A pole piece coating device

Abstract

The present application discloses a pole piece coating device. The pole piece coating device provided by the present application includes a conveying device and a wetting device. The conveying device is used to convey a current collector along a conveying path. The wetting device is located on the conveying path and includes a slurry tank, a wetting member, and a scraping member. The slurry tank is used to store slurry. The wetting member is used to hold the current collector against the slurry in the slurry tank to wet the slurry in the slurry tank. The scraping member is used to scrape a part of the slurry on the current collector during the conveyance of the current collector. Thus, during the process of the conveying device conveying the current collector along the conveying path, the wetting member holds the current collector against the slurry in the slurry tank so that the current collector wets the slurry, thereby facilitating the full coating of the slurry on the current collector, and then forming a film layer, improving the coating efficiency. The scraping member further scrapes a part of the slurry on the current collector, making the coated slurry more uniform after scraping, facilitating the control of the coating thickness of the slurry, and improving the coating effect.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a pole piece coating device. 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 development of battery technology hinges on 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] A battery device includes one or more battery cells. Inside the battery cell, one or more electrode assemblies are provided. The electrode assembly can be formed by winding or stacking pole pieces. The pole piece includes a current collector and an active material layer coated on the current collector. However, how to coat the active material layer on the current collector has become a technical problem that urgently needs to be solved. Summary of the Invention

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

[0005] To solve the above problems, this application provides a pole piece coating device. The pole piece coating device includes a conveying device and a wetting device. The conveying device is used to convey the current collector along a conveying path. The wetting device is located on the conveying path. The wetting device includes a slurry tank, a wetting member, and a scraping member. The slurry tank is used to store slurry. The wetting member is used to press the current collector into the slurry tank to wet the slurry in the slurry tank. The scraping member is used to scrape a part of the slurry on the current collector during the conveyance of the current collector. Thus, during the process of the conveying device conveying the current collector along the conveying path, the wetting member presses the current collector into the slurry tank to wet the current collector with the slurry, so as to facilitate the full coating of the slurry on the current collector, and then form a film layer, improving the coating efficiency. The scraping member further scrapes a part of the slurry on the current collector, making the coated slurry more uniform after scraping, facilitating the control of the coating thickness of the slurry, and improving the coating effect.

[0006] In some embodiments, the wetting member includes a first wetting roller, and the scraping member includes a first scraping blade and a second scraping blade. A first position of the first wetting roller is configured to abut against the current collector into the slurry tank to wet the slurry in the slurry tank. The first scraping blade is configured to contact a first surface of the current collector, and the second scraping blade is configured to contact a second surface of the current collector. Wherein, the first surface and the second surface are arranged opposite to each other in the direction of gravity. A second position where the first scraping blade contacts the current collector and a third position where the second scraping blade contacts the current collector are both downstream of the first wetting roller in the conveying path. Thereby, the first position of the first wetting roller can abut against the current collector to wet the current collector with the slurry, and the first scraping blade and the second scraping blade downstream can respectively scrape and coat the first surface and the second surface, so that the slurry coating on the first surface and the second surface is more uniform, facilitating the control of the slurry coating thickness on the first surface and the second surface, and facilitating the natural falling of the partially scraped slurry under the action of gravity, improving the coating effect.

[0007] In some embodiments, the first surface is upstream of the second surface in the direction of gravity, and the second position is downstream of the third position in the conveying path, so that a part of the slurry on the second surface can enter the first surface through the through hole of the current collector under the scraping action of the second scraping blade and be scraped by the first scraping blade. Thereby, at the third position, the second scraping blade first scrapes the second surface and scrapes a part of the slurry into the through hole of the current collector to enter the first surface through the through hole, so as to facilitate the filling of the through hole with the slurry and help to discharge the air bubbles in the through hole. At the same time, the first scraping blade scrapes the slurry coated on the first surface at the second position and the part of the slurry entering the first surface under the action of the second scraping blade, further making the slurry coating on the first surface more sufficient and uniform.

[0008] In some embodiments, the wetting member includes a second wetting roller. The second wetting roller is downstream of the first wetting roller in the conveying path. The first surface of the current collector abuts against a fourth position of the second wetting roller to wet the slurry in the slurry tank with the current collector. Thereby, the first surface of the current collector can be abutted against the fourth position of the second wetting roller to wet the current collector with the slurry in the slurry tank again, so as to facilitate the more sufficient coating of the slurry on the current collector, and then form a film layer, improving the coating efficiency.

[0009] In some embodiments, the scraping member includes a third scraping blade. The second surface of the current collector contacts a fifth position of the third scraping blade. Wherein, the fourth position and the fifth position at least partially overlap in the direction of gravity. Thereby, through the cooperation of the third scraping blade and the second wetting roller, the first surface and the second surface of the current collector are scraped and coated, facilitating better control of the slurry thickness on the first surface and the first surface, and making the slurry coating more uniform.

[0010] In some embodiments, the scraping member includes a scraping extrusion roller. The first surface of the current collector contacts the sixth position of the second wetting roller, and the position where the scraping extrusion roller contacts the second surface corresponds to the sixth position, where the sixth position is downstream of the fourth position on the conveying path. Thus, the second wetting roller and the scraping extrusion roller cooperate to extrude the first surface and the second surface of the current collector at the sixth position, so as to better control the coating thickness of the slurry on the current collector and further improve the coating uniformity of the slurry.

[0011] In some embodiments, the first wetting roller and / or the second wetting roller can move in the direction of gravity. Thus, it is convenient to adjust the positions of the first wetting roller and the second wetting roller in the direction of gravity according to the change of the slurry liquid level in the slurry tank, so that the first wetting roller and the second wetting roller can hold the current collector against the slurry in the slurry tank, improving the flexibility of the pole piece coating equipment and alleviating the risk of insufficient wetting caused by the slurry liquid level in the slurry tank being lower than the position where the current collector is held by the first wetting roller and the second wetting roller.

[0012] In some embodiments, the wetting device includes a first guide roller, and the first guide roller is located between the first wetting roller and the second wetting roller on the conveying path. Both the fourth position and the first position are downstream of the contact position between the first guide roller and the current collector in the direction of gravity. Thus, the first guide roller can guide and support the current collector between the first wetting roller and the second wetting roller, reducing the risk of the current collector shaking and deforming. At the same time, both the fourth position and the first position are downstream of the contact position between the first guide roller and the current collector in the direction of gravity, facilitating the flow of the slurry on the current collector to the first position and the fourth position under the action of gravity, and alleviating the risk of the slurry accumulating at the first guide roller under the action of gravity, resulting in uneven thickness.

[0013] In some embodiments, the wetting device includes a first vibrator, and the first vibrator is arranged in the slurry tank. Thus, the first vibrator can generate vibration in the slurry tank, which helps to discharge the bubbles in the slurry, reducing the risk of bubbles appearing in the slurry coated on the current collector, and at the same time facilitating further and more sufficient wetting of the current collector.

[0014] In some embodiments, the pole piece coating equipment includes a second guide roller, and the second guide roller is upstream of the wetting member in the direction of gravity, so that part of the current collector is transmitted from the wetting member to the second guide roller along the direction of gravity. Thus, during the process of the current collector being transmitted from the wetting member to the second guide roller, part of the slurry on the current collector naturally falls under the action of gravity to separate from the current collector, which helps to reduce the excess slurry on the current collector, improve the coating uniformity of the slurry, and at the same time has a simple structure, makes full use of gravity, and saves costs.

[0015] In some embodiments, the electrode sheet coating device includes a blowing member. The blowing member is located between the second over-roller and the wetting member in the direction of gravity. The blowing member is configured to blow air towards the current collector in the direction of gravity. Thus, the blowing member can blow air towards the current collector in the direction of gravity, so as to cooperate with gravity to blow off the excess slurry on the current collector, and further improve the coating uniformity of the slurry.

[0016] In some embodiments, the electrode sheet coating device includes a drying device. The drying device is located downstream of the wetting device on the conveying path. The drying device is configured to dry the slurry on the current collector. Thus, the drying device can dry the slurry on the current collector, so as to facilitate the curing of the slurry to form a film layer.

[0017] In some embodiments, the electrode sheet coating device includes a heating device. The heating device is disposed adjacent to the drying device. The heating device is configured to perform a heating treatment on the slurry on the current collector. Thus, the heating device can cooperate with the drying device to fully dry the slurry, and alleviate the risk of insufficient curing caused by insufficient drying temperature of the slurry.

[0018] In some embodiments, the heating device includes a first heating member. The first heating member is located upstream or downstream of the drying device on the conveying path. Thus, the first heating member can cooperate with the drying device to fully dry the slurry, alleviate the risk of insufficient curing caused by insufficient drying temperature of the slurry, and at the same time, the length of the drying device on the conveying path can be reduced, saving costs.

[0019] In some embodiments, the heating device includes a second heating member. The drying device is located between the first heating member and the second heating member on the conveying path. Thus, one of the first heating member and the second heating member can pre-heat the slurry on the current collector, so that the drying device can better dry the slurry, and the other can further heat the slurry after the drying treatment, so that the slurry can better adhere to the current collector.

[0020] In some embodiments, the electrode sheet coating device includes a cleaning device. The cleaning device is located upstream of the wetting device on the conveying path. The cleaning device includes a cleaning member and a cleaning tank. The cleaning member is configured to hold the current collector against the cleaning tank to immerse the cleaning liquid in the cleaning tank. Thus, the cleaning member can hold the current collector, so that the current collector is fully immersed in the cleaning liquid, so that the current collector is fully cleaned and then conveyed to the wetting device, improving the adhesion effect of the slurry on the current collector, and alleviating the risk that the impurities on the surface of the current collector cause the slurry to be difficult to adhere.

[0021] In some embodiments, the cleaning device includes a liquid scraping member. The liquid scraping member is located downstream of the cleaning member on the conveying path. The liquid scraping member is configured to scrape off a part of the cleaning liquid on the current collector during the conveying of the current collector. Thus, the liquid scraping member can scrape off a part of the cleaning liquid on the current collector, alleviating the risk that the excessive residual cleaning liquid on the current collector causes the subsequent slurry wetting effect to decline.

[0022] In some embodiments, the cleaning device includes a second vibrator disposed in the cleaning tank. Thus, vibrations can be generated in the cleaning tank by the second vibrator, so that the current collector is cleaned more thoroughly.

[0023] In some embodiments, the electrode sheet coating equipment includes a tape sticking device. The tape sticking device includes a tape releasing roller, a tape winding roller, and a tape. The wetting device is located between the tape releasing roller and the tape winding roller on the conveying path. The tape is stuck on a predetermined area on one side surface of the current collector between the tape releasing roller and the tape winding roller. The tape is wound around the tape releasing roller and the tape winding roller. The tape releasing roller and the tape winding roller rotate during the conveying of the current collector. Thus, the tape can be stuck on a predetermined area on one side surface of the current collector by the tape releasing roller, so that the predetermined area is isolated from the slurry by the tape, making it difficult for the slurry to adhere to the predetermined area of the current collector. After the wetting device processes the current collector, the tape is collected by the tape winding roller, which helps to expose the predetermined area of the current collector for subsequent processing. At the same time, the structure is simple and the degree of automation is relatively high.

[0024] In some embodiments, the number of tape sticking devices is two groups, and the tapes of the two groups of tape sticking devices are respectively stuck on the predetermined areas on both side surfaces of the current collector between the tape releasing roller and the tape winding roller. Thus, it is convenient to expose the predetermined areas on both side surfaces of the current collector for subsequent processing.

[0025] In some embodiments, the conveying device includes an unwinding assembly and a winding assembly for forming a conveying path. The unwinding assembly unwinds the current collector, and the winding assembly winds the current collector. Thus, a conveying path can be formed by the unwinding assembly and the winding assembly to convey the current collector, reducing the jitter and deformation of the current collector, improving the conveying efficiency and stability of the current collector, and increasing the degree of automation of the electrode sheet coating equipment.

[0026] In some embodiments, the conveying device further includes a deviation rectifying assembly located between the unwinding assembly and the winding assembly on the conveying path. The deviation rectifying assembly is used to detect the position of the current collector. Thus, the position of the current collector can be detected by the deviation rectifying assembly, reducing the risk of the current collector shifting during transmission, and improving the conveying stability and reliability of the current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 for use 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.

[0028] Figure 1 is a first structural schematic diagram of an electrode sheet coating equipment according to one or more embodiments of the present application;

[0029] Figure 2 is a schematic structural view of a current collector according to one or more embodiments of the present application;

[0030] Figure 3 is a second schematic structural view of a pole piece coating device according to one or more embodiments of the present application;

[0031] Figure 4 is a third schematic structural view of a pole piece coating device according to one or more embodiments of the present application;

[0032] Figure 5 is a schematic structural view of a drying device and a heating device of a pole piece coating device according to one or more embodiments of the present application;

[0033] Figure 6 is a fourth schematic structural view of a pole piece coating device according to one or more embodiments of the present application;

[0034] Figure 7 is a schematic structural view of a cleaning device of a pole piece coating device according to one or more embodiments of the present application;

[0035] Figure 8 is a schematic structural view of a glue releasing roller of a pole piece coating device according to one or more embodiments of the present application;

[0036] Figure 9 is a fifth schematic structural view of a pole piece coating device according to one or more embodiments of the present application;

[0037] Figure 10 is a sixth schematic structural view of a pole piece coating device according to one or more embodiments of the present application.

[0038] Reference numerals in the drawings: pole piece coating device 1; current collector 2; first surface 100; second surface 200; through hole 300; conveying device 10; conveying path 11; unwinding assembly 12; winding assembly 13; deviation rectifying assembly 14; infiltration device 20; slurry tank 21; infiltration member 22; first infiltration roller 221; second infiltration roller 222; scraping member 23; first scraping blade 231; second scraping blade 232; third scraping blade 233; scraping and pressing roller 234; first idler roller 24; first vibrator 25; second idler roller 30; air blowing member 40; drying device 50; heating device 60; first heating member 61; second heating member 62; cleaning device 70; cleaning member 71; cleaning tank 72; liquid scraping member 73; second vibrator 74; glue sticking device 80; glue releasing roller 81; glue receiving roller 82; glue sticking 83; first position p1; second position p2; third position p3; fourth position p4; fifth position p5; sixth position p6; gravity direction x1. Detailed embodiments

[0039] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying 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.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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 description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this 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 this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0042] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, 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.

[0043] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0044] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0045] 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.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, 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 it 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.

[0047] 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 hydraulic, 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 military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0048] During the manufacturing process of batteries, it is necessary to coat a film layer on the current collector. Currently, the method of coating the film layer on the current collector is single, and the coating effect is poor.

[0049] To solve the technical problems existing in the related art, a pole piece coating device is provided. Among them, the pole piece coating device can transport the current collector through a conveying device, hold the current collector against the slurry tank through a wetting member in the wetting device to wet the slurry, and scrape a part of the slurry on the current collector through a scraping member, thereby forming a film layer, which improves the efficiency of coating the film layer on the current collector, and at the same time makes the thickness of the film layer more uniform, improving the coating effect.

[0050] A battery device generally may include a box body and battery cells, and the battery cells are accommodated in the box body. In a battery, 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. A combined series-parallel connection means that among the multiple battery cells, there are both series and parallel connections. 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 also include other structures. For example, the battery may further include a busbar component for realizing the electrical connection between the multiple battery cells.

[0051] The manufacturing methods of battery cells include the stacking type and the winding type, that is, battery cells are divided into two types: stacked batteries and wound batteries. Stacked batteries have a uniform current collection effect, a relatively small internal resistance of the battery, and a large specific power, but in order to improve the 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 making the electrode plates and assembling 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.

[0052] A battery cell refers to the smallest unit that makes up a battery device. A battery cell may include a housing, an electrode assembly, and other functional components. The electrode assembly is the component in the battery cell where an electrochemical reaction occurs. The housing may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and generally an isolation member is provided between the positive electrode plate and the negative electrode plate.

[0053] The electrode plate may be a positive electrode plate or a negative electrode plate. The part of the electrode plate with the active material constitutes the main part of the electrode assembly, and the parts of the electrode plate without the active material respectively constitute the electrode tabs. During the charge and discharge process of the battery, the active material reacts with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop. The electrode plate may include a current collector and an active material provided on at least one surface of the current collector. The active material may be coated on the current collector in the form of a slurry to form a film layer on the current collector, and then the film layer may be fixed on the current collector by means such as baking and rolling. Among them, the material of the slurry may include, but is not limited to, lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds, artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0054] The main purpose of this application is to provide a pole piece coating device, aiming to solve the above-mentioned technical problems existing in the prior art.

[0055] Please refer to Figure 1 , Figure 1It is a first structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application.

[0056] The pole piece coating device 1 includes a conveying device 10 and a wetting device 20. The conveying device 10 is used to convey the current collector 2 along the conveying path 11. The wetting device 20 is located on the conveying path 11. The wetting device 20 includes a slurry tank 21, a wetting member 22, and a scraping member 23. The slurry tank 21 is used to store the slurry. The wetting member 22 is used to hold the current collector 2 into the slurry tank 21 to wet the slurry in the slurry tank 21. The scraping member 23 is used to scrape a part of the slurry on the current collector 2 during the conveyance of the current collector 2.

[0057] The current collector 2 may include, but is not limited to, a metal foil or a composite current collector 2. 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. may be used. The composite current collector 2 may include a polymer material base layer and a metal layer. The composite current collector 2 may 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.).

[0058] The conveying device 10 can carry the current collector 2 and convey the current collector 2 along the conveying path 11. Exemplarily, the conveying device 10 may include a driving member and a carrying member. The driving member may include, but is not limited to, a motor, etc. The carrying member may include, but is not limited to, a conveying roller, etc. The wetting device 20 is arranged on the conveying path 11 formed by the conveying device 10 so that the current collector 2 passes through the wetting device 20 during conveyance. The slurry tank 21 stores the slurry. As an example, the slurry material may 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 also be used as battery cathode active materials may also be used. These cathode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may 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 may 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. The slurry tank 21 may be provided with an inlet and outlet for supplementing or discharging the slurry.

[0059] The wetting member 22 can press the current collector 2 against the slurry tank 21. It can be understood that the wetting member 22 presses the current collector 2 into the slurry in the slurry tank 21 so that the slurry fully wets the current collector 2. The slurry can adhere to the current collector 2 and be conveyed along the conveying path 11 with the current collector 2. After the slurry dries and solidifies, a film layer can be formed on the current collector 2. The scraping member 23 can scrape the current collector 2 during the conveyance of the current collector 2, thereby scraping off a part of the slurry on the current collector 2. Exemplarily, the scraping member 23 can maintain a certain distance from the current collector 2. When the thickness of the slurry adhering to the current collector 2 is greater than the distance between the scraping member 23 and the current collector 2, the scraping member 23 can scrape off the excess slurry from the current collector 2 and make the remaining slurry that does not exceed the thickness more flat and uniform. It can be understood that the distance between the scraping member 23 and the current collector 2 can be adjusted according to the actual film layer thickness requirement on the current collector 2.

[0060] Through the above-described embodiments, during the process of the conveying device 10 conveying the current collector 2 along the conveying path 11, the wetting member 22 presses the current collector 2 into the slurry tank 21 so that the current collector 2 wets the slurry, thereby facilitating the full coating of the slurry on the current collector 2, and then forming a film layer, improving the coating efficiency. The scraping member 23 further scrapes a part of the slurry on the current collector 2, making the coated slurry more uniform after scraping, facilitating the control of the coating thickness of the slurry, and improving the coating effect.

[0061] In some embodiments, the wetting member 22 includes a first wetting roller 221, and the scraping member 23 includes a first scraping blade 231 and a second scraping blade 232. A first position p1 of the first wetting roller 221 is used to abut the current collector 2 into the slurry tank 21 to wet the slurry in the slurry tank 21. The first scraping blade 231 is used to contact a first surface 100 of the current collector 2, and the second scraping blade 232 is used to contact a second surface 200 of the current collector 2. Wherein, the first surface 100 and the second surface 200 are arranged opposite to each other in the gravity direction x1. A second position p2 where the first scraping blade 231 contacts the current collector 2 and a third position p3 where the second scraping blade 232 contacts the current collector 2 are both downstream of the first wetting roller 221 on the conveying path 11. The first wetting roller 221 abuts the current collector 2 into the slurry in the slurry tank 21 to fully wet the current collector 2 with the slurry. The second position p2 and the third position p3 are both downstream of the first wetting roller 221 on the conveying path 11. Exemplarily, at the first position p1, the current collector 2 can be immersed in the slurry. After the current collector 2 is wetted with the slurry, it continues to be conveyed along the conveying path 11 to the second position p2 and the third position p3. At the second position p2 and the third position p3, the current collector 2 can be in a separated state from the slurry in the slurry tank 21 and contact the first scraping blade 231 and the second scraping blade 232 respectively. The first scraping blade 231 can scrape a part of the slurry on the first surface 100, and the second scraping blade 232 can scrape a part of the slurry on the second surface 200. It should be noted that the contact between the first scraping blade 231 and the first surface 100 of the current collector 2 can mean that the first scraping blade 231 directly contacts the first surface 100, or it can mean that the first scraping blade 231 indirectly contacts the first surface 100 through the slurry on the first surface 100. The same applies to the contact between the second scraping blade 232 and the second surface 200 of the current collector 2. Exemplarily, the first scraping blade 231 and the first surface 100 of the current collector 2 can maintain a first distance. At the first position p1, the thickness of the slurry on the first surface 100 of the current collector 2 is greater than the first distance. The first scraping blade 231 can indirectly contact the first surface 100 through the slurry, block and scrape off the thickness part of the slurry greater than the first distance, so that the thickness of the slurry on the first surface 100 of the current collector 2 after passing through the first position p1 is less than or equal to the first distance. At the same time, the slurry remaining on the first surface 100 can be squeezed to a certain extent, so that the slurry adheres better to the first surface 100, thereby improving the uniformity and flatness of the slurry on the first surface 100, and facilitating the control of the thickness of the slurry remaining on the first surface 100. Wherein, the first distance can be adjusted according to actual needs.

[0062] It should be noted that the first surface 100 and the second surface 200 are arranged in opposite directions in the gravity direction x1. It is not limited that the first surface 100 and the second surface 200 are arranged in opposite directions in the gravity direction x1 throughout the entire conveying path 11. Instead, it is to illustrate the relative position relationship between the first surface 100 and the second surface 200 at at least some positions on the conveying path 11. The first surface 100 and the second surface 200 are arranged in opposite directions in the gravity direction x1, which is convenient for better conveying the current collector 2 and is also easy to set the positions of the first scraping blade 231 and the second scraping blade 232, with a simple structure. In some application scenarios, the second position p2 and the third position p3 can be correspondingly arranged in the gravity direction x1 with the slurry tank 21, so that the part of the slurry scraped off by the first scraping blade 231 and the second scraping blade 232 naturally falls back into the slurry tank 21 under the action of gravity, improving the scraping efficiency. Thus, the first position p1 of the first wetting roller 221 can be abutted against the current collector 2 to wet the current collector 2 with the slurry, and the first scraping blade 231 and the second scraping blade 232 downstream can respectively scrape and coat the first surface 100 and the second surface 200, making the slurry coating on the first surface 100 and the second surface 200 more uniform, facilitating the control of the slurry coating thickness on the first surface 100 and the second surface 200, and facilitating the natural falling of the scraped part of the slurry under the action of gravity, improving the coating effect.

[0063] Combined Figure 1 - Figure 2 , Figure 2 is a schematic structural diagram of a current collector according to one or more embodiments of the present application.

[0064] In some embodiments, the first surface 100 is upstream of the second surface 200 in the gravity direction x1, and the second position p2 is downstream of the third position p3 on the conveying path 11, so that a part of the slurry on the second surface 200 can enter the first surface 100 through the through holes 300 of the current collector 2 under the scraping action of the second scraping blade 232 and be scraped by the first scraping blade 231. It should be noted that a plurality of through holes 300 communicating the first surface 100 and the second surface 200 can be formed on the current collector 2. During the process of the current collector 2 soaking the slurry, the slurry can be filled in the through holes 300 and connected with the slurry on the first surface 100 and the second surface 200. In practical applications, there may be some air bubbles inside the slurry, and there is a risk that the air bubbles are difficult to discharge and remain in the through holes 300. In some application scenarios, the plurality of through holes 300 can be arranged in an array on the current collector 2. The second position p2 is downstream of the third position p3 on the conveying path 11. It can be understood that at the third position p3, the second scraping blade 232 scrapes the slurry on the second surface 200. The second scraping blade 232 can exert a certain squeezing effect on the slurry on the second surface 200, so as to press a part of the slurry into the through holes 300, and then enter the first surface 100 through the through holes 300. Then the current collector 2 reaches the second position p2 through the third position p3, and the first scraping blade 231 can scrape and squeeze the slurry originally attached to the first surface 100 and the slurry entering the first surface 100 through the through holes 300 at the same time. It should be noted that scraping the second surface 200 first, compared with scraping the first surface 100 first, reduces the amount of slurry that falls off the current collector 2 under the action of gravity on the second surface 200 before scraping the second surface 200, so that the slurry on the second surface 200 is more sufficient when the second scraping blade 232 scrapes the second surface 200, and more slurry can enter the first surface 100 through the through holes 300, thereby effectively reducing the air bubbles in the slurry in the through holes 300, facilitating the filling of the slurry in the through holes 300, and at the same time increasing the amount of slurry when the first scraping blade 231 scrapes the first surface 100 at the second position p2, facilitating the more sufficient coating of the slurry on the first surface 100. Therefore, at the third position p3, the second scraping blade 232 first scrapes the second surface 200 and scrapes a part of the slurry into the through holes 300 of the current collector 2 to enter the first surface 100 through the through holes 300, so as to facilitate the filling of the slurry in the through holes 300 and help to discharge the air bubbles in the through holes 300. At the same time, the first scraping blade 231 scrapes the slurry coated on the first surface 100 at the second position p2 and the part of the slurry entering the first surface 100 under the action of the second scraping blade 232, further making the coating of the slurry on the first surface 100 more sufficient and uniform.

[0065] In some embodiments, the wetting member 22 includes a second wetting roller 222. The second wetting roller 222 is located downstream of the first wetting roller 221 on the conveying path 11. The first surface 100 of the current collector 2 abuts against the fourth position p4 of the second wetting roller 222, so that the current collector 2 wets the slurry in the slurry tank 21. The second wetting roller 222 abuts against the first surface 100 of the current collector 2 and wets the current collector 2 again into the slurry in the slurry tank 21, increasing the number of times and the time for the current collector 2 to wet the slurry, and improving the wetting effect of the current collector 2. Thus, by abutting the fourth position p4 of the second wetting roller 222 against the first surface 100 of the current collector 2, the current collector 2 can be wetted again in the slurry in the slurry tank 21, facilitating the slurry to be more fully coated on the current collector 2, and then forming a film layer, thereby improving the coating efficiency.

[0066] In some embodiments, the scraping member 23 includes a third scraping blade 233. The second surface 200 of the current collector 2 contacts the fifth position p5 of the third scraping blade 233. Among them, the fourth position p4 and the fifth position p5 at least partially overlap in the gravity direction x1. It can be understood that the second wetting roller 222 and the third scraping blade 233 can scrape the slurry on the first surface 100 and the second surface 200 respectively, and the fourth position p4 and the fifth position p5 at least partially overlap in the gravity direction x1. Specifically, the second wetting roller 222 and the third scraping blade 233 cooperate with each other at least at the overlapping part of the fourth position p4 and the fifth position p5 in the gravity direction x1, and squeeze and scrape the first surface 100 and the second surface 200 respectively from the gravity direction x1 and the opposite direction of the gravity direction x1, thereby improving the scraping effect, better scraping off the excess slurry, and improving the coating uniformity and adhesion effect of the remaining slurry. Thus, by the third scraping blade 233 cooperating with the second wetting roller 222 to scrape the first surface 100 and the second surface 200 of the current collector 2, it is convenient to better control the thickness of the slurry on the first surface 100 and the first surface 100, making the slurry coating more uniform.

[0067] In some embodiments, the first wetting roller 221 and / or the second wetting roller 222 can move in the gravity direction x1. It can be understood that during the process of wetting the slurry, the liquid level of the slurry in the slurry tank 21 will change. Exemplarily, in a state where no slurry is replenished into the slurry tank 21, the slurry in the slurry tank 21 will gradually decrease, so that the liquid level of the slurry in the slurry tank 21 continuously drops. The first wetting roller 221 and / or the second wetting roller 222 can move in the gravity direction x1, so that the first wetting roller 221 and the second wetting roller 222 can flexibly adjust their positions, thereby matching the liquid level of the slurry in the slurry tank 21. Furthermore, it is convenient for the first wetting roller 221 and the second wetting roller 222 to better hold the current collector 2 below the liquid level of the slurry, improving the wetting effect. Thus, it is convenient to adjust the positions of the first wetting roller 221 and the second wetting roller 222 in the gravity direction x1 according to the change of the liquid level of the slurry in the slurry tank 21, so that the first wetting roller 221 and the second wetting roller 222 can hold the current collector 2 in the slurry in the slurry tank 21, improving the flexibility of the electrode coating apparatus 1 and alleviating the risk that the liquid level of the slurry in the slurry tank 21 is lower than the position where the current collector 2 is held by the first wetting roller 221 and the second wetting roller 222, resulting in insufficient wetting.

[0068] In some embodiments, the wetting device 20 includes a first idler roll 24. The first idler roll 24 is located between the first wetting roll 221 and the second wetting roll 222 on the conveying path 11. Both the fourth position p4 and the first position p1 are located downstream of the contact position between the first idler roll 24 and the current collector 2 in the gravity direction x1. The first idler roll 24 can provide support for the current collector 2 and guide the current collector 2 to move along the conveying path 11. It can be understood that if the fourth position p4 and the first position p1 are located upstream of the contact position between the first idler roll 24 and the current collector 2 in the gravity direction x1, then under the action of gravity, the slurry on the current collector 2 will accumulate on the first idler roll 24, resulting in uneven thickness and causing interference between the first idler roll 24 and the slurry in the slurry tank 21. Compared with this method, placing both the fourth position p4 and the first position p1 downstream of the contact position between the first idler roll 24 and the current collector 2 in the gravity direction x1 facilitates the excess slurry between the first position p1 and the first idler roll 24 to flow down to the first wetting roll 221, and facilitates the excess slurry between the first idler roll 24 and the fourth position p4 to flow down to the second wetting roll 222, thereby facilitating the full use of the slurry to wet the current collector 2 and facilitating the excess slurry to flow back into the slurry tank 21. Thus, the first idler roll 24 can guide and support the current collector 2 between the first wetting roll 221 and the second wetting roll 222, reducing the risk of jitter and deformation of the current collector 2. At the same time, both the fourth position p4 and the first position p1 are located downstream of the contact position between the first idler roll 24 and the current collector 2 in the gravity direction x1, facilitating the slurry on the current collector 2 to flow towards the first position p1 and the fourth position p4 under the action of gravity, alleviating the risk of uneven thickness caused by the accumulation of slurry at the first idler roll 24 under the action of gravity.

[0069] In some embodiments, the wetting device 20 includes a first vibrator 25. The first vibrator 25 is disposed in the slurry tank 21. The first vibrator 25 can include, but is not limited to, an ultrasonic vibrator, etc. It can be understood that the first vibrator 25 can generate vibrations in the slurry tank 21, thereby driving the slurry to vibrate. The vibration of the slurry can reduce bubbles and the like that may be mixed in the slurry. Further, the vibration can also facilitate the slurry to wet the current collector 2 more fully. Exemplarily, when the current collector 2 is provided with through holes 300, the vibration of the slurry facilitates the slurry to enter the interior of the through holes 300 more easily. Thus, by generating vibrations in the slurry tank 21 by the first vibrator 25, it helps to discharge the bubbles in the slurry, reducing the risk of bubbles appearing in the slurry coated on the current collector 2, and at the same time facilitating the current collector 2 to be wetted more fully.

[0070] Combined Figure 3 - Figure 4 , Figure 3 is the second structural schematic diagram of the pole piece coating equipment according to one or more embodiments of the present application; Figure 4It is the third structural schematic diagram of the pole piece coating equipment according to one or more embodiments of the present application.

[0071] In some embodiments, the scraping member 23 includes a scraping extrusion roller 234. The first surface 100 of the current collector 2 contacts the sixth position p6 of the second wetting roller 222. The position where the scraping extrusion roller 234 contacts the second surface 200 corresponds to the sixth position p6. Among them, the sixth position p6 is downstream of the fourth position p4 on the conveying path 11. The sixth position p6 being downstream of the fourth position p4 on the conveying path 11 facilitates the scraping extrusion roller 234 to extrude and scrape the excess slurry on the current collector 2 after the second wetting. The scraping extrusion roller 234 can cooperate with the second wetting roller 222 to squeeze the first surface 100 and the second surface 200 of the current collector 2 corresponding to the sixth position p6, so as to further remove the excess slurry on the current collector 2. It can be understood that the distance between the scraping extrusion roller 234 and the second wetting roller 222 can be set according to actual needs, so as to facilitate the control of the coating thickness of the slurry. Thus, the second wetting roller 222 and the scraping extrusion roller 234 cooperate to squeeze the first surface 100 and the second surface 200 of the current collector 2 at the sixth position p6, so as to better control the coating thickness of the slurry on the current collector 2 and further improve the coating uniformity of the slurry.

[0072] In some embodiments, the electrode sheet coating apparatus 1 includes a second deflection roller 30. The second deflection roller 30 is located upstream of the wetting member 22 in the gravity direction x1, so that a part of the current collector 2 is transmitted from the wetting member 22 to the second deflection roller 30 along the gravity direction x1. The second deflection roller 30 can provide support for the current collector 2 and guide the current collector 2 to move along the conveying path 11. It can be understood that during the process of transmitting a part of the current collector 2 from the wetting member 22 to the second deflection roller 30 along the gravity direction x1, the excess slurry on the current collector 2 can naturally fall under the action of the gravity direction x1, so that the gravity can be fully utilized to reduce the excess slurry. In some application scenarios, the transmission path between the wetting member 22 and the second deflection roller 30 corresponds to the slurry tank 21 in the gravity direction x1, so as to facilitate the excess slurry to fall back into the slurry tank 21. It should be noted that the current collector 2 can be parallel to the gravity direction x1 or at a certain angle with the gravity direction x1 during the process of being transmitted from the wetting member 22 to the second deflection roller 30. Exemplarily, the angle between the current collector 2 and the gravity direction x1 during the process of being transmitted from the wetting member 22 to the second deflection roller 30 can be greater than or equal to 0° and less than 90°. Optionally, the current collector 2 is parallel to the gravity direction x1, that is, the thickness direction of the current collector 2 is perpendicular to the gravity direction x1, which facilitates the natural fall of the excess slurry on both opposite surfaces of the current collector 2. Thus, during the process of transmitting the current collector 2 from the wetting member 22 to the second deflection roller 30, a part of the slurry on the current collector 2 naturally falls under the action of gravity to separate from the current collector 2, which helps to reduce the excess slurry on the current collector 2, improve the coating uniformity of the slurry, and at the same time has a simple structure, fully utilizes gravity, and saves costs.

[0073] In some embodiments, the electrode sheet coating apparatus 1 includes a blowing member 40. The blowing member 40 is located between the second deflection roller 30 and the wetting member 22 in the gravity direction x1. The blowing member 40 is used to blow air towards the current collector 2 along the gravity direction x1. The blowing member 40 can blow air towards the current collector 2 along the gravity direction x1. Exemplarily, the blowing member 40 can include but is not limited to an air knife mechanism and the like. The blowing member 40 can control the air pressure change to generate an air flow and blow towards the current collector 2 along the gravity direction x1, so as to cooperate with gravity to drive the excess slurry on the current collector 2 to fall, and at the same time make the slurry remaining on the current collector 2 be coated more evenly. Thus, the blowing member 40 can blow air towards the current collector 2 along the gravity direction x1, so as to cooperate with gravity to blow off the excess slurry on the current collector 2 and further improve the coating uniformity of the slurry.

[0074] In some embodiments, the electrode sheet coating apparatus 1 includes a drying device 50. The drying device 50 is located downstream of the wetting device 20 on the conveying path 11, and the drying device 50 is used to dry the slurry on the current collector 2. The drying device 50 can heat and dry the slurry on the current collector 2. It can be understood that the slurry can be cured to form a stable film layer after heating and drying. In some application scenarios, the drying device 50 may include a heat-insulating box body. The heat-insulating box body has an inlet and an outlet communicating the inside and the outside of the box body. The current collector 2 can enter and exit the heat-insulating box body through the inlet and the outlet. A heating plate is provided inside the heat-insulating box body, and the heating plate can be used to heat the current collector 2. A heat dissipation window and a fan may also be provided on the heat-insulating box body, so as to facilitate improving the temperature stability inside the heat-insulating box body. The fan can be installed on both sides of the heat-insulating box body corresponding to the two surfaces of the current collector 2 facing away from each other, so as to dry the two surfaces of the current collector 2 simultaneously. Further, the drying device 50 may also be provided with a temperature sensor to monitor the temperature condition of the drying device 50. Thus, the slurry on the current collector 2 can be dried by the drying device 50, so as to facilitate the curing of the slurry to form a film layer.

[0075] Combined Figure 5 - Figure 6 , Figure 5 is a schematic structural diagram of the drying device and the heating device of the electrode sheet coating apparatus according to one or more embodiments of the present application; Figure 6 is the fourth schematic structural diagram of the electrode sheet coating apparatus according to one or more embodiments of the present application.

[0076] In some embodiments, the electrode sheet coating apparatus 1 includes a heating device 60. The heating device 60 and the drying device 50 are adjacently arranged. The heating device 60 is used to heat-treat the slurry on the current collector 2. The heating device 60 can heat-treat the slurry. On the conveying path 11, the heating device 60 can be located upstream or downstream of the drying device 50. It should be noted that the adjacent arrangement of the heating device 60 and the drying device 50 may mean that the heating device 60 and the drying device 50 are close to each other on the conveying path 11. For example, no other device is provided between the heating device 60 and the drying device 50. When the heating device 60 is in the upstream state of the drying device 50, the heating device 60 can preheat the slurry on the current collector 2, so that the slurry can better adhere to the current collector 2. Further, the preheating temperature can be lower than the heating temperature of the drying device 50, so as to alleviate the risk of film layer cracking caused by the slurry directly entering the drying device 50 and being heated too quickly. At the same time, the heating device 60 can also reduce the length of the drying device 50, thus saving costs. When the heating device 60 is in the downstream state of the drying device 50, the heating device 60 can further heat the film layer on the current collector 2, so that the film layer can better adhere to the current collector 2. The heating device 60 can include, but is not limited to, a magnetic induction heating system, a laser heating system, and the like. Thus, the heating device 60 can cooperate with the drying device 50 to fully dry the slurry, alleviate the risk of insufficient curing caused by insufficient drying temperature of the slurry, and at the same time can reduce the length of the drying device 50 on the conveying path 11 and save costs.

[0077] In some embodiments, the heating device 60 includes a first heating element 61. The first heating element 61 is located upstream or downstream of the drying device 50 on the conveying path 11. The first heating element 61 can include, but is not limited to, a magnetic induction heating system, a laser heating system, and the like. Exemplarily, the first heating element 61 can be arranged upstream of the drying device 50. Specifically, the first heating element 61 can be a magnetic induction heating system. The magnetic induction heating system can include two magnetic induction heating plates, and the two magnetic induction heating plates can be respectively arranged on the opposite sides of the current collector 2 to preheat the slurry on both sides of the current collector 2. It should be noted that the heating temperature of the first heating element 61 can be set arbitrarily according to actual needs. Thus, the first heating element 61 can cooperate with the drying device 50 to fully dry the slurry, alleviate the risk of insufficient curing caused by insufficient drying temperature of the slurry.

[0078] In some embodiments, the heating device 60 includes a second heating element 62. The drying device 50 is located between the first heating element 61 and the second heating element 62 on the conveying path 11. On the conveying path 11, one of the first heating element 61 and the second heating element 62 is located upstream of the drying device 50, and the other is located downstream of the drying device 50. Exemplarily, the first heating element 61 is located upstream of the drying device 50, and the second heating element 62 is located downstream of the drying device 50. The first heating element 61 can be used to preheat the slurry, and the second heating element 62 can be used to further heat the film layer formed after the drying process, so as to fully cure the film layer and improve the adhesion effect between the film layer and the current collector 2. Optionally, the first heating element 61 is a magnetic induction heating system, and the second heating element 62 is a laser heating system. The laser heating system can include two laser emitters, and the two laser emitters can be respectively arranged on the opposite sides of the current collector 2 to further heat and cure the film layers on both sides of the current collector 2. It should be noted that the heating temperature of the second heating element 62 can be set arbitrarily according to actual needs. Thus, one of the first heating element 61 and the second heating element 62 can preheat the slurry on the current collector 2 so that the drying device 50 can better dry the slurry, and the other can further heat the dried slurry so that the slurry can better adhere to the current collector 2.

[0079] Combined Figure 7 , Figure 7 is a schematic structural diagram of a cleaning device of a pole piece coating device according to one or more embodiments of the present application.

[0080] In some embodiments, the pole piece coating device 1 includes a cleaning device 70. The cleaning device 70 is located upstream of the wetting device 20 on the conveying path 11. The cleaning device 70 includes a cleaning member 71 and a cleaning tank 72. The cleaning member 71 is used to hold the current collector 2 against the cleaning tank 72 to soak the cleaning liquid in the cleaning tank 72. The cleaning device 70 can be used to clean the current collector 2. The cleaning tank 72 can store cleaning liquid, and the cleaning liquid can include but is not limited to at least one of plasma water and cleaning agent or their combination, etc. The cleaning member 71 can be, including but not limited to, a cleaning roller, etc. The number of the cleaning members 71 can be one, two or more. The cleaning roller can hold the current collector 2 against the cleaning tank 72 to soak the cleaning liquid, so that the current collector 2 is fully cleaned. Thus, the current collector 2 can be held by the cleaning member 71 so that the current collector 2 is fully soaked in the cleaning liquid, so that the current collector 2 is fully cleaned and then conveyed to the wetting device 20, improving the adhesion effect of the slurry on the current collector 2 and alleviating the risk that the slurry is difficult to adhere due to impurities on the surface of the current collector 2.

[0081] In some embodiments, the cleaning device 70 includes a liquid scraping member 73. The liquid scraping member 73 is located downstream of the cleaning member 71 on the conveying path 11. The liquid scraping member 73 is used to scrape off a part of the cleaning liquid on the current collector 2 during the conveyance of the current collector 2. The liquid scraping member 73 may include, but is not limited to, a liquid scraping blade. The number of the liquid scraping members 73 may be one, two or more. It can be understood that the liquid scraping member 73 can be in close contact with the current collector 2, so as to facilitate the liquid scraping member 73 to scrape off the residual cleaning liquid on the current collector 2 and reduce the risk of the current collector 2 entering the infiltration device 20 with the attached cleaning liquid. Thus, a part of the cleaning liquid on the current collector 2 can be scraped off by the liquid scraping member 73, alleviating the risk that the excessive residual cleaning liquid on the current collector 2 causes a decline in the subsequent slurry infiltration effect.

[0082] In some embodiments, the cleaning device 70 includes a second vibrator 74. The second vibrator 74 is arranged in the cleaning tank 72. The second vibrator 74 may include, but is not limited to, an ultrasonic vibrator, etc. It can be understood that the first vibrator 25 can generate vibrations in the cleaning tank 72, thereby driving the cleaning liquid to vibrate. The vibration of the cleaning liquid can facilitate the more thorough cleaning of the current collector 2 by the cleaning liquid. Specifically, when the second vibrator 74 is an ultrasonic vibrator, the ultrasonic vibration further improves the effect of the cleaning device 70 in cleaning impurities such as oil stains. Thus, the second vibrator 74 can generate vibrations in the cleaning tank 72, so that the current collector 2 can be cleaned more thoroughly.

[0083] Combined with Figure 8 - Figure 9 , Figure 8 is a schematic structural diagram of a glue discharging roller of a pole piece coating device according to one or more embodiments of the present application; Figure 9 is a fifth schematic structural diagram of a pole piece coating device according to one or more embodiments of the present application.

[0084] In some embodiments, the electrode sheet coating device 1 includes a tape sticking device 80. The tape sticking device 80 includes a tape releasing roller 81, a tape collecting roller 82, and a tape 83. The wetting device 20 is located between the tape releasing roller 81 and the tape collecting roller 82 on the conveying path 11. The tape 83 is attached to a predetermined area on one side surface of the current collector 2 between the tape releasing roller 81 and the tape collecting roller 82. The tape 83 is wound around the tape releasing roller 81 and the tape collecting roller 82. The tape releasing roller 81 and the tape collecting roller 82 rotate during the conveyance of the current collector 2. It should be noted that the part of the current collector 2 where the slurry is coated to form a film layer can form the main body of the electrode sheet. One or both ends of the main body of the electrode sheet also need to form electrode tabs, and the electrode tab part does not need to be coated with slurry and form a film layer. It can be understood that the tape sticking device 80 can attach the tape 83 to a predetermined area on one side surface of the current collector 2 through the tape releasing roller 81. In a state where the tape 83 is attached to a predetermined area on one side surface of the current collector 2, the tape 83 can isolate the predetermined area from the slurry, so that the predetermined area can avoid the slurry during the conveyance of the current collector 2 along the conveying path 11, thereby facilitating subsequent processing of the predetermined area to form electrode tabs. The tape collecting roller 82 can recover the tape 83 attached to the predetermined area, thereby reducing the risk of the tape 83 remaining on the current collector 2. Specifically, before the current collector 2 is conveyed to the wetting device 20, the tape releasing roller 81 attaches the tape 83 to a predetermined area on the current collector 2. After the current collector 2 passes through the wetting device 20, the area without the attached tape 83 is uniformly coated with slurry, and the predetermined area is not coated with slurry. After the current collector 2 leaves the wetting device 20 and the slurry forms a film layer, the tape collecting roller 82 can recover the tape 83 attached to the predetermined area, thereby reducing the influence on subsequent processing. In some application scenarios, the preset area may include a plurality of spaced-apart sub-areas, and the tape 83 can be multiple strips. One strip of tape 83 is correspondingly arranged with one sub-area. Exemplarily, the preset area may include three sub-areas spaced in the width direction of the current collector 2, and three spaced-apart sub-areas may be provided on the tape releasing roller 81, and one strip of tape 83 is correspondingly attached to one sub-area. Thus, the tape 83 can be attached to a predetermined area on one side surface of the current collector 2 through the tape releasing roller 81, so that the predetermined area is isolated from the slurry by the tape 83, making it difficult for the slurry to adhere to the predetermined area of the current collector 2, and the tape 83 is collected by the tape collecting roller 82 after the wetting device 20 processes the current collector 2, which helps to expose the predetermined area of the current collector 2 for subsequent processing, while having a simple structure and a high degree of automation.

[0085] In some embodiments, the number of the pasting devices 80 is two groups, and the pasting tapes 83 of the two groups of pasting devices 80 are respectively pasted on the predetermined areas of the two side surfaces of the current collector 2 between the tape releasing roller 81 and the tape winding roller 82. It can be understood that the two groups of pasting devices 80 can respectively paste the pasting tapes 83 on the predetermined areas of the two side surfaces of the current collector 2, so as to form areas without coated slurry on the two side surfaces, so as to form tabs in subsequent processing. In some application scenarios, the predetermined areas on the opposite side surfaces of the current collector 2 are correspondingly arranged. Thus, it is convenient to expose the predetermined areas on the two side surfaces of the current collector 2 for subsequent processing.

[0086] Combined Figure 10 , Figure 10 is the sixth structural schematic diagram of the pole piece coating device according to one or more embodiments of the present application.

[0087] In some embodiments, the conveying device 10 includes an unwinding assembly 12 and a winding assembly 13 for forming a conveying path 11. The unwinding assembly 12 unwinds the current collector 2, and the winding assembly 13 winds the current collector 2. The unwinding assembly 12 may include, but is not limited to, a driving member and an unwinding cylinder. The driving member may be a motor or the like, and the driving member can drive the unwinding cylinder to rotate to release the current collector 2. The winding assembly 13 may include, but is not limited to, a driving member and a winding cylinder. The driving member may be a motor or the like, and the driving member can drive the winding cylinder to rotate to wind the current collector 2. By the mutual cooperation of the unwinding assembly 12 and the winding assembly 13, a conveying path 11 is formed, so as to stably convey the current collector 2 along the conveying path 11. Thus, the conveying path 11 can be formed by the unwinding assembly 12 and the winding assembly 13 to convey the current collector 2, reduce the jitter and deformation of the current collector 2, improve the conveying efficiency and stability of the current collector 2, and improve the automation degree of the pole piece coating device 1.

[0088] In some embodiments, the conveying device 10 further includes a deviation rectifying assembly 14. The deviation rectifying assembly 14 is located between the unwinding assembly 12 and the winding assembly 13 on the conveying path 11, and the deviation rectifying assembly 14 is used to detect the position of the current collector 2. Exemplarily, the deviation rectifying assembly 14 may include two ultrasonic sensors, and the two ultrasonic sensors are respectively arranged on both sides in the width direction of the current collector 2. The ultrasonic sensors can automatically detect the distance between the current collector 2 and the ultrasonic sensors, so as to judge the position of the current collector 2 according to the distance and adjust the position of the current collector 2. Thus, the position of the current collector 2 can be detected by the deviation rectifying assembly 14, the risk of the current collector 2 deviating during the transmission process is alleviated, and the conveying stability and reliability of the current collector 2 are improved.

[0089] In summary, the current collector coating device 1 provided by the present application includes a conveying device 10 and a wetting device 20. The conveying device 10 is used to convey the current collector 2 along the conveying path 11. The wetting device 20 is located on the conveying path 11. The wetting device 20 includes a slurry tank 21, a wetting member 22, and a scraping member 23. The slurry tank 21 is used to store the slurry. The wetting member 22 is used to hold the current collector 2 against the slurry in the slurry tank 21 to wet the slurry in the slurry tank 21. The scraping member 23 is used to scrape a part of the slurry on the current collector 2 during the conveyance of the current collector 2. Thus, during the process of the conveying device 10 conveying the current collector 2 along the conveying path 11, the wetting member 22 holds the current collector 2 against the slurry in the slurry tank 21, so that the current collector 2 is wetted with the slurry, which facilitates the full coating of the slurry on the current collector 2 and further forms a film layer, improving the coating efficiency. The scraping member 23 further scrapes a part of the slurry on the current collector 2, making the coated slurry more uniform, facilitating the control of the coating thickness of the slurry, and improving the coating effect. Compared with other types of current collector coating devices, the current collector coating device 1 of the present application has a higher efficiency in coating the film layer and a more uniform coating effect.

[0090] 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. These modifications or replacements do not cause the essence of the corresponding technical solutions to 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 herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece coating device, characterized in that: The pole piece coating equipment comprises: A conveying device, used for conveying the current collector along a conveying path; a wetting device, located on the conveying path, comprising a slurry tank, a wetting member and a scraper, wherein the slurry tank is used to store slurry, the wetting member is used to hold the current collector into the slurry tank to wet the slurry in the slurry tank, and the scraper is used to scrape part of the slurry on the current collector during the conveying process of the current collector; The wetting member includes a first wetting roller, and the first position of the first wetting roller is used to push the current collector into the slurry tank to wet the slurry in the slurry tank; The impregnation member comprises a second impregnation roller, the second impregnation roller is located downstream of the first impregnation roller on the conveying path, and the first surface of the current collector abuts against the fourth position of the second impregnation roller, so that the current collector impregnates the slurry in the slurry tank; The scraper member includes a third scraper blade, and the second surface of the current collector contacts a fifth position of the third scraper blade, wherein the first surface and the second surface are arranged opposite to each other in the gravity direction, and the fourth position and the fifth position at least partially overlap in the gravity direction.

2. The pole piece coating equipment according to claim 1, characterized in that: The scraper member includes a first scraper blade and a second scraper blade, the first scraper blade is used to contact the first surface of the current collector, the second scraper blade is used to contact the second surface of the current collector, and the second position where the first scraper blade contacts the current collector and the third position where the second scraper blade contacts the current collector are both located downstream of the first wetting roller on the conveying path.

3. The pole piece coating equipment according to claim 2, characterized in that: The first surface is located upstream of the second surface in the gravity direction, and the second position is located downstream of the third position on the conveying path, so as to allow part of the slurry on the second surface to enter the first surface through the through holes of the current collector under the action of the scraping of the second scraper blade to be scraped by the first scraper blade.

4. The pole piece coating equipment according to claim 1, characterized in that: The scraper member includes a scraper squeezing roller, the first surface of the current collector contacts the sixth position of the second wetting roller, and the position where the scraper squeezing roller contacts the second surface corresponds to the sixth position, wherein the sixth position is downstream of the fourth position on the conveying path.

5. The pole piece coating equipment according to claim 1, characterized in that: The first wetting roller and / or the second wetting roller are movable in the direction of gravity.

6. The pole piece coating equipment according to claim 1, characterized in that: The wetting device includes a first passing roller, which is located between the first wetting roller and the second wetting roller on the conveying path, and the fourth position and the first position are both located downstream of the contact position between the first passing roller and the current collector in the gravity direction.

7. The pole piece coating equipment according to claim 1, characterized in that: The infiltration device includes a first vibrator, and the first vibrator is arranged in the slurry tank.

8. The pole piece coating equipment according to claim 1, characterized in that: The pole piece coating device includes a second roller, which is located upstream of the impregnation member in the direction of gravity, so that part of the current collector is transferred from the impregnation member to the second roller along the direction of gravity.

9. The pole piece coating equipment according to claim 8, characterized in that: The pole piece coating device comprises a blowing member, wherein the blowing member is located between the second roller and the impregnation member in the direction of gravity, and the blowing member is used for blowing air toward the current collector along the direction of gravity.

10. The electrode coating equipment according to claim 1, characterized in that: The pole piece coating equipment comprises a drying device, which is located downstream of the wetting device on the conveying path, and is used to dry the slurry on the current collector.

11. The pole piece coating equipment according to claim 10, characterized in that: The pole piece coating equipment comprises a heating device, the heating device and the drying device are arranged adjacent to each other, and the heating device is used to heat the slurry on the current collector.

12. The pole piece coating equipment according to claim 11, characterized in that: The heating device includes a first heating element, and the first heating element is located upstream or downstream of the drying device on the conveying path.

13. The pole piece coating equipment according to claim 12, characterized in that: The heating device includes a second heating element, and the drying device is located between the first heating element and the second heating element on the conveying path.

14. The electrode coating equipment according to claim 1, characterized in that: The electrode coating equipment includes a cleaning device, which is located upstream of the wetting device on the conveying path. The cleaning device includes a cleaning piece and a cleaning tank. The cleaning piece is used to support the current collector to the cleaning tank to infiltrate the cleaning liquid in the cleaning tank.

15. The pole piece coating equipment according to claim 14, characterized in that: The cleaning device comprises a liquid scraping member, which is located downstream of the cleaning member on the conveying path, and is used to scrape off part of the cleaning liquid on the current collector during the conveying process of the current collector.

16. The pole piece coating equipment according to claim 14, characterized in that: The cleaning device includes a second vibrator, and the second vibrator is arranged in the cleaning tank.

17. The pole piece coating equipment according to claim 1, characterized in that: The electrode coating equipment includes a glue sticking device, which includes a glue putting roller, a glue collecting roller and glue sticking. The impregnation device is located between the glue putting roller and the glue collecting roller on the conveying path. The glue sticking is applied to a predetermined area on one side surface of the current collector between the glue putting roller and the glue collecting roller. The glue sticking is wound around the glue putting roller and the glue collecting roller. The glue putting roller and the glue collecting roller rotate during the conveying of the current collector.

18. The pole piece coating equipment according to claim 17, characterized in that: There are two groups of glue sticking devices, and the glue sticking devices of the two groups are respectively applied to predetermined areas on both side surfaces of the current collector between the glue placing roller and the glue collecting roller.

19. The electrode coating device according to any one of claims 1 to 18, characterized in that: The conveying device includes an unwinding assembly and a winding assembly for forming the conveying path, the unwinding assembly unwinds the current collector, and the winding assembly winds up the current collector.

20. The pole piece coating equipment according to claim 19, characterized in that: The conveying device further comprises a deviation correction component, wherein the deviation correction component is located between the unwinding component and the winding component on the conveying path, and the deviation correction component is used to detect the position of the current collector.

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