CN221694120U

CN221694120U - Coating device and pole piece production system

Info

Publication number: CN221694120U
Application number: CN202421505694.XU
Authority: CN
Inventors: 吕佳祺; 商红武
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-06-28
Filing date: 2024-06-28
Publication date: 2024-09-13
Anticipated expiration: 2034-06-28

Abstract

The application provides a coating device and a pole piece production system. A coating device for coating a slurry onto a substrate of a pole piece, comprising: the coating roller can rotate around the axis of the coating roller and is used for coating slurry; and the axial width of the pressing roller is matched with the width of the region to be coated on the substrate, so that the pressing roller is used for pressing one side of the region to be coated on the substrate, which is opposite to the coating roller, and at least part of the region to be coated protrudes towards the direction close to the coating roller. Through setting up the compression roller, support one side of waiting to coat the region back to the coating roller on the substrate, make the substrate wait to coat the region to the direction protrusion of coating roller, and with the coating roller contact, make the thick liquids coating on the coating roller to the waiting to coat the region of substrate, just so can be in on the circumference side of coating roller with wait to coat the thick liquids of region corresponding position on the substrate can coat the region, need not to scrape the thick liquids of coating roller terminal surface, can make the thick liquids of coating even, promote the uniformity of the thickness of the functional layer that forms.

Description

Coating device and pole piece production system

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a coating device and a pole piece production system.

Background

In the pole piece manufacturing process, different functional layers are often required to be coated on a plurality of areas of a substrate. In the current coating process, particularly in the secondary coating process, a roller body with the same width as the area to be coated is often arranged, the roller body is made to pass through the slurry for forming the functional layer, the slurry is attached to the roller body, and then a scraper is used for scraping off the excessive slurry on the end face of the roller body and then the slurry is coated on the set position of the base material. The doctor blade used in this manner is typically a fluted doctor blade configuration in which the side walls of the flutes are used to scrape excess slurry from the end surfaces of the roll body. However, with this structure, the excessive slurry on the end face of the roll body is difficult to scrape off, resulting in poor uniformity of thickness of the functional layer coated on the pole piece.

Disclosure of utility model

The embodiment of the application aims to provide a coating device and a pole piece production system so as to solve the problem of poor thickness consistency of a coating functional layer in the related art.

In a first aspect, an embodiment of the present application provides a coating apparatus for coating a slurry onto a substrate of a pole piece, including:

the coating roller can rotate around the axis of the coating roller and is used for coating slurry; and

The axial width of the press roller is matched with the width of the region to be coated on the base material, so that the press roller is used for pressing one side of the region to be coated on the base material, which is opposite to the coating roller, and at least part of the region to be coated protrudes towards the direction close to the coating roller.

According to the technical scheme, the pressing roller is arranged to press one side of the to-be-coated area on the substrate, which is opposite to the coating roller, so that the to-be-coated area on the substrate protrudes towards the direction of the coating roller and contacts with the coating roller, the slurry on the coating roller is coated on the to-be-coated area of the substrate, so that only the slurry at the position on the peripheral side surface of the coating roller, which corresponds to the to-be-coated area, is coated on the to-be-coated area of the substrate, and the slurry on the end surface of the coating roller is not required to be scraped, so that the structure is simplified, the coated slurry is uniform, and the consistency of the thickness of the formed functional layer is further improved.

In some embodiments, the coating device includes a doctor blade disposed on an outer peripheral side of the coating roller to scrape off a portion of the slurry on the peripheral side of the coating roller.

The scraper is arranged to scrape partial slurry on the peripheral side surface of the coating roller, so that redundant slurry on the peripheral side surface of the coating roller can be scraped, the slurry on the peripheral side surface of the coating roller is more uniformly distributed, the slurry coated on the substrate is uniform, and the thickness consistency of the formed functional layer is further improved.

In some embodiments, the doctor blade is disposed in a straight line adjacent one side of the applicator roll.

The scraper is arranged in a straight line near one side of the coating roller, so that the structure of the scraper is simplified, and the processing and the manufacturing are convenient.

In some embodiments, the coating roller is provided with attachment grooves distributed on its peripheral side at least at positions corresponding to the areas to be coated.

The coating roller is provided with at least one coating groove at the position corresponding to the area to be coated, so that the slurry is adhered, and the slurry is coated on the substrate conveniently.

In some embodiments, the attachment grooves are distributed over the entire peripheral side of the applicator roll.

The attaching grooves are distributed on the whole peripheral side surface of the coating roller, and the processing positions of the attaching grooves are not needed to be considered, so that the coating roller is convenient to process and manufacture.

In some embodiments, a plurality of press rolls are provided, the plurality of press rolls being spaced apart.

The multiple press rolls are arranged, so that the slurry can be coated on the substrate in multiple areas to be coated simultaneously, and the efficiency is improved.

In some embodiments, the coating device includes a support shaft, and the pressure roller is mounted on the support shaft and is movable in an axial direction of the support shaft.

The supporting shaft is arranged so as to support the press roller, and the press roller is convenient to assemble and use;

The press roller is movably arranged on the supporting shaft, so that the position of the press roller can be conveniently adjusted, and the position of the press roller can be set according to the position of the region to be coated on the base material, so as to adapt to different pole piece processing requirements.

In some embodiments, the applicator roll is cylindrical or barrel-shaped.

The coating roller is cylindrical or cylindric to make things convenient for processing and manufacturing.

In some embodiments, the coating device includes a reservoir for storing the slurry, and a portion of the coating roller is positioned within the reservoir.

The liquid storage tank is arranged, and a part of the coating roller is positioned in the liquid storage tank, so that the slurry is convenient to store and is convenient to adhere to the coating roller.

In some embodiments, the coating apparatus includes a winding roller for winding the coated substrate.

The winding roller is provided to transport and recover the substrate, and the substrate is passed between the coating roller and the pressing roller to apply the slurry to the substrate.

In some embodiments, the coating apparatus includes a first pass roller for supporting and guiding the movement of the substrate, the first pass roller being disposed between the coating roller and the winding roller.

The first pass roller is arranged to provide guiding and tensioning force for the substrate output from the coating roller and the compression roller so as to enable the coated substrate to return to be flat for collection.

In some embodiments, the coating device includes a second pass roller for supporting and guiding the movement of the substrate, the second pass roller being disposed on a side of the coating roller remote from the take-up roller.

The second pass roller is arranged to provide guiding and tensioning force for the substrate entering between the coating roller and the compression roller so that the compression roller can eject the area to be coated on the substrate to contact the slurry on the coating roller for coating.

In a second aspect, an embodiment of the present application provides a pole piece production system, including a coating device as described in the above embodiment.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings used in the embodiments or exemplary technical descriptions, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a substrate according to some embodiments of the application;

FIG. 2 is a schematic diagram of a coating apparatus according to some embodiments of the present application;

FIG. 3 is a schematic view of a portion of the coating apparatus of FIG. 2;

Fig. 4 is a schematic structural view of a coating device in a slurry coating state according to some embodiments of the present application.

Wherein, each reference numeral in the figure mainly marks:

10-a substrate; 11-a region to be coated; 111-a first process coating zone; 112-a second process coating zone;

21-a coating roller; 211-attachment grooves; 22-a press roll; 23-supporting the shaft; 24-a liquid storage tank; 25-scraping knife; 26-winding roller; 27-first pass roller; 28-second pass roller;

30-sizing agent.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

Unless defined otherwise, 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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments in any suitable manner.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two). The meaning of "a number" is one or more than one unless specifically defined otherwise.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element unless explicitly stated and limited otherwise. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In describing embodiments of the present application, the term "adjacent" refers to being in close proximity unless explicitly stated and defined otherwise. For example, for the three components a ₁、A₂ and B, the distance between a ₁ and B is greater than the distance between a ₂ and B, then a ₂ is closer to B than a ₁, i.e., a ₂ is adjacent to B, which can be said to be adjacent to a ₂. For another example, when there are multiple C parts, each C part being C ₁、C₂……C_N, when one of the C parts, such as C ₂, is closer to the B part than the other C parts, then B is adjacent to C ₂, also known as C ₂ is adjacent to B.

The battery cell in the embodiment of the application comprises, but is not limited to, a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, and the like. The shape of the battery cell includes, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc. The battery cells are typically packaged, including but not limited to, being divided into: cylindrical battery cells, prismatic battery cells, and pouch battery cells.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module, a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells to some extent. In some cases, the battery cells may be used directly, i.e., the battery may not include a case, which is not limited herein.

In the battery, when the number of the battery cells is multiple, the battery cells can be connected in series or in parallel, and the series-parallel connection refers to that the battery cells are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery monomers is accommodated in the box body; of course, the battery can also be in a form of a battery module formed by connecting a plurality of battery monomers in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole body and accommodating the whole body in the box body. The battery may further include other structures, for example, a bus member for making electrical connection between the plurality of battery cells.

The battery cell in the embodiment of the application includes an electrode assembly and a case in which the electrode assembly is mounted to protect the electrode assembly through the case.

The electrode assembly is also called a bare cell, is a component for storing and releasing electric energy, and consists of a positive plate, a negative plate and a diaphragm. The electrode assembly operates primarily by means of metal ions moving between the positive and negative electrode sheets. The positive plate comprises a positive current collector and a positive active material layer, wherein the positive active material layer is coated on the surface of the positive current collector, a part of the positive current collector, which is not coated with the positive active material layer, protrudes out of the part, which is coated with the positive active material layer, of the positive current collector, and the part, which is not coated with the positive active material layer, is used as a positive electrode lug, or a metal conductor is welded and led out of the positive current collector to be used as the positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the part of the negative electrode current collector, which is not coated with the negative electrode active material layer, protrudes out of the part, which is coated with the negative electrode active material layer, of the negative electrode current collector, and the part, which is not coated with the negative electrode active material layer, is used as a negative electrode tab, or a metal conductor is welded and led out of the negative electrode current collector to be used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The positive and negative electrode sheets are collectively referred to as a pole sheet. The positive and negative current collectors are collectively referred to as current collectors, also referred to as substrates. The positive electrode active material layer and the negative electrode active material layer are collectively referred to as an active material layer, and are also referred to as a functional layer.

The electrode assembly may be a rolled structure or a laminated structure. The embodiments of the present application are not limited thereto. The winding structure is characterized in that the lugs are welded on the current collector and are arranged in the sequence of positive plates, diaphragms, negative plates and diaphragms; and winding to form a cylindrical or square battery cell. The lamination type structure is characterized in that a tab is led out of a current collector, a positive plate, a negative plate and a diaphragm are arranged in sequence from the positive plate to the diaphragm to the negative plate to the diaphragm, and the positive plate, the diaphragm and the negative plate are laminated layer by layer to form a lamination type battery cell; wherein the membrane may be cut and laminated directly with the membrane sheet, or the membrane may not be cut and laminated with a Z-fold. The separator may be made of PP (Polypropylene) or PE (Polyethylene). The diaphragm is the insulating film of setting between positive plate and negative plate, and its main roles are: the positive electrode and the negative electrode are isolated, electrons in the battery cannot pass through freely, short circuit is prevented, and ions in the electrolyte can pass through freely between the positive electrode and the negative electrode, so that a loop is formed between the positive electrode and the negative electrode. The positive electrode tab and the negative electrode tab are collectively referred to as tabs.

In the pole piece manufacturing process, different functional layers are often required to be coated on a plurality of areas of a substrate. For example, burrs are easily generated at the edge positions in the production process of the electrode plate, particularly the edges of the die-cut electrode tabs, and the coating width of the active material layer on the negative electrode plate generally exceeds that of the active material layer on the positive electrode plate, so that the coating area of the active material layer on the negative electrode plate is closer to the die-cut position of the electrode tab of the positive electrode plate. Therefore, the sharp burrs can puncture the diaphragm, so that a contact stroke short circuit occurs between the positive plate and the negative plate, and fire explosion can be caused when the contact stroke short circuit is severe. In order to prevent the burrs from affecting, insulating materials can be coated on the current collector of the pole piece in the edge area close to the lug, or insulating materials such as lug glue and the like are coated on the two sides of the active material layer on the current collector of the pole piece to form an insulating layer so as to cover the burrs generated in the area close to the lug on the current collector, and the risk of short circuit between the positive pole piece and the negative pole piece after the burrs or metal chips puncture the diaphragm is reduced. In order to reduce the risk of the service life of the battery caused by the mixing of the slurries of different functional layers, only one slurry is often coated at each coating time to form one functional layer. Thus, when the pole piece includes multiple functional layers, multiple coatings are often required. In addition, active substance layers made of various materials are used in some pole pieces, and the pole pieces also need to be coated for multiple times to form corresponding functional layers.

Each subsequent coating operation is referred to as a secondary coating, which may also be referred to as a re-coating, performed on the substrate.

In the current coating process, particularly in the secondary coating process, a roller body with the same width as the area to be coated is often arranged, the roller body is made to pass through the slurry for forming the functional layer, the slurry is attached to the roller body, and then a scraper is used for scraping off the excessive slurry on the end face of the roller body and then the slurry is coated on the set position of the base material. The doctor blade used in this manner is typically a fluted doctor blade structure in which a portion of the roll body is disposed in the flute, and in use, the roll body passes through the flute and the side walls of the flute scrape excess slurry from the end face of the roll body. However, with this structure, the slurry on the end face of the roll body is difficult to scrape off, and after the slurry is applied to the substrate, the excessive slurry is caught by the edge of the set area, resulting in poor uniformity of thickness of the functional layer formed.

Based on the above-mentioned considerations, in order to improve the problem of poor uniformity of thickness of the coating functional layer, the embodiment of the present application provides a coating apparatus for coating slurry onto a substrate of a pole piece. The coating device is characterized in that the pressing roller is arranged to press the back surface of the to-be-coated area on the substrate, the to-be-coated area on the substrate protrudes towards the direction close to the coating roller and contacts with the coating roller, so that slurry on the coating roller is coated on the to-be-coated area of the substrate, slurry at the position corresponding to the to-be-coated area on the peripheral side surface of the coating roller is coated on the to-be-coated area of the substrate, and the substrate does not contact with the end part of the coating roller, so that the slurry on the end surface of the coating roller does not need to be scraped, the structure can be simplified, the coated slurry is uniform, and the consistency of the thickness of the formed functional layer is improved.

The coating device provided by the embodiment of the application can be applied to the processing and manufacturing of the pole piece, such as the processing and manufacturing of the positive pole piece and the processing and manufacturing of the negative pole piece. The coating device of the embodiment of the application not only can be used for coating the primary (namely primary) slurry on the base material of the pole piece, but also can be used for coating the secondary (namely secondary) slurry on the base material.

Referring to fig. 1, an example of a pole piece is a pole piece manufactured by coating a slurry of an active material on a substrate 10 as a pole piece current collector to form an active material layer. In addition, insulating layers are coated on two sides of the active material layer on the substrate 10, so that burrs produced during processing are reduced, and the risk of short circuit between the positive electrode plate and the negative electrode plate after the burrs or metal chips pierce the separator is reduced. Thus, two types of areas 11 to be coated, such as a first process coating area 111 for coating an active material layer and a second process coating area 112 for coating an insulating layer, are provided on the substrate 10. The coating device according to the embodiment of the present application may be used to coat the first process coating region 111 or may be used to coat the second process coating region 112.

Referring to fig. 2, 3 and 4, in accordance with some embodiments of the present application, a coating apparatus is provided for applying a slurry 30 to a substrate 10 of a pole piece. The coating device comprises a coating roller 21 and a pressing roller 22. The applicator roll 21 is rotatable about its own axis for applying the slurry 30. The axial width of the pressing roller 22 is adapted to the width of the area 11 to be coated on the substrate 10, so as to be used for pressing one side of the area 11 to be coated on the substrate 10, which is opposite to the coating roller 21, so that at least part of the area 11 to be coated on the substrate 10 protrudes towards the direction approaching the coating roller 21.

The coating apparatus is an apparatus for applying a slurry to the band-shaped substrate 10.

The base material 10 is a member or a part that carries a functional layer or an active material layer and that gathers and outputs current generated by the active material, and the base material 10 may be copper foil or aluminum foil.

The slurry 30 is a liquid raw material prepared by coating the substrate 10 with a material for forming a functional layer to be prepared on the substrate 10. The slurry 30 may be made of an active material so that an active material layer may be formed upon application to the substrate 10. Of course, the slurry 30 may also be made of an insulating material, such as an insulating glue, an insulating paint, or the like. The slurry 30 may also be a primer applied to the substrate 10, and the primer is provided on the substrate 10 so as to apply an active material layer and an insulating layer to the substrate 10, thereby improving the bonding force of the active material layer to the substrate 10 and the bonding force of the insulating layer to the substrate 10.

The primer comprises a functional material, a binder and a conductive agent, wherein the binder can be at least one selected from polyvinylidene fluoride, copolymer of vinylidene fluoride and hexafluoropropylene, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene and styrene-butadiene rubber, and the conductive agent can be at least one selected from carbon black, carbon fiber, carbon nano tube, graphite, graphene, metal powder, composite conductive material and conductive ceramic powder.

The insulating adhesive is at least one of oil-based epoxy resin, bismaleimide resin, water-based polyvinylidene fluoride and polyimide. The insulating coating is a metal oxide particle coating, and the components of the material comprise metal oxide particles, polyvinylidene fluoride and N-methyl pyrrolidone, wherein the material of the metal oxide particles can be selected from aluminum oxide, titanium dioxide, zinc oxide, magnesium oxide and combinations thereof.

The active materials are divided into positive electrode active materials and negative electrode active materials, namely, the positive electrode active materials are used in active material slurry of the positive electrode sheet, and the positive electrode active materials comprise at least one of lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel oxide, lithium nickel manganese oxide and lithium iron manganese nickel oxide. The negative electrode active material is used in the active material slurry of the negative electrode sheet. The positive electrode active material includes carbon, silicon, or the like.

The region to be coated 11 refers to a region to be coated with a slurry on the substrate 10 to form a desired functional layer in one coating process. The substrate 10 has two opposite surfaces, each of which may have a region 11 to be coated, and coating the region 11 to be coated on one surface is completed before coating the region 11 to be coated on the other surface. For example, there may be multiple areas on the same surface of the substrate 10 where the slurry is applied by different processes. For example, on the same surface of the substrate 10, a region to which the slurry is applied by two steps may be provided, a region to which the slurry is applied by one step may be referred to as a first step application region 111, and a region to which the slurry is applied by one step may be referred to as a second step application region 112. In one coating process, only one of the coating areas is coated with the slurry, for example, the first process coating area 111 is the area to be coated 11 if the slurry is coated on the first process coating area 111; in another process, the second process coating region 112 is coated with the slurry, and the second process coating region 112 is the region 11 to be coated. The second process coating region 112 is disposed at a side of the first process coating region 111, wherein an active material paste may be coated on the first process coating region 111 to form an active material layer on the first process coating region 111, and an insulating paste may be coated on the second process coating region 112 to form an insulating layer on the second process coating region 112. Of course, the same surface of the substrate 10 may be provided with areas to which the slurry is applied by one step. On the same surface of the substrate 10, there may be provided areas to which the slurry is applied by three or four steps, respectively. In one coating process, the slurry is applied to only one type of the areas 11 to be coated. For convenience of description, the to-be-coated areas 11 refer to the areas to be coated with the slurry on the substrate 10 in one coating process. The back surface of the area to be coated 11 means the surface of the area to be coated 11 facing away from the coating roller 21.

The coating roll 21 is a roll body structure that can attach the paste 30 and can apply the attached paste 30 to the substrate 10 when contacting the substrate 10 of the pole piece. The roller body structure refers to a cylindrical rolling component which is used for rolling on the surface to realize mechanical actions such as moving, compressing, leveling, conveying and the like. The material of the roller body structure can be steel, rubber, plastic and the like. The coating roll 21 may pass through a tank provided with the slurry 30 or the slurry 30 may be sprayed onto the coating roll 21 so that the slurry 30 adheres to the coating roll 21, so that the slurry 30 on the coating roll 21 may be coated on the substrate 10 when the substrate 10 contacts the coating roll 21.

The coating roller 21 may rotate around its own axis, for example, an external driving mechanism such as a motor may be used to drive the coating roller 21 to rotate, or a transmission member such as a rotating shaft may be used to drive the coating roller 21 to rotate. Of course, a motor may be provided inside the coating roller 21 to drive the coating roller 21 to rotate. The coating roller 21 rotates so that the paste 30 is attached to the peripheral side surface thereof, and the paste 30 on the coating roller 21 is continuously coated on the substrate 10 during the transfer of the substrate 10.

The pressing roller 22 is a cylindrical structural member with an axial width adapted to the width of the area 11 to be coated, i.e., the pressing roller 22 has an axial width adapted to the width of the area to be coated with the slurry on the substrate 10 in one process. Referring to fig. 1 and fig. 4 together, if a press roller 22 is abutted against a first process coating area 111 during a coating process, the width of the press roller 22 along the axial direction is adapted to the width of the first process coating area 111; as another example, in a single coating process, when a pressure roller 22 is held against a second process coating region 112, the width of the pressure roller 22 in the axial direction is adapted to the width of the second process coating region 112. The press roll 22 may be made of steel, rubber, plastic, or the like. During the coating operation, the pressing roller 22 presses the surface of the region to be coated 11 on the substrate 10 facing away from the coating roller 21, so that at least a portion of the region to be coated 11 on the substrate 10 (i.e., a portion of the region to be coated 11 adjacent to the coating roller 21) protrudes toward a direction adjacent to the coating roller 21, so that the region to be coated 11 contacts the slurry 30 on the coating roller 21, and the coating roller 21 coats the slurry 30 on the region to be coated 11. The region 11 to be coated with the structure does not contact the end part of the coating roller 21, so that the slurry 30 on the end part of the coating roller 21 does not need to be scraped off, the slurry 30 on the end part of the coating roller 21 can be prevented from being hung on the region 11 to be coated to a certain extent, the thickness of the coated slurry 30 is more uniform, and the thickness consistency of the functional layer is improved.

In addition, by using the press rolls 22 of different widths, the slurry 30 of different widths can be coated on the substrate 10. Referring also to fig. 1, an active material layer may be applied to the substrate using a pressure roller 22 that is adapted to the width of the first process coating zone 111 on the substrate 10. As another example, an insulating layer may be applied to the substrate 10 using a pressure roller 22 that is adapted to the width of the second process coating zone 112 on the substrate 10.

In the technical solution of the embodiment of the present application, by arranging the pressing roller 22 to press the surface of the to-be-coated area 11 on the substrate 10 facing away from the coating roller 21, the to-be-coated area 11 on the substrate 10 can be protruded in the direction of the coating roller 21 and contacted with the coating roller 21, so that the slurry 30 on the coating roller 21 is coated on the to-be-coated area 11 of the substrate 10, so that only the slurry 30 on the peripheral side surface of the coating roller 21 corresponding to the to-be-coated area 11 can be coated on the to-be-coated area 11 of the substrate 10, and the slurry 30 on the end surface of the coating roller 21 does not need to be scraped off, thereby simplifying the structure, making the coated slurry 30 uniform and further improving the consistency of the thickness of the formed functional layer.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus includes a doctor blade 25 for scraping off a portion of the slurry 30 on the peripheral side of the coating roller 21, the doctor blade 25 being provided on the peripheral side of the coating roller 21.

Doctor blade 25 refers to a structure for scraping off a part of slurry 30 on the peripheral side surface of applicator roll 21. Doctor blade 25 may be provided in the shape of a block, a sheet, a long, or the like.

The doctor blade 25 is provided on the outer peripheral side of the coating roller 21, and the slurry 30 adhering to the peripheral side of the coating roller 21 is scraped off by the doctor blade 25 when the thickness thereof is greater than the distance from the doctor blade 25 to the peripheral side of the coating roller 21, so that the slurry 30 on the peripheral side of the coating roller 21 is uniform in thickness.

The doctor blade 25 is provided to scrape the slurry 30 on the peripheral side surface of the coating roller 21, so that the excessive slurry 30 on the peripheral side surface of the coating roller 21 can be scraped off, the slurry 30 on the peripheral side surface of the coating roller 21 is more uniformly distributed, the slurry 30 coated on the substrate 10 is further uniform, and the thickness consistency of the formed functional layer is further improved.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus may further include a bracket (not shown) to which the doctor blade 25 is mounted, so as to support the doctor blade 25 by the bracket, thereby facilitating installation and use of the doctor blade 25.

Referring to fig. 2, 3 and 4, in some embodiments, the position of the doctor blade 25 along the radial direction of the coating roller 21 is adjustable, so that the distance between the doctor blade 25 and the coating roller 21 can be adjusted according to the thickness of the coating paste 30 to control the thickness of the coating paste 30 on the coating roller 21, and thus the thickness of the coating paste 30 coated on the substrate 10, so as to control the thickness of the functional layer formed on the substrate 10.

In some embodiments, doctor blade 25 may be slidably mounted on a bracket, with the position of doctor blade 25 on the bracket being adjusted to adjust the distance between doctor blade 25 and applicator roll 21. Of course, a robot may be used to support the doctor blade 25, and the support position of the doctor blade 25 may be adjusted by the robot to adjust the distance between the doctor blade 25 and the application roller 21.

Referring to fig. 2, 3 and 4, in some embodiments, doctor blade 25 is disposed in a straight line adjacent one side of applicator roll 21.

Since doctor blade 25 controls the final distance between doctor blade 25 and coating roll 21 near one side of coating roll 21 when doctor blade 25 scrapes off excess slurry 30 on coating roll 21, the side of doctor blade 25 near coating roll 21 may also be referred to as the edge of doctor blade 25.

The blade of the scraper 25 is arranged in a straight line so as to facilitate processing and manufacturing, the structure of the scraper 25 can be simplified, the distance between the scraper 25 and the coating roller 21 can be conveniently controlled, the thickness of the sizing agent 30 on the coating roller 21 can be more conveniently controlled, the thickness consistency of the sizing agent 30 on the substrate 10 is improved, and the thickness consistency of a functional layer formed on the substrate 10 is further improved.

Referring to fig. 2, 3 and 4, in some embodiments, attachment grooves 211 are distributed on the circumferential side of the coating roller 21 at least at positions corresponding to the region 11 to be coated.

The attaching grooves 211 mean a pit or groove structure densely provided on the circumferential side surface of the coating roller 21 to make the corresponding area on the circumferential side surface of the coating roller 21 coarser to promote the attaching force thereof. The attachment recess 211 may be circular dimple-like, rectangular dimple-like, or other shapes.

The attaching grooves 211 are provided on the peripheral side surface of the coating roller 21 to promote the adhesion of the peripheral side surface of the coating roller 21 to the paste 30, so that the paste 30 is attached to the peripheral side surface of the coating roller 21, and the coating roller 21 coats the paste 30 on the substrate 10.

And the adhesion grooves 211 are provided at positions corresponding to at least the region 11 to be coated, so that the paste 30 can be well coated on the region 11 to be coated on the substrate 10.

The attaching grooves 211 are distributed on the coating roller 21 at least at positions corresponding to the areas 11 to be coated so as to attach the paste 30, thereby facilitating the coating of the paste 30 on the substrate 10.

Referring to fig. 2, 3 and 4, in some embodiments, the plurality of attaching grooves 211 on the circumferential side of the coating roller 21 may be formed in a mesh shape or a honeycomb shape.

Referring to fig. 2, 3 and 4, in some embodiments, the coating roller 21 is provided with attachment grooves 211 distributed over the entire circumferential side.

The coating roller 21 is provided with attachment grooves 211 distributed over the entire circumferential side, i.e. the coating roller 21 is provided with attachment grooves 211 over the entire circumferential side.

The attaching grooves 211 are distributed on the whole peripheral side surface of the coating roller 21, and the processing positions of the attaching grooves 211 are not needed to be considered, so that the processing and the manufacturing are facilitated. In addition, the arrangement does not need to correspond the distribution of the attaching grooves 211 to the area 11 to be coated, only the position of the press roller 22 is required to correspond to the area 11 to be coated, and the adjustment and the application are more convenient.

Referring to fig. 2, 3 and 4, in some embodiments, a plurality of press rolls 22 are provided, and the plurality of press rolls 22 are spaced apart.

Plural means two or more.

The plurality of press rolls 22 are provided, so that the slurry 30 can be simultaneously coated on a plurality of areas 11 to be coated on the substrate 10 to improve efficiency. Referring to fig. 1, for example, the slurry 30 may be applied to a plurality of first process coating regions 111 simultaneously to form a plurality of active material layers on the substrate 10. Of course, the slurry 30 may be applied simultaneously to a plurality of second step application regions 112 to form a plurality of insulating layers on the substrate 10.

In addition, since the plurality of press rolls 22 are used, each press roll 22 only needs to abut against the surface of the to-be-coated area 11 on the substrate 10 facing away from the coating roll 21, so that the to-be-coated area 11 protrudes to be in contact with the coating roll 21, that is, the slurry 30 can be coated, so that the manufacturing precision of each press roll 22 can be reduced, and particularly the press rolls 22 can be made of materials with certain elasticity such as rubber, silica gel and the like, so that the protruding height of the to-be-coated area 11 on the substrate 10 can be better adapted, thereby realizing the precision requirement of reducing the size of the press rolls 22 and reducing the cost.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus includes a support shaft 23, and the pressing roller 22 is mounted on the support shaft 23.

The support shaft 23 is an elongated or cylindrical shaft member for supporting an object.

The supporting shaft 23 is arranged so as to support the press roller 22, so that the press roller 22 is convenient to assemble and use, the distance between the support shaft 23 and the coating roller 21 can be adjusted so as to adjust the distance between the press roller 22 and the coating roller 21, the acting force of the press roller 22 against the base material 10 can be further adjusted, and the height of the region 11 to be coated on the base material 10 can be adjusted by jacking the press roller 22. Of course, in some embodiments, a frame may also be used to directly support the platen roller 22.

In some embodiments, the pressure roller 22 is movably mounted on the support shaft 23 in the axial direction of the support shaft 23.

The pressing roller 22 is movably mounted on the supporting shaft 23 along the axial direction of the supporting shaft 23, which means that the pressing roller 22 can move on the supporting shaft 23 along the axial direction of the supporting shaft 23.

The press roller 22 is movably arranged on the supporting shaft 23, so that the position of the press roller 22 can be conveniently adjusted, and the position of the press roller 22 can be set according to the position of the region 11 to be coated on the base material 10, so as to adapt to different pole piece processing requirements.

Referring to fig. 2, 3 and 4, in some embodiments, the applicator roll 21 is cylindrical or barrel-shaped.

The coating roller 21 is formed in a cylindrical shape or a cylindrical shape so as to facilitate processing and manufacturing. The coating roller 21 is provided in a cylindrical shape so as to be connected to an external rotation transmission member such as a gear, a rotation shaft, etc., so as to drive the coating roller 21 to rotate. The coating roller 21 is provided in a cylindrical shape to reduce the weight of the coating roller 21, and a driving member such as a driving motor may be conveniently installed in the coating roller 21 to drive the coating roller 21 to rotate.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus includes a reservoir 24 for storing a slurry 30, with portions of the coating roller 21 being located within the reservoir 24.

The reservoir 24 is a tank body having a receiving space.

The reservoir 24 is provided and a portion of the applicator roll 21 is positioned within the reservoir 24, the slurry 30 may be placed in the reservoir 24 such that a portion of the applicator roll 21 is immersed in the slurry 30 so that the slurry 30 may adhere to the applicator roll 21, and during rotation of the applicator roll 21, the slurry 30 adhering to the peripheral side of the applicator roll 21 is carried over to be coated on the substrate 10.

The reservoir 24 is provided and a portion of the applicator roll 21 is positioned within the reservoir 24 to facilitate not only the storage of the slurry 30, but also the attachment of the slurry 30 to the applicator roll 21. Of course, the slurry 30 may be attached to the peripheral side surface of the applicator roll 21 by spraying or sprinkling.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus includes a take-up roll 26 for winding the coated substrate 10.

The winding roller 26 refers to a shaft that is used to rotate to wind the coated substrate 10.

Since the substrate 10 is typically a roll of material having a relatively long length, and after coating, it is desirable to recover the roll for subsequent processing, a take-up roll 26 is provided to roll the coated substrate 10 for subsequent processing. In addition, due to the recovery of the substrate 10 by the winding roller 26, the release of the substrate 10 can be achieved to some extent due to its pulling action on the substrate 10.

The winding roller 26 is provided to transport and recover the substrate 10, and to facilitate the substrate 10 passing between the coating roller 21 and the pressing roller 22 to apply the slurry 30 to the substrate 10.

In some embodiments, the coating device includes a fulcrum for supporting the substrate web. The substrate roll is supported by the support shaft to facilitate the release of the substrate 10 to apply the paste 30 to the substrate 10 to form a corresponding functional layer. The support shaft is a shaft structure for supporting the coil stock.

In some embodiments, the fulcrum may be rotated by a motor or other drive to actively release the substrate 10. Of course, since the coating roller 21 and the pressing roller 22 clamp the substrate 10, the substrate 10 can be pulled by the rotation driving of the coating roller 21, so as to release and convey the substrate 10.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus includes a first pass roller 27 for supporting and guiding the movement of the substrate 10, the first pass roller 27 being disposed between the coating roller 21 and the winding roller 26.

The over roller means a structure of a cylindrical shaft for supporting and guiding the movement of the belt.

The first pass roller 27 is a pass roller that guides the movement of the substrate 10 after passing through the coating roller 21.

The first pass roller 27 is provided to provide a guiding and tensioning force to the substrate 10 output from between the coating roller 21 and the pressing roller 22 to return the coated substrate 10 to a flat state for collection.

Referring to fig. 2, 3 and 4, in some embodiments, the coating apparatus includes a second pass roller 28 for supporting and guiding the movement of the substrate 10, the second pass roller 28 being disposed on a side of the coating roller 21 remote from the winding roller 26.

The second pass roller 28 is a pass roller that directs the substrate 10 past the coating roller 21.

The provision of the second pass roller 28 provides guidance and tension to the substrate 10 entering between the applicator roller 21 and the pressure roller 22 so that the pressure roller 22 ejects the area 11 to be coated on the substrate 10 to contact the slurry 30 on the applicator roller 21 for coating.

Referring to fig. 2-4, some embodiments of the present application provide a coating apparatus for applying a slurry 30 to a substrate 10 of a pole piece. The coating device comprises a coating roller 21, a press roller 22, a liquid storage tank 24, a supporting shaft 23 and a scraper 25, wherein the liquid storage tank 24 is used for storing slurry 30, the coating roller 21 can rotate around the axis of the coating roller 21, and the coating roller 21 is used for attaching the slurry 30. Part of the applicator roll 21 is located in a reservoir 24. The pressing roller 22 is movably mounted on the supporting shaft 23 along the axial direction of the supporting shaft 23, and the pressing roller 22 is used for pressing the side, facing the coating roller 21, of the region 11 to be coated on the substrate 10, facing away from the coating roller 21. The doctor blade 25 is provided on the side of the coating roller 21, and the doctor blade 25 is provided in a linear shape near one side of the coating roller 21. Doctor blade 25 is used to scrape slurry 30 on the peripheral side of leveling applicator roll 21. The coating roller 21 is distributed with the attaching grooves 211 over the entire peripheral side surface.

Through with compression roller 22 movable mounting on back shaft 23 to adjust compression roller 22 along back shaft 23's position, the compression roller 22 of being convenient for corresponds with waiting to coat region 11 on the substrate 10, with to wait to coat region 11 to the direction jack-up of coating roller 21, and then be convenient for paste 30 on the coating roller 21 coats on waiting to coat region 11, need not to scrape the thick liquids 30 of coating roller 21 terminal surface, with the simplification structure, makes the thick liquids 30 of coating even, and then promotes the uniformity of the thickness of the functional layer that forms. The reservoir 24 is provided and a portion of the applicator roll 21 is positioned within the reservoir 24, the slurry 30 may be placed in the reservoir 24 such that a portion of the applicator roll 21 is immersed in the slurry 30 so that the slurry 30 may adhere to the applicator roll 21, and during rotation of the applicator roll 21, the slurry 30 adhering to the peripheral side of the applicator roll 21 is carried over to be coated on the substrate 10. The attaching grooves 211 are distributed on the whole peripheral side surface of the coating roller 21, so that the slurry 30 is attached to the peripheral side surface of the coating roller 21, and the processing positions of the attaching grooves 211 are not needed to be considered, so that the processing and the manufacturing are facilitated. It is also not necessary to correspond the distribution of the attaching grooves 211 to the region 11 to be coated, and it is only necessary to correspond the position of the pressing roller 22 to the region 11 to be coated. The scraper 25 is arranged, the cutting edge of the scraper 25 is arranged in a straight line shape, so that the processing and the manufacturing are convenient, the distance between the scraper 25 and the coating roller 21 is also convenient to control, the thickness of the sizing agent 30 on the coating roller 21 can be more conveniently controlled, the thickness consistency of the sizing agent 30 coated on the base material 10 is improved, and the thickness consistency of a functional layer formed on the base material 10 is further improved.

According to some embodiments of the application, the application further provides a pole piece production system, comprising the coating device according to any of the above schemes.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A coating apparatus for applying a slurry to a substrate of a pole piece, comprising:

The axial width of the press roller is matched with the width of the area to be coated on the base material, so that the press roller is used for pressing one side, back to the coating roller, of the area to be coated on the base material, and at least part of the area to be coated protrudes towards the direction close to the coating roller.

2. The coating apparatus according to claim 1, wherein the coating apparatus comprises a doctor blade provided on an outer peripheral side of the coating roller to scrape off a part of the slurry on the peripheral side of the coating roller.

3. The coating apparatus of claim 2, wherein the doctor blade is disposed in a straight line near a side of the coating roll.

4. A coating apparatus as in any one of claims 1-3, wherein attachment grooves are distributed on the peripheral side of the coating roller at least at positions corresponding to the areas to be coated.

5. The coating apparatus according to claim 4, wherein the attaching grooves are distributed over the entire peripheral side surface of the coating roller.

6. A coating apparatus as claimed in any one of claims 1 to 3, wherein a plurality of said press rolls are provided, a plurality of said press rolls being spaced apart.

7. A coating apparatus as claimed in any one of claims 1 to 3, wherein the coating apparatus comprises a support shaft, and the pressure roller is mounted on the support shaft and movable in the axial direction of the support shaft.

8. A coating apparatus as claimed in any one of claims 1 to 3, wherein the coating apparatus includes a reservoir for storing the slurry, a portion of the coating roller being located within the reservoir.

9. A coating apparatus according to any one of claims 1 to 3, wherein the coating apparatus comprises a winding roller for winding the coated substrate.

10. The coating apparatus of claim 9, wherein the coating apparatus comprises a first pass roller for supporting and guiding the movement of the substrate, the first pass roller being disposed between the coating roller and the winding roller.

11. The coating apparatus of claim 10, wherein the coating apparatus comprises a second pass roller for supporting and guiding the movement of the substrate, the second pass roller being disposed on a side of the coating roller remote from the take-up roller.

12. A pole piece production system comprising a coating device according to any one of claims 1-11.