Pole piece coating equipment

Abstract

The invention discloses pole piece coating equipment. The pole piece coating equipment comprises a conveying device and an infiltration device, and the conveying device is used for conveying a current collector along a conveying path; the infiltration device is located on the conveying path and comprises a slurry tank, an infiltration part and a scraping part, the slurry tank is used for storing slurry, the infiltration part is used for abutting against the current collector into the slurry tank to infiltrate the slurry in the slurry tank, and the scraping part is used for scraping part of the slurry on the current collector in the current collector conveying process. Therefore, in the process that the conveying device conveys the current collector along the conveying path, the infiltration piece abuts against the current collector into the slurry tank, so that the current collector infiltrates the slurry, the slurry is conveniently and fully coated on the current collector, a film layer is formed, the coating efficiency is improved, the scraping piece further scrapes part of the slurry on the current collector, and the coating efficiency is improved. The coating of the slurry after blade coating is more uniform, the coating thickness of the slurry is convenient to control, and the coating effect is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece coating device. Background Art

[0002] Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

[0003] The battery device includes one or more battery cells, and one or more electrode assemblies are arranged inside the battery cells. The electrode assembly can be formed by winding or stacking pole sheets. The pole sheets include 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 needs to be solved urgently. 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] In order to solve the above problems, the present application provides a pole piece coating device, which includes a conveying device and an impregnation device. The conveying device is used to convey the current collector along the conveying path; the impregnation device is located on the conveying path, and the impregnation device includes a slurry tank, an impregnation member and a scraper member. The slurry tank is used to store the slurry, the impregnation member is used to hold the current collector in the slurry tank to impregnate the slurry in the slurry tank, and the scraper member is used to scrape part of the slurry on the current collector during the conveying process of the current collector. Thus, in the process of the conveying device conveying the current collector along the conveying path, the impregnation member holds the current collector in the slurry tank so that the current collector is impregnated with the slurry, thereby facilitating the slurry to be fully coated on the current collector, thereby forming a film layer, improving the coating efficiency, and the scraper member further scrapes part of the slurry on the current collector, so that the slurry coating after scraping is more uniform, which is convenient for controlling 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 piece and a second scraping piece. 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 first scraping piece is used to contact the first surface of the current collector, and the second scraping piece is used to contact the 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, and the second position where the first scraping piece contacts the current collector and the third position where the second scraping piece contacts the current collector are both located downstream of the first wetting roller on the conveying path. Thus, the current collector can be pushed against the first position of the first wetting roller to make the current collector wet the slurry, and the first scraping piece and the second scraping piece downstream can be used to scrape the first surface and the second surface separately, so that the slurry coating on the first surface and the second surface is more uniform, which is convenient for controlling the slurry coating thickness on the first surface and the second surface, and it is convenient for the scraped part of the slurry to fall naturally under the action of gravity, thereby improving the coating effect.

[0007] In some embodiments, the first surface is located upstream of the second surface in the direction of gravity, 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 hole of the current collector under the action of the second scraper blade to be scraped by the first scraper blade. Thus, at the third position, the second scraper blade first scrapes the second surface, and scrapes part of the slurry into the through hole of the current collector to enter the first surface through the through hole, thereby facilitating the slurry to fill the through hole and facilitating the discharge of bubbles in the through hole. At the same time, the first scraper blade scrapes the slurry coated on the first surface and part of the slurry entering the first surface under the action of the second scraper blade at the second position, 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, which is located downstream of the first wetting roller on the conveying path, and the first surface of the current collector abuts against the fourth position of the second wetting roller, so that the current collector infiltrates the slurry in the slurry tank. Thus, the fourth position of the second wetting roller abuts against the first surface of the current collector, so that the current collector infiltrates the slurry in the slurry tank again, thereby facilitating the slurry to be more fully coated on the current collector, thereby forming a film layer, and improving the coating efficiency.

[0009] In some embodiments, the scraper includes a third scraper blade, and the second surface of the current collector contacts the fifth position of the third scraper blade, wherein the fourth position and the fifth position at least partially overlap in the gravity direction. Thus, the third scraper blade cooperates with the second wetting roller to scrape the first surface and the second surface of the current collector, so as to better control the first surface and the slurry thickness on the first surface, so that the slurry coating is more uniform.

[0010] In some embodiments, the scraper member includes a scraper squeezing roller, the first surface of the current collector contacts the sixth position of the second impregnation roller, and the position where the scraper squeezing roller contacts the second surface corresponds to the sixth position, wherein the sixth position is located downstream of the fourth position on the conveying path. Thus, the second impregnation roller and the scraper squeezing roller cooperate to squeeze the first surface and the second surface of the current collector at the sixth position, thereby better controlling the slurry coating thickness on the current collector and further improving the slurry coating uniformity.

[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 level in the slurry tank, so that the first wetting roller and the second wetting roller can hold the current collector into the slurry in the slurry tank, thereby improving the flexibility of the pole piece coating equipment and alleviating the risk of insufficient wetting caused by the slurry 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 impregnation device includes a first roller, the first roller is located between the first impregnation roller and the second impregnation roller on the conveying path, and the fourth position and the first position are both located downstream of the contact position between the first roller and the current collector in the direction of gravity. Thus, the current collector can be guided and supported between the first impregnation roller and the second impregnation roller by the first roller, reducing the risk of shaking and deformation of the current collector. At the same time, the fourth position and the first position are both located downstream of the contact position between the first roller and the current collector in the direction of gravity, which facilitates the slurry on the current collector to flow to the first position and the fourth position under the action of gravity, thereby alleviating the risk of the slurry accumulating at the first roller under the action of gravity, resulting in uneven thickness.

[0013] In some embodiments, the wetting device includes a first vibrator, which is disposed in the slurry tank. Thus, the first vibrator can generate vibrations in the slurry tank, which helps to discharge bubbles in the slurry, reduce the risk of bubbles in the slurry coated on the current collector, and facilitate further infiltration of the current collector.

[0014] In some embodiments, the pole piece coating device includes a second roller, which is located upstream of the impregnating member in the direction of gravity, so that part of the current collector is transferred from the impregnating member to the second roller along the direction of gravity. As a result, in the process of transferring the current collector from the impregnating member to the second 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 excess slurry on the current collector and improve the coating uniformity of the slurry. At the same time, the structure is simple, gravity is fully utilized, and costs are saved.

[0015] In some embodiments, the pole piece coating device includes a blowing member, which is located between the second roller and the impregnation member in the direction of gravity, and is used to blow air toward the current collector in the direction of gravity. Thus, the blowing member can blow air toward the current collector in the direction of gravity, thereby blowing off excess slurry on the current collector in coordination with gravity, further improving the coating uniformity of the slurry.

[0016] In some embodiments, the electrode coating device includes a drying device, which is located downstream of the impregnation device on the conveying path, and is used to dry the slurry on the current collector. Thus, the slurry on the current collector can be dried by the drying device, so that the slurry is solidified to form a film layer.

[0017] In some embodiments, the electrode coating device includes a heating device, and 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. Thus, the slurry can be fully dried by the heating device in conjunction with the drying device, thereby alleviating the risk of insufficient curing caused by insufficient drying temperature of the slurry.

[0018] In some embodiments, 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. Thus, the slurry can be fully dried by the first heating element in cooperation with the drying device, thereby alleviating the risk of insufficient curing due to insufficient drying temperature of the slurry, and at the same time, the length of the drying device on the conveying path can be reduced, thereby saving costs.

[0019] In some embodiments, 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. Thus, one of the first heating element and the second heating element can preheat the slurry on the current collector so that the drying device can better dry the slurry, and the other can further heat the dried slurry so that the slurry is better attached to the current collector.

[0020] In some embodiments, the electrode coating device includes a cleaning device, which is located upstream of the impregnation device on the conveying path, and includes a cleaning member and a cleaning tank, and the cleaning member is used to hold the current collector against the cleaning tank to impregnate the cleaning liquid in the cleaning tank. Thus, the current collector can be held against the cleaning member to fully impregnate the cleaning liquid, so that the current collector is fully cleaned before being conveyed to the impregnation device, thereby improving the adhesion effect of the slurry on the current collector and alleviating the risk of the slurry being difficult to adhere to due to impurities on the surface of the current collector.

[0021] In some embodiments, the cleaning device includes a scraper, 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. Thus, part of the cleaning liquid on the current collector can be scraped off by the scraper, alleviating the risk of excessive residual cleaning liquid on the current collector causing a decrease in subsequent slurry infiltration effect.

[0022] In some embodiments, the cleaning device includes a second vibrator, and the second vibrator is disposed in the cleaning tank. Thus, the second vibrator can generate vibration in the cleaning tank, so that the current collector is cleaned more fully.

[0023] In some embodiments, the electrode coating device includes a glue sticking device, which includes a glue putting roller, a glue collecting roller and a glue sticking device. The impregnation device is located between the glue putting roller and the glue collecting roller on the conveying path. The glue sticking device 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 device 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 process of the current collector. Thus, the glue sticking device can be applied to a predetermined area on one side surface of the current collector by the glue putting roller, thereby isolating the predetermined area from the slurry by the glue sticking device, making it difficult for the slurry to adhere to the predetermined area of ​​the current collector. After the current collector is processed by the impregnation device, the glue sticking device is collected by the glue collecting roller, thereby helping 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 high.

[0024] In some embodiments, 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 sides of the current collector between the glue putting roller and the glue collecting roller, thereby facilitating the exposure of predetermined areas on both sides of the current collector for subsequent processing.

[0025] In some embodiments, the conveying device includes an unwinding assembly and a rewinding assembly for forming a conveying path, wherein the unwinding assembly unwinds the current collector, and the rewinding assembly rewinds the current collector. Thus, a conveying path can be formed by the unwinding assembly and the rewinding assembly to convey the current collector, thereby reducing the shaking and deformation of the current collector, improving the conveying efficiency and stability of the current collector, and improving the automation of the electrode coating equipment.

[0026] In some embodiments, the conveying device further includes a deviation correction component, which is located between the unwinding component and the winding component on the conveying path, and is used to detect the position of the current collector. Thus, the position of the current collector can be detected by the deviation correction component, which reduces the risk of the current collector being offset during the transmission process, and improves the transmission stability and reliability of the current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a first structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application; Figure 2 is a schematic structural diagram of a current collector according to one or more embodiments of the present application; Figure 3 is a second structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application; Figure 4 is a third structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application; Figure 5 is a schematic structural diagram of a drying device and a heating device of a pole piece coating device according to one or more embodiments of the present application; Figure 6 is a fourth structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application; Figure 7 is a schematic structural diagram of a cleaning device for a pole piece coating device according to one or more embodiments of the present application; Figure 8 is a schematic structural diagram of a glue-dispensing roller of a pole piece coating device according to one or more embodiments of the present application; Fig. 9 is a fifth structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application; Fig.10 This is the sixth structural schematic diagram of the electrode coating equipment according to one or more embodiments of the present application.

[0029] Reference numerals: electrode 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 correction assembly 14; wetting device 20; slurry tank 21; wetting member 22; first wetting roller 221; second wetting roller 222; scraper 23; first scraper blade 231; second scraper blade 232; third scraper blade 233; scraper squeeze roller 234; first roller 2 4; first vibrator 25; second roller 30; blowing element 40; drying device 50; heating device 60; first heating element 61; second heating element 62; cleaning device 70; cleaning element 71; cleaning tank 72; scraping element 73; second vibrator 74; glue application device 80; glue release roller 81; glue collection roller 82; glue application 83; first position p1; second position p2; third position p3; fourth position p4; fifth position p5; sixth position p6; gravity direction x1. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0035] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0039] During the manufacturing process of the battery, a film layer needs to be coated on the current collector. Currently, there is only one way to coat the film layer on the current collector, and the coating effect is poor.

[0040] In order to solve the technical problems existing in the related art, a pole piece coating device is provided. The pole piece coating device can transport the current collector through the transport device, hold the current collector into the slurry tank through the impregnation member in the impregnation device to impregnate the slurry, and scrape part of the slurry on the current collector through the scraping member to form a film layer, thereby improving the efficiency of coating the film layer on the current collector, and making the thickness of the film layer more uniform, thereby improving the coating effect.

[0041] A battery device may generally include a housing and battery cells, and the battery cells are contained in the housing. In a battery, there may be multiple battery cells, and the multiple battery cells may be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells is contained in the housing; of course, the battery device may also be a battery module formed by connecting multiple battery cells in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and contained in the housing. The battery device may also include other structures. For example, the battery may also include a busbar component for realizing electrical connection between multiple battery cells.

[0042] The production methods of battery cells include stacking and winding, that is, battery cells are divided into stacking cells and winding cells. Stacking cells have uniform current collection effect, small internal resistance and large specific power, but in order to improve precision, the mold precision is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. Winding batteries are simple to make, and the production and assembly processes have general requirements for equipment precision, high production efficiency and low cost. In terms of performance, wound batteries have excellent high and low temperature performance, very fast charging, ultra-long life, stable high output voltage, strong structure and strong shock resistance.

[0043] 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. An electrode assembly is a component in a battery cell where electrochemical reactions occur. The housing may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet.

[0044] The pole piece can be a positive pole piece or a negative pole piece. The part of the pole piece with active material constitutes the main body of the electrode assembly, and the part of the pole piece without active material each constitutes a pole ear. During the charge and discharge process of the battery, the active material reacts with the electrolyte, and the pole ear connects the electrode terminal to form a current loop. The pole piece may include a current collector and an active material arranged on at least one surface of the current collector. The active material can be coated on the current collector in the form of a slurry to form a film layer on the current collector, and the film layer can be fixed on the current collector by 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.

[0045] 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.

[0046] Please refer to Figure 1 , Figure 1 It is a first structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application. The electrode coating equipment 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, and the wetting device 20 includes a slurry tank 21, a wetting member 22 and a scraper 23. The slurry tank 21 is used to store slurry, the wetting member 22 is used to support the current collector 2 into the slurry tank 21 to wet the slurry in the slurry tank 21, and the scraper 23 is used to scrape part of the slurry on the current collector 2 during the conveyance of the current collector 2.

[0047] 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 treated with silver, 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 (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.).

[0048] The conveying device 10 can carry the current collector 2 and convey the current collector 2 along the conveying path 11. For example, the conveying device 10 may include a driving member and a bearing member. The driving member may include but is not limited to a motor, etc., and the bearing member may include but is not limited to a conveying roller, etc. The infiltration device 20 is arranged on the conveying path 11 formed by the conveying device 10 so that the current collector 2 passes through the infiltration device 20 during the conveying process. The slurry tank 21 stores slurry. As an example, the slurry material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds, and other traditional materials that can be used as positive active materials for batteries can also be used. These positive active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to 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 iron manganese phosphate, and lithium iron manganese phosphate. At least one of the composite materials and carbon. Examples of lithium transition metal oxides 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 modified compounds thereof. The slurry tank 21 may be provided with an inlet and outlet for replenishing or discharging the slurry.

[0049] The impregnation member 22 can hold the current collector 2 against the slurry tank 21. It can be understood that the impregnation member 22 holds the current collector 2 against the slurry in the slurry tank 21 so that the slurry fully infiltrates the current collector 2. The slurry can adhere to the current collector 2 and be transported along the conveying path 11 with the current collector 2. After the slurry is dried and solidified, a film layer can be formed on the current collector 2. The scraper 23 can scrape the current collector 2 during the conveying process of the current collector 2, so as to scrape off part of the slurry on the current collector 2. For example, the scraper 23 can keep a certain distance from the current collector 2. When the thickness of the slurry attached to the current collector 2 is greater than the distance between the scraper 23 and the current collector 2, the scraper 23 can scrape off the part of the slurry that exceeds the thickness from the current collector 2, and make the remaining part of the slurry that does not exceed the thickness more flat and uniform. It can be understood that the distance between the scraper 23 and the current collector 2 can be adjusted according to the actual film thickness requirement on the current collector 2.

[0050] Through the above-mentioned embodiment, when the conveying device 10 conveys the current collector 2 along the conveying path 11, the wetting member 22 holds the current collector 2 into the slurry tank 21 so that the current collector 2 is infiltrated with the slurry, thereby facilitating the slurry to be fully coated on the current collector 2 and then forming a film layer, thereby improving the coating efficiency. The scraping member 23 further scrapes part of the slurry on the current collector 2, so that the slurry coating after scraping is more uniform, which is convenient for controlling the coating thickness of the slurry and improving the coating effect.

[0051] In some embodiments, the wetting member 22 includes a first wetting roller 221, and the scraper member 23 includes a first scraper sheet 231 and a second scraper sheet 232. The first position p1 of the first wetting roller 221 is used to hold the collector 2 into the slurry tank 21 to wet the slurry in the slurry tank 21. The first scraper sheet 231 is used to contact the first surface 100 of the collector 2, and the second scraper sheet 232 is used to contact the second surface 200 of the collector 2, wherein the first surface 100 and the second surface 200 are arranged opposite to each other in the gravity direction x1, and the second position p2 where the first scraper sheet 231 contacts the collector 2 and the third position p3 where the second scraper sheet 232 contacts the collector 2 are both located downstream of the first wetting roller 221 on the conveying path 11. The first wetting roller 221 holds the current collector 2 against the slurry in the slurry tank 21 so that the slurry fully infiltrates the current collector 2. The second position p2 and the third position p3 are both located 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 infiltrated 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 and the slurry in the slurry tank 21 can be in a separated state and contact the first scraper blade 231 and the second scraper blade 232 respectively. The first scraper blade 231 can scrape part of the slurry on the first surface 100, and the second scraper blade 232 can scrape part of the slurry on the second surface 200. It should be noted that the first scraper sheet 231 contacts the first surface 100 of the current collector 2, which may refer to the first scraper sheet 231 directly contacting the first surface 100, or the first scraper sheet 231 indirectly contacting the first surface 100 through the slurry on the first surface 100, and the second scraper sheet 232 contacts the second surface 200 of the current collector 2. Similarly, for example, the first scraper sheet 231 and the first surface 100 of the current collector 2 can maintain a first distance, and at the first position p1, the slurry thickness on the first surface 100 of the current collector 2 is greater than the first distance, and the first scraper sheet 231 can indirectly contact the first surface 100 through the slurry, and block and scrape off the slurry with a thickness greater than the first spacing, so that the slurry thickness on the first surface 100 of the current collector 2 after passing the first position p1 is less than or equal to the first spacing. At the same time, the slurry remaining on the first surface 100 can be squeezed to a certain extent, so that the slurry can better adhere 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 spacing can be adjusted according to actual needs.

[0052] It should be noted that the first surface 100 and the second surface 200 are arranged opposite to each other in the gravity direction x1, which does not limit the first surface 100 and the second surface 200 to be arranged opposite to each other in the gravity direction x1 throughout the conveying path 11, but is for the purpose of illustrating the relative positional relationship between the first surface 100 and the second surface 200 at at least part of the position on the conveying path 11. The first surface 100 and the second surface 200 are arranged opposite to each other in the gravity direction x1, which is convenient for better conveying the current collector 2, and it is easy to set the position of the first scraper blade 231 and the second scraper blade 232, and the structure is simple. In some application scenarios, the second position p2 and the third position p3 can be set corresponding to the slurry tank 21 in the gravity direction x1, so that part of the slurry scraped by the first scraper blade 231 and the second scraper blade 232 naturally falls back into the slurry tank 21 under the action of gravity, thereby improving the scraping efficiency. Thus, the first position p1 of the first wetting roller 221 can be used to support the current collector 2 so that the current collector 2 can be soaked with the slurry, and the first surface 100 and the second surface 200 can be scraped separately by the downstream first scraper blade 231 and the second scraper blade 232, so that the slurry coating on the first surface 100 and the second surface 200 is more uniform, which is convenient for controlling the slurry coating thickness on the first surface 100 and the second surface 200, and is convenient for the scraped part of the slurry to fall naturally under the action of gravity, thereby improving the coating effect.

[0053] Combination Figure 1-Figure 2 , Figure 2 is a schematic diagram of the structure of a current collector according to one or more embodiments of the present application.

[0054] In some embodiments, the first surface 100 is located upstream of the second surface 200 in the gravity direction x1, and the second position p2 is located downstream of the third position p3 on the conveying path 11, so as to allow part of the slurry on the second surface 200 to enter the first surface 100 through the through hole 300 of the current collector 2 under the action of the second scraper blade 232 to be scraped by the first scraper blade 231. It should be noted that a plurality of through holes 300 connecting the first surface 100 and the second surface 200 may be formed on the current collector 2. During the process of the current collector 2 infiltrating the slurry, the slurry may be filled in the through hole 300 and connected with the slurry on the first surface 100 and the second surface 200. In practical applications, there may be some bubbles inside the slurry, and there is a risk that the bubbles remain in the through hole 300 and are difficult to discharge. In some application scenarios, a plurality of through holes 300 may be arranged in an array on the current collector 2. The second position p2 on the conveying path 11 is located downstream of the third position p3. It can be understood that at the third position p3, the second scraper blade 232 scrapes the slurry on the second surface 200. The second scraper blade 232 can produce a certain extrusion effect on the slurry on the second surface 200, thereby pressing part of the slurry into the through hole 300, and then entering the first surface 100 through the through hole 300. After that, the current collector 2 passes through the third position p3 to reach the second position p2, and the first scraper blade 231 can simultaneously scrape and extrude the slurry originally attached to the first surface 100 and the slurry entering the first surface 100 through the through hole 300. It should be noted that, compared with the first surface 100 being scraped preferentially, the second surface 200 located downstream in the gravity direction x1 is scraped preferentially, which reduces the amount of slurry on the second surface 200 that falls off the current collector 2 under the action of gravity before the second surface 200 is scraped. As a result, when the second scraper blade 232 scrapes the second surface 200, the slurry on the second surface 200 is more sufficient, and more slurry can enter the first surface 100 through the through hole 300, thereby effectively reducing the bubbles in the slurry in the through hole 300, making it easier for the slurry to fill the through hole 300, and at the same time increasing the amount of slurry when the first scraper blade 231 scrapes the first surface 100 at the second position p2, so that the slurry is more fully coated on the first surface 100. Thus, at the third position p3, the second scraper blade 232 first scrapes the second surface 200, and scrapes part of the slurry into the through hole 300 of the current collector 2, so as to enter the first surface 100 through the through hole 300, thereby facilitating the slurry to fill the through hole 300 and facilitating the discharge of bubbles in the through hole 300. At the same time, the first scraper blade 231 scrapes the slurry coated on the first surface 100 and part of the slurry entering the first surface 100 under the action of the second scraper blade 232 at the second position p2, further making the slurry coating on the first surface 100 more sufficient and uniform.

[0055] In some embodiments, the impregnation member 22 includes a second impregnation roller 222, which is located downstream of the first impregnation roller 221 on the conveying path 11, and the first surface 100 of the current collector 2 is abutted against the fourth position p4 of the second impregnation roller 222, so that the current collector 2 is impregnated with the slurry in the slurry tank 21. The second impregnation roller 222 is abutted against the first surface 100 of the current collector 2, and the current collector 2 is impregnated into the slurry in the slurry tank 21 again, which increases the number and time of the current collector 2 being impregnated with the slurry, and improves the impregnation effect of the current collector 2. Therefore, the fourth position p4 of the second impregnation roller 222 can be used to abut against the first surface 100 of the current collector 2, so that the current collector 2 is impregnated with the slurry in the slurry tank 21 again, so that the slurry is more fully coated on the current collector 2, and then a film layer is formed, thereby improving the coating efficiency.

[0056] In some embodiments, the scraper 23 includes a third scraper blade 233, and the second surface 200 of the current collector 2 contacts the fifth position p5 of the third scraper blade 233, wherein 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 scraper 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 scraper 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 from the gravity direction x1 and the reverse 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 retained slurry. Thus, the third scraper blade 233 cooperates with the second wetting roller 222 to scrape the first surface 100 and the second surface 200 of the current collector 2, so as to better control the slurry thickness on the first surface 100 and the first surface 100, so that the slurry coating is more uniform.

[0057] In some embodiments, the first wetting roller 221 and / or the second wetting roller 222 can move in the gravity direction x1. It is understandable that during the process of wetting the slurry, the slurry level in the slurry tank 21 will change. For example, when the slurry is not added to the slurry tank 21, the slurry in the slurry tank 21 will gradually decrease, so that the slurry level in the slurry tank 21 continues to decrease. 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 to match the slurry level in the slurry tank 21, thereby facilitating the first wetting roller 221 and the second wetting roller 222 to better hold the current collector 2 below the slurry level and improve 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 slurry liquid level in the slurry tank 21, so that the first wetting roller 221 and the second wetting roller 222 can hold the current collector 2 into the slurry in the slurry tank 21, thereby improving the flexibility of the electrode coating equipment 1 and alleviating the risk of insufficient wetting due to the slurry liquid level in the slurry tank 21 being lower than the position where the current collector 2 is held by the first wetting roller 221 and the second wetting roller 222.

[0058] In some embodiments, the wetting device 20 includes a first roller 24, which is located between the first wetting roller 221 and the second wetting roller 222 on the conveying path 11, and the fourth position p4 and the first position p1 are both located downstream of the contact position between the first roller 24 and the current collector 2 in the gravity direction x1. The first roller 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 roller 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 toward the first roller 24, resulting in uneven thickness and causing the first roller 24 to easily interfere with the slurry in the slurry tank 21. Compared with this method, the fourth position p4 and the first position p1 are both located downstream of the contact position between the first roller 24 and the current collector 2 in the gravity direction x1, which facilitates the excess slurry between the first position p1 and the first roller 24 to flow toward the first wetting roller 221, and facilitates the excess slurry between the first roller 24 and the fourth position p4 to flow toward the second wetting roller 222, thereby making full use of the slurry to infiltrate the current collector 2 and facilitating the excess slurry to flow back into the slurry tank 21. Thus, the first roller 24 can be used to guide and support the current collector 2 between the first wetting roller 221 and the second wetting roller 222, thereby reducing the risk of shaking and deformation of the current collector 2. At the same time, the fourth position p4 and the first position p1 are both located downstream of the contact position between the first roller 24 and the current collector 2 in the gravity direction x1, which facilitates the slurry on the current collector 2 to flow to the first position p1 and the fourth position p4 under the action of gravity, thereby alleviating the risk of the slurry accumulating at the first roller 24 under the action of gravity, resulting in uneven thickness.

[0059] In some embodiments, the infiltration device 20 includes a first vibrator 25, which is disposed in the slurry tank 21. The first vibrator 25 may include, but is not limited to, an ultrasonic vibrator, etc. It is understood that the first vibrator 25 can generate vibrations in the slurry tank 21, thereby driving the slurry to vibrate, and the slurry vibration can reduce bubbles that may be mixed in the slurry. Further, the vibration can also facilitate the slurry to more fully infiltrate the current collector 2. For example, when the current collector 2 is provided with a through hole 300, the slurry vibration facilitates the slurry to more easily enter the through hole 300. Thus, the first vibrator 25 can generate vibrations in the slurry tank 21, which helps to discharge bubbles in the slurry, reduce the risk of bubbles appearing in the slurry coated on the current collector 2, and facilitate further infiltration of the current collector 2.

[0060] Combination Figure 3-Figure 4 , Figure 3 is a second structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application; Figure 4This is a third structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application. In some embodiments, the scraper 23 includes a scraper squeezing roller 234, and the first surface 100 of the current collector 2 contacts the sixth position p6 of the second wetting roller 222, and the position where the scraper squeezing roller 234 contacts the second surface 200 corresponds to the sixth position p6, wherein the sixth position p6 is located downstream of the fourth position p4 on the conveying path 11. The sixth position p6 is located downstream of the fourth position p4 on the conveying path 11, so that the scraper squeezing roller 234 can squeeze and scrape the excess slurry on the current collector 2 after the second wetting. The scraper squeezing 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 scraper squeezing 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 scraper squeezing 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 slurry coating thickness on the current collector 2 and further improve the slurry coating uniformity.

[0061] In some embodiments, the electrode coating device 1 includes a second roller 30, which is located upstream of the impregnation member 22 in the gravity direction x1, so that part of the current collector 2 is transferred from the impregnation member 22 to the second roller 30 along the gravity direction x1. The second 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 in the process of conveying part of the current collector 2 from the impregnation member 22 to the second roller 30 along the gravity direction x1, the excess slurry on the current collector 2 can fall naturally under the action of the gravity direction x1, so that gravity can be fully utilized to reduce the excess slurry. In some application scenarios, the transmission path between the impregnation member 22 and the second 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 to the gravity direction x1 during the process of being transported from the impregnation member 22 to the second roller 30. For example, the angle between the current collector 2 and the gravity direction x1 during the process of being transported from the impregnation member 22 to the second 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, so that the excess slurry on the opposite sides of the current collector 2 can fall naturally. As a result, in the process of the current collector 2 being transferred from the impregnation member 22 to the second roller 30, part of the slurry on the current collector 2 can fall naturally under the action of gravity to separate from the current collector 2, which helps to reduce the excess slurry on the current collector 2 and improve the coating uniformity of the slurry. At the same time, the structure is simple, gravity is fully utilized, and costs are saved.

[0062] In some embodiments, the pole piece coating device 1 includes a blowing member 40, and the blowing member 40 is located between the second roller 30 and the impregnation member 22 in the gravity direction x1, and the blowing member 40 is used to blow air toward the current collector 2 along the gravity direction x1. The blowing member 40 can blow air toward the current collector 2 along the gravity direction x1. For example, the blowing member 40 can include but is not limited to a wind knife mechanism and the like. The blowing member 40 can control the change in air pressure to generate an airflow, and blow toward the current collector 2 along the gravity direction x1, thereby driving the excess slurry on the current collector 2 to fall in cooperation with gravity, and at the same time making the slurry retained on the current collector 2 more evenly coated. Therefore, the blowing member 40 can be used to blow air toward the current collector 2 along the gravity direction x1, so as to blow off the excess slurry on the current collector 2 in cooperation with gravity, and further improve the coating uniformity of the slurry.

[0063] In some embodiments, the electrode coating device 1 includes a drying device 50, which is located downstream of the impregnation 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 solidified to form a stable film layer after heating and drying. In some application scenarios, the drying device 50 may include an insulating box, which has an inlet and an outlet connecting the inside and outside of the box, and the current collector 2 can enter and exit the insulating box through the inlet and the outlet. A heating plate is provided inside the insulating box, and the heating plate can be used to heat the current collector 2. The insulating box can also be provided with a heat dissipation window and a fan, so as to facilitate improving the temperature stability inside the insulating box. The fan can be installed on both sides of the insulating box and correspond to the two side surfaces opposite to the current collector 2, so as to dry both side surfaces of the current collector 2 at the same time. Further, the drying device 50 can 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 solidification of the slurry to form a film layer.

[0064] Combination Figure 5-Figure 6 , Figure 5 is a schematic structural diagram of a drying device and a heating device of a pole piece coating device according to one or more embodiments of the present application; Figure 6 This is a fourth structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application. In some embodiments, the pole piece coating device 1 includes a heating device 60, and the heating device 60 and the drying device 50 are arranged adjacently, and the heating device 60 is used to heat the slurry on the current collector 2. The heating device 60 can heat the slurry, and the heating device 60 can be located upstream or downstream of the drying device 50 on the conveying path 11. It should be noted that the adjacent arrangement of the heating device 60 and the drying device 50 can refer to the heating device 60 and the drying device 50 being close to each other on the conveying path 11. For example, no other device is arranged between the heating device 60 and the drying device 50. When the heating device 60 is located upstream of the drying device 50, the heating device 60 can preheat the slurry on the current collector 2, so that the slurry is better attached to the current collector 2. Further, the preheating temperature can be lower than the heating temperature of the drying device 50, thereby alleviating the risk of the slurry directly entering the drying device 50 and being heated too quickly, resulting in cracking of the film layer. At the same time, the length of the drying device 50 can also be reduced by the heating device 60, thereby saving costs. When the heating device 60 is located downstream 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 is better attached to the current collector 2. The heating device 60 may include, but is not limited to, a magnetic induction heating system and a laser heating system, etc. Thus, the slurry can be fully dried by the heating device 60 in cooperation with the drying device 50, thereby alleviating the risk of insufficient curing due to insufficient drying temperature of the slurry, and at the same time, the length of the drying device 50 on the conveying path 11 can be reduced, thereby saving costs.

[0065] In some embodiments, the heating device 60 includes a first heating element 61, which is located upstream or downstream of the drying device 50 on the conveying path 11. The first heating element 61 may include, but is not limited to, a magnetic induction heating system and a laser heating system, etc. Exemplarily, the first heating element 61 may be arranged upstream of the drying device 50. Specifically, the first heating element 61 may be a magnetic induction heating system, and the magnetic induction heating system may include two magnetic induction heating plates, which may be respectively arranged on opposite sides of the current collector 2, thereby preheating 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 arbitrarily set according to actual needs. Thus, the slurry can be fully dried by cooperating with the drying device 50 through the first heating element 61, alleviating the risk of insufficient curing due to insufficient drying temperature of the slurry.

[0066] In some embodiments, the heating device 60 includes a second heating element 62, and 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 solidify 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 may include two laser emitters, and the two laser emitters can be respectively arranged on opposite sides of the current collector 2, so as to further heat and solidify 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 arbitrarily set 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.

[0067] Combination Figure 7 , Figure 7 It is a schematic diagram of the structure of a cleaning device for a pole piece coating device according to one or more embodiments of the present application. In some embodiments, the pole piece coating device 1 includes a cleaning device 70, which is located upstream of the infiltration device 20 on the conveying path 11, and the cleaning device 70 includes a cleaning member 71 and a cleaning tank 72, and the cleaning member 71 is used to hold the current collector 2 to the cleaning tank 72 to infiltrate 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 a cleaning liquid, and the cleaning liquid can include but is not limited to at least one of plasma water and a cleaning agent or a combination thereof. The cleaning member 71 can be, but is not limited to, a cleaning roller, etc. The number of cleaning members 71 can be one, two or more. The cleaning roller can hold the current collector 2 to the cleaning tank 72 to infiltrate 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 infiltrated with the cleaning liquid, so that the current collector 2 is fully cleaned and then transported to the infiltration device 20, thereby improving the adhesion effect of the slurry on the current collector 2 and alleviating the risk of the slurry being difficult to adhere to due to impurities on the surface of the current collector 2.

[0068] In some embodiments, the cleaning device 70 includes a scraper 73, which is located downstream of the cleaning member 71 on the conveying path 11, and the scraper 73 is used to scrape off part of the cleaning liquid on the current collector 2 during the conveying process of the current collector 2. The scraper 73 may include but is not limited to a scraper blade, and the number of scrapers 73 may be one, two or more. It can be understood that the scraper 73 can be in close contact with the current collector 2, so that the scraper 73 can scrape off the residual cleaning liquid on the current collector 2, reducing the risk of the current collector 2 adhering to the cleaning liquid and entering the infiltration device 20. Thus, part of the cleaning liquid on the current collector 2 can be scraped off by the scraper 73, alleviating the risk of the subsequent slurry infiltration effect being reduced due to excessive residual cleaning liquid on the current collector 2.

[0069] In some embodiments, the cleaning device 70 includes a second vibrator 74, which is disposed in the cleaning tank 72. The second vibrator 74 may include, but is not limited to, an ultrasonic vibrator and the like. It is understood that the first vibrator 25 can generate vibrations in the cleaning tank 72, thereby driving the cleaning liquid to vibrate, and the vibration of the cleaning liquid can facilitate the cleaning liquid to more fully clean the current collector 2. Specifically, when the second vibrator 74 is an ultrasonic vibrator, the ultrasonic vibration also further improves the effect of the cleaning device 70 in cleaning impurities such as oil stains. Thus, vibrations can be generated in the cleaning tank 72 by the second vibrator 74, so that the current collector 2 is cleaned more fully.

[0070] Combination Figure 8-Figure 9 , Figure 8 is a schematic structural diagram of a glue-dispensing roller of a pole piece coating device according to one or more embodiments of the present application; Fig. 9 This is a fifth structural schematic diagram of a pole piece coating device according to one or more embodiments of the present application.

[0071] In some embodiments, the electrode coating device 1 includes a glue sticking device 80, which includes a glue putting roller 81, a glue collecting roller 82 and a glue sticking device 83. The impregnation device 20 is located between the glue putting roller 81 and the glue collecting roller 82 on the conveying path 11. The glue sticking device 83 is attached to a predetermined area on one side surface of the current collector 2 between the glue putting roller 81 and the glue collecting roller 82. The glue sticking device 83 is wound around the glue putting roller 81 and the glue collecting roller 82. The glue putting roller 81 and the glue collecting roller 82 rotate during the conveying of the current collector 2. It should be noted that the portion of the current collector 2 coated with the slurry to form a film layer can form the main body of the electrode, and one or both ends of the main body of the electrode need to form a pole ear, and the pole ear portion does not need to be coated with slurry and form a film layer. It is understandable that the glue sticking device 80 can stick the glue 83 on the predetermined area of ​​one side surface of the current collector 2 through the glue putting roller 81. When the glue 83 is stuck on the predetermined area of ​​the one side surface of the current collector 2, the glue 83 can isolate the predetermined area from the slurry, so that the predetermined area can avoid the slurry during the transportation of the current collector 2 along the conveying path 11, so as to facilitate the subsequent processing of the predetermined area to form the pole ear. The glue collecting roller 82 can recycle the glue 83 stuck on the predetermined area, thereby reducing the risk of the glue 83 remaining on the current collector 2. Specifically, before the current collector 2 is transported to the impregnation device 20, the glue putting roller 81 sticks the glue 83 on the predetermined area of ​​the current collector 2. After the current collector 2 passes through the impregnation device 20, the area without the glue 83 is evenly coated with the slurry, and the predetermined area is not coated with the slurry. After the current collector 2 leaves the impregnation device 20 and the slurry forms a film layer, the glue collecting roller 82 can recycle the glue 83 stuck on the predetermined area, thereby reducing the impact on subsequent processing. In some application scenarios, the preset area may include multiple sub-areas spaced from each other, and the adhesive 83 may be multiple paths, one path of adhesive 83 is set corresponding to one sub-area. For example, the preset area may include three sub-areas spaced from each other in the width direction of the current collector 2, and the adhesive roller 81 may be provided with three sub-areas spaced from each other, and one path of adhesive 83 is correspondingly set in one sub-area. Thus, the adhesive 83 can be applied to a predetermined area on one side of the surface of the current collector 2 by the adhesive roller 81, so that the predetermined area is isolated from the slurry by the adhesive 83, so that the slurry is difficult to adhere to the predetermined area of ​​the current collector 2, and the adhesive 83 is collected by the adhesive collection roller 82 after the current collector 2 is processed by the impregnation device 20, so as to help the predetermined area of ​​the current collector 2 to be exposed for subsequent processing, and the structure is simple and the degree of automation is high.

[0072] In some embodiments, the number of the glue sticking devices 80 is two groups, and the glue sticking 83 of the two groups of glue sticking devices 80 are respectively applied to the predetermined areas on the two side surfaces of the current collector 2 between the glue putting roller 81 and the glue collecting roller 82. It can be understood that the two groups of glue sticking devices 80 can apply the glue sticking 83 to the predetermined areas on the two side surfaces of the current collector 2, so as to form areas on the two side surfaces that are not coated with slurry, so as to form the pole ears in the subsequent processing. In some application scenarios, the predetermined areas on the opposite side surfaces of the current collector 2 are correspondingly arranged. Thereby, the predetermined areas on the two side surfaces of the current collector 2 are exposed for subsequent processing.

[0073] Combination Fig.10 , Fig.10 This is the sixth structural schematic diagram of the electrode coating equipment according to one or more embodiments of the present application.

[0074] In some embodiments, the conveying device 10 includes an unwinding assembly 12 and a winding assembly 13 for forming a conveying path 11, wherein the unwinding assembly 12 unwinds the current collector 2, and the winding assembly 13 winds up the current collector 2. The unwinding assembly 12 may include but is not limited to a driving member and an unwinding drum, wherein the driving member may be a motor, etc., and the driving member may drive the unwinding drum 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 drum, wherein the driving member may be a motor, etc., and the driving member may drive the winding drum to rotate to collect the current collector 2. The unwinding assembly 12 and the winding assembly 13 cooperate with each other to form a conveying path 11, thereby stably conveying 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, thereby reducing the shaking and deformation of the current collector 2, improving the conveying efficiency and stability of the current collector 2, and improving the degree of automation of the electrode coating device 1.

[0075] In some embodiments, the conveying device 10 further includes a deviation correction component 14, which is located between the unwinding component 12 and the winding component 13 on the conveying path 11, and the deviation correction component 14 is used to detect the position of the current collector 2. Exemplarily, the deviation correction component 14 may include two ultrasonic sensors, which are respectively arranged on both sides of the width direction of the current collector 2, and 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 correction component 14, which alleviates the risk of the current collector 2 being offset during the transmission process, and improves the transportation stability and reliability of the current collector 2.

[0076] In summary, the electrode coating device 1 provided in the present application includes a conveying device 10 and an impregnation device 20, wherein the conveying device 10 is used to convey the current collector 2 along the conveying path 11; the impregnation device 20 is located on the conveying path 11, and the impregnation device 20 includes a slurry tank 21, an impregnation member 22 and a scraper member 23, wherein the slurry tank 21 is used to store the slurry, the impregnation member 22 is used to hold the current collector 2 in the slurry tank 21 to impregnate the slurry in the slurry tank 21, and the scraper member 23 is used to scrape part of the slurry on the current collector 2 during the conveying process 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 impregnation member 22 holds the current collector 2 in the slurry tank 21 so that the current collector 2 is impregnated with the slurry, thereby facilitating the slurry to be fully coated on the current collector 2, thereby forming a film layer, and improving the coating efficiency, and the scraper member 23 further scrapes part of the slurry on the current collector 2, so that the slurry coating after scraping is more uniform, which is convenient for controlling the coating thickness of the slurry and improving the coating effect. Compared with other types of electrode coating equipment, the electrode coating equipment 1 of the present application has a higher efficiency in coating the film layer and a more uniform coating effect.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A 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; The impregnation device is located on the conveying path, and the impregnation device includes a slurry tank, an impregnation member and a scraper. The slurry tank is used to store slurry, the impregnation member is used to hold the collector into the slurry tank to impregnate the slurry in the slurry tank, and the scraper is used to scrape part of the slurry on the collector during the conveying of the collector.

2. The pole piece coating equipment according to claim 1, characterized in that: The wetting member includes a first wetting roller, and the scraper member includes a first scraper blade and a second scraper blade. The first position of the first wetting roller is used to hold the current collector into the slurry tank to wet the slurry in the slurry tank. The first scraper blade is used to contact the first surface of the current collector, and the second scraper blade is used to contact the 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, 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 2, characterized in that: The wetting member includes a second wetting roller, which is located downstream of the first wetting roller on the conveying path, and the first surface of the current collector abuts against a fourth position of the second wetting roller to allow the current collector to soak the slurry in the slurry tank.

5. The pole piece coating equipment according to claim 4, characterized in that: 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 fourth position and the fifth position at least partially overlap in the gravity direction.

6. The pole piece coating equipment according to claim 4, 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.

7. The pole piece coating equipment according to claim 4, characterized in that: The first wetting roller and / or the second wetting roller are movable in the direction of gravity.

8. The pole piece coating equipment according to claim 4, 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.

9. 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.

10. The electrode 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.

11. The pole piece coating equipment according to claim 10, 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.

12. The pole piece 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.

13. The pole piece coating equipment according to claim 12, 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.

14. The pole piece coating equipment according to claim 13, 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.

15. The pole piece coating equipment according to claim 14, 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.

16. The pole piece 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.

17. The pole piece coating equipment according to claim 16, 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.

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

19. 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.

20. The pole piece coating equipment according to claim 19, 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.

21. The electrode coating device according to any one of claims 1 to 20, 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.

22. The pole piece coating equipment according to claim 21, 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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