Coating device and battery manufacturing equipment

Abstract

The utility model discloses a coating device and battery manufacturing equipment. The coating device comprises a back roller assembly, a connecting assembly and an adjusting assembly. The back roller assembly comprises a ceramic roller and a center shaft, the center shaft is sleeved with the ceramic roller, and the ceramic roller can rotate in the axial direction and drive the pole pieces to move. The connecting assembly comprises a driving shaft and a connecting shaft, the driving shaft and the connecting shaft are arranged at the two ends of the center shaft correspondingly, and the driving shaft is used for being connected with a driving motor. The adjusting assembly is arranged between the driving shaft and the center shaft and can stretch out and draw back in the axial direction of the center shaft so as to adjust the distance between the center shaft and the driving shaft. According to the coating device and the battery manufacturing equipment, the thickness uniformity of the active substance layer on the pole piece in the battery can be improved, and the yield of the battery and the operation stability of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a coating device and battery manufacturing equipment. Background Art

[0002] The electrode plate is one of the important components in the battery. The electrode plate has an active material layer. The thickness uniformity of the active material layer plays a key role in the operation stability of the electrode plate. Therefore, how to improve the thickness uniformity of the active material coating is one of the technical issues studied in this field. Utility Model Content

[0003] In view of the above problems, the present application provides a coating device and a battery manufacturing equipment, which can improve the thickness uniformity of the active material layer on the electrode in the battery and improve the stability of the battery operation.

[0004] In the first aspect, the present application provides a coating device, including a back roller assembly, a connecting assembly and an adjusting assembly. The back roller assembly includes a ceramic roller and a central shaft, the ceramic roller is sleeved outside the central shaft, and the ceramic roller can rotate around the axis and drive the pole piece to move. The connecting assembly includes a drive shaft and a connecting shaft, the drive shaft and the connecting shaft are respectively arranged at both ends of the central shaft, and the drive shaft is used to connect the drive motor. The adjusting assembly is arranged between the drive shaft and the central shaft, and the adjusting assembly can be extended and retracted along the axial direction of the central shaft to adjust the distance between the central shaft and the drive shaft.

[0005] In the technical solution of the embodiment of the present application, a back roller assembly is provided to support the pole piece, improve the flatness of the pole piece surface, improve the stability of the coating process and the uniformity of the material coating thickness. The use of ceramic rollers improves the wear resistance of the roller surface, reduces the wear on the ceramic roller surface caused by friction during use, improves the flatness of the roller surface, and reduces the uneven material coating thickness caused by the uneven local force on the pole piece due to the wear of the roller surface. The replacement cycle of the roller is extended, the consistency of the thickness of the pole piece coating is improved, and the product quality and yield rate of the battery are improved. In addition, an adjustment component is provided to facilitate the adjustment of the distance between the central axis and the drive shaft to adapt to the assembly of ceramic rollers with higher hardness and improve the adaptability of the assembly process.

[0006] In some embodiments, one end of the central shaft is connected to a driving flange, one end of the driving shaft protrudes outward along the circumferential direction to form a first connecting portion, and the driving flange is connected to the first connecting portion. By providing the driving flange and the first connecting portion, the connection area between the central shaft and the driving shaft is increased, the connection strength is improved, and the stability of the pole piece movement process is improved.

[0007] In some embodiments, the adjustment assembly includes two gaskets and an elastic member. The two gaskets are stacked along the axial direction of the central axis, one of which is connected to the driving flange, and the other is connected to the first connecting portion. The elastic member is arranged between the two gaskets. In the above structure, by arranging the gasket and the elastic member, a certain expansion space can be provided for the installation of the central axis, adapting to the length of the ceramic roller, and improving the flexibility of assembly and the stability of the structure.

[0008] In some embodiments, the adjustment assembly further includes a connecting bolt, a first connecting portion is provided with a first connecting hole, two gaskets are provided with a second connecting hole, and a third connecting hole is provided on the driving flange, and the connecting bolt passes through the first connecting hole, the second connecting hole, and the third connecting hole in sequence to install the gasket between the central shaft and the driving shaft. In the above structure, the connecting bolt detachably connects the gasket to the driving shaft and the central shaft for easy replacement.

[0009] In some embodiments, the adjustment assembly further includes a spring washer, which is sleeved outside the connecting bolt, and can be extended and retracted along the axial direction of the central axis, and the two ends of the spring washer are respectively abutted against the gasket and the first connecting portion. By providing the spring washer, the adjustable range between the central axis and the driving shaft is further increased, and the flexibility of assembly is improved.

[0010] In some embodiments, a first annular step is connected to the side of the first connecting portion facing the ceramic roller, and one end of the ceramic roller is sleeved outside the first step to be clamped with the first connecting portion. By providing the first step to clamp the ceramic roller with the drive shaft, the assembly efficiency and the connection positioning accuracy are improved.

[0011] In some embodiments, the coating device further comprises a sealing connector, which is disposed between the first step and the ceramic roller. By providing the sealing connector, the connection strength between the ceramic roller and the first connecting portion is increased, the sealing performance is improved, and impurities and moisture are reduced from entering the interior of the ceramic roller.

[0012] In some embodiments, the sealing connector is disposed around the outer periphery of the first step. Disposing the sealing connector around the first step further improves the connection strength and sealing performance.

[0013] In some embodiments, the Rockwell hardness Q of the ceramic roller material is in the range of 80HRA≤Q≤96HRA. Within the above range, the surface of the ceramic roller can resist the wear caused by scraper friction, improve the flatness of the roller surface, thereby extending the service life of the roller and the quality of the battery product.

[0014] In some embodiments, the ceramic roller is any one of a silicon carbide ceramic roller, an aluminum nitride ceramic roller or a silicon nitride ceramic roller. In the above structure, the ceramic material has high wear resistance, corrosion resistance and thermal conductivity, low density and low linear expansion coefficient, which can reduce the flexural deformation of the roller during operation, improve the force balance of the pole piece, reduce the surface wear of the back roller during operation, and improve the consistency of the material coating thickness on the pole piece surface. The low linear expansion coefficient reduces the influence of the roller diameter change on the material coating weight, thereby improving the yield rate of the battery product.

[0015] In some embodiments, the coating device further includes a coating die head, and the Rockwell hardness of the coating die head material is less than the Rockwell hardness of the ceramic roller material. In the above structure, the hardness of the coating die head is less than the hardness of the ceramic roller material, which can reduce the wear of the roller surface caused by the friction between the coating die head and the ceramic roller surface, improve the flatness of the ceramic roller surface, and reduce the uneven material coating thickness caused by the uneven local force on the pole piece due to the wear of the roller surface. The replacement cycle of the roller is extended, the thickness consistency of the pole piece coating is improved, and the product quality and yield rate of the battery are improved.

[0016] In a second aspect, the present application provides a battery manufacturing device, which includes the coating device in the above embodiment.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0019] Figure 1 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0020] Figure 2 A schematic diagram of the structure of a coating device provided in some embodiments of the present application;

[0021] Figure 3 A schematic diagram of the exploded structure of a coating device provided in some embodiments of the present application;

[0022] Figure 4 A schematic structural diagram of a first connecting portion of a back roller assembly provided in some embodiments of the present application;

[0023] Figure 5 A schematic cross-sectional structure diagram of a back roller assembly provided in some embodiments of the present application;

[0024] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part A;

[0025] Figure 7 A schematic diagram of the structure of a coating device provided in some other embodiments of the present application.

[0026] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0027] 1. Battery cell; 10. Electrode assembly; 20. Shell; 30. End cover; 40. Outer shell; 2. Coating device; 201. Back roller assembly; 202. Connecting assembly; 203. Ceramic roller; 204. Adjusting assembly; 205. Drive shaft; 206. Connecting shaft; 207. Center shaft; 209. Sealing connector; 210. Connecting bolt; 211. Spring washer; 212. Drive flange; 213. First connecting part; 214. Connecting flange; 215. Second connecting part; 216. First step; 217. Coating die. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0030] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] 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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0038] Battery devices are widely used in various electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric ships, electric toy cars, electric toy planes, electric toy ships, electric tools and energy storage systems, etc. The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0039] Illustratively, a battery cell may be the smallest unit constituting a battery device.

[0040] Figure 1 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0041] like Figure 1 As shown, in some embodiments, the battery cell 1 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40. The housing 40 may include an end cap 30 and a shell 20.

[0042] The electrode assembly 10 includes a positive electrode sheet and a negative electrode sheet. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 also includes a separator disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and allow active ions to pass through. The battery cell 1 also includes an electrolyte contained in the housing 40. The electrolyte plays the role of conducting ions between the positive and negative electrodes.

[0043] Illustratively, the positive electrode plate includes a positive electrode current collector and an active material layer coated on the surface of the positive electrode current collector, and the negative electrode plate includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector.

[0044] During the coating process of the electrode sheet, the current collector moves between the feeding reel and the winding reel. The coating assembly is arranged on the moving path of the electrode sheet. The coating assembly coats the active material on the current collector through the coating die head. In order to improve the stability of the coating process, a back roller assembly is arranged on the side of the current collector away from the coating assembly. The back roller assembly fits the current collector and can rotate to provide power for the movement of the current collector.

[0045] The coating assembly and the back roller assembly are arranged opposite to each other. In the process of adjusting the relative position of the two, the coating die head may rub or collide with the barrel surface of the back roller and cause damage. In addition, during the operation of the back roller assembly, it contacts the surface of the pole piece, and the contact between the pole piece and the back roller is likely to cause certain damage to the roller surface of the back roller. These damages will cause the flatness of the barrel surface to decrease. After research, it was found that the above-mentioned barrel surface damage will cause changes in the thickness of the local film layer of the pole piece, reducing the yield rate of the pole piece.

[0046] Based on the above research results, an embodiment of the present application provides a coating device. In the coating device, a back roller assembly is provided to support the pole piece, improve the flatness of the pole piece surface, improve the stability of the coating process and the uniformity of the material coating thickness. The use of ceramic rollers improves the wear resistance of the roller surface, reduces the wear on the ceramic roller surface caused by friction during use, improves the flatness of the roller surface, and reduces the uneven material coating thickness caused by the uneven local force on the pole piece due to the wear of the roller surface. The replacement cycle of the roller is extended, the consistency of the thickness of the pole piece coating is improved, and the product quality and yield rate of the battery are improved. In addition, an adjustment component is provided to facilitate the adjustment of the distance between the central axis and the drive shaft to adapt to the assembly of ceramic rollers with higher hardness and improve the adaptability of the assembly process.

[0047] Please refer to Figure 2 as well as Figure 3 , Figure 2 A schematic diagram of the structure of a coating device provided in some embodiments of the present application; Figure 3 A schematic diagram of the exploded structure of a coating device provided in some embodiments of the present application.

[0048] As shown in the figure, the coating device 2 provided in the embodiment of the present application includes a back roller assembly 201, a connecting assembly 202 and an adjusting assembly 204. The back roller assembly 201 includes a ceramic roller 203 and a central shaft 207. The ceramic roller 203 is sleeved outside the central shaft 207. The ceramic roller 203 can rotate around the axis and drive the pole piece to move. The connecting assembly 202 includes a driving shaft 205 and a connecting shaft 206. The driving shaft 205 and the connecting shaft 206 are respectively arranged at both ends of the central shaft 207. The driving shaft 205 is used to connect the driving motor. The adjusting assembly 204 is arranged between the driving shaft 205 and the central shaft 207. The adjusting assembly 204 can be extended and retracted along the axial direction of the central shaft 207 to adjust the distance between the central shaft 207 and the driving shaft 205.

[0049] The back roller assembly 201 refers to an assembly for supporting and driving the pole piece to move. The roller of the back roller assembly 201 may be cylindrical. In order to reduce the weight of the ceramic roller 203, the ceramic roller 203 may be set as a hollow structure. The ceramic roller 203 has a complete and continuous roller surface. The ceramic roller 203 is not divided into a plurality of sub-rollers arranged along the axial direction, and there is no gap or opening on the surface of the ceramic roller 203.

[0050] The pole piece may be a current collector, or the pole piece may be a current collector on one side of which the surface has been coated with an active material.

[0051] The connecting assembly 202 is used to connect the ceramic roller 203 and the driving motor, transmit the kinetic energy of the motor to the back roller assembly 201, and drive the ceramic roller 203 and the central shaft 207 to rotate around the axial direction.

[0052] In the technical solution of the embodiment of the present application, a back roller assembly 201 is provided to support the pole piece, improve the flatness of the pole piece surface, improve the stability of the coating process and the uniformity of the material coating thickness. The use of a ceramic roller 203 improves the wear resistance of the roller surface, reduces the wear on the surface of the ceramic roller 203 caused by friction during use, improves the flatness of the surface of the ceramic roller 203, and reduces the uneven material coating thickness caused by the uneven local force on the pole piece due to the wear of the roller surface. The replacement cycle of the ceramic roller 203 is extended, the thickness consistency of the pole piece coating is improved, and the product quality and yield rate of the battery are improved. In addition, an adjustment assembly 204 is provided to facilitate the adjustment of the distance between the central axis 207 and the drive shaft 205 to adapt to the assembly of the ceramic roller 203 with higher hardness and improve the adaptability of the assembly process.

[0053] In some optional embodiments, the adjustment component 204 is also disposed between the connecting shaft 206 and the central shaft 207, further expanding the adjustment range.

[0054] In some embodiments of the present application, one end of the central shaft 207 is connected to a driving flange 212, one end of the driving shaft 205 protrudes outward along the circumferential direction to form a first connecting portion 213, and the driving flange 212 is connected to the first connecting portion 213. By providing the driving flange 212 and the first connecting portion 213, the connection area between the central shaft 207 and the driving shaft 205 is increased, the connection strength is improved, and the stability of the pole piece movement process is improved.

[0055] In some optional embodiments, the other end of the central axis 207 is connected to a connecting flange 214, one end of the connecting shaft 206 protrudes axially outward to form a second connecting portion 215, the connecting flange 214 is connected to the second connecting portion 215, and the adjustment assembly 204 is disposed between the connecting flange 214 and the second connecting portion 215.

[0056] In some embodiments of the present application, the adjustment assembly 204 includes two gaskets and an elastic member. The two gaskets are stacked along the axial direction of the central axis 207, one of the gaskets is connected to the driving flange 212, and the other gasket is connected to the first connecting portion 213. The elastic member is arranged between the two gaskets. Exemplarily, the adjustment assembly 204 is an integral structure to improve assembly efficiency and installation accuracy.

[0057] In the above structure, by arranging gaskets and elastic parts, a certain expansion space can be provided for the installation of the central axis 207 to adapt to the ceramic roller 203 with greater hardness. Even when there is a small error in the length of the ceramic roller 203, it can be installed to improve the assembly flexibility and structural stability.

[0058] In some embodiments of the present application, the adjustment assembly 204 further includes a connecting bolt 210, a first connecting hole is provided on the first connecting portion 213, a second connecting hole is provided on the two gaskets, and a third connecting hole is provided on the driving flange 212. The connecting bolt 210 passes through the first connecting hole, the second connecting hole, and the third connecting hole in sequence to install the gasket between the central shaft 207 and the driving shaft 205. In the above structure, the connecting bolt 210 detachably connects the gasket to the driving shaft 205 and the central shaft 207 for easy replacement.

[0059] In some embodiments of the present application, the adjustment assembly 204 further includes a spring washer 211, which is sleeved outside the connecting bolt 210, and the spring washer 211 can be extended and retracted along the axial direction of the central axis 207, and the two ends of the spring washer 211 are respectively abutted against the gasket and the first connecting portion 213. By providing the spring washer 211, the adjustable range between the central axis 207 and the driving shaft 205 is further increased, and the flexibility of assembly is improved.

[0060] like Figure 4 As shown, in some embodiments of the present application, a first annular step 216 is connected to one side of the first connection portion 213 facing the ceramic roller 203, and one end of the ceramic roller 203 is sleeved outside the first step 216 to be engaged with the first connection portion 213. The ceramic roller 203 is engaged with the drive shaft 205 by providing the first step 216, thereby improving assembly efficiency and connection positioning accuracy.

[0061] like Figure 5 as well as Figure 6 As shown, in some embodiments of the present application, the coating device 2 further includes a sealing connector 209, which is disposed between the first step 216 and the ceramic roller 203. By providing the sealing connector 209, the connection strength between the ceramic roller 203 and the first connecting portion 213 is improved, the sealing performance is improved, and the entry of impurities and moisture into the interior of the ceramic roller 203 is reduced.

[0062] In some embodiments of the present application, the sealing connector 209 is disposed around the outer circumference of the first step 216. The sealing connector is disposed around the first step 216 to further improve the connection strength and sealing performance.

[0063] In some embodiments of the present application, the Rockwell hardness Q of the material of the ceramic roller 203 has a value range of 80HRA≤Q≤96HRA.

[0064] Rockwell hardness is a method to assess the hardness of a material based on the depth of indentation. Rockwell hardness is divided into a variety of scales, the commonly used ones are HRA, HRB, and HRC. HRA refers to the use of a diamond cone indenter with a load of 60 kg (load 588N) and a diamond indenter with a cone angle of 120° pressed into the surface of the material being tested, thereby producing an indentation. The hardness expressed by the depth of the measured indentation is the Rockwell hardness.

[0065] Limiting the Rockwell hardness of the ceramic roller 203 material to above 80 HRA can not only reduce the deformation generated during the coating process, but also effectively prevent the damage caused during the contact between the pole piece and the ceramic roller 203, thereby maintaining the flatness of the surface of the ceramic roller 203 and improving the product performance of the battery cell 1. At the same time, the replacement time of the ceramic roller 203 is extended and the cost is reduced. Limiting the Rockwell hardness of the ceramic roller 203 material to below 96 HRA reduces excessive wear on the scraper and reduces the difficulty of obtaining the ceramic roller 203 material, which facilitates the manufacturing and production of the roller.

[0066] In some embodiments of the present application, the ceramic roller 203 is any one of a silicon carbide ceramic roller 203 , an aluminum nitride ceramic roller 203 , or a silicon nitride ceramic roller 203 .

[0067] Ceramic materials usually have a low density, which helps reduce the weight of the ceramic roller 203 and improve the overall performance of the device. The low linear expansion coefficient means that the diameter of the roller changes less when the temperature changes, which helps to reduce the fluctuation of the material coating weight caused by the change of the diameter of the ceramic roller 203 and improve the yield rate of battery products. The high rigidity of ceramic materials can reduce the flexural deformation of the ceramic roller 203 during operation, thereby improving the balance of the force on the pole piece and ensuring the consistency of the material coating thickness.

[0068] Aluminum nitride and silicon nitride ceramics have excellent thermal conductivity and can transfer heat quickly, which helps to maintain the temperature of the pole piece and material stable during the coating process and improve the coating quality.

[0069] Silicon carbide has high hardness and high wear resistance, and is suitable for coating environments that need to withstand greater friction and wear.

[0070] In addition to high wear resistance, aluminum nitride also has excellent thermal conductivity and is suitable for coating processes that require rapid heat dissipation. Silicon nitride combines high hardness, high wear resistance and good thermal stability, and is suitable for a variety of coating processes, especially in situations where wear resistance and thermal conductivity need to be considered at the same time. In some embodiments of the present application, the scraper is any one of a silicon carbide ceramic scraper, an aluminum nitride ceramic scraper or a silicon nitride ceramic scraper. The high wear resistance makes the service life of the ceramic scraper far longer than that of traditional materials (such as metal scrapers). This not only reduces the frequency of replacing the scraper and reduces maintenance costs, but also improves the continuity and stability of the production line. The ceramic scraper can apply the material more evenly and accurately, reduces the problem of uneven coating thickness caused by scraper wear, improves the uniformity and consistency of the battery pole piece, and thus improves the performance and quality of the entire battery product. Using a scraper of the same or similar material as the roller can ensure good matching between the two. This helps to reduce friction and wear caused by material mismatch and further improve the stability and efficiency of the coating process.

[0071] like Figure 7 As shown, in some embodiments of the present application, the coating device 2 also includes a coating die 217, and the Rockwell hardness of the material of the coating die 217 is less than the Rockwell hardness of the material of the ceramic roller 203. In the above structure, the hardness of the coating die 217 is less than the hardness of the material of the ceramic roller 203, which can reduce the wear of the roller surface caused by the friction between the coating die 217 and the surface of the ceramic roller 203, improve the flatness of the surface of the ceramic roller 203, and reduce the uneven material coating thickness caused by the uneven local force of the pole piece due to the wear of the roller surface. The replacement cycle of the ceramic roller 203 is extended, the thickness consistency of the pole piece coating is improved, and the product quality and yield rate of the battery are improved.

[0072] In some optional embodiments, the coating device 2 includes a back roller assembly 201, a connecting assembly 202 and an adjusting assembly 204. The back roller assembly 201 includes a ceramic roller 203 and a central shaft 207, and the ceramic roller 203 is sleeved outside the central shaft 207. The ceramic roller 203 can rotate around the axial direction and drive the pole piece to move. The connecting assembly 202 includes a driving shaft 205 and a connecting shaft 206, and the driving shaft 205 and the connecting shaft 206 are respectively arranged at both ends of the central shaft 207, and the driving shaft 205 is used to connect the driving motor. The adjusting assembly 204 is arranged between the driving shaft 205 and the central shaft 207, and the adjusting assembly 204 can be extended and retracted along the axial direction of the central shaft 207 to adjust the distance between the central shaft 207 and the driving shaft 205. One end of the central shaft 207 is connected to a driving flange 212, and one end of the driving shaft 205 protrudes outward along the circumferential direction to form a first connecting portion 213, and the driving flange 212 is connected to the first connecting portion 213. The adjustment assembly 204 includes two washers and an elastic member. The two washers are stacked along the axial direction of the central axis 207, one of which is connected to the driving flange 212, and the other is connected to the first connecting portion 213. The elastic member is arranged between the two washers. The adjustment assembly 204 also includes a connecting bolt 210 and a spring washer 211. The first connecting portion 213 is provided with a first connecting hole, the two washers are provided with a second connecting hole, and the driving flange 212 is provided with a third connecting hole. The connecting bolt 210 passes through the first connecting hole, the second connecting hole and the third connecting hole in sequence to install the washers between the central axis 207 and the driving shaft 205. The spring washer 211 is sleeved outside the connecting bolt 210, and the spring washer 211 can be extended and retracted along the axial direction of the central axis 207, and the two ends of the spring washer 211 are respectively abutted against the washers and the first connecting portion 213. The first connecting portion 213 is connected to a first annular step 216 on one side facing the ceramic roller 203. One end of the ceramic roller 203 is sleeved outside the first step 216 to engage with the first connecting portion 213. The coating device 2 further includes a sealing connector 209, which is disposed between the first step 216 and the ceramic roller 203.

[0073] The embodiment of the present application also provides a battery manufacturing device, which includes the coating device 2 in the above embodiment. A back roller assembly 201 is provided in the coating device 2 to support the pole piece, improve the flatness of the pole piece surface, improve the stability of the coating process and the uniformity of the material coating thickness. The use of a ceramic roller 203 improves the wear resistance of the surface of the ceramic roller 203, reduces the wear on the surface of the ceramic roller 203 caused by friction during use, improves the flatness of the roller surface, and reduces the uneven material coating thickness caused by the uneven local force on the pole piece due to the wear of the roller surface. The replacement cycle of the ceramic roller 203 is extended, the thickness consistency of the pole piece coating is improved, and the product quality and yield rate of the battery are improved. In addition, an adjustment component 204 is provided to facilitate the adjustment of the distance between the central axis 207 and the drive shaft 205 to adapt to the assembly of the ceramic roller 203 with higher hardness and improve the adaptability of the assembly process.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating device, characterized in that: include: The back roller assembly includes a ceramic roller and a central shaft, wherein the ceramic roller is sleeved outside the central shaft, and the ceramic roller can rotate around the axial direction and drive the pole piece to move; A connecting assembly, comprising a driving shaft and a connecting shaft, wherein the driving shaft and the connecting shaft are respectively arranged at two ends of the central shaft, and the driving shaft is used to connect to a driving motor; The adjusting component is arranged between the driving shaft and the central shaft, and the adjusting component can be extended and retracted along the axial direction of the central shaft to adjust the distance between the central shaft and the driving shaft.

2. The coating device according to claim 1, characterized in that: One end of the central shaft is connected to a driving flange, one end of the driving shaft protrudes outward along the circumferential direction to form a first connecting portion, and the driving flange is connected to the first connecting portion.

3. The coating device according to claim 2, characterized in that: The adjustment component comprises: Two gaskets are stacked along the axial direction of the central axis, wherein one of the gaskets is connected to the driving flange, and the other gasket is connected to the first connecting portion; The elastic member is arranged between the two gaskets.

4. The coating device according to claim 3, characterized in that: The adjustment assembly also includes a connecting bolt, a first connecting part is provided with a first connecting hole, the two gaskets are provided with a second connecting hole, and the driving flange is provided with a third connecting hole. The connecting bolt passes through the first connecting hole, the second connecting hole and the third connecting hole in sequence to install the gasket between the center shaft and the driving shaft.

5. The coating device according to claim 4, characterized in that: The adjustment assembly also includes a spring washer, which is sleeved outside the connecting bolt. The spring washer can be extended and retracted along the axial direction of the central axis, and two ends of the spring washer are respectively in contact with the gasket and the first connecting portion.

6. The coating device according to claim 4, characterized in that: A first annular step is connected to a side of the first connecting portion facing the ceramic roller, and one end of the ceramic roller is sleeved outside the first step to be engaged with the first connecting portion.

7. The coating device according to claim 6, characterized in that: The coating device further comprises a sealing connection member, and the sealing connection member is arranged between the first step and the ceramic roller.

8. The coating device according to claim 7, characterized in that: The sealing connection member is arranged around the outer circumference of the first step.

9. The coating device according to any one of claims 1 to 8, characterized in that: The Rockwell hardness Q of the material of the ceramic roller has a value range of 80HRA≤Q≤96HRA.

10. The coating device according to claim 9, characterized in that: The ceramic roller is any one of a silicon carbide ceramic roller, an aluminum nitride ceramic roller or a silicon nitride ceramic roller.

11. The coating device according to claim 9, characterized in that: The coating device further comprises a coating die head, and the Rockwell hardness of the material of the coating die head is smaller than the Rockwell hardness of the material of the ceramic roller.

12. A battery manufacturing device, characterized in that: The coating device comprises the coating device as claimed in any one of claims 1 to 11.

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