Coating device for negative electrode of lithium battery

Abstract

The invention provides a coating device for a negative electrode of a lithium battery. The coating device comprises a machine body, a conveying assembly and a coating assembly, wherein the conveying assembly and the coating assembly are arranged on the machine body; the coating assembly comprises a plurality of coating units arranged side by side, and each coating unit is provided with a coating frame used for containing slurry and a discharging opening located in the bottom of the coating frame. The coating frame is formed by oppositely splicing a first movable side plate and a second movable side plate in the coating width direction. The device further comprises an overall driving mechanism and a selection driving mechanism. The integral driving mechanism is in transmission connection with the first movable side plates of all the coating units and is used for driving all the first movable side plates to move synchronously; and the selection driving mechanism is selectively in transmission connection with the second movable side plates of all the coating units and used for driving the selected part of the second movable side plates to move, and the contradiction that overall adjustment is not flexible, independent adjustment is not synchronous, and efficiency is low is avoided.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production technology, and in particular to a coating apparatus for the negative electrode of a lithium battery. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, the preparation of the negative electrode is one of the key steps, which typically requires uniformly coating a slurry-like negative electrode active material onto a metal current collector (such as copper foil). The uniformity and consistency of the coating process directly affect the electrochemical performance and safety of the battery.

[0003] In existing coating equipment, a multi-channel parallel coating technology is often used to improve production efficiency. This involves setting up multiple parallel coating heads (or coating frames) on one machine to simultaneously apply multiple strips of coating to a wide current collector. The width of each coating strip (i.e., the coating width) needs to be precisely set and adjusted according to the design requirements of the battery model.

[0004] Currently, there are two main technical approaches to adjusting the coating width of multi-channel coating machines: one is overall linkage adjustment, which uses a single drive mechanism to synchronously adjust the same side baffle of all coating units to achieve equal increases or decreases in the width of all coating strips; the other is independent adjustment, which equips each coating unit with an independent drive mechanism (such as a micro motor or manual knob) to adjust its width individually.

[0005] However, all of the above-mentioned existing technical solutions have obvious drawbacks: While the overall linkage adjustment scheme is simple to operate and can ensure that all coating strips have the same width, it lacks flexibility. When the production task only requires changing the width of some coating strips (for example, producing asymmetrical electrode designs to adapt to special battery models), or when compensatory fine-tuning is needed to compensate for wear of individual coating units, this scheme cannot be implemented, thus limiting the production adaptability of the equipment.

[0006] Therefore, there is an urgent need in the field for a coating width adjustment device that can balance adjustment efficiency and adjustment flexibility, which can meet the production needs of adjusting all coating widths at once, and can also conveniently realize individual or group width adjustment for some coating units. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a coating apparatus for the negative electrode of a lithium battery, thereby resolving these issues.

[0008] On one hand, the present invention provides a coating apparatus for a lithium battery negative electrode, comprising a body, a conveying assembly and a coating assembly disposed on the body; The coating assembly includes multiple coating units arranged side by side, each coating unit having a coating frame for receiving slurry and a discharge port located at its bottom; The coating frame is formed by splicing a first movable side plate and a second movable side plate together along the coating width direction; The device also includes an overall drive mechanism and a selective drive mechanism; The overall drive mechanism is connected to the first movable side plate of all coating units and is used to drive all the first movable side plates to move synchronously so as to uniformly adjust the coating width of all coating frames. The selection drive mechanism is selectively connected to the second movable side plate of all coating units, and is used to drive the selected portion of the second movable side plate to move, so as to adjust the coating width of the corresponding coating frame individually or in groups.

[0009] Compared with existing technologies, the advantages of this invention are: by setting up independent overall drive mechanisms and selective drive mechanisms, the contradiction between the inflexibility of overall adjustment and the asynchronous and inefficient independent adjustment in existing technologies is perfectly resolved. When it is necessary to uniformly change the specifications of all coating strips, the overall drive mechanism can be used to synchronously and steplessly adjust all first movable side plates with one click, making the operation extremely simple and efficient, and ensuring the consistency of all coating widths. When only some coating strips need to be adjusted (such as when producing batteries of special specifications or performing local compensation), the selective drive mechanism can be activated to precisely drive only the target second movable side plate without affecting other units, giving the equipment extremely high process adaptability and production flexibility.

[0010] Furthermore, the overall driving mechanism includes a first driving screw arranged along the coating width direction, a plurality of first sliders threadedly engaged with the first driving screw, and a linkage connecting all the first sliders, each of the first sliders corresponding to a first movable side plate; the linkage is configured such that when the first driving screw rotates, it drives all the first sliders to move synchronously in the same direction, and drives all the first movable side plates to move synchronously through the first sliders.

[0011] Furthermore, the linkage is a retractable rhomboid hinge assembly, which includes multiple rhomboid units that are hinged sequentially; each rhomboid unit is formed by four connecting rods, and a pair of opposite hinge points are respectively connected to two adjacent first sliders.

[0012] Furthermore, the selection drive mechanism includes a drive assembly and multiple selection execution units; the drive assembly is disposed on the body and can move along the coating width direction; each selection execution unit is correspondingly connected to a second movable side plate and can selectively engage or disengage from the drive assembly; when the selection execution unit is engaged with the drive assembly, the movement of the drive assembly can drive the selection execution unit and its connected second movable side plate to move; when the selection execution unit is disengaged from the drive assembly, the movement of the drive assembly does not affect the position of the selection execution unit and its connected second movable side plate.

[0013] Furthermore, the drive assembly includes a second drive screw, a drive slide that is threadedly engaged with the second drive screw, and a drive rod connected to the drive slide, the drive rod extending in a direction parallel to the second drive screw.

[0014] Furthermore, each of the selected execution units includes: The mounting base is sleeved on the drive rod and can slide along it; A locking element is movably mounted on the mounting base and has a locked position and a released position; when in the locked position, the locking element fixes the mounting base and the drive rod relative to each other; when in the released position, the mounting base and the drive rod can slide relative to each other. The connector has one end connected to the locking member or mounting base, and the other end connected to the corresponding second movable side plate.

[0015] Furthermore, the locking member includes a movable rod that movably passes through the mounting base, a pressing part disposed at one end of the movable rod, and an operating part disposed at the other end of the movable rod; the mounting base is provided with a channel that cooperates with the drive rod; by operating the operating part, the movable rod can be moved axially, so that the pressing part presses or releases the drive rod, thereby realizing the switching of the locking member between the locked position and the released position; The operating part includes a bolt threadedly connected to the mounting base, and a connecting plate is fixedly provided on the movable rod. The connecting plate has a threaded hole. The bolt engages with the threaded hole, and turning the bolt can drive the movable rod to move axially. Furthermore, the conveying assembly includes an unwinding roller disposed at one end of the machine body, a take-up roller disposed at the other end, and a motor for driving the take-up roller. The negative electrode sheet to be coated is conveyed between the unwinding roller and the take-up roller and passes under the coating assembly.

[0016] Furthermore, the machine body is also provided with a stirring assembly; the stirring assembly includes a transmission component disposed on the machine body, a transmission rod connected to the transmission component, and a plurality of stirring rods connected to the transmission rod via a conversion component; the transmission rod is disposed above all the coating frames, and each of the stirring rods extends into the corresponding coating frame; the transmission component is driven by an auxiliary roller in the conveying assembly.

[0017] Furthermore, the machine body is also provided with auxiliary components; the auxiliary components include a sorting plate and a cleaning brush disposed on the feeding side of the coating component; the sorting plate is used to flatten the negative electrode sheet to be coated during the conveying process, and the cleaning brush is used to remove impurities from the surface of the negative electrode sheet. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the coating device for the negative electrode of a lithium battery according to the present invention.

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the organism.

[0020] Figure 3 This is an assembly perspective view of the coating component, the overall drive mechanism, and the selective drive mechanism.

[0021] Figure 4 A three-dimensional structural diagram of the overall drive mechanism mounted on the machine body (outer cover hidden).

[0022] Figure 5 A three-dimensional structural schematic diagram of the overall drive mechanism from one perspective.

[0023] Figure 6 This is a three-dimensional structural schematic diagram of the overall drive mechanism from another perspective.

[0024] Figure 7 This is a three-dimensional structural diagram of the selected drive mechanism.

[0025] Figure 8 This is a three-dimensional schematic diagram of a portion of the coating component structure.

[0026] Figure 9 An exploded three-dimensional view of the drive assembly in the selected drive mechanism.

[0027] Figure 10 An exploded 3D view of the selected actuator in the selected drive mechanism.

[0028] Figure 11 This is a three-dimensional structural diagram of the stirring assembly.

[0029] Figure 12 This is a partial three-dimensional structural diagram of the coating assembly and the mixing assembly.

[0030] Figure 13 This is a three-dimensional structural diagram of the auxiliary component.

[0031] Explanation of reference numerals in the attached drawings: 10. Machine body; 20. Conveying assembly; 21. Unwinding roller; 22. Rewinding roller; 23. Motor; 24. Auxiliary roller; 30. Coating assembly; 31. Coating frame; 311. First movable side plate; 312. Second movable side plate; 313. Whole plate; 314. Second slider; 315. Slide rail; 32. Discharge port; 33. Feed pipe; 40. Overall drive mechanism; 41. First drive screw; 42. First slider; 43. Linkage component; 50. Selection drive mechanism; 51. Drive assembly; 511. Second... 512. Drive screw; 513. Drive rod; 52. Selector actuator; 521. Mounting base; 522. Locking element; 5221. Movable rod; 5222. Extrusion part; 5223. Operating part; 5224. Channel; 5225. Bolt; 5226. Connecting plate; 5227. Threaded hole; 523. Connector; 60. Stirring assembly; 61. Transmission component; 62. Transmission rod; 63. Conversion component; 64. Stirring rod; 70. Auxiliary assembly; 71. Finishing plate; 72. Cleaning brush; 80. Negative electrode sheet.

[0032] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0034] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] like Figures 1 to 3 As shown, the present invention provides a coating device for a lithium battery negative electrode, which mainly includes a body 10, a conveying component 20 disposed on the body 10, and a coating component 30. The coating assembly 30 includes a plurality of coating units arranged side by side, each of the coating units having a coating frame 31 for receiving slurry and a discharge port 32 located at its bottom; The coating frame 31 is formed by splicing the first movable side plate 311 and the second movable side plate 312 together along the coating width direction; The device also includes an overall drive mechanism 40 and a selective drive mechanism 50; The overall drive mechanism 40 is connected to the first movable side plate 311 of all coating units and is used to drive all the first movable side plates 311 to move synchronously so as to uniformly adjust the coating width of all coating frames 31. The selection drive mechanism 50 is selectively connected to the second movable side plate 312 of all coating units, and is used to drive the selected portion of the second movable side plate 312 to move, so as to adjust the coating width of the corresponding coating frame 31 individually or in groups.

[0037] It is worth noting that by setting up independent overall drive mechanism 40 and selective drive mechanism 50, the contradiction between inflexible overall adjustment and asynchronous, inefficient independent adjustment in the prior art is perfectly resolved. When it is necessary to uniformly change the specifications of all coating strips, the overall drive mechanism 40 can be used to synchronously and steplessly adjust all first movable side plates 311 with one click, making the operation extremely simple and efficient, and ensuring the consistency of all coating widths. When only some coating strips need to be adjusted (such as when producing batteries of special specifications or performing local compensation), the selective drive mechanism 50 can be activated to precisely drive only the target second movable side plate 312 without affecting other units, giving the equipment extremely high process adaptability and production flexibility.

[0038] In this embodiment, the coating assembly 30 is the core functional component. It includes multiple coating units arranged side by side. Each coating unit has a coating frame 31 with a top opening for receiving the negative electrode slurry (binder), and the coating unit is also provided with a feed pipe 33. The bottom of the coating frame 31 has a narrow discharge port 32, from which the slurry flows out under gravity or pressure and coats the negative electrode sheet 80 passing below. Crucially, the width of each coating frame 31 is adjustable, and it is formed by splicing a first movable side plate 311, a second movable side plate 312, and a single plate 313. By adjusting the gap between the first movable side plate 311 and the second movable side plate 312, the width of each slurry coating layer applied to the negative electrode sheet 80 can be precisely controlled. The plate 313 has a slide rail 315, and the second movable side plate 312 has a second slider 314 extending from it. The second slider 314 is adapted to the slide rail 315 and is used to guide the movement of the second movable side plate 312.

[0039] Specifically, the overall drive mechanism 40 includes a first drive screw 41 arranged along the coating width direction, a plurality of first sliders 42 threadedly engaged with the first drive screw 41, and a linkage 43 connecting all the first sliders 42. Each first slider 42 is connected to a first movable side plate 311. The linkage 43 is configured to drive all the first sliders 42 to move synchronously in the same direction when the first drive screw 41 rotates, and drive all the first movable side plates 311 to move synchronously through the first sliders 42.

[0040] More specifically, the linkage 43 is a retractable rhomboid hinge assembly, which includes multiple rhomboid units that are hinged sequentially; each rhomboid unit is formed by four connecting rods, and a pair of opposite hinge points are respectively connected to two adjacent first sliders 42.

[0041] In this embodiment, in order to achieve uniform and synchronous adjustment of the width of all coating strips, the present invention provides an overall drive mechanism 40.

[0042] like Figures 4 to 6 As shown, the overall drive mechanism 40 is connected to the first movable side plate 311 of all coating units. Its specific structure includes: a first drive screw 41 horizontally mounted on the machine body 10 along the coating width direction (X direction). Multiple first sliders 42 are threaded onto the first drive screw 41, the number of which matches the number of coating units, and each first slider 42 is fixedly connected to the corresponding first movable side plate 311.

[0043] To ensure that all first sliders 42 move in perfect sync when the lead screw rotates (rather than being out of sync due to thread clearance or other reasons), a linkage 43 is provided connecting all the first sliders 42. In this preferred embodiment, the linkage 43 is a retractable rhomboid hinge assembly. It is formed by multiple rhomboid units hinged sequentially, each rhomboid unit being formed by four short connecting rods hinged together. Adjacent first sliders 42 are connected to a pair of opposite hinge points of the same rhomboid unit. When the operator rotates the first drive lead screw 41 via the handwheel, all first sliders 42 are forced to move synchronously along the lead screw axis (X direction). For example, when the lead screw rotates clockwise, all first sliders 42 move to the left simultaneously, driving all first movable side plates 311 to move synchronously to the left via the first connecting rod. Since the position of the second movable side plate 312 is locked by the selection drive mechanism 50 at this time (see below), the width of all coating frames 31 is reduced by an equal amount. Rotating the lead screw in the opposite direction increases all widths by an equal amount. The entire process is completed in one operation, which is efficient and consistent in precision.

[0044] Specifically, the selection drive mechanism 50 includes a drive assembly 51 and a plurality of selection execution units 52; the drive assembly 51 is disposed on the body 10 and can move along the coating width direction; each selection execution unit 52 is correspondingly connected to a second movable side plate 312 and can selectively engage or disengage from the drive assembly 51; when the selection execution unit 52 is engaged with the drive assembly 51, the movement of the drive assembly 51 can drive the selection execution unit 52 and its connected second movable side plate 312 to move; when the selection execution unit 52 is disengaged from the drive assembly 51, the movement of the drive assembly 51 does not affect the position of the selection execution unit 52 and its connected second movable side plate 312.

[0045] Specifically, the drive assembly 51 includes a second drive screw 511, a drive slide 512 threadedly engaged with the second drive screw 511, and a drive rod 513 connected to the drive slide 512, the drive rod 513 extending in a direction parallel to the second drive screw 511.

[0046] Specifically, each of the selection execution units 52 includes: Mounting base 521, which is sleeved on the drive rod 513 and can slide along it; The locking member 522 is movably disposed on the mounting base 521 and has a locked position and a released position; when it is in the locked position, the locking member 522 fixes the mounting base 521 and the drive rod 513 relative to each other; when it is in the released position, the mounting base 521 and the drive rod 513 can slide relative to each other. The connector 523 has one end connected to the locking member 522 or the mounting base 521, and the other end connected to the corresponding second movable side plate 312.

[0047] Specifically, the locking member 522 includes a movable rod 5221 that movably passes through the mounting base 521, a pressing part 5222 disposed at one end of the movable rod 5221, and an operating part 5223 disposed at the other end of the movable rod 5221; the mounting base 521 is provided with a channel 5224 that cooperates with the drive rod 513; by operating the operating part 5223, the movable rod 5221 can be moved axially, so that the pressing part 5222 presses or releases the drive rod 513, thereby realizing the switching of the locking member 522 between the locked position and the released position; The operating part 5223 includes a bolt 5225 that is threadedly connected to the mounting base 521. A connecting plate 5226 is fixedly provided on the movable rod 5221. A threaded hole 5227 is provided on the connecting plate 5226. The bolt 5225 cooperates with the threaded hole 5227. Tightening the bolt 5225 can drive the movable rod 5221 to move axially. In this embodiment, in order to achieve individual adjustment of the width of a portion of the coating strip, the present invention provides a selection drive mechanism 50 independent of the overall drive mechanism 40.

[0048] like Figures 7 to 10 As shown, the selection drive mechanism 50 is selectively connected to the second movable side plate 312 of all coating units. It includes a drive assembly 51 movable in the X direction and a plurality of selection execution units 52 corresponding one-to-one with each coating unit.

[0049] The drive assembly 51 includes: a second drive screw 511 horizontally mounted on the body 10 and parallel to the first drive screw 41. A drive slide 512 is threaded onto the second drive screw 511. A long, straight drive rod 513 is fixedly connected to the drive slide 512 by a bracket and extends parallel to the second drive screw 511.

[0050] Each of the selected execution units 52 is connected to a second movable side plate 312. Its core function is to selectively engage or disengage the common drive lever 513.

[0051] Select the working principle of drive mechanism 50: Engaged (locked) state: When it is necessary to adjust the width of a coating unit, the selection execution unit 52 corresponding to that unit is placed in the engaged state. The operation method is as follows: Use a wrench or other tools to tighten the bolt 5225. Since the head of the bolt 5225 abuts against the connecting plate 5226 and the threaded part is screwed into the mounting base 521, the tightening process will pull the movable rod 5221 to move inward into the mounting base 521, thereby causing the extrusion part 5222 to press tightly against the drive rod 513, generating a huge frictional force, and firmly locking the mounting base 521 in the current position of the drive rod 513.

[0052] Separation (Release) State: When it is not necessary to adjust a certain coating unit, the corresponding selection execution unit 52 is placed in the separation state. The operation method is as follows: loosen the bolt 5225, drive the movable rod 5221 back, the extrusion part 5222 disengages from the drive rod 513, and the mounting base 521 can then slide freely on the drive rod 513.

[0053] Select adjustment operation: Assume only adjustment is needed. Figure 7 The widths of the first and third coating units from left to right are shown. First, the selection execution units 52 corresponding to these two units are placed in the engaged state, while the selection execution units 52 corresponding to the second and fourth units are placed in the disengaged state. Then, the handwheel of the second drive screw 511 is rotated, driving the slide block 512 to move the drive rod 513 along the X direction. At this time, the first and third mounting seats 521 in the engaged state are dragged together by the drive rod 513, driving the second movable side plate 312 connected to them to move through the connector 523, thereby changing the width of the corresponding coating frame 31. The second, fourth, and fifth mounting seats 521 in the disengaged state will passively slide freely on the drive rod 513, their positions remain unchanged, so the width of the second movable side plate 312 connected to them and the corresponding coating frame 31 also remain unchanged.

[0054] Specifically, the conveying assembly 20 includes an unwinding roller 21 disposed at one end of the machine body 10, a take-up roller 22 disposed at the other end, and a motor 23 for driving the take-up roller 22. The negative electrode sheet 80 to be coated is conveyed between the unwinding roller 21 and the take-up roller 22 and passes under the coating assembly 30.

[0055] In this embodiment, the machine body 10 serves as the support frame for the device. The conveying assembly 20 is mounted on the machine body 10 and is used to convey the negative electrode sheet 80 (typically a roll of copper foil) to be coated. Specifically, the negative electrode sheet 80 is drawn out from the unwinding roller 21, passes horizontally under the coating assembly 30, and is finally collected by the take-up roller 22, forming a continuous coating production process.

[0056] like Figure 11 and Figure 12As shown, the machine body 10 is also provided with a stirring assembly 60; the stirring assembly 60 includes a transmission component 61 disposed on the machine body 10, a transmission rod 62 connected to the transmission component 61, and a plurality of stirring rods 64 connected to the transmission rod 62 through a conversion component 63; the transmission rod 62 is disposed above all the coating frames 31, and each stirring rod 64 extends into the corresponding coating frame 31; the transmission component 61 is driven by the auxiliary roller 24 in the conveying assembly 20.

[0057] like Figure 13 As shown, specifically, the machine body 10 is also provided with an auxiliary component 70; the auxiliary component 70 includes a sorting plate 71 and a cleaning brush 72 disposed on the feeding side of the coating component 30; the sorting plate 71 is used to flatten the negative electrode sheet 80 to be coated during the conveying process, and the cleaning brush 72 is used to remove impurities from the surface of the negative electrode sheet 80.

[0058] To prevent uneven distribution of the slurry within the coating frames 31, a stirring assembly 60 is installed on the machine body 10. This assembly includes a transmission component 61 (pulley and belt) driven by an auxiliary roller 24 of the conveying assembly 20. The transmission component 61 drives a transmission rod 62 that spans across all the coating frames 31. A vertical stirring rod 64 is connected to the transmission rod 62 at the position corresponding to each coating frame 31 via a conversion component 63 (such as a bevel gear). The lower end of the stirring rod 64 extends into the slurry within the coating frame 31. During operation, the stirring rod 64 continuously rotates, stirring the slurry and maintaining its uniformity.

[0059] An auxiliary component 70 is installed on the feed side of the coating assembly 30 (i.e., before the negative electrode sheet 80 enters the coating area). A sorting plate 71 is used to flatten the conveyed negative electrode sheet 80 and eliminate wrinkles. A cleaning brush 72 is used to brush away dust, metal shavings, and other impurities adsorbed by static electricity on the surface of the negative electrode sheet 80, ensuring that the coating substrate is clean.

[0060] The working principle and workflow of the coating device are as follows: The rolled negative electrode sheet 80 (such as copper foil) to be coated is installed on the unwinding roller 21 at one end of the machine body 10, and the head of the sheet is pulled through the auxiliary component 70 and the coating component 30 in sequence, and finally fixed to the take-up roller 22 at the other end.

[0061] All locking elements 522 of the selection execution unit 52 are in the released (disengaged) state. At this time, the positions of each second movable side plate 312 are independent and not linked with the selection drive mechanism 50. The operator turns the handwheel of the first drive screw 41. The rotation of the first drive screw 41 forces all first sliders 42 to move strictly synchronously along the screw axis through the forced constraint of the diamond hinge linkage 43. All first sliders 42 drive all first movable side plates 311 to move synchronously. Since the second movable side plates 312 are temporarily fixed, the width of all coating frames 31 is changed by an equal amount and in the same direction.

[0062] When production tasks require a difference between the width of some coating strips and the baseline value (such as when producing asymmetric electrodes or performing process compensation): The operator only switches the selection execution unit 52 corresponding to the coating unit whose width needs to be changed to the locked (engaged) state (so that the extrusion part 5222 grips the common drive rod 513). The remaining units that do not need to be adjusted remain in the released state.

[0063] Rotating the handwheel of the second drive screw 511 drives the slide block 512 to move the drive rod 513 axially. In the locked state, the mounting base 521 of the selection execution unit 52 is forcibly dragged because it is fixed to the drive rod 513, thereby moving the corresponding second movable side plate 312 via the connecting rod, thus changing the width of the coating frame 31. In the released state, the mounting base 521 of the selection execution unit 52 slides freely on the drive rod 513, its position unaffected, and the width of the connected second movable side plate 312 and the coating frame 31 remains unchanged.

[0064] The take-up roller 22 motor 23 is started, and the sheet begins to move at a set speed. Simultaneously, the stirring assembly 60 is activated, driving the stirring rods 64 within each coating frame 31 to rotate, continuously stirring the slurry to prevent sedimentation and maintain uniformity. The moving sheet (negative electrode 80) first passes through the auxiliary assembly 70, where the sorting plate 71 flattens it and eliminates wrinkles; the cleaning brush 72 removes surface dust, debris, and other impurities, ensuring a clean and smooth coating surface. The processed negative electrode 80 enters the coating area, and the slurry within each coating frame 31 flows out from its bottom discharge port 32 under gravity, forming wet coating strips on the surface of the passing negative electrode 80. The width of the coating is precisely controlled by the gap between the first and second movable side plates 312 of the corresponding coating frame 31.

[0065] Stop the winding motor 23 and the stirring power source to complete the coating of the current coiled electrode.

[0066] Repeat the above process when you need to change the product model.

[0067] In summary, the technical effects of implementing this technical solution are as follows: By setting up independent overall drive mechanism 40 and selective drive mechanism 50, the contradiction between inflexible overall adjustment and asynchronous, inefficient independent adjustment in the prior art is perfectly resolved. When it is necessary to uniformly change the specifications of all coating strips, the overall drive mechanism 40 can be used to synchronously and steplessly adjust all first movable side plates 311 with one click, making the operation extremely simple and efficient, and ensuring the consistency of all coating widths. When only some coating strips need to be adjusted (such as when producing batteries of special specifications or performing local compensation), the selective drive mechanism 50 can be activated to precisely drive only the target second movable side plate 312 without affecting other units, giving the equipment extremely high process adaptability and production flexibility.

[0068] The mechanical transmission method employing the first drive screw 41 in conjunction with the linkage component 43 (especially the diamond hinge assembly) allows for the forced and uniform synchronous movement of all first sliders 42 and first movable side plates 311 through a single power input. This purely mechanical, hard-connection method, compared to the electronically controlled synchronization scheme driven by multiple motors 23, eliminates accumulated errors and response delays, resulting in higher synchronization accuracy, stronger anti-interference capabilities, lower cost, and superior reliability.

[0069] The selection drive mechanism 50, through its architecture of "drive assembly 51 + selection execution unit 52," particularly employs a mechanical selection execution unit 52 with a switchable locking element 522, providing a simple, low-cost, and reliable "engagement / disengagement" mechanism. Operators can quickly and intuitively connect or disconnect a coating unit from the common drive assembly 51 through simple mechanical operations (such as tightening or loosening bolts 5225), ensuring that in "selection adjustment" mode, power is only transmitted to the selected unit, while the positions of unselected units are securely locked without any risk of drift.

[0070] The mixing assembly 60 is driven by the equipment's own power, eliminating the need for an additional independent motor 23. This allows for continuous mixing of the slurry within each coating frame 31, effectively preventing slurry settling and skinning, and ensuring slurry uniformity and consistent coating quality. The finishing plate 71 and cleaning brush 72 in the auxiliary assembly 70 can level and clean the substrate before coating, removing physical defects and impurities that affect coating quality. This further improves the uniformity, consistency, and yield of the final coated electrode sheets, forming a more complete and automated coating system.

[0071] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A coating device for a lithium battery negative electrode, characterized by, The device comprises a machine body, a conveying assembly arranged on the machine body, and a coating assembly; the coating assembly comprises a plurality of coating units arranged side by side, each of the coating units has a coating frame for accommodating slurry and a discharging port at the bottom of the coating frame; the coating frame is formed by relatively splicing a first movable side plate and a second movable side plate along the coating width direction; The device further comprises an overall driving mechanism and a selective driving mechanism; the overall driving mechanism is in driving connection with the first movable side plates of all the coating units, and is used to drive the first movable side plates to move synchronously so as to uniformly adjust the coating widths of all the coating frames; the selective driving mechanism is selectively in driving connection with the second movable side plates of all the coating units, and is used to drive the selected second movable side plates to move so as to adjust the coating widths of the corresponding coating frames individually or in groups.

2. The coating apparatus for a lithium battery negative electrode according to claim 1, wherein The overall driving mechanism comprises a first driving lead screw arranged along the coating width direction, a plurality of first sliding blocks in thread cooperation with the first driving lead screw, and a linkage connecting all the first sliding blocks, each of the first sliding blocks is correspondingly connected with one of the first movable side plates; the linkage is configured to drive all the first sliding blocks to move synchronously in the same direction when the first driving lead screw rotates, and drive all the first movable side plates to move synchronously through the first sliding blocks.

3. The coating apparatus for a lithium battery negative electrode according to claim 2, wherein The linkage is a telescopic rhombic hinge assembly, which comprises a plurality of rhombic hinge units connected in sequence; each of the rhombic hinge units is formed by four connecting rods, and one pair of opposite hinge points are respectively connected to two adjacent first sliding blocks.

4. The coating apparatus for a lithium battery anode according to claim 1, wherein The selective driving mechanism comprises a driving assembly and a plurality of selective execution units; the driving assembly is arranged on the machine body and can move along the coating width direction; each of the selective execution units is correspondingly connected with one of the second movable side plates, and can be selectively engaged with or separated from the driving assembly; when the selective execution unit is engaged with the driving assembly, the movement of the driving assembly can drive the selective execution unit and the second movable side plate connected therewith to move; when the selective execution unit is separated from the driving assembly, the movement of the driving assembly does not affect the position of the selective execution unit and the second movable side plate connected therewith.

5. The coating apparatus for a lithium battery negative electrode according to claim 4, wherein The driving assembly comprises a second driving lead screw, a driving sliding block in thread cooperation with the second driving lead screw, and a driving rod connected to the driving sliding block, the driving rod extends along a direction parallel to the second driving lead screw.

6. The coating device for lithium battery negative electrode according to claim 5, wherein, Each of the selective execution units comprises: a mounting seat sleeved on the driving rod and capable of sliding thereon; a locking member movably arranged on the mounting seat, having a locking position and a releasing position; when being at the locking position, the locking member relatively fixes the mounting seat and the driving rod; when being at the releasing position, the mounting seat and the driving rod are relatively slidable; a connecting member having one end connected with the locking member or the mounting seat and the other end connected with the corresponding second movable side plate.

7. The coating apparatus for a lithium battery negative electrode according to claim 6, wherein The locking member comprises a movable rod movably arranged in the mounting seat, a pressing portion arranged at one end of the movable rod, and an operating portion arranged at the other end of the movable rod; the mounting seat is provided with a channel matched with the driving rod; the operating portion is operated to axially move the movable rod, so that the pressing portion presses or releases the driving rod, thereby switching the locking member between the locking position and the releasing position; The operating portion comprises a bolt threadedly connected with the mounting seat, and a connecting plate fixedly arranged on the movable rod and provided with a threaded hole; the bolt is matched with the threaded hole, and the bolt is screwed to axially move the movable rod.

8. The coating apparatus for a lithium battery anode according to claim 1, wherein The conveying assembly comprises an unwinding roller arranged at one end of the machine body, a winding roller arranged at the other end, and a motor driving the winding roller; the negative plate to be coated is conveyed between the unwinding roller and the winding roller and passes below the coating assembly.

9. The coating apparatus for a lithium battery anode according to claim 1, wherein The machine body is further provided with a stirring assembly; the stirring assembly comprises a transmission member arranged on the machine body, a transmission rod connected with the transmission member, and a plurality of stirring rods connected with the transmission rod through a conversion member; the transmission rod is arranged above all the coating frames, and each stirring rod extends into the corresponding coating frame; the transmission member is driven by an auxiliary roller in the conveying assembly.

10. The coating apparatus for a lithium battery anode according to claim 1, wherein The machine body is further provided with an auxiliary assembly; the auxiliary assembly comprises a arranging plate arranged at the feeding side of the coating assembly and a cleaning brush; the arranging plate is used to flatten the negative plate to be coated in conveying, and the cleaning brush is used to remove impurities on the surface of the negative plate.

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