Coating device, coating method and electrode sheet production system

Abstract

A coating device, comprising a feeding mechanism (2), a measurement mechanism (3), a controller (4) and two rollers (1), wherein the two rollers (1) are arranged at an interval to form a roller gap (5); the feeding mechanism (2) is configured to convey a material from the upper side of the roller gap (5) to the roller gap (5); the two rollers (1) are configured to roll the material and form a film layer; the measurement mechanism (3) is arranged above the roller gap (5) and is configured to measure the height of the material accumulated above the roller gap (5); and the controller (4) is connected to the measurement mechanism (3) and the feeding mechanism (2) and is configured to regulate the amount of the material conveyed by the feeding mechanism (2). In the coating device, the amount of the material conveyed by the feeding mechanism can be automatically regulated, and the coating device has a high degree of automation, which is conducive for facilitating the production of film layers on electrode plates.

Description

Coating device, coating method and pole piece production system Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411066697.2, filed on August 5, 2024, entitled “A coating device, a coating method and a pole piece production system”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, and in particular to a coating device, a coating method and a pole piece production system. BACKGROUND

[0003] Batteries have the advantages of high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools, etc.

[0004] With the increasing demand for batteries in the market, the automation of the battery production process is increasingly concerned by those skilled in the art. SUMMARY

[0005] In view of the above problems, the present application provides a coating device, a coating method and a pole piece production system, which can improve the convenience of the film layer production process in the pole piece.

[0006] In a first aspect, some embodiments of the present application provide a coating device, which comprises a feeding mechanism, a detection mechanism, a controller and two rollers, the two rollers are arranged at intervals, and a roller gap is formed between the two rollers; the feeding mechanism is used to convey material from the upper side of the roller gap to the roller gap, and the two rollers are used to roll the material 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 conveyed by the feeding mechanism.

[0007] Since the controller is connected to the detection mechanism for detecting the height of the material accumulated on the upper side of the roller gap and the feeding mechanism, the controller can adjust the amount of material conveyed 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 conveyed by the feeding mechanism in the coating device can be automatically adjusted, and the degree of automation of the coating device is higher, which is conducive to improving the convenience of the film layer production in the pole piece.

[0008] According to the coating device provided by some embodiments of the present application, the feeding mechanism comprises a hopper, a vibration motor and a material channel, the feeding port of the material channel is located below the hopper, the discharging port of the material channel is located above the roll gap, the output end of the vibration motor is connected to the material channel, and the vibration motor is in communication connection with the controller, so that the material channel can move the material with the vibration transmitted by the vibration motor as power, which not only enables the material to be smoothly conveyed, but also enables the material to be more uniformly distributed on the upper surface of the material channel, thereby facilitating the improvement of the stability of the feeding mechanism in conveying the material.

[0009] According to the coating device provided by some embodiments of the present application, the roll gap comprises a forming area and a pressing area, the pressing area is arranged on both sides of the forming area along the arrangement direction of the two rollers, and the projection of the discharging port of the material channel in the vertical direction is located in the pressing area. By locating the projection of the discharging port of the material channel in the vertical direction in the pressing area, the material falling from the discharging port of the material channel can fall into the pressing area, which not only enables the material to enter the forming area after being affected by the rollers in the pressing area, thereby facilitating the improvement of the compactness of the material accumulation, but also can reduce the possibility of the feeding mechanism blocking the detection mechanism and other mechanisms.

[0010] According to the coating device provided by 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, thereby facilitating the improvement of the accuracy of the detection result of the detection mechanism.

[0011] According to the coating device provided by some embodiments of the present application, the orientation of the detection end of the detection mechanism is arranged in the vertical direction, and at least part of the projection of the detection end in the vertical direction is located in the roll gap. By arranging the orientation of the detection end in the vertical direction and locating at least part of the projection of the detection end in the vertical direction in the roll gap, the accuracy of the height of the material detected by the detection mechanism can be improved.

[0012] According to the coating device provided by some embodiments of the present application, the roll gap comprises a forming area and a pressing area, the pressing 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 orientation of the detection end can be better directed to the central position of the accumulated material, thereby further improving the accuracy of the height of the material detected by the detection mechanism.

[0013] In a second aspect, some embodiments of the present application provide a coating method, which comprises:

[0014] feeding the material to the roll gap from above the roll gap between the two rollers;

[0015] detecting the height of the material accumulated on the upper side of the roll gap;

[0016] When the height of the material reaches the threshold, the two rollers are started and roll the material to form a film layer;

[0017] The amount of the material delivered 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.

[0018] Through the above method, after obtaining the height information of the material, the amount of the material delivered 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 rollers and has a better rolling effect.

[0019] According to the coating method provided by some embodiments of the present application, the step of adjusting the amount of the material delivered to the roller gap according to the height of the material so that the height of the material is within the preset height range comprises:

[0020] When the height of the material is higher than the preset height range, the amount of the material delivered to the roller gap is reduced; and when the height of the material is lower than the preset height range, the amount of the material delivered to the roller gap is increased.

[0021] According to the coating method provided by some embodiments of the present application, the material is delivered to the roller gap by a feeding mechanism, and the feeding mechanism comprises a vibration motor; and the step of adjusting the amount of the material delivered to the roller gap according to the height of the material so that the height of the material is within the preset height range comprises:

[0022] The vibration frequency of the vibration motor is adjusted according to the height of the material to adjust the amount of the material delivered 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 the material delivered to the roller gap by the feeding mechanism, the adjustment of the delivery amount can be realized on the basis of uniform distribution of the material on the material channel.

[0023] According to the coating method provided by some embodiments of the present application, the vibration frequency of the vibration motor is adjusted according to the height of the material to adjust the amount of the material delivered to the roller gap so that the height of the material is within the preset height range. The step comprises:

[0024] The corresponding relationship between different vibration frequencies of the vibration motor and the height of the material is determined;

[0025] When the height of the material is higher than the preset height range, the vibration motor is changed 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; and when the height of the material is lower than the preset height range, the vibration motor is changed 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.

[0026] According to the coating method provided by some embodiments of the present application, the threshold is in the preset height range. By setting the threshold in 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 in the preset height range, and the amount of material delivered to the roller gap does not have to be adjusted immediately, which is conducive to the smooth operation of the coating device.

[0027] According to the coating method provided by some embodiments of the present application, the material is delivered to the roller gap by the feeding mechanism, and the feeding mechanism includes a vibration motor. The step of adjusting the amount of material delivered to the roller gap according to the height of the material to make the height of the material in the preset height range includes:

[0028] The amplitude of the vibration motor is adjusted according to the height of the material to adjust the amount of material delivered to the roller gap to make the height of the material in the preset height range.

[0029] In a third aspect, some embodiments of the present application provide a pole piece production system, which includes the coating device provided by any of the technical solutions described above, and the coating device is used to provide a film layer.

[0030] According to some embodiments of the present application, a pole piece production system is provided, which further includes two spaced-apart compression rollers, a roller compression gap is formed between the two compression rollers, the film layer covers the current collector and passes through the roller compression gap, and the two compression rollers are used to roll the film layer and the current collector and form a pole piece.

[0031] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0032] 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 spaced apart to form a roller gap. The feeding mechanism is used to deliver material to the roller gap from the upper side of the roller gap. The two rollers are used to roll the material 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 delivered by the feeding mechanism. Since the controller is connected to the detection mechanism for detecting the height of the material accumulated on the upper side of the roller gap and the feeding mechanism, the controller can adjust the amount of material delivered 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 delivered 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 producing the film layer in the pole piece.

[0033] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments and are not meant to limit the scope of the present application. Moreover, the same reference numerals in different figures represent the same or similar components. In the drawings:

[0035] Fig. 1 is a schematic diagram of a coating device according to some embodiments of the present application;

[0036] Fig. 2 is a flowchart of a coating method according to some embodiments of the present application;

[0037] Fig. 3 is a flowchart of step S4 in the coating method according to some embodiments of the present application.

[0038] In the drawings:

[0039] 1, roller; 2, feeding mechanism; 21, hopper; 22, vibration motor; 23, material channel; 3, detection mechanism; 4, controller; 5, roller gap; 51, forming zone; 52, extruding zone. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The articles 'a', 'an', and 'the' each followed by a reference numeral do not denote a limitation of quantity and a quantity of "one" or "one occurrence" is not to be inferred. The terms "comprising", "having", "including", and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to") unless otherwise noted.

[0042] Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiments.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0045] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is 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 and should not constitute any limitation on the present application.

[0046] In the embodiments of the present application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximately parallel which is generally recognized in engineering; at the same time, "perpendicular" not only includes the case of absolute perpendicular, but also includes the case of approximately perpendicular which is generally recognized in engineering. Exemplarily, the included angle between two directions is 85°-90°, which can be considered as the two directions being perpendicular; the included angle between two directions is 0°-5°, which can be considered as the two directions being parallel.

[0047] "Multiple" appearing in the present application means two or more (including two).

[0048] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0049] Coating is an essential process in the production process of battery, and the coating process has a very important influence on the quality of battery, directly affecting the safety, capacity, life and other performance indicators of battery. Coating is a method of coating paste polymer, molten polymer or polymer melt on paper, cloth, plastic film to obtain a composite (film). In the coating process of the electrode sheet, the coating device forms a film layer on the surface of the electrode sheet to make the electrode sheet obtain good electrical properties.

[0050] As a kind of coating process, dry coating process usually transports material to the nip between two rollers by feeding mechanism, so that the material is rolled into a film layer by the rollers. In the prior art, the material output of the feeding mechanism is usually confirmed manually. After the operator confirms the material output, the material output is adjusted by adjusting the feeding mechanism. Since this method cannot timely grasp the material output of the feeding mechanism and cannot real-time adjust the material output of the feeding mechanism, it not only makes the production of the film layer in the pole piece inconvenient and has a low degree of automation, but also has a risk of accidents due to human intervention.

[0051] To improve the convenience of film layer 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 spaced apart to form a nip. The feeding mechanism is used to transport material from the upper side of the nip to the nip. The two rollers are used to roll the material and form a film layer. The detection mechanism is arranged on the upper side of the nip and is used to detect the height of the material accumulated on the upper side of the nip. 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. Since the controller is connected to the detection mechanism for detecting the height of the material accumulated on the upper side of the nip and the feeding mechanism, 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 nip. The amount of material transported by the feeding mechanism in the coating device can be automatically adjusted, and the coating device has a high degree of automation, which is conducive to improving the convenience of film layer production in the pole piece.

[0052] The coating device disclosed in the embodiments of the present application can be used for coating the pole piece, but is not limited to this. It can also be used for coating paper, cloth, plastic film and other films to obtain a composite material (film), thereby obtaining a composite material (film) with certain properties.

[0053] The technical solutions of the coating device, coating method and pole piece production system provided by the specific embodiments of the present application are further described below.

[0054] Some embodiments of the present application provide a coating device, as shown in FIG. 1, which includes a feeding mechanism 2, a detection mechanism 3, a controller 4 and two rollers 1. The two rollers 1 are spaced apart to form a nip 5 between them. The feeding mechanism 2 is used to transport material from the upper side of the nip 5 to the nip 5. The two rollers 1 are used to roll the material and form a film layer. The detection mechanism 3 is arranged on the upper side of the nip 5 and is used to detect the height of the material accumulated on the upper side of the nip 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.

[0055] The roller 1 can be a cylindrical roller capable of rotating around its own axis, which is used to roll the material forming the film layer, so that the material forms a film layer with self-supporting properties, so that the subsequent film layer is laminated with the current collector to form a pole piece.

[0056] By arranging two rollers 1 spaced apart, a roller gap 5 can be formed between the two rollers 1, so that the material can be rolled by the two rollers 1 during the process of passing through the roller gap 5 to form a film layer.

[0057] The feeding mechanism 2 can be a mechanism for feeding the material for forming the film layer to the roller gap 5. The feeding mechanism 2 can act on the material with a force to transport the material. For example, the feeding mechanism 2 can be an air feeding mechanism 2, a belt feeding mechanism 2, or a vibration feeding mechanism 2.

[0058] By arranging 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 to the roller gap 5 from the upper side of the roller gap 5, that is, the discharge port of the feeding mechanism 2 is 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 it is discharged from the discharge port of the feeding mechanism 2.

[0059] The detection mechanism 3 can be a mechanism for measuring the material accumulated on the upper side of the roller gap 5, which is used to measure the height of the material accumulation. For example, the detection mechanism 3 can include a laser sensor or an ultrasonic sensor. Those skilled in the art can select the type of sensor included in the detection mechanism 3 according to the actual situation, so that the detection mechanism 3 can accurately measure the height of the material accumulation.

[0060] The controller 4 can be a device for adjusting the amount of material fed by the feeding mechanism 2. By communicatively connecting the controller 4 with the detection mechanism 3 and the feeding mechanism 2, 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 fed by the feeding mechanism 2 according to the height of the material on the upper side of the roller gap 5.

[0061] For example, the controller 4 can be a centralized or distributed controller 4, such as a single microcontroller or a plurality of microcontrollers distributed to realize the function of the feeding mechanism 2 by running a control program.

[0062] In some embodiments, the controller 4 is connected to a height sensor for detecting the height of the material accumulated on the upper side of the roll gap 5 and the feeding mechanism 2, so that the controller 4 can adjust the amount of material delivered by the feeding mechanism 2 according to the height of the material on the upper side of the roll gap 5, so that the amount of material delivered by the feeding mechanism 2 in the coating device can be automatically adjusted, the coating device has a high degree of automation, and the convenience of producing the film layer in the pole piece is improved.

[0063] In some embodiments, the feeding mechanism 2 includes a hopper 21, a vibration motor 22, and a material channel 23, the feeding inlet of the material channel 23 is located below the hopper 21, the discharging outlet of the material channel 23 is located above the roll gap 5, the output end of the vibration motor 22 is drivingly connected to the material channel 23, and the vibration motor 22 is in communication connection with the controller 4.

[0064] The hopper 21 can be a container for storing material in the feeding mechanism 2, which has a discharging port, and the hopper 21 can stably provide material to the material channel 23 through the discharging port. Exemplarily, the material for forming the film layer can be a powdery material or a slurry material, and the specific state of the material can be set by those skilled in the art according to the actual situation.

[0065] The material channel 23 can be a channel for delivering material. Exemplarily, the material channel 23 can be a plate structure or a belt structure, and the material can be laid on the upper surface of the material channel 23 and moved to the roll 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 move the material under the vibration power transmitted by the vibration motor 22, which not only enables the material to be smoothly delivered, but also enables the material to be more uniformly distributed on the upper surface of the material channel 23, thereby improving the stability of the feeding mechanism 2 in delivering the material.

[0066] By setting the feeding inlet of the material channel 23 below the discharging port of the hopper 21 and setting the discharging outlet of the material channel 23 above the roll gap 5, the material discharged from the discharging port of the hopper 21 can enter the material channel 23 from the feeding inlet of the material channel 23 and fall to the roll gap 5 from the discharging outlet of the material channel 23.

[0067] Since the vibration motor 22 is in communication connection with the controller 4, the operating state of the vibration motor 22 is controlled by the controller 4. Exemplarily, the operating state of the vibration motor 22 can refer to the vibration frequency or amplitude of the vibration motor 22, so that the controller 4 can adjust the amount of material delivered by the feeding mechanism 2 by adjusting the operating state of the vibration motor 22.

[0068] In some embodiments, the roll 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, and the projection of the discharging outlet of the material channel 23 in the vertical direction is located in the extrusion area 52.

[0069] The forming area 51 and the extruding area 52 respectively refer to different areas in the roller gap 5. The forming area 51 can be an area on the upper side of the position with the smallest spacing between the two adjacent roller wheels 1, and the extruding area 52 can refer to an area arranged on both sides of the forming area 51 along the arrangement direction of the two roller wheels 1. The rotation directions of the two roller wheels 1 are arranged oppositely, the material in the extruding area 52 of the roller gap 5 is rolled and moved to the forming area 51 under the action of the roller wheels 1, and the material forms a film layer from the lower side of the forming area 51 after being acted on by the roller wheels 1.

[0070] By arranging the projection of the material outlet of the material channel 23 in the vertical direction to be located in the extruding area 52, the material falling from the material outlet of the material channel 23 can fall into the extruding area 52, which not only enables the material to enter the forming area 51 after being acted on by the roller wheels 1 in the extruding area 52, but also helps to improve the compactness of the material accumulation and reduce the possibility of the feeding mechanism 2 blocking the detection mechanism 3 and other mechanisms.

[0071] In some embodiments, the projection of the detection mechanism 3 is separated from the projection of the feeding mechanism 2 in the vertical direction.

[0072] By arranging the relative positions of the detection mechanism 3 and the feeding mechanism 2, 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, which can reduce the possibility of the feeding mechanism 2 blocking the detection mechanism 3 and improve the accuracy of the detection result of the detection mechanism 3.

[0073] In some embodiments, the orientation of the detection end of the detection mechanism 3 is arranged 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 5.

[0074] The detection end of the detection mechanism 3 can refer to the detection end of the sensor in the detection mechanism 3. By arranging the orientation of the detection end in the vertical direction and arranging at least part of the projection of the detection end in the vertical direction to be located in the roller gap 5, the accuracy of the height of the material detected by the detection mechanism 3 can be improved.

[0075] In some embodiments, the roller gap 5 includes the forming area 51 and the extruding area 52, the extruding area 52 is arranged on both sides of the forming area 51 along the arrangement direction of the two roller wheels 1, and at least part of the projection of the detection end in the vertical direction is located in the forming area 51.

[0076] As in the foregoing solution, the forming area 51 can be an area on the upper side of the position with the smallest spacing between the two adjacent roller wheels 1, and the extruding area 52 can refer to an area arranged on both sides of the forming area 51 along the arrangement direction of the two roller wheels 1.

[0077] By locating at least part of the projection of the detection end in the vertical direction in the forming area 51, the orientation of the detection end can be better directed towards the central position of the accumulated material, which is conducive to further improving the accuracy of the height of the material detected by the detection mechanism 3.

[0078] In some embodiments, the controller 4 is in communication connection with the roller 1, and the controller 4 can adjust the rotation speed of the film forming roller.

[0079] By connecting the controller 4 in communication with the roller 1, 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 transported by the feeding mechanism 2.

[0080] 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 spaced apart to form a roller gap 5 between the two rollers 1 for rolling the material or the film layer.

[0081] For example, 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 film layer, so that the film layer meets the requirements of the pole piece.

[0082] Some embodiments of the present application also provide a coating method, referring to FIG. 2, the coating method comprises the following steps:

[0083] S1, the material is transported to the roller gap 5 from above the roller gap 5 between the two rollers 1.

[0084] In the above step S1, the material is transported to the roller gap 5 from above the roller gap 5 between the two rollers 1, so that the material can fall onto the upper side of the roller gap 5, so that the material can be accumulated on the upper side of the roller gap 5, and the two rollers 1 can bring the material into the roller gap 5 by relative rotation to realize the rolling and forming of the material to form a film layer.

[0085] As in the foregoing technical solution, the material can be transported to the roller gap 5 from above the roller gap 5 by the feeding mechanism 2.

[0086] S2, detecting the height of the material accumulated on the upper side of the roller gap 5.

[0087] In the above step S2, by detecting the height of the material accumulated on the upper side of the roller gap 5, the accumulation of the material on the upper side of the roller gap 5 can be detected, and subsequent adjustments can be made in a timely manner according to the accumulation of the material.

[0088] For example, the height of the material on the upper side of the roll gap 5 can be detected by a detection mechanism 3 so as to conveniently and timely know the height of the material accumulation.

[0089] S3. When the height of the material reaches the threshold, the two rollers 1 start and roll the material to form a film.

[0090] In step S3 above, by setting a threshold for the height of the material, the two rollers 1 will start and roll the material when the height of the material reaches the threshold. This ensures that enough material can accumulate at the roller gap 5 when the rollers 1 are rolling the material, which helps to reduce the possibility of material shortage during the rolling process.

[0091] When the two rollers 1 start 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.

[0092] In some embodiments, the controller 4 can be communicatively connected to the roller 1, such that the controller 4 controls the roller 1 to start. For example, the controller 4 is communicatively connected to both the roller 1 and the detection mechanism 3, such that when the detection mechanism 3 detects that the height of the material has reached a threshold, the controller 4 controls the roller 1 to start.

[0093] S4. Adjust the amount of material fed to the roller gap 5 according to the height of the material so that the height of the material is within the preset height range.

[0094] In step S4 above, 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.

[0095] For example, the amount of material conveyed by the roller gap 5 can be adjusted by the controller 4 controlling the feeding mechanism 2.

[0096] In some embodiments, the step of adjusting the amount of material fed to the roll gap 5 according to the height of the material so that the height of the material is within a preset height range includes: reducing the amount of material fed to the roll gap 5 when the height of the material is higher than the preset height range; and increasing the amount of material fed to the roll gap 5 when the height of the material is lower than the preset height range.

[0097] By reducing the amount of material fed to the roll gap 5 when the material height is higher than the preset height range, the amount of material obtained at the roll gap 5 is reduced, while the roller 1 maintains its original state to roll and press the material. As the roller 1 rolls and shapes the material, the amount of accumulated material continuously decreases, and the height of the accumulated material gradually decreases to fall back to the preset height range.

[0098] 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 remains in the original state to roll the material, so that the amount of accumulated material increases continuously as the material is delivered to the roller gap 5, thereby gradually increasing the height of the accumulated material to rise to within the preset height range.

[0099] In some embodiments, the material is delivered to the roller gap 5 by the feeding mechanism 2, which includes a vibration motor 22; and the step of adjusting the amount of material delivered to the roller gap 5 according to the height of the material to keep the height of the material within the preset height range includes adjusting the vibration frequency of the vibration motor 22 to adjust the amount of material delivered to the roller gap 5 according to the height of the material to keep the height of the material within the preset height range.

[0100] As in the foregoing technical solution, the feeding mechanism 2 is a mechanism for delivering material for forming a film layer to the roller gap 5. By including the vibration motor 22 in the feeding mechanism 2, the feeding mechanism 2 can deliver material by relying on the vibration force.

[0101] In this step, the amount of material delivered to the roller gap 5 by the feeding mechanism 2 is changed by adjusting the vibration frequency of the vibration motor 22, so that the height of the material can be within the preset height range. By adjusting the vibration frequency of the vibration motor 22 to adjust the amount of material delivered to the roller gap 5 by the feeding mechanism 2, the adjustment of the delivery amount can be realized on the basis of uniform distribution of the material on the material channel 23.

[0102] In some embodiments, as shown in FIG. 3, the step of adjusting the amount of material delivered to the roller gap 5 according to the height of the material to keep the height of the material within the preset height range includes:

[0103] S41, determining the correspondence between different vibration frequencies of the vibration motor 22 and the height of the material;

[0104] S42, in the state that the height of the material is higher than the preset height range, the vibration motor 22 is changed 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; and in the state that the height of the material is lower than the preset height range, the vibration motor 22 is changed 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.

[0105] In the process of adjusting the amount of material delivered to the nip 5 according to the height of the material by adjusting the vibration frequency of the vibration motor 22, first, the correspondence between different vibration frequencies of the vibration motor 22 and the height of the material is determined, so as to know the relationship between the change of the vibration frequency of the vibration motor 22 and the change of the height of the material, and facilitate subsequent change of the height of the material by appropriate change of the vibration frequency of the vibration motor 22 to make the height of the material within the preset height range.

[0106] Exemplarily, 10 different vibration frequencies of the vibration motor 22 correspond to 10 heights of the material.

[0107] 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 different vibration frequencies of the vibration motor 22 and the height of the material, in the state that 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 lower the height of the material to make the height of the material fall back within the preset height range.

[0108] 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 different vibration frequencies of the vibration motor 22 and the height of the material, in the state that 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 raise the height of the material to make the height of the material rise within the preset height range.

[0109] In some embodiments, the threshold is within the preset height range.

[0110] By setting the threshold within the preset height range, when the two roller wheels 1 are started after the height of the material reaches the threshold, the height of the material is within the preset height range, and the amount of material delivered to the nip 5 does not have to be adjusted immediately, which is conducive to smooth operation of the coating device.

[0111] In some embodiments, the material is delivered to the nip 5 by the feeding mechanism 2, the feeding mechanism 2 comprising the vibration motor 22; and the step of adjusting the amount of material delivered to the nip 5 according to the height of the material to make the height of the material within the preset height range comprises adjusting the amplitude of the vibration motor 22 to adjust the amount of material delivered to the nip 5 according to the height of the material to make the height of the material within the preset height range.

[0112] 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 the 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 amount of material can be adjusted on the basis of uniform distribution of the material on the material channel 23.

[0113] Some embodiments of the present application also provide an electrode sheet production system, which comprises the coating device provided by any of the technical solutions described above, and the coating device is used to provide a film layer.

[0114] The coating device provided by the foregoing technical solutions is used to provide a film layer in the electrode sheet production system, so that the electrode sheet production system produces an electrode sheet by using the film layer provided by the coating device.

[0115] In some embodiments, the electrode sheet production system further comprises two spaced-apart pressure rollers, a roller pressing gap is formed between the two pressure rollers, the film layer covers the current collector and passes through the roller pressing gap, and the two pressure rollers are used to roll the film layer and the current collector and form an electrode sheet.

[0116] The pressure roller can be a roller structure used to roll the film layer on the current collector to connect the film layer and the current collector.

[0117] By arranging two spaced-apart pressure rollers, a roller pressing gap can be formed between the two spaced-apart pressure rollers, so that after the film layer covers the current collector, the film layer can pass through the roller pressing 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 roller pressing gap, the film layer can be firmly connected to the surface of the current collector to form an electrode sheet.

[0118] The coating device provided by some embodiments of the present application is shown in FIG. 1. The coating device comprises a feeding mechanism 2, a detection mechanism 3, a controller 4, and two rollers 1. The feeding mechanism 2 comprises a hopper 21, a vibration motor 22, and a material channel 23. The roller gap 5 comprises a forming area 51 and two extrusion areas 52 arranged on the two sides of the forming 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 feeding inlet of the material channel 23 is located below the hopper 21, and the discharging outlet 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 located in the forming 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 delivered by the feeding mechanism 2 according to the height of the material on the upper side of the roller gap 5. Therefore, the amount of material delivered by the feeding mechanism 2 in the coating device can be automatically adjusted, and the coating device has a high degree of automation, which is conducive to improving the convenience of film layer production in the electrode sheet.

[0119] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating device characterized by comprising: The application relates to a film layer forming device, comprising: two rollers arranged in a spaced manner, a roller gap being formed between the two rollers; a feeding mechanism arranged above the roller gap and used for feeding material to the roller gap, the two rollers being used for rolling the material and forming a film layer; a detecting mechanism arranged above the roller gap and used for detecting the height of the material accumulated above the roller gap; a controller connected to the detecting mechanism and the feeding mechanism and used for adjusting the amount of the material fed by the feeding mechanism.

2. The coating apparatus according to claim 1, characterized in that The feeding mechanism comprises a hopper, a vibrating motor and a material channel, the feeding port of the material channel is arranged below the hopper, the discharging port of the material channel is arranged above the roller gap, the output end of the vibrating motor is connected to the material channel, and the vibrating motor is in communication connection with the controller.

3. The coating apparatus according to claim 2, wherein The roller gap comprises a forming area and a pressing area, the pressing area is arranged on both sides of the forming area along the arrangement direction of the two rollers, and the projection of the discharging port of the material channel in the vertical direction is located in the pressing area.

4. The coating apparatus according to any one of claims 1 to 3, characterized in that In the vertical direction, the projection of the detecting mechanism is separated from the projection of the feeding mechanism.

5. The coating apparatus according to any one of claims 1 to 4, characterized in that The orientation of the detecting end of the detecting mechanism is arranged in the vertical direction, and at least part of the projection of the detecting end in the vertical direction is located in the roller gap.

6. The coating apparatus according to claim 5, wherein The roller gap comprises a forming area and a pressing area, the pressing 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 detecting end in the vertical direction is located in the forming area.

7. A coating method characterized by, The application relates to a film layer forming device, comprising: feeding material to a roller gap between two rollers from above the roller gap; detecting the height of the material accumulated above the roller gap; when the height of the material reaches a threshold value, the two rollers are started and used for rolling the material to form a film layer; adjusting the amount of the material fed to the roller gap 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 fed 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 fed to the roller gap is reduced; and when the height of the material is lower than the preset height range, the amount of the material fed to the roller gap is increased.

9. The coating method according to claim 7 or 8, characterized in that, The step of adjusting the amount of the material fed 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: adjusting the vibration frequency of the vibrating motor according to the height of the material to adjust the amount of the material fed 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 amount of the material fed 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: determining the corresponding relationship between different vibration frequencies of the vibrating motor and the height of the material; In a state where the height of the material is higher than the preset height range, the vibration motor is changed 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; in a state where the height of the material is lower than the preset height range, the vibration motor is changed 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 any one of claims 7 to 10, characterized in that, The threshold value is within the preset height range.

12. The coating method according to any one of claims 7 to 11, characterized in that, The material is fed to the roll gap by a feeding mechanism, the feeding mechanism comprising a vibration motor; the step of adjusting the amount of the material fed to the roll gap according to the height of the material so as to keep the height of the material 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 fed to the roll gap so as to keep the height of the material within a preset height range.

13. A pole piece production system characterized by, The coating device is used to provide a film layer.

14. The pole piece production system of claim 13, wherein, Two spaced-apart compression rollers are further included, a roll gap is formed between the two compression rollers, the film layer is coated on the current collector and passes through the roll gap, and the two compression rollers are used to roll the film layer and the current collector and form a pole piece.

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