A high-temperature resistant lithium battery separator coating equipment and process

Abstract

This invention provides a high-temperature resistant lithium battery separator coating equipment and process in the field of battery separator production technology, comprising: a dust removal section for removing dust from the coating surface of the substrate; and a trimming section for trimming the coated and dried substrate; characterized in that it further comprises: a coating section, wherein the coating section is disposed on one side of the dust removal section for pushing the coating onto the substrate surface, limiting the thickness of the coating flowing out in the forward direction, and using the coating flowing out in the reverse direction for pretreatment of the substrate surface; and a drying section, wherein the drying section is disposed between the coating section and the trimming section for first limiting and drying the coating on both sides and then drying the entire coating. This invention has advantages such as good coating penetration on the separator surface and uniform coating thickness.

Description

Technical Field

[0001] This invention relates to the field of battery separator production technology, and in particular to a high-temperature resistant lithium battery separator coating equipment and process. Background Technology

[0002] In the existing battery separator coating production process, different thicknesses of separator coatings need to be processed according to the requirements of the usage environment. The coating work is often completed by wet coating on the upper surface or the lower surface of the substrate. However, when the upper coating is applied, the coating is in a liquid state and has fluidity, so it tends to flow to both sides, which leads to a deviation from the pre-set thickness size and thus affects the uniformity of the coating thickness.

[0003] Chinese patent CN212943736U discloses a lithium battery separator coating device, including a coating table, a coating box welded to the outer wall of the top of the coating table, and a baffle connected to the coating table welded to the center of the inner wall of the top of the coating box. Four support columns are welded to the outer wall of the top of the coating box, and grooves are formed on the outer wall of the bottom of the support columns. Mounting blocks are slidably connected inside the grooves, and springs connected to the mounting blocks are welded to the inner wall of the top of the grooves. Pressure rollers are rotatably connected to the inner walls of two longitudinally adjacent mounting blocks on their adjacent sides via bearings.

[0004] However, although this technical solution can complete the coating work from the bottom side by using a coating roller located under the substrate, this method of coating is prone to uneven coating thickness and cannot be adjusted. Moreover, directly applying the coating to the substrate surface in a single application can easily result in poor adhesion to the substrate surface, leading to poor contact between the coating and the substrate. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-temperature resistant lithium battery separator coating equipment and process. After dust removal from the surface of the wound substrate by a dust removal unit, the substrate is arranged at an angle by an inclined guiding component. The coating is then extruded into a closed space formed by the extrusion component and the inclined guiding component. The coating flows along both the substrate conveying direction and the reverse direction. A pre-coating component evenly coats the substrate surface with the coating flowing in the reverse direction to achieve pre-penetration treatment. At the flow front end, a thickness treatment component rotates and scrapes off excess material, returning it to the extrusion component for recycling. A limiting belt simultaneously positions the edge of the coated coating and dries the edge. Subsequently, an overall drying component dries the entire width of the coating to ensure uniform coating thickness. Finally, a cutting section removes the uncoated edge areas of the substrate, thus solving the technical problems described in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-temperature resistant lithium battery separator coating equipment includes: a dust removal section for removing dust from the coating surface of a substrate; and a trimming section for trimming the coated and dried substrate; characterized in that it further includes: a coating section, which is located on one side of the dust removal section for pushing coating onto the substrate surface, limiting the thickness of the coating flowing out in the forward direction, and using the coating flowing out in the reverse direction for pretreatment of the substrate surface; and a drying section, which is located between the coating section and the trimming section for first limiting and drying both sides of the coating and then drying the whole coating.

[0008] Furthermore, the coating section includes: an oblique guiding component for obliquely guiding the substrate and moving and sealing the coating side of the substrate; an extrusion coating component, wherein the extrusion coating component is disposed between the oblique guiding components for extruding and coating the coating onto the surface of the substrate; a pre-coating component, wherein the pre-coating component is installed on one side of the extrusion coating component for pre-coating the coating onto the surface of the substrate after it flows obliquely downward through the extrusion coating component; and a thickness treatment component, wherein the thickness treatment component is disposed on the other side of the extrusion coating component for limiting the thickness of the coating that flows along the oblique surface of the substrate after being extruded by the extrusion coating component and for back-discharging excess coating back to the extrusion coating component.

[0009] Furthermore, the thickness processing assembly includes: a limiting seat, on one side of the bottom of the limiting seat having a liquid collection chamber; a limiting roller, which rotates in the opposite direction of the substrate movement to deliver excess paint into the liquid collection chamber and is located on one side of the bottom of the limiting seat; and a discharging assembly, which guides the paint delivered to the liquid collection chamber and reaching a predetermined height to the extrusion coating assembly and is installed in the middle of the liquid collection chamber.

[0010] Furthermore, the export component includes: a material-carrying roller with an obliquely arranged material-carrying chamber; a pusher slidably disposed in the material-carrying chamber; and a drive component, which drives the material-carrying roller to rotate while causing the pusher reaching the top side to push out the coating material from the material-carrying chamber. The drive component is installed on both sides of the material-carrying roller; the limiting seat has a flow channel communicating with the extrusion coating component.

[0011] Furthermore, the pre-coating assembly includes: scrapers that are obliquely inserted together and slide vertically; and a power assembly that drives the scrapers to move back and forth left and right, and causes the interposed scrapers to move back and forth vertically alternately; when the power assembly drives the scrapers to move to one side along the width direction of the substrate, one set of interposed scrapers is in a state of leaving the substrate surface, while the other set of scrapers is in contact with the substrate surface, and on the return trip, the other set of scrapers switches to leaving the substrate, so that the previously left scrapers contact the substrate surface.

[0012] Furthermore, the power assembly includes: a power base; a traction assembly, which is mounted on the power base to synchronously pull all the scrapers back and forth; and a guide rail, which is provided on the power base to guide the movement of adjacent scrapers in a synchronously moving state.

[0013] Furthermore, the extrusion coating assembly includes: an extrusion chamber located on the limiting seat and on one side of the liquid receiving chamber; an extrusion seat slidably disposed within the extrusion chamber and elastically connected to the extrusion chamber, the extrusion seat having a plurality of stepped channels for discharging coating material from the flow channel; a feeding assembly, the feeding assembly being installed on the inclined guiding assembly and connected to the extrusion chamber below the extrusion seat; and a pushing assembly, the pushing assembly being disposed above the extrusion seat for blocking the stepped channels and reciprocating downwards pushing the extrusion seat.

[0014] Furthermore, the drying unit includes: a side drying component and an overall drying component arranged sequentially along the substrate conveying direction; the side drying component limits the edge coating of the substrate after the coating part is applied and dries the edge; after the edge is dried, the overall drying component dries the substrate as a whole along the width direction.

[0015] Furthermore, the edge drying assembly includes: a limiting belt, the limiting belt having a triangular arrangement on its side surface and one side contacting the substrate surface, the limiting belt being obliquely disposed on both sides of the substrate; a belt driving assembly for driving the limiting belt, the belt driving assembly being obliquely arranged and in a state of being away from the substrate; and an edge drying unit arranged along the length direction of the substrate.

[0016] To achieve the above objectives, the present invention also provides a high-temperature resistant lithium battery separator coating equipment for the production of battery separators, characterized by comprising the following steps:

[0017] Step 1: Substrate cleaning. The substrate, after being wound up, is cleaned by the dust removal section before reaching the coating section.

[0018] Step 2: Extrusion coating. The substrate is obliquely conveyed by the oblique guiding component, and the extrusion coating component squeezes the coating onto the surface of the substrate. The coating will flow along the surface of the substrate towards the pre-coating component and the thickness treatment component respectively.

[0019] Step 3: Substrate pretreatment. The paint flowing out diagonally downwards is reciprocated back and forth along the width of the substrate by the pre-coating component. When moving to one side, one set of scrapers contacts the substrate surface and moves, while the other set of scrapers inserted together leaves the substrate surface. When returning, the two sets of scrapers exchange positions, and this process is repeated.

[0020] Step 4: Coating restriction. The coating material reaching the thickness processing component is pushed towards the bottom of the liquid receiving chamber by the rotating restriction roller. When the coating material below the discharge component reaches the predetermined height, the rotating carrying roller carries it to the side above it through the carrying chamber. The drive component then pushes the coating material out of the carrying chamber and into the extrusion coating component through the flow channel.

[0021] Step 5: Drying. After coating, the driving component drives the limiting belt to limit the coating along the width of the substrate. At the same time, the other side of the driving component and the limiting belt leaves the surface of the substrate. The edge of the positioned coating is dried by the edge drying unit and then dried as a whole by the overall drying component.

[0022] Step 6: Trim and rewind. After the uncoated area of ​​the dried substrate is positioned and trimmed by the trimming section, it is then rewound.

[0023] The beneficial effects of this invention are as follows:

[0024] (1) By cooperating with each other, the present invention can achieve coating treatment of a predetermined thickness while drying under the premise of controlling the fluidity of liquid coating, thereby further ensuring the uniformity of coating thickness.

[0025] (2) By cooperating with the coating part and the cutting part, the present invention can ensure that the substrate surface is uniformly coated while directly cutting off the excess and uncoated substrate edge part, thereby solving the technical problem of paint waste caused by uneven thickness of the edge due to the fluidity of the coating when the substrate edge is coated;

[0026] (3) The present invention can create a compression space for the coating by means of the cooperation between the oblique guiding component and the extrusion coating component, so that the coating flows only in the direction of substrate conveying and the opposite direction of conveying, so as to facilitate further processing of the outflowing coating while ensuring the adhesion of the coating to the substrate surface.

[0027] (4) Through the cooperation between the pre-coating component, the extrusion component, and the oblique guiding component, the present invention can achieve uniform pre-impregnation treatment of the substrate surface by the coating material flowing obliquely downward to the pre-coating component during extrusion, while the scraped part is guided downward and scraped evenly to one side.

[0028] (5) Through the cooperation between the thickness processing component, the oblique guiding component, and the extrusion coating component, the present invention can reduce the flow of the coating to the outside of the restricting roller under the oblique downward gravity. The excess coating can be carried by the discharge component and can be circulated and transferred to the extrusion coating component to achieve the reuse of excess coating.

[0029] (6) The present invention can achieve pre-positioning and pre-drying treatment of the edge coating by the cooperation between the edge drying component and the overall drying component, so that the edge coating is pre-shaped, thereby reducing the fluidity of the coating and making the surface thickness of the coating more uniform after drying.

[0030] (7) The present invention, through the side triangular structure design of the limiting band, can solve the problem that when positioning the coating, the other positions do not contact the substrate surface, thereby solving the problem of wear or stretching of the substrate surface caused by direct positioning and contact of the other parts with the substrate surface.

[0031] In summary, the present invention has the advantages of good coating penetration on the diaphragm surface and uniform coating thickness. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the coating part of the present invention;

[0034] Figure 3 This is an enlarged view of the structure of the coating part of the present invention;

[0035] Figure 4 This is a schematic diagram of the thickness processing component of the present invention;

[0036] Figure 5 This is an enlarged view of the thickness processing component of the present invention;

[0037] Figure 6 This is a schematic diagram of the material-carrying roller of the present invention;

[0038] Figure 7 This is a schematic diagram of the extrusion coating assembly of the present invention;

[0039] Figure 8 This is a structural layout diagram of the pre-coated component of the present invention;

[0040] Figure 9 This is a schematic diagram of the oblique guiding component of the present invention;

[0041] Figure 10 This is a schematic diagram of the pre-coated component of the present invention;

[0042] Figure 11 For the present invention Figure 10 A schematic diagram of the other side structure;

[0043] Figure 12 This is a schematic diagram of the drying section of the present invention;

[0044] Figure 13 For the present invention Figure 12 Enlarged view of point A in the middle;

[0045] Figure 14 This is a schematic diagram of the side drying component of the present invention;

[0046] Figure 15 This is an enlarged view of the structure of the side drying component of the present invention;

[0047] Figure 16 This is a schematic diagram of the drying process of the present invention;

[0048] Figure 17 This is a flowchart of the coating process of the present invention. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Example 1

[0052] like Figure 1As shown, a high-temperature resistant lithium battery separator coating equipment includes: a dust removal section 1 for removing dust from the coating surface of a substrate; and a trimming section 2 for trimming the coated and dried substrate; it also includes: a coating section 3, which pushes the coating onto the substrate surface, limits the thickness of the coating flowing out in the forward direction, and uses the coating flowing out in the reverse direction for pretreatment of the substrate surface; and a drying section 4, which first limits and dries the coating on both sides and then dries the entire coating, and is located between the coating section 3 and the trimming section 2.

[0053] It is easy to see from the above that in the process of coating lithium battery separators, the rolled substrate is continuously conveyed to the coating section 3 after being dusted by the dust removal section 1. In the coating section 3, while the coating is fully squeezed onto the surface of the substrate, as the coating moves toward the substrate in the conveying direction and the opposite direction, the coating is also pre-impregnated onto the substrate downstream, thereby ensuring the adhesion of the coating to the substrate and achieving uniformity when the coating is squeezed onto the surface of the substrate. Furthermore, the coating thickness is limited on one side of the front section of the extrusion coating, and the excess coating thickness is returned to achieve cyclic extrusion coating. After coating is completed, the drying section 4 first limits the edge position of the coating along both sides of the width direction and performs pre-drying treatment on the edges to solve the problem of uneven thickness caused by the coating flowing to both sides due to the fluidity of the coating. After the edges are dried, the whole is dried to ensure the uniformity of the overall coating. After drying, the edge of the uncoated substrate can be removed by the edge cutting section 2.

[0054] It is worth noting that the edge-cutting section 2 includes an edge-cutting machine and a winding roller for winding up the diaphragm. The edge-cutting machine and the winding roller are both existing technologies and will not be described in detail here.

[0055] It is also worth noting that the dust removal unit 1 includes a winding roller for winding the substrate and an ultrasonic dust collector, both of which are existing technologies and will not be described in detail here.

[0056] like Figure 2 and 8As shown, the coating section 3 includes: an oblique guiding component 31 that obliquely guides the substrate and moves to close the coating side of the substrate; an extrusion coating component 32, which is disposed between the oblique guiding components 31 to extrude and coat the coating onto the surface of the substrate; a pre-coating component 33, which is installed on one side of the extrusion coating component 32 to pre-coat the surface of the substrate with the coating that flows obliquely downward through the extrusion coating component 32; and a thickness treatment component 34, which is disposed on the other side of the extrusion coating component 32 to limit the thickness of the coating that flows along the oblique surface of the substrate extruded by the extrusion coating component 32 and to reverse the excess coating back to the extrusion coating component 32.

[0057] In this embodiment, the oblique guiding component 31 can be used to obliquely transport the substrate, thereby facilitating the flow of the extruded coating towards the pre-coating component 33 as much as possible, so as to facilitate the pre-coating of the substrate surface. Furthermore, when the thickness limiting component 34 is used to limit the thickness of the coating after extrusion, the oblique arrangement of the substrate and the gravity acting on the coating can also prevent the coating driven downstream by the thickness limiting component 34 from flowing back to its upstream side.

[0058] It is worth noting that the inclined guiding component 31 includes a guiding roller 311 located on one side of the bottom of the substrate and a closing component 312 located on both sides of the top of the substrate.

[0059] The sealing component 312 includes a synchronous sealing strip 3121 at the interface with the substrate surface and a sealing strip drive 3122 for driving the synchronous sealing strip 3121 to rotate.

[0060] In this embodiment, through the structural design of the sealing component 312, the synchronous sealing cover 3121 can be driven to rotate by a sealing belt drive 3122 driven by a roller drive, thereby achieving the simultaneous sealing of both sides of the substrate and the synchronous sealing belt 3121 moving synchronously with the substrate. This solves the problem of wear and traction deformation on the surface of the substrate when the substrate and the synchronous sealing belt 3121 move relative to each other.

[0061] like Figure 4-6 As shown, the thickness processing assembly 34 includes: a limiting seat 341, with a liquid collection chamber 3411 formed on one side of the bottom of the limiting seat 341; a limiting roller 342, which rotates in the opposite direction of the substrate movement to deliver excess paint into the liquid collection chamber 3411, and is located on one side of the bottom of the limiting seat 341; and a discharging assembly 343, which guides the paint delivered to the liquid collection chamber 3411 and reaching a predetermined height to the extrusion coating assembly 32, and is installed in the middle of the liquid collection chamber 3411.

[0062] In this embodiment, during the process of limiting the thickness of the coating material extruded onto the substrate surface, the thickness processing component 34 uses a servo motor to drive the limiting roller 342 to rotate, thereby pushing the excess coating material that exceeds the predetermined thickness to the bottom side of the liquid collection chamber 3411. As the amount of coating material in the liquid collection chamber 3411 increases, the export component 343 exports the excess coating material to the extrusion component 32, thereby ensuring that the amount of coating material in the liquid collection chamber 3411 is relatively stable. This ensures that the flow force of the coating material in the liquid collection chamber 3411 toward the limiting roller 342 is constant, solving the problem that when too much coating material is collected in the liquid collection chamber 3411, the flow force toward the limiting roller 342 is too large, causing the coating material to move out of the limiting roller 342 and resulting in an uneven coating surface.

[0063] like Figure 5 and 6 As shown, the export component 343 includes: a material-carrying roller 3431, on which an obliquely arranged material-carrying chamber 34311 is provided; a pusher 3432 slidably disposed in the material-carrying chamber 34311; and a drive component 3433, which drives the material-carrying roller 3431 to rotate while causing the pusher 3432 reaching the top side to push out the coating material in the material-carrying chamber 34311. The drive component 3433 is installed on both sides of the material-carrying roller 3431; and a flow channel 3412 communicating with the extrusion coating component 32 is provided on the limiting seat 341.

[0064] In this embodiment, the driving component 3433 can drive the pusher 3432, so that when the material carrying chamber 34311 moves to the top side of the liquid receiving chamber 3411, the pusher 3432 moves outward in the material carrying chamber 34311, thereby pushing out the coating material in the material carrying chamber 34311. The coating material will then flow through the flow channel 3412 to the extrusion coating component 32 for reuse.

[0065] It should be added that the drive assembly 3433 includes a drive seat 34331 mounted on the inclined guide assembly 31, a guide rail 34332 formed on the drive seat 34331 and having a raised shape on one side, and a guide rod 34333 with one end mounted on the pusher 3432 and the other end movably inserted into the guide rail 34322.

[0066] In this embodiment, the material-carrying roller 3431 is driven to rotate by a servo motor, and the material pusher 3432 also rotates accordingly. This causes the guide rod 34333 to rotate within the guide rail 34332. When it reaches the top side of the liquid collection chamber 3411, the guide rod 34333 enters the protruding side of the guide rail 34332, thereby pushing out the paint carried in the material-carrying chamber 34311 and flowing out through the flow channel 3412.

[0067] like Figure 10 and 11 As shown, the pre-coating component 33 includes: scrapers 331 that are obliquely inserted together and slide vertically; and a power component 332 that drives the scrapers 331 to move back and forth left and right, and causes the scrapers 331 that are inserted together to move back and forth vertically alternately. When the power component 332 drives the scrapers 331 to move to one side along the width of the substrate, one set of scrapers 331 that are inserted together is in a state of leaving the surface of the substrate, while the other set of scrapers 331 is in contact with the surface of the substrate. On the return trip, the other set of scrapers 331 switches to leaving the substrate, so that the scrapers 311 that left earlier come into contact with the surface of the substrate.

[0068] In this embodiment, after the extrusion coating component 32 has finished extruding the coating onto the substrate surface, when the extruded coating flows in the opposite direction to the movement of the substrate, the scraper 331 will be pushed and scraped downwards at an angle by the power of the power component 332, so that the coating can be uniformly pre-impregnated onto the substrate surface. That is, when the scraper 331 moves to one side, the scraper 331 tilted towards the side of the movement direction contacts the substrate surface, while the other set of scrapers 331 will leave the substrate, so as to ensure that when the scraper 331 is scraped to one side, the coating has a tendency to be uniformly distributed downwards, thereby realizing the continuous downward oblique driving of the coating onto the pre-impregnated fabric.

[0069] like Figure 10 As shown, the power assembly 332 includes: a power base 3321; a traction assembly 3322, which is installed on the power base 3321 to synchronously pull all the scraper pieces 331 to move back and forth; and a guide rail 3323, which is provided on the power base 3321 to guide the movement of adjacent scraper pieces 331 in a synchronously moving state.

[0070] In this embodiment, by using the pulling component 3322, when a set of scrapers 331 that are alternately slid and inserted can be pulled back and forth, another set of scrapers 331 will also move back and forth synchronously. When moving, the scrapers 331 will move up and down along the guide rail 3323, so that the scrapers 331 can move upward away from the substrate surface or downward to contact the substrate surface.

[0071] It should be added that the guide rail 3323 is in the shape of a parallelogram, and each inflection point of the parallelogram is equipped with a blocking clip inserted by a spring; the blocking clip can prevent the blocking clip from elastically contracting when the insertion end of the scraper 331 passes by, thereby achieving the blocking effect on the rail.

[0072] It should also be noted that the traction assembly 3322 includes a sliding groove 33221 formed on the power seat 3321, a traction block 33222 slidably disposed in the sliding groove 33221, a slide rod 33223 mounted on the scraper 331 and slidably inserted on the traction block 33222 at the other end, and a traction power component 33224 mounted on the power seat 3321 and connected to the traction block 33222 at its power end. The traction power component 33224 is preferably a cylinder.

[0073] like Figure 5 and 7 As shown, the extrusion coating assembly 32 includes: an extrusion chamber 321 located on the limiting seat 341 and on one side of the liquid receiving chamber 3411; an extrusion seat 322 slidably disposed in the extrusion chamber 321 and elastically connected to the extrusion chamber 321, the extrusion seat 322 having a plurality of stepped channels 3221 for discharging coating from the flow channel 3412; a feeding assembly 323 connected to the extrusion chamber 321 below the extrusion seat 322 and mounted on the inclined guiding assembly 31; and a pushing assembly 324, the pushing assembly 324 being disposed above the extrusion seat 322 for blocking the stepped channels 3221 and reciprocatingly pushing the extrusion seat 322 downward.

[0074] In this embodiment, when the coating component 32 applies the coating to the surface of the substrate, it continuously discharges the coating through the flow channel 3412 into the bottom side of the extrusion chamber 321 via the stepped channel 3221. Then, the coating is continuously fed into the extrusion chamber 321 by the feeding component 323, such as a screw extruder, which is located at the bottom side of the extrusion seat 322. As the pushing component 324 moves downward, it first blocks the stepped channel 3221 and then moves downward together with the extrusion seat 322, thereby creating extrusion pressure on the coating in the extrusion chamber 321 and applying the coating to the surface of the substrate.

[0075] like Figure 7 As shown, the extrusion assembly 324 includes a base 3241, an extrusion plate 3244 disposed below the base 3241, an extrusion motor 3242 mounted on the base 3241, an eccentric rod 3243 with one end eccentrically mounted on the power end of the extrusion motor 3242 and the other end connected to the extrusion plate 3244, and a stepped protrusion 3245 mounted on one side of the bottom of the extrusion plate 3244 and corresponding to the stepped channel 3221.

[0076] The push motor 3242 is preferably a servo motor.

[0077] It should also be noted that the compression seat 322 is connected to the inner wall of the inclined guiding component 31 via the first spring 3221, and a limiting block 3222 corresponding to the compression seat 322 is also provided on the top side of the compression seat 322 and on the side wall of the inclined guiding component 31.

[0078] Example 2

[0079] like Figure 12 and 16 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0080] The drying unit 4 includes: a side drying component 41 and an overall drying component 42 arranged sequentially along the substrate conveying direction; the side drying component 41 limits the edge coating of the substrate after the coating part 3 is applied and dries the edge; after the edge is dried, the overall drying component 42 dries the substrate as a whole along the width direction.

[0081] In this embodiment, the edge drying component 41 can be used to dry the edge of the coating first, and then the overall drying component 42 can be used to dry the entire coating. This method can solve the technical problem of uneven coating thickness caused by the fluidity of the liquid coating towards the periphery when it is not dried.

[0082] like Figure 14 and 15 As shown, the edge drying assembly 41 includes: a limiting band 411, the limiting band 411 having a triangular arrangement on its side surface and one side contacting the surface of the substrate, the limiting band 411 being obliquely disposed on both sides of the substrate; a belt driving assembly 412, the belt driving assembly 412 being obliquely disposed and in a state of being away from the substrate for driving the limiting band 411; and an edge drying unit 413 arranged along the length direction of the substrate.

[0083] In this embodiment, by driving the limiting band 411 with the driving component 412, the two sides of the coating can be limited, which solves the problem of the coating flowing to both sides. It also facilitates the pre-drying treatment of the coating edge by the edge drying unit 413 in the finishing state. The edge drying unit 413 is preferably a heating wire. Moreover, while limiting the edge position, the limiting band 411 arranged in a triangular shape can make one side of the limiting band 411 and the driving component 412 tilt to one side, which solves the technical problems such as wear or stretching of the substrate surface caused by continued contact with the substrate surface.

[0084] It should be added that a scraper (not shown in the figure) corresponding to the limiting band 411 is provided on one side of the drive assembly 412.

[0085] It should also be added that the belt drive assembly 412 includes a power base 4122 and a power roller 4121 mounted on the power base 4122, and the power roller 4121 is connected to the limiting belt 411 in a transmission connection.

[0086] It is worth noting that the power base 4122 can connect the power rollers 4121 through gears or other means, and drive them through a servo motor.

[0087] Example 3

[0088] like Figure 17 As shown, a high-temperature resistant lithium battery separator coating equipment is used for the production of battery separators, characterized by the following steps:

[0089] Step 1: Substrate cleaning. The rolled-up substrate is cleaned by the dust removal section 1 before reaching the coating section 3.

[0090] Step 2: Extrusion coating. The substrate is obliquely conveyed by the oblique guiding component 31, and the extrusion coating component 32 extrudes the coating onto the surface of the substrate. The coating will flow along the surface of the substrate towards the pre-coating component 33 and the thickness treatment component 34 respectively.

[0091] Step 3: Substrate pretreatment. The coating flowing out diagonally downwards is reciprocated by the pre-coating component 33 along the width of the substrate. When moving to one side, a set of scrapers 331 contacts the substrate surface and moves, while another set of scrapers 331 inserted together leaves the substrate surface. When returning, the two sets of scrapers exchange positions, and this process is repeated.

[0092] Step 4: Coating restriction. The coating material reaching the thickness processing component 34 is pushed towards the bottom side of the liquid receiving chamber 3411 by the rotating restriction roller 342. When the coating material below the discharge component 343 reaches a predetermined height, the rotating carrying roller 3441 carries it to the side above the carrying chamber 34311. The drive component 3433 causes the pusher 3432 to push the coating material out of the carrying chamber 34311 and flow into the extrusion coating component 32 through the flow channel 3412.

[0093] Step 5: Drying. After coating, the drive assembly 412 drives the limiting belt 411 to limit the coating along the width direction of the substrate. At the same time, the other side of the drive assembly 412 and the limiting belt 411 leaves the surface of the substrate. After the edge of the positioned coating is dried by the edge drying unit 413, it is dried as a whole by the overall drying assembly 42.

[0094] Step 6: Trim and roll up. After the uncoated area of ​​the dried substrate is positioned and trimmed by the trimming part 2, it is then rolled up.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature resistant lithium battery separator coating equipment, comprising: Dust removal unit for removing dust from the surface of a substrate coating; as well as A trimming section used for trimming coated and dried substrates; Its characteristic is that it further includes: The coating section, which pushes paint onto the substrate surface, limits the thickness of the paint flowing out in the forward direction, and uses the paint flowing out in the reverse direction for pretreatment of the substrate surface, is located on one side of the dust removal section; and The drying section, which first limits and dries the two sides of the coating and then dries the whole, is located between the coating section and the cutting section. The coating section includes: An oblique guiding component that obliquely guides the substrate and moves and seals the coating side of the substrate. The extrusion coating assembly, which extrudes and applies coating to the surface of a substrate, is disposed between the inclined guiding assemblies; A pre-coating assembly, wherein the coating material flowing obliquely downwards from the extrusion assembly onto the substrate surface is pre-coated onto the substrate surface, is mounted on one side of the extrusion assembly; and A thickness treatment component is provided on the other side of the extrusion coating assembly to limit the thickness of the coating material that flows along the inclined surface of the substrate and to back-discharge excess coating material to the extrusion coating assembly. The thickness processing component includes: A limiting seat, wherein a liquid receiving chamber is provided on one side of the bottom of the limiting seat; A limiting roller, rotating in the opposite direction of substrate movement to deliver excess coating into the liquid collection chamber, is located on one side of the bottom of the limiting seat; and The export component, which guides the coating material that has been delivered to the liquid collection chamber and reached a predetermined height, into the extrusion coating component, is installed in the middle of the liquid collection chamber; The exported components include: A material-carrying roller, wherein the material-carrying roller has a material-carrying chamber arranged at an angle; A pusher that is slidably disposed within the material carrying chamber; and The drive assembly, which drives the material-carrying roller to rotate and causes the pusher to push the coating out of the material-carrying chamber when it reaches the top side, is installed on both sides of the material-carrying roller. The limiting seat has a flow channel that communicates with the extrusion coating assembly.

2. The high-temperature resistant lithium battery separator coating equipment according to claim 1, characterized in that, The pre-coated component includes: Scrapers that are obliquely aligned and slidably inserted together vertically; and A power assembly that drives the scraper to move back and forth left and right, and causes the interlocking scrapers to move back and forth up and down alternately; When the power unit drives the scraper to move to one side along the width of the substrate, one set of scrapers that are interlocked with each other are in a state of leaving the substrate surface, while another set of scrapers is in contact with the substrate surface. On the return trip, the other set of scrapers switches to leaving the substrate, so that the scrapers that left earlier come into contact with the substrate surface.

3. The high-temperature resistant lithium battery separator coating equipment according to claim 2, characterized in that, The power assembly includes: Power unit; The traction assembly, which synchronously pulls all the scrapers back and forth, is mounted on the power base; and A guide rail, which guides the movement of adjacent scrapers in a synchronous moving state, is provided on the power base.

4. The high-temperature resistant lithium battery separator coating equipment according to claim 3, characterized in that, The extrusion coating assembly includes: A squeezing chamber is provided on the limiting seat and located on one side of the liquid receiving chamber; An extrusion seat is slidably disposed within the extrusion chamber and elastically connected to the extrusion chamber. The extrusion seat has several sets of stepped channels for the coating to flow out of the flow channel. A feeding assembly, connected to the extrusion chamber below the extrusion seat, is mounted on the inclined guiding assembly; and The pushing assembly, which blocks the stepped channel and reciprocates downwards to push the extrusion seat, is located above the extrusion seat.

5. The high-temperature resistant lithium battery separator coating equipment according to claim 4, characterized in that, The drying section includes: Side drying components and overall drying components are arranged sequentially along the substrate conveying direction; The edge drying component limits the coating on the edge of the substrate after coating and dries the edge. After the edge is dried, the overall drying component dries the entire substrate along the width direction.

6. The high-temperature resistant lithium battery separator coating equipment according to claim 5, characterized in that, The edge drying assembly includes: The limiting band, with its side surface arranged in a triangular shape and one side contacting the surface of the substrate, is obliquely disposed on both sides of the substrate. A drive assembly for driving the limiting band, the drive assembly being obliquely arranged and in a state away from the substrate; and Side drying unit arranged along the length of the substrate.

7. The process for producing battery separators using a high-temperature resistant lithium battery separator coating equipment according to claim 6, characterized in that, Includes the following steps: Step 1: Substrate cleaning. The substrate, after being wound up, is cleaned by the dust removal section before reaching the coating section. Step 2: Extrusion coating. The substrate is obliquely conveyed by the oblique guiding component, and the extrusion coating component squeezes the coating onto the surface of the substrate. The coating will flow along the surface of the substrate towards the pre-coating component and the thickness treatment component respectively. Step 3: Substrate pretreatment. The paint flowing out diagonally downwards is reciprocated back and forth along the width of the substrate by the pre-coating component. When moving to one side, one set of scrapers contacts the substrate surface and moves, while the other set of scrapers inserted together leaves the substrate surface. When returning, the two sets of scrapers exchange positions, and this process is repeated. Step 4: Coating restriction. The coating material reaching the thickness processing component is pushed towards the bottom of the liquid receiving chamber by the rotating restriction roller. When the coating material below the discharge component reaches the predetermined height, the rotating carrying roller carries it to the side above it through the carrying chamber. The drive component then pushes the coating material out of the carrying chamber and into the extrusion coating component through the flow channel. Step 5: Drying. After coating, the driving component drives the limiting belt to limit the coating along the width of the substrate. At the same time, the other side of the driving component and the limiting belt leaves the surface of the substrate. The edge of the positioned coating is dried by the edge drying unit and then dried as a whole by the overall drying component. Step 6: Trim and rewind. After the uncoated area of ​​the dried substrate is positioned and trimmed by the trimming section, it is then rewound.

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