Pole piece production equipment and pole piece production system

Abstract

The utility model discloses pole piece production equipment and a pole piece production system. The pole piece production equipment comprises a conveying device, a coating device, a drying device and a vibration device, wherein the conveying device is used for conveying a current collector; the coating device is located on the conveying path and used for coating the first surface of the current collector with slurry; the drying device comprises a drying station which is used for drying the slurry. The vibration device is located between the coating device and the drying station and comprises a vibration main body part and at least two vibration generators connected with the vibration main body part, and the at least two vibration generators drive the vibration main body part to apply vibration to the second surface. Therefore, the coating device coats the first surface with slurry, the vibration main body part generates and applies vibration integrated by the plurality of vibration generators to the second surface by controlling the vibration direction, frequency and amplitude of each vibration generator, and the slurry subjected to vibration flattening treatment is subjected to drying treatment through the drying station. And the consistency of the weight of the dried pole piece can be improved.

Description

Technical Field

[0001] This application relates to the technical field of battery processing, and particularly to a pole piece production device and a pole piece production system. Background Art

[0002] Energy conservation and emission reduction are the keys to sustainable development, which has promoted the adjustment of the energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycling ability, high working voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0003] In the production process of battery pole pieces, it is usually necessary to coat the slurry on the current collector, and then dry the slurry to form the battery pole piece. However, during the process of coating the slurry on the current collector to drying the slurry, the problem of uneven distribution of the slurry on the current collector is likely to occur, resulting in a large fluctuation in the weight distribution of the dried and formed battery pole piece, and poor consistency of the pole piece weight. Summary of the Utility Model

[0004] The main purpose of this application is to provide a pole piece production device and a pole piece production system, aiming to solve the above technical problems existing in the prior art.

[0005] To solve the above problems, this application provides a pole piece production device, which includes a conveying device, a coating device, a drying device, and a vibration device. The conveying device is used to convey the current collector along the conveying path; the coating device is located on the conveying path and is used to coat the slurry on the first surface of the current collector; the drying device is located downstream of the coating device on the conveying path, and the drying device has a drying station for drying the slurry on the first surface. The vibration device is located between the coating device and the drying station on the conveying path. The vibration device includes a vibration main body part and at least two vibration generators. The at least two vibration generators are connected to the vibration main body part, and the at least two vibration generators jointly apply vibration to the vibration main body part to make the vibration main body part apply vibration to the second surface of the current collector, where the first surface and the second surface are arranged opposite to each other. Thus, the coating device is used to coat the slurry on the first surface of the current collector. The vibration device is located between the coating device and the drying station on the transmission path, and the vibration device includes a vibration main body part and at least two vibration generators connected to the vibration main body part. Multiple vibration generators can simultaneously apply vibration to the vibration main body part, and then the vibration effect of the vibration main body part can be controlled by adjusting parameters such as the vibration direction, vibration amplitude, and vibration frequency of each vibration generator. The vibration main body part then applies the vibration synthesized by multiple vibration generators to the slurry through the second surface, improving the uniformity and efficiency of slurry leveling. The leveled slurry is then dried by the drying device, and thus the consistency of the weight of the pole piece after drying can be improved.

[0006] In some embodiments, at least two vibration generators are divided into at least one group of vibrator groups, and at least two vibration generators in the vibrator group are arranged at intervals along the conveying path. Thus, at least two vibration generators in the same vibrator group are arranged at intervals along the conveying path, extending the vibration path of the vibration main body along the conveying path, making the vibration received by the slurry on the first surface more uniform, facilitating the leveling of the slurry, and further improving the consistency of the weight of the electrode sheet.

[0007] In some embodiments, the number of vibrator groups is at least two groups, and at least two groups of vibrator groups are arranged at intervals in the lateral direction, where the lateral direction is parallel to the second surface and intersects the conveying path. Thus, the number of vibrator groups is at least two groups, and different groups of vibrator groups are arranged at intervals in the lateral direction, enabling the vibration main body to be stably supported by multiple vibrator groups, and multiple vibration generators are arranged at intervals in both the conveying direction and the lateral direction, so that the intensity of the vibration received by the slurry on the first surface is more uniform, which is more conducive to the leveling treatment of the slurry, improving the leveling efficiency and further improving the consistency of the weight of the electrode sheet after drying.

[0008] In some embodiments, each vibration generator drives the vibration main body to apply a vibration perpendicular to the second surface to the second surface. Thus, each vibration generator drives the vibration main body to apply a vibration perpendicular to the second surface to the second surface, so that the slurry receives a vibration perpendicular to the second surface, facilitating the leveling of the slurry, and further improving the consistency of the weight of the electrode sheet.

[0009] In some embodiments, the vibration device further includes a mounting base, and a plurality of vibration generators are fixed on the mounting base. Thus, the vibration device includes a mounting base, and a plurality of vibration generators are fixed on the mounting base, which can improve the fixing efficiency of the plurality of vibration generators, and at the same time, it is convenient to adjust the position of each vibration generator through the mounting base, and then control parameters such as the vibration direction, amplitude, and frequency applied by each vibration generator to the vibration main body.

[0010] In some embodiments, the vibration main body includes a contact arc surface that protrudes toward the second surface. Thus, the vibration main body includes a contact arc surface that protrudes toward the second surface based on the vibration main body, so as to be able to fit with the second surface through the protruding part of the contact arc surface to apply vibration to the second surface, reducing the contact area between the vibration main body and the current collector, and further improving the large degree of wear caused by the current collector during the tape running process.

[0011] In some embodiments, the size of the contact arc surface in the lateral direction is greater than the size of the second surface in the lateral direction, where the lateral direction is parallel to the second surface and intersects the conveying path. Thus, the size of the contact arc surface in the lateral direction is greater than the size of the second surface in the lateral direction, such that the second surface can be attached to the contact arc surface in the lateral direction. During the tape running process of the current collector, the slurry at each position can be subjected to the vibration transmitted by the contact arc surface, facilitating the leveling of the slurry. After drying the leveled slurry, the consistency of the weight of the electrode sheet can be improved.

[0012] In some embodiments, the drying device includes a coating oven; the drying station and the vibration device are located inside the coating oven; or the drying station is located inside the coating oven and the vibration device is located outside the coating oven. Thus, the drying device includes a coating oven, and the drying station is located inside the coating oven, so that the current collector is heated more uniformly and the heat dissipation in the drying station is reduced, improving the drying efficiency of the slurry. Whether the vibration device is located inside the coating oven or outside the coating oven, it can apply vibration to the slurry on the first surface by using the vibration device before the slurry is dried, so as to level the slurry and improve the consistency of the weight of the electrode sheet.

[0013] In some embodiments, the conveying device includes a backing roller and a plurality of guide rollers, the backing roller and the plurality of guide rollers are arranged at intervals in sequence along the conveying path, the backing roller and the coating device are arranged opposite to each other, the vibration device is arranged between the backing roller and the guide rollers, or the vibration device is arranged between two guide rollers. Thus, the conveying device includes a backing roller and a plurality of guide rollers, the backing roller cooperates with the coating device to coat the slurry on the current collector, the backing roller and the plurality of guide rollers jointly guide the current collector to move on the conveying path, the vibration device can be arranged between the backing roller and the adjacent guide roller, or can be arranged between two guide rollers, which can reduce the interference between the vibration device and the conveying device, and at the same time enable the slurry coated on the current collector to be subjected to the vibration generated by the vibration device before being dried, thereby facilitating the leveling of the slurry during the tape running of the current collector and improving the consistency of the weight of the electrode sheet.

[0014] To solve the above problems, the present application provides a production system for electrode sheets, and the production system for electrode sheets includes the above-mentioned production equipment for electrode sheets. Description of the Drawings

[0015] 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 required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a schematic structural diagram of a production equipment for electrode sheets from a first perspective according to one or more embodiments;

[0017] Figure 2 It is a schematic structural diagram of a second perspective of a pole piece production device according to one or more embodiments;

[0018] Figure 3 It is a schematic structural diagram of a drying device according to one or more embodiments;

[0019] Figure 4 It is an exploded schematic structural diagram of a vibration device according to one or more embodiments;

[0020] Figure 5 It is a schematic structural diagram of a pole piece production system according to one or more embodiments.

[0021] Reference numerals in the drawings: Pole piece production device 10; Conveying device 100; Back roller 110; Guide roller 120; Coating device 200; Drying device 300; Drying station 310; Coating oven 311; Vibration device 400; Vibration generator 410; Vibration main body 420; Contact arc surface 421; Mounting base 430; Vibration group 440; Current collector 500; First surface 510; Second surface 520; Pole piece production system 20; Conveying path X; Lateral direction Y. Detailed implementation manners

[0022] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0025] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase may not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0027] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside 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 specific circumstances.

[0030] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydroelectric, thermal, wind, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0031] The battery device may include a box body and battery cells, and the battery cells are accommodated in the box body. In the battery device, there may be multiple battery cells, and the multiple battery cells may be connected in series, in parallel, or in a combined series-parallel connection. The combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells may be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells is accommodated in the box body; of course, the battery device may also be that multiple battery cells are first connected in series, in parallel, or in a combined series-parallel connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box body. The battery device may further include other structures. For example, the battery device may further include a busbar component for realizing the electrical connection among the multiple battery cells.

[0032] The manufacturing methods of battery cells include the stacking type and the winding type, that is, the battery cells are divided into two types: stacked batteries and wound batteries. Stacked batteries have uniform current collection effect, relatively small internal resistance of the battery, and high specific power. However, in order to improve accuracy, extremely high requirements are imposed on the mold accuracy, the equipment investment is high, and the process is relatively complex, resulting in low production efficiency. Wound batteries are simple to manufacture, and the requirements for equipment accuracy in the processes of sheet making and assembly are general, with high production efficiency and low cost. In terms of performance, wound batteries have excellent high and low temperature performance, can be charged very quickly, have an extremely long service life, a stable high output voltage, and a strong and earthquake-resistant structure.

[0033] A battery cell refers to the smallest unit that makes up a battery. A battery cell may include a housing, an electrode assembly, and other functional components.

[0034] The housing includes an end cap and a shell. The end cap refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap may be adapted to the shape of the shell to cooperate with the shell. Optionally, the end cap may be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap is not easily deformed when subjected to extrusion and collision, enabling the battery cell to have higher structural strength and improved safety performance. The shell is a component used to cooperate with the end cap to form the internal environment of the battery cell. Among them, the formed internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The shell and the end cap may be independent components. An opening may be provided on the shell, and the end cap is covered at the opening to form the internal environment of the battery cell.

[0035] The electrode assembly is a component in the battery cell where an electrochemical reaction occurs. The shell may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or laminating the electrode plates. For example, the electrode plates may include a positive electrode plate and a negative electrode plate, which are formed by winding or laminating the positive electrode plate and the negative electrode plate, and usually an isolation member is provided between the positive electrode plate and the negative electrode plate.

[0036] The electrode can include a current collector and an active coating. The active coating is located on the surface of the current collector. During the production process of the battery electrode, it is usually necessary to coat the slurry on the current collector and then dry the slurry to form the battery electrode. However, during the process of coating the slurry on the current collector to drying the slurry, the problem of uneven distribution of the slurry on the current collector is likely to occur, resulting in a large fluctuation in the weight distribution of the dried and formed battery electrode and poor consistency of the electrode weight.

[0037] To solve the technical problems in the related art, the present application provides an electrode production device and an electrode production system. The electrode production device includes a conveying device, a coating device, a drying device, and a vibration device. The vibration device is located between the coating device and the drying device. The vibration device applies vibration to the current collector coated with the slurry conveyed by the conveying device to level the slurry. The vibration device includes a vibration main body part and at least two vibration generators. The multiple vibration generators jointly drive the vibration main body part to apply vibration to the second surface of the current collector, which is more conducive to the uniform distribution of the slurry on the current collector, thereby improving the consistency of the electrode weight.

[0038] Specifically, refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a first perspective of an electrode production device according to one or more embodiments. Figure 2 is a schematic structural diagram of a second perspective of an electrode production device according to one or more embodiments.

[0039] The electrode production device 10 includes a conveying device 100, a coating device 200, a drying device 300, and a vibration device 400. The conveying device 100 is used to convey the current collector 500 along the conveying path X. The coating device 200 is located on the conveying path X and is used to coat the slurry on the first surface 510 of the current collector 500. The drying device 300 is located downstream of the coating device 200 on the conveying path X. The drying device 300 has a drying station 310, and the drying station 310 is used to dry the slurry on the first surface 510. The vibration device 400 is located between the coating device 200 and the drying station 310 on the conveying path X. The vibration device 400 includes a vibration main body part 420 and at least two vibration generators 410. The at least two vibration generators 410 are connected to the vibration main body part 420. The at least two vibration generators 410 jointly apply vibration to the vibration main body part 420 to make the vibration main body part 420 apply vibration to the second surface 520 of the current collector 500, wherein the first surface 510 and the second surface 520 are arranged opposite to each other.

[0040] The current collector 500 can be a positive current collector or a negative current collector, and the slurry includes, but is not limited to, a positive active material and a negative active material. The slurry of the positive active material can be coated on the positive current collector and dried to form a positive electrode sheet, and the slurry of the negative active material can be coated on the negative current collector and dried to form a negative electrode sheet.

[0041] Among them, the positive current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). As an example, the positive active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide and their respective modified compounds, and other conventional materials that can be used as the positive active material of the battery can also be used for the positive active material. These positive active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate, a composite material of lithium iron phosphate and carbon, lithium manganese phosphate, a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide and their modified compounds, etc.

[0042] The negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The negative electrode active material can be a negative electrode active material for battery cells known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0043] The conveying device 100 is used to convey the current collector 500 on the conveying path X. The coating device 200 is located on the conveying path X and is arranged adjacent to the conveying device 100 so that the conveying device 100 and the first surface 510 of the current collector 500 can be oppositely arranged. Then, during the process of the conveying device 100 conveying the current collector 500 on the conveying path X, the coating device 200 can coat the slurry on the first surface 510 of the current collector 500. The coating device 200 can coat the slurry on the current collector 500 by coating methods such as transfer roll coating or slit extrusion coating. Optionally, the coating method of the coating device 200 can be slit extrusion coating, and the slit extrusion coating has the advantages of fast coating speed and better thickness consistency of the slurry on the surface of the current collector 500. The drying device 300 is located downstream of the coating device 200 on the conveying path X. The drying device 300 includes a drying station 310. The conveying device 100 conveys the current collector 500 coated with the slurry and passes through the drying station 310. Heat can be generated at the drying station 310 to evaporate most of the solvent in the slurry, and then the slurry is dried and fixed on the current collector 500.

[0044] In order to further improve the thickness consistency of the slurry, the electrode sheet production equipment 10 further includes a vibration device 400. The vibration device 400 is located between the coating device 200 and the drying station 310 on the conveying path X. After the coating device 200 coats the slurry on the first surface 510, the conveying device 100 conveys the current collector 500 through the vibration device 400. The vibration device 400 applies vibration to the second surface 520 opposite to the first surface 510. Before the slurry is dried by passing through the drying station 310, after the slurry is leveled by the vibration device 400, the slurry can be evenly distributed on the current collector 500. Specifically, the vibration device 400 includes a vibration main body 420 and at least two vibration generators 410 connected thereto. The at least two vibration generators 410 jointly apply vibration to the vibration main body 420, and the vibration main body 420 applies vibration to the second surface 520 of the current collector 500, so that the vibration is transmitted to the slurry located on the first surface 510 through the current collector 500, enabling the slurry to indirectly receive the vibration transmitted by the at least two vibration generators 410, which is beneficial to leveling the slurry on the first surface 510. The vibration applied by the vibration main body 420 to the second surface 520 can also be controlled by adjusting parameters such as the vibration direction, vibration amplitude, and vibration frequency of the at least two vibration generators 410, so that the vibration main body 420 generates vibration integrated from the vibration emitted by the at least two vibration generators 410, which is more beneficial to improving the efficiency of leveling the slurry and the uniformity of the distribution of the slurry on the first surface 510. The leveled slurry is then dried by the drying device 300, and thus the consistency of the weight of the dried electrode sheet can be improved.

[0045] In this embodiment, the vibration generator 410 may include an ultrasonic vibrator or an ultrasonic motor. The vibration emitted by the ultrasonic vibrator and the ultrasonic motor is a mechanical wave, and the frequency can exceed 20KHZ, having strong penetrability and directivity. The vibration frequency and vibration amplitude of the vibration generator 410 can also be precisely controlled, which is beneficial to leveling the slurry. Specifically, the vibration frequency of the vibration generator 410 can be in the range of 20KHZ ± 500HZ, and the amplitude can be in the range of 5μm - 100μm, having a good leveling effect on the slurry.

[0046] In some embodiments, such as Figure 2As shown, the conveying device 100 includes a backing roller 110 and a plurality of idler rollers 120. The backing roller 110 and the plurality of idler rollers 120 are arranged at intervals in sequence along the conveying path X. The backing roller 110 is disposed opposite to the coating device 200. The vibration device 400 is disposed between the backing roller 110 and the idler rollers 120, or the vibration device 400 is disposed between two idler rollers 120. The backing roller 110 and the plurality of idler rollers 120 are rotationally engaged to convey the current collector 500. The vibration device 400 can be disposed between the backing roller 110 and an adjacent idler roller 120 or between two idler rollers 120, and the vibration device 400 can have a gap with the backing roller 110 and the idler rollers 120, thereby reducing the risk that the vibration generated by the rotation of the idler rollers 120 and the backing roller 110 affects the vibration device 400 during vibration, resulting in uneven vibration received by the second surface 520. Thus, the conveying device 100 includes a backing roller 110 and a plurality of idler rollers 120. The backing roller 110 cooperates with the coating device 200 to coat the slurry on the current collector 500. The backing roller 110 and the plurality of idler rollers 120 jointly guide the current collector 500 to move on the conveying path X. The vibration device 400 can be disposed between the backing roller 110 and the idler roller 120 adjacent to the backing roller 110, or can be disposed between two idler rollers 120, which can reduce the influence caused by interference between the vibration device 400 and the conveying device 100. At the same time, the slurry coated on the current collector 500 can be vibrated by the vibration device 400 before being dried, thereby facilitating the leveling of the slurry when the current collector 500 is running and improving the consistency of the weight of the electrode sheet.

[0047] In some embodiments, the drying device 300 includes a coating oven 311. The drying station 310 is located inside the coating oven 311, and the vibration device 400 is located outside the coating oven 311. The coating oven 311 has an accommodating space for arranging the drying station 310. The coating oven 311 can have openings on both sides of the conveying path X, and a part of the current collector 500 located in the drying device 300 passes through the coating oven 311 through the two openings. The drying station 310 generates heat to dry the slurry on the first surface 510. In addition, the vibration device 400 is located outside the coating oven 311, so that the slurry on the first surface 510 can be vibrated by the vibration transmitted by the vibration device 400 before receiving heat. Thus, the drying device 300 includes a coating oven 311, and the drying station 310 is located inside the coating oven 311 to reduce heat dissipation, improve drying efficiency and reduce energy consumption. The vibration device 400 is located outside the coating oven 311, so that the slurry can be vibrated by the vibration device 400 before receiving heat to level the slurry. After the slurry is leveled, it passes through the coating oven 311 to dry the slurry, and a battery electrode sheet with an active coating uniformly distributed on the current collector 500 is obtained, improving the consistency of the weight of the electrode sheet.

[0048] See Figure 3 ,Figure 3 It is a schematic structural diagram of a drying device according to one or more embodiments.

[0049] In some other embodiments, the drying device 300 includes a coating oven 311, a drying station 310 and a vibration device 400 are located inside the coating oven 311. Figure 3 The area within the dashed box in the figure can be the drying station 310. The drying station 310 is located within the accommodation space of the coating oven 311, which can reduce heat loss. Part of the current collector 500 passes through the coating oven 311 in the conveying direction X to dry the slurry. The vibration device 400 is located inside the coating oven 311, and the vibration device 400 needs to be located upstream of the drying station 310 on the conveying path X, so that the slurry is vibrated by the vibration device 400 before being dried. Thus, the drying device 300 includes a coating oven 311, the drying station 310 is located inside the coating oven 311, and the vibration device 400 is located inside the coating oven 311, which can increase the path of the current collector 500 being vibrated on the conveying path X, increase the time for the slurry to be vibrated per unit area in the transverse direction Y, so that the slurry is fully vibrated, and further the slurry is vibrated before being dried. After the slurry is dried, a pole piece with a uniformly distributed active coating on the first surface can be obtained, which is more conducive to improving the consistency of the pole piece weight.

[0050] In addition, in the two embodiments where the drying station 310 is located inside the coating oven 311 and the vibration device 400 is located inside or outside the coating oven 311, the number of coating ovens 311 can be set to be multiple. The multiple coating ovens 311 are arranged in sequence and connected to each other along the conveying path X to reduce heat dissipation and improve drying efficiency. On this basis, the conveying speed of the conveying device 100 can be appropriately increased, and further the production efficiency of the pole piece can be improved. The coating oven 311 can also be provided with air vents to discharge the solvent volatilized from the slurry out of the coating oven 311, reducing the risk of the solvent being accumulated in the coating oven 311, thereby improving the drying effect of the slurry. The coating oven 311 can also include a guide roller 120 to keep the current collector 500 flat during the conveying process.

[0051] In some embodiments, each vibration generator 410 drives the vibration main body 420 to apply vibrations perpendicular to the second surface 520 to the second surface 520. The vibration generator 410 is a vibration source. The vibration generator 410 can be located on the side of the vibration main body 420 away from the current collector 500. The vibration generator 410 indirectly applies vibrations to the second surface 520 through the vibration main body 420, which can reduce the risk that the vibrations generated by the vibration generator 410 driving the vibration main body 420 interfere with the vibrations emitted by the vibration generator 410 itself and affect the slurry. Further, at least two vibration generators 410 can be arranged at intervals, and at least two vibration generators 410 can be evenly distributed on the side of the vibration main body 420 away from the current collector 500, so that the vibrations received by the slurry are relatively uniform. Thus, each vibration generator 410 drives the vibration main body 420 to apply vibrations perpendicular to the second surface 520 to the second surface 520, so that the slurry receives vibrations perpendicular to the second surface 520, which is convenient for leveling the slurry, and further can improve the consistency of the weight of the electrode sheet.

[0052] See Figure 4 , Figure 4 is an exploded structural schematic diagram of a vibration device according to one or more embodiments.

[0053] In some embodiments, the vibration device 400 further includes a mounting base 430, and a plurality of vibration generators 410 are fixed to the mounting base 430. The plurality of vibration generators 410 are located between the mounting base 430 and the vibration main body 420, and both ends of the plurality of vibration generators 410 are respectively connected to the mounting base 430 and the vibration main body 420. The mounting base 430 simultaneously provides a mounting position for the plurality of vibration devices 400. Thus, the vibration device 400 includes the mounting base 430, and the plurality of vibration generators 410 are fixed to the mounting base 430, which can improve the fixing efficiency of the plurality of vibration generators 410, and at the same time can also facilitate adjusting the position of each vibration generator 410 through the mounting base 430, and further regulating parameters such as the vibration direction, amplitude, and frequency applied by each vibration generator 410 to the vibration main body 420.

[0054] In some embodiments, the mounting base 430 may further include a base bottom plate and a base surrounding wall. The base bottom plate provides a reference surface. The base surrounding wall is disposed along the circumference of the base bottom plate and is located on the side of the base bottom plate close to the vibration main body 420, thereby improving the strength of the mounting base 430. The base bottom plate may be a square plate, and the base surrounding wall may be a square frame, which is convenient for the regular arrangement of the vibration generators 410 and is more conducive to making the slurry receive uniform vibration. The base surrounding wall is located on the side of the base bottom plate close to the vibration main body 420. The vibration generator 410 may be located on the side of the base surrounding wall away from the base bottom plate and may be located at the inflection point of the base surrounding wall, so that the vibration generator 410 can be more stably fixed to the mounting base 430. The mounting base 430 may further include cross beams and / or vertical beams. The cross beams and / or vertical beams may be crosswise located within the base surrounding wall and connect the opposite inner walls of the base surrounding wall to further improve the stability of the mounting base 430 and also provide installation positions for more vibration generators 410. More vibration generators 410 may be installed at the intersection positions of the cross beams, vertical beams and the base surrounding wall, so that the vibration received by the current collector 500 is more uniform and the consistency of the pole piece weight can be improved.

[0055] In some embodiments, the vibration main body 420 includes a contact arc surface 421 that protrudes toward the second surface 520. The contact arc surface 421 may be a circular arc, an elliptical arc or a curved surface with a curvature, and the contact arc surface 421 protrudes toward the second surface 520 to reduce the contact area between the vibration main body 420 and the second surface 520. Thus, the vibration main body 420 includes the contact arc surface 421, and the contact arc surface 421 protrudes toward the second surface 520 based on the vibration main body 420, so as to be able to fit with the second surface 520 through the protruding part of the contact arc surface 421 to apply vibration to the second surface 520 and reduce the contact area between the vibration main body 420 and the current collector 500, thereby improving the large-degree wear caused by the current collector 500 during the tape running process.

[0056] In some embodiments, the size of the contact arc surface 421 in the transverse direction Y is larger than the size of the second surface 520 in the transverse direction Y, where the transverse direction Y is parallel to the second surface 520 and intersects with the conveying path X. The unit area of the second surface 520 of the current collector 500 in the transverse direction Y is in contact with the protruding part of the contact arc surface 421 toward the second surface 520. Thus, the size of the contact arc surface 421 in the transverse direction Y is larger than the size of the second surface 520 in the transverse direction Y, so that the second surface 520 can be in contact with the contact arc surface 421 in the transverse direction Y, and during the tape running process of the current collector 500, each position of the slurry can receive the vibration transmitted by the contact arc surface 421, which is convenient for leveling the slurry. After drying the leveled slurry, the consistency of the pole piece weight can be improved.

[0057] In some embodiments, at least two vibration generators 410 are divided into at least one group of vibrator groups 440. The vibrator group 440 includes at least two vibration generators 410, and the at least two vibration generators 410 of the vibrator group 440 are spaced along the conveying path X. For the convenience of understanding, the following examples are given. The vibration device 400 includes at least 2 vibration generators 410. The vibration device 400 includes at least one vibrator group 440, and one vibrator group 440 includes at least 2 vibration generators 410. Exemplarily, the vibration device 400 includes one vibrator group 440, and one vibrator group 440 may include 2, 3, 4, 5 or 6 vibration generators 410. When the vibration device 400 includes 4, 5 or 6 vibration generators 410 and further includes two vibrator groups 440, each vibrator group 440 may respectively include 2 or 3 vibration generators 410. When the vibration device 400 includes 6 or more vibration generators 410 and further includes at least three vibrator groups 440, each vibrator group 440 may respectively include at least 2 vibration generators 410. As Figure 4 shown, the dashed box may represent a vibrator group 440. At least two vibration generators 410 are divided into one group of vibrator groups 440, and one vibrator group 440 includes at least two vibration generators 410. The at least two vibration generators 410 included in one vibrator group 440 are spaced along the conveying path X. Thus, the at least two vibration generators 410 of the same vibrator group 440 are spaced along the conveying path X to extend the vibration path of the vibration main body 420 on the conveying path X, so that the vibration received by the slurry on the first surface 510 is more uniform, facilitating the leveling of the slurry, and further improving the consistency of the weight of the pole piece. In this embodiment, one group of vibrator groups 440 may include two vibration generators 410, and the two vibration generators 410 are spaced along the conveying path X to extend the path of the second surface 520 receiving vibration on the conveying path X. In some other embodiments, one group of vibrator groups 440 may include 3, 4 or more vibration generators 410, and the multiple vibration generators 410 may be spaced along the conveying path X. In addition, there may be other distribution methods. For example, some of the vibration generators 410 may be spaced along the conveying path X, and the remaining vibration generators 410 may be located at the same side end or both ends of the vacancy between the vibration generators 410 spaced along the conveying path X, so as to evenly distribute the vibration generators 410 on the side of the vibration main body 420 facing away from the current collector 500, making the slurry receive more uniform vibration and further improving the consistency of the weight of the pole piece.

[0058] In the vibrator group 440, different vibration generators 410 can generate different vibrations. Exemplarily, the vibrator group 440 may include two vibration generators 410. The vibration directions of the two vibration generators 410 are opposite, and the vibration frequencies and vibration amplitudes of the two vibration generators 410 are the same. Thus, the vibration main body 420 can generate and apply a vibration with a constant frequency but a larger amplitude to the second surface 520, which is beneficial to the leveling of the slurry. Another exemplarily, the vibration directions of the two vibration generators 410 in the vibrator group 440 are opposite, and the vibration frequencies are the same, but the amplitudes of the two vibration generators 410 are different. Thus, the vibration main body 420 can generate and apply a varying vibration to the second surface 520, which is beneficial to the leveling of the slurry. Still another exemplarily, the vibration directions of the two vibration generators 410 in the vibrator group 440 are different, the vibration amplitudes are the same, but the vibration frequencies are different. Thus, the vibration main body 420 can generate and apply a vibration with varying vibration amplitude and vibration frequency to the second surface 520, which is beneficial to the leveling of the slurry. Of course, the number of vibrator groups 440 in a vibrator group 440 can be more, and the vibration mode of the vibrator group 440 can be one of the above vibration modes. By adjusting parameters such as the vibration direction, vibration frequency, and vibration amplitude of the vibration generator 410 in the vibrator group 440, the vibration indirectly applied to the slurry by the vibration main body 420 can be flexibly changed, thereby improving the leveling efficiency of the slurry.

[0059] In some embodiments, the number of vibrator groups 440 is at least two, and at least two vibrator groups 440 are spaced apart in the transverse direction Y, where the transverse direction Y is parallel to the second surface 520 and intersects the conveying path X. The number of vibrator groups 440 can be at least two, and at least two vibrator groups 440 are spaced apart in the transverse direction Y, so that multiple vibration generators 410 are all connected to the side of the vibration main body 420 facing away from the current collector 500, and the transverse direction Y intersects the conveying path X, such that the unit area of the second surface 520 in the transverse direction Y receives vibrations indirectly transmitted by multiple vibrator groups 440. Thus, the number of vibrator groups 440 is at least two, and different groups of vibrator groups 440 are spaced apart in the transverse direction Y, which can stably support the vibration main body 420 through multiple vibrator groups 440, and multiple vibration generators 410 are spaced apart in both the conveying direction and the transverse direction Y, so that the intensity of the vibration received by the slurry located on the first surface 510 is more uniform, which is more conducive to the leveling treatment of the slurry. While improving the leveling efficiency, it can further improve the consistency of the weight of the pole piece after drying. In this embodiment, the number of vibrator groups 440 is two, and the number of vibration generators 410 in each vibrator group 440 is two. Among different vibrator groups 440, the vibration generators 410 located upstream on the conveying path X all emit the same vibration, and the vibration generators 410 located downstream all emit the same vibration, but the vibrations emitted by the vibration generators 410 located upstream and downstream are different, that is, the vibration modes of each vibrator group 440 are the same. In this way, it is convenient to control the vibration mode of the vibration main body 420 driven by the vibration generators 410, which is beneficial to the leveling of the slurry. Of course, the number of vibration generators 410 in the vibrator group 440 and the number of vibrator groups 440 can be more, and different vibrator groups 440 can be evenly spaced apart in the transverse direction Y, thereby making the vibrations received by the second surface 520 more uniform, which is beneficial to improving the consistency of the weight of the pole piece.

[0060] See Figure 5 , Figure 5 is a schematic structural diagram of a pole piece production system according to one or more embodiments.

[0061] The electrode sheet production system 20 includes an unwinding roller, a winding roller, and the electrode sheet production equipment 10. The unwinding roller and the winding roller can be respectively located upstream and downstream of the electrode sheet production equipment 10 on the conveying path X. The current collector 500 is wound on a reel, and the reel can be sleeved on the unwinding roller. The unwinding roller rotates to release the current collector 500 on the reel. The current collector 500 passes through the electrode sheet production equipment 10 to coat the slurry on the surface of the current collector 500 and perform a drying process. The dried current collector 500 is conveyed to the winding roller. One end of the current collector 500 away from the unwinding roller is connected to the reel sleeved on the winding roller. The winding roller rotates to wind the dried current collector 500, and finally the battery electrode sheet is obtained. Exemplarily, the unwinding roller can be located upstream of the back roller 110 of the electrode sheet production equipment on the conveying path X, and the winding roller can be located downstream of the drying device 300 on the conveying path X.

[0062] In summary, the coating device 200 is used to coat the slurry on the first surface 510 of the current collector 500. The vibrating device 400 is located between the coating device 200 and the drying station 310 on the transmission path. The vibrating device 400 includes a vibrating main body 420 and at least two vibration generators 410 connected to the vibrating main body 420. Multiple vibration generators 410 can simultaneously apply vibrations to the vibrating main body 420. Furthermore, the vibration effect of the vibrating main body 420 can be controlled by adjusting parameters such as the vibration direction, vibration amplitude, and vibration frequency of each vibration generator 410. The vibrating main body 420 then applies the vibration synthesized by the multiple vibration generators 410 to the slurry through the second surface 520, improving the uniformity and efficiency of the slurry leveling. The leveled slurry is then dried by the drying device 300, and thus the consistency of the weight of the dried electrode sheet can be improved.

[0063] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some 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 all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features 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 pole piece production equipment, characterized in that: The pole piece production equipment comprises: A conveying device, used for conveying the current collector along a conveying path; a coating device, located on the conveying path, for coating the slurry onto the first surface of the current collector; A drying device, located downstream of the coating device on the conveying path, the drying device having a drying station, the drying station being used to dry the slurry on the first surface; A vibration device is located between the coating device and the drying station on the conveying path, the vibration device includes a vibration main body and at least two vibration generators, at least two of the vibration generators are connected to the vibration main body, at least two of the vibration generators jointly apply vibration to the vibration main body so that the vibration main body applies vibration to the second surface of the collector, wherein the first surface and the second surface are arranged opposite to each other.

2. The pole piece production equipment according to claim 1, characterized in that: At least two of the vibration generators are divided into at least one vibrator group, and at least two of the vibration generators of the vibrator group are arranged at intervals along the conveying path.

3. The pole piece production equipment according to claim 2, characterized in that: The number of the vibrator groups is at least two, and the at least two vibrator groups are arranged at intervals in a transverse direction, wherein the transverse direction is parallel to the second surface and intersects the conveying path.

4. The pole piece production equipment according to claim 1, characterized in that: Each of the vibration generators drives the vibration body to apply vibration perpendicular to the second surface to the second surface.

5. The pole piece production equipment according to claim 1, characterized in that: The vibration device also includes a mounting base, and the plurality of vibration generators are fixed on the mounting base.

6. The pole piece production equipment according to claim 1, characterized in that: The vibration body portion includes a contact arc surface, and the contact arc surface is convex toward the second surface.

7. The pole piece production equipment according to claim 6, characterized in that: A dimension of the contact arc surface in a transverse direction is greater than a dimension of the second surface in the transverse direction, wherein the transverse direction is parallel to the second surface and intersects the conveying path.

8. The pole piece production equipment according to any one of claims 1 to 7, characterized in that: The drying device comprises a coating oven; The drying station and the vibration device are located in the coating oven; Alternatively, the drying station is located inside the coating oven, and the vibration device is located outside the coating oven.

9. The pole piece production equipment according to any one of claims 1 to 7, characterized in that: The conveying device includes a back roller and multiple passing rollers, the back roller and the multiple passing rollers are arranged in sequence along the conveying path, the back roller and the coating device are arranged opposite to each other, the vibration device is arranged between the back roller and the passing roller, or the vibration device is arranged between two passing rollers.

10. A pole piece production system, characterized in that: The pole piece production system comprises the pole piece production equipment as described in any one of claims 1 to 9.

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