Coating equipment

Abstract

The invention relates to coating equipment. The coating equipment comprises a first unwinding assembly and a coating back roller, the first unwinding assembly is used for unwinding and outputting a to-be-coated material belt to the coating back roller, and the coating back roller is used for adsorbing, heating and drying the wound material belt; the coating assembly is arranged corresponding to the coating back roller and is used for coating the material belt wound around the coating back roller; the drying assembly comprises a drying back roller, the first air floating assembly is arranged between the coating back roller and the drying back roller and used for applying air floating force to a passing material belt in a non-contact mode, and under the action of the air floating force provided by the first air floating assembly, the material belt winding the coating back roller is conveyed to the drying back roller in a steering mode. The drying back roller is used for adsorbing, heating and drying the passing material belt; and the first winding assembly is used for winding the material belt reaching the downstream of the drying assembly.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing equipment, and specifically to a coating equipment. Background Art

[0002] Fuel cells are a clean and efficient energy conversion device that is widely used in new energy vehicles, drones, portable power sources and other fields. The basic components of a fuel cell are cathode plates, anode plates and membrane electrodes, which include carbon paper, catalyst layers and proton exchange membranes. Among them, the catalyst layer, as the core place where the electrochemical reaction occurs, directly affects the performance of the fuel cell. At the same time, the platinum in the catalyst layer accounts for a huge proportion of the manufacturing cost of the fuel cell. Therefore, the high-quality and low-cost mass production of the catalyst layer is the core of improving the performance of fuel cells and promoting the promotion of fuel cells.

[0003] The membrane electrode catalyst layer prepared by the catalyst coating method has close contact with the proton exchange membrane, better performance, higher catalyst utilization rate, and is suitable for automated production. It is the current mainstream technology for catalyst layer preparation. In the process of coating the anode catalyst layer using the catalyst coating method, in order to ensure good coating quality, the coating and drying of the anode catalyst layer need to be completed on a backing roller, which needs to have the characteristics of being able to adsorb the material belt, being heatable, and having high processing precision. Since too fast a drying speed will cause defects such as cracks in the catalyst layer, the drying speed cannot be increased indefinitely. Therefore, the drying capacity is the key factor restricting the improvement of the catalyst layer preparation efficiency and cannot meet the needs of high-speed coating. Summary of the invention

[0004] Based on this, it is necessary to provide a coating device that can improve the drying capacity to meet the needs of high-speed coating in order to address the above problems.

[0005] A coating device, comprising:

[0006] A first unwinding assembly and a coating back roller, wherein the first unwinding assembly is used to unwind the material strip to be coated to the coating back roller, and the coating back roller is used to adsorb and heat and dry the wound material strip;

[0007] A coating assembly, arranged corresponding to the coating backing roller, for coating the material strip passing around the coating backing roller;

[0008] A drying component and a first air flotation component, wherein the drying component includes a drying back roller, the first air flotation component is arranged between the coating back roller and the drying back roller, and is used to apply air flotation force to the passing material belt in a non-contact manner, and under the action of the air flotation force provided by the first air flotation component, the material belt passing around the coating back roller is diverted and transported to the drying back roller, and the drying back roller is used to adsorb and heat and dry the passing material belt; and

[0009] The first winding component is used to wind up the material belt that reaches the downstream of the drying component.

[0010] In some embodiments, the drying component includes N drying back rollers, the 1st, 2nd ... N-1th and Nth drying back rollers are arranged in sequence along a first preset direction, the drying component has a first side and a second side opposite to the first side in a second preset direction, and the first preset direction is perpendicular to the second preset direction; wherein N is a positive integer greater than or equal to 2;

[0011] Under the action of the air flotation force provided by the first air flotation component, the material belt passing through the coating back roller is turned and transported to the roller surface of the first drying back roller facing the first side, and passes through the roller surfaces of each drying back roller facing the first side in sequence along the first preset direction.

[0012] In some embodiments, the coating device further includes a second air flotation component, wherein the second air flotation component is disposed between each two adjacent drying backing rollers, and each of the second air flotation components is used to apply an air flotation force to the passing material strip in a non-contact manner;

[0013] Under the action of the air flotation force provided by the second air flotation assembly located between the Mth drying back roller and the M+1th drying back roller, the material belt is turned from the roller surface of the Mth drying back roller toward the first side to the roller surface of the M+1th drying back roller toward the first side; wherein M is a positive integer and M≤N.

[0014] In some embodiments, the material belt reaching the Nth drying back roller sequentially passes through the roller surfaces of each drying back roller facing the second side along a third preset direction, and the third preset direction is opposite to the first preset direction.

[0015] In some embodiments, the coating device further comprises a third air flotation component, wherein the third air flotation component is disposed between each two adjacent drying backing rollers, and each of the third air flotation components is used to apply an air flotation force to the passing material strip in a non-contact manner;

[0016] Under the action of the air flotation force provided by the third air flotation assembly located between the H+1th drying back roller and the Hth drying back roller, the material belt is turned from the roller surface of the H+1th drying back roller toward the second side to the roller surface of the Hth drying back roller toward the second side; wherein H is a positive integer and H≤N.

[0017] In some embodiments, the first air flotation assembly, the second air flotation assembly and the third air flotation assembly all include air flotation rollers, and the roller surfaces of the air flotation rollers blow air flows toward the passing material strips to apply the air flotation force.

[0018] In some embodiments, the first air flotation component, the second air flotation component and the third air flotation component further include a suction plate, an air flotation channel through which the material supply tape passes is formed between the suction plate and the air flotation roller, and the suction plate is used to generate adsorption force on the material tape passing through the air flotation channel.

[0019] In some embodiments, the suction plate has a curved adsorption surface on one side facing the air flotation channel that matches the roller surface shape of the air flotation roller, and the curved adsorption surface is provided with a plurality of adsorption holes for communicating with an external negative pressure source.

[0020] In some embodiments, the second air flotation assembly and the third air flotation assembly located between the Mth drying back roller and the M+1th drying back roller share the same suction plate, and the shared suction plate is arranged between the air flotation roller of the second air flotation assembly and the air flotation roller of the third air flotation assembly.

[0021] In some of the embodiments, at least two spacers are sleeved on the air flotation roller, and the spacers are spaced apart along the axial direction of the air flotation roller and respectively face the blank areas on the passing material strip that are not coated.

[0022] In some embodiments, the number of the spacers on the air floatation roller is adjustable; and / or

[0023] The position of the spacer ring on the air float roller is adjustable along the axial direction of the air float roller.

[0024] In some embodiments, the coating equipment also includes a second unwinding assembly and a second winding assembly, the second unwinding assembly is used to unwind the base film to the coating back roller so that the material strip and the base film are stacked on the coating back roller to form a composite material strip, and the base film is located between the material strip and the coating back roller; the second winding assembly is used to wind up the base film that arrives downstream of the drying assembly.

[0025] In some embodiments, the first unwinding assembly includes a first unwinding member and a first pressing roller, and the second unwinding assembly includes a second unwinding member and a second pressing roller;

[0026] The second unwinding member is used for unwinding and outputting a base film to the coating back roller, the second pressing roller is used for pressing the base film roll unwinding and outputting from the second unwinding member onto the coating back roller, the first unwinding member is used for unwinding and outputting a material strip to the coating back roller, the first pressing roller is used for pressing the material strip unwinding and outputting from the first unwinding member onto the base film on the coating back roller.

[0027] In some embodiments, the first winding assembly includes a first winding member and a first roller, and the second winding assembly includes a second winding member and a second roller;

[0028] The first passing roller and the second passing roller are both arranged on the side of the first drying back roller facing the second side, and are respectively used for winding the material strip and the base film in the passing composite material strip. The first winding member is used for winding the material strip wound around the first passing roller, and the second winding member is used for winding the base film wound around the second passing roller.

[0029] In the above-mentioned coating equipment, in the actual production process, the material strip unwound and output by the first unwinding component is wound around the coating back roller, the first air flotation component and the drying back roller in sequence, and finally wound onto the first winding component. When the material strip is wound around the coating back roller, the coating component coats the material strip on the coating back roller, so that the surface of the material strip facing away from the coating back roller is coated to form a coating, and then the material strip on the coating back roller is heated and dried. After the material strip on the coating back roller is coated and heated and dried, it is diverted and transported to the drying back roller under the action of the air flotation force provided by the first air flotation component. The function of the first air flotation component is to realize the diverting and conveying of the material strip without contacting the coating on the material strip, so as to avoid damaging the coating that is not completely dried. When the material strip is wound around the drying back roller, the drying back roller performs secondary heating and drying on the material strip on it, that is, after the material strip is coated, it is heated and dried once by the coating back roller, and then heated and dried twice by the drying back roller, thereby greatly increasing the path of the drying material strip and greatly improving the drying capacity of the coating equipment to better meet the needs of high-speed coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a coating device in one embodiment of the present application;

[0031] Figure 2 for Figure 1 The front view of the coating device shown (the frame portion is omitted);

[0032] Figure 3 for Figure 1 The schematic diagram of the structure of the coating back roller, the drying back roller and the first air flotation assembly of the coating equipment shown;

[0033] Figure 4 for Figure 3 A schematic structural diagram of the air flotation roller of the first air flotation assembly shown;

[0034] Figure 5 for Figure 3 A schematic structural diagram of the suction plate of the first air flotation assembly is shown. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0041] The present application provides a coating device for coating on one side surface of a material strip to be coated, and drying the coating on the material strip. It should be noted that the material strip to be coated may be a CCM (Catalyst Coated Membrane) material strip, and the coating device of the present application is used to coat on one side surface of the CCM material strip to form an anode catalyst layer. Of course, in other embodiments, the material strip to be coated may be other types of material strips, and the coating formed by coating may also be other types of coatings, which are not limited here. For ease of understanding, this article takes the material strip to be coated as a CCM material strip, and the coating formed by coating as an anode catalyst layer as an example for explanation.

[0042] See also Figure 1 and Figure 2 In the embodiment of the present application, the coating device includes a first unwinding assembly (not shown), a coating back roller 20, a coating assembly 30, a drying assembly 40, a first air flotation assembly 50 and a first winding assembly (not shown). The first unwinding assembly is used to unwind the CCM material strip A1 to be coated to the coating back roller 20. The coating back roller 20 is rotatable around its own axis and is used to adsorb and heat and dry the CCM material strip A1 that is wound around the coating back roller 20. The coating assembly 30 is arranged corresponding to the coating back roller 20 and is used to coat the CCM material strip A1 that is wound around the coating back roller 20. The drying assembly 40 includes a drying back roller 41, and the first air flotation assembly 50 is arranged between the coating back roller 20 and the drying back roller 41, and is used to apply an air flotation force to the CCM material strip A1 that is passing through in a non-contact manner. Under the action of the air flotation force provided by the first air flotation assembly 50, the CCM material strip A1 that is wound around the coating back roller 20 is turned and transported to the drying back roller 41. The drying back roller 41 is rotatable around its own axis and is used to adsorb and heat the CCM material strip A1 that is wound around. The first winding assembly is used to wind up the CCM material strip A1 that reaches the downstream of the drying assembly 40, that is, the traction force provided by the first winding assembly pulls the CCM material strip A1 unwound and output by the first unwinding assembly to wind around the coating back roller 20, the first air flotation assembly 50 and the drying back roller 41 in sequence.

[0043] Thus, in the actual production process, the CCM material strip A1 unwound by the first unwinding assembly is wound around the coating back roller 20, the first air flotation assembly 50 and the drying back roller 41 in sequence, and finally wound onto the first winding assembly. When the CCM material strip A1 is wound around the coating back roller 20, the coating assembly 30 coats the CCM material strip A1 on the coating back roller 20, so that the surface of the CCM material strip A1 facing away from the coating back roller 20 is coated to form the anode catalyst layer A11 (see Figure 3 ), and then the coating back roller 20 is used to heat and dry the CCM material strip A1 thereon. After the CCM material strip A1 on the coating back roller 20 is coated and heated and dried, it is then diverted and transported to the drying back roller 41 under the action of the air flotation force provided by the first air flotation component 50. The function of the first air flotation component 50 is to realize the diverting and conveying of the CCM material strip A1 without contacting the anode catalyst layer A11 on the CCM material strip A1, so as to avoid damaging the anode catalyst layer A11 that is not completely dried. When the CCM material strip A1 passes around the drying back roller 41, the drying back roller 41 performs secondary heating and drying on the CCM material strip A1 thereon, that is, after the CCM material strip A1 is coated, it is heated and dried once by the coating back roller 20, and then heated and dried twice by the drying back roller 41, thereby greatly increasing the path for drying the CCM material strip A1, and greatly improving the drying capacity of the coating equipment, so as to better meet the needs of high-speed coating.

[0044] It should be noted that the coating back roller 20 can achieve adsorption and fixation of the CCM material strip A1 by negative pressure adsorption. The coating back roller 20 can achieve heating and drying of the CCM material strip A1 by setting an electric heating element inside. Of course, in other embodiments, the coating back roller 20 can also transfer heat to the CCM material strip A1 by connecting a high-temperature medium (such as high-temperature water) to the inside of the coating back roller 20, as long as the heating and drying of the CCM material strip A1 can be achieved, and it is not limited here.

[0045] It should also be noted that the drying back roller 41 can achieve adsorption and fixation of the CCM material strip A1 by negative pressure adsorption. The drying back roller 41 can achieve heating and drying of the CCM material strip A1 by setting an electric heating element inside. Of course, in other embodiments, the drying back roller 41 can also transfer heat to the CCM material strip A1 by connecting a high-temperature medium (such as high-temperature water) to the inside of the drying back roller 41, as long as the heating and drying of the CCM material strip A1 can be achieved, and it is not limited here.

[0046] It should also be noted that the number of the drying backing rollers 41 can be one or more (i.e., two or more), which can be adjusted according to process requirements and is not limited here. The following is an example in which the number of the drying backing rollers 41 is N (N is a positive integer greater than or equal to 2).

[0047] The 1st, 2nd, ..., N-1th, and Nth drying back rollers 41 are arranged in sequence along the first preset direction X1. The drying assembly 40 has a first side a1 and a second side a2 opposite to the first side a1 in the second preset direction X2. The second preset direction X2 is perpendicular to the first preset direction X1. Under the action of the air flotation force provided by the first air flotation assembly 50, the CCM material belt A1 passing through the coating back roller 20 is turned and transported to the roller surface of the first drying back roller 41 facing the first side a1, and passes through the roller surfaces of each drying back roller 41 facing the first side a1 in sequence along the first preset direction X1. In this way, the CCM material strip A1 is turned and transported to the first drying back roller 41 under the action of the air flotation force provided by the first air flotation component 50, and then passes through the roller surface of each drying back roller 41 toward the above-mentioned first side a1 in sequence along the first preset direction X1, so that the CCM material strip A1 is heated and dried on each drying back roller 41 in sequence, further extending the drying path of the material strip, and further improving the drying capacity of the coating equipment to better meet the needs of high-speed coating.

[0048] Specifically in the embodiment, the coating device further includes a second air flotation component 60, and a second air flotation component 60 is disposed between each two adjacent drying back rollers 41. Each second air flotation component 60 is used to apply an air flotation force to the CCM material strip A1 passing through in a non-contact manner. Under the action of the air flotation force provided by the second air flotation component 60 located between the Mth drying back roller 41 and the M+1th drying back roller 41, the CCM material strip A1 is turned from the roller surface of the Mth drying back roller 41 facing the first side a1 to the roller surface of the M+1th drying back roller 41 facing the first side a1. Wherein, M is a positive integer, and M≤N. In this way, a second air flotation assembly 60 is arranged between every two adjacent drying back rollers 41, so that under the action of the air flotation force provided by the second air flotation assembly 60, the CCM material belt A1 is transported along the roller surface of the Mth drying back roller 41 toward the first side a1 for a distance, and then turned to be transported to the roller surface of the M+1th drying back roller 41 toward the first side a1, and then transported along the roller surface of the M+1th drying back roller 41 toward the first side a1, that is, the CCM material belt A1 passes through each drying back roller 41 in sequence on the first side a1 of the drying assembly 40.

[0049] It can be understood that the direction of the air flotation force provided by each second air flotation assembly 60 is from the first side a1 of the drying assembly 40 along the second preset direction X2 to the second side a2 of the drying assembly 40, so that the air flotation force provided by each second air flotation assembly 60 presses the passing CCM material belt A1 onto the roller surface of each drying back roller 41 facing the first side a1, ensuring that the contact area between the CCM material belt A1 and the roller surface of the drying back roller 41 facing the first side a1 is large enough, thereby further improving the drying capacity.

[0050] Furthermore, the CCM material strip A1 reaching the Nth drying back roller 41 sequentially passes through the roller surface of each drying back roller 41 toward the second side a2 along the third preset direction X3, and the third preset direction X3 is opposite to the first preset direction X1. In other words, the CCM material strip A1 sequentially passes through each drying back roller 41 along the first preset direction X1 on the first side a1 of the drying component 40, and then sequentially passes through each drying back roller 41 along the third preset direction X3 opposite to the first preset direction X1 on the second side a2 of the drying component 40, thereby further extending the drying path of the material strip and further improving the drying capacity.

[0051] Specific to Figure 2 In the embodiment shown, the first preset direction X1 is from left to right, the second preset direction X2 is from top to bottom, and the third preset direction X3 is from right to left. The first side a1 is the upper side of the drying component 40 , and the second side a2 is the lower side of the drying component 40 .

[0052] Furthermore, the coating device also includes a third air flotation component 70, and the third air flotation component 70 is disposed between each two adjacent drying back rollers 41. Each third air flotation component 70 is used to apply an air flotation force to the CCM material strip A1 passing through in a non-contact manner. Under the action of the air flotation force provided by the third air flotation component 70 located between the H+1th drying back roller 41 and the Hth drying back roller 41, the CCM material strip A1 is turned and transported from the roller surface of the H+1th drying back roller 41 toward the above-mentioned second side a2 to the roller surface of the Hth drying back roller 41 toward the above-mentioned second side a2. Wherein, H is a positive integer, and H≤N. In this way, the third air flotation assembly 70 is arranged between every two adjacent drying back rollers 41, so that under the action of the air flotation force provided by the third air flotation assembly 70, the CCM material belt A1 is transported along the roller surface of the H+1th drying back roller 41 toward the second side a2 for a distance, and then turns to be transported to the roller surface of the Hth drying back roller 41 toward the second side a2, and then continues to be transported along the roller surface of the Hth drying back roller 41 toward the second side a2, that is, the CCM material belt A1 passes through each drying back roller 41 in sequence on the second side a2 of the drying assembly 40.

[0053] It can be understood that the direction of the air flotation force provided by each third air flotation assembly 70 is from the second side a2 of the drying assembly 40 along the second preset direction X2 to the first side a1 of the drying assembly 40, so that the air flotation force provided by each third air flotation assembly 70 presses the passing CCM material belt A1 onto the roller surface of each drying back roller 41 facing the second side a2, ensuring that the contact area between the CCM material belt A1 and the roller surface of the drying back roller 41 facing the second side a2 is large enough, thereby further improving the drying capacity.

[0054] In the embodiment of the present application, the coating device further includes a second unwinding assembly (not labeled in the figure) and a second winding assembly (not labeled in the figure). The second unwinding assembly is used to unwind the bottom film A2 to the coating back roller 20, so that the CCM material strip A1 and the bottom film A2 are stacked on the coating back roller 20 to form a composite material strip A4, and the bottom film A2 is located between the CCM material strip A1 and the coating back roller 20. The second winding assembly is used to wind up the bottom film A2 that reaches the downstream of the drying assembly 40.

[0055] Thus, in actual use, the second unwinding assembly unwinds the bottom film A2 to the coating back roller 20, so that the bottom film A2 is wound around the coating back roller 20 (i.e., conveyed along the roller surface of the coating back roller 20). At the same time, the first unwinding assembly unwinds the CCM material strip A1 to be coated to the coating back roller 20, so that the CCM material strip A1 is attached to the bottom film A2 to form a composite material strip A4, and is wound around the coating back roller 20 together. When the composite material strip A4 wound on the coating back roller 20 passes through the coating assembly 30, the coating assembly 30 coats the catalyst slurry on the CCM material strip A1, thereby forming an anode catalyst layer A11 on the surface of the CCM material strip A1 on the side away from the bottom film A2. At the same time, the coating back roller 20 heats and dries the composite material strip A4 thereon. The coated composite tape A4 is turned and transported to the roller surface of the first drying back roller 41 facing the first side a1 under the action of the air flotation force provided by the first air flotation assembly 50, and then, under the action of the air flotation force provided by each second air flotation assembly 60, it is sequentially wound along the first preset direction X1 through the roller surface of each drying back roller 41 facing the first side a1. The composite tape A4 that has wound around the Nth drying back roller 41 is then transported to the second side a2 of the drying assembly 40 along the roller surface of the Nth drying back roller 41, and then, under the action of the air flotation force provided by each third air flotation assembly 70, it is sequentially wound along the third preset direction X3 through the roller surface of each drying back roller 41 facing the second side a2 until it reaches the roller surface of the first drying back roller 41 facing the second side a2. After the composite tape A4 reaches the roller surface of the first drying back roller 41 facing the second side a2, the CCM tape A1 in the composite tape A4 is wound up by the first winding assembly, and the base film A2 in the composite tape A4 is wound up by the second winding assembly.

[0056] It is understandable that by setting the bottom film A2, on the one hand, the bottom film A2 is used to support the CCM material strip A1, preventing the CCM material strip A1 from being overstretched and causing adverse effects on the coating quality; on the other hand, it prevents the CCM material strip A1 from directly contacting the coating back roller 20 and the drying back roller 41, effectively preventing the coating on the side of the CCM material strip A1 facing the bottom film A2 from being damaged. The bottom film A2 has a breathable function, so that the coating back roller 20 and the drying back roller 41 can absorb the bottom film A2 and the CCM material strip A1 in the composite material strip A4, ensuring that the bottom film A2 and the CCM material strip A1 in the composite material strip A4 are attached to the roller surface of the coating back roller 20 and the drying back roller 41.

[0057] Optionally, the first unwinding assembly includes a first unwinding member 11 and a first pressing roller 12, and the second unwinding assembly includes a second unwinding member 13 and a second pressing roller 14. The second unwinding member 13 is used to unwind and output the base film A2 to the coating back roller 20, and the second pressing roller 14 is used to roll the base film A2 unwinded by the second unwinding member 13 onto the coating back roller 20, so that the base film A2 is adsorbed and fixed on the coating back roller 20 and transported downstream as the coating back roller 20 rotates. The first unwinding member 11 is used to unwind and output the CCM material strip A1 to the coating back roller 20, and the first pressing roller 12 is used to press the CCM material strip A1 unwound by the first unwinding member 11 onto the base film A2 on the coating back roller 20, so that the CCM material strip A1 and the base film A2 are stacked to form a composite material strip A4 and are adsorbed and fixed by the coating back roller 20, so that the CCM material strip A1 and the base film A2 follow the rotation of the coating back roller 20 and are transported downstream together.

[0058] Of course, the CCM material strip A1 unwound and output by the first unwinding member 11 and the base film A2 unwound and output by the second unwinding member 13 are not limited to being compounded and adsorbed and fixed on the coating back roller 20. In other embodiments, the CCM material strip A1 unwound and output by the first unwinding member 11 and the base film A2 unwound and output by the second unwinding member 13 can be first combined and compounded to form a composite material strip A4, and then the composite material strip A4 is transported to the coating back roller 20 to be adsorbed and fixed, and then transported downstream together with the rotation of the coating back roller 20. As long as the CCM material strip A1 and the base film A2 can be adsorbed and fixed on the coating back roller 20 and passed through the coating component 30 downstream together, there is no limitation here.

[0059] Specifically in the embodiment, the first winding assembly includes a first winding member 91 and a first roller 92, and the second winding assembly includes a second winding member 93 and a second roller 94. The first roller 92 and the second roller 94 are both arranged on the side of the first drying back roller 41 facing the second side a2, and are respectively used for winding the CCM material strip A1 and the base film A2 in the composite material strip A4 passing through. The first winding member 91 is used to wind the CCM material strip A1 wound around the first roller 92, and the second winding member 93 is used to wind the base film A2 wound around the second roller 94. Thus, in actual use, the first winding member 91 winds up the CCM material strip A1, and the second winding member 93 winds up the base film A2, thereby applying traction forces to the CCM material strip A1 and the base film A2 respectively, so as to pull the composite material strip A4 to sequentially pass through the coating back roller 20, the first air flotation assembly 50, and sequentially pass through the roller surfaces of the drying back rollers 41 facing the first side a1 along the first preset direction X1 (that is, the composite material strip A4 sequentially passes through the roller surfaces of the first, second, ... Nth drying back rollers 41 facing the first side a1), and along the third preset direction X2. The direction X3 is sequentially wound around the roller surfaces of the drying back rollers 41 facing the second side a2 (i.e., the composite material strip A4 sequentially passes through the Nth drying back roller 41, the N-1th drying back roller 41 ... the second drying back roller 41 and the roller surface of the first drying back roller 41 facing the second side a2), and then the CCM material strip A1 and the base film A2 in the composite material strip A4 are separated, and the separated CCM material strip A1 is wound around the first passing roller 92 and then wound up by the first winding member 91, and the separated base film A2 is wound around the second passing roller 94 and then wound up by the second winding member 93.

[0060] It should be noted that, in order to protect the surface of the side of the CCM material strip A1 that needs to be coated, a layer of first protective film A3 is attached to the surface of the side of the CCM material strip A1 that needs to be coated. Therefore, the first protective film A3 needs to be removed before coating. In order to remove the first protective film A3 on the CCM material strip A1, in some embodiments, the coating equipment also includes a third winding member 15. After the CCM material strip A1 unwound and output by the first unwinding member 11 (the first protective film A3 is attached to the CCM material strip A1 at this time) is wound around the first pressure roller 12, the CCM material strip A1 is rolled onto the coating back roller 20 and is adsorbed and fixed. The first protective film A3 on the CCM material strip A1 is separated and wound by the third winding member 15.

[0061] See also Figures 3 to 5In the embodiment of the present application, the first air flotation assembly 50 includes an air flotation roller 51. When the composite material strip A4 passes through the air flotation roller 51, the air flotation roller 51 faces the side of the CCM material strip A1 coated with the anode catalyst layer A11. The roller surface of the air flotation roller 51 blows air flow toward the composite material strip A4 passing through and applies air flotation force to the composite material strip A4, so that the composite material strip A4 is tensioned and in a suspended state when passing through the air flotation roller 51, that is, it does not contact the air flotation roller 51, so as to avoid the air flotation roller 51 from causing damage to the anode catalyst layer A11 on the CCM material strip A1.

[0062] Specifically, the air flotation roller 51 has an air supply cavity for communicating with an external air source, and a plurality of air holes communicating with the air supply cavity are distributed on the roller surface of the air flotation roller 51. The gas provided by the external air source enters the air supply cavity of the air flotation roller 51, and the gas in the air supply cavity is ejected from each air hole to form an air flow, thereby achieving the effect of applying air flotation force to the composite material strip A4 passing through.

[0063] Furthermore, the first air flotation assembly 50 further includes a suction plate 52, and an air flotation channel is formed between the suction plate 52 and the air flotation roller 51 for the composite material strip A4 to pass through. The suction plate 52 is used to generate an adsorption force on the composite material strip A4 passing through the air flotation channel. In this way, when the composite material strip A4 passes through the air flotation channel, under the combined action of the air flotation force provided by the air flotation roller 51 and the adsorption force provided by the suction plate 52, the composite material strip A4 is tensioned and in a suspended state, that is, it does not contact the air flotation roller 51 and the suction plate 52.

[0064] It should be noted that the adsorption force provided by the suction plate 52 to the composite material strip A4 is in the same direction as the air flotation force provided by the air flotation roller 51. The adsorption force and the air flotation force act together on the composite material strip A4 passing through the air flotation channel, making the suspension state of the composite material strip A4 more stable and reliable.

[0065] Furthermore, at least two spacers 510 are sleeved on the air float roller 51, and each spacer 510 is arranged at intervals along the axial direction of the air float roller 51, and is respectively opposite to the uncoated blank area A12 on the CCM material strip A1 passing through. In this way, when the tension of the composite material strip A4 fluctuates, each spacer 510 is used to contact each blank area A12 of the CCM material strip A1, so as to support the composite material strip A4, and prevent the area of ​​the CCM material strip A1 coated with the anode catalyst layer A11 from contacting with the air float roller 51 and being damaged.

[0066] It should be noted that the coating assembly 30 performs multi-column coating on the CCM strip A1, that is, a plurality of columns of anode catalyst layers A11 are coated on the CCM strip A1 and arranged at intervals along the width direction of the CCM strip A1. The area between each two adjacent columns of anode catalyst layers A11 is not coated, and there are also uncoated areas of a certain width on both sides of the CCM strip A1 in the width direction, and the uncoated areas are blank areas A12.

[0067] Optionally, the number of spacers 510 on the air float roller 51 can be adjusted according to the number of blank areas A12 on the CCM material strip A1 to adapt to various types of CCM material strips A1 with different numbers of blank areas A12, greatly improving the compatibility of the device. For example, the coating assembly 30 coats the CCM material strip A1 to form three rows of anode catalyst layers A11. At this time, there are four blank areas A12 on the CCM material strip A1, so four spacers 510 can be set on the air float roller 51, and the four spacers 510 are respectively opposite to the four blank areas A12 on the CCM material strip A1 passing through.

[0068] Optionally, the position of the spacer 510 on the air float roller 51 is adjustable along the axial direction of the air float roller 51 to accommodate various types of CCM material strips A1 with different positions of the blank areas A12, thereby greatly improving the compatibility of the equipment.

[0069] Furthermore, the suction plate 52 has an arc-shaped adsorption surface 521 on the side facing the air flotation passage that matches the roller surface shape of the air flotation roller 51. The arc-shaped adsorption surface 521 is provided with a plurality of adsorption holes 523 for connecting with an external negative pressure source. In this way, the external negative pressure source extracts the air in each adsorption hole 523, so that negative pressure is generated at each adsorption hole 523, thereby generating an adsorption force on the composite material strip A4 passing through the air flotation passage.

[0070] It should be noted that the structures of the second air flotation assembly 60 and the third air flotation assembly 70 in the present application are similar to those of the first air flotation assembly 50 , and therefore they are not described in detail herein.

[0071] In some embodiments, the second air flotation assembly 60 and the third air flotation assembly 70 located between the Mth drying back roller 41 and the M+1th drying back roller 41 share the same suction plate 52, and the shared suction plate 52 is arranged between the air flotation roller 51 of the second air flotation assembly 60 and the air flotation roller 51 of the third air flotation assembly 70, that is, air flotation channels are formed between the air flotation roller 51 and the air flotation rollers 51 on opposite sides thereof, one of the air flotation channels is used for allowing the composite material strip A4 located on the first side a1 of the drying assembly 40 to pass through, and the other air flotation channel is used for allowing the composite material strip A4 located on the second side a2 of the drying assembly 40 to pass through. The common suction plate 52 has a curved adsorption surface 521 on one side of the air flotation roller 51 facing the second air flotation assembly 60, and also has a curved adsorption surface 521 on one side of the air flotation roller 51 facing the third air flotation assembly 70, so that the adsorption holes 523 on the two curved adsorption surfaces 521 are used to generate negative pressure respectively, thereby applying adsorption force to the composite material strip A4 passing through both sides of the common suction plate 52.

[0072] Of course, in other embodiments, the second air flotation assembly 60 and the third air flotation assembly 70 located between the Mth drying back roller 41 and the M+1th drying back roller 41 may not share the suction plate 52, that is, each second air flotation assembly 60 includes an independent suction plate 52, and each third air flotation assembly 70 also includes an independent suction plate 52, as long as it can achieve the effect of applying adsorption force to the composite material strip A4 passing through the air flotation channel, and no limitation is made here.

[0073] Please continue to see Figure 1 and Figure 2 As shown, in the embodiment of the present application, the coating device further comprises a frame 80, on which the coating back roller 20 and each drying back roller 41 are rotatably mounted around their respective axes. The air flotation roller 51 of the first air flotation assembly 50, the air flotation roller 51 of each second air flotation assembly 60 and the air flotation roller 51 of each third air flotation assembly 70 are rotatably mounted around their respective axes on the frame 80. The first unwinding member 11, the second unwinding member 13, the first winding member 91, the second winding member 93 and the third winding member 15 are all mounted on the frame 80.

[0074] Furthermore, the first unwinding assembly also includes a first driving member (not shown) mounted on the frame 80. The first pressing roller 12 is rotatably connected to the driving end of the first driving member around its own axis, and the first driving member is used to drive the first pressing roller 12 to move close to or away from the coating back roller 20. In this way, when the tape needs to be threaded, the first driving member drives the first pressing roller 12 to move away from the coating back roller 20, so that the first pressing roller 12 is separated from the coating back roller 20, so that the CCM material tape A1 unwound and output by the first unwinding member 11 passes between the first pressing roller 12 and the coating back roller 20. After the tape is threaded, the first driving member drives the first pressing roller 12 to move close to the coating back roller 20 until the first pressing roller 12 rolls the CCM material tape A1 onto the coating back roller 20. Optionally, the first driving member can be a cylinder.

[0075] Further, the second unwinding assembly also includes a second driving member (not shown) mounted on the frame 80. The second pressing roller 14 is rotatably connected to the driving end of the second driving member around its own axis, and the second driving member is used to drive the second pressing roller 14 to move close to or away from the coating back roller 20. In this way, when it is necessary to thread the belt, the second driving member drives the second pressing roller 14 to move away from the coating back roller 20, so that the second pressing roller 14 is separated from the coating back roller 20, so that the base film A2 unwound and output by the second unwinding member 13 passes between the second pressing roller 14 and the coating back roller 20. After the belt threading is completed, the second driving member drives the second pressing roller 14 to move close to the coating back roller 20 until the second pressing roller 14 rolls the base film A2 onto the coating back roller 20. Optionally, the second driving member can be a cylinder.

[0076] Furthermore, the first winding assembly also includes a third driving member 96 mounted on the frame 80. The first roller 92 is rotatably connected to the driving end of the third driving member 96 around its own axis, and the third driving member 96 is used to drive the first roller 92 to move closer to or away from the first drying back roller 41. In this way, when the tape needs to be threaded, the third driving member 96 drives the first roller 92 to move away from the first drying back roller 41, so that the first roller 92 is separated from the first drying back roller 41, which facilitates the composite material tape A4 to pass between the first roller 92 and the first drying back roller 41. After the tape is threaded, the third driving member 96 drives the first roller 92 to move closer to the first drying back roller 41 until the first roller 92 rolls the composite material tape A4 onto the first drying back roller 41. Optionally, the third driving member 96 can be a cylinder.

[0077] Furthermore, the coating device further includes a third unwinding member 95 mounted on the frame 80, and the third unwinding member 95 is used to unwind and output the second protective film A5 between the first passing roller 92 and the first drying back roller 41, so that the second protective film A5 is attached to the side of the CCM material strip coated with the anode catalyst layer A11 to protect the anode catalyst layer A11. It should be noted that in this embodiment, the CCM material strip rolled up by the first winding member 91 is attached with the second protective film A5 for protecting the anode catalyst layer A11.

[0078] Further, the second winding assembly also includes a fourth driving member 97 mounted on the frame 80. The second roller 94 is rotatably connected to the driving end of the fourth driving member 97 around its own axis, and the fourth driving member 97 is used to drive the second roller 94 to move close to or away from the first drying back roller 41. In this way, when the tape needs to be threaded, the fourth driving member 97 drives the second roller 94 to move away from the first drying back roller 41, so that the second roller 94 is separated from the first drying back roller 41, so that the bottom film A2 separated from the CCM material belt A1 can pass between the second roller 94 and the first drying back roller 41. After the tape is threaded, the fourth driving member 97 drives the second roller 94 to move close to the first drying back roller 41 until the second roller 94 rolls the bottom film A2 separated from the CCM material belt A1 onto the first drying back roller 41. Optionally, the fourth driving member 97 can be a cylinder.

[0079] Further, the coating assembly 30 includes a moving base 31 and a coating die 33. The moving base 31 is movably connected to the frame 80, and the coating die 33 is mounted on the moving base 31. The moving base 31 is used to drive the coating die 33 to move close to or away from the coating back roller 20 to adjust the gap between the coating die 33 and the coating back roller 20. In this way, when it is necessary to thread the tape, the moving base 31 drives the coating die 33 to move away from the coating back roller 20, so as to facilitate the composite material strip A4 to pass between the coating die 33 and the coating back roller 20. After the threading is completed, the moving base 31 drives the coating die 33 to move close to the coating back roller 20 until the gap between the coating die 33 and the composite material strip A4 on the coating back roller 20 is adjusted to meet the coating requirements, so that the coating die 33 can coat the CCM material strip A1 on the coating back roller 20 to form the anode catalyst layer A11.

[0080] Specifically in the embodiment, the coating device further includes a drying assembly 22 mounted on the frame 80. The drying assembly 22 includes at least one wind knife for blowing hot air to the composite material strip A4 wound around the coating back roller 20, so as to heat and dry the anode catalyst layer A11 on the CCM material strip A1 by using the hot air.

[0081] Furthermore, the drying assembly 22 includes an infrared dryer mounted on the frame 80, and the infrared dryer is used to dry the composite material strip A4 wound around the coating back roller 20, thereby achieving drying of the anode catalyst layer A11 on the CCM material strip A1.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A coating device, characterized in that: include: A first unwinding assembly and a coating back roller (20), wherein the first unwinding assembly is used to unwind the material strip to be coated onto the coating back roller (20), and the coating back roller (20) is used to adsorb and heat and dry the wound material strip; A coating assembly (30), arranged corresponding to the coating backing roller (20), and used for coating the material strip passing around the coating backing roller (20); a drying component (40) and a first air flotation component (50), wherein the drying component (40) comprises a drying back roller (41), the first air flotation component (50) being arranged between the coating back roller (20) and the drying back roller (41), and being used to apply air flotation force to a passing material belt in a non-contact manner, and under the action of the air flotation force provided by the first air flotation component (50), the material belt passing around the coating back roller (20) is diverted and transported to the drying back roller (41), and the drying back roller (41) is used to adsorb and heat and dry the passing material belt; and The first winding component is used to wind up the material belt that reaches the downstream of the drying component (40).

2. The coating device according to claim 1, characterized in that: The drying component (40) comprises N drying back rollers (41), wherein the first, second, ... N-1 and N drying back rollers (41) are arranged in sequence along a first preset direction (X1), and the drying component (40) has a first side (a1) and a second side (a2) opposite to the first side (a1) in a second preset direction (X2), and the first preset direction (X1) is perpendicular to the second preset direction (X2); wherein N is a positive integer greater than or equal to 2; Under the action of the air flotation force provided by the first air flotation component (50), the material belt passing around the coating back roller (20) is turned and transported to the roller surface of the first drying back roller (41) facing the first side (a1), and passes through the roller surfaces of each drying back roller (41) facing the first side (a1) in sequence along the first preset direction (X1).

3. The coating device according to claim 2, characterized in that: The coating device further comprises a second air flotation component (60), wherein the second air flotation component (60) is disposed between each two adjacent drying backing rollers (41), and each of the second air flotation components (60) is used to apply an air flotation force to the passing material strip in a non-contact manner; Under the action of the air flotation force provided by the second air flotation assembly (60) located between the Mth drying back roller (41) and the M+1th drying back roller (41), the material belt is turned from the roller surface of the Mth drying back roller (41) toward the first side (a1) to the roller surface of the M+1th drying back roller (41) toward the first side (a1); wherein M is a positive integer and M≤N.

4. The coating device according to claim 3, characterized in that: The material belt reaching the Nth drying back roller (41) sequentially passes through the roller surface of each drying back roller (41) toward the second side (a2) along a third preset direction (X3), and the third preset direction (X3) is opposite to the first preset direction (X1).

5. The coating device according to claim 4, characterized in that: The coating device further comprises a third air flotation component (70), wherein the third air flotation component (70) is disposed between each two adjacent drying backing rollers (41), and each of the third air flotation components (70) is used to apply an air flotation force to the passing material strip in a non-contact manner; Under the action of the air flotation force provided by the third air flotation assembly (70) located between the H+1th drying back roller (41) and the Hth drying back roller (41), the material belt is turned from the roller surface of the H+1th drying back roller (41) toward the second side (a2) and transported to the roller surface of the Hth drying back roller (41) toward the second side (a2); wherein H is a positive integer and H≤N.

6. The coating device according to claim 5, characterized in that: The first air flotation assembly (50), the second air flotation assembly (60) and the third air flotation assembly (70) all comprise an air flotation roller (51), and the roller surface of the air flotation roller (51) blows air flow toward the passing material belt to apply the air flotation force.

7. The coating device according to claim 6, characterized in that: The first air flotation component (50), the second air flotation component (60) and the third air flotation component (70) further include a suction plate (52), wherein an air flotation channel through which the material supply tape passes is formed between the suction plate (52) and the air flotation roller (51), and the suction plate (52) is used to generate adsorption force on the material tape passing through the air flotation channel.

8. The coating device according to claim 7, characterized in that: The suction plate (52) has a curved suction surface (521) on the side facing the air flotation channel that matches the roller surface shape of the air flotation roller (51), and the curved suction surface (521) is provided with a plurality of suction holes (523) for communicating with an external negative pressure source.

9. The coating device according to claim 7, characterized in that: The second air flotation assembly (60) and the third air flotation assembly (70) located between the Mth drying back roller (41) and the M+1th drying back roller (41) share the same suction plate (52), and the shared suction plate (52) is arranged between the air flotation roller (51) of the second air flotation assembly (60) and the air flotation roller (51) of the third air flotation assembly (70).

10. The coating device according to claim 6, characterized in that: At least two spacers (510) are sleeved on the air flotation roller (51), and each of the spacers (510) is arranged at intervals along the axial direction of the air flotation roller (51) and is respectively opposite to a blank area (A12) on the material strip that is passed by and is not coated.

11. The coating device according to claim 10, characterized in that: The number of the spacers (510) on the air floatation roller (51) is adjustable; and / or The position of the spacer (510) on the air float roller (51) is adjustable along the axial direction of the air float roller (51).

12. The coating device according to claim 4, characterized in that: The coating device also includes a second unwinding assembly and a second winding assembly, wherein the second unwinding assembly is used to unwind the base film (A2) to the coating back roller (20), so that the material strip and the base film (A2) are stacked on the coating back roller (20) to form a composite material strip (A4), and the base film (A2) is located between the material strip and the coating back roller (20); the second winding assembly is used to wind up the base film (A2) that reaches the downstream of the drying assembly (40).

13. The coating device according to claim 12, characterized in that: The first unwinding assembly comprises a first unwinding member (11) and a first pressing roller (12), and the second unwinding assembly comprises a second unwinding member (13) and a second pressing roller (14); The second unwinding member (13) is used to unwind the base film (A2) to the coating back roller (20), the second pressing roller (14) is used to press the base film (A2) unwinded by the second unwinding member (13) onto the coating back roller (20), the first unwinding member (11) is used to unwind the material strip to the coating back roller (20), and the first pressing roller (12) is used to press the material strip unwinded by the first unwinding member (11) onto the base film (A2) on the coating back roller (20).

14. The coating device according to claim 12, characterized in that: The first winding assembly comprises a first winding member (91) and a first passing roller (92), and the second winding assembly comprises a second winding member (93) and a second passing roller (94); The first passing roller (92) and the second passing roller (94) are both arranged on the side of the first drying back roller (41) facing the second side (a2), and are respectively used for winding the material strip and the base film (A2) in the passing composite material strip (A4); the first winding member (91) is used for winding the material strip wound around the first passing roller (92), and the second winding member (93) is used for winding the base film (A2) wound around the second passing roller (94).

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