Coating device, coating method and pole piece production system

Abstract

Some embodiments of the present application provide a coating device, a coating method and an electrode production system, the coating device includes a feeding mechanism, a detection mechanism, a controller and two rollers, the two rollers are arranged at intervals to form a roller gap, the feeding mechanism is used to convey materials from the upper side of the roller gap to the roller gap, the two rollers are used to roll the materials and form a film layer, the detection mechanism is arranged on the upper side of the roller gap and is used to detect the height of the materials accumulated on the upper side of the roller gap, the controller is connected to the detection mechanism and the feeding mechanism, and is used to adjust the amount of materials conveyed by the feeding mechanism. Since the controller is connected to the feeding mechanism for detecting the height of the materials accumulated on the upper side of the roller gap, the controller can adjust the amount of materials conveyed by the feeding mechanism according to the height of the materials on the upper side of the roller gap, so that the amount of materials conveyed by the feeding mechanism in the coating device can be automatically adjusted, the coating device has a high degree of automation, which is conducive to improving the convenience of film layer production in the electrode.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a coating device, a coating method and a pole piece production system. Background Art

[0002] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric tools, etc.

[0003] As the market demand for batteries continues to increase, the automation of the battery production process has attracted more and more attention from technicians in this field. Summary of the invention

[0004] In view of the above problems, the present application provides a coating device, a coating method and a pole piece production system, wherein the coating device can improve the convenience of the film layer production process in the pole piece.

[0005] In a first aspect, some embodiments of the present application provide a coating device, which includes a feeding mechanism, a detection mechanism, a controller and two rollers, wherein the two rollers are arranged at an interval, and a roller gap is formed between the two rollers; the feeding mechanism is used to transport materials from the upper side of the roller gap to the roller gap, and the two rollers are used to roll the materials and form a film layer; the detection mechanism is arranged on the upper side of the roller gap and is used to detect the height of the material accumulated on the upper side of the roller gap; the controller is connected to the detection mechanism and the feeding mechanism, and is used to adjust the amount of material transported by the feeding mechanism.

[0006] Since the controller is connected to the feeding mechanism and the device for detecting the height of the material accumulated on the upper side of the roller gap, the controller can adjust the amount of material transported by the feeding mechanism according to the height of the material on the upper side of the roller gap, so that the amount of material transported by the feeding mechanism in the coating device can be automatically adjusted. The coating device has a high degree of automation, which is conducive to improving the convenience of film layer production in the electrode.

[0007] According to the coating device provided in some embodiments of the present application, the feeding mechanism includes a material bin, a vibration motor and a material channel. The feed port of the material channel is located below the material bin, the discharge port of the material channel is located above the roller gap, the output end of the vibration motor is connected to the material channel, and the vibration motor is communicatively connected to the controller, so that the material channel can use the vibration transmitted by the vibration motor as power to drive the material to move, which not only enables the material to be transported smoothly, but also enables the material to be more evenly distributed on the upper surface of the material channel, which is beneficial to improving the stability of the feeding mechanism in transporting materials.

[0008] According to the coating device provided in some embodiments of the present application, the roller gap includes a forming area and an extrusion area, the extrusion area is arranged on both sides of the forming area along the arrangement direction of the two rollers, and the projection of the discharge port of the material channel in the vertical direction is located in the extrusion area. By making the projection of the discharge port of the material channel in the vertical direction located in the extrusion area, the material falling from the discharge port of the material channel can fall into the extrusion area, which not only allows the material to enter the forming area after passing through the rollers in the extrusion area, which helps to improve the compactness of the material accumulation, but also reduces the possibility of the feeding mechanism blocking the detection mechanism and other mechanisms.

[0009] According to the coating device provided in some embodiments of the present application, the projection of the detection mechanism is separated from the projection of the feeding mechanism in the vertical direction, which can reduce the possibility of the feeding mechanism blocking the detection mechanism and is beneficial to improving the accuracy of the detection results of the detection mechanism.

[0010] According to the coating device provided in some embodiments of the present application, the detection end of the detection mechanism is oriented in the vertical direction, and at least part of the projection of the detection end in the vertical direction is located in the roller gap. By arranging the detection end in the vertical direction and making at least part of the projection of the detection end in the vertical direction be located in the roller gap, it is helpful to improve the accuracy of the height of the material detected by the detection mechanism.

[0011] According to the coating device provided in some embodiments of the present application, the roller gap includes a forming area and an extrusion area, the extrusion area is arranged on both sides of the forming area along the arrangement direction of the two rollers, and at least part of the projection of the detection end in the vertical direction is located in the forming area. By locating at least part of the projection of the detection end in the vertical direction in the forming area, the detection end can be oriented toward the center of the accumulated material, which is conducive to further improving the accuracy of the height of the material detected by the detection mechanism.

[0012] In a second aspect, some embodiments of the present application provide a coating method, the coating method comprising:

[0013] The material is transported to the roller gap from above the roller gap between the two rollers;

[0014] Detect the height of the material accumulated on the upper side of the roller gap;

[0015] When the height of the material reaches a threshold, two rollers start to roll the material to form a film layer;

[0016] The amount of material delivered to the roller gap is adjusted according to the height of the material so that the height of the material is within a preset height range.

[0017] Through the above method, after obtaining the height information of the material, the amount of material conveyed to the roller gap is adjusted according to the height of the material, so that the height of the material is within the preset height range, so that the accumulated material can be better rolled by the roller, with a better rolling effect.

[0018] According to the coating method provided in some embodiments of the present application, the step of adjusting the amount of material delivered to the roller gap according to the height of the material so that the height of the material is within a preset height range includes:

[0019] When the height of the material is higher than the preset height range, the amount of material transported to the roller gap is reduced; when the height of the material is lower than the preset height range, the amount of material transported to the roller gap is increased.

[0020] According to the coating method provided in some embodiments of the present application, a material is conveyed to the roller gap by a feeding mechanism, and the feeding mechanism includes a vibration motor; the step of adjusting the amount of the material conveyed to the roller gap according to the height of the material so that the height of the material is within a preset height range includes:

[0021] The vibration frequency of the vibration motor is adjusted according to the height of the material to adjust the amount of material conveyed to the roller gap, so that the height of the material is within the preset height range. By adjusting the vibration frequency of the vibration motor to adjust the amount of material conveyed by the feeding mechanism to the roller gap, the material can be evenly distributed on the material channel to achieve the adjustment of the conveying amount.

[0022] According to the coating method provided in some embodiments of the present application, the step of adjusting the vibration frequency of the vibration motor according to the height of the material to adjust the amount of material conveyed to the roller gap so that the height of the material is within a preset height range includes:

[0023] Determine the correspondence between different vibration frequencies of the vibration motor and the height of the material;

[0024] When the height of the material is higher than the preset height range, the vibration motor changes to operate at a first vibration frequency, wherein the height of the material corresponding to the first vibration frequency is lower than the height of the material corresponding to the original vibration frequency; when the height of the material is lower than the preset height range, the vibration motor changes to operate at a second vibration frequency, wherein the height of the material corresponding to the second vibration frequency is higher than the height of the material corresponding to the original vibration frequency.

[0025] According to the coating method provided in some embodiments of the present application, the threshold is within a preset height range. By setting the threshold within the preset height range, when the height of the material reaches the threshold and the two rollers are started, the height of the material is within the preset height range, and the amount of material transported to the roller gap does not need to be adjusted immediately, which is conducive to the smooth operation of the coating device.

[0026] According to the coating method provided in some embodiments of the present application, a material is conveyed to the roller gap by a feeding mechanism, and the feeding mechanism includes a vibration motor; the step of adjusting the amount of the material conveyed to the roller gap according to the height of the material so that the height of the material is within a preset height range includes:

[0027] The amplitude of the vibration motor is adjusted according to the height of the material to adjust the amount of material conveyed to the roller gap so that the height of the material is within a preset height range.

[0028] In a third aspect, some embodiments of the present application provide a pole piece production system, which includes a coating device provided by any of the above-mentioned technical solutions, and the coating device is used to provide a film layer.

[0029] According to some embodiments of the present application, a pole piece production system is provided, which also includes two pressure rollers arranged at intervals, a rolling gap is formed between the two pressure rollers, the film layer is coated on the current collector and passes through the rolling gap, and the two pressure rollers are used to roll the film layer and the current collector to form a pole piece.

[0030] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0031] Some embodiments of the present application provide a coating device, which includes a feeding mechanism, a detection mechanism, a controller and two rollers, the two rollers are arranged at intervals to form a roller gap, the feeding mechanism is used to convey materials from the upper side of the roller gap to the roller gap, the two rollers are used to roll the materials and form a film layer, the detection mechanism is arranged on the upper side of the roller gap and is used to detect the height of the materials accumulated on the upper side of the roller gap, and the controller is connected to the detection mechanism and the feeding mechanism, and is used to adjust the amount of materials conveyed by the feeding mechanism. Since the controller is connected to the feeding mechanism for detecting the height of the materials accumulated on the upper side of the roller gap, the controller can adjust the amount of materials conveyed by the feeding mechanism according to the height of the materials on the upper side of the roller gap, so that the amount of materials conveyed by the feeding mechanism in the coating device can be automatically adjusted, and the degree of automation of the coating device is high, which is conducive to improving the convenience of film layer production in the electrode.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0034] Figure 1 A schematic diagram of the structure of a coating device provided in some embodiments of the present application;

[0035] Figure 2A schematic diagram of a coating method provided in some embodiments of the present application;

[0036] Figure 3 This is a schematic diagram of the process of step S4 in the coating method provided in some embodiments of the present application.

[0037] In the figure:

[0038] 1. Roller; 2. Feeding mechanism; 21. Material bin; 22. Vibration motor; 23. Material channel; 3. Detection mechanism; 4. Controller; 5. Roller gap; 51. Forming area; 52. Extrusion area. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0041] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0044] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0045] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0046] The term “plurality” used in this application refers to two or more (including two).

[0047] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0048] Coating is an essential process in the battery production process. The coating process has a very important impact on the quality of the battery, directly affecting the safety, capacity, life and other performance indicators of the battery. Coating is a method of coating a paste polymer, a molten polymer or a polymer melt on paper, cloth, or a plastic film to obtain a composite material (film). In the coating process of the pole piece, the coating device forms a film layer on the surface of the pole piece to give the pole piece good electrical properties.

[0049] As a coating process, the dry coating process usually uses a feeding mechanism to transport the material to the roller gap between two rollers so that the rollers can roll the material to form a film layer. In the prior art, the material discharge amount of the feeding mechanism is usually confirmed manually. After the operator confirms the material discharge amount, the material discharge amount is adjusted by adjusting the feeding mechanism. Since this method cannot grasp the discharge amount of the feeding mechanism in time, and cannot adjust the discharge amount of the feeding mechanism in real time, it not only makes the production of the film layer in the pole piece inconvenient and the degree of automation is low, but also due to the high level of human participation, there is a risk of accidents.

[0050] In order to improve the convenience of film production in the pole piece, some embodiments of the present application provide a coating device, which includes a feeding mechanism, a detection mechanism, a controller and two rollers, the two rollers are arranged at intervals to form a roller gap, the feeding mechanism is used to convey materials from the upper side of the roller gap to the roller gap, the two rollers are used to roll the materials and form a film layer, the detection mechanism is arranged on the upper side of the roller gap and is used to detect the height of the materials accumulated on the upper side of the roller gap, and the controller is connected to the detection mechanism and the feeding mechanism, and is used to adjust the amount of materials conveyed by the feeding mechanism. Since the controller is connected to the feeding mechanism for detecting the height of the materials accumulated on the upper side of the roller gap and the feeding mechanism, the controller can adjust the amount of materials conveyed by the feeding mechanism according to the height of the materials on the upper side of the roller gap, so that the amount of materials conveyed by the feeding mechanism in the coating device can be automatically adjusted, and the degree of automation of the coating device is high, which is conducive to improving the convenience of film production in the pole piece.

[0051] The coating device disclosed in the embodiment of the present application can be used for coating electrodes but is not limited to it. It can also be used for coating other films such as paper, cloth, plastic film, etc. to obtain a composite material (film), thereby obtaining a composite material (film) with certain properties.

[0052] The following is a further description of the technical solutions of the coating device, coating method and electrode production system provided in the specific implementation manner of the present application.

[0053] Some embodiments of the present application provide a coating device, referring to Figure 1 The coating device includes a feeding mechanism 2, a detection mechanism 3, a controller 4 and two rollers 1. The two rollers 1 are arranged at an interval, and a roller gap 5 is formed between the two rollers 1. The feeding mechanism 2 is used to transport materials from the upper side of the roller gap 5 to the roller gap 5. The two rollers 1 are used to roll the materials and form a film layer. The detection mechanism 3 is arranged on the upper side of the roller gap 5 and is used to detect the height of the materials accumulated on the upper side of the roller gap 5. The controller 4 is connected to the detection mechanism 3 and the feeding mechanism 2, and is used to adjust the amount of material transported by the feeding mechanism 2.

[0054] The roller 1 may refer to a cylindrical roller that can rotate around its own axis, and is used to roll the material that forms the film layer so that the material forms a film layer with self-supporting properties, so that the subsequent film layer and the current collector are laminated to form a pole piece.

[0055] By arranging two rollers 1 disposed at an interval, a roller gap 5 can be formed between the two rollers 1 , so that when the material passes through the roller gap 5 , it can be rolled by the two rollers 1 to form a film layer.

[0056] The feeding mechanism 2 may be a mechanism for conveying materials for forming a film layer to the roller gap 5. The feeding mechanism 2 may use a force to act on the materials to transport the materials. Exemplarily, the feeding mechanism 2 may be an air feeding mechanism 2, a belt feeding mechanism 2, or a vibration feeding mechanism 2.

[0057] By providing the feeding mechanism 2, the material can be stably fed to the roller gap 5 and accumulated under the feeding of the feeding mechanism 2, so that the roller 1 acts on the material. The feeding mechanism 2 feeds the material from the upper side of the roller gap 5 to the roller gap 5, and the discharge port of the feeding mechanism 2 can be located on the upper side of the roller gap 5, so that the material can fall to the roller gap 5 and accumulate under the action of gravity when discharged from the discharge port of the feeding mechanism 2.

[0058] The detection mechanism 3 may be a mechanism for measuring the material accumulated on the upper side of the roller gap 5, and is used to measure the height of the material accumulation. Exemplarily, the detection mechanism 3 may include a laser sensor or an ultrasonic sensor. Those skilled in the art may select the type of sensor included in the detection mechanism 3 according to actual conditions, so that the detection mechanism 3 can accurately measure the height of the material accumulation.

[0059] The controller 4 may be a device for adjusting the amount of material conveyed by the feeding mechanism 2. By connecting the controller 4 to the detection mechanism 3 and the feeding mechanism 2 in communication, the height information of the material measured by the detection mechanism 3 can be transmitted to the controller 4, so that the controller 4 can adjust the amount of material conveyed by the feeding mechanism 2 according to the height of the material on the upper side of the roller gap 5.

[0060] Exemplarily, the controller 4 can be a centralized or distributed controller 4. For example, the controller 4 can be a single single-chip microcomputer or can be composed of multiple distributed single-chip microcomputers. The control program can be run in the single-chip microcomputer to control the feeding mechanism 2 to realize its function.

[0061] In some embodiments, since the controller 4 is connected to the feeding mechanism 2 and is used to detect the height of the material accumulated on the upper side of the roller gap 5, the controller 4 can adjust the amount of material conveyed by the feeding mechanism 2 according to the height of the material on the upper side of the roller gap 5, so that the amount of material conveyed by the feeding mechanism 2 in the coating device can be automatically adjusted. The coating device has a high degree of automation, which is conducive to improving the convenience of film layer production in the electrode.

[0062] In some embodiments, the feeding mechanism 2 includes a silo 21, a vibration motor 22 and a material channel 23, the feed port of the material channel 23 is located below the silo 21, the discharge port of the material channel 23 is located above the roller gap 5, the output end of the vibration motor 22 is transmission-connected to the material channel 23, and the vibration motor 22 is communicatively connected to the controller 4.

[0063] The silo 21 may be a container for storing materials in the feeding mechanism 2, and it has a discharge port, and the silo 21 can stably provide materials to the material channel 23 through the discharge port. Exemplarily, the material used to form the film layer may be a powder material or a slurry material, and the specific state of the material can be set by those skilled in the art according to actual conditions.

[0064] The material channel 23 may be a channel for conveying materials. For example, the material channel 23 may be a plate-like structure or a belt-like structure, and the materials may be laid on the upper surface of the material channel 23 and move toward the roller gap 5 under the action of the material channel 23. By connecting the output end of the vibration motor 22 to the material channel 23, the material channel 23 can use the vibration transmitted by the vibration motor 22 as a power to drive the material to move, which not only enables the materials to be smoothly conveyed, but also enables the materials to be more evenly distributed on the upper surface of the material channel 23, which is conducive to improving the stability of the material conveying by the feeding mechanism 2.

[0065] By setting the feed port of the material channel 23 below the discharge port of the silo 21 and setting the discharge port of the material channel 23 above the roller gap 5, the material discharged from the discharge port of the silo 21 can enter the material channel 23 from the feed port of the material channel 23 and fall into the roller gap 5 from the discharge port of the material channel 23.

[0066] Since the vibration motor 22 is in communication connection with the controller 4, the operation state of the vibration motor 22 is controlled by the controller 4. Exemplarily, the operation state of the vibration motor 22 may refer to the vibration frequency or amplitude of the vibration motor 22, so that the controller 4 can adjust the amount of material conveyed by the feeding mechanism 2 by adjusting the operation state of the vibration motor 22.

[0067] In some embodiments, the roller gap 5 includes a forming area 51 and an extrusion area 52 . The extrusion area 52 is arranged on both sides of the forming area 51 along the arrangement direction of the two rollers 1 . The vertical projection of the discharge port of the material channel 23 is located in the extrusion area 52 .

[0068] The forming area 51 and the extrusion area 52 refer to different areas in the roll gap 5. The forming area 51 may be an area located on the upper side of the smallest distance between two adjacent rollers 1, and the extrusion area 52 may refer to an area arranged on both sides of the forming area 51 along the arrangement direction of the two rollers 1. The two rollers 1 are arranged in opposite directions of rotation, and the material is rolled and moved toward the forming area 51 by the action of the rollers 1 in the extrusion area 52 of the roll gap 5. After the material is acted on by the rollers 1 in the forming area 51, a film layer is formed from the lower side of the forming area 51.

[0069] By locating the vertical projection of the discharge port of the material channel 23 in the extrusion zone 52, the material falling from the discharge port of the material channel 23 can fall into the extrusion zone 52. This not only allows the material to enter the molding zone 51 after passing through the roller 1 in the extrusion zone 52, thereby helping to improve the compactness of the material stacking, but also reduces the possibility of the feeding mechanism 2 blocking the detection mechanism 3 and other mechanisms.

[0070] In some embodiments, along the vertical direction, the projection of the detection mechanism 3 is separated from the projection of the feeding mechanism 2 .

[0071] By setting the relative positions of the detection mechanism 3 and the feeding mechanism 2 so that the projection of the detection mechanism 3 along the vertical direction is separated from the projection of the feeding mechanism 2 along the vertical direction, the possibility of the feeding mechanism 2 blocking the detection mechanism 3 can be reduced, which is beneficial to improving the accuracy of the detection results of the detection mechanism 3.

[0072] In some embodiments, the detection end of the detection mechanism 3 is oriented in the vertical direction, and at least a portion of the projection of the detection end in the vertical direction is located in the roller gap 5 .

[0073] The detection end of the detection mechanism 3 may refer to the detection end of the sensor in the detection mechanism 3. By arranging the detection end in the vertical direction and making at least part of the projection of the detection end in the vertical direction located in the roller gap 5, it is helpful to improve the accuracy of the height of the material detected by the detection mechanism 3.

[0074] In some embodiments, the roller gap 5 includes a forming area 51 and an extrusion area 52 . The extrusion area 52 is arranged on both sides of the forming area 51 along the arrangement direction of the two rollers 1 . At least part of the projection of the detection end in the vertical direction is located in the forming area 51 .

[0075] As in the aforementioned solution, the forming area 51 may be an area located above the smallest distance between two adjacent rollers 1 , and the extrusion area 52 may refer to an area arranged on both sides of the forming area 51 along the arrangement direction of the two rollers 1 .

[0076] By locating at least a portion of the detection end projected in the vertical direction in the forming area 51 , the detection end can be oriented toward the center of the accumulated material, which is beneficial to further improve the accuracy of the height of the material detected by the detection mechanism 3 .

[0077] In some embodiments, the controller 4 is in communication connection with the roller 1, and the controller 4 is capable of adjusting the rotation speed of the film-forming roller.

[0078] By connecting the controller 4 to the roller 1 for communication, the rotation speed of the roller 1 is controlled by the controller 4, so that the controller 4 can adjust the rotation speed of the film-forming roller according to the height of the material accumulated on the upper side of the roller gap 5, so that the coating device can adjust the production speed of the film layer according to the amount of material delivered by the feeding mechanism 2.

[0079] In some embodiments, the rollers 1 in the coating device are arranged in pairs, and the two rollers 1 in each pair of rollers 1 are arranged at an interval to form a roller gap 5 between the two rollers 1 for rolling the material or the film layer.

[0080] Exemplarily, the rollers 1 in the coating device are arranged in multiple pairs in sequence, the first pair of rollers 1 is used to roll the material to form a film layer, and the subsequent pairs of rollers 1 are used to continue rolling the film layer to reduce the thickness of the thin film layer so that the film layer meets the requirements of the electrode.

[0081] Some embodiments of the present application also provide a coating method, referring to Figure 2 , the coating method comprises the following steps:

[0082] S1. Convey material from above the roller gap 5 between the two rollers 1 to the roller gap 5.

[0083] In the above step S1, the material is conveyed toward the roller gap 5 above the roller gap 5 between the two rollers 1, so that the material can fall from above to the upper side of the roller gap 5, and the material can be accumulated on the upper side of the roller gap 5, so that the two rollers 1 can drive the material into the roller gap 5 through relative rotation, so as to realize roller forming of the material to form a film layer.

[0084] As in the above technical solution, the material can be transported from the top of the roller gap 5 to the roller gap 5 through the feeding mechanism 2 .

[0085] S2. Detect the height of the material accumulated on the upper side of the roller gap 5.

[0086] In the above step S2, by detecting the height of the material accumulated on the upper side of the roller gap 5, the accumulation condition of the material on the upper side of the roller gap 5 can be detected, so as to facilitate subsequent timely adjustment to the accumulation condition of the material.

[0087] Exemplarily, the height of the material on the upper side of the roller gap 5 can be detected by the detection mechanism 3, so as to conveniently and timely know the height of the material accumulation.

[0088] S3. When the height of the material reaches a threshold, the two rollers 1 start and roll the material to form a film layer.

[0089] In the above step S3, by setting a threshold for the height of the material, the two rollers 1 will start and roll the material only when the height of the material reaches the threshold, so that when the rollers 1 roll the material, enough material can be accumulated in the roller gap 5, which is beneficial to reduce the possibility of material shortage during the rolling process.

[0090] When the two rollers 1 are started and roll the material, the material in the roller gap 5 moves to the area between the two rollers 1 and is squeezed under the action of the rollers 1, so that the material is rolled to form a film layer.

[0091] In some embodiments, the controller 4 can be connected to the roller 1 in communication, so that the controller 4 controls the roller 1 to start. Exemplarily, the controller 4 is connected to the roller 1 and the detection mechanism 3 in communication, so that when the detection mechanism 3 detects that the height of the material reaches a threshold, the controller 4 controls the roller 1 to start.

[0092] S4. Adjust the amount of material delivered to the roller gap 5 according to the height of the material so that the height of the material is within a preset height range.

[0093] In the above step S4, after obtaining the height information of the material, the amount of material conveyed to the roller gap 5 is adjusted according to the height of the material so that the height of the material is within the preset height range, so that the accumulated material can be better rolled by the roller 1 and has a better rolling effect.

[0094] Exemplarily, the adjustment of the amount of material conveyed by the roller gap 5 can be achieved by the controller 4 controlling the feeding mechanism 2 .

[0095] In some embodiments, the step of adjusting the amount of material delivered to the roller gap 5 according to the height of the material so that the height of the material is within a preset height range includes: when the height of the material is higher than the preset height range, reducing the amount of material delivered to the roller gap 5; when the height of the material is lower than the preset height range, increasing the amount of material delivered to the roller gap 5.

[0096] By reducing the amount of material delivered to the roller gap 5 when the height of the material is higher than the preset height range, the amount of material obtained at the roller gap 5 is reduced, while the roller 1 keeps rolling the material in its original state, so that as the roller 1 rolls the material into shape, the amount of deposited material continues to decrease, and the height of the deposited material gradually decreases to fall back to the preset height range.

[0097] By increasing the amount of material delivered to the roller gap 5 when the height of the material is lower than the preset height range, the amount of material obtained at the roller gap 5 is increased, and the roller 1 keeps the original state to roll the material, so that as the material is delivered to the roller gap 5, the amount of accumulated material continues to increase, and the height of the accumulated material gradually increases to within the preset height range.

[0098] In some embodiments, material is conveyed to the roller gap 5 by a feeding mechanism 2, and the feeding mechanism 2 includes a vibration motor 22; the step of adjusting the amount of material conveyed to the roller gap 5 according to the height of the material so that the height of the material is within a preset height range includes: adjusting the vibration frequency of the vibration motor 22 according to the height of the material to adjust the amount of material conveyed to the roller gap 5 so that the height of the material is within a preset height range.

[0099] As in the above technical solution, the feeding mechanism 2 is a mechanism for conveying materials for forming a film layer to the roller gap 5. By making the feeding mechanism 2 include a vibration motor 22, the feeding mechanism 2 can convey materials by means of vibration force.

[0100] In this step, the amount of material delivered by the feeding mechanism 2 to the roller gap 5 is changed by adjusting the vibration frequency of the vibration motor 22, so that the height of the material can be within a preset height range. By adjusting the vibration frequency of the vibration motor 22 to adjust the amount of material delivered by the feeding mechanism 2 to the roller gap 5, the material can be kept evenly distributed on the material channel 23 to achieve the adjustment of the delivery amount.

[0101] In some embodiments, Figure 3 As shown, the step of adjusting the vibration frequency of the vibration motor 22 according to the height of the material to adjust the amount of material conveyed to the roller gap 5 so that the height of the material is within a preset height range includes:

[0102] S41, determining the corresponding relationship between different vibration frequencies of the vibration motor 22 and the height of the material;

[0103] S42. When the height of the material is higher than the preset height range, the vibration motor 22 changes to operate at a first vibration frequency, wherein the height of the material corresponding to the first vibration frequency is lower than the height of the material corresponding to the original vibration frequency; when the height of the material is lower than the preset height range, the vibration motor 22 changes to operate at a second vibration frequency, wherein the height of the material corresponding to the second vibration frequency is higher than the height of the material corresponding to the original vibration frequency.

[0104] In the process of adjusting the vibration frequency of the vibration motor 22 according to the height of the material to adjust the amount of material conveyed to the roller gap 5, it is necessary to first determine the corresponding relationship between the different vibration frequencies of the vibration motor 22 and the height of the material, so as to understand the relationship between the change in the vibration frequency of the vibration motor 22 and the change in the material height, so as to facilitate the subsequent change of the vibration frequency of the vibration motor 22 to achieve the purpose of changing the material height so that the material height is within the preset height range.

[0105] For example, the heights of 10 materials corresponding to 10 different vibration frequencies of the vibration motor 22 may be measured.

[0106] Among them, the height of the material corresponding to the first vibration frequency is lower than the height of the material corresponding to the original vibration frequency. After determining the correspondence between the different vibration frequencies of the vibration motor 22 and the height of the material, when the height of the material is higher than the preset height range, the vibration motor 22 is changed to operate at the first vibration frequency. Since the height of the material corresponding to the first vibration frequency of the vibration motor 22 is lower than the height of the material corresponding to the original vibration frequency, the vibration motor 22 is changed to operate at the first vibration frequency, which will reduce the height of the material so that the height of the material falls back to the preset height range.

[0107] Among them, the height of the material corresponding to the second vibration frequency is higher than the height of the material corresponding to the original vibration frequency. After determining the correspondence between the different vibration frequencies of the vibration motor 22 and the height of the material, when the height of the material is lower than the preset height range, the vibration motor 22 is changed to operate at the second vibration frequency. Since the height of the material corresponding to the second vibration frequency of the vibration motor 22 is higher than the height of the material corresponding to the original vibration frequency, the vibration motor 22 is changed to operate at the second vibration frequency, which will increase the height of the material so that the height of the material is increased to within the preset height range.

[0108] In some embodiments, the threshold is within a preset altitude range.

[0109] By setting the threshold value within a preset height range, when the height of the material reaches the threshold value and the two rollers 1 are started, the height of the material is within the preset height range, and the amount of material delivered to the roller gap 5 does not need to be adjusted immediately, which is conducive to the smooth operation of the coating device.

[0110] In some embodiments, material is conveyed to the roller gap 5 by a feeding mechanism 2, and the feeding mechanism 2 includes a vibration motor 22; the step of adjusting the amount of material conveyed to the roller gap 5 according to the height of the material so that the height of the material is within a preset height range includes: adjusting the amplitude of the vibration motor 22 according to the height of the material to adjust the amount of material conveyed to the roller gap 5 so that the height of the material is within a preset height range.

[0111] In this step, the amount of material delivered by the feeding mechanism 2 to the roller gap 5 is changed by adjusting the amplitude of the vibration motor 22, so that the height of the material can be within a preset height range. By adjusting the amplitude of the vibration motor 22 to adjust the amount of material delivered by the feeding mechanism 2 to the roller gap 5, the delivery amount can be adjusted on the basis of keeping the material evenly distributed on the material channel 23.

[0112] Some embodiments of the present application also provide a pole piece production system, which includes a coating device provided by any of the above-mentioned technical solutions, and the coating device is used to provide a film layer.

[0113] The coating device provided by the aforementioned technical solution is used to provide a film layer in the pole piece production system, so that the pole piece production system produces pole pieces using the film layer provided by the coating device.

[0114] In some embodiments, the pole piece production system further includes two pressure rollers arranged at intervals, a rolling gap is formed between the two pressure rollers, the film layer is coated on the current collector and passes through the rolling gap, and the two pressure rollers are used to roll the film layer and the current collector to form a pole piece.

[0115] The pressure roller may be a roller structure used to press the film layer onto the current collector to achieve connection between the film layer and the current collector.

[0116] By arranging two pressure rollers disposed at intervals, a rolling gap can be formed between the two pressure rollers disposed at intervals, so that after the film layer is coated on the current collector, it can pass through the rolling gap synchronously with the current collector. After the film layer and the current collector are rolled by the two pressure rollers and pass through the rolling gap, the film layer can be firmly connected to the surface of the current collector to form a pole piece.

[0117] Some embodiments of the present application provide coating devices such as Figure 1 As shown, the coating device includes a feeding mechanism 2, a detection mechanism 3, a controller 4 and two rollers 1. The feeding mechanism 2 includes a silo 21, a vibration motor 22 and a material channel 23. The roller gap 5 includes a molding area 51 and an extrusion area 52 arranged on both sides of the molding area 51 along the arrangement direction of the two rollers 1. The output end of the vibration motor 22 is connected to the material channel 23. The controller 4 is communicatively connected to the feeding mechanism 2, the detection mechanism 3 and the rollers 1. The feed port of the material channel 23 is located below the silo 21, and the discharge port of the material channel 23 is located directly above the extrusion area 52. The projection of the detection mechanism 3 in the vertical direction is separated from the projection of the feeding mechanism 2 in the vertical direction and is located in the molding area 51. Since the controller 4 is connected to the feeding mechanism 2 for detecting the height of the material accumulated on the upper side of the roller gap 5, the controller 4 can adjust the amount of material conveyed by the feeding mechanism 2 according to the height of the material on the upper side of the roller gap 5, so that the amount of material conveyed by the feeding mechanism 2 in the coating device can be automatically adjusted. The coating device has a high degree of automation, which is conducive to improving the convenience of film layer production in the electrode.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating device, characterized in that: include: Two rollers are arranged at an interval, and a roller gap is formed between the two rollers; A feeding mechanism, used for conveying materials from the upper side of the roller gap to the roller gap, and the two rollers are used for rolling the materials to form a film layer; A detection mechanism, disposed on the upper side of the roller gap and used to detect the height of the material accumulated on the upper side of the roller gap; A controller is connected to the rollers, the detection mechanism and the feeding mechanism, and is used to adjust the amount of the material delivered by the feeding mechanism; when the height of the material reaches a threshold, the two rollers start and roll the material to form the film layer.

2. The coating device according to claim 1, characterized in that: The feeding mechanism includes a silo, a vibration motor and a material channel, the feed port of the material channel is located below the silo, the discharge port of the material channel is located above the roller gap, the output end of the vibration motor is connected to the material channel, and the vibration motor is communicatively connected to the controller.

3. The coating device according to claim 2, characterized in that: The roller gap includes a forming area and an extrusion area. The extrusion area is arranged on both sides of the forming area along the arrangement direction of the two rollers. The projection of the discharge port of the material channel in the vertical direction is located in the extrusion area.

4. The coating device according to claim 1, characterized in that: In the vertical direction, the projection of the detection mechanism is separated from the projection of the feeding mechanism.

5. The coating device according to claim 1, characterized in that: The detection end of the detection mechanism is oriented in the vertical direction, and at least a portion of the projection of the detection end in the vertical direction is located in the roller gap.

6. The coating device according to claim 5, characterized in that: The roller gap includes a forming area and an extrusion area, the extrusion area is arranged on both sides of the forming area along the arrangement direction of the two rollers, and at least a part of the projection of the detection end in the vertical direction is located in the forming area.

7. A coating method, characterized in that: include: Conveying material to the roller gap between the two rollers from above the roller gap; Detecting the height of the material accumulated on the upper side of the roller gap; When the height of the material reaches a threshold, the two rollers are started and roll the material to form a film layer; The amount of the material conveyed to the roller gap is adjusted according to the height of the material so that the height of the material is within a preset height range.

8. The coating method according to claim 7, characterized in that: The step of adjusting the amount of the material conveyed to the roller gap according to the height of the material so that the height of the material is within a preset height range comprises: When the height of the material is higher than the preset height range, the amount of the material transported to the roller gap is reduced; when the height of the material is lower than the preset height range, the amount of the material transported to the roller gap is increased.

9. The coating method according to claim 7, characterized in that: The material is conveyed to the roller gap by a feeding mechanism, wherein the feeding mechanism includes a vibration motor; and the step of adjusting the amount of the material conveyed to the roller gap according to the height of the material so that the height of the material is within a preset height range comprises: The vibration frequency of the vibration motor is adjusted according to the height of the material to adjust the amount of the material conveyed to the roller gap, so that the height of the material is within a preset height range.

10. The coating method according to claim 9, characterized in that: The step of adjusting the vibration frequency of the vibration motor according to the height of the material to adjust the amount of the material conveyed to the roller gap so that the height of the material is within a preset height range includes: Determining the corresponding relationship between different vibration frequencies of the vibration motor and the height of the material; When the height of the material is higher than the preset height range, the vibration motor changes to operate at a first vibration frequency, wherein the height of the material corresponding to the first vibration frequency is lower than the height of the material corresponding to the original vibration frequency; when the height of the material is lower than the preset height range, the vibration motor changes to operate at a second vibration frequency, wherein the height of the material corresponding to the second vibration frequency is higher than the height of the material corresponding to the original vibration frequency.

11. The coating method according to claim 7, characterized in that: The threshold is within the preset height range.

12. The coating method according to claim 7, characterized in that: The material is conveyed to the roller gap by a feeding mechanism, wherein the feeding mechanism includes a vibration motor; and the step of adjusting the amount of the material conveyed to the roller gap according to the height of the material so that the height of the material is within a preset height range comprises: The amplitude of the vibration motor is adjusted according to the height of the material to adjust the amount of the material conveyed to the roller gap, so that the height of the material is within a preset height range.

13. A pole piece production system, characterized in that: The coating device comprises a coating device as claimed in any one of claims 1 to 6, wherein the coating device is used to provide a film layer.

14. The pole piece production system according to claim 13, characterized in that: It also includes two pressure rollers arranged at intervals, a rolling gap is formed between the two pressure rollers, the film layer is covered on the current collector and passes through the rolling gap, and the two pressure rollers are used to roll the film layer and the current collector to form a pole piece.

Images