry coating machine (1), and an intelligent moving gantry (12) is movably connected above the coating table (11), and a lifting seat (13) is provided on the inner side of the intelligent moving gantry (12), characterized in that: The slit coating mechanism (2) and the coating rod mechanism (3) are movably installed on the inner side of the lifting seat (13). The slit coating mechanism (2) consists of a fixed side plate (21), a left mold head (22) and a right mold head (23). The fixed side plate (21) is fixedly installed at both ends of the left mold head (22) and the right mold head (23) by bolts. A slurry flow channel is provided between the inner sides of the left mold head (22) and the right mold head (23). A slit lip (20) is provided at the output end of the slurry flow channel. A slurry pre-laying mechanism (4) is provided between the slit coating mechanism (2) and the coating rod mechanism (3). The slurry pre-laying mechanism (4) includes a support component, a connecting component, an air duct component and an air guide component. The support component is located on the side of the two sets of fixed side plates (21) close to the coating rod mechanism (3).

2. The battery slurry coating equipment according to claim 1, characterized in that: The slurry flow channel has an inlet port (240) at its input end. The inlet port (240) is threaded with an inlet pipe (24). The slurry flow channel has a gradient flow channel assembly on its inner side. The gradient flow channel assembly includes a triangular flow channel (2401). The center of the triangular flow channel (2401) is connected to the inlet port (240). The lower end of the triangular flow channel (2401) is provided with a plurality of stepped overflow ports (2402). The diameter of the plurality of stepped overflow ports (2402) increases sequentially from the center to the outside. The output end of the stepped overflow ports (2402) is connected to the slit lip (20).

3. The battery slurry coating equipment according to claim 1, characterized in that: The support assembly includes a support side plate (41), which has two sets and is fixedly installed on one side surface of a fixed side plate (21) by bolts. A through truss (411) is connected through the center of the two sets of support side plates (41), and a U-shaped horizontal slide bar (43) is slidably installed on the upper surface of the through truss (411).

4. The battery slurry coating equipment according to claim 3, characterized in that: The connecting assembly includes a central connecting plate (42), the outer surface of which is movably engaged with one end of each of the two sets of supporting side plates (41), and circular protruding blocks (4201) are fixedly installed on the upper surfaces of both sides of the central connecting plate (42), and a locking hole (420) is provided between the two sets of circular protruding blocks (4201).

5. The battery slurry coating equipment according to claim 4, characterized in that: The connecting assembly also includes a motor (421), which is fixedly installed on the outside of the central connecting plate (42). A rotating disk (422) is fixedly connected to the output shaft of the motor (421). An eccentric limiting post (423) is fixedly connected to the inner surface of the rotating disk (422). A connecting rod (424) is rotatably connected to the outer surface of the eccentric limiting post (423), and a connecting protrusion (425) is rotatably connected to the other end of the connecting rod (424). A fixing block (426) is fixedly connected to the outer surface of the connecting protrusion (425), and the fixing block (426) is fixedly installed on one side surface of the U-shaped horizontal slide bar (43).

6. The battery slurry coating equipment according to claim 5, characterized in that: The supporting side plate (41) has a reserved opening (410) at one end near the central connecting plate (42). A locking component is provided on the inner side of the reserved opening (410). The locking component includes a locking post (412), a spring one (413) and a spring two (414). The spring one (413) and the spring two (414) are slidably sleeved on the outer side of the locking post (412). The outer surface of the locking post (412) is slidably connected to the inner wall of the supporting side plate (41). One end of the inner side of the locking post (412) is set as a rounded corner. The outer surface of the rounded corner is movably connected to the outer surface of the circular protrusion block (4201), and the outer surface of the rounded corner is movably engaged with the inner wall of the lock hole (420).

7. The battery slurry coating equipment according to claim 5, characterized in that: The air duct assembly includes a rectangular air plate (44), which is fixedly installed at the lower end of a U-shaped horizontal slide bar (43). An air guide pump is provided on the outside of the rectangular air plate (44), and the air guide pump is connected to the rectangular air plate (44) through an air duct. A docking slot (440) is provided on the side of the rectangular air plate (44) away from the air guide.

8. The battery slurry coating equipment according to claim 7, characterized in that: The air guiding assembly includes an arc-shaped cavity plate (45), the upper outer surface of the arc-shaped cavity plate (45) is movably fitted with the inner wall of the docking slot (440), and the arc-shaped cavity plate (45) is fixedly connected to the outer surface of the rectangular air plate (44) by bolts. An air inlet groove (450) is evenly opened on the inner wall of the side of the arc-shaped cavity plate (45) close to the rectangular air plate (44). An arc-shaped air duct (4500) is opened on the inner side of the arc-shaped cavity plate (45) and communicates with the air inlet groove (450). An internal exhaust hole (4501) is opened at the output end of the arc-shaped air duct (4500).

9. The battery slurry coating equipment according to claim 8, characterized in that: The arc-shaped cavity plate (45) is sealed and connected to an embedded arc-shaped cavity plate (451) on the side away from the coating wire rod mechanism (3). An airflow inlet is provided at one end of the embedded arc-shaped cavity plate (451) near the rectangular air plate (44). An arc-shaped air duct II is provided in the inner cavity of the embedded arc-shaped cavity plate (451), and an external exhaust port (4510) is provided at the output end of the arc-shaped air duct II.

10. A battery slurry coating device according to claim 9, characterized in that: The lower end of the arc-shaped cavity plate (45) is provided with a reserved groove, and a pre-laying roller (46) is rotatably connected to the inner wall of the reserved groove. The outer surface of the pre-laying roller (46) is uniformly provided with tiny raised discs.

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