An automated production line for battery separators

Abstract

This invention relates to the field of battery separator production technology, and in particular discloses an automated battery separator production equipment and production line, comprising: an unwinding device for supplying separators to be coated, a coating curing chamber, a coating chamber, and a winding device; the coating curing chamber has a film inlet opening and a film outlet opening at both ends, the film inlet opening being connected to the film outlet end of the coating chamber, the film outlet opening being located near the winding device, the winding device being used to recycle the coated and cured battery separator, the unwinding device being located near the film inlet end of the coating chamber, an air filter being provided at the top of the coating chamber, a support vertical plate being provided inside the coating chamber, a micro-gravure coating device and a slot coating device being provided on one side of the support vertical plate, and a spraying device being provided outside the micro-gravure coating device, thereby realizing automated production of battery separators, improving work efficiency, and allowing selection of coating methods according to production needs, thus expanding the applicability.

Description

Technical Field

[0001] This invention relates to the field of battery separator production technology, and in particular to an automated battery separator production equipment and production line. Background Technology

[0002] The lithium-ion battery separator is a porous thin film located between the positive and negative electrodes of a lithium-ion battery. It is one of the four main materials used in lithium-ion batteries. Its main function is to isolate the positive and negative electrodes, prevent short circuits, and ensure that lithium ions can pass through the micropores normally during charging and discharging to ensure normal battery operation. The performance of the separator has a significant impact on key indicators of lithium-ion batteries, such as internal resistance, capacity, cycle performance, charge and discharge current density, and safety.

[0003] The separator mainly serves two functions. First, it acts as an insulating layer, effectively preventing short circuits inside the lithium battery caused by contact between the positive and negative electrodes. Second, it acts as a semi-permeable layer, preventing larger molecules from passing through while allowing smaller charged ions to pass through. This increases the concentration difference near the positive and negative electrodes, facilitating ion diffusion and thus improving the storage efficiency of the lithium battery. For ease of packaging and transportation, separator raw materials are generally packaged into separator rolls. However, during the process of applying the separator to the lithium battery core, the rolled separator rolls must be unwound from the unwinding machine before the separator can be applied to the lithium battery core.

[0004] In the production process of battery separators, the base film needs to be placed in the coating station. A coating is applied to the surface of the base film to form an insulating and protective layer, giving the base film surface insulation and protection. However, most existing coating equipment adopts a segmented structure, and manual feeding or handling is mainly required during the drying, curing and transportation process, resulting in low production efficiency. Furthermore, manual handling during transportation can easily cause the separator material to not be kept straight, leading to coating peeling. Coated separators are mostly transported by rollers during the drying and transportation process, which also causes the coating to fall off. In addition, the existing coating equipment has a single coating method, which is difficult to adapt to different production process requirements. Moreover, during the coating process, the coating liquid is often in direct contact with the outside air. Particles in the gas can cause uneven coating, making it difficult to guarantee the production quality of battery separators.

[0005] Referring to Chinese invention patent publication number "CN111180640B" entitled "A Lithium-ion Battery Separator Spray Coating Production Equipment", it discloses "a lithium-ion battery separator spray coating production equipment, including a film loading device, an unwinding assembly, a tension adjustment assembly A, a film feeding traction assembly, a preheating assembly, an M-side coating assembly, an N-side spraying assembly, a tension adjustment assembly B, an oven assembly, a process traction assembly, a tension adjustment assembly C, a web guiding assembly, a detection assembly, a tension adjustment assembly D, a demagnetizing assembly, an electrostatic elimination assembly, a winding traction assembly, a winding assembly, and a film unloading device. The film loading device and the film unloading device include automatic lifting and automatic forward / backward devices. The unwinding assembly can be used with the M-side coating assembly and the N-side spraying assembly." The components achieve speed linkage control. The M-side coating component coats the membrane before the N-side spraying component, and the oven component can dry both sides of the membrane simultaneously. Although this technical solution can automate the production of battery separators and simultaneously dry both sides of the membrane to ensure coating drying effect, the coating method of this technical solution is singular. Although the spraying method can ensure coating saturation, it is only suitable for double-sided coating of battery separators. Furthermore, this spraying method cannot be used for single-sided coating of battery separators. It is difficult to ensure uniform coating when coating one side, and it cannot be adapted to different battery separator production process requirements. In addition, it cannot ensure the coating effect, thus affecting the production quality of battery separators.

[0006] Therefore, how to achieve fully automated production of battery separators is a technical problem that engineers need to solve. Summary of the Invention

[0007] The purpose of this invention is to provide an automated battery separator production equipment and production line to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an automated battery separator production equipment, characterized in that it comprises:

[0009] An unwinding device, a coating curing box, a coating box, and a rewinding device are used to supply the base film to be coated.

[0010] The coating curing box has a film inlet opening and a film outlet opening at both ends. The film inlet opening is connected to the film outlet end of the coating box and is located near the winding device. The coating curing box has an air outlet top cavity and an air outlet bottom cavity inside. The air outlet top cavity and the air outlet bottom cavity are movably located inside the coating curing box. Several strip-shaped air outlet top plates are arranged directly below the air outlet top cavity, and several strip-shaped air outlet bottom plates are arranged directly above the air outlet bottom cavity. The strip-shaped air outlet top plates and the strip-shaped air outlet bottom plates are staggered. The side of the air outlet top cavity and the air outlet bottom cavity opposite each other is used for the battery separator to pass through. The winding device is used to collect the battery separator after the coating has been cured. The unwinding device is located near the film inlet end of the coating box.

[0011] An air filter is installed on the top of the coating box, and the air outlet of the air filter is connected to the inner cavity of the coating box. A support vertical plate is installed inside the coating box. A micro-groove coating device and a slit coating device are respectively installed on one side of the support vertical plate, and the slit coating device is located directly above the micro-groove coating device. A spraying device is also installed outside the micro-groove coating device. Several guide rollers are installed on the support vertical plate, and the guide rollers are evenly distributed on the support vertical plate along the film conveying direction.

[0012] Preferably, the micro-grooving coating device includes a sliding plate and a coating arc plate. Both the coating arc plate and the sliding plate are slidably mounted on the supporting vertical plate. At least two pushing cylinders are provided on the supporting vertical plate. The power output ends of the two pushing cylinders are respectively connected to the outside of the sliding plate and the coating arc plate. A diaphragm roller is rotatably mounted on the sliding plate. The arc-shaped surface of the coating arc plate corresponds to the diaphragm roller. A liquid discharge scraper is provided on the inner arc surface of the coating arc plate. The liquid discharge scraper is aligned with the diaphragm roller.

[0013] Preferably, the slot coating device includes a transverse moving module and a fixed rotating roller. Both the transverse moving module and the fixed rotating roller are mounted on the support vertical plate, and one end of the transverse moving module is close to the fixed rotating roller. A coating extrusion head is provided on the moving end of the transverse moving module, and the liquid outlet end of the coating extrusion head faces the outside of the fixed rotating roller.

[0014] Preferably, the spraying device includes a liquid-blocking plate and a liquid-spraying plate. The side of the liquid-spraying plate opposite to the liquid-blocking plate is used for the base film to pass through. The side of the liquid-spraying plate facing the liquid-blocking plate is provided with a plurality of coating nozzles. The plurality of coating nozzles are evenly distributed along the length direction of the liquid-blocking plate and are used to spray out coating liquid.

[0015] Preferably, several strip-shaped air outlet top plates are evenly distributed along the length of the air outlet top cavity, and several strip-shaped air outlet bottom plates are evenly distributed along the length of the air outlet bottom cavity. The two ends of several strip-shaped air outlet top plates are respectively flush with the two sides of the air outlet top cavity, and the two ends of several strip-shaped air outlet bottom plates are respectively flush with the two sides of the air outlet bottom cavity.

[0016] Preferably, the strip-shaped top air outlet plate and the strip-shaped bottom air outlet plate are each provided with a plurality of hot air outlets on their opposite sides. The plurality of hot air outlets are evenly distributed on the opposite sides of the strip-shaped top air outlet plate and the strip-shaped bottom air outlet plate, and the hot air outlets are used to spray hot air.

[0017] Preferably, the exterior of the coating curing chamber is provided with a hot air inlet, which is connected to the top air outlet cavity and the bottom air outlet cavity respectively, and is used to supply hot air to the interior of the top air outlet cavity and the bottom air outlet cavity.

[0018] Preferably, the coating curing chamber is provided with a pressing mechanism and a lifting mechanism, and there are several pressing mechanisms and lifting mechanisms. Several pressing mechanisms are evenly arranged on the top of the coating curing chamber, and several lifting mechanisms are evenly arranged on the bottom of the coating curing chamber. The power output ends of several pressing mechanisms are connected to the top of the air outlet top cavity, and the power output ends of several lifting mechanisms are connected to the bottom of the air outlet bottom cavity.

[0019] Preferably, both the unwinding device and the winding device are provided with mounting plates on their exteriors, and static eliminators are provided on the mounting plates, with the static eliminators facing the base film.

[0020] Preferably, an adjustment device is provided outside the membrane outlet. The adjustment device includes a support plate and a correction roller. A connecting plate is provided on the support plate. An adjustment cylinder and a moving plate are respectively provided on the connecting plate. The moving plate is slidably disposed on the connecting plate. The power output end of the adjustment cylinder is fixedly connected to the outside of the moving plate. The correction roller is rotatably disposed on the moving plate. An infrared detector for obtaining the diaphragm coordinates is provided outside the connecting plate. The detection end of the infrared detector is close to the outside of the correction roller.

[0021] In another aspect, this application also provides an automated production line for battery separators, including the automated production equipment described in any of the above-mentioned claims;

[0022] Liquid return device and liquid supply device;

[0023] Both the liquid return device and the liquid supply device are located near the exterior of the coating box. The liquid supply device extends into the interior of the coating box and is connected to the liquid inlet of the slit coating device, the gravure coating device, and the spraying device. The liquid return device extends into the interior of the coating box and is connected to the liquid return of the gravure coating device, the slit coating device, and the spraying device. The liquid return device is connected to the liquid inlet of the liquid supply device.

[0024] Compared with the prior art, the present invention provides an automatic battery separator production equipment and production line, which has the following advantages: It includes an unwinding device for supplying the base film to be coated, a coating curing chamber, a coating chamber, and a winding device; the coating curing chamber has an inlet opening and an outlet opening at both ends, with the inlet opening connected to the outlet end of the coating chamber, and the outlet opening located near the winding device for recovering the coated and cured battery separator; the unwinding device is located near the inlet end of the coating chamber to facilitate the unwinding device conveying the base film into the coating chamber for coating, and the coated base film output from the coating chamber into the coating curing chamber for coating curing. The coating curing chamber is equipped with an air outlet top cavity and an air outlet bottom cavity, both of which are movably located inside the coating curing chamber. Several strip-shaped air outlet top plates are set directly below the air outlet top cavity, and several strip-shaped air outlet bottom plates are set directly above the air outlet bottom cavity. The strip-shaped air outlet top plates and strip-shaped air outlet bottom plates are staggered to ensure that the separator is subjected to uniform force. The side of the air outlet top cavity and the air outlet bottom cavity opposite each other is used for the battery separator to pass through. When the battery separator passes through, the coating liquid of the battery separator is cured by blowing air. Air can be blown on both sides of the battery separator at the same time, so that the battery separator is suspended between the air outlet top cavity and the air outlet bottom cavity, preventing the coating liquid from being scraped off and keeping the separator straight.

[0025] By installing an air filter at the top of the coating chamber and connecting its outlet to the inner cavity of the chamber, the air filter purifies the air inside the chamber, ensuring stable airflow output, preventing coating liquid contamination, and ensuring that the coating process is not affected by external factors. Inside the coating chamber, a support vertical plate is installed, with a micro-groove coating device and a slit coating device mounted on one side. The slit coating device is positioned directly above the micro-groove coating device. A spraying device is also installed outside the micro-groove coating device. Several guide rollers are evenly distributed along the film conveying direction on the support vertical plate to guide the base film. This allows for selection of the coating method according to production process requirements, solving the problem of limited coating methods in existing coating equipment. This invention effectively achieves fully automated production of battery separators, improving work efficiency and expanding its applicability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall external structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the overall internal structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the internal structure of the coating box and unwinding device in this invention.

[0030] Figure 4 This is a schematic diagram of the internal structure of the coating curing box in this invention.

[0031] Figure 5 This is a schematic diagram of the positioning device in this invention.

[0032] As indicated by the labels in the diagram: 1. Unwinding device; 2. Coating curing chamber; 3. Coating chamber; 4. Positioning device; 5. Rewinding device; 20. Hot air inlet; 21. Top air outlet cavity; 22. Bottom air outlet cavity; 23. Pressing mechanism; 24. Lifting mechanism; 30. Support vertical plate; 31. Air filter; 32. Micro-gravure coating device; 33. Slit coating device; 34. Spraying device; 35. Guide roller; 41. Support horizontal plate ; 42. Correcting roller; 43. Connecting plate; 44. Adjusting cylinder; 45. Moving plate; 46. Infrared detector; 211. Strip-shaped air outlet top plate; 221. Strip-shaped air outlet bottom plate; 321. Sliding plate; 322. Coating arc plate; 323. Pushing cylinder; 324. Diaphragm roller; 331. Lateral moving module; 332. Fixed roller; 333. Coating extruder head; 341. Liquid baffle plate; 342. Liquid spraying plate. Detailed Implementation

[0033] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. Although preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0034] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] In the description of this application, it should be understood that the terms "thickness," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. In addition, 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 technical features indicated. Thus, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly including one or more of the feature.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] The following is in conjunction with the appendix Figures 1 to 4 The technical solutions of the embodiments of this application are described in detail.

[0039] Example 1: To achieve automated production of battery separators, most existing coating equipment adopts a segmented structure. During the drying, curing, and transportation processes, manual feeding or handling is essential, resulting in low production efficiency. Furthermore, manual handling during transport can easily cause the separator material to become uneven, leading to coating peeling. To improve efficiency, this example includes: an unwinding device 1 for supplying the base film to be coated, a coating curing box 2, a coating box 3, and a winding device 5. The coating curing box 2 has an inlet opening and an outlet opening at both ends. The inlet is connected to the outlet of the coating box 3, and the outlet is located near the winding device 5. During production, the operator places the base film roll on the air shaft of the unwinding device 1, and the base film is unwound into the coating box 3 through the unwinding device 1. The coating unit inside the coating box 3 coats the base film surface, so that the coating liquid forms a coating on the base film surface. The coating curing box 2 then cures the coated base film to form a battery separator. Finally, the battery separator is recovered by the winding device 5, which effectively realizes the automated production of battery separators.

[0040] To further explain this embodiment, mounting plates are provided on the outside of both the unwinding device 1 and the winding device 5, and static elimination rods are mounted on the mounting plates, with the static elimination rods facing the base film. During the unwinding process of the unwinding device 1, the base film passes through the static elimination rods, thereby eliminating static electricity and removing dust from the surface of the base film. During the winding process of the winding device 5, the battery separator passes through the static elimination rods, thereby eliminating static electricity and removing dust from the surface of the battery separator.

[0041] In this embodiment, further specified, an adjustment device 4 is provided outside the membrane outlet. The adjustment device 4 includes a supporting horizontal plate 41 and a correction roller 42. A connecting plate 43 is provided on the supporting horizontal plate 41, and an adjustment cylinder 44 and a moving plate 45 are respectively provided on the connecting plate 43. The moving plate 45 is slidably disposed on the connecting plate 43, and the power output end of the adjustment cylinder 44 is fixedly connected to the outside of the moving plate 45. The correction roller 42 is rotatably disposed on the moving plate 45. Furthermore, a device for obtaining the diaphragm coordinates is provided outside the connecting plate 43. Infrared detector 46 is positioned so that its detection end is close to the outside of the correction roller 42. After the coating of the battery separator is cured in the coating and curing box, the battery separator is output through the exit opening. The infrared detector 46 obtains the coordinate position of the battery separator and moves the moving plate 45 on the connecting plate 43 through the adjusting cylinder 44 so that the correction roller 42 on the moving plate 45 can be aligned with the separator at the exit opening. This ensures that the battery separator will not shift position when it exits the exit opening and that it can enter the winding device 5 in a straight line.

[0042] In Example 2, to prevent coating detachment during the curing process of the battery separator and ensure uniform heating of the coating to improve curing efficiency, this example includes: an air outlet top cavity 21 and an air outlet bottom cavity 22 are respectively provided inside the coating curing chamber 2, both of which are movably disposed within the coating curing chamber 2. Furthermore, several strip-shaped air outlet top plates 211 are provided directly below the air outlet top cavity 21, and several strip-shaped air outlet bottom plates 221 are provided directly above the air outlet bottom cavity 22, so that the strip-shaped air outlet top plates... 211 and several strip-shaped air outlet base plates 221 are staggered to ensure that the battery separator is evenly stressed on both sides. The side of the air outlet top cavity 21 and the air outlet bottom cavity 22 opposite each other is used for the battery separator to pass through. The winding device 5 is used to recycle the battery separator after the coating has been cured. The unwinding device 1 is located near the film inlet end of the coating box 3. When the battery separator passes through, the coating liquid of the battery separator is blown and cured. Air can be blown on both sides of the battery separator at the same time, so that the battery separator is suspended between the air outlet top cavity 21 and the air outlet bottom cavity 22, preventing the coating liquid from being scraped off while keeping the separator straight.

[0043] In this embodiment, it should be noted that several strip-shaped air outlet top plates 211 are evenly distributed along the length direction of the air outlet top cavity 21, and several strip-shaped air outlet bottom plates 221 are evenly distributed along the length direction of the air outlet bottom cavity 22. The two ends of several strip-shaped air outlet top plates 211 are respectively flush with the two sides of the air outlet top cavity 21, and the two ends of several strip-shaped air outlet bottom plates 221 are respectively flush with the two sides of the air outlet bottom cavity 22. The hot air passage formed by the opposing sides of the top air outlet cavity 21 and the bottom air outlet cavity 22 allows the diaphragm to pass through simultaneously with hot air curing coating, ensuring uniform heating on both sides of the diaphragm and improving coating curing efficiency. Since the strip-shaped top air outlet plate 211 and the strip-shaped bottom air outlet plate 221 are staggered, uniform airflow from top to bottom is ensured, preventing wrinkles from forming on the diaphragm when it passes between the strip-shaped top air outlet plate 211 and the strip-shaped bottom air outlet plate 221. This ensures that the diaphragm remains straight during coating curing and that the coating is heated evenly.

[0044] In this embodiment, it should also be noted that by providing several hot air outlets on the opposite sides of the strip-shaped top air outlet plate 211 and the strip-shaped bottom air outlet plate 221, the hot air outlets are evenly distributed on the opposite sides of the strip-shaped top air outlet plate 211 and the strip-shaped bottom air outlet plate 221. The hot air outlets are used to spray hot air. When the diaphragm passes between the strip-shaped top air outlet plate 211 and the strip-shaped bottom air outlet plate 221, the hot air outlets can be used to perform hot air curing on both sides of the diaphragm to ensure that the coating on the diaphragm surface is heated evenly and to improve the coating curing efficiency.

[0045] It is particularly noteworthy that by providing a hot air inlet 20 on the outside of the coating curing chamber 2, and connecting the hot air inlet 20 to the top air outlet cavity 21 and the bottom air outlet cavity 22 respectively, hot air can be supplied to the inside of the top air outlet cavity 21 and the bottom air outlet cavity 22 through the hot air inlet 20. This allows the hot air to be output through the heat-sealed outlet ports of the strip-shaped top air outlet plate 211 and the strip-shaped bottom air outlet plate 221. The airflow achieves the effect of suspending the diaphragm, so that when the diaphragm is conveyed into the coating curing chamber, the coating will not directly contact the conveyor roller / conveyor belt, reducing the risk of the coating being scraped off before the coating is cured. This effectively ensures that the diaphragm coating is fully heated and improves the coating curing efficiency.

[0046] Example 3: To enable selection of coating methods based on production process requirements, existing coating equipment offers a single coating method, making it difficult to adapt to different production process needs. To improve applicability, this example includes: an air filter 31 installed at the top of the coating chamber 3, with its outlet connected to the inner cavity of the coating chamber 3; a support vertical plate 30 installed inside the coating chamber 3, with a micro-groove coating device 32 and a slit coating device 33 respectively installed on one side of the support vertical plate 30, and the slit coating device 33 positioned directly above the micro-groove coating device 32; a spraying device 34 installed outside the micro-groove coating device 32; and several guide rollers 35 evenly distributed along the film conveying direction on the support vertical plate 30. This allows for selection of coating methods based on production process requirements, solving the problem of the single coating method in existing coating equipment and improving applicability.

[0047] In this embodiment, it should be further explained that the air filter 31 can be a fan filter unit, and the fan speed can be adjusted to control the airflow, ensuring that a stable airflow can be maintained even under the condition of the final resistance of the high-efficiency filter. The air filter 31 effectively purifies the air inside the coating box 3, ensuring stable airflow output, preventing coating liquid contamination, and ensuring that the coating process is not affected by external factors.

[0048] In this embodiment, it should be further explained that the micro-grooving coating device 32 includes a sliding plate 321 and a coating arc plate 322. Both the coating arc plate 322 and the sliding plate 321 are slidably mounted on a supporting vertical plate 30. At least two pushing cylinders 323 are provided on the supporting vertical plate 30, and the power output ends of the two pushing cylinders 323 are respectively connected to the outside of the sliding plate 321 and the coating arc plate 322. A diaphragm roller 324 is rotatably mounted on the sliding plate 321, so that the arc surface of the coating arc plate 322 corresponds to the diaphragm roller 324. Furthermore, a liquid discharge scraper is provided on the inner arc surface of the coating arc plate 322, which is aligned with the diaphragm roller. With rollers 324 aligned, during the micro-gravure coating process, the movement distance of the sliding plate 321 and the coating arc plate 322 can be controlled by two push cylinders 323 respectively, so that the diaphragm roller 324 on the sliding plate 321 comes close to the liquid discharge scraper of the coating arc plate 322, so that the side of the base film to be coated on the diaphragm roller 324 is close to the liquid discharge scraper. The liquid discharge scraper performs micro-gravure coating on the side of the base film to be coated. During the micro-gravure coating process, by controlling the distance between the sliding plate 321 and the coating arc plate 322, the thickness of the coating can be controlled during the coating of extremely thin base films, which is suitable for coating of extremely thin base films.

[0049] In addition, during the micro-grooving process, in order to achieve the desired liquid discharge effect on the coating arc plate 322, a liquid outlet can be provided on the inner arc surface of the coating arc plate 322 and the liquid outlet can be placed close to the liquid discharge scraper to facilitate the output of coating liquid from the liquid outlet. The coating liquid flows onto the liquid discharge scraper and, when it comes into contact with the base film on the diaphragm roller 324, the side of the base film closest to the coating arc plate 322 is coated.

[0050] In this embodiment, it should be further noted that the aforementioned slit coating device 33 includes a transverse moving module 331 and a fixed rotating roller 332. Both the transverse moving module 331 and the fixed rotating roller 332 are mounted on the supporting vertical plate 30, with one end of the transverse moving module 331 close to the fixed rotating roller 332. A coating liquid extrusion head 333 is provided on the moving end of the transverse moving module 331, and the liquid outlet end of the coating liquid extrusion head 333 faces the outside of the fixed rotating roller 332. The fixed rotating roller 332 facilitates the application of the coating liquid. The membrane passes through, and the transverse movement module 331 controls the coating extrusion head 333 to approach the base film on the fixed roller 332 until the liquid outlet end of the coating extrusion head 333 abuts against the fixed roller 332. Then, the coating extrusion head 333 performs a slit coating action on the base film on the fixed roller 332. Since the amount of coating liquid discharged from the coating extrusion head 333 is uniform, it can continuously and uniformly coat the base film on the fixed roller 332. The slit coating method can effectively ensure the uniform coating thickness on the base film.

[0051] In addition, in order to supply liquid to the coating extrusion head 333, a liquid inlet pipe can be provided at the top of the coating extrusion head 333, and the coating liquid can be introduced into the interior of the coating extrusion head 333 through the liquid inlet pipe.

[0052] Regarding the above coating action, it is particularly important to note that, in order to prevent the coating liquid from dripping and contaminating the components inside the coating box 3 during the coating process, and to recover the residual liquid, several return liquid trays can be installed on the support vertical plate 30. These return liquid trays are placed close to the slit coating device 33, the micro-recession coating device 32, and the spraying device 34, respectively. Furthermore, the liquid receiving surfaces of the return liquid trays are all facing directly below the slit coating device 33, the micro-recession coating device 32, and the spraying device 34, so as to recover the residual liquid during slit coating.

[0053] In this embodiment, it should be added that the spraying device 34 includes a liquid-blocking plate 341 and a spraying plate 342. The side of the spraying plate 342 facing the liquid-blocking plate 341 is used for the base film to pass through. A plurality of coating nozzles are provided on the side of the spraying plate 342 facing the liquid-blocking plate 341. The plurality of coating nozzles are evenly distributed along the length direction of the liquid-blocking plate 341. The coating liquid is sprayed out through the plurality of coating nozzles. During the coating process of the base film by spraying, the coating liquid can be sprayed onto the base film through the coating nozzles of the spraying plate 342. When the base film passes between the spraying plate and the liquid-blocking plate 341, the coating liquid can be sprayed onto one side of the base film, ensuring that the coating on the base film is fully saturated, and the liquid-blocking plate 341 has the effect of blocking splashed spray liquid.

[0054] In addition, as mentioned above, to prevent residual liquid from dripping and contaminating parts during the spraying process, a groove for residual liquid to enter can be provided on the liquid baffle plate 341, and a drain hole for residual liquid to flow through can be provided at the bottom of the groove, so that the drain hole can be connected to the return tray.

[0055] Example 4, which is a detailed description of Example 2, describes how to automatically cure a base film with a coating. The lifting height of the top air outlet cavity 21 and the bottom air outlet cavity 22 is adjusted to accommodate base films and coatings of different thicknesses, ensuring sufficient and uniform heating. In this example, a pressing mechanism 23 and a lifting mechanism 24 are respectively installed inside the coating curing chamber 2. Several pressing mechanisms 23 and several lifting mechanisms 24 are provided. The pressing mechanisms 23 are evenly distributed at the top of the coating curing chamber 2, and the lifting mechanisms 24 are evenly distributed at the bottom. The power output ends of the pressing mechanisms 23 are connected to the top of the top air outlet cavity 21, and the power output ends of the lifting mechanisms 24 are connected to the bottom of the bottom air outlet cavity 22, thereby allowing for efficient and uniform heating. The pressing mechanism 23 controls the lifting height of the top air outlet cavity 21, and the lifting mechanism 24 controls the lifting height of the bottom air outlet cavity 22. When the power output end of the pressing mechanism 23 extends, the top air outlet cavity 21 moves closer to the bottom air outlet cavity 22. When the power output end of the pressing mechanism 23 retracts, the top air outlet cavity 21 moves closer to the top of the coating curing box 2. When the power output end of the lifting mechanism 24 extends, the bottom air outlet cavity 22 moves closer to the top air outlet cavity 21. When the power output end of the lifting mechanism 24 retracts, the bottom air outlet cavity 22 moves closer to the bottom of the coating curing box 2. Through the above actions, the distance between the top air outlet cavity 21 and the bottom air outlet cavity 22 can be controlled, so as to adjust the distance between the top air outlet cavity 21 and the bottom air outlet cavity 22 according to the actual production process requirements, so as to be suitable for coating curing of battery separators with different thicknesses.

[0056] Example 5, in conjunction with the above examples, to achieve continuous production of battery separators and to supply and recover residual liquid from the coating unit inside the coating box 3 during the production process, this example provides an automated battery separator production line, including the automated production equipment in any of the above examples, a liquid return device, and a liquid supply device. Both the liquid return device and the liquid supply device are located near the outside of the coating box 3. The outlet end of the liquid supply device extends into the interior of the coating box 3, so that the outlet end of the liquid supply device is connected to the slot coating device 33 and the micro-groove coating device, respectively. The liquid inlet of the coating device 32 and the spraying device 34 are connected one by one, and the liquid inlet of the return liquid device is extended into the interior of the coating box 3. By connecting the liquid inlet of the return liquid device to the return liquid ends of the micro-concave coating device 32, the slit coating device 33 and the spraying device 34 respectively, and connecting the liquid outlet of the return liquid device to the liquid inlet of the supply device, the residual liquid inside the coating box 3 can be recovered through the return liquid device, and the residual liquid can be supplied to the interior of the supply box, so as to realize the function of recovering the residual liquid for coating, realizing the residual liquid return and supply effect, and effectively preventing the waste of residual liquid.

[0057] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different emphases; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0058] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An automated production equipment for battery separators, characterized in that, include: An unwinding device, a coating curing box, a coating box, and a rewinding device are used to supply the base film to be coated. The coating curing chamber has a film inlet opening and a film outlet opening at both ends. The film inlet opening is connected to the film outlet end of the coating chamber and is located near the winding device. The coating curing chamber has an air outlet top cavity and an air outlet bottom cavity inside. Both the air outlet top cavity and the air outlet bottom cavity are movably disposed inside the coating curing chamber. Several strip-shaped air outlet top plates are arranged directly below the air outlet top cavity, and several strip-shaped air outlet bottom plates are arranged directly above the air outlet bottom cavity. The strip-shaped air outlet top plates and the strip-shaped air outlet bottom plates are staggered. The side of the air outlet top cavity and the air outlet bottom cavity opposite each other is used for the battery separator to pass through. The winding device is used to collect the battery separator after the coating has been cured. The unwinding device is located near the film inlet end of the coating chamber. An air filter is provided on the top of the coating box, and the air outlet of the air filter is connected to the inner cavity of the coating box. A support vertical plate is provided inside the coating box. A micro-groove coating device and a slit coating device are respectively provided on one side of the support vertical plate, and the slit coating device is located directly above the micro-groove coating device. A spraying device is also provided outside the micro-groove coating device. Several guide rollers are provided on the support vertical plate, and the several guide rollers are evenly distributed on the support vertical plate along the film conveying direction. Several strip-shaped air outlet top plates are evenly distributed along the length of the air outlet top cavity, and several strip-shaped air outlet bottom plates are evenly distributed along the length of the air outlet bottom cavity. The two ends of several strip-shaped air outlet top plates are respectively flush with the two sides of the air outlet top cavity, and the two ends of several strip-shaped air outlet bottom plates are respectively flush with the two sides of the air outlet bottom cavity. The coating curing chamber is equipped with a pressing mechanism and a lifting mechanism. There are several pressing mechanisms and several lifting mechanisms. Several pressing mechanisms are evenly distributed on the top of the coating curing chamber, and several lifting mechanisms are evenly distributed on the bottom of the coating curing chamber. The power output ends of several pressing mechanisms are connected to the top of the air outlet top cavity, and the power output ends of several lifting mechanisms are connected to the bottom of the air outlet bottom cavity. Both the unwinding device and the winding device are provided with mounting plates on their exteriors, and static eliminators are provided on the mounting plates, with the static eliminators facing the base film.

2. The automatic battery separator production equipment according to claim 1, characterized in that, The micro-concave coating device includes a sliding plate and a coating arc plate. Both the coating arc plate and the sliding plate are slidably mounted on the supporting vertical plate. At least two pushing cylinders are provided on the supporting vertical plate. The power output ends of the two pushing cylinders are respectively connected to the outside of the sliding plate and the coating arc plate. A diaphragm roller is rotatably mounted on the sliding plate. The arc-shaped surface of the coating arc plate corresponds to the diaphragm roller. A liquid discharge scraper is provided on the inner arc surface of the coating arc plate. The liquid discharge scraper is aligned with the diaphragm roller.

3. The automatic battery separator production equipment according to claim 1, characterized in that, The slot coating device includes a transverse moving module and a fixed rotating roller. Both the transverse moving module and the fixed rotating roller are mounted on the support vertical plate, and one end of the transverse moving module is close to the fixed rotating roller. A coating extrusion head is provided on the moving end of the transverse moving module, and the liquid outlet end of the coating extrusion head faces the outside of the fixed rotating roller.

4. The automatic battery separator production equipment according to claim 1, characterized in that, The spraying device includes a liquid-blocking plate and a liquid-spraying plate. The side of the liquid-spraying plate opposite to the liquid-blocking plate is used for the base film to pass through. The side of the liquid-spraying plate facing the liquid-blocking plate is provided with a plurality of coating nozzles. The plurality of coating nozzles are evenly distributed along the length direction of the liquid-blocking plate and are used to spray out coating liquid.

5. The automatic battery separator production equipment according to claim 1, characterized in that, The strip-shaped top and bottom air outlets are each provided with a number of hot air outlets on their opposite sides. The hot air outlets are evenly distributed on the opposite sides of the strip-shaped top and bottom air outlets and are used to spray hot air.

6. The automatic battery separator production equipment according to claim 1, characterized in that, The exterior of the coating curing chamber is provided with a hot air inlet, which is connected to the top air outlet cavity and the bottom air outlet cavity respectively. The hot air inlet is used to supply hot air to the interior of the top air outlet cavity and the bottom air outlet cavity.

7. The automatic battery separator production equipment according to claim 1, characterized in that, An adjustment device is provided outside the membrane outlet. The adjustment device includes a support plate and a correction roller. A connecting plate is provided on the support plate. An adjustment cylinder and a moving plate are respectively provided on the connecting plate. The moving plate is slidably mounted on the connecting plate. The power output end of the adjustment cylinder is fixedly connected to the outside of the moving plate. The correction roller is rotatably mounted on the moving plate. An infrared detector for obtaining the diaphragm coordinates is provided outside the connecting plate. The detection end of the infrared detector is close to the outside of the correction roller.

8. An automated production line for battery separators, characterized in that, Includes the automated production equipment as described in any one of claims 1 to 7; Liquid return device and liquid supply device; Both the liquid return device and the liquid supply device are located near the exterior of the coating box. The liquid outlet of the liquid supply device extends into the interior of the coating box, and the liquid outlet of the liquid supply device is connected to the liquid inlet of the slit coating device, the gravure coating device, and the spraying device, respectively. The liquid inlet of the liquid return device extends into the interior of the coating box, and the liquid inlet of the liquid return device is connected to the liquid return of the gravure coating device, the slit coating device, and the spraying device, respectively. The liquid outlet of the liquid return device is connected to the liquid inlet of the liquid supply device.

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