Coating equipment and coating system

Abstract

The utility model discloses coating equipment and a coating system. The coating equipment comprises a coating die head and a slurry supply source, wherein a first discharge hole and a second discharge hole which are adjacent to each other are formed in the coating die head; the slurry supply source is connected with the coating die head, and slurry provided by the slurry supply source is coated on the main body area of the pole piece through the first discharge port and coated on the thinning area of the pole piece through the second discharge port. Therefore, the coating die head is provided with the first discharge port and the second discharge port, the slurry is coated on the main body area of the pole piece through the first discharge port, and the slurry is coated on the thinned area of the pole piece through the second discharge port, so that the slurry can be coated on the main body area and the thinned area through the same coating die head, and the working efficiency of slurry coating is improved; and the slurry in the thinning area is independently supplied by the second discharge port, so that the amount of the slurry coated in the thinning area can be accurately controlled through the second discharge port, and the yield of finished pole pieces is improved.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a coating device and a coating system. 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] During the production process of batteries, slurry needs to be coated on the electrode to form an active material layer. In the existing solution, the active material at the edge is mainly thinned by a thinning device to form a thinned area of ​​the electrode. However, this method is difficult to accurately control the thickness of the thinned area, resulting in problems such as reduced product quality. Utility Model Content

[0004] The main purpose of this application is to provide a coating device and a coating system, 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 coating device, which includes a coating die and a slurry supply source, wherein the coating die is formed with a first discharge port and a second discharge port which are adjacently arranged; the slurry supply source is connected to the coating die, and the slurry provided by the slurry supply source is coated on the main body area of ​​the pole piece via the first discharge port, and is coated on the thinning area of ​​the pole piece via the second discharge port. Thus, the coating die has a first discharge port and a second discharge port, the slurry is coated on the main body area of ​​the pole piece via the first discharge port, and the slurry is coated on the thinning area of ​​the pole piece via the second discharge port, and the slurry can be coated on the main body area and the thinning area through the same coating die, thereby improving the working efficiency of the slurry coating, and the slurry in the thinning area is separately supplied by the second discharge port, and the amount of slurry coated on the thinning area can be accurately controlled through the second discharge port, thereby improving the yield of the finished pole piece.

[0006] In some embodiments, the number of the second outlets is two, and the first outlet is located between the two second outlets. Thus, the first outlet is located between the two second outlets, and the slurry can be applied to two thinning areas at the same time, thereby improving the working efficiency of the slurry coating.

[0007] In some embodiments, the coating device includes a delivery pipeline and an adjustment member, the delivery pipeline is connected to the second outlet and the slurry supply source through the adjustment member, and the adjustment member is used to adjust the slurry flow rate delivered to the second outlet. Therefore, by adjusting the slurry flow rate delivered to the second outlet through the adjustment member, the slurry amount at the second outlet can be more accurately controlled, and then the finished product thickness of the thinning area can be accurately controlled, thereby improving the finished product yield of the electrode piece.

[0008] In some embodiments, the coating device further comprises a controller, and the controller is used to control the regulating member to adjust the slurry flow rate delivered to the second discharge port. Thus, by controlling the regulating member to adjust the slurry flow rate delivered to the second discharge port by the controller, the slurry amount at the second discharge port can be further automatically and accurately controlled.

[0009] In some embodiments, the coating device further comprises a thickness detector for detecting the thickness of the skived area. Thus, by detecting the thickness of the skived area through the thickness detector, it is convenient to control the flow rate of the slurry delivered to the second discharge port by the regulating member according to the thickness detection result, and the thickness of the skived area can be automatically and accurately controlled online.

[0010] In some embodiments, the coating die includes a first die, a second die, and a gasket, the gasket is sandwiched between the first die and the second die, and the gasket is used to cooperate with at least one of the first die and the second die to form a first discharge port and a second discharge port. Thus, the first die, the second die, and the gasket cooperate to form the coating die, which can reduce the molding difficulty of the coating die, and at least one of the first die and the second die forms the first discharge port and the second discharge port, which can accurately control the size of the first discharge port and the second discharge port, and thus accurately control the amount of slurry in the first discharge port and the second discharge port.

[0011] In some embodiments, the gasket is provided with a slurry flow channel, one end of which is connected to the slurry supply source, and the other end of which cooperates with the first die head or the second die head to form a second discharge port. Thus, by forming the slurry flow channel on the gasket, it is convenient to flow the slurry output from the slurry supply source to the second discharge port through the slurry flow channel.

[0012] In some embodiments, the ratio of the depth of the slurry flow channel to the thickness of the gasket is greater than 0 and less than or equal to 80%. Thus, by limiting the depth of the slurry flow channel, it is convenient to accurately control the amount of slurry flowing out of the second outlet.

[0013] In some embodiments, at least one of the first die head and the second die head is provided with a drainage groove, and the drainage groove is used to guide the slurry to flow out of the first discharge port. Thus, at least one of the first die head and the second die head is provided with a drainage groove, which can facilitate the slurry output from the slurry supply source to flow to the first discharge port through the drainage groove.

[0014] In some embodiments, the slurry supply source includes a first supply source and a second supply source, the slurry provided by the first supply source is coated on the main area of ​​the pole piece through the first outlet, and the slurry provided by the second supply source is coated on the thinning area of ​​the pole piece through the second outlet. Thus, the first supply source provides slurry to the first outlet, and the second supply source provides material to the second outlet, which can further accurately control the amount of slurry at the second outlet, and then accurately control the finished product thickness of the thinning area, thereby improving the finished product yield of the pole piece.

[0015] To solve the above problems, the present application provides a coating system, which includes a pole piece and the above coating equipment. The pole piece includes a main area and a thinning area. The coating equipment is used to coat the slurry on the main area and the thinning area of ​​the pole piece.

[0016] In some embodiments, the ratio of the width of the second discharge port of the coating device to the width of the pole piece thinning area is greater than or equal to 10% and less than or equal to 1. Therefore, by limiting the width of the second discharge port, it is convenient to accurately control the amount of slurry flowing out of the second discharge port, thereby accurately controlling the thickness of the finished product in the thinning area and improving the finished product yield of the pole piece. 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 schematic diagram of an exploded structure of a battery cell according to one or more embodiments of the present application;

[0019] Figure 2 is a first structural schematic diagram of a pole piece according to one or more embodiments of the present application;

[0020] Figure 3 is a first structural schematic diagram of a coating system according to one or more embodiments of the present application;

[0021] Figure 4 is a second structural schematic diagram of a pole piece according to one or more embodiments of the present application;

[0022] Figure 5 is a schematic structural diagram of a coating die according to one or more embodiments of the present application;

[0023] Figure 6 is a schematic structural diagram of a coating die head and a pole piece according to one or more embodiments of the present application;

[0024] Figure 7is a second structural schematic diagram of a coating system according to one or more embodiments of the present application.

[0025] Reference numerals: end cap 10a; housing 10b; electrode assembly 10c;

[0026] Coating system 1; coating equipment 10; coating die 100; gasket 110; first discharge port 111; second discharge port 112; slurry flow channel 113; first die 120; second die 130; drainage groove 140; slurry supply source 200; delivery pipeline 300; adjustment member 400; controller 500; thickness detector 600; pole piece 20; main body area 21; thinning area 22. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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).

[0033] 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.

[0034] 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.

[0035] At present, judging from 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 stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0036] In some embodiments, the battery may include a housing and a battery cell, and the battery cell is contained in the housing. In the 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 both 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 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 may also include other structures. For example, the battery may also include a busbar component for realizing electrical connection between multiple battery cells.

[0037] 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.

[0038] See also Figure 1 , Figure 1 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments of the present application.

[0039] A battery cell refers to the smallest unit that constitutes a battery. The battery cell may include a housing, an electrode assembly 10c and other functional components, and the housing includes an end cap 10a and a shell 10b.

[0040] The end cap 10a refers to a component that covers the opening of the shell 10b to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap 10a can be adapted to the shape of the shell 10b to match the shell 10b. Optionally, the end cap 10a can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 10a is not easily deformed when squeezed and collided, so that the battery cell can have a higher structural strength and the safety performance can also be improved. The shell 10b is a component used to cooperate with the end cap 10a to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly 10c, electrolyte and other components. The shell 10b and the end cap 10a can be independent components, and an opening can be set on the shell 10b, and the internal environment of the battery cell is formed by covering the opening with the end cap 10a at the opening.

[0041] The electrode assembly 10c is a component in the battery cell where electrochemical reactions occur. The housing 10b may contain one or more electrode assemblies 10c. The electrode assembly 10c is mainly formed by winding or stacking a positive electrode sheet 20 and a negative electrode sheet 20, and a separator is usually provided between the positive electrode sheet 20 and the negative electrode sheet 20.

[0042] See also Figure 2 , Figure 2 is a first structural schematic diagram of a pole piece 20 according to one or more embodiments of the present application.

[0043] The electrode sheet 20 can be a positive electrode sheet or a negative electrode sheet. The portion of the electrode sheet 20 with active material constitutes the main body of the electrode assembly 10c, and the portion of the electrode sheet 20 without active material each constitutes a tab. During the charge and discharge process of the battery, the active material reacts with the electrolyte, and the tab connects the electrode terminal to form a current loop. Figure 2 As shown, the pole piece 20 can be divided into a main area 21 and a thinning area 22 along its width direction. Both the main area 21 and the thinning area 22 can be used to coat active materials. The thickness of the active material coated in the main area 21 is greater than the thickness of the active material coated in the thinning area 22. The pole piece 20 coated with the active material is then wound along its length to form an electrode assembly 10c. The active material can be coated on the pole piece 20 in the form of slurry, and then the slurry is fixed on the pole piece 20 by 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, lithium titanate, etc.

[0044] During the production process of the battery, the slurry needs to be coated on the electrode 20 to form an active material layer. In the related technical scheme, the active material at the edge is mainly thinned by a thinning device to form a thinning area 22 of the electrode 20. However, this method is difficult to accurately control the thickness of the thinning area 22, resulting in problems such as reduced product quality.

[0045] In order to solve the technical problems existing in the related technology, the present application provides a coating system 1, which may include a coating device 10 and a pole piece 20. The coating device 10 has two discharge ports. When the coating device 10 is used for slurry coating, one discharge port corresponds to the thinning area 22 of the pole piece 20, and one discharge port corresponds to the main body area 21 of the pole piece 20, so that the amount of slurry coated in the thinning area 22 can be accurately controlled, thereby improving the yield of the finished pole piece 20.

[0046] See also Figure 3 , Figure 3 is a first structural schematic diagram of a coating system 1 according to one or more embodiments of the present application.

[0047] The coating system 1 includes a pole piece 20 and a coating device 10. The pole piece 20 includes a main body area 21 and a thinning area 22. The coating device 10 is used to coat the slurry on the main body area 21 of the pole piece 20 and the thinning area 22 of the pole piece 20. The pole piece 20 can be divided into the main body area 21 and the thinning area 22 along the width direction, and the pole piece 20 can be wound along the length direction to form an electrode assembly 10c. The coating device 10 can be configured to coat a group of main body areas 21 and thinning areas 22 at a time to form Figure 2 The pole piece 20 shown, or the coating device 10 can also be configured to coat multiple groups of main body regions 21 and thinned regions 22 at one time to form Figure 4The pole piece 20 shown in FIG. Figure 4 The pole piece 20 shown in the figure can be cut along the dotted line to form four pole pieces as shown in the figure. Figure 2 The individual pole pieces 20 are shown, and then four individual pole pieces 20 are separately wound to form four electrode assemblies 10c.

[0048] Specifically, the coating device 10 may include a coating die 100 and a slurry supply source 200, wherein the coating die 100 is formed with a first discharge port 111 and a second discharge port 112 disposed adjacently; the slurry supply source 200 is connected to the coating die 100, and the slurry provided by the slurry supply source 200 is coated on the main body area 21 of the pole piece 20 via the first discharge port 111, and is coated on the thinning area 22 of the pole piece 20 via the second discharge port 112. The slurry supply source 200 is used to provide slurry, and the slurry supply source 200 may be connected to the coating die 100 through a pipeline, and then the slurry is input into the coating die 100 through the slurry supply source 200. The first discharge port 111 and the second discharge port 112 are arranged adjacent to each other. Specifically, the first discharge port 111 and the second discharge port 112 can be specifically arranged so that when the coating device 10 coats the electrode 20 with slurry, the first discharge port 111 corresponds to the position of the main body area 21 of the electrode 20, and the second discharge port 112 corresponds to the position of the thinning area 22 of the electrode 20. When it is necessary to coat the electrode 20 with slurry, the slurry can be input into the coating die 100 through the slurry supply source 200, and the slurry is then coated on the main body area 21 of the electrode 20 through the first discharge port 111, and coated on the thinning area 22 of the electrode 20 through the second discharge port 112, and the electrode 20 is moved while being coated by the coating die 100 to change the position of the electrode 20 corresponding to the first discharge port 111 and the second discharge port 112, so as to coat the slurry at different positions of the electrode 20.

[0049] Through the above embodiment, the coating die 100 has a first discharge port 111 and a second discharge port 112, and the slurry is coated on the main area 21 of the pole piece 20 through the first discharge port 111, and the slurry is coated on the thinning area 22 of the pole piece 20 through the second discharge port 112. The slurry can be coated on the main area 21 and the thinning area 22 through the same coating die 100, thereby improving the work efficiency of slurry coating, and the slurry of the thinning area 22 is separately supplied by the second discharge port 112, and the amount of slurry coated on the thinning area 22 can be accurately controlled through the second discharge port 112, thereby improving the yield of the finished pole piece 20.

[0050] In some embodiments, the ratio of the width of the second discharge port 112 of the coating device 10 to the width of the thinning zone 22 of the pole piece 20 is greater than or equal to 10% and less than or equal to 1. That is, the width of the second discharge port 112 is 10% to 100% of the width of the thinning zone 22. The width of the thinning zone 22 can be set to between 0 mm and 30 mm, for example, the width of the thinning zone 22 can be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm, etc., or the width of the thinning zone 22 can also be between 0 mm and 10 mm, between 0 mm and 20 mm, between 10 mm and 30 mm, or between 10 mm and 20 mm. Correspondingly, the width of the second discharge port 112 of the coating device 10 can be designed according to the width of the thinning zone 22. Thus, by limiting the width of the second discharge port 112, it is convenient to accurately control the amount of slurry flowing out of the second discharge port 112, thereby accurately controlling the finished product thickness of the thinning zone 22 and improving the finished product yield of the electrode 20.

[0051] In some embodiments, the number of the second outlets 112 is two, and the first outlet 111 is located between the two second outlets 112. The two second outlets 112 can be connected to the slurry supply source 200 respectively, and the two second outlets 112 are located on both sides of the first outlet 111. When the coating device 10 is used, the electrode 20 can be coated into a shape with a main body area 21 in the middle and thinning areas 22 on both sides. Figure 4 For example, there are three dotted lines from left to right, with the middle dotted line as the center, dividing the pole piece 20 into two parts along its width, each part includes thinning areas 22 on both sides and a main body area 21 in the middle. When there are two second discharge ports 112, and the two second discharge ports 112 are located on both sides of the first discharge port 111, the coating device 10 can coat the pole piece 20 into the form of one of the parts, so that the two thinning areas 22 can be coated with slurry at the same time, thereby improving the work efficiency of slurry coating. In some other embodiments, the coating die 100 may also include two first discharge ports 111 and four second discharge ports 112 at the same time, the two second discharge ports 112 are located between one first discharge port 111, and the two first discharge ports 111 and the four second discharge ports 112 are arranged side by side, so that the coating device 10 can be used to coat the pole piece 20 into the form of Figure 4 The pole piece 20 is shown in the form.

[0052] In some embodiments, the coating device 10 includes a delivery pipe 300 and an adjusting member 400. The delivery pipe 300 is connected to the second outlet 112 and the slurry supply source 200 through the adjusting member 400. The adjusting member 400 is used to adjust the flow rate of the slurry delivered to the second outlet 112. The delivery pipe 300 is connected to the second outlet 112 and the slurry supply source 200 respectively. The adjusting member 400 can be located on the delivery pipe 300. The flow rate of the slurry can be adjusted by the adjusting member 400, thereby adjusting the amount of slurry coated on the thinning area 22. Among them, the adjusting member 400 can include but is not limited to a screw pump or a regulating valve. When the adjusting member 400 is a screw pump, the flow rate of the slurry delivered to the second outlet 112 can be controlled by adjusting the pump speed of the screw pump. When there are multiple second outlets 112, the delivery pipeline 300 may include a main pipeline and multiple branch pipelines, the main pipeline is connected to the slurry supply source 200, each branch pipeline is respectively connected to the main pipeline and a second outlet 112, and each branch pipeline may be connected to an adjustment member 400. Thus, by adjusting the flow rate of the slurry delivered to the second outlet 112 through the adjustment member 400, the slurry amount of the second outlet 112 can be more accurately controlled, and then the finished product thickness of the thinning area 22 can be accurately controlled, thereby improving the finished product yield of the electrode 20.

[0053] Further, the coating device 10 also includes a controller 500, which is used to control the regulating member 400 to adjust the slurry flow rate delivered to the second discharge port 112. Exemplarily, when the regulating member 400 is a pump, the pump speed of the pump can be controlled by the controller 500, thereby controlling the slurry flow rate delivered to the second discharge port 112. The controller 500 can receive relevant control signals and control the regulating member 400 according to the control signals. For example, the control signal can be manually input to the controller 500, and the controller 500 controls the regulating member 400 according to the input control signal. Or the controller 500 can receive the thickness of the thinning area 22, and then generate a control signal according to the thickness of the thinning area 22, and control the regulating member 400 according to the control signal. Thus, by controlling the regulating member 400 to adjust the slurry flow rate delivered to the second discharge port 112 through the controller 500, the slurry amount of the second discharge port 112 can be further automatically and accurately controlled.

[0054] Furthermore, the coating device 10 further includes a thickness detector 600 for detecting the thickness of the skived area 22. The thickness detector 600 can be used to detect the thickness of the skived area 22 in real time. The thickness detector 600 can be connected to the controller 500 for communication, and transmit the detected thickness of the skived area 22 to the controller 500, so that the controller 500 can control the adjusting member 400 in real time according to the thickness of the skived area 22. Thus, by detecting the thickness of the skived area 22 by the thickness detector 600, it is convenient to control the flow rate of the slurry delivered by the adjusting member 400 to the second discharge port 112 according to the thickness detection result, and the thickness of the skived area 22 can be automatically and accurately controlled online.

[0055] Combination Figure 5 and Figure 6 , Figure 5 is a schematic structural diagram of a coating die according to one or more embodiments of the present application; Figure 6 It is a schematic diagram of the structure of the coating die 100 and the pole piece 20 according to one or more embodiments of the present application.

[0056] The coating die 100 includes a first die 120, a second die 130 and a gasket 110, wherein the gasket 110 is sandwiched between the first die 120 and the second die 130, and the gasket 110 is used to cooperate with at least one of the first die 120 and the second die 130 to form a first discharge port 111 and a second discharge port 112. Specifically, a groove may be provided on the gasket 110, so that when the gasket 110 is sandwiched between the first die 120 and the second die 130, the first discharge port 111 and / or the second discharge port 112 may be formed by cooperating with the first die 120 and the second die 130. Alternatively, a groove may be provided on one side of the first die 120 facing the gasket 110, so that when the gasket 110 is sandwiched between the first die 120 and the second die 130, the first discharge port 111 and / or the second discharge port 112 may be formed by cooperating with the gasket 110 and the second die 130. Alternatively, a groove may be provided on the side of the second die head 130 facing the gasket 110, so that when the gasket 110 is sandwiched between the first die head 120 and the second die head 130, the gasket 110 and the first die head 120 can cooperate to form the first outlet 111 and / or the second outlet 112, so that the size of the first outlet 111 and the second outlet 112 can be accurately controlled, and the amount of slurry in the first outlet 111 and the second outlet 112 can be accurately controlled. In addition, by forming the coating die head 100 through the cooperation of the first die head 120, the second die head 130 and the gasket 110, the molding difficulty of the coating die head 100 can be reduced.

[0057] Furthermore, the gasket 110 is provided with a slurry flow channel 113, one end of the slurry flow channel 113 is connected to the slurry supply source 200, and the other end of the slurry flow channel 113 cooperates with the first die head 120 or the second die head 130 to form a second discharge port 112. Figure 3 As shown, the slurry flow channel 113 can be in any shape, for example, the slurry flow channel 113 includes but is not limited to a straight flow channel or a curved flow channel. The slurry flow channel 113 can be opened on the side of the gasket 110 facing the first die head 120, so that when the gasket 110 is sandwiched between the first die head 120 and the second die head 130, the second discharge port 112 can be formed by the first die head 120 and the gasket 110. Alternatively, the slurry flow channel 113 can be opened on the side of the gasket 110 facing the second die head 130, so that when the gasket 110 is sandwiched between the first die head 120 and the second die head 130, the second discharge port 112 can be formed by the second die head 130 and the gasket 110. Alternatively, the slurry flow channel 113 can be opened on the side of the gasket 110 facing the first die head 120 and on the side of the gasket 110 facing the second die head 130, so that when the gasket 110 is clamped between the first die head 120 and the second die head 130, a second discharge port 112 can be formed by the first die head 120 cooperating with the gasket 110, and another second discharge port 112 can be formed by the second die head 130 cooperating with the gasket 110.

[0058] Further, the ratio between the depth of the slurry flow channel 113 and the thickness of the gasket 110 is greater than 0 and less than or equal to 80%. The thickness of the gasket 110 can be understood as: when the gasket 110 is sandwiched between the first die 120 and the second die 130, the first die 120 and the second die 130 are kept at a distance. Similarly, the depth of the slurry flow channel 113 can also be understood as the dimension of the slurry flow channel 113 in the distance direction between the first die 120 and the second die 130. Among them, the ratio between the depth of the slurry flow channel 113 and the thickness of the gasket 110 can be 10%, 20%, 30%, 40%, 50%, 60%, 70% or 80%, etc. The ratio between the depth of the slurry flow channel 113 and the thickness of the gasket 110 may also be between 10% and 80%, between 20% and 80%, between 20% and 70%, between 30% and 60%, or between 40% and 70%, etc. Thus, by limiting the depth of the slurry flow channel 113, it is convenient to accurately control the amount of slurry flowing out of the second discharge port 112.

[0059] In some embodiments, at least one of the first die head 120 and the second die head 130 is provided with a drainage groove 140, and the drainage groove 140 is used to guide the slurry to flow out from the first outlet 111. A concave drainage groove 140 can be opened on the side of the first die head 120 facing the gasket 110. When the gasket 110 is sandwiched between the first die head 120 and the second die head 130, the opening of the drainage groove 140 can be blocked by the gasket 110, and the slurry flowing out of the slurry supply source 200 can flow into the drainage groove 140 and contact the gasket 110, so that the slurry flows out through the first outlet 111. Alternatively, a recessed drainage groove 140 may be provided on the side of the second die head 130 facing the gasket 110. When the gasket 110 is clamped between the first die head 120 and the second die head 130, the opening of the drainage groove 140 may be blocked by the gasket 110, and the slurry flowing out of the slurry supply source 200 may flow into the drainage groove 140 and contact the gasket 110, thereby allowing the slurry to flow out through the first discharge port 111. Alternatively, a recessed drainage groove 140 may be provided on the side of the first die head 120 facing the gasket 110, and a recessed drainage groove 140 may be provided on the side of the second die head 130 facing the gasket 110. When the gasket 110 is clamped between the first die head 120 and the second die head 130, the opening of the drainage groove 140 may be blocked by the gasket 110, and the slurry flowing out of the slurry supply source 200 may flow into the drainage groove 140 and contact the gasket 110, thereby allowing the slurry to flow out through the first discharge port 111.

[0060] See also Figure 7 , Figure 7 is a second structural schematic diagram of the coating system 1 according to one or more embodiments of the present application.

[0061] The slurry supply source 200 includes a first supply source and a second supply source. The slurry provided by the first supply source is applied to the main area 21 of the pole piece 20 via the first discharge port 111, and the slurry provided by the second supply source is applied to the thinning area 22 of the pole piece 20 via the second discharge port 112. The first supply source and the second supply source can exist independently of each other, that is, the first supply source and the second supply source are separately arranged. Or the first supply source and the second supply source are integrally arranged, that is, the slurry supply source 200 includes two boxes for storing slurry at the same time, one of which is the first supply source and the other is the second supply source. The first supply source can be connected to the first discharge port 111 through a pipeline, so that the first supply source applies the slurry to the main area 21 of the pole piece 20 via the first discharge port 111, and the second supply source can be connected to the second discharge port 112 through a pipeline, so that the second supply source applies the slurry to the thinning area 22 of the pole piece 20 via the second discharge port 112.

[0062] To summarize, the coating die 100 has a first discharge port 111 and a second discharge port 112. The slurry is coated on the main area 21 of the pole piece 20 via the first discharge port 111, and the slurry is coated on the thinning area 22 of the pole piece 20 via the second discharge port 112. The slurry can be coated on the main area 21 and the thinning area 22 through the same coating die 100, thereby improving the work efficiency of slurry coating, and the slurry in the thinning area 22 is separately supplied by the second discharge port 112. The amount of slurry coated on the thinning area 22 can be accurately controlled through the second discharge port 112, thereby improving the yield of the finished pole piece 20.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating device, characterized in that: The coating equipment comprises: The coating die head is formed with a first discharge port and a second discharge port which are adjacently arranged; A slurry supply source is connected to the coating die head. The slurry provided by the slurry supply source is coated on the main area of ​​the pole piece through the first discharge port and is coated on the thinning area of ​​the pole piece through the second discharge port.

2. The coating device according to claim 1, characterized in that: The number of the second discharge ports is two, and the first discharge port is located between the two second discharge ports.

3. The coating device according to claim 1, characterized in that: The coating device comprises a conveying pipeline and an adjusting member, wherein the conveying pipeline is connected to the second discharge port and the slurry supply source through the adjusting member, and the adjusting member is used to adjust the flow rate of the slurry conveyed to the second discharge port.

4. The coating device according to claim 3, characterized in that: The coating device further includes a controller, which is used to control the regulating member to regulate the flow rate of the slurry delivered to the second discharge port.

5. The coating device according to claim 4, characterized in that: The coating device further comprises a thickness detector for detecting the thickness of the skived area.

6. The coating device according to any one of claims 1 to 5, characterized in that: The coating die includes a first die, a second die and a gasket, wherein the gasket is sandwiched between the first die and the second die, and the gasket is used to cooperate with at least one of the first die and the second die to form the first discharge port and the second discharge port.

7. The coating device according to claim 6, characterized in that: The gasket is provided with a slurry flow channel, one end of the slurry flow channel is connected to the slurry supply source, and the other end of the slurry flow channel cooperates with the first die head or the second die head to form the second discharge port.

8. The coating device according to claim 7, characterized in that: The ratio of the depth of the slurry flow channel to the thickness of the gasket is greater than 0 and less than or equal to 80%.

9. The coating device according to claim 6, characterized in that: At least one of the first die head and the second die head is provided with a drainage groove, and the drainage groove is used to guide the slurry to flow out from the first discharge port.

10. The coating device according to claim 1, characterized in that: The slurry supply source includes a first supply source and a second supply source. The slurry provided by the first supply source is coated on the main area of ​​the pole piece through the first outlet, and the slurry provided by the second supply source is coated on the thinning area of ​​the pole piece through the second outlet.

11. A coating system, characterized in that: The coating system comprises a pole piece and a coating device as claimed in any one of claims 1 to 10, wherein the pole piece comprises a main body area and a thinning area, and the coating device is used to coat the slurry on the main body area of ​​the pole piece and the thinning area of ​​the pole piece.

12. The coating system according to claim 11, characterized in that: The ratio of the width of the second discharge port of the coating device to the width of the pole piece thinning area is greater than or equal to 10% and less than or equal to 1.

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