Lithium ion battery positive and negative pole piece thickness uniformity coating machine

Abstract

The invention discloses a lithium ion battery positive and negative pole piece thickness uniformity coating machine, and relates to the technical field of lithium ion battery manufacturing equipment.The lithium ion battery positive and negative pole piece thickness uniformity coating machine comprises a mounting platform, the mounting platform is provided with a groove extending in the advancing direction of pole pieces, and the width of the groove is matched with that of the pole pieces; the coating unit is arranged above the mounting platform and is used for coating slurry on the surface of the pole piece base material penetrating through the groove; the flattening and correcting unit is arranged on the mounting platform and is positioned at the downstream of the coating unit along the advancing direction of the pole piece; the flattening and correcting unit comprises a flattening assembly used for flattening the pole piece base material and a correcting assembly used for scraping slurry to control the thickness of a coating. The pole piece coating device has the beneficial effects that the structure is compact, adjustment is visual, and the thickness uniformity, stability and production reliability of pole piece coating are effectively improved through combination of contact coating and downstream strickling and a reliable mechanical locking mechanism.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery manufacturing equipment technology, and in particular to a coating machine for uniform thickness of positive and negative electrode sheets of lithium-ion batteries. Background Technology

[0002] In the manufacturing process of lithium-ion battery electrodes, the core step is to uniformly and stably coat the active material slurry onto the metal current collector (such as aluminum foil or copper foil). The consistency of the coating thickness directly determines the battery's capacity, internal resistance, safety, and cycle life.

[0003] Currently, high-precision coating commonly employs slot extrusion coating technology, which achieves micron-level coating through precise molds and closed-loop control systems. However, this technology is extremely sensitive to the rheological properties of the slurry (such as viscosity and solid content), and places extremely high demands on mold processing precision, equipment rigidity, and control systems, resulting in expensive equipment and complex debugging and maintenance. Summary of the Invention

[0004] In view of the above-mentioned problems in the prior art, the present invention is proposed.

[0005] The purpose of this invention is to provide a coating machine for the uniform thickness of positive and negative electrode sheets of lithium-ion batteries. The aim is to solve the problems of existing high-precision coating equipment being complex in structure, high in cost, and difficult to maintain, while simple coating equipment is difficult to guarantee uniformity.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a coating machine for uniform thickness of positive and negative electrode sheets of lithium-ion batteries, comprising,

[0007] The mounting platform has grooves extending along the direction of electrode travel, and the width of the grooves matches the width of the electrode.

[0008] A coating unit, disposed above the mounting platform, is used to coat the surface of the electrode substrate passing through the groove with a slurry.

[0009] A flattening and correction unit is disposed on the mounting platform and located downstream of the coating unit along the electrode travel direction;

[0010] The flattening and correction unit includes a flattening component for flattening the electrode substrate and a correction component for scraping the slurry to control the coating thickness.

[0011] As a preferred embodiment of the lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine of the present invention, wherein: the coating unit includes:

[0012] The base is fixedly installed on the mounting platform;

[0013] A connecting arm, one end of which is rotatably connected to the base;

[0014] An electric actuator is fixedly installed on the mounting platform.

[0015] A connecting end is fixedly installed at one end of the connecting arm;

[0016] The rotating arm has its two ends rotatably connected to the telescopic end of the electric push rod and the connecting end, respectively.

[0017] The rotating rod has both ends rotatably connected to the connecting arm;

[0018] A coating roller is fixedly installed on the outer wall of the rotating rod;

[0019] A feeding assembly, installed at the connection end, is used to supply slurry to the coating roller.

[0020] As a preferred embodiment of the lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine of the present invention, the feeding assembly includes a mounting frame fixedly installed on the connecting end, a material pump fixedly installed on the mounting frame, a flow divider plate communicating with the discharge end of the material pump, and a coating sponge connected below the flow divider plate; the coating sponge is in contact with the surface of the coating roller.

[0021] The diverter plate is fixed to the bottom of the mounting bracket.

[0022] As a preferred embodiment of the lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine of the present invention, wherein: the flattening assembly includes:

[0023] The cylinder is symmetrically fixed on the mounting platform on both sides of the groove;

[0024] A connecting plate is fixedly connected to the telescopic end of the cylinder;

[0025] The slide bar slides through the connecting plate;

[0026] A connecting bracket is fixed to the bottom end of the slide rod;

[0027] The spreading plate is an L-shaped plate, which is fixed to the bottom of the connecting frame and extends into the groove; a pair of spreading plates are arranged in mirror symmetry, and the distance between them constitutes the coating width;

[0028] A spring abuts against the connecting plate and the connecting frame.

[0029] As a preferred embodiment of the lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine of the present invention, wherein: the correction component is mounted on the spreading plate and includes:

[0030] A rotating tube is rotatably mounted on the display plate;

[0031] A scraper is fixedly connected to the rotating tube;

[0032] Gears are fixedly connected to both ends of the rotating tube;

[0033] An angle adjustment assembly includes a motor fixedly mounted on the unfolding plate and a transmission gear mounted on its output end. The transmission gear meshes with the gear at one end and is used to drive the rotating tube to rotate in order to adjust the scraper angle.

[0034] The locking assembly includes a linear servo fixedly mounted on the flat plate and a locking block mounted on its output end. The linear servo can drive the locking block to move horizontally to engage with the gear at the other end to achieve angle locking.

[0035] As a preferred embodiment of the lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine of the present invention, wherein: the angle adjustment component further includes a heightening seat fixed on the unfolding plate for mounting the motor.

[0036] As a preferred embodiment of the lithium-ion battery positive and negative electrode uniformity coating machine of the present invention, wherein: the flattening and correction unit is located downstream of the coating unit along the electrode traveling direction, and is used to flatten and fix the thickness of the coated wet coating.

[0037] As a preferred embodiment of the lithium-ion battery positive and negative electrode uniformity coating machine of the present invention, wherein: when the cylinder extends, it can raise the spreading plate to provide space for the electrode substrate to pass through.

[0038] The beneficial effects of the lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine of the present invention are as follows:

[0039] 1. The substrate flattening and coating leveling and thickness fixing functions are integrated into the flattening and correction unit. The correction component is directly installed on the flattening component, which simplifies the equipment layout and reduces the space occupied and the complexity of the mechanism.

[0040] 2. By using "contact roller coating + downstream mechanical leveling", the coating unit first feeds the material, and then the wet coating is finally leveled and fixed in thickness by a precisely adjustable and lockable scraper, which effectively improves the uniformity of thickness from the process principle.

[0041] 3. The coating amount can be coarsely adjusted by adjusting the roller pressure with an electric push rod, and the coating thickness can be finely adjusted by driving the scraper angle with a motor. The adjustment process is all mechanical, intuitive and easy to understand, reducing the technical threshold for operators.

[0042] 4. The L-shaped flat plate, which provides initial pressure from a cylinder and elastic clamping force from a spring, can flexibly and continuously flatten the electrode substrate from both sides, effectively eliminating wrinkles and minimizing damage to the thin foil.

[0043] 5. The scraper angle of the correction component is fixed by a mechanical method of gear meshing and locking block, which has strong anti-vibration ability and ensures the long-term stability of the scraper angle (i.e. coating thickness) during continuous production.

[0044] In summary, the present invention has a compact structure and intuitive adjustment. Through the combination of contact coating and downstream leveling, as well as a reliable mechanical locking mechanism, it effectively improves the thickness uniformity, stability and production reliability of electrode coating. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of the present invention.

[0047] Figure 2 This is a schematic diagram of the electric actuator in this invention.

[0048] Figure 3 This is a schematic diagram of the feeding assembly in this invention.

[0049] Figure 4 This is a schematic diagram of the flattening component in this invention.

[0050] Figure 5 This is a schematic diagram of the locking component in this invention.

[0051] Figure 6 This is a schematic diagram of the angle adjustment component in this invention.

[0052] In the diagram: 100, mounting platform; 110, groove; 200, coating unit; 210, base; 220, connecting arm; 230, electric push rod; 240, connecting end; 250, rotating arm; 260, rotating rod; 270, coating roller; 280, feeding assembly; 281, mounting frame; 282, material pump; 283, flow divider; 284, coating sponge; 300, flattening and correction unit; 310, spreading... Flat assembly; 311, cylinder; 312, connecting plate; 313, slide rod; 314, connecting frame; 315, unfolding plate; 316, spring; 320, correction assembly; 321, rotating tube; 322, scraper; 323, gear; 324, angle adjustment assembly; 3241, motor; 3242, transmission gear; 3243, heightening seat; 325, locking assembly; 3251, linear servo; 3252, locking block. Detailed Implementation

[0053] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0055] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0056] Reference Figures 1 to 6 This is the first embodiment of the present invention, which provides a coating machine for uniform thickness of positive and negative electrode sheets of lithium-ion batteries, comprising,

[0057] The mounting platform 100 has a groove 110 extending along the direction of electrode travel, and the width of the groove 110 matches the width of the electrode.

[0058] It should be noted that a groove 110 extending along the direction of electrode travel is provided on the upper surface of the mounting platform 100. The width of the groove 110 is designed to match the width of the electrode to be coated, such as aluminum foil or copper foil, so as to play a preliminary guiding and limiting role and prevent the electrode from deviating during the transmission process.

[0059] The coating unit 200 is disposed above the mounting platform 100 and is used to coat the electrode substrate surface that passes through the groove 110 with slurry;

[0060] The flattening and correction unit 300 is disposed on the mounting platform 100 and is located downstream of the coating unit 200 along the electrode travel direction;

[0061] The flattening and correction unit 300 includes a flattening component 310 for flattening the electrode substrate and a correction component 320 for scraping the slurry to control the coating thickness.

[0062] like Figures 2 to 4 As shown, in one optional embodiment, the coating unit 200 includes:

[0063] The base 210 is fixedly installed on the mounting platform 100;

[0064] Connecting arm 220, one end of which is rotatably connected to base 210;

[0065] The electric push rod 230 is fixedly installed on the mounting platform 100;

[0066] The connecting end 240 is fixedly installed at one end of the connecting arm 220;

[0067] The rotating arm 250 has its two ends rotatably connected to the telescopic end and the connecting end 240 of the electric push rod 230, respectively.

[0068] The rotating rod 260 has both ends rotatably connected to the connecting arm 220;

[0069] The coating roller 270 is fixedly installed on the outer wall of the rotating rod 260;

[0070] The feeding assembly 280, mounted on the connecting end 240, is used to supply slurry to the coating roller 270.

[0071] It should be noted that the base 210 is fixed to the mounting platform 100 by bolts, one end of the connecting arm 220 is rotatably connected to the base 210, the cylinder part of the electric push rod 230 is fixed to the mounting platform 100, the connecting end 240 is welded and fixed to one end of the connecting arm 220, one end of the rotating arm 250 is rotatably connected to the piston rod (telescopic end) of the electric push rod 230, and the other end is rotatably connected to the connecting end 240. When the electric push rod 230 extends or retracts, the connecting arm 220 is driven to rotate around the base 210 through the rotating arm 250 and the connecting end 240, thereby realizing the overall lifting or lowering.

[0072] like Figure 3 As shown, in one optional embodiment: the feeding assembly 280 includes a mounting bracket 281 fixedly mounted on the connecting end 240, a material pump 282 fixedly mounted on the mounting bracket 281, a flow divider 283 communicating with the discharge end of the material pump 282, and a coating sponge 284 connected below the flow divider 283; the coating sponge 284 is in contact with the surface of the coating roller 270;

[0073] The diverter plate 283 is fixed below the mounting bracket 281.

[0074] It should be noted that the coating roller 270 is fixedly sleeved on the outer wall of the rotating rod 260 and can rotate together with the rotating rod 260. The feeding assembly 280 is responsible for continuously and evenly supplying slurry to the coating roller 270.

[0075] Specifically, the mounting bracket 281 is fixed to the connecting end 240. The material pump 282 is fixed to the upper part of the mounting bracket 281, and its inlet is connected to the slurry tank (not shown in the figure) through a hose. The diverter plate 283 is fixed to the lower part of the mounting bracket 281 and is connected to the outlet of the material pump 282 through a pipeline. The coating sponge 284 is preferably a uniform and fine sponge material, which is connected to the bottom of the diverter plate 283 through multiple diverter pipes and connected to the diverter plate 283, ensuring that its entire body is in contact with the surface of the coating roller 270 below.

[0076] During operation, the material pump 282 pumps the slurry into the distribution plate 283, and after being evenly distributed, it wets the entire coating sponge 284. The rotating coating roller 270 contacts the wet sponge and transfers the slurry to its surface. When the electrode substrate passes under the coating roller 270, the slurry is coated onto the electrode surface.

[0077] like Figure 4 As shown, in one optional embodiment, the flattening assembly 310 includes:

[0078] Cylinder 311 is symmetrically fixed on mounting platforms 100 on both sides of groove 110;

[0079] The connecting plate 312 is fixedly connected to the telescopic end of the cylinder 311;

[0080] Slide rod 313, sliding through connecting plate 312;

[0081] The connecting bracket 314 is fixed to the bottom end of the slide rod 313;

[0082] The spreading plate 315 is an L-shaped plate, which is fixed to the bottom of the connecting frame 314 and extends into the groove 110; a pair of spreading plates 315 are arranged in mirror symmetry, and the distance between them constitutes the coating width;

[0083] Spring 316 abuts between connecting plate 312 and connecting bracket 314.

[0084] It should be noted that the flattening assembly 310 is mainly used to flatten the electrode substrate laterally before or after coating. The cylinder 311 is symmetrically installed on the mounting platform 100 on both sides of the groove 110. The connecting plate 312 is fixedly connected to the piston rod (telescopic end) of the cylinder 311. The slide rod 313 is set vertically and passes through the light hole on the connecting plate 312, and can slide up and down. The connecting frame 314 is fixed to the bottom end of the slide rod 313. The flattening plate 315 is an L-shaped plate. Its vertical side is fixed to the bottom of the connecting frame 314, and its horizontal side extends inward and into the groove 110. The two flattening plates 315 are arranged in mirror symmetry. The distance between the inner sides of their horizontal sides is the target coating width. The upper end of the spring 316 abuts against the connecting plate 312, and the lower end abuts against the connecting frame 314. When cylinder 311 retracts to the working position, under the elastic force of spring 316, the L-shaped inner horizontal edges of the two unfolding plates 315 gently and continuously press against the edge of the electrode substrate from both sides, flattening it. During material feeding, cylinder 311 extends, and a nut is provided at the top of slide rod 313 to limit its movement. The nut, not shown in the figure, can overcome the spring force to lift the entire unfolding plate 315, leaving enough space for the electrode substrate to pass through.

[0085] like Figures 4 to 6 As shown, in one optional embodiment: the correction component 320 is mounted on the flat panel 315 and includes:

[0086] The rotating tube 321 is rotatably mounted on the unfolding plate 315;

[0087] Scraper 322 is fixedly connected to rotating tube 321;

[0088] Gear 323 is fixedly connected to both ends of rotating tube 321;

[0089] Angle adjustment assembly 324 includes a motor 3241 fixedly mounted on the flat plate 315, and a transmission gear 3242 mounted on its output end. The transmission gear 3242 meshes with a gear 323 at one end to drive the rotating tube 321 to rotate in order to adjust the angle of the scraper 322.

[0090] The locking assembly 325 includes a linear servo motor 3251 fixedly mounted on the flat plate 315 and a locking block 3252 mounted on its output end. The linear servo motor 3251 can drive the locking block 3252 to move horizontally so as to engage with the gear 323 at the other end to achieve angle locking.

[0091] The angle adjustment assembly 324 also includes a height-adjusting mount 3243 fixed to the flat plate 315 for mounting the motor 3241.

[0092] The flattening and correction unit 300 is located downstream of the coating unit 200 along the electrode travel direction, and is used to flatten and fix the thickness of the wet coating after coating.

[0093] When the cylinder 311 extends, it can raise the flat plate 315 to provide space for the electrode substrate to pass through.

[0094] It should be noted that the correction component 320 is directly installed on the spreading plate 315. Its core function is to smooth the slurry and set the coating thickness. The rotating tube 321 is mounted on the L-shaped spreading plate 315 by rotation. The scraper 322 (such as a stainless steel or polyurethane scraper) is welded and fixed on the rotating tube 321. Two gears 323 are respectively fixedly installed at both ends of the rotating tube 321.

[0095] The motor 3241 of the angle adjustment component 324 is fixed to the unfolding plate 315 via the riser 3243. The transmission gear 3242 on its output shaft meshes with one of the gears 323. Starting the motor 3241 drives the rotating tube 321 to rotate, thereby precisely adjusting the relative height (i.e., gap) between the bottom edge of the scraper 322 and the surface of the electrode plate. The linear servo 3251 of the locking component 325 is fixed to the unfolding plate 315, and the locking block 3252 at its output end can move horizontally under the drive of the linear servo 3251.

[0096] Once the scraper 322 is adjusted to the correct angle, the linear servo motor 3251 drives the locking block 3252 to move toward the gear 323, so that it meshes with the gear 323 at the other end of the rotating tube 321, thereby mechanically locking the angle of the rotating tube 321 (together with the scraper 322) to prevent it from shifting due to vibration or slurry resistance during operation.

[0097] Working principle:

[0098] Start the equipment, control the cylinder 311 of the flattening assembly 310 to extend, lift the flattening plate 315, guide the electrode substrate (foil) through the groove 110 of the mounting platform 100, pass under the lifted flattening plate 315 and under the coating roller 270, and connect to the downstream winding device.

[0099] The control cylinder 311 retracts, causing the spreading plate 315 to press against both sides of the electrode edge under the action of the spring 316. According to the process requirements, the downward pressure of the coating roller 270 is adjusted by the electric push rod 230 (coarse adjustment of coating amount), and the angle of the scraper 322 is finely adjusted to the predetermined height by the motor 3241 of the calibration component 320, and then locked by the linear servo motor 3251.

[0100] The material pump 282 and electrode transfer system are started, and the slurry is evenly transferred to the coating roller 270 and coated onto the surface of the moving electrode. The electrode with the wet coating then enters the downstream flattening and straightening unit 300. The electrode is first flattened by the flattening plates 315 on both sides to ensure the substrate is flat. Then the wet coating passes under the scraper 322 with a fixed angle, and the excess slurry is scraped off, thereby obtaining a coating with uniform thickness and flatness. The flattened electrode is sent to the drying system for drying to form the final battery electrode.

[0101] Importantly, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A coating machine for uniform thickness of positive and negative electrode sheets of lithium-ion batteries, characterized in that: include, The mounting platform (100) has a groove (110) extending along the direction of electrode travel, the width of which matches the width of the electrode. A coating unit (200) is disposed above the mounting platform (100) for coating a slurry onto the surface of the electrode substrate passing through the groove (110); A flattening and correction unit (300) is disposed on the mounting platform (100) and located downstream of the coating unit (200) along the electrode travel direction; The flattening and correction unit (300) includes a flattening component (310) for flattening the electrode substrate and a correction component (320) for scraping the slurry to control the coating thickness.

2. The lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine as described in claim 1, characterized in that: The coating unit (200) includes: The base (210) is fixedly installed on the mounting platform (100); A connecting arm (220) is rotatably connected at one end to the base (210); An electric push rod (230) is fixedly installed on the mounting platform (100); The connecting end (240) is fixedly installed at one end of the connecting arm (220); The rotating arm (250) has its two ends rotatably connected to the telescopic end of the electric push rod (230) and the connecting end (240), respectively; The rotating rod (260) has both ends rotatably connected to the connecting arm (220); A coating roller (270) is fixedly installed on the outer wall of the rotating rod (260); A feeding assembly (280), mounted on the connecting end (240), is used to supply slurry to the coating roller (270).

3. The lithium-ion battery positive and negative electrode sheet uniformity coating machine as described in claim 2, characterized in that: The feeding assembly (280) includes a mounting bracket (281) fixedly mounted on the connecting end (240), a material pump (282) fixedly mounted on the mounting bracket (281), a flow divider (283) communicating with the discharge end of the material pump (282), and a coating sponge (284) connected below the flow divider (283); the coating sponge (284) is in contact with the surface of the coating roller (270); The diverter plate (283) is fixed below the mounting bracket (281).

4. The lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine as described in claim 1, characterized in that: The flattening component (310) includes: The cylinder (311) is symmetrically fixed on the mounting platform (100) on both sides of the groove (110); The connecting plate (312) is fixedly connected to the telescopic end of the cylinder (311); The slide bar (313) slides through the connecting plate (312); A connecting bracket (314) is fixed to the bottom end of the slide rod (313); The spreading plate (315) is an L-shaped plate, which is fixed to the bottom of the connecting frame (314) and extends into the groove (110); a pair of spreading plates (315) are arranged in a mirror symmetrical manner, and the distance between them constitutes the coating width; A spring (316) abuts between the connecting plate (312) and the connecting frame (314).

5. The lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine as described in claim 4, characterized in that: The correction component (320) is mounted on the display plate (315) and includes: A rotating tube (321) is rotatably mounted on the unfolding plate (315); The scraper (322) is fixedly connected to the rotating tube (321); Gear (323) is fixedly connected to both ends of the rotating tube (321); Angle adjustment assembly (324) includes a motor (3241) fixedly mounted on the display plate (315) and a transmission gear (3242) mounted on its output end. The transmission gear (3242) meshes with the gear (323) at one end and is used to drive the rotating tube (321) to rotate to adjust the angle of the scraper (322). The locking assembly (325) includes a linear servo (3251) fixedly mounted on the flat plate (315) and a locking block (3252) mounted on its output end. The linear servo (3251) can drive the locking block (3252) to move horizontally to engage with the gear (323) at the other end to achieve angle locking.

6. The lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine as described in claim 5, characterized in that: The angle adjustment assembly (324) also includes a height-adjusting mount (3243) fixed to the display plate (315) for mounting the motor (3241).

7. The lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine as described in claim 1, characterized in that: The flattening and correction unit (300) is located downstream of the coating unit (200) along the electrode travel direction, and is used to flatten and fix the thickness of the wet coating after coating.

8. The lithium-ion battery positive and negative electrode sheet thickness uniformity coating machine as described in claim 4, characterized in that: When the cylinder (311) extends, it can raise the plate (315) to provide space for the electrode substrate to pass through.

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