Coating device

Abstract

The utility model relates to the technical field of coating equipment, and discloses a coating device, which comprises a coating mechanism, a coating mechanism and a coating mechanism, the coating mechanism comprises a die head, a roll shaft and a first moving component, the die head is provided with a lip, and the first moving component is in driving connection with the die head or the roll shaft so as to enable the die head and the roll shaft to be close to each other or far away from each other; and the moisturizing component is infiltrated with coating slurry, and the moisturizing component is configured to be capable of moving to abut against the lip of the die head, or the die head can be driven by a first moving assembly so that the lip of the die head can abut against the moisturizing component. According to the utility model, the lip of the die head can be wetted, slurry at the lip of the die head is prevented from being dried quickly, and the condition that the slurry is dried or agglomerated and gel occurs can be effectively relieved, so that the probability that particle scratches occur when the coating device is shut down to start coating is reduced, the quality stability of pole piece coating is ensured, and the process quality of the pole piece is improved.

Description

Technical Field

[0001] This application relates to the technical field of coating equipment, and particularly to a coating device. Background Art

[0002] In the field of new energy battery industry, the extrusion coating technology is mainly used to manufacture the electrode sheets of battery monomers. It can precisely control the slit width and coating thickness online, achieve high-precision coating, and has good film uniformity, is applicable to the coating of various substrates, can perform multi-layer coating simultaneously, improve production efficiency and flexibility, and is highly favored in the industry. However, during the operation process, when it is inevitably necessary to stop the machine for processing due to abnormal situations, at this time, the slurry in the die head has poor fluidity and is prone to agglomeration and gelation. Moreover, the volatilization of the volatile solvent in the slurry will also cause the slurry at the die head lip to dry relatively quickly, resulting in the problem that the start-up coating after the coating device stops is prone to particle scratches, affecting the thickness and appearance consistency of the electrode sheet. Summary of the Utility Model

[0003] The embodiment of this application provides a coating device, which can effectively alleviate the problem that the slurry at the die head lip dries too fast after the coating device stops, and is beneficial to reducing the risk of particle scratches.

[0004] In a first aspect, the embodiment of this application provides a coating device, including: a coating mechanism, including a die head, a roller shaft, and a first moving component. The die head is provided with a lip, and the first moving component is drivingly connected to the die head or the roller shaft to move the die head and the roller shaft closer to or away from each other; a moisturizing component, the moisturizing component is infiltrated with coating slurry, and the moisturizing component is configured to be movable to abut against the lip of the die head, or the die head can be driven by the first moving component to make the lip of the die head abut against the moisturizing component.

[0005] In the above technical solution, the first moving component of the coating mechanism drives the die head and the roller shaft to move closer to or away from each other. The moisturizing component can be configured to be movable to abut against the lip of the die head, or the die head can be driven by the first moving component to make the lip of the die head abut against the moisturizing component. Thus, when the die head and the roller shaft move away from each other, the moisturizing component can moisten the lip of the die head, prevent the slurry at the lip of the die head from drying too fast, effectively alleviate the situation of slurry drying or agglomeration and gelation, and further reduce the probability of particle scratches when the coating device stops and starts coating, which is beneficial to ensuring the quality stability of the electrode sheet coating and improving the quality of the electrode sheet manufacturing process. Adopting the above solution, since it can keep the lip of the die head in a moist state, it is beneficial to reduce the frequency of disassembling or cleaning the die head, can reduce the workload of the staff in cleaning the die head, and further improve the efficiency of the electrode sheet manufacturing process.

[0006] In some embodiments, the coating device includes a second moving component, which is drivingly connected to the moisturizing component to drive the moisturizing component to move between the die head and the roller when the die head and the roller move away from each other. The die head can be driven by the first moving component so that the lip of the die head abuts against the moisturizing component. In the above technical solution, the die head is driven by the first moving component to approach or move away from the roller, and the moisturizing component is driven by the second moving component to abut against the lip of the die head. This can reduce the adjustment of the roller. The movable solutions for the die head and the moisturizing component are easier to implement and are also convenient to arrange, which is beneficial to the feasibility of the overall solution, reduces the manufacturing difficulty, simplifies the structure of the overall solution, and improves the system reliability of the entire device.

[0007] In some embodiments, the first moving component includes a transmission shaft and a conveyor belt. There are at least two transmission shafts, the conveyor belt is sleeved on at least two transmission shafts, and the conveyor belt is connected to the die head. In the above technical solution, the first moving component adopts the structure of a transmission shaft and a conveyor belt. The composition of the first moving component is relatively simple, and it has the advantages of stable transmission, precise control, low noise, and low cost, which is beneficial to improving the flexibility and stability of the movement of the die head, and at the same time can simplify the maintenance and operation processes.

[0008] In some embodiments, the moisturizing component includes: a base, a moisturizing member, and a buffer member. The buffer member is arranged between the moisturizing member and the base. In the above technical solution, the buffer member is arranged between the moisturizing member and the base. The buffer member can make the contact pressure distribution between the moisturizing member and the die head more uniform, improve the wetting effect of the moisturizing member on the lip of the die head, and can also reduce the risk of the die head being knocked and damaged due to the large force between the die head and the base when the die head presses against the moisturizing member.

[0009] In some embodiments, the moisturizing member includes: a soft shell, an accommodating space is provided inside the soft shell, and the soft shell is provided with a feeding port and an overflow port communicating with the accommodating space. The overflow port is arranged on the shell wall of the soft shell facing or adjacent to the die head; a moisturizing member body, which is configured to absorb the slurry and is arranged in the accommodating space.

[0010] In the above technical solution, the soft shell is soft and has a certain elasticity, which can adapt to the shape and pressure changes of the die head to ensure good contact under different working conditions. The moisturizing member body is configured to absorb the slurry, can absorb the slurry and release it slowly, reduce the waste of the slurry, and at the same time extend the service life of the moisturizing member. The soft shell can also isolate the internal slurry and the slurry absorbed by the moisturizing member body from the external environment, reduce the risk of the slurry being polluted by the external environment, and can improve the cleaning effect of the die head wetting.

[0011] In some embodiments, the main body of the moisturizing member is one of a jelly-like substance and a sponge-like structure. In the above technical solution, the design of using a jelly-like substance or a sponge-like structure for the main body of the moisturizing member has the advantages of high moisturizing performance, uniform release of the slurry, buffer protection, and easy maintenance. The jelly-like substance is more suitable for scenarios that require high precision and uniform release, while the sponge-like structure is more suitable for applications that require high liquid absorption capacity and low cost.

[0012] In some embodiments, the buffer member is a foam, and includes one of polyethylene, polystyrene, and polyurethane. In the above technical solution, the design of using a foam material for the buffer member significantly improves the working performance and reliability of the moisturizing component through advantages such as excellent buffering performance, lightweight, durability, low cost, and strong adaptability. At the same time, it can reduce the maintenance cost and operation difficulty. And using one of the materials of polyethylene, polystyrene, and polyurethane can provide more choices for the buffer member and reduce the cost.

[0013] In some embodiments, the moisturizing component extends along the axial direction of the roller shaft. The moisturizing component has a width direction perpendicular to the axial direction of the roller shaft. In the width direction, the size of the moisturizing member is smaller than that of the buffer member. In the above technical solution, in the width direction of the moisturizing component, the size of the moisturizing member is smaller than that of the buffer member. On the one hand, it can save materials and reduce costs. On the other hand, it is convenient to install the narrower moisturizing member onto the wider buffer member.

[0014] In some embodiments, the thickness of the moisturizing member is smaller than that of the buffer member. In the above technical solution, the thickness of the moisturizing member is smaller than that of the buffer member. Thus, the buffer member has a greater thickness and can have better buffering performance, providing a better buffering effect on the die head and reducing the risk of the die head being knocked and damaged.

[0015] In some embodiments, the die head is one or more. When there are multiple die heads, the multiple die heads are arranged in a stacked manner. In the above technical solution, a coating device that can adapt to a single or multiple die heads can improve the application range and meet more usage requirements.

[0016] In some embodiments, the die head has a height direction and a die width direction perpendicular to the axial direction of the roller shaft. The die width direction is perpendicular to the height direction. The roller shaft and the die head are arranged at intervals along the die width direction. In the direction where the die head points to the roller shaft, the size of the die head in the height direction gradually decreases, and the lip is provided on the side of the die head close to the roller shaft. In the above technical solution, the size of the die head in the height direction gradually decreases, that is, the width of the position where the lip of the die head is located is the smallest. This can reduce the risk of interference between the die head and other objects to be coated such as the electrode sheet, which is beneficial to improving the reliability and stability of the coating device during coating, and can also save materials and reduce costs.

[0017] In some embodiments, when the lip moisturizing component of the die head abuts, the moisturizing component is arranged obliquely relative to the die head. In the above technical solution, the moisturizing component is arranged obliquely relative to the die head. On the one hand, it can make the placement position of the moisturizing component adapt to the tapered structure of the die head, make the moisturizing component face the lip of the die head directly, reduce the probability that the position of the moisturizing component and the lip of the die head is deflected and affect the wetting effect, and improve the wetting reliability of the die head. On the other hand, the gravity can be utilized to make the excess slurry flow back to the moisturizing component naturally, reduce the possibility of slurry accumulation at the lip, and keep the lip clean. Brief Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1 Structural schematic diagram of a coating device provided by some embodiments of the present application;

[0020] Figure 2 Partial structural schematic diagram of a coating mechanism provided by some embodiments of the present application;

[0021] Figure 3 Schematic diagram of the abutment of the die head and the moisturizing component provided by some embodiments of the present application;

[0022] Figure 4 Stereoscopic structural schematic diagram of a moisturizing component provided by some embodiments of the present application;

[0023] Figure 5 Schematic diagram of the internal structure of a moisturizing member provided by some embodiments of the present application.

[0024] Reference Signs:

[0025] 10. Coating device;

[0026] 11. Coating mechanism;

[0027] 111. Die head; 111a. Lip; 111b. Slurry flow channel; 1101. Adjusting block; 112. Roller shaft; 113. First moving component; 1131. Transmission shaft; 1132. Conveyor belt;

[0028] 12. Moisturizing component;

[0029] 121. Base; 122. Buffer; 123. Moisturizing member; 1231. Soft outer shell; 1231a. Feeding port; 1231b. Overflow port; 1232. Moisturizing member body;

[0030] 13. The second moving component. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of rather than all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0033] Referring to "embodiments" in this application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0034] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The term " / and" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the front and rear associated objects.

[0036] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only illustrative and should not constitute any limitation to the present application.

[0037] The term "a plurality of" as used in the present application means two or more (including two).

[0038] The coating device of the present application is used to manufacture battery cells, and the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of the present application are not limited thereto. The battery cells can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the present application are not limited thereto either. Generally, the battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited thereto either.

[0039] The battery cell may include a housing, an electrode assembly and an electrolyte, and the housing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly works by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer, and the positive current collector without the coated positive active material layer serves as the positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer, and the negative current collector without the coated negative active material layer serves as the negative electrode ear. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that a large current can pass through without fusing, the number of positive electrode ears is multiple and stacked together, and the number of negative electrode ears is multiple and stacked together.

[0040] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0041] In the present application, the electrode tab of the battery cell can refer to the positive electrode tab or the negative electrode tab mentioned above.

[0042] In the field of new energy battery industry, the extrusion coating technology is mainly used to manufacture the electrode sheets of battery cells. It can precisely control the slit width and coating thickness online, achieve high-precision coating, and has good film coating uniformity, is applicable to the coating of various substrates, can perform multi-layer coating simultaneously, improve production efficiency and flexibility, and is highly favored in the industry. During the operation process, when it is inevitably necessary to stop the machine due to abnormal conditions, the slurry in the die head has poor fluidity and is prone to agglomeration and gelation. Moreover, the volatilization of volatile solvents in the slurry will also cause the slurry at the die head lip to dry relatively quickly, resulting in problems such as particle scratches easily occurring when starting the coating after the coating device stops, affecting the thickness and appearance consistency of the electrode sheet.

[0043] Based on the above considerations, in order to solve the problem that the slurry at the die head lip dries relatively quickly, resulting in easy occurrence of particle scratches, the applicant has designed a coating device, including: a coating mechanism and a moisturizing component. The coating mechanism includes a die head, a roller shaft, and a first moving component. The die head is provided with a lip. The first moving component is drivingly connected to the die head or the roller shaft to make the die head and the roller shaft approach or move away from each other; the moisturizing component is soaked with coating slurry, and the moisturizing component is configured to be movable to abut against the lip of the die head, or the die head can be driven by the first moving component to make the lip of the die head abut against the moisturizing component.

[0044] In the coating device with this structure, the first moving component of the coating mechanism can drive the die head and the roller shaft to move away from each other. The moisturizing component can be configured to be movable to abut against the lip of the die head, or the die head can be driven by the first moving component to make the lip of the die head abut against the moisturizing component. Thus, when the die head and the roller shaft move away from each other, the moisturizing component can moisten the lip of the die head, prevent the slurry at the lip of the die head from drying too quickly, effectively relieve the situation of slurry drying or agglomeration and gelation, and further reduce the probability of particle scratches occurring when starting the coating after the coating device stops, which is beneficial to ensuring the quality stability of electrode sheet coating and improving the quality of the electrode sheet manufacturing process.

[0045] The coating device disclosed in the embodiments of the present application can be used, but is not limited to, battery manufacturing, coating fabrics, packaging, medicine, optical films, electronic devices, etc. For example, the manufacture of electrode sheets of battery cells, the coating of packaging paper or plastic films, the manufacture of functional fabrics in the field of coated fabrics, and the manufacture of medical dressings and coatings of biomedical materials, etc.

[0046] For the convenience of description in the following embodiments, a coating device 10 of the embodiments of the present application is taken as an example for description.

[0047] Please refer to Figure 1 , Figure 1Schematic structural diagram of the coating device 10 provided by some embodiments of the present application. According to an embodiment of the present application, a coating device 10 includes a coating mechanism 11 and a moisturizing component 12. The coating mechanism 11 includes a die head 111, a roller shaft 112, and a first moving component 113. The die head 111 is provided with a lip 111a. The first moving component 113 is drivingly connected to the die head 111 or the roller shaft 112 to move the die head 111 and the roller shaft 112 closer to or farther away from each other. The moisturizing component 12 is impregnated with coating slurry, and the moisturizing component 12 is configured to be movable to abut against the lip 111a of the die head 111, or the die head 111 can be driven by the first moving component 113 to make the lip 111a of the die head 111 abut against the moisturizing component 12.

[0048] The die head 111 may refer to a structural member for coating slurry onto the object to be coated such as a pole piece. When the coating device 10 is used for coating slurry on a pole piece, the slurry coated by the die head 111 through the lip 111a can be a positive electrode slurry or a negative electrode slurry. The positive electrode slurry can be, but is not limited to, ternary materials (NCM, NCA), lithium iron phosphate (LFP), lithium cobalt oxide (LCO), etc. The negative electrode slurry can be, but is not limited to, graphite, silver carbide (AgC), silicon carbide (SiC), etc.

[0049] The roller shaft 112 may refer to a cylindrical roller for conveying the object to be coated such as a pole piece. The roller shaft 112 can be a driving roller or a driven roller, and no specific limitation is made here.

[0050] The first moving component 113 may refer to a component that can drive the die head 111 or the roller shaft 112 to move. The first moving component 113 can be connected to the die head 111 or the roller shaft 112, and no specific limitation is made here. The first moving component 113 can be, but is not limited to, a linear moving component, a swinging moving component, or a multi-degree-of-freedom moving component, etc. For example, when the first moving component 113 is a linear moving component, it can move the die head 111 and the roller shaft 112 closer to or farther away from each other in a straight line direction. When the first moving component 113 is a swinging moving component, it can swing one of the die head 111 and the roller shaft 112 to move closer to or farther away from each other.

[0051] The moisturizing component 12 generally refers to a device or structure for maintaining the wet state of the coating liquid (such as slurry, glue, etc.) at the lip 111a to prevent it from drying or curing prematurely.

[0052] In the above technical solution, the moisturizing component 12 can always remain stationary. For example, when the first moving component 113 is connected to the die head 111, for example, the first moving component 113 is a swing moving component. When driving the die head 111 away from the roller 112, it can simultaneously drive the die head 111 to swing until it abuts against the moisturizing component 12. The moisturizing component 12 can also be configured to be movable. For example, the moisturizing component 12 is equipped with a moving mechanism. When the die head 111 and the roller 112 move away from each other, the moving mechanism can drive the moisturizing component 12 to move until it abuts against the lip 111a of the die head 111. The moisturizing component 12 and the lip 111a of the die head 111 remaining in abutment is conducive to reducing the risk of material leakage at the lip 111a. Adopting the above solution can keep the lip 111a of the die head 111 in a wet state, which is conducive to reducing the frequency of disassembling or cleaning the die head 111, can reduce the workload of the staff in cleaning the die head 111, and thus improve the efficiency of the pole piece manufacturing process.

[0053] In the above technical solution, the first moving component 113 of the coating mechanism 11 drives the die head 111 and the roller 112 to approach or move away from each other. The moisturizing component 12 can be configured to be movable to abut against the lip 111a of the die head 111, or the die head 111 can be driven by the first moving component 113 so that the lip 111a of the die head 111 abuts against the moisturizing component 12. Thus, when the die head 111 and the roller 112 move away from each other, the moisturizing component 12 can moisten the lip 111a of the die head 111, prevent the slurry at the lip 111a of the die head 111 from drying too fast, can effectively relieve the situation of slurry drying or agglomeration gel, and further reduce the probability of particle scratches when the coating device 10 stops and starts coating, which is conducive to ensuring the quality stability of pole piece coating and improving the quality of the pole piece manufacturing process.

[0054] In some embodiments of the present application, referring to Figure 1 , the coating device 10 further includes a second moving component 13. The second moving component 13 is drivingly connected to the moisturizing component 12 to drive the moisturizing component 12 to move between the die head 111 and the roller 112 when the die head 111 and the roller 112 move away from each other. The die head 111 can be driven by the first moving component 113 so that the lip 111a of the die head 111 abuts against the moisturizing component 12.

[0055] The second moving component 13 can be a component that moves the moisturizing component 12, and can be, but is not limited to, a linear moving component, a swing moving component, a multi-degree-of-freedom moving component, etc. Exemplarily, the second moving component 13 is a linear moving component, and can be, but is not limited to, a cylinder, an electric push rod, a linear module, etc.

[0056] In the above technical solution, the die head 111 is driven by the first moving component 113 to approach or move away from the roller 112, and the moisturizing component 12 is driven by the second moving component 13 to abut against the lip 111a of the die head 111. This can reduce the adjustment of the roller 112. The movable solutions for the die head 111 and the moisturizing component 12 are easier to implement, convenient to arrange, beneficial to the feasibility of the overall solution, reduce the manufacturing difficulty, and can also simplify the structure of the overall solution and improve the system reliability of the entire device.

[0057] In some embodiments of the present application, referring to Figure 1 and Figure 2 , the first moving component 113 includes a transmission shaft 1131 and a conveyor belt 1132. There are at least two transmission shafts 1131. The conveyor belt 1132 is sleeved on at least two transmission shafts 1131, and the conveyor belt 1132 is connected to the die head 111.

[0058] One of the at least two transmission shafts 1131 can be driven by a motor, so that the transmission shaft 1131 can rotate, drive the conveyor belt 1132 to move, and then drive the die head 111 to be pushed or pulled in the horizontal direction, so that the die head 111 can move forward to the position of the moisturizing component 12 smoothly and at a constant speed. The material of the conveyor belt 1132 can be, but is not limited to, rubber, cloth, stainless steel, etc. The transmission structure composed of the conveyor belt 1132 and the transmission shaft 1131 can also be, but is not limited to, chain drive, belt drive, etc.

[0059] Optionally, the coating device 10 may include a guiding component. The guiding component is guidingly connected to the die head 111 to guide the die head 111 to move along the moving direction of the conveyor belt 1132. The guiding component can be, but is not limited to, a guide rail or a guide rod, etc.

[0060] In the above technical solution, the first moving component 113 adopts the structure of the transmission shaft 1131 and the conveyor belt 1132. The composition of the first moving component 113 is relatively simple, and it has the advantages of stable transmission, precise control, low noise, and low cost, which is beneficial to improving the flexibility and stability of the movement of the die head 111, and at the same time can simplify the maintenance and operation processes.

[0061] In some embodiments, the die head 111 and the conveyor belt 1132 can be connected by, but are not limited to, a clamp connection, a bolt connection, or a hinge connection.

[0062] In some embodiments, referring to Figure 3 and Figure 4 , the moisturizing component 12 includes: a base 121, a moisturizing member 123, and a buffer member 122. The buffer member 122 is provided between the moisturizing member 123 and the base 121.

[0063] The moisturizing member 123 can refer to a structure or component that can moisten the slurry.

[0064] The buffer member 122 can refer to a structure or component that can play a buffering role.

[0065] In the above technical solution, the buffer member 122 is provided between the moisturizing member 123 and the base 121. The buffer member 122 can make the contact pressure distribution between the moisturizing member 123 and the die head 111 more uniform, improve the wetting effect of the moisturizing member 123 on the lip 111a of the die head 111, and can also reduce the risk of the die head 111 being damaged by a large force between the die head 111 and the base 121 when the die head 111 presses tightly against the moisturizing member 123.

[0066] In some embodiments, the moisturizing member 123 and the buffer member 122 can be connected by an adhesive method. This connection method is relatively simple, has a relatively low cost, and has a firm bond.

[0067] In some embodiments, referring to Figure 5 , the moisturizing member 123 includes a soft outer shell 1231 and a moisturizing member main body 1232. An accommodation space is provided inside the soft outer shell 1231, and the soft outer shell 1231 is provided with a material injection port 1231a and an overflow port 1231b that communicate with the accommodation space. The overflow port 1231b is provided on the shell wall of the soft outer shell 1231 that faces or is adjacent to the die head 111; the moisturizing member main body 1232 is configured to be able to absorb the slurry and is provided in the accommodation space.

[0068] The soft outer shell 1231 can refer to an outer shell that can be deformed under pressure. The material of the soft outer shell 1231 can be, but is not limited to, thin iron sheets, plastics, rubbers, etc. For example, the soft outer shell 1231 can be composed of a stainless steel thin sheet.

[0069] The material injection port 1231a can refer to an inlet for injecting the slurry into the accommodation space of the soft outer shell 1231. The overflow port 1231b can refer to an opening through which the slurry overflows from the soft outer shell 1231. The overflow port 1231b can be provided on the shell wall of the soft outer shell 1231 that faces the die head 111, or can be provided on the side wall of the soft outer shell 1231 that is adjacent to the die head 111. The overflow port 1231b can be set to one or more, and no specific limitation is made here. Exemplarily, referring to Figure 5 , the overflow port 1231b is two.

[0070] The moisturizing member main body 1232 can refer to a structure or component that can adsorb the slurry.

[0071] It can be understood that when the lip 111a of the die head 111 abuts against the moisturizing member 123, the die head 111 squeezes the soft outer shell 1231 to deform, enabling the slurry inside the soft outer shell 1231 to flow out through the overflow port 1231b to the surface of the soft outer shell 1231, thereby allowing the overflowed slurry to moisten the lip 111a of the die head 111. The moisturizing member main body 1232 can absorb more slurry, which is beneficial to maintaining the state where the inside of the soft outer shell 1231 is filled with slurry for a long time.

[0072] In the above technical solution, the soft outer shell 1231 is soft and has a certain elasticity, which can adapt to the shape and pressure changes of the die head 111 to ensure good contact under different working conditions. The moisturizing member main body 1232 is configured to absorb the slurry, can absorb the slurry and release it slowly, reduce the waste of the slurry, and at the same time extend the service life of the moisturizing member 123. The soft outer shell 1231 can also isolate the slurry inside and the slurry absorbed by the moisturizing member main body 1232 from the external environment, reduce the risk of the slurry being polluted by the external environment, and can improve the cleaning effect of the wetting of the die head 111.

[0073] In some embodiments, the moisturizing member main body 1232 is one of a gel-like substance and a sponge-like structure.

[0074] It can be understood that the moisturizing member main body 1232 can be a gel-like object, which has good water absorption and can remain in a wet state for a long time after absorbing the slurry. The moisturizing member main body 1232 can also be a sponge-like structure. Exemplarily, the moisturizing member main body 1232 can be a sponge, which also has good water absorption and can remain in a wet state for a long time.

[0075] In the above technical solution, the design of using a gel-like substance or a sponge-like structure for the main body of the moisturizing member 123 has the advantages of high moisturizing performance, uniform slurry release, buffer protection, and easy maintenance. The gel-like substance is more suitable for scenarios requiring high precision and uniform release, while the sponge-like structure is more suitable for applications requiring high liquid absorption capacity and low cost.

[0076] In some embodiments, referring to Figure 3 and Figure 4 , the buffer member 122 is a foam and includes one of polyethylene, polystyrene, and polyurethane.

[0077] In the above technical solution, the design of using a foam material for the buffer member 122 significantly improves the working performance and reliability of the moisturizing component 12 through advantages such as excellent buffer performance, light weight, durability, low cost, and strong adaptability. At the same time, it can reduce the maintenance cost and operation difficulty. And using one of the materials of polyethylene, polystyrene, and polyurethane can provide more choices for the buffer member 122 and can reduce the cost.

[0078] In some embodiments of the present invention, the buffer member 122 is a multi-layer structure arranged in a stacked manner. For example, the buffer member 122 may be, but is not limited to, a foam structure with two layers, three layers, four layers, etc. Refer to Figure 3 , the buffer member 122 is a three-layer foam structure arranged in a stacked manner.

[0079] In some embodiments, refer to Figure 2 and Figure 3 , the moisturizing member 12 extends along the axial direction of the roller shaft 112. The moisturizing member 12 has a width direction perpendicular to the axial direction of the roller shaft 112. In the width direction, the size of the moisturizing member 123 is smaller than that of the buffer member 122.

[0080] The axial direction of the roller shaft 112 may refer to the Figure 2 second direction Y, and the "width direction of the moisturizing member 12 perpendicular to the axial direction of the roller shaft 112" may refer to the Figure 3 third direction Z.

[0081] In the above technical solution, in the width direction of the moisturizing member 12, the size of the moisturizing member 123 is smaller than that of the buffer member 122. On the one hand, it can save materials and reduce costs. On the other hand, it is convenient to install the narrower moisturizing member 123 on the wider buffer member 122.

[0082] In some embodiments, refer to Figure 3 , the thickness of the moisturizing member 123 is smaller than that of the buffer member 122.

[0083] In the above technical solution, the thickness of the moisturizing member 123 is smaller than that of the buffer member 122. Thus, the buffer member 122 has a greater thickness and can have better buffering performance, providing a better buffering effect on the die head 111 and reducing the risk of the die head 111 being damaged by collision.

[0084] In some embodiments, refer to Figure 3 , the die head 111 is one or more. When there are multiple die heads 111, the multiple die heads 111 are arranged in a stacked manner.

[0085] That is to say, the die head 111 can be one; the die head 111 can also be multiple. Refer to Figure 3 , there are three die heads 111, and the three die heads 111 are arranged in a stacked manner along the third direction Z. A slurry flow channel 111b and a lip 111a are jointly formed between two adjacent die heads 111. The die head 111 can be made of, but is not limited to, stainless steel, ceramic, etc.

[0086] In the above technical solution, the coating device 10 that can adapt to single or multiple die heads 111 can expand the application range and meet more usage requirements.

[0087] In some embodiments, referring to Figure 3 , the die head 111 has a height direction perpendicular to the axial direction of the roller shaft 112, and a die width direction perpendicular to the axial direction of the roller shaft 112. The die width direction is perpendicular to the height direction. The roller shaft 112 and the die head 111 are arranged at intervals in the die width direction. In the direction from the die head 111 towards the roller shaft 112, the dimension of the die head 111 in the height direction gradually decreases, and the lip 111a is provided on the side of the die head 111 close to the roller shaft 112.

[0088] The "height direction of the die head 111 perpendicular to the axial direction of the roller shaft 112" can refer to Figure 3 the third direction Z. The "die width direction of the die head 111 perpendicular to the axial direction of the roller shaft 112" can refer to Figure 1 the first direction X. Among them, the first direction X, the third direction Z, and the second direction Y described above can be perpendicular to each other.

[0089] In the above technical solution, the dimension of the die head 111 in the height direction gradually decreases, that is, the width at the position where the lip 111a of the die head 111 is located is the smallest. This can reduce the risk of interference between the die head 111 and other objects to be coated such as the pole piece, which is beneficial to improving the reliability and stability of the coating device 10 for coating, and can also save materials and reduce costs.

[0090] In some embodiments, referring to Figure 3 , when the lip 111a of the die head is in contact with the moisturizing component 12, the moisturizing component 12 is arranged obliquely relative to the die head 111.

[0091] In the above technical solution, the moisturizing component 12 is arranged obliquely relative to the die head 111. On the one hand, it can make the placement position of the moisturizing component 12 adapt to the tapered structure of the die head 111, make the moisturizing component 12 face the lip 111a of the die head 111, and reduce the probability that the position deviation between the moisturizing component 12 and the lip 111a of the die head 111 affects the wetting effect, which can improve the wetting reliability of the die head 111. On the other hand, it can utilize the gravity effect to make the excess slurry naturally flow back into the moisturizing component 12, reduce the possibility of slurry accumulation at the lip 111a, and keep the lip 111a clean.

[0092] In some embodiments, referring to Figure 2 , the die head 111 is provided with adjusting blocks 1101. There are multiple adjusting blocks 1101 and they are arranged at intervals along the length direction of the die head 111. The adjusting blocks 1101 are used to adjust the channel size of the internal slurry flow channel 111b, thereby adjusting the slurry flow rate in the corresponding area. That is to say, for the situation where there is uneven coating in some positions of the pole piece coating, the slurry flow rate in a certain area can be adjusted by adjusting some of the multiple adjusting blocks 1101, and then the coating uniformity of the slurry can be adjusted.

[0093] Optionally, the adjusting block 1101 can be a T-shaped block, and can be made of, but not limited to, stainless steel, ceramic, etc. Further, the adjustment range of each adjusting block 1101 is 0 to 3 mm, and the display accuracy can be 1 μm.

[0094] The following will describe a specific embodiment of the coating device 10 of the present application in conjunction with Figures 1 to 5 ... to describe a specific embodiment of the coating device 10 of the present application.

[0095] A coating device 10 according to an embodiment of the present application includes a coating mechanism 11, a moisturizing component 12, and a second moving component 13.

[0096] The coating mechanism 11 includes a die head 111, a roller shaft 112, and a first moving component 113. The die head 111 is provided with a lip 111a, and the first moving component 113 is drivingly connected to the die head 111 to move the die head 111 and the roller shaft 112 closer to or away from each other.

[0097] The first moving component 113 includes two drive shafts 1131 and a conveyor belt 1132. The conveyor belt 1132 is sleeved on the two drive shafts 1131, and the conveyor belt 1132 is connected to the die head 111.

[0098] The moisturizing component 12 includes a base 121, a moisturizing member 123, and a buffer member 122. The buffer member 122 is provided between the moisturizing member 123 and the base 121. The moisturizing member 123 includes a soft outer shell 1231 and a moisturizing member main body 1232. An accommodation space is provided inside the soft outer shell 1231, and the soft outer shell 1231 is provided with a feeding port 1231a and an overflow port 1231b communicating with the accommodation space. The overflow port 1231b is provided on the shell wall of the soft outer shell 1231 facing or adjacent to the die head 111; the moisturizing member main body 1232 is configured to absorb the slurry and is provided in the accommodation space.

[0099] The second moving component 13 is drivingly connected to the moisturizing component 12 to drive the moisturizing component 12 to move between the die head 111 and the roller shaft 112 when the die head 111 and the roller shaft 112 move away from each other. The die head 111 can be driven by the first moving component 113 to make the lip 111a of the die head 111 abut against the moisturizing component 12.

[0100] In the coating device 10 with the above structure, the first moving component 113 is drivingly connected to the die head 111 to move the die head 111 and the roller shaft 112 away from each other. The second moving component 13 is drivingly connected to the moisturizing component 12 to drive the moisturizing component 12 to move between the die head 111 and the roller shaft 112 to make the lip 111a of the die head 111 abut against the moisturizing component 12, so as to reduce the drying rate of the slurry at the lip 111a of the volatile solvent, improve the particle scratches in the coating process, and improve the quality of the pole piece manufacturing process.

[0101] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, if there is no special instruction, all the implementation manners and optional implementation manners of the present application can be combined with each other to form a new technical solution. If there is no special instruction, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coating device, characterized in that: include: The coating mechanism comprises a die head, a roller shaft and a first moving component, wherein the die head is provided with a lip, and the first moving component is driven to connect the die head or the roller shaft so that the die head and the roller shaft are moved closer to or farther from each other; A moisturizing component is soaked with coating slurry and is configured to be movable to abut against the lip of the die, or the die can be driven by the first moving component to make the lip of the die abut against the moisturizing component.

2. The coating device according to claim 1, characterized in that: The coating device includes a second movable component, which is driven and connected to the moisturizing component to drive the moisturizing component to move between the die head and the roller when the die head and the roller are away from each other. The die head can be driven by the first movable component so that the lip of the die head abuts against the moisturizing component.

3. The coating device according to claim 2, characterized in that: The first moving component comprises a transmission shaft and a conveyor belt, there are at least two transmission shafts, the conveyor belt is sleeved on at least two of the transmission shafts, and the conveyor belt is connected to the die head.

4. The coating device according to claim 1, characterized in that: The moisturizing component comprises a base, a moisturizing member and a buffer member, wherein the buffer member is arranged between the moisturizing member and the base.

5. The coating device according to claim 4, characterized in that: The moisturizing member comprises: A soft shell, wherein a containing space is provided inside the soft shell, and the soft shell is provided with an injection port and an overflow port communicating with the containing space, and the overflow port is provided on a shell wall of the soft shell directly facing or adjacent to the die head; The moisturizing member body is configured to absorb slurry and is disposed in the accommodating space.

6. The coating device according to claim 5, characterized in that: The main body of the moisturizing component is a colloid or a sponge-like structure.

7. The coating device according to any one of claims 4 to 6, characterized in that: The buffer is foam and includes one of polyethylene, polystyrene and polyurethane.

8. The coating device according to any one of claims 4 to 6, characterized in that: The moisturizing component extends along the axial direction of the roller shaft, and has a width direction perpendicular to the axial direction of the roller shaft. In the width direction, the moisturizing component has a size smaller than that of the buffer component.

9. The coating device according to any one of claims 4 to 6, characterized in that: The thickness of the moisturizing component is smaller than the thickness of the buffer component.

10. The coating device according to any one of claims 1 to 4, characterized in that: There are one or more die heads, and when there are multiple die heads, the multiple die heads are arranged in a stacked manner.

11. The coating device according to any one of claims 1 to 4, characterized in that: The die head has a height direction and a die width direction which are perpendicular to the axial direction of the roller shaft, wherein the die width direction is perpendicular to the height direction, wherein the roller shaft and the die head are spaced apart along the die width direction, and in the direction in which the die head points to the roller shaft, the size of the die head in the height direction gradually decreases, and the lip is arranged on a side of the die head close to the roller shaft.

12. The coating device according to any one of claims 1 to 4, characterized in that: When the lip of the die head contacts the moisturizing component, the moisturizing component is arranged tilted relative to the die head.

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