Coating apparatus and coating system

Abstract

A coating apparatus (10) and a coating system. The coating apparatus (10) comprises a coating die head (100) and a slurry supply source (200), wherein a first discharge port (111) and a second discharge port (112) adjacent to each other are formed on the coating die head (100); the slurry supply source (200) is connected to the coating die head (100); and slurry provided by the slurry supply source (200) is coated on a main body area (21) of an electrode sheet (20) via the first discharge port (111), and is coated on a thinned area (22) of the electrode sheet (20) via the second discharge port (112). The coating apparatus and system improve the work efficiency of slurry coating, and increase the yield rate of finished electrode sheets.

Description

Coating apparatus and coating system

[0001] This application claims priority to the Chinese patent application No. 202420778953X, filed on April 15, 2024, and entitled "A coating apparatus and coating system", which is incorporated by reference in its entirety.

TECHNICAL FIELD

[0002] The present application relates to the technical field of battery processing, in particular to a coating apparatus and coating system.

BACKGROUND

[0003] Energy saving and emission reduction is the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle ability, high working voltage, environmental protection and low self-discharge.

[0004] In the production process of the battery, the slurry needs to be coated on the pole piece to form an active material layer. In the existing scheme, the edge active material is thinned by a thinning device to form a thinning area of the pole piece. However, this method is difficult to accurately control the thickness of the thinning area, resulting in problems such as reduction of product quality.

SUMMARY

[0005] The main purpose of the present application is to provide a coating apparatus and coating system to solve the above technical problems existing in the prior art.

[0006] To solve the above problems, the present application provides a coating apparatus, which comprises a coating die and a slurry supply source. The coating die is formed with a first discharge port and a second discharge port arranged adjacent to each other. The slurry supply source is connected with the coating die. The slurry provided by the slurry supply source is coated on the main body area of the pole piece through the first discharge port and on the thinning area of the pole piece through the second discharge port. In this way, the coating die has the first discharge port and the second discharge port. The slurry is coated on the main body area of the pole piece through the first discharge port, and the slurry is coated on the thinning area of the pole piece through the second discharge port. The same coating die can be used to coat the slurry on the main body area and the thinning area, thereby improving the work efficiency of slurry coating. The slurry of the thinning area is supplied by the second discharge port alone, and the amount of slurry coated on the thinning area can be accurately controlled through the second discharge port, thereby improving the yield of the pole piece product.

[0007] In some embodiments, the number of second discharge ports is two, and the first discharge port is located between the two second discharge ports. In this way, the first discharge port is located between the two second discharge ports, which can simultaneously coat the slurry on the two thinning areas, thereby improving the work efficiency of slurry coating.

[0008] In some embodiments, the coating device further comprises a controller configured to control the adjusting member to adjust the flow rate of the slurry delivered to the second discharge port. In this way, the flow rate of the slurry delivered to the second discharge port can be further automatically and accurately controlled by the controller.

[0009] In some embodiments, the coating device further comprises a controller configured to control the adjusting member to adjust the flow rate of the slurry delivered to the second discharge port. In this way, the flow rate of the slurry delivered to the second discharge port can be further automatically and accurately controlled by the controller.

[0010] In some embodiments, the coating device further comprises a thickness detector configured to detect the thickness of the thinning area. In this way, the thickness of the thinning area can be detected by the thickness detector, and the flow rate of the slurry delivered to the second discharge port can be controlled according to the detection result, so as to automatically and accurately control the thickness of the thinning area online.

[0011] In some embodiments, the coating die comprises a first die, a second die, and a gasket, the gasket being arranged between the first die and the second die, and the gasket being configured to cooperate with at least one of the first die and the second die to form the first discharge port and the second discharge port. In this way, the first die, the second die, and the gasket cooperate to form the coating die, which can reduce the difficulty of forming the coating die, and at least one of the first die and the second die can be used to form the first discharge port and the second discharge port, so as to accurately control the size of the first discharge port and the second discharge port, and further accurately control the amount of slurry in the first discharge port and the second discharge port.

[0012] In some embodiments, the gasket is provided with a slurry flow channel, one end of the slurry flow channel being in communication with the slurry supply source, and the other end of the slurry flow channel cooperating with the first die or the second die to form the second discharge port. In this way, the slurry output by the slurry supply source can flow to the second discharge port through the slurry flow channel.

[0013] In some embodiments, the ratio between the depth of the slurry flow channel and the thickness of the gasket is greater than 0 and less than or equal to 80%. In this way, the amount of slurry flowing out of the second discharge port can be accurately controlled by limiting the depth of the slurry flow channel.

[0014] In some embodiments, at least one of the first die and the second die is provided with a flow guide groove configured to guide the slurry to flow out of the first discharge port. In this way, the slurry output by the slurry supply source can flow to the first discharge port through the flow guide groove.

[0015] In some embodiments, the slurry supply source includes a first supply source and a second supply source, the first supply source provides the slurry to be coated on the main body area of the pole piece via the first discharge port, and the second supply source provides the slurry to be coated on the thinned area of the pole piece via the second discharge port. In this way, the first supply source provides the slurry to the first discharge port, and the second supply source provides the slurry to the second discharge port, which can further accurately control the amount of slurry of the second discharge port, and thus accurately control the finished thickness of the thinned area, thereby improving the finished yield of the pole piece.

[0016] To solve the above problems, the application provides a coating system, which includes a pole piece and the above-mentioned coating device, the pole piece includes a main body area and a thinned area, and the coating device is used for coating the slurry on the main body area of the pole piece and the thinned area of the pole piece.

[0017] In some embodiments, the ratio of the width of the second discharge port of the coating device to the width of the thinned area of the pole piece is greater than or equal to 10% and less than or equal to 1. In this way, by limiting the width of the second discharge port, the amount of slurry flowing out of the second discharge port can be accurately controlled, and thus the finished thickness of the thinned area can be accurately controlled, thereby improving the finished yield of the pole piece. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] FIG. 1 is an exploded structural schematic diagram of a battery cell according to one or more embodiments of the present application;

[0020] FIG. 2 is a first structural schematic diagram of a pole piece according to one or more embodiments of the present application;

[0021] FIG. 3 is a first structural schematic diagram of a coating system according to one or more embodiments of the present application;

[0022] FIG. 4 is a second structural schematic diagram of a pole piece according to one or more embodiments of the present application;

[0023] FIG. 5 is a structural schematic diagram of a coating die according to one or more embodiments of the present application;

[0024] FIG. 6 is a structural schematic diagram of a coating die and a pole piece according to one or more embodiments of the present application;

[0025] FIG. 7 is a second structural schematic diagram of a coating system according to one or more embodiments of the present application.

[0026] End cap 10a; housing 10b; electrode assembly 10c; coating system 1; coating device 10; coating die 100; gasket 110; first discharge port 111; second discharge port 112; slurry flow channel 113; first die 120; second die 130; flow guide groove 140; slurry supply 200; delivery pipe 300; adjusting member 400; controller 500; thickness detector 600; electrode tab 20; main body region 21; thinned region 22. DETAILED DESCRIPTION

[0027] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0028] 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims and the aforementioned drawings, are intended to cover not exclusive inclusions.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0030] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0032] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] 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 used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0036] In some embodiments, the battery can include a box body and a battery cell, and the battery cell is accommodated in the box body. In the battery, the battery cell can be multiple, and the multiple battery cells can be connected in series or in parallel or in a mixed connection, where the mixed connection means that there are both series connection and parallel connection among the multiple battery cells. The multiple battery cells can be directly connected in series or in parallel or in a mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box body; of course, the battery can also be that the multiple battery cells are first connected in series or in parallel or in a mixed connection to form a battery module, and then multiple battery modules are connected in series or in parallel or in a mixed connection to form a whole, and are accommodated in the box body. The battery can also include other structures, for example, the battery can also include a current combing component for realizing the electrical connection between the multiple battery cells.

[0037] The manufacturing method of the battery cell includes the lamination type and the winding type, i.e., the battery cell is divided into the lamination battery and the winding battery. The lamination battery has uniform current collection effect, small battery internal resistance, and large specific power, but in order to improve the precision, the mold precision requirement is very high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to manufacture, the piece manufacturing and assembly process generally requires equipment precision, has high production efficiency, and low cost. In terms of performance, the winding battery has excellent high and low temperature performance, very fast charging, super long life, stable high output voltage, and strong structure and shock resistance.

[0038] Referring to FIG. 1, FIG. 1 is an exploded structural schematic diagram of a battery cell according to one or more embodiments of the present application.

[0039] The battery cell refers to the smallest unit that constitutes the battery. The battery cell can include a housing, an electrode assembly 10c, and other functional components, and the housing includes an end cap 10a and a case 10b.

[0040] The end cap 10a refers to a component that covers the opening of the case 10b to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap 10a can be adapted to the shape of the case 10b to fit the case 10b. Alternatively, the end cap 10a can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cap 10a is not easy to deform when subjected to extrusion and impact, so that the battery cell can have higher structural strength, and the safety performance can also be improved. The case 10b is a component for fitting the end cap 10a to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly 10c, the electrolyte, and other components. The case 10b and the end cap 10a can be independent components, and an opening can be provided on the case 10b, and the end cap 10a is covered on the opening to form the internal environment of the battery cell.

[0041] The electrode assembly 10c is a component in which an electrochemical reaction occurs in the battery cell. One or more electrode assemblies 10c can be contained in the case 10b. The electrode assembly 10c is mainly formed by winding or layering the positive electrode sheet 20 and the negative electrode sheet 20, and generally has a separator between the positive electrode sheet 20 and the negative electrode sheet 20.

[0042] Referring to FIG. 2, FIG. 2 is a first structural schematic diagram of an electrode sheet 20 according to one or more embodiments of the present application.

[0043] The pole piece 20 can be a positive pole piece or a negative pole piece. The pole piece 20 has a portion of active material constituting a main body of the electrode assembly 10c, and portions of the pole piece 20 without active material each constitute a tab. In the charging and discharging process of the battery, the active material reacts with the electrolyte, and the tab is connected to the electrode terminal to form a current loop. As shown in FIG. 2, the pole piece 20 can be divided into a main body area 21 and a thinned area 22 along the width direction of the pole piece 20. The main body area 21 and the thinned area 22 can each be used to coat active material. The thickness of the active material coated on the main body area 21 is greater than the thickness of the active material coated on the thinned area 22. The pole piece 20 coated with active material is then wound along the length direction to form the electrode assembly 10c. The active material can be coated on the pole piece 20 in the form of slurry, and then fixed on the pole piece 20 by baking and rolling, etc. The material of the slurry can include, but is not limited to, lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds, artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0044] In the production process of the battery, the slurry needs to be coated on the pole piece 20 to form an active material layer. In related technical solutions, the edge active material is thinned by a thinning device to form the thinned area 22 of the pole piece 20. However, this method is difficult to accurately control the thickness of the thinned area 22, resulting in problems such as reduced product quality.

[0045] To solve the technical problems in the related art, the present application provides a coating system 1, which can include a coating device 10 and a pole piece 20. The coating device 10 has two discharge ports. When the coating device 10 is used for slurry coating, one discharge port corresponds to the thinned area 22 of the pole piece 20, and the other discharge port corresponds to the main body area 21 of the pole piece 20. Therefore, the amount of slurry coated on the thinned area 22 can be accurately controlled, and the yield of the finished pole piece 20 can be improved.

[0046] Referring to FIG. 3, FIG. 3 is a first structural schematic diagram of the coating system 1 according to one or more embodiments of the present application.

[0047] The coating system 1 comprises the pole piece 20 and the coating device 10, the pole piece 20 comprises the main body area 21 and the thinning area 22, and the coating device 10 is used to coat the slurry on the main body area 21 of the pole piece 20 and the thinning area 22 of the pole piece 20. The main body area 21 and the thinning area 22 can be divided along the width direction of the pole piece 20, and the pole piece 20 is wound along the length direction to form the electrode assembly 10c. The coating device 10 can be configured to coat one group of the main body area 21 and the thinning area 22 at a time to form the pole piece 20 shown in FIG. 2, or the coating device 10 can also be configured to coat multiple groups of the main body area 21 and the thinning area 22 at a time to form the pole piece 20 shown in FIG. 4, in which the pole piece 20 shown in FIG. 4 can be cut along the dashed line, and a total of four separate pole pieces 20 shown in FIG. 2 are formed, and the four separate pole pieces 20 are wound separately to form four electrode assemblies 10c.

[0048] Specifically, the coating device 10 can comprise a coating die head 100 and a slurry supply source 200, the coating die head 100 is formed with the first discharge port 111 and the second discharge port 112 arranged adjacent to each other; the slurry supply source 200 is connected with the coating die head 100, and the slurry provided by the slurry supply source 200 is coated on the main body area 21 of the pole piece 20 through the first discharge port 111 and on the thinning area 22 of the pole piece 20 through the second discharge port 112. The slurry supply source 200 is used to provide the slurry, and the slurry supply source 200 can be connected with the coating die head 100 through a pipeline, and then the slurry is input into the coating die head 100 through the slurry supply source 200. The first discharge port 111 and the second discharge port 112 are arranged adjacent to each other, and specifically, the first discharge port 111 and the second discharge port 112 can be specifically arranged such that when the coating device 10 coats the pole piece 20 with the slurry, the first discharge port 111 corresponds to the position of the main body area 21 of the pole piece 20, and the second discharge port 112 corresponds to the position of the thinning area 22 of the pole piece 20. When it is necessary to coat the pole piece 20 with the slurry, the slurry can be input into the coating die head 100 through the slurry supply source 200, and then the slurry is coated on the main body area 21 of the pole piece 20 through the first discharge port 111 and on the thinning area 22 of the pole piece 20 through the second discharge port 112, and the pole piece 20 is moved at the same time of coating through the coating die head 100 to change the positions of the pole piece 20 corresponding to the first discharge port 111 and the second discharge port 112, so as to coat the slurry on different positions of the pole piece 20.

[0049] Through the above embodiment, the coating die 100 has the first discharge port 111 and the second discharge port 112, the slurry is coated on the main body area 21 of the pole piece 20 through the first discharge port 111, and the slurry is coated on the thinned area 22 of the pole piece 20 through the second discharge port 112. The slurry can be coated on the main body area 21 and the thinned area 22 through the same coating die 100, thereby improving the work efficiency of the slurry coating, and the slurry of the thinned area 22 is supplied by the second discharge port 112 alone. The amount of slurry coated on the thinned area 22 can be accurately controlled through the second discharge port 112, thereby improving the yield of the finished product of the pole piece 20.

[0050] In some embodiments, the ratio of the width of the second discharge port 112 of the coating device 10 to the width of the thinned area 22 of the pole piece 20 is greater than or equal to 10% and less than or equal to 1. That is, the width of the second discharge port 112 is 10% to 100% of the width of the thinned area 22. Among them, the width of the thinned area 22 can be set to between 0 mm and 30 mm, for example, the width of the thinned area 22 can be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm, etc., or the width of the thinned area 22 can also be between 0 mm and 10 mm, between 0 mm and 20 mm, between 10 mm and 30 mm or between 10 mm and 20 mm. Correspondingly, the width of the second discharge port 112 of the coating device 10 can be designed according to the width of the thinned area 22, so that by limiting the width of the second discharge port 112, the amount of slurry flowing out of the second discharge port 112 can be accurately controlled, thereby accurately controlling the thickness of the finished product of the thinned area 22, and improving the yield of the finished product of the pole piece 20.

[0051] In some embodiments, the number of the second outlets 112 is two, and the first outlet 111 is located between the two second outlets 112. The two second outlets 112 can be respectively connected to the slurry supply source 200, and the two second outlets 112 are located on both sides of the first outlet 111, so that the coating device 10 can coat the pole piece 20 into a shape with the thinned regions 22 on both sides of the main body region 21. For example, as shown in FIG. 4, the pole piece 20 is divided into two parts along the width of the pole piece 20, and each part includes the thinned regions 22 on both sides and the main body region 21 in the middle. When there are two second outlets 112 and the two second outlets 112 are located on both sides of the first outlet 111, the coating device 10 can coat the pole piece 20 into the form of one of the two parts, so that the two thinned regions 22 can be coated with slurry at the same time, thereby improving the work efficiency of slurry coating. In other embodiments, the coating die 100 can also include two first outlets 111 and four second outlets 112, and the two second outlets 112 are located between the two first outlets 111. The two first outlets 111 and the four second outlets 112 are arranged side by side, so that the coating device 10 can coat the pole piece 20 into the form of the pole piece 20 shown in FIG. 4.

[0052] In some embodiments, the coating device 10 includes a delivery pipeline 300 and an adjusting member 400. The delivery pipeline 300 connects the second outlet 112 and the slurry supply source 200 through the adjusting member 400, and the adjusting member 400 is used to adjust the flow of slurry delivered to the second outlet 112. The delivery pipeline 300 connects the second outlet 112 and the slurry supply source 200, respectively, and the adjusting member 400 can be located on the delivery pipeline 300. By adjusting the flow of slurry through the adjusting member 400, the amount of slurry coated on the thinned region 22 can be adjusted. The adjusting member 400 can include, but is not limited to, a screw pump or a regulating valve, etc. When the adjusting member 400 is a screw pump, the flow of slurry delivered to the second outlet 112 can be controlled by adjusting the pump speed of the screw pump. When the number of the second outlets 112 is multiple, the delivery pipeline 300 can include a main pipeline and multiple branch pipelines. The main pipeline is connected to the slurry supply source 200, and each branch pipeline is connected to the main pipeline and one second outlet 112, respectively. Each branch pipeline can be connected to one adjusting member 400. In this way, by adjusting the flow of slurry delivered to the second outlet 112 through the adjusting member 400, the amount of slurry in the second outlet 112 can be more accurately controlled, thereby accurately controlling the finished thickness of the thinned region 22 and improving the finished yield of the pole piece 20.

[0053] Further, the coating device 10 further comprises a controller 500, which is configured to control the adjusting member 400 to adjust the flow rate of the slurry delivered to the second discharge port 112. For example, when the adjusting member 400 is a pump, the controller 500 can be configured to control the pump speed of the pump, so as to control the flow rate of the slurry delivered to the second discharge port 112. The controller 500 can receive a relevant control signal, and control the adjusting member 400 according to the control signal. For example, the controller 500 can be manually inputted with the control signal, and control the adjusting member 400 according to the inputted control signal. Alternatively, the controller 500 can receive the thickness of the thinned area 22, and generate the control signal according to the thickness of the thinned area 22, and control the adjusting member 400 according to the control signal. In this way, the controller 500 can be configured to control the adjusting member 400 to adjust the flow rate of the slurry delivered to the second discharge port 112, so as to further automatically and accurately control the amount of the slurry delivered to the second discharge port 112.

[0054] Further, the coating device 10 further comprises a thickness detector 600, which is configured to detect the thickness of the thinned area 22. The thickness detector 600 can be configured to detect the thickness of the thinned area 22 in real time. The thickness detector 600 can be communicatively connected to the controller 500, and transmit the detected thickness of the thinned area 22 to the controller 500, so that the controller 500 can control the adjusting member 400 in real time according to the thickness of the thinned area 22. In this way, the thickness detector 600 can be configured to detect the thickness of the thinned area 22, so as to control the adjusting member 400 to deliver the slurry to the second discharge port 112 according to the detection result of the thickness, and automatically and accurately control the thickness of the thinned area 22 on line.

[0055] In combination with FIG. 5 and FIG. 6, FIG. 5 is a structural schematic diagram of a coating die according to one or more embodiments of the present application; and FIG. 6 is a structural schematic diagram of a coating die 100 and a pole piece 20 according to one or more embodiments of the present application.

[0056] The coating die 100 comprises a first die 120, a second die 130, and a gasket 110, the gasket 110 is clamped between the first die 120 and the second die 130, and the gasket 110 is used to cooperate with at least one of the first die 120 and the second die 130 to form a first discharge port 111 and a second discharge port 112. Specifically, a groove can be formed on the gasket 110, so that when the gasket 110 is clamped between the first die 120 and the second die 130, the first die 120 and the second die 130 can cooperate to form the first discharge port 111 and / or the second discharge port 112. Alternatively, a groove can be formed on the side of the first die 120 facing the gasket 110, so that when the gasket 110 is clamped between the first die 120 and the second die 130, the gasket 110 and the second die 130 can cooperate to form the first discharge port 111 and / or the second discharge port 112. Alternatively, a groove can be formed on the side of the second die 130 facing the gasket 110, so that when the gasket 110 is clamped between the first die 120 and the second die 130, the gasket 110 and the first die 120 can cooperate to form the first discharge port 111 and / or the second discharge port 112, so that the size of the first discharge port 111 and the second discharge port 112 can be accurately controlled, and the amount of slurry of the first discharge port 111 and the second discharge port 112 can be accurately controlled. Moreover, the coating die 100 is formed by the cooperation of the first die 120, the second die 130 and the gasket 110, so that the forming difficulty of the coating die 100 can be reduced.

[0057] Further, the gasket 110 is provided with a slurry flow channel 113, one end of the slurry flow channel 113 is in communication with the slurry supply source 200, and the other end of the slurry flow channel 113 cooperates with the first die 120 or the second die 130 to form the second discharge port 112. As shown in FIG. 3, the slurry flow channel 113 can have any shape, for example, the slurry flow channel 113 includes but is not limited to a straight flow channel or a curved flow channel. The slurry flow channel 113 can be formed on the side of the gasket 110 facing the first die 120, so that when the gasket 110 is clamped between the first die 120 and the second die 130, the second discharge port 112 can be formed by the cooperation of the first die 120 and the gasket 110. Alternatively, the slurry flow channel 113 can be formed on the side of the gasket 110 facing the second die 130, so that when the gasket 110 is clamped between the first die 120 and the second die 130, the second discharge port 112 can be formed by the cooperation of the second die 130 and the gasket 110. Alternatively, the slurry flow channel 113 can be formed on the side of the gasket 110 facing the first die 120 and on the side of the gasket 110 facing the second die 130, so that when the gasket 110 is clamped between the first die 120 and the second die 130, one second discharge port 112 can be formed by the cooperation of the first die 120 and the gasket 110, and another second discharge port 112 can be formed by the cooperation of the second die 130 and the gasket 110.

[0058] Further, a ratio between the depth of the slurry flow channel 113 and the thickness of the gasket 110 is greater than 0 and less than or equal to 80%. The thickness of the gasket 110 can be understood as a dimension that allows the first die head 120 and the second die head 130 to be kept apart when the gasket 110 is clamped between the first die head 120 and the second die head 130. Similarly, the depth of the slurry flow channel 113 can be understood as a dimension of the slurry flow channel 113 in the direction of the spacing between the first die head 120 and the second die head 130. The ratio between the depth of the slurry flow channel 113 and the thickness of the gasket 110 can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80%, and the like. The ratio between the depth of the slurry flow channel 113 and the thickness of the gasket 110 can also be between 10% and 80%, between 20% and 80%, between 20% and 70%, between 30% and 60%, or between 40% and 70%, and the like. In this way, by limiting the depth of the slurry flow channel 113, the amount of slurry flowing out of the second discharge port 112 can be accurately controlled.

[0059] In some embodiments, at least one of the first die head 120 and the second die head 130 is provided with a flow guide groove 140 for guiding the slurry to flow out of the first discharge port 111. The flow guide groove 140 can be recessed on the side of the first die head 120 facing the gasket 110. When the gasket 110 is clamped between the first die head 120 and the second die head 130, the opening of the flow guide groove 140 can be blocked by the gasket 110. The slurry flowing out of the slurry supply source 200 can flow into the flow guide groove 140 and contact the gasket 110, so that the slurry flows out through the first discharge port 111. Alternatively, the flow guide groove 140 can be recessed on the side of the second die head 130 facing the gasket 110. When the gasket 110 is clamped between the first die head 120 and the second die head 130, the opening of the flow guide groove 140 can be blocked by the gasket 110. The slurry flowing out of the slurry supply source 200 can flow into the flow guide groove 140 and contact the gasket 110, so that the slurry flows out through the first discharge port 111. Alternatively, the flow guide groove 140 can be recessed on the side of the first die head 120 facing the gasket 110, and the flow guide groove 140 can be recessed on the side of the second die head 130 facing the gasket 110. When the gasket 110 is clamped between the first die head 120 and the second die head 130, the opening of the flow guide groove 140 can be blocked by the gasket 110. The slurry flowing out of the slurry supply source 200 can flow into the flow guide groove 140 and contact the gasket 110, so that the slurry flows out through the first discharge port 111.

[0060] Referring to FIG. 7, FIG. 7 is a second structural schematic diagram of the coating system 1 according to one or more embodiments of the present application.

[0061] The slurry supply source 200 includes a first supply source and a second supply source, the first supply source supplies slurry to coat the main area 21 of the pole piece 20 via the first discharge port 111, and the second supply source supplies slurry to coat the thinned area 22 of the pole piece 20 via the second discharge port 112. The first supply source and the second supply source can exist independently of each other, that is, the first supply source and the second supply source are separately arranged. Or the first supply source and the second supply source are integrally arranged, that is, the slurry supply source 200 simultaneously includes two box bodies for storing slurry, one of which is the first supply source and the other is the second supply source. The first supply source can be communicated with the first discharge port 111 through a pipeline, so that the first supply source coats the main area 21 of the pole piece 20 via the first discharge port 111, and the second supply source can be communicated with the second discharge port 112 through a pipeline, so that the second supply source coats the thinned area 22 of the pole piece 20 via the second discharge port 112.

[0062] In summary, the coating die 100 has the first discharge port 111 and the second discharge port 112, the slurry is coated on the main area 21 of the pole piece 20 via the first discharge port 111, and the slurry is coated on the thinned area 22 of the pole piece 20 via the second discharge port 112, which can coat the main area 21 and the thinned area 22 with the same coating die 100, thereby improving the work efficiency of slurry coating, and the slurry of the thinned area 22 is supplied by the second discharge port 112, which can accurately control the amount of slurry coated on the thinned area 22 through the second discharge port 112, thereby improving the yield of the finished pole piece 20.

[0063] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; 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 be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating apparatus characterized by comprising: The coating device comprises: a coating die formed with a first discharge port and a second discharge port arranged adjacently; a slurry supply source connected to the coating die, the slurry supply source providing slurry to be coated on the main body region of the pole piece via the first discharge port and on the thinned region of the pole piece via the second discharge port.

2. The coating apparatus according to claim 1, characterized by The number of the second discharge ports is two, and the first discharge port is located between the two second discharge ports.

3. The coating apparatus according to claim 1 or 2, characterized in that, The coating device comprises a delivery pipe and an adjusting member, the delivery pipe being connected to the second discharge ports and the slurry supply source through the adjusting member, and the adjusting member being used to adjust the flow of slurry delivered to the second discharge ports.

4. The coating apparatus according to claim 3, characterized in that, The coating device further comprises a controller used to control the adjusting member to adjust the flow of slurry delivered to the second discharge ports.

5. The coating apparatus according to claim 4, wherein The coating device further comprises a thickness detector used to detect the thickness of the thinned region.

6. The coating apparatus according to any one of claims 1 to 5, characterized in that, The coating die comprises a first die, a second die and a gasket, the gasket being clamped between the first die and the second die, and the gasket being used to cooperate with at least one of the first die and the second die to form the first discharge port and the second discharge port.

7. The coating apparatus according to claim 6, characterized in that The gasket is provided with a slurry flow channel, one end of the slurry flow channel being connected to the slurry supply source, and the other end of the slurry flow channel cooperating with the first die or the second die to form the second discharge port.

8. The coating apparatus according to claim 7, characterized in that The ratio between the depth of the slurry flow channel and the thickness of the gasket is greater than 0 and less than or equal to 80%.

9. The coating apparatus according to any one of claims 6 to 8, characterized in that At least one of the first die and the second die is provided with a flow guide groove used to guide the slurry to flow out of the first discharge port.

10. The coating apparatus according to any one of claims 1 to 9, characterized in that The slurry supply source comprises a first supply source and a second supply source, the first supply source providing slurry to be coated on the main body region of the pole piece via the first discharge port, and the second supply source providing slurry to be coated on the thinned region of the pole piece via the second discharge port.

11. A coating system characterized in that, The coating system comprises a pole piece and the coating device according to any one of claims 1 to 10, the pole piece comprising a main body region and a thinned region, and the coating device being used to coat slurry on the main body region of the pole piece and the thinned region of the pole piece.

12. The coating system of claim 11, wherein, The ratio between the width of the second discharge port of the coating device and the width of the thinned region of the pole piece is greater than or equal to 10% and less than or equal to 1.

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