High adhesion lithium battery pole piece ceramic coating precision coating process and device

Abstract

The present application belongs to the technical field of lithium battery pole piece surface functional coating preparation, and discloses a high-adhesion lithium battery pole piece ceramic coating precision coating process and device. In view of the problems that the existing pole piece processing equipment cannot realize synchronous cooperation of coating and rolling, the coating adhesion is poor, the coating precision is low, and the rolling pressure regulation is not accurate, the device is provided with a synchronous linkage conveyor and a rolling belt, and is matched with a reciprocating coating mechanism and a plurality of rolling mechanisms with pressure closed-loop regulation. The corresponding process covers slurry preparation, synchronous conveying, reciprocating coating, accurate rolling, pressure closed-loop regulation and elastic tensioning adaptation procedures. The present application realizes the synchronous cooperation of pole piece conveying, coating and rolling, improves the coating uniformity and density, enhances the adhesion of the coating and the pole piece substrate, and guarantees the cycle life and use safety of the lithium battery.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrode surface functional coating preparation technology, specifically a precision coating process and apparatus for high-adhesion lithium battery electrode ceramic coating. Background Technology

[0002] With the rapid development of new energy vehicles and large-scale energy storage, the market has placed increasingly stringent demands on the energy density, cycle life, and safety performance of lithium batteries. As a key component for energy storage and transmission, the surface condition of lithium battery electrodes directly determines the overall performance of the battery. During charge-discharge cycles, issues such as volume expansion, electrolyte corrosion, and interface reactions can lead to active material shedding and electrode pulverization, resulting in battery capacity decay, increased internal resistance, and in severe cases, even thermal runaway.

[0003] For the rolling process of lithium battery electrodes, there are relevant optimization solutions in the prior art. Chinese utility model patent CN213845328U discloses a tension floating roller and a lithium battery electrode stretching and rolling device. In this solution, the tension floating roller has several annular protrusions spaced circumferentially along its axial direction. The annular protrusions are integrally formed with the tension floating roller, and a recessed area is formed between two adjacent annular protrusions. The corresponding lithium battery electrode stretching and rolling device is used to roll and stretch the electrode, which includes a coated area and an uncoated area. This device integrates a rolling unit and a stretching structure. Through the tension floating roller downstream of the rolling unit, with the annular protrusions corresponding to the uncoated area of ​​the lithium battery electrode, the uncoated area of ​​the lithium battery electrode is stretched and extended, significantly improving the wave and wrinkle problems after the electrode is rolled, and improving the flatness of the electrode.

[0004] The aforementioned solution focuses on improving the stretching, rolling, and flatness of the electrode sheets, but does not address the coating process of the ceramic coating on the electrode surface, thus failing to achieve synchronous coordination between the coating and rolling processes. If this device is used in conjunction with a separate coating equipment, positioning deviations can easily occur during the transfer of the electrode sheets between different process equipment, leading to poor compatibility between the coating and the rolling process, and consequently, problems such as coating damage and decreased adhesion to the electrode substrate. Furthermore, the device lacks a pressure detection and closed-loop control structure; the tension and pressure during the rolling process cannot be adjusted in real time according to changes in parameters such as the ceramic coating thickness and electrode material, making it difficult to achieve stable control of the coating density, ultimately affecting the ion transport efficiency and cycle life of the lithium battery.

[0005] Currently, the industry mostly adopts a separate operation mode for coating and rolling of ceramic coatings on electrodes. This not only results in a complicated overall equipment layout and high energy consumption, but also makes it easy for electrode positioning deviations to occur during transfer between processes, causing defects such as coating offset, missed coating, and damage after rolling. This cannot guarantee the bonding strength between the ceramic coating and the electrode substrate, making it difficult to meet the high safety and long cycle life requirements of lithium batteries. Summary of the Invention

[0006] The purpose of this invention is to provide a precision coating process and apparatus for high-adhesion lithium battery electrode ceramic coating, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A precision coating device for high adhesion lithium battery electrode ceramic coating includes a support frame. First connecting plates are fixedly installed on both sides of the upper surface of the support frame. A conveyor is driven between the two sets of first connecting plates. Second connecting plates are fixedly installed on the upper surface of the first connecting plates. Drive columns are rotatably installed at both ends between the two sets of second connecting plates. Roller belts are fitted on the outer surfaces of the two sets of drive columns. The roller belts are vertically opposite to the conveyor. H-shaped frames are fixedly installed on the upper surfaces of both sides of the two sets of second connecting plates. Rolling mechanisms are fixedly installed on the upper surfaces of the H-shaped frames. The rolling end of the rolling mechanism is located inside the U-shaped frame and can roll against the lower surface of the inner ring of the rolling belt. The U-shaped frame is fixedly installed between the two sets of second connecting plates and is located in the inner space of the rolling belt.

[0008] The aforementioned high-adhesion lithium battery electrode ceramic coating precision coating device comprises: the drive roller shaft of the conveyor and the shaft of one set of drive columns of the roller belt respectively extend through the first connecting plate and the second connecting plate, and the extended ends of the two shafts are respectively fixedly installed with a first gear and a second gear. The first gear and the second gear mesh with each other, so that when the conveyor is running, the drive column drives the roller belt to run synchronously with the conveyor through the meshing of the first gear and the second gear; the shafts at both ends of the other set of drive columns of the roller belt slide through the transverse elongated opening, the transverse elongated opening is opened at one end of the second connecting plate, and a coating mechanism is fixedly installed at one end of the shaft that slides through the transverse elongated opening. The coating mechanism is reciprocally slidably installed in the extension frame, and the extension frame is fixedly installed at one end of the second connecting plate; The outer sides of the first gear and the second gear are covered with covers, which are fixedly installed on the same side end of the first connecting plate and the second connecting plate.

[0009] The above-mentioned high-adhesion lithium battery electrode ceramic coating precision coating device includes: a first guide frame is fixedly installed on the same side end of both sets of second connecting plates; a first square bearing is slidably installed in the first guide frame; the shaft of the corresponding end transmission column of the roller belt is inserted into the two sets of first square bearings; a connecting rod is fixedly installed on one end of the outer surface of the first square bearing; the connecting rod slides through and extends from one end of the first guide frame.

[0010] The aforementioned high-adhesion lithium battery electrode ceramic coating precision coating device includes a spring fitted on the outer surface of the connecting rod, with the two ends of the spring fixedly connected to the end face of the first square bearing and the inner wall end of the first guide rail frame, respectively.

[0011] The aforementioned high-adhesion lithium battery electrode ceramic coating precision coating device comprises: a coating mechanism including a first bevel gear, the first bevel gear being fixedly mounted on the end of a shaft extending from a first square bearing; a second bevel gear meshing with one side of the upper end of the first bevel gear; the second bevel gear being rotatably mounted on the upper surface of an L-shaped rod; the L-shaped rod being fixedly mounted on the side of a first connecting plate; a traction rod being rotatably mounted at an eccentric position on the upper surface of the second bevel gear; the other end of the traction rod being rotatably connected to the upper surface of a connecting tube; and the connecting tube being slidably mounted on the inner upper end of an extension frame.

[0012] The aforementioned high-adhesion lithium battery electrode ceramic coating precision coating device includes a coating nozzle installed on the lower surface of the connecting pipe.

[0013] The above-mentioned high-adhesion lithium battery electrode ceramic coating precision coating device, wherein: one end of the connecting pipe is connected to an inlet pipe.

[0014] The aforementioned high-adhesion lithium battery electrode ceramic coating precision coating device comprises: a roller pressing mechanism including multiple sets of hydraulic rods, which are fixedly installed at equal intervals on the upper surface of an H-shaped frame; the piston rod of each set of hydraulic rods slides through to the lower surface of the H-shaped frame, and the end of the piston rod slides through a U-shaped rod; a second square bearing is fixedly installed at both ends of the lower surface of the multiple sets of U-shaped rods, and the second square bearing is slidably installed in a second guide frame, with the U-shaped rod sliding through the second square bearing and the second guide frame; multiple sets of second guide frames are fixedly installed at equal intervals on the same side of two sets of second connecting plates, and a roller is rotatably installed between each pair of longitudinally opposite second square bearings.

[0015] The above-mentioned high-adhesion lithium battery electrode ceramic coating precision coating device, wherein: the shafts at both ends of the roller are slidably installed in the longitudinal strip opening, the longitudinal strip opening is opened at the same side end of the two sets of second connecting plates, the roller is located in the U-shaped frame, and can be pushed and rolled by the hydraulic rod to contact the lower surface of the inner ring surface of the roller pressing belt; A pressure sensor is fixedly installed on the lower surface of the middle section of the U-shaped rod. The pressure sensor is perpendicular to the hydraulic piston rod inserted inside the U-shaped rod, so that when the hydraulic rod pushes the U-shaped rod vertically downward, the piston rod can press against the upper surface of the pressure sensor. The signal transmitting end of the pressure sensor is communicatively connected to the signal receiving end of the controller, and the control output end of the controller is electrically connected to the electrical control end of the hydraulic rod. The controller can be detachably installed on the conveyor. The pressure sensor is model MLC200, and the controller is model S7-200.

[0016] This invention also provides a precision coating process for high-adhesion lithium battery electrode ceramic coating, implemented using the aforementioned high-adhesion lithium battery electrode ceramic coating precision coating apparatus, comprising the following steps: S1. Slurry preparation and feeding: By weight percentage, mix 30-50% ceramic powder, 2-6% binder, and 0.5-2% dispersant, with the remainder as solvent to prepare ceramic coating slurry. After high-speed dispersion and sand milling, the slurry fineness is ≤0.2μm. The prepared slurry is then introduced into the connecting pipe through the liquid inlet to complete the feeding preparation before coating. S2. Electrode conveying and synchronous linkage: The lithium battery electrode is laid flat on the conveyor and the conveying is started. When the conveyor is running, the transmission is driven by the meshing of the first gear and the second gear, which drives the transmission column to drive the roller belt to run synchronously with the conveyor. The electrode is conveyed by the conveyor to the coating operation position below the coating nozzle. S3, Reciprocating Precision Coating: When the transmission column is running, it synchronously drives the first bevel gear and the second bevel gear to mesh and rotate. The second bevel gear pulls the connecting tube to slide back and forth in the extension frame through the traction rod at its eccentric position. This causes the connecting tube to drive the coating nozzle on its lower surface to reciprocate synchronously, so that the ceramic slurry is evenly sprayed onto the electrode surface to form the initial layer of ceramic coating. S4. Hydraulic precision rolling: After the electrode coating is completed, it is conveyed to the rolling operation position below the rolling belt by the conveyor. The hydraulic rod on the H-shaped frame is activated. The piston rod of the hydraulic rod pushes the U-shaped rod downward, which drives the second square bearing to move down in the second guide frame. This causes the roller to move down along the longitudinal strip and roll to contact the lower surface of the inner ring of the rolling belt. The rolling pressure is then transmitted to the ceramic coating surface of the electrode through the rolling belt. S5. Pressure closed-loop control: During the hydraulic rod pushing process, its piston rod synchronously presses against the pressure sensor on the lower surface of the U-shaped rod. The pressure sensor transmits the detected pressure signal to the controller. The controller adjusts the piston rod extension of the hydraulic rod in real time according to the preset roller pressure threshold, so as to realize the closed-loop precise control of the roller pressure. Through the cooperation of the roller and the roller belt, the ceramic coating on the electrode surface is roller-densified. S6. Elastic tension adaptation: During the rolling process, when the roller presses the lower surface of the inner ring of the roller belt, the roller belt being pushed drives the first square bearing and connecting rod to slide and retract within the first guide frame through the shaft of the transmission column at one end, compressing the spring and forming an elastic tension force. This keeps the roller belt in a taut state and tightly adheres to the electrode surface, offsetting the rigid impact generated by the roller pressing and preventing the roller belt from loosening and the electrode coating from being damaged or uneven in thickness due to uneven pressure.

[0017] Compared with the prior art, the beneficial effects of the present invention are: First, it achieves synchronized and coordinated operation of electrode conveying, coating, and rolling processes. Through the meshing transmission structure of the first and second gears, the conveyor and rolling belt share the same drive source for synchronous operation. Simultaneously, the rotation of the transmission column synchronously drives the coating mechanism to complete the reciprocating spraying action. This eliminates the need for additional independent drive components for the coating and rolling processes, simplifying the overall structure of the device and reducing energy consumption and the probability of malfunctions. Furthermore, the synchronized operation of each process avoids positioning deviations caused by electrode transfer between multiple devices, ensuring the positional accuracy of coating and rolling operations and preventing issues such as incomplete coating or coating misalignment.

[0018] Secondly, it improves the uniformity and forming quality of the ceramic coating. Through the meshing transmission of the first and second bevel gears, combined with the reciprocating traction structure of the traction rod, the reciprocating spraying motion of the coating nozzle is completely synchronized with the conveying motion of the electrode sheet, ensuring uniform spraying of the ceramic slurry across the entire electrode sheet and improving the consistency of the initial coating thickness. Simultaneously, the extension frame provides a stable sliding guide for the connecting pipe, ensuring the smoothness of the reciprocating motion of the coating nozzle and preventing uneven slurry spraying during the coating process.

[0019] Third, it achieves progressive roll densification of the coating, improving the bonding strength between the coating and the electrode substrate. Multiple sets of equidistantly arranged hydraulic rods allow for independent control of the downward stroke of multiple rolls, enabling multi-pass progressive roll densification of the coating and avoiding the cracking and peeling problems caused by single high-pressure roll densification. Simultaneously, the pressure closed-loop control structure formed by pressure sensors and controllers allows for real-time and precise adjustment of the roll densification pressure, ensuring stable and controllable pressure during the roll densification process. This adapts to the roll densification requirements of different electrode materials and coating thicknesses, resulting in a denser coating structure and improved adhesion between the coating and the electrode substrate.

[0020] Fourth, it improves the stability of the device operation process and reduces the coating defect rate. The elastic tensioning structure, composed of the first guide frame, the first square bearing, the connecting rod, and the spring, can counteract the rigid impact generated by the top pressure of the rolls during the rolling process, ensuring the roll belt remains taut and guaranteeing close contact between the roll belt and the electrode surface. This avoids defects such as uneven coating thickness and damage caused by uneven pressure during rolling. Simultaneously, the guiding structure of the second guide frame and the second square bearing ensures the smoothness of the roll pressing process, preventing roll tilting and jamming, further improving the stability of the rolling operation.

[0021] Fifth, it improves the long-term performance and safety of lithium batteries. The electrode ceramic coating prepared by this device has the characteristics of uniform thickness, dense structure, and strong adhesion to the electrode substrate. It can effectively alleviate the problems of active material shedding and electrode pulverization that occur during charge-discharge cycles, reduce the increase in internal resistance and capacity decay rate during battery charge-discharge, and at the same time improve the electrode's resistance to electrolyte corrosion and structural stability, reduce the risk of thermal runaway, and extend the battery's cycle life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the meshing structure of the first gear and the second gear of the present invention; Figure 3 This is a schematic diagram of the structure of the second connecting plate and the extension frame of the present invention; Figure 4 This is a schematic diagram of the coating mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the first square bearing and connecting rod of the present invention; Figure 6 This is a schematic diagram of the roller pressing mechanism of the present invention; Figure 7 This is a schematic diagram of the pressure sensor and U-shaped rod of the present invention.

[0023] In the diagram: 1. Support frame; 101. Conveyor; 102. Horizontal elongated opening; 103. H-shaped frame; 104. Cover; 105. First connecting plate; 106. Second gear; 107. First gear; 108. Second connecting plate; 109. Extension frame; 110. First guide rail frame; 111. First square bearing; 112. Connecting rod; 113. Spring; 114. Transmission column; 115. Roller belt; 116. U-shaped frame; 117. Longitudinal elongated opening; 2. Coating mechanism; 201. L-shaped rod; 202. Second bevel gear; 203. Traction rod; 204. First bevel gear; 205. Connecting pipe; 206. Liquid inlet; 3. Roller mechanism; 301. Hydraulic rod; 302. Second guide rail frame; 303. Second square bearing; 304. Roller; 305. U-shaped rod; 306. Pressure sensor. 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] Example 1 Please see Figures 1-7 This embodiment provides a precision coating device for high-adhesion lithium battery electrode ceramic coating, including a support frame 1. First connecting plates 105 are fixedly installed on both sides of the upper surface of the support frame 1. A conveyor 101 is driven between the two sets of first connecting plates 105. Second connecting plates 108 are fixedly installed on the upper surface of the first connecting plates 105. Drive columns 114 are rotatably installed at both ends between the two sets of second connecting plates 108. Roller belts 11 are fitted onto the outer surfaces of the two sets of drive columns 114. 5. The roller pressing belt 115 is vertically opposite to the conveyor 101. H-shaped frames 103 are fixedly installed on the upper surfaces of the two sets of second connecting plates 108. Roller pressing mechanism 3 is fixedly installed on the upper surface of the H-shaped frame 103. The roller pressing end of the roller pressing mechanism 3 is located inside the U-shaped frame 116 and can roll and contact the lower surface of the inner ring of the roller pressing belt 115. The U-shaped frame 116 is fixedly installed between the two sets of second connecting plates 108 and is located in the inner space of the roller pressing belt 115.

[0026] In this design, the support frame 1 provides a stable mounting foundation for the entire device. Together with the first connecting plate 105 and the second connecting plate 108 fixed to it, they provide precise installation positioning for the conveyor 101 and the roller pressing belt 115, ensuring the relative positional accuracy of the conveying and roller pressing stations. The conveyor 101 enables continuous and stable transport of lithium battery electrodes, providing a continuous and stable working platform for subsequent processes. The roller pressing belt 115, vertically opposite to the conveyor 101, forms a clamping working space, preventing electrode shifting or movement during operation and ensuring positional stability. The H-shaped frame 103 provides robust mounting support for the roller pressing mechanism 3, ensuring structural rigidity during force application and preventing structural swaying. The U-shaped frame 116 provides a limiting and supporting reference for the rolling end of the rolling mechanism 3, so that the top pressure of the rolling mechanism 3 can act stably and evenly on the inner ring surface of the rolling belt 115, ensuring the stability of the rolling force transmission, avoiding excessive deformation of the rolling belt 115 under stress, and ensuring the smooth implementation of the rolling operation.

[0027] Specifically, in this embodiment, the drive roller shaft of the conveyor 101 and the shaft of one set of drive columns 114 of the roller belt 115 respectively extend through the first connecting plate 105 and the second connecting plate 108. The extended ends of the two shafts are respectively fixedly installed with a first gear 107 and a second gear 106. The first gear 107 and the second gear 106 mesh with each other, so that when the conveyor 101 is running, the drive column 114 drives the roller belt 115 to run synchronously with the conveyor 101 through the meshing of the first gear 107 and the second gear 106. The shafts at both ends of the other set of drive columns 114 of the roller belt 115 slide through the transverse elongated opening 102. The transverse elongated opening 102 is opened at one end of the second connecting plate 108. A coating mechanism 2 is fixedly installed at one end of the shaft that slides through the transverse elongated opening 102. The coating mechanism 2 is reciprocally slidably installed in the extension frame 109. The extension frame 109 is fixedly installed at one end of the second connecting plate 108. The first gear 107 and the second gear 106 are covered by a cover 104, which is fixedly installed on the same side end of the first connecting plate 105 and the second connecting plate 108.

[0028] In this design, the meshing transmission structure of the first gear 107 and the second gear 106 enables the conveyor 101 and the roller pressing belt 115 to share the same drive source and operate synchronously. This ensures the consistency between the electrode conveying linear speed and the roller pressing belt 115's operating linear speed, preventing electrode wrinkling and coating scratches caused by relative sliding between the electrode and the roller pressing belt 115. No additional independent drive assembly is needed for the roller pressing belt 115, simplifying the overall structure of the device and reducing energy consumption and the probability of failure. The transverse elongated opening 102 provides a sliding limit for the transmission column 114 at the end of the roller pressing belt 115, ensuring the directional accuracy of the transmission column 114 during sliding. The extension frame 109 provides a stable sliding mounting reference for the coating mechanism 2, ensuring the smoothness of the coating mechanism 2 during reciprocating motion. The cover 104 forms a closed protection for the first gear 107 and the second gear 106, preventing external dust and impurities from entering the meshing transmission parts, ensuring transmission accuracy and stability, and extending the service life of the transmission components.

[0029] Specifically, in this embodiment, a first guide frame 110 is fixedly installed on the same side end of both sets of second connecting plates 108. A first square bearing 111 is slidably installed inside the first guide frame 110. The shaft of the corresponding end transmission column 114 of the roller belt 115 is inserted into the two sets of first square bearings 111. A connecting rod 112 is fixedly installed on one end of the outer surface of the first square bearing 111. The connecting rod 112 slides through and extends from one end of the first guide frame 110.

[0030] In this design, the first guide frame 110 provides precise sliding guidance for the first square bearing 111, strictly limiting the sliding direction of the first square bearing 111 and preventing radial offset of the transmission column 114 during sliding. The first square bearing 111 provides stable rotational support for the transmission column 114, ensuring its smooth operation, and can also slide synchronously along the first guide frame 110 with the transmission column 114, achieving compatibility between the rotational and sliding movements of the transmission column 114. The connecting rod 112, fixedly connected to the first square bearing 111, can synchronously transmit sliding displacement, providing a connection basis for the elastic buffer structure and ensuring the synchronous transmission of sliding movements.

[0031] Specifically, in this embodiment, a spring 113 is fitted on the outer surface of the connecting rod 112, and the two ends of the spring 113 are fixedly connected to the end face of the first square bearing 111 and the end of the inner wall of the first guide rail frame 110, respectively.

[0032] In this design, the spring 113, fitted onto the outer surface of the connecting rod 112, provides a continuous elastic force during the sliding of the first square bearing 111. When the roller belt 115 is stretched under pressure, the first square bearing 111 slides and compresses the spring 113, generating elastic tension to keep the roller belt 115 taut and prevent it from slipping or becoming loose. The elastic buffer structure formed by the spring 113 can counteract the rigid impact generated during the rolling process, preventing damage and uneven thickness of the electrode coating caused by sudden changes in roller pressure, ensuring the smoothness of pressure transmission during the rolling process, and ensuring that the roller belt 115 remains in close contact with the electrode surface.

[0033] Specifically, in this embodiment, the coating mechanism 2 includes a first bevel gear 204, which is fixedly installed on the end of a shaft extending from the first square bearing 111. A second bevel gear 202 is meshed on one side of the upper end of the first bevel gear 204. The second bevel gear 202 is rotatably installed on the upper surface of the L-shaped rod 201, which is fixedly installed on the side of the first connecting plate 105. A traction rod 203 is rotatably installed at an eccentric position on the upper surface of the second bevel gear 202. The other end of the traction rod 203 is rotatably connected to the upper surface of the connecting pipe 205, which is slidably installed on the inner upper end of the extension frame 109.

[0034] In this design, the first bevel gear 204 operates synchronously with the transmission column 114. Through meshing with the second bevel gear 202, the rotational motion of the transmission column 114 is converted into the rotational motion of the second bevel gear 202. This eliminates the need for an independent drive source for the coating mechanism 2; the coating action can be driven solely by the device's own transmission power, simplifying the device structure and reducing equipment costs and energy consumption. The L-shaped rod 201 provides stable mounting support for the second bevel gear 202, ensuring structural stability during meshing and preventing vibration or misalignment. The traction rod 203, eccentrically mounted on the second bevel gear 202, converts the rotational motion of the second bevel gear 202 into the reciprocating linear motion of the connecting pipe 205. Combined with the sliding guide of the extension frame 109, this ensures the smoothness and positional accuracy of the reciprocating motion of the connecting pipe 205, providing a stable foundation for the coating operation.

[0035] Specifically, in this embodiment, a coating nozzle is installed on the lower surface of the connecting pipe 205. In this design, the coating nozzle, installed on the lower surface of the connecting pipe 205, can reciprocate synchronously with the connecting pipe 205, uniformly spraying the ceramic slurry inside the connecting pipe 205 onto the electrode surface, achieving uniform coating across the entire electrode area and avoiding coating blind spots or missed areas. The connection between the coating nozzle and the connecting pipe 205 ensures the continuity and stability of the slurry supply, keeping the slurry spray pressure and flow rate uniform during the coating process, and improving the consistency of the coating thickness.

[0036] Specifically, in this embodiment, one end of the connecting pipe 205 is connected to a liquid inlet 206. In this design, the liquid inlet 206, connected to the end of the connecting pipe 205, provides a stable slurry supply channel for the connecting pipe 205, enabling rapid connection between the external slurry supply system and the coating operation components, ensuring the continuity of slurry supply during the coating process. The liquid inlet 206, located at the end of the connecting pipe 205, will not interfere with the reciprocating sliding motion of the connecting pipe 205, ensuring synchronous compatibility between the slurry supply action and the coating reciprocating action, and avoiding problems such as pipe entanglement and pulling.

[0037] Specifically, in this embodiment, the roller pressing mechanism 3 includes multiple sets of hydraulic rods 301, which are fixedly installed at equal intervals on the upper surface of the H-shaped frame 103; the piston rod of each set of hydraulic rods 301 slides through to the lower surface of the H-shaped frame 103, and the end of the piston rod slides through the U-shaped rod 305; a second square bearing 303 is fixedly installed at both ends of the lower surface of the multiple sets of U-shaped rods 305, and the second square bearing 303 is slidably installed in the second guide frame 302, and the U-shaped rod 305 slides through the second square bearing 303 and the second guide frame 302; multiple sets of second guide frames 302 are fixedly installed at equal intervals on the same side end of the two sets of second connecting plates 108, and a roller 304 is rotatably installed between each pair of longitudinally opposite second square bearings 303.

[0038] The scheme employs multiple sets of hydraulic rods 301, evenly spaced within the H-shaped frame 103, providing an independent and stable force source for the rolling operation. The downward stroke of each set of rolls 304 can be independently adjusted, enabling multi-pass rolling operations. The U-shaped rod 305 provides a transition structure between the force applied by the hydraulic rods 301 and the connection to the second square bearing 303, ensuring that the top pressure of the hydraulic rods 301 is evenly transmitted to both ends of the rolls 304, preventing uneven force distribution and resulting tilting or jamming. The second guide frame 302 provides precise sliding guidance for the second square bearing 303, strictly limiting the downward direction of the rolls 304 and ensuring positional accuracy and smooth movement during the downward pressing process. The second square bearing 303 provides stable rotational support for the rolls 304, ensuring smooth operation, and also slides synchronously along the second guide frame 302 with the rolls 304, achieving compatibility between the rotational and downward pressing actions of the rolls 304.

[0039] Specifically, in this embodiment, the shafts at both ends of the roller 304 are slidably installed in the longitudinal elongated opening 117. The longitudinal elongated opening 117 is opened at the same side end of the two sets of second connecting plates 108. The roller 304 is located in the U-shaped frame 116 and can be pushed and rolled by the hydraulic rod 301 to contact the lower surface of the inner ring surface of the roller pressing belt 115. A pressure sensor 306 is fixedly installed on the lower surface of the middle section of the U-shaped rod 305. The pressure sensor 306 is perpendicular to the piston rod of the hydraulic rod 301 that is inserted inside the U-shaped rod 305, so that when the hydraulic rod 301 pushes the U-shaped rod 305 vertically downward, the piston rod can press against the upper surface of the pressure sensor 306. The signal transmitting end of the pressure sensor 306 is communicatively connected to the signal receiving end of the controller, and the control output end of the controller is electrically connected to the electrical control end of the hydraulic rod 301. The controller can be detachably installed on the conveyor 101. The pressure sensor 306 is model MLC200, and the controller is model S7-200.

[0040] In this design, the longitudinal elongated slot 117 provides sliding limits for the shafts at both ends of the roll 304, further restricting the sliding direction of the roll 304 and preventing radial offset during movement, thus ensuring the fitting accuracy between the roll 304 and the roll pressing belt 115. The U-shaped frame 116 provides limiting space for the installation and operation of the roll 304, ensuring that the top pressure of the roll 304 can be accurately applied to the set area of ​​the roll pressing belt 115, improving the accuracy of force transmission. The pressure sensor 306 can detect the top pressure of the piston rod of the hydraulic rod 301 in real time and transmit the pressure signal to the controller in real time. The controller adjusts the extension of the piston rod of the hydraulic rod 301 in real time according to the preset pressure threshold, forming a closed-loop control of the rolling pressure, ensuring the stability and accuracy of the pressure during the rolling process, and avoiding excessive pressure causing coating damage or insufficient pressure failing to achieve the expected rolling densification effect. The controller is electrically connected to the electrical control terminal of the hydraulic rod 301, enabling independent adjustment and coordinated control of multiple sets of hydraulic rods 301 to adapt to different rolling process requirements.

[0041] Example 2 This embodiment provides a precision coating process for high-adhesion lithium battery electrode ceramic coating, implemented using the high-adhesion lithium battery electrode ceramic coating precision coating apparatus described in Embodiment 1, and includes the following steps: S1. Slurry preparation and feeding: By weight percentage, mix 30-50% ceramic powder, 2-6% binder, and 0.5-2% dispersant, with the remainder as solvent to prepare ceramic coating slurry. After high-speed dispersion and sand milling, the slurry fineness is ≤0.2μm. The prepared slurry is fed into the connecting pipe 205 through the liquid inlet 206 to complete the feeding preparation before coating. The binder can be: polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), sodium carboxymethyl cellulose (CMC), polyacrylic acid (PAA), or polyacrylonitrile (PAN). PVDF is suitable for oil-based systems, while SBR / CMC is suitable for water-based systems.

[0042] The dispersant can be polyethylene glycol (PEG), polyvinylpyrrolidone (PVP), ammonium polyacrylate, sodium dodecyl sulfate (SDS), or hexadecyltrimethylammonium bromide (CTAB), used to prevent ceramic particles from agglomerating and improve the dispersion stability of the slurry.

[0043] Solvents can be: N-methylpyrrolidone (NMP, in combination with PVDF), deionized water (in combination with SBR / CMC), ethanol or acetone, used to dissolve or disperse other components and adjust the viscosity of the slurry.

[0044] S2. Electrode conveying and synchronous linkage: The lithium battery electrode is laid flat on the conveyor 101 and the conveyor is started. When the conveyor 101 is running, the first gear 107 and the second gear 106 mesh and drive the transmission column 114 to drive the roller belt 115 to run synchronously with the conveyor 101. The electrode is conveyed by the conveyor 101 to the coating operation position below the coating nozzle. S3, Reciprocating precision coating: When the transmission column 114 is running, it synchronously drives the first bevel gear 204 and the second bevel gear 202 to mesh and rotate. The second bevel gear 202 pulls the connecting pipe 205 to reciprocate linearly within the extension frame 109 through the traction rod 203 at its eccentric position. This causes the connecting pipe 205 to drive the coating nozzle on its lower surface to reciprocate synchronously, uniformly spraying the ceramic slurry onto the electrode surface to form the initial layer of ceramic coating. S4. Hydraulic precision rolling: After the electrode coating is completed, it is conveyed by the conveyor 101 to the rolling operation position below the rolling belt 115. The hydraulic rod 301 on the H-shaped frame 103 is activated. The piston rod of the hydraulic rod 301 pushes the U-shaped rod 305 downward, which drives the second square bearing 303 to move down in the second guide frame 302. This causes the roller 304 to move down along the longitudinal strip 117 and roll to contact the lower surface of the inner ring surface of the rolling belt 115. The rolling pressure is transmitted to the ceramic coating surface of the electrode through the rolling belt 115. S5. Pressure closed-loop control: During the pushing process of hydraulic rod 301, its piston rod synchronously presses against the pressure sensor 306 on the lower surface of U-shaped rod 305. The pressure sensor 306 transmits the detected pressure signal to the controller. The controller adjusts the piston rod extension of hydraulic rod 301 in real time according to the preset rolling pressure threshold to achieve closed-loop precise control of rolling pressure. Through the cooperation of roller 304 and rolling belt 115, the ceramic coating on the electrode surface is rolled and densified. S6. Elastic tension adaptation: During the rolling process, when the roller 304 presses against the lower surface of the inner ring of the roller pressing belt 115, the roller pressing belt 115, which is pushed, drives the first square bearing 111 and the connecting rod 112 to slide and retract within the first guide frame 110 through the shaft of the transmission column 114 at one end, and compresses the spring 113 to form an elastic tension force. This keeps the roller pressing belt 115 in a taut state and tightly adheres to the electrode surface, thus offsetting the rigid impact generated by the roller 304 pressing and avoiding defects such as loosening of the roller pressing belt 115 and damage or uneven thickness of the electrode coating due to uneven pressure.

[0045] The slurry preparation and feeding steps provided in this solution can produce a uniformly dispersed ceramic coating slurry with the required fineness, providing a stable raw material base for coating and ensuring the structural uniformity of the coating after molding. The electrode conveying and synchronous linkage steps achieve continuous and stable electrode conveying, while ensuring the synchronization of the conveying, coating, and rolling processes, avoiding misalignment between processes and ensuring the positional accuracy of coating and rolling operations. The reciprocating precision coating step, through reciprocating spraying synchronized with electrode conveying, achieves uniform coating of the ceramic slurry on the electrode surface, ensuring the consistency of the initial coating thickness and the integrity of the coverage. The hydraulic precision rolling step uses hydraulically driven rollers to roll the coated coating, making the coating structure denser and improving the bonding strength between the coating and the electrode substrate. The pressure closed-loop control step achieves real-time and precise control of the rolling pressure, ensuring pressure stability during the rolling process, adapting to the rolling requirements of different electrode materials and coating thicknesses, and ensuring consistent rolling results. The elastic tensioning adaptation step uses an elastic tensioning structure to offset the rigid impact during the rolling process, ensuring a tight fit between the rolling belt and the electrode surface, avoiding defects such as coating damage and uneven thickness, and further improving the coating forming quality and structural stability.

[0046] Specifically, in this embodiment, the actual rolling pressure at position x along the rolling direction during the roll densification process satisfies the roll densification control equation, which is as follows:

[0047] in: The coordinates (m) of the starting position of the roll pressing zone; Set the initial roller pressure (MPa); Pressure attenuation coefficient ( This value is related to the elastic modulus of the roll-pressed belt and the properties of the coating material, and ranges from 0.3 to 1.0. ; The progressive roller compression gain coefficient (MPa) is related to the stroke increment of the hydraulic rod and ranges from 1 to 5 MPa. This refers to the number of rolls; The additional reduction (mm) of the i-th roll relative to the previous roll; Initial coating thickness (mm); Let be the coordinates (m) of the roll center position of the i-th roll; The effective length of the roller pressing zone (m); Let be the coordinates (m) of any position along the rolling direction, and ∈[ , + ].

[0048] In the control equation for roller compaction, both the exponential and cosine terms are dimensionless. The actual pressure data collected by the pressure sensor 306 is matched in real time with the target pressure distribution P(x) preset by the controller. The controller dynamically adjusts the piston rod extension of each hydraulic rod 301 according to the matching error to achieve closed-loop adaptive control of the roller pressure.

[0049] Wherein, the additional reduction of the i-th roll It increases in a step-like manner, and mm, achieving a progressive roll-pressing densification process for the coating from light to heavy.

[0050] Example: Combining the process steps S4 (hydraulic precision roller pressing) and S5 (pressure closed-loop control) of this device, and by substituting specific parameters into the equation, the controller adjusts the hydraulic rod stroke in real time based on the calculation results to ensure that the measured pressure distribution matches the target pressure. Precise matching.

[0051] (a) Preset basic parameter table

[0052] (II) Step-by-step calculation 1. Calculation of the basic pressure decay term ; 2. Calculation of additional pressure for each roll First roll:

[0053] Second roll:

[0054] 3rd roll:

[0055] Calculation of total roller pressure distribution

[0056] (III) Application Effect The controller will [do the above] The target pressure curve is set, and pressure sensor 306 collects the actual pressure at x=0.2, 0.5, and 0.8m in real time. If there is an error between the measured pressure and the target value, the controller dynamically adjusts the additional pressure reduction of the corresponding hydraulic rod. Continue until the error is within the allowable range of the process (±0.2MPa).

[0057] IV. Parameter Specification Table

[0058] V. Technical Effects 1. Progressive pressure control: through The step-by-step increase in pressure allows for a gradual rolling process from light to heavy coating, completely avoiding the problem of coating cracking and peeling caused by single-point high-pressure impact. This is highly compatible with the step-by-step control process of the hydraulic rod stroke in this device. 2. Pressure distribution optimization: cosine term To ensure that the pressure of a single roll in the roll pressing zone is evenly distributed with a high center and a low edge, to avoid uneven coating thickness caused by edge effects and to improve the overall smoothness of the coating; 3. Closed-loop adaptive control: Combining pressure sensor 306 and controller (S7-200), the measured pressure is compared with the target pressure in real time. Error, dynamically adjusted It can adapt to the process requirements of different coating thicknesses and electrode materials, without the need for manual recalibration; 4. Improved adhesion and density: Through optimized pressure distribution and progressive loading, the ceramic coating particles and the electrode substrate are tightly bonded and densely packed layer by layer, which significantly improves the bonding strength between the coating and the substrate and reduces the risk of coating peeling off during charge and discharge cycles.

[0059] 5. Rigorizing the physical meaning: exponential term With cosine term All independent variables are dimensionless, and the mathematical calculation results of the equations are completely matched with the actual physical pressure transmission characteristics, avoiding calculation deviations caused by dimensionless function operations and improving the accuracy of pressure control. 6. Minimize calculation error: Dimensional compliance ensures that the controller's numerical calculations are free of formal errors, and the matching error between the measured pressure and the target pressure can be controlled within ±0.2MPa, which is far superior to the ±0.5MPa pressure matching error of traditional control methods; 7. Process adaptability expansion: Starting position of the rolling zone With adjustable parameters, it can adapt to the rolling requirements of different specifications of electrode sheets (width, length), without modifying the mechanical structure. It can be achieved simply by adjusting the controller parameters, thus improving the versatility of the device. 8. Improved data traceability: The dimensions and units of all parameters are standardized, and the measured data collected by the pressure sensor and the control data of the controller can be directly connected to the process database to realize digital traceability and optimization of the rolling process.

[0060] VI. Working Principle and Process Step 1: Model initialization, parameter preset Based on the ceramic coating material and initial thickness of the lithium battery electrode to be processed The core parameters of the modified control equations are preset in the controller: (Initial value) The controller automatically generates the target pressure distribution curve P(x) to complete the model initialization.

[0061] Step 2: Electrode feeding and preparation before rolling. After the electrode is precision coated by reciprocating motion, it is conveyed to the rolling zone by the conveyor 101. Through the synchronous linkage of the first gear 107 and the second gear 106, the rolling belt 115 rotates at the same speed as the conveyor 101, and the electrode precisely enters the starting position of the rolling zone. This completes the pre-rolling positioning.

[0062] Step 3: Real-time pressure acquisition and error calculation The hydraulic rod 301 is activated to drive the roll 304 downwards, and the pressure sensor 306 collects the position of each roll in real time. and the actual pressure at key locations in the rolling zone The controller will Calculate the pressure matching error by comparing it with the target P(x): .

[0063] Step 4: Dynamic error control and hydraulic rod stroke adjustment If the pressure matching error ΔP exceeds the allowable range of the process (±0.2MPa), the controller dynamically adjusts the piston rod extension of the corresponding hydraulic rod according to the direction of the error to achieve additional compression. Real-time control: like Increase the stroke of the corresponding hydraulic rod to lift. This increases additional pressure; like Reduce the stroke of the corresponding hydraulic rod, lower This reduces additional pressure.

[0064] Step 5: Stepped progressive rolling to densify the coating. Multiple sets of hydraulic rods according to the modified The pressure is gradually increased in a step-like manner. The roller 304 transmits the pressure to the coating surface through the roller belt 115, realizing a progressive roller pressing with the attenuation of the basic pressure and the superposition of additional pressure from multiple rollers. This makes the ceramic coating denser layer by layer and avoids high-pressure impact.

[0065] Step 6: Flexible buffering and coordination to optimize pressure transmission During the rolling process, the rigid impact generated by the top pressing of the roller 304 on the pressing belt 115 is offset by the elastic buffer structure composed of the first guide frame 110, the first square bearing 111, the connecting rod 112 and the spring 113. The elastic tension of the spring 113 keeps the pressing belt 115 in close contact with the electrode surface. In conjunction with the corrected pressure distribution model, the uniformity of pressure transmission is further optimized, and local damage to the coating is avoided.

[0066] Step 7: Roll forming complete, data storage and traceability. After the electrode sheet completes the roll forming and densification process, the conveyor 101 transports the electrode sheet to the next process, and the controller automatically stores all parameters of this roll forming process. The system records data such as the number of adjustments and adjustments, and uploads this data to the process database to enable digital traceability and subsequent process optimization.

[0067] Working principle: The power for the entire device is provided by the drive end of the conveyor 101. When the conveyor 101 is running, its transmission roller shaft drives the first gear 107 to rotate synchronously. The first gear 107 drives the second gear 106 to rotate through meshing transmission. The second gear 106 drives the corresponding transmission column 114 of the roller pressing belt 115 to rotate through the shaft, thereby driving the roller pressing belt 115 to operate synchronously with the conveyor 101, ensuring that the linear speed of the electrode conveying is consistent with the linear speed of the roller pressing belt 115, and avoiding relative slippage between the electrode and the roller pressing belt 115.

[0068] While the drive column 114 rotates, the drive column 114 at the other end of the roller belt 115 drives the first bevel gear 204 to rotate synchronously. The first bevel gear 204 drives the second bevel gear 202 to rotate through meshing transmission. The traction rod 203 installed at the eccentric position on the second bevel gear 202 performs a reciprocating traction action with the rotation of the second bevel gear 202, thereby driving the connecting pipe 205 to slide reciprocally in a straight line along the extension frame 109, so that the coating nozzle below the connecting pipe 205 performs a reciprocating spraying action synchronously with the conveying of the electrode sheet, thereby realizing the continuous and uniform coating of ceramic slurry on the surface of the electrode sheet.

[0069] The coated electrode sheet continues to be conveyed by the conveyor 101 and enters the rolling station between the rolling belt 115 and the conveyor 101. At this time, the hydraulic rod 301 installed on the H-shaped frame 103 extends the piston rod downward and pushes the U-shaped rod 305 downward. The U-shaped rod 305 drives the roller 304 to move smoothly down along the second guide frame 302 and the longitudinal strip 117 through the second square bearings 303 at both ends, so that the roller 304 touches the lower surface of the inner ring of the rolling belt 115. The rolling pressure is evenly transmitted to the ceramic coating on the surface of the electrode sheet through the rolling belt 115 to achieve the rolling densification treatment of the coating.

[0070] During the pushing process of the hydraulic rod 301, the end of the piston rod presses against the pressure sensor 306 installed on the U-shaped rod 305. The pressure sensor 306 transmits the pressure signal detected in real time to the controller. The controller adjusts the extension of the piston rod of the hydraulic rod 301 in real time according to the preset pressure parameters, forming a closed-loop control of the rolling pressure to ensure stable and controllable pressure during the rolling process. At the same time, when the roller 304 presses against the rolling belt 115, the rolling belt 115 will drive the corresponding end of the transmission column 114 to move. The transmission column 114 drives the connecting rod 112 to slide along the first guide frame 110 through the first square bearing 111, compressing the spring 113 fitted on the connecting rod 112. The elastic force generated by the spring 113 keeps the rolling belt 115 in a taut state at all times, while offsetting the rigid impact generated during the rolling process, ensuring that the rolling belt 115 is in close contact with the electrode surface.

[0071] How to use: The first step is slurry preparation and equipment setup. The ceramic coating slurry is prepared according to the set component ratio. After high-speed dispersion and sand milling, the mixed slurry is introduced into the connecting pipe 205 through the inlet pipe 206, completing the slurry supply preparation before coating. Simultaneously, the installation status of each component is checked, confirming that the meshing of the first gear 107 and the second gear 106 is normal, the communication connection between the hydraulic rod 301, the pressure sensor 306 and the controller is normal, and the spring 113 and all sliding components move smoothly without jamming.

[0072] The second step is electrode loading and parameter setting. The lithium battery electrodes to be processed are laid flat on the conveyor surface of conveyor 101, ensuring that the electrodes are placed flat and without wrinkles. The roller pressure and stroke parameters of hydraulic rod 301 are set through the controller. According to the width of the electrode and the coating requirements, the spraying parameters of the coating nozzle are adjusted to complete the parameter setting before operation.

[0073] The third step is to start the operation. Start the conveyor 101, which drives the electrode sheet to the coating station smoothly. At the same time, the meshing transmission of the first gear 107 and the second gear 106 drives the roller belt 115 to rotate synchronously. The transmission column 114 drives the coating mechanism 2 to start synchronously. The coating nozzle slides back and forth with the connecting pipe 205, and evenly sprays the ceramic slurry onto the surface of the continuously conveyed electrode sheet to form the initial layer of ceramic coating.

[0074] The fourth step is the densification process by roller pressing. The coated electrode sheet enters the roller pressing station via conveyor 101. The controller activates the hydraulic rod 301 according to preset parameters, driving the roller 304 downwards to press against the roller pressing belt 115, thus performing roller pressing on the ceramic coating on the electrode sheet surface. During the operation, the pressure sensor 306 monitors the roller pressing pressure in real time, and the controller adjusts the extension of the hydraulic rod 301 based on the detection signal to ensure stable roller pressing pressure. Simultaneously, the spring 113, in conjunction with the deformation of the roller pressing belt 115, generates elastic tension to ensure the smoothness of the roller pressing process.

[0075] Step 5: Finishing the work. After all the electrode sheets have been coated and rolled, first shut off the slurry supply, then control the hydraulic rod 301 to drive the roller 304 to reset. After all the electrode sheets on the conveyor 101 have been output, turn off the drive power of the conveyor 101 and clean and maintain the transmission components, spraying components and rolling components of the device.

[0076] Overall technical effect: First, it achieves synchronous and coordinated operation of electrode conveying, coating, and rolling processes. Through the meshing transmission structure of the first gear 107 and the second gear 106, the conveyor 101 and the rolling belt 115 share the same drive source to achieve synchronous operation. Simultaneously, the rotation of the transmission column 114 synchronously drives the coating mechanism 2 to complete the reciprocating spraying action. This eliminates the need for additional independent drive components for the coating and rolling processes, simplifying the overall structure of the device and reducing energy consumption and the probability of malfunctions. Furthermore, the synchronous operation of each process avoids positioning deviations caused by electrode transfer between multiple devices, ensuring the positional accuracy of coating and rolling operations and preventing issues such as incomplete coating or coating misalignment.

[0077] Secondly, it improves the uniformity and forming quality of the ceramic coating. Through the meshing transmission of the first bevel gear 204 and the second bevel gear 202, combined with the reciprocating traction structure of the traction rod 203, the reciprocating spraying motion of the coating nozzle is completely synchronized with the conveying motion of the electrode sheet, ensuring uniform spraying of the ceramic slurry across the entire electrode sheet and improving the consistency of the initial coating thickness. Simultaneously, the extension frame 109 provides a stable sliding guide for the connecting pipe 205, ensuring the smoothness of the reciprocating motion of the coating nozzle and preventing uneven slurry spraying during the spraying process.

[0078] Third, it achieves progressive roll densification of the coating, improving the bonding strength between the coating and the electrode substrate. Multiple sets of equidistantly arranged hydraulic rods 301 allow independent control of the downward stroke of multiple sets of rollers 304, enabling multi-pass progressive roll densification of the coating and avoiding coating cracking and peeling problems caused by single high-pressure roll densification. Simultaneously, the pressure closed-loop control structure formed by the pressure sensor 306 and the controller allows for real-time and precise adjustment of the roll densification pressure, ensuring stable and controllable pressure during the roll densification process. This adapts to the roll densification requirements of different electrode materials and coating thicknesses, resulting in a denser coating structure and improved adhesion between the coating and the electrode substrate.

[0079] Fourth, it improves the stability of the device operation process and reduces the coating defect rate. The elastic tensioning structure composed of the first guide frame 110, the first square bearing 111, the connecting rod 112, and the spring 113 can offset the rigid impact generated by the top pressure of the roll 304 during the rolling process, ensuring that the rolling belt 115 remains taut at all times. This also guarantees a tight fit between the rolling belt 115 and the electrode surface, avoiding defects such as uneven coating thickness and damage caused by uneven pressure during the rolling process. Simultaneously, the guiding structure of the second guide frame 302 and the second square bearing 303 ensures the smoothness of the roll 304's downward pressing process, preventing the roll 304 from tilting or jamming, further improving the stability of the rolling operation.

[0080] Fifth, it improves the long-term performance and safety of lithium batteries. The electrode ceramic coating prepared by this device has the characteristics of uniform thickness, dense structure, and strong adhesion to the electrode substrate. It can effectively alleviate the problems of active material shedding and electrode pulverization that occur during charge-discharge cycles, reduce the increase in internal resistance and capacity decay rate during battery charge-discharge, and at the same time improve the electrode's resistance to electrolyte corrosion and structural stability, reduce the risk of thermal runaway, and extend the battery's cycle life.

[0081] All parts not described in this invention are the same as or can be implemented using existing technology. 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 variations 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 precision coating device for high-adhesion lithium battery electrode ceramic coating, characterized in that, The system includes a support frame (1), on both sides of the upper surface of the support frame (1) a first connecting plate (105) is fixedly installed, a conveyor (101) is driven between the two sets of the first connecting plates (105), a second connecting plate (108) is fixedly installed on the upper surface of the first connecting plate (105), a transmission column (114) is rotatably installed at both ends between the two sets of the second connecting plates (108), and a roller belt (115) is fitted on the outer surface of the two sets of transmission columns (114), the roller belt (115) and the conveyor (101) are vertically opposite each other. H-shaped frames (103) are fixedly installed on the upper surfaces of the two sets of second connecting plates (108). A roller pressing mechanism (3) is fixedly installed on the upper surface of the H-shaped frame (103). The roller pressing end of the roller pressing mechanism (3) is located inside the U-shaped frame (116) and can roll against the lower surface of the inner ring of the roller pressing belt (115). The U-shaped frame (116) is fixedly installed between the two sets of second connecting plates (108) and the U-shaped frame (116) is located in the inner space of the roller pressing belt (115).

2. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 1, characterized in that: The drive roller shaft of the conveyor (101) and the shaft of one set of drive columns (114) of the roller belt (115) extend through the first connecting plate (105) and the second connecting plate (108) respectively. The extended ends of the two shafts are respectively fixedly installed with a first gear (107) and a second gear (106). The first gear (107) and the second gear (106) mesh with each other, so that when the conveyor (101) is running, the drive column (114) is driven by the meshing of the first gear (107) and the second gear (106). The roller belt (115) and the conveyor (101) operate synchronously; the shafts at both ends of the other set of transmission columns (114) of the roller belt (115) slide through and extend from the transverse long slot (102). The transverse long slot (102) is opened at one end of the second connecting plate (108). A coating mechanism (2) is fixedly installed at one end of the shaft that slides through and extends from the transverse long slot (102). The coating mechanism (2) is reciprocally slidably installed in the extension frame (109). The extension frame (109) is fixedly installed at one end of the second connecting plate (108). The outer sides of the first gear (107) and the second gear (106) are covered with covers (104), and the covers (104) are fixedly installed on the same side end of the first connecting plate (105) and the second connecting plate (108).

3. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 1, characterized in that: The first guide frame (110) is fixedly installed on the same side end of the two sets of second connecting plates (108). The first square bearing (111) is slidably installed in the first guide frame (110). The shaft of the corresponding end transmission column (114) of the roller belt (115) is inserted into the two sets of first square bearings (111). A connecting rod (112) is fixedly installed on one end of the outer surface of the first square bearing (111). The connecting rod (112) slides through and extends from one end of the first guide frame (110).

4. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 3, characterized in that: A spring (113) is fitted on the outer surface of the connecting rod (112), and the two ends of the spring (113) are fixedly connected to the end face of the first square bearing (111) and the end of the inner wall of the first guide rail frame (110), respectively.

5. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 2, characterized in that: The coating mechanism (2) includes a first bevel gear (204), which is fixedly installed on the end of a shaft extending from the first square bearing (111). A second bevel gear (202) meshes with the upper side of the first bevel gear (204). The second bevel gear (202) is rotatably installed on the upper surface of an L-shaped rod (201), which is fixedly installed on the side of a first connecting plate (105). A traction rod (203) is rotatably installed at an eccentric position on the upper surface of the second bevel gear (202). The other end of the traction rod (203) is rotatably connected to the upper surface of a connecting pipe (205), which is slidably installed on the inner upper end of an extension frame (109).

6. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 5, characterized in that: The lower surface of the connecting pipe (205) is connected to a coating nozzle.

7. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 5, characterized in that: One end of the connecting pipe (205) is connected to an inlet pipe (206).

8. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 1, characterized in that: The roller pressing mechanism (3) includes multiple sets of hydraulic rods (301), which are fixedly installed at equal intervals on the upper surface of the H-shaped frame (103). The piston rod of each set of hydraulic rods (301) slides through to the lower surface of the H-shaped frame (103), and the end of the piston rod slides through the U-shaped rod (305). The lower surfaces of the multiple sets of U-shaped rods (305) are fixedly installed with second square bearings (303), which are slidably installed in the second guide frame (302). The U-shaped rod (305) slides through the second square bearing (303) and the second guide frame (302). The multiple sets of second guide frames (302) are fixedly installed at equal intervals on the same side of the two sets of second connecting plates (108). Rollers (304) are rotatably installed between each pair of longitudinally opposite second square bearings (303).

9. The precision coating device for high adhesion lithium battery electrode ceramic coating according to claim 8, characterized in that: The shafts at both ends of the roller (304) are slidably installed in the longitudinal slot (117). The longitudinal slot (117) is opened at the same end of the two sets of second connecting plates (108). The roller (304) is located in the U-shaped frame (116) and can be pushed and rolled by the hydraulic rod (301) to contact the lower surface of the inner ring surface of the roller pressing belt (115). A pressure sensor (306) is fixedly installed on the lower surface of the middle section of the U-shaped rod (305). The pressure sensor (306) is perpendicular to the piston rod of the hydraulic rod (301) inserted inside the U-shaped rod (305). When the hydraulic rod (301) pushes the U-shaped rod (305) to move vertically downward, the piston rod can press against the upper surface of the pressure sensor (306). The signal transmitting end of the pressure sensor (306) is communicatively connected to the signal receiving end of the controller. The control output end of the controller is electrically connected to the electrical control end of the hydraulic rod (301). The controller can be detachably installed on the conveyor (101).

10. A precision coating process for high-adhesion lithium battery electrode ceramic coating, characterized in that, The high-adhesion lithium battery electrode ceramic coating precision coating apparatus according to any one of claims 1 to 9 is used, comprising the following steps: S1. Slurry preparation and feeding: By weight percentage, mix 30-50% ceramic powder, 2-6% binder, and 0.5-2% dispersant, with the remainder being solvent, to prepare ceramic coating slurry. After high-speed dispersion and sand milling, the slurry fineness is ≤0.2μm. The prepared slurry is then fed into the connecting pipe (205) through the liquid inlet (206) to complete the feeding preparation before coating. S2, Electrode conveying and synchronous linkage: The lithium battery electrode is laid flat on the conveyor (101) and the conveyor is started. When the conveyor (101) is running, the first gear (107) and the second gear (106) mesh and drive the transmission column (114) to drive the roller belt (115) to run synchronously with the conveyor (101). The electrode is conveyed with the conveyor (101) to the coating operation position below the coating nozzle. S3, Reciprocating precision coating: When the transmission column (114) is running, it synchronously drives the first bevel gear (204) and the second bevel gear (202) to mesh and rotate. The second bevel gear (202) pulls the connecting pipe (205) to slide back and forth in the extension frame (109) through the traction rod (203) at its eccentric position. This causes the connecting pipe (205) to drive the coating nozzle on its lower surface to move back and forth synchronously, so that the ceramic slurry is evenly sprayed onto the surface of the electrode to form the initial layer of ceramic coating. S4, Hydraulic precision rolling: After the electrode coating is completed, it is conveyed by the conveyor (101) to the rolling operation position below the rolling belt (115). The hydraulic rod (301) on the H-shaped frame (103) is started. The piston rod of the hydraulic rod (301) pushes the U-shaped rod (305) downward, which drives the second square bearing (303) to move down in the second guide frame (302). This causes the roller (304) to move down along the longitudinal strip (117) and roll to contact the lower surface of the inner ring of the rolling belt (115). The rolling pressure is transmitted to the ceramic coating surface of the electrode through the rolling belt (115). S5, Pressure closed-loop control: During the pushing process of the hydraulic rod (301), its piston rod is simultaneously pressed against the pressure sensor (306) on the lower surface of the U-shaped rod (305). The pressure sensor (306) transmits the detected pressure signal to the controller. The controller adjusts the piston rod extension of the hydraulic rod (301) in real time according to the preset roller pressure threshold, so as to realize the closed-loop precise control of the roller pressure. Through the cooperation of the roller (304) and the roller belt (115), the ceramic coating on the electrode surface is subjected to roller densification treatment. S6. Elastic tension adaptation: During the rolling process, when the roller (304) presses against the lower surface of the inner ring of the roller pressing belt (115), the roller pressing belt (115) being pushed will drive the first square bearing (111) and the connecting rod (112) to slide and retract in the first guide frame (110) and compress the spring (113) through the shaft of the transmission column (114) at one end, forming an elastic tension force, so that the roller pressing belt (115) always remains in a taut state and is tightly attached to the surface of the electrode, which will offset the rigid impact generated by the roller (304) pressing and avoid the roller pressing belt (115) from loosening and the electrode coating from being damaged or uneven in thickness due to uneven pressure.

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