Coating equipment

Abstract

The utility model discloses a coating device. The coating equipment comprises a conveying device, a coating device and a base material separating device, the conveying device is used for conveying a current collector along a conveying path, the current collector comprises a first surface and a second surface which are arranged oppositely, the current collector is provided with a through hole penetrating through the first surface and the second surface, and a hole blocking base material for blocking the through hole is attached to the first surface; the coating device is located on the conveying path and used for applying slurry to the second surface so as to allow the slurry to fill the through hole; the base material separating device is located on the downstream of the coating device on the conveying path and used for separating the hole blocking base material and the current collector. Therefore, pollution and the like caused by the fact that slurry flows into the first surface are improved, the slurry can be limited in the through hole through the hole blocking base material so as to fill the through hole, the hole blocking base material and the current collector can be separated through the base material separation device, the separation difficulty of the hole blocking base material and the current collector is reduced, and the production efficiency of the battery pole piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a coating device. Background Art

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

[0003] A battery device includes one or more battery cells. One or more electrode assemblies are disposed inside the battery cell. The electrode assembly can be formed by winding or stacking electrode sheets. The electrode sheet 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 needs to be solved urgently. Summary of the Utility Model

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

[0005] To solve the above problems, the present application provides a coating device. The coating device includes a conveying device, a coating device, and a substrate separating device. The conveying device is used to convey a current collector along a conveying path. Wherein, the current collector includes a first surface and a second surface disposed opposite to each other. The current collector is provided with a through hole penetrating the first surface and the second surface. A hole-blocking substrate for blocking the through hole is attached to the first surface; the coating device is located on the conveying path, and the coating device is used to apply a slurry to the second surface to allow the slurry to fill the through hole; the substrate separating device is located downstream of the coating device on the conveying path, and the substrate separating device is used to separate the hole-blocking substrate and the current collector. Thus, a hole-blocking substrate is attached to the first surface of the current collector to block the through hole, which can prevent the slurry from entering the first surface through the through hole by the blocking substrate after the coating device applies the slurry to the second surface, improving problems such as pollution caused by the slurry flowing into the first surface, and can also limit the slurry in the through hole by the hole-blocking substrate to facilitate filling the through hole. After the slurry application operation is completed, the hole-blocking substrate and the current collector can be further separated by the substrate separating device, reducing the separation difficulty between the hole-blocking substrate and the current collector and improving the production efficiency of battery electrode sheets.

[0006] In some embodiments, the coating device includes a vibration device, the vibration device is located between the substrate detaching device and the coating device on the conveying path, and the vibration device is used to apply vibration to the current collector. Thus, the vibration device is located between the substrate detaching device and the coating device on the conveying path, and the vibration device is used to apply vibration to the current collector, so that the efficiency of the slurry filling into the through hole can be improved.

[0007] In some embodiments, the vibration device includes a vibration rod, the vibration rod is located on the side of the plugging substrate away from the current collector, and the vibration rod is used to apply vibration to the plugging substrate. Thus, by applying vibration to the plugging substrate through the vibration rod, the efficiency of slurry filling into the through hole can be improved in a simple vibration manner, thereby reducing the overall manufacturing cost of the coating equipment.

[0008] In some embodiments, the vibration device includes an ultrasonic vibrator, and the ultrasonic vibrator is used to apply vibration to the current collector. Thus, by applying vibration to the current collector by the ultrasonic vibrator, the efficiency of slurry filling into the through hole can be improved through efficient and high-quality vibration, thereby improving the production efficiency of the battery pole piece.

[0009] In some embodiments, the coating device includes a drying device, the drying device is located downstream of the coating device on the conveying path, and the drying device is used to dry the slurry. Thus, the drying device is located downstream of the coating device on the conveying path, so that the slurry is dried by the drying device so that the slurry in the through hole is fixed in the through hole.

[0010] In some embodiments, the substrate detaching device includes a substrate winding roller, and the substrate winding roller is used to wind up the plugging substrate. Thus, the plugging substrate is wound up by the substrate winding roller, so as to separate the plugging substrate and the current collector in a simple manner, reduce the difficulty of separating the plugging substrate and the current collector, and improve the production efficiency of the battery pole piece.

[0011] In some embodiments, the coating device includes a substrate supply device, the substrate supply device is located upstream of the coating device on the conveying path, and the substrate supply device is used to unwind the plugging substrate so that the plugging substrate is attached to the first surface. Therefore, the substrate supply device is located upstream of the coating device on the conveying path, which facilitates the substrate supply device to unwind the plugging substrate so that the plugging substrate is attached to the first surface, thereby improving the bonding efficiency of the plugging substrate. This in turn improves the production efficiency of the battery electrode.

[0012] In some embodiments, the conveying device includes a stretching roller, the stretching roller is spaced apart from the coating device, and the stretching roller is used to hold the side of the pore-blocking substrate away from the current collector so that the second surface faces the coating device. Thus, the stretching roller is used to hold the side of the pore-blocking substrate away from the current collector so that the second surface faces the coating device, so that the coating device can apply the slurry to the second surface.

[0013] In some embodiments, the conveying device includes a coating roller, the coating roller is located upstream of the coating device on the conveying path, and the coating roller is used to stretch the current collector. Thus, the current collector is stretched by the coating roller, the flatness of the second surface of the current collector is improved, and it is convenient for the coating device to apply the slurry to the second surface.

[0014] In some embodiments, the number of the coating rollers is multiple, and the multiple coating rollers are sequentially arranged at intervals along the conveying path, and the current collector passes through each of the coating rollers in turn. Thus, the flatness of the second surface of the current collector can be further improved by cooperating with the multiple coating rollers to jointly stretch the current collector.

[0015] In some embodiments, the coating device includes a substrate supply device, the substrate supply device is located upstream of the coating device on the conveying path, the conveying device includes a mounting bracket, and the coating roller and the substrate supply device are both fixedly connected to the mounting bracket. Thus, the coating roller and the substrate supply device share the mounting bracket, reducing the overall size of the coating device and making it easier to attach the hole-blocking substrate to the first surface through the substrate supply device.

[0016] In some embodiments, the conveying device includes a pole piece unwinding roller and a pole piece winding roller, the pole piece unwinding roller is located at the starting end of the conveying path, the pole piece winding roller is located at the terminating end of the conveying path, the pole piece unwinding roller is used to unwind the current collector, and the pole piece winding roller is used to wind up the current collector. Thus, it is convenient to unwind the current collector through the pole piece unwinding roller, and it is convenient to wind up the current collector through the pole piece winding roller, thereby improving the automation degree of the coating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a first structural schematic diagram of a coating device according to one or more embodiments of the present application;

[0019] Figure 2 is a schematic structural view of a current collector according to one or more embodiments of the present application;

[0020] Figure 3 is a second schematic structural view of a coating device according to one or more embodiments of the present application;

[0021] Figure 4 is Figure 3 a schematic side view structural view of the coating device shown;

[0022] Figure 5 is Figure 3 an enlarged structural view within the dashed box of the coating device shown.

[0023] Reference numerals in the drawings: coating device 10; conveying device 100; electrode sheet unwinding roller 110; electrode sheet winding roller 120; stretching roller 130; coating roller 140; mounting bracket 150; coating device 200; substrate separating device 300; substrate winding roller 310; current collector 400; first surface 410; second surface 420; through hole 430; slurry 440; hole-blocking substrate 500; vibrating device 600; vibrating rod 610; ultrasonic vibrator 620; drying device 700; substrate supply device 800; conveying path X. Detailed Embodiments

[0024] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0027] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase 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.

[0028] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0029] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0030] 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 cannot be understood as a limitation on the embodiments of the present application.

[0031] 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.

[0032] 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 hydropower, thermal power, wind power, and solar power plants, 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 battery application field, the market demand is also continuously increasing.

[0033] Batteries mentioned in this field can be divided into primary batteries and rechargeable batteries according to whether they are rechargeable. Primary batteries are also known as "throwaway" batteries and galvanic cells. Since their power is exhausted, they cannot be recharged and used again and can only be discarded. Rechargeable batteries are also known as secondary batteries or accumulators. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Their advantage is that they can be recycled multiple times after charging. The output current load capacity of rechargeable batteries is higher than that of most primary batteries. Currently, the common types of rechargeable batteries are: lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, etc., and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively slightly lower, but they have a large output and charging current, as well as a long service life, but the cost is high.

[0034] The batteries described in the embodiments of this application refer to rechargeable batteries or primary batteries. Hereinafter, the embodiments disclosed in this application will be mainly described by taking lithium-ion batteries as an example. It should be understood that the embodiments disclosed in this application are applicable to any other suitable type of rechargeable battery. The batteries mentioned in the embodiments disclosed in this application can be directly or indirectly applied to a suitable device to power the device.

[0035] The battery device may include a box body and battery cells, and the battery cells are accommodated in the box body. The box body is used to provide an accommodation space for the battery cells, and the box body can adopt various structures. In some embodiments, the box body may include a first part and a second part, the first part and the second part are covered with each other, and the first part and the second part jointly define an accommodation space for accommodating the battery cells. The second part may be a hollow structure with one end open, and the first part may be a plate-like structure. The first part covers the open side of the second part so that the first part and the second part jointly define an accommodation space; the first part and the second part may also both be hollow structures with one side open, and the open side of the first part covers the open side of the second part.

[0036] In a battery device, there can be multiple battery cells. The multiple battery cells can be connected in series, parallel, or a combination of both (mixed connection). A mixed connection means that among the multiple battery cells, there are both series and parallel connections. The multiple battery cells can be directly connected in series, parallel, or in a mixed manner and then the whole formed by the multiple battery cells is accommodated in a box. Of course, the battery device can also be such that multiple battery cells are first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole and are accommodated in a box. The battery device can also include other structures. For example, the battery device can also include a busbar component for realizing the electrical connection between multiple battery cells.

[0037] 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. However, in order to improve the accuracy, the requirement for the mold accuracy is extremely high, the equipment investment is high, and the process is relatively complex, resulting in low production efficiency. Wound batteries are simple to manufacture. The requirements for the equipment accuracy in the processes of making the electrode plates and assembling are generally low, the production efficiency is high, and the cost is low. 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.

[0038] A battery cell refers to the smallest unit that makes up a battery device. A battery cell can 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 can 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 usually an insulator is provided between the positive electrode plate and the negative electrode plate.

[0039] The electrode plate can 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 charging and discharging 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 can include a current collector and an active material provided 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 then the film layer can be fixed on the current collector by means such as baking and rolling. Among them, the material of the slurry can include but is not limited to lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds, artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0040] However, how to coat the active material layer on the current collector has become a technical problem that urgently needs to be solved.

[0041] To solve the technical problems existing in the related art, the present application provides a coating device. The conveying device of the coating device is used to convey a current collector. The current collector has through holes penetrating both side surfaces. A hole-blocking substrate is attached to one side surface of the current collector, and the through holes are blocked by the hole-blocking substrate. After applying the slurry to the surface of the current collector where the hole-blocking substrate is not attached, the slurry can fill the through holes, and after the operation is completed, the hole-blocking substrate and the current collector are separated, so as to obtain a current collector with the through holes filled with the slurry.

[0042] Specifically, referring to Figure 1 and Figure 2 , Figure 1 is a first schematic structural view of a coating device according to one or more embodiments of the present application, Figure 2 is a schematic structural view of a current collector according to one or more embodiments of the present application.

[0043] The coating device 10 includes a conveying device 100, a coating device 200, and a substrate separating device 300. The conveying device 100 is used to convey the current collector 400 along a conveying path X. Among them, the current collector 400 includes a first surface 410 and a second surface 420 arranged opposite to each other. The current collector 400 is provided with a through hole 430 penetrating the first surface 410 and the second surface 420. A hole-blocking substrate 500 for blocking the through hole 430 is attached to the first surface 410. The coating device 200 is located on the conveying path X, and the coating device 200 is used to apply a slurry 440 to the second surface 420 to allow the slurry 440 to fill the through hole 430. The substrate separating device 300 is located downstream of the coating device 200 on the conveying path X, and the substrate separating device 300 is used to separate the hole-blocking substrate 500 and the current collector 400.

[0044] The current collector 400 may include, but is not limited to, a metal foil or a composite current collector 400. 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 400 may include a polymer material base layer and a metal layer. The composite current collector 400 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.). The current collector 400 has opposite first surface 410 and second surface 420 in its thickness direction, and the through holes 430 penetrate through the first surface 410 and the second surface 420. The number of the through holes 430 may be multiple, and the multiple through holes 430 are arranged at intervals. Among them, the size of the through holes 430 and the spacing between the multiple through holes 430 may be set according to the actual situation. The material of the hole-blocking substrate 500 may be set according to the actual situation. For example, the hole-blocking substrate 500 may be a high-temperature resistant substrate or a substrate that is easily melted by high temperature, etc. The hole-blocking substrate 500 may be in the shape of a thin film, and the hole-blocking substrate 500 may be attached to the first surface 410 of the current collector 400, so that the hole-blocking substrate 500 can block the through holes 430 from the first surface 410. For example, the hole-blocking substrate 500 may have adhesiveness, and the hole-blocking substrate 500 may be adhered to the first surface 410 through its own adhesiveness.

[0045] The coating device 200 can be used to apply the slurry 440 to the current collector 400. For example, the coating device 200 may include, but is not limited to, a slot coating device 200 or a spin coater, etc. The coating device 200 may be connected to a slurry supply device, and the slurry supply device provides the slurry 440 to the coating device 200, so as to facilitate the coating device 200 to apply the slurry 440 to the current collector 400. As an example, the slurry 440 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 the positive electrode active material of the battery may also be used. These positive electrode active materials may 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.

[0046] The substrate detachment device 300 may include, but is not limited to, a heating device or a winding roller, etc. For example, the substrate detachment device 300 can be connected to the plugged-hole substrate 500, and corresponding operations can be performed through the substrate detachment device 300, so that the plugged-hole substrate 500 is connected to the substrate detachment device 300 and gradually separated from the current collector 400. Another example is that the melting point of the plugged-hole substrate 500 can be lower than that of the current collector 400 and the slurry 440. The substrate detachment device 300 can heat-treat the current collector 400 and the plugged-hole substrate 500, causing the plugged-hole substrate 500 to melt, and then separating from the current collector 400 under the action of its own gravity or with the assistance of other devices after melting.

[0047] In this embodiment, the conveying device 100 can convey the current collector 400 along the conveying path X, and make the second surface 420 of the current collector 400 passing through the coating device 200 face the coating device 200. During the process of the conveying device 100 conveying the current collector 400, the coating device 200 continuously applies the slurry 440 to the second surface 420 of the current collector 400, so that the slurry 440 enters the through-holes 430 and is restricted in the through-holes 430 by the plugged-hole substrate 500. After operations such as the application of the slurry 440 and the fixation of the slurry 440 are completed, the substrate detachment device 300 separates the plugged-hole substrate 500 and the current collector 400, and finally obtains the current collector 400 with the through-holes 430 filled with the slurry 440.

[0048] Through the above implementation method, the plugged-hole substrate 500 is attached to the first surface 410 of the current collector 400 to block the through-holes 430. After the coating device 200 applies the slurry 440 to the second surface 420, the blocked substrate can prevent the slurry 440 from entering the first surface 410 from the through-holes 430, improving problems such as contamination caused by the slurry 440 flowing into the first surface 410. Moreover, the plugged-hole substrate 500 can also restrict the slurry 440 in the through-holes 430 to facilitate the filling of the through-holes 430. After the operation of applying the slurry 440 is completed, the substrate detachment device 300 can further separate the plugged-hole substrate 500 and the current collector 400, reducing the separation difficulty between the plugged-hole substrate 500 and the current collector 400 and improving the production efficiency of the battery electrode sheet.

[0049] Further, the conveying device 100 includes a pole piece unwinding roller 110 and a pole piece winding roller 120. The pole piece unwinding roller 110 is located at the starting end of the conveying path X, and the pole piece winding roller 120 is located at the terminating end of the conveying path X. The pole piece unwinding roller 110 is used for unwinding the current collector 400, and the pole piece winding roller 120 is used for winding the current collector 400. The pole piece unwinding roller 110 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 400. The pole piece unwinding roller 110 is located at the starting end of the conveying path X so as to facilitate the pole piece unwinding roller 110 to provide the current collector 400 without the coated slurry 440. The pole piece unwinding roller 110 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 collect the current collector 400. The pole piece winding roller 120 is located at the terminating end of the conveying path X so as to facilitate the pole piece winding roller 120 to wind the current collector 400 coated with the slurry 440 and processed with the slurry 440. Thus, it is convenient to unwind the current collector 400 through the pole piece unwinding roller 110 and to wind the current collector 400 through the pole piece winding roller 120, improving the automation degree of the coating device 10.

[0050] See Figures 3 to 5 , Figure 3 is a second structural schematic diagram of the coating device 10 according to one or more embodiments of the present application. Figure 4 is Figure 3 a side view structural schematic diagram of the shown coating device 10. Figure 5 is Figure 3 an enlarged structural schematic diagram within the dashed box of the shown coating device 10.

[0051] The coating device 10 includes a vibration device 600. The vibration device 600 is located between the substrate detachment device 300 and the coating device 200 on the conveying path X, and the vibration device 600 is used to apply vibration to the current collector 400. The form type of the vibration device 600 can be set according to the actual situation. The vibration device 600 is located between the substrate detachment device 300 and the coating device 200 on the conveying path X, so that the current collector 400 coated with the slurry 440 can pass through the vibration device 600 first, and then the vibration device 600 applies vibration to the current collector 400. Furthermore, at least part of the slurry 440 on the second surface 420 can flow into the through holes 430 under the action of the vibration of the vibration device 600, and the slurry 440 in the through holes 430 can release air bubbles and the like under the action of the vibration. Among them, the current collector 400 coated with the slurry 440 can move horizontally to the vibration device 600, so that the slurry 440 can still stay in the through holes 430 during the vibration process. Thus, the vibration device 600 is located between the substrate detachment device 300 and the coating device 200 on the conveying path X. By applying vibration to the current collector 400 through the vibration device 600, the efficiency of filling the slurry 440 into the through holes 430 can be improved.

[0052] Furthermore, the vibration device 600 includes a vibration rod 610. The vibration rod 610 is located on the side of the hole-blocking substrate 500 facing away from the current collector 400, and the vibration rod 610 is used to apply vibration to the hole-blocking substrate 500. The current collector 400 coated with the slurry 440 can move horizontally to the vibration rod 610, causing the current collector 400, the hole-blocking substrate 500, and the vibration rod 610 to be arranged along the gravity direction. The vibration rod 610 can be fixedly connected to the driving motor, and the vibration rod 610 can move up and down along the gravity direction under the action of the driving motor to apply vibration to the hole-blocking substrate 500. Or the vibration rod 610 can be an eccentric rod. The vibration rod 610 can rotate along the rotation axis, and the rotation axis deviates from the central axis of the vibration rod 610, so that the vibration rod 610 applies vibration to the hole-blocking substrate 500 during the rotation process. Thus, by applying vibration to the hole-blocking substrate 500 through the vibration rod 610, the efficiency of filling the slurry 440 into the through holes 430 can be improved in a simple vibration manner, and further the overall manufacturing cost of the coating device 10 can be reduced.

[0053] Optionally, the vibration device 600 includes an ultrasonic vibrator 620 for applying vibration to the current collector 400. The ultrasonic vibrator 620 may include a housing, and the current collector 400 passes through the housing of the ultrasonic vibrator 620 during its movement along the conveying path X. The ultrasonic vibrator 620 emits ultrasonic waves to vibrate a part of the current collector 400 located inside the housing of the ultrasonic vibrator 620, and the vibration frequency of the ultrasonic vibrator 620 can be set according to the actual situation. Thus, by applying vibration to the current collector 400 through the ultrasonic vibrator 620, the efficiency of filling the slurry 440 into the through holes 430 can be improved by an efficient and high-quality vibration method, thereby improving the production efficiency of the battery electrode sheet.

[0054] In some embodiments of the present application, the vibration device 600 may simultaneously include an ultrasonic vibrator 620 and a vibrating rod 610. Both the ultrasonic vibrator 620 and the vibrating rod 610 are located on the conveying path X. Exemplarily, in the Figure 3 illustrated embodiment, the ultrasonic vibrator 620 may be located downstream of the vibrating rod 610 on the conveying path X, so that the current collector 400 is first preliminarily vibrated by the vibrating rod 610 and then secondarily vibrated by the ultrasonic vibrator 620.

[0055] In some embodiments, the coating device 10 includes a drying device 700. The drying device 700 is located downstream of the coating device 200 on the conveying path X and is used to dry the slurry 440. The drying device 700 can heat and dry the slurry 440 on the current collector 400. It can be understood that the slurry 440 can be cured to form a stable structure after heating and drying. In some application scenarios, the drying device 700 may include a heat-insulating box body, which has an inlet and an outlet communicating the inside and the outside of the box body. The current collector 400 can enter and exit the heat-insulating box body through the inlet and the outlet. A heating plate is arranged inside the heat-insulating box body, which can be used to heat the current collector 400. A heat dissipation window and a fan may also be provided on the heat-insulating box body to facilitate improving the temperature stability inside the heat-insulating box body. Among them, when the coating device 10 has a vibration device 600, the drying device 700 may be located downstream of the vibration device 600 on the conveying path X, so that the vibrated current collector 400 enters the drying device 700 along the conveying path X. Further, the drying device 700 may also be provided with a temperature sensor to monitor the temperature condition of the drying device 700. Thus, the drying device 700 is located downstream of the coating device 200 on the conveying path X, which is convenient for drying the slurry 440 through the drying device 700 so that the slurry 440 in the through holes 430 is shaped in the through holes 430.

[0056] In some embodiments, the substrate detachment device 300 includes a substrate winding roller 310 for winding the hole-blocking substrate 500. The substrate winding roller 310 can be located downstream of the coating device 200 on the conveying path X. Exemplarily, when the coating equipment 10 includes a drying device 700, the substrate winding roller 310 can be located downstream of the drying device 700 on the conveying path X. The substrate winding roller 310 can rotate during the movement of the current collector 400 to wind the hole-blocking substrate 500 during the rotation of the substrate winding roller 310, thereby separating the substrate winding roller 310 from the current collector 400. Among them, when the coating equipment 10 further includes a pole piece winding roller 120, the substrate winding roller 310 and the pole piece winding roller 120 are adjacent, and the substrate winding roller 310 and the pole piece winding roller 120 rotate synchronously, so that the substrate winding roller 310 winds the hole-blocking substrate 500 and the pole piece winding roller 120 winds the current collector 400, making it easier to separate the current collector 400 from the hole-blocking substrate 500. Thus, by winding the hole-blocking substrate 500 with the substrate winding roller 310, it is convenient to separate the hole-blocking substrate 500 and the current collector 400 in a simple manner, reduce the separation difficulty between the hole-blocking substrate 500 and the current collector 400, and improve the production efficiency of battery pole pieces.

[0057] In some other embodiments, the substrate detachment device 300 may include a heating device. The heating device can be located downstream of the coating device 200 on the conveying path X. The heating device can be used to heat-treat the hole-blocking substrate 500. The melting point of the hole-blocking substrate 500 can be lower than that of the current collector 400 and the slurry 440. The current collector 400 and the hole-blocking substrate 500 can be heat-treated by the heating device, so that the hole-blocking substrate 500 melts, and then the melted hole-blocking substrate 500 separates from the current collector 400 under its own gravity or with the assistance of other devices. Among them, the heating device can be integrally arranged with the drying device 700 of the coating equipment 10, that is, the hole-blocking substrate 500 can be heat-treated by the drying device 700, so that the hole-blocking substrate 500 melts.

[0058] In some embodiments, the coating device 10 includes a substrate supply device 800. The substrate supply device 800 is located upstream of the coating device 200 on the conveying path X. The substrate supply device 800 is configured to unwind the hole-blocking substrate 500 so that the hole-blocking substrate 500 adheres to the first surface 410. The substrate supply device 800 can be in the shape of a roller. The substrate supply device 800 can be wound with the hole-blocking substrate 500. The substrate supply device 800 is located on the conveying path X. During the process of the conveying device 100 conveying the current collector 400, the substrate supply device 800 provides the hole-blocking substrate 500 and makes the hole-blocking substrate 500 adhere to the first surface 410. Then, the conveying device 100 drives the hole-blocking substrate 500 and the current collector 400 together to the coating device 200. Thus, the substrate supply device 800 is located upstream of the coating device 200 on the conveying path X, which facilitates the substrate supply device 800 to unwind the hole-blocking substrate 500 so that the hole-blocking substrate 500 adheres to the first surface 410, improving the adhesion efficiency of the hole-blocking substrate 500. Furthermore, the production efficiency of the battery electrode sheet is improved. In some other embodiments, the current collector 400 and the hole-blocking substrate 500 can be continuously in an adhered state and are jointly wound on the electrode unwinding roller 110.

[0059] In some embodiments, the conveying device 100 includes a stretching roller 130. The stretching roller 130 is spaced from the coating device 200. The stretching roller 130 is configured to abut against the side of the hole-blocking substrate 500 facing away from the current collector 400 so that the second surface 420 faces the coating device 200. The stretching roller 130 can be opposite to and spaced from the coating device 200. The stretching roller 130 is located on the conveying path X. The stretching roller 130 abuts against the side of the hole-blocking substrate 500 facing away from the current collector 400 to stretch the current collector 400. Then, the second surface 420 of the current collector 400 is in a flatter state, which is beneficial for the coating device 200 to coat the slurry 440 on the second surface 420. Among them, the stretching roller 130 can rotate around its own central axis, thereby reducing the relative friction between the stretching roller 130 and the hole-blocking substrate 500 to damage the hole-blocking substrate 500. Thus, the stretching roller 130 is configured to abut against the side of the hole-blocking substrate 500 facing away from the current collector 400 so that the second surface 420 faces the coating device 200, facilitating the coating device 200 to apply the slurry 440 to the second surface 420.

[0060] In some embodiments, the conveying device 100 includes a coating roller 140. The coating roller 140 is located upstream of the coating device 200 on the conveying path X. The coating roller 140 is configured to stretch the current collector 400. The coating roller 140 can be on the conveying path X. The coating roller 140 can rotate around its own axis. The coating roller 140 can abut against the current collector 400. The current collector 400 can be stretched by the coating roller 140, further improving the flatness of the second surface 420 of the current collector 400 and facilitating the coating device 200 to apply the slurry 440 to the second surface 420.

[0061] Furthermore, the number of the coating rollers 140 is plural, and the plural coating rollers 140 are sequentially arranged at intervals along the conveying path X. The current collector 400 sequentially passes through each coating roller 140. The plural coating rollers 140 can cooperate with each other to jointly stretch the current collector 400, which can further improve the flatness of the second surface 420 of the current collector 400. As Figure 5 shown, the number of the coating rollers 140 can be three. All the three coating rollers 140 are located upstream of the stretching roller 130 on the conveying path X. On the conveying path X, the second coating roller 140 is obliquely above the first coating roller 140 in the direction of gravity, and the third coating roller 140 is directly above the second coating roller 140 in the direction of gravity.

[0062] Furthermore, the coating device 10 includes a base material supply device 800. The base material supply device 800 is located upstream of the coating device 200 on the conveying path X. The conveying device 100 includes a mounting bracket 150. Both the coating roller 140 and the base material supply device 800 are fixedly connected to the mounting bracket 150. The base material supply device 800 can be in a roller shape. The base material supply device 800 can be wound with a hole-blocking base material 500. The base material supply device 800 is located on the conveying path X. During the process of the conveying device 100 conveying the current collector 400, the base material supply device 800 provides the hole-blocking base material 500 and makes the hole-blocking base material 500 adhere to the first surface 410, so that the conveying device 100 drives the hole-blocking base material 500 and the current collector 400 to the coating device 200 together. The mounting bracket 150 can be in a U shape. The coating roller 140 can be bridged between two opposite vertical plates of the mounting bracket 150. The base material supply device 800 can be installed on the mounting bracket 150 and is arranged at an interval from the coating roller 140. Thus, the coating roller 140 and the base material supply device 800 share the mounting bracket 150, reducing the overall size of the coating device 10 and facilitating the attachment of the hole-blocking base material 500 to the first surface 410 through the base material supply device 800.

[0063] In summary, the hole-blocking base material 500 is attached to the first surface 410 of the current collector 400 to block the through holes 430. After the coating device 200 applies the slurry 440 to the second surface 420, the hole-blocking base material can block the slurry 440 from entering the first surface 410 through the through holes 430, improving problems such as pollution caused by the slurry 440 flowing into the first surface 410. Moreover, the slurry 440 can be restricted in the through holes 430 by the hole-blocking base material 500 to facilitate the filling of the through holes 430. After the operation of applying the slurry 440 is completed, the hole-blocking base material 500 and the current collector 400 can be further separated by the base material separating device 300, reducing the separation difficulty between the hole-blocking base material 500 and the current collector 400 and improving the production efficiency of the battery electrode sheet.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating device, characterized in that: The coating equipment comprises: A conveying device, used for conveying a current collector along a conveying path, wherein the current collector comprises a first surface and a second surface disposed opposite to each other, the current collector is provided with a through hole penetrating the first surface and the second surface, and the first surface is provided with a hole-blocking substrate for blocking the through hole; a coating device, located on the conveying path, the coating device being used to apply slurry to the second surface to allow the slurry to fill the through hole; A substrate separation device is located downstream of the coating device on the conveying path, and the substrate separation device is used to separate the pore-blocking substrate and the current collector.

2. The coating device according to claim 1, characterized in that: The coating apparatus includes a vibration device, which is located between the substrate detaching device and the coating device on the conveying path, and the vibration device is used to apply vibration to the current collector.

3. The coating device according to claim 2, characterized in that: The vibration device comprises a vibration rod, the vibration rod is located at a side of the pore-plugging substrate away from the current collector, and the vibration rod is used to apply vibration to the pore-plugging substrate.

4. The coating device according to claim 2, characterized in that: The vibration device includes an ultrasonic vibrator for applying vibration to the current collector.

5. The coating device according to any one of claims 1 to 4, characterized in that: The coating device comprises a drying device, which is located downstream of the coating device on the conveying path and is used for drying the slurry.

6. The coating device according to any one of claims 1 to 4, characterized in that: The substrate detaching device comprises a substrate winding roller, and the substrate winding roller is used for winding up the hole-blocking substrate.

7. The coating device according to any one of claims 1 to 4, characterized in that: The coating device includes a substrate supply device, which is located upstream of the coating device on the conveying path, and is used for unwinding the hole-plugging substrate so that the hole-plugging substrate is attached to the first surface.

8. The coating device according to any one of claims 1 to 4, characterized in that: The conveying device comprises a stretching roller, the stretching roller is spaced apart from the coating device, and the stretching roller is used to hold the side of the pore-blocking substrate away from the current collector so that the second surface faces the coating device.

9. The coating device according to any one of claims 1 to 4, characterized in that: The conveying device comprises a coating roller, the coating roller is located upstream of the coating device on the conveying path, and the coating roller is used to stretch the current collector.

10. The coating device according to claim 9, characterized in that: There are a plurality of coating rollers, and the plurality of coating rollers are sequentially arranged at intervals along the conveying path, and the current collector passes through each of the coating rollers sequentially.

11. The coating device according to claim 9, characterized in that: The coating device comprises a substrate supply device, which is located upstream of the coating device on the conveying path. The conveying device comprises a mounting bracket, and the coating roller and the substrate supply device are both fixedly connected to the mounting bracket.

12. The coating device according to claim 1, characterized in that: The conveying device includes a pole piece unwinding roller and a pole piece winding roller, the pole piece unwinding roller is located at the starting end of the conveying path, the pole piece winding roller is located at the ending end of the conveying path, the pole piece unwinding roller is used to unwind the current collector, and the pole piece winding roller is used to wind up the current collector.

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