Coating system and coating method

Abstract

Provided are a coating system (1) and a coating method. The coating system (1) comprises a carrier mechanism (11), a coating mechanism (12) and an adjustment mechanism (13), wherein a coating slit (152) is provided between a coating lip (121) of the coating mechanism (12) and the carrier mechanism (11), and a slurry is discharged from the coating lip (121), then passes through the coating slit (152) and is coated on a target substrate (14); and the adjustment mechanism (13) comprises a first adjustment mechanism (131) and a second adjustment mechanism (132) respectively arranged on two sides of the coating slit (152) along the conveying direction of the carrier mechanism (11), the first adjustment mechanism (131) and the second adjustment mechanism (132) both being configured to apply a force to the coating slit (152). The second adjustment mechanism (132) can assist the first adjustment mechanism (131) in applying a force to the coating slit (152), and the force exerted by the first adjustment mechanism (131) can be reduced when the resultant force applied to the slurry in the coating slit (152) reaches an expected magnitude and direction, so as to mitigate the problem of surface ripples forming in the slurry due to an excessive force applied by the first adjustment mechanism (131) to the slurry, which in turn leads to texture on a surface of an electrode plate, thereby improving the coating quality of the coating system (1) and the performance of the electrode plate.

Description

Coating system and coating method

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application 202410437028.5, filed on April 11, 2024, entitled “Coating system and coating method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a coating system and a coating method. BACKGROUND

[0004] In the production process of batteries, the coating process of the electrode sheet is an important link in process design and production process, and the quality of coating plays a decisive role in the performance of the entire battery. Therefore, in the production process of batteries, it is crucial to improve the coating quality and coating efficiency.

[0005] At present, in the coating process of the electrode sheet, due to the interaction between the slurry and other structural parts, the surface of the slurry is prone to produce lines, which affects the quality of the electrode sheet, and needs to be improved.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a coating system and a coating method, which can improve the problem of lines on the surface of the slurry of the electrode sheet, improve the coating quality of the coating system, and improve the performance of the electrode sheet.

[0008] In a first aspect, the present application provides a coating system, comprising: a carrying mechanism for carrying and conveying a target substrate; a coating mechanism comprising a coating lip mouth facing the carrying mechanism, a coating slit being provided between the coating lip mouth and the carrying mechanism, so that the slurry flowing out of the coating lip mouth can be coated on the target substrate by the coating slit; an adjusting mechanism comprising a first adjusting mechanism and a second adjusting mechanism, the second adjusting mechanism and the first adjusting mechanism being arranged on both sides of the coating slit along the conveying direction of the carrying mechanism, and the first adjusting mechanism and the second adjusting mechanism are both used for applying force to the coating slit.

[0009] In the technical scheme of the embodiment of the present application, the coating system comprises a bearing mechanism, a coating mechanism and an adjusting mechanism. The bearing mechanism is used for bearing and conveying the target substrate. A coating gap is arranged between the coating lip of the coating mechanism and the bearing mechanism. The slurry is coated on the target substrate of the bearing mechanism through the coating gap after leaking out of the coating lip. The adjusting mechanism comprises a first adjusting mechanism and a second adjusting mechanism which are separately arranged on both sides of the coating gap along the conveying direction of the bearing mechanism. The first adjusting mechanism and the second adjusting mechanism are both used for applying force to the coating gap. In this way, when the first adjusting mechanism applies force to the slurry in the coating gap, the second adjusting mechanism can assist the first adjusting mechanism to apply force to the coating gap. In the case that the size and direction of the resultant force of the slurry in the coating gap reach the expected target, the force of the first adjusting mechanism can be reduced, so as to improve the problem that the surface of the slurry will produce corrugation due to the excessive force of the first adjusting mechanism on the slurry, so that the surface of the pole piece produces lines, improve the coating quality of the coating system, and improve the performance of the pole piece.

[0010] In some embodiments, the first adjusting mechanism is used for applying a first force with adjustable intensity to the coating gap, and / or the second adjusting mechanism is used for applying a second force with adjustable intensity to the coating gap.

[0011] In the technical scheme of the embodiment of the present application, the first adjusting mechanism can apply a first force with adjustable intensity to the coating gap, and / or the second adjusting mechanism can apply a second force with adjustable intensity to the coating gap. Therefore, the coating state of the surface slurry of the target substrate can be accurately controlled by adjusting the size of the first force and / or the second force, so as to improve the coating quality of the coating system.

[0012] In some embodiments, the first adjusting mechanism is provided with adjustable setting of the direction of the first force acting on the coating gap, and / or the second adjusting mechanism is provided with adjustable setting of the direction of the second force acting on the coating gap.

[0013] In the technical scheme of the embodiment of the present application, the first adjusting mechanism can apply a first force with adjustable direction to the coating gap, and / or the second adjusting mechanism can apply a second force with adjustable direction to the coating gap. Therefore, the surface slurry of the target substrate can be accurately adjusted by adjusting the direction of the first force and / or the second force, so as to improve the coating quality of the coating system.

[0014] In some embodiments, the first adjusting mechanism is located on one side of the second adjusting mechanism along the conveying direction of the bearing mechanism. The first adjusting mechanism is used for applying a first force to the coating gap, which is away from the conveying direction of the bearing mechanism.

[0015] In the technical scheme of the embodiment of the present application, the first adjusting mechanism is used to apply a first force to the coating slot in a direction away from the conveying direction of the bearing mechanism, so that the first adjusting mechanism can continuously apply the force to the slurry of the coating slot during the operation of the adjusting mechanism, thereby reducing the influence of the lines on the surface of the slurry caused by the internal structure of the coating mechanism on the coating quality of the coating system.

[0016] In some embodiments, at least one of the first adjusting mechanism and the second adjusting mechanism is a pressure actuator, which includes a pressure cavity and an output port in communication with each other, and the output port is arranged towards the coating slot so that the output port can apply a positive pressure thrust or a negative pressure suction to the coating slot; or at least one of the first adjusting mechanism and the second adjusting mechanism is an electromagnetic actuator, which can apply an attractive force or a repulsive force to the coating slot.

[0017] In the technical scheme of the embodiment of the present application, the pressure actuator is used to apply a positive pressure thrust or a negative pressure suction to the slurry in the coating slot to adjust the coating quality of the slurry on the surface of the target substrate, and the pressure actuator has low control difficulty; or the electromagnetic actuator is used to apply an attractive force or a repulsive force to the slurry in the coating slot to adjust the coating quality of the slurry on the surface of the target substrate, and the electromagnetic actuator has a compact structure and occupies less space, thereby improving the coating quality of the coating system.

[0018] In some embodiments, at least one of the first adjusting mechanism and the second adjusting mechanism includes a plurality of adjusting parts arranged at intervals along the width direction of the target substrate, and each adjusting part includes a force applying part and an adjusting part, the force applying part is used to apply a force to the coating slot, and the adjusting part is used to control the output power of the force applying part.

[0019] In the technical scheme of the embodiment of the present application, at least one of the first adjusting mechanism and the second adjusting mechanism includes a plurality of adjusting parts arranged at intervals along the width direction of the target substrate, and each adjusting part includes a force applying part and an adjusting part, the force applying part is used to apply a force to the coating slot, so that the adjusting mechanism can apply different forces to different regions in the width direction of the target substrate, thereby enabling the adjusting mechanism to accurately adjust the slurry in different parts, and improving the coating quality of the coating system.

[0020] In some embodiments, the coating system further includes a detection mechanism, the adjusting mechanism is arranged between the coating mechanism and the detection mechanism, the detection mechanism is used to obtain slurry coating information of the target substrate, and the adjusting mechanism is used to adjust the force acting on the coating slot according to the slurry coating information.

[0021] In the technical scheme of the embodiment of the present application, the coating system further includes a detection mechanism, the detection mechanism can obtain slurry coating information of the target substrate, and the adjusting mechanism can adjust the force acting on the coating slot according to the slurry coating information, thereby improving the adjusting effect of the adjusting mechanism on the slurry and improving the coating quality of the coating system.

[0022] In a second aspect, the present application provides a coating method applied to the coating system of the first aspect, the coating method comprising:

[0023] causing the coating mechanism to coat the slurry on the target substrate;

[0024] causing the first adjusting mechanism and the second adjusting mechanism to apply forces to the slurry in the coating slot.

[0025] In the technical solution of the embodiments of the present application, when the coating mechanism coats the slurry on the target substrate, the first adjusting mechanism and the second adjusting mechanism jointly apply forces to the slurry in the coating slot. Thus, when the first adjusting mechanism applies a force to the slurry in the coating slot, the second adjusting mechanism can assist the first adjusting mechanism to apply a force to the coating slot. In the case where the size and direction of the resultant force of the slurry in the coating slot reach the desired target, the size of the force of the first adjusting mechanism can be reduced to improve the problem that the surface of the slurry will produce ripples due to the excessive force of the first adjusting mechanism on the slurry, so that the surface of the pole piece produces lines, improve the coating quality of the coating system, and improve the performance of the pole piece.

[0026] In some embodiments, the coating system further comprises a detection mechanism, the first adjusting mechanism is configured to apply a first force to the coating slot, and the second adjusting mechanism is configured to apply a second force to the coating slot. The step of "causing the first adjusting mechanism and the second adjusting mechanism to apply forces to the coating slot" comprises:

[0027] causing the detection mechanism to obtain slurry coating information of the target substrate;

[0028] causing the first adjusting mechanism to apply a first force to the slurry in the coating slot according to the slurry coating information, and causing the second adjusting mechanism to apply a second force to the slurry in the coating slot according to the slurry coating information.

[0029] In the technical solution of the embodiments of the present application, the detection mechanism can obtain the slurry coating information of the target substrate, and the adjusting mechanism can adjust the force acting on the coating slot according to the slurry coating information to improve the adjusting effect of the adjusting mechanism on the slurry and improve the coating quality of the coating system.

[0030] In some embodiments, the slurry coating information comprises a slurry thickness value, and the step of "causing the first adjusting mechanism to apply a first force to the slurry in the coating slot according to the slurry coating information, and causing the second adjusting mechanism to apply a second force to the slurry in the coating slot according to the slurry coating information" comprises:

[0031] If the slurry thickness value is less than the preset slurry thickness value, the second adjusting mechanism is caused to apply a second force to the slurry in the coating slot, and the first adjusting mechanism is caused to apply a first force to the slurry in the coating slot, and the second force is greater than the first force.

[0032] In the technical solution of the embodiments of the present application, if the slurry thickness value is less than the preset slurry thickness value, the second adjusting mechanism is caused to apply a second force to the slurry in the coating slot, so as to improve the problem of lines on the surface of the slurry, the second adjusting mechanism is caused to apply a second force to the slurry in the coating slot, and the second force is greater than the first force, so that the slurry in the coating slot is subjected to a resultant force in the transmission direction, so that the target substrate surface can cover thicker slurry, and the problem of too thin slurry on the target substrate surface is improved.

[0033] In some embodiments, the slurry coating information includes slurry surface information, and in the step of "causing the first adjusting mechanism to apply a first force to the slurry in the coating slot according to the slurry coating information", the first adjusting mechanism is caused to apply the first force to the slurry in the coating slot according to the slurry surface information.

[0034] If the slurry surface has lines extending in the length direction of the target substrate, the first adjusting mechanism is caused to reduce the first force towards the coating slot.

[0035] If the slurry surface has lines extending in the width direction of the target substrate, the first adjusting mechanism is caused to increase the first force towards the coating slot.

[0036] In the technical solution of the embodiments of the present application, the first force of the first adjusting mechanism is adjusted according to the lines on the slurry surface by the above-mentioned solution, so as to improve the problem that the lines on the slurry surface affect the quality of the pole piece.

[0037] In some embodiments, the coating system further comprises a processing mechanism, the processing mechanism being electrically connected with the detecting mechanism and the adjusting mechanism, and in the step of "causing the first adjusting mechanism to apply a first force to the slurry in the coating slot according to the slurry coating information, and causing the second adjusting mechanism to apply a second force to the slurry in the coating slot according to the slurry coating information", the processing mechanism is caused to form a processing strategy according to the slurry coating information.

[0038] The processing mechanism is caused to form a processing strategy according to the slurry coating information.

[0039] The first adjusting mechanism and the second adjusting mechanism are caused to periodically apply forces to the slurry in the coating slot according to the processing strategy.

[0040] In the technical solution of the embodiments of the present application, the processing mechanism is caused to form a processing strategy according to the slurry coating information, and the first adjusting mechanism and the second adjusting mechanism are caused to periodically apply forces to the slurry in the coating slot according to the processing strategy, so as to improve the problem that the coating quality of the pole piece does not meet the expected requirements due to periodic fluctuations of the coating mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0042] FIG. 1 is a schematic diagram of a coating system according to an embodiment of the present application;

[0043] FIG. 2 is a schematic diagram of a force state of the coating system according to an embodiment of the present application;

[0044] FIG. 3 is a schematic diagram of an adjusting mechanism of the coating system according to an embodiment of the present application;

[0045] FIG. 4 is a flowchart of a coating method according to an embodiment of the present application.

[0046] Reference Signs List:

[0047] 1, coating system; 11, bearing mechanism; 12, coating mechanism; 121, coating lip; 13, adjusting mechanism; 131, first adjusting mechanism; 132, second adjusting mechanism; 133, adjusting part; 1331, force applying member; 1332, adjusting member; 14, target substrate; 151, liquid bridge; 152, coating slit; 16, detecting mechanism; 17, processing mechanism. DETAILED DESCRIPTION

[0048] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0050] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0051] In addition, the technical terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0052] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0054] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0055] In the present application, the battery monomer can include lithium ion secondary battery monomer, lithium ion primary battery monomer, lithium-sulfur battery monomer, sodium lithium ion battery monomer, sodium ion battery monomer or magnesium ion battery monomer, etc. The embodiments of the present application are not limited to this. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of the present application are not limited to this.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery monomers. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomers.

[0057] The battery monomer includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery monomer mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer coated on the surface of the positive current collector; the positive current collector includes a positive current collecting portion and a positive tab connected to the positive current collecting portion, and the positive current collecting portion is coated with the positive active material layer, and the positive tab is not coated with the positive active material layer. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative current collector and a negative active material layer coated on the surface of the negative current collector; the negative current collector includes a negative current collecting portion and a negative tab connected to the negative current collecting portion, and the negative current collecting portion is coated with the negative active material layer, and the negative tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0058] In the prior art, after the substrate is coated with the slurry, the surface of the slurry is prone to form lines.

[0059] In the related art, after the coating mechanism coats the slurry on the target substrate, the thickness of the slurry needs to be adjusted by the adjusting mechanism, and the adjusting mechanism usually provides a positive pressure thrust to the slurry in the coating gap to limit the thickness of the slurry. The adjusting mechanism applies a force to the first surface of the slurry, and when the slurry is applied to the target substrate, the first surface is arranged away from the target substrate, and under the action of the pressure, the first surface of the slurry is prone to form corrugations, and as the conveying mechanism conveys the target substrate, the corrugations of the first surface will form lines on the surface of the electrode slurry, thereby affecting the performance of the electrode.

[0060] Based on the above problems, the embodiment of the present application provides a coating system, the coating system comprises a bearing mechanism, a coating mechanism and an adjusting mechanism, the bearing mechanism is used for bearing and conveying a target substrate, a coating slit is arranged between a coating lip of the coating mechanism and the bearing mechanism, and slurry is coated on the target substrate of the bearing mechanism through the coating slit after leaking out of the coating lip; the adjusting mechanism comprises a first adjusting mechanism and a second adjusting mechanism which are separately arranged on both sides of the coating slit along the conveying direction of the bearing mechanism, and the first adjusting mechanism and the second adjusting mechanism are both used for applying force to the coating slit, so that when the first adjusting mechanism applies force to the slurry in the coating slit, the second adjusting mechanism can assist the first adjusting mechanism to apply force to the coating slit, and in the case that the size and direction of the resultant force of the slurry in the coating slit reach the expected target, the force of the first adjusting mechanism can be reduced, so as to improve the problem that the surface of the slurry will produce corrugation due to the excessive force of the first adjusting mechanism on the slurry, so that the surface of the pole piece produces lines, improve the coating quality of the coating system, and improve the performance of the pole piece.

[0061] As shown in FIG. 1, FIG. 1 is a structural schematic diagram of the coating system provided by the embodiment of the present application.

[0062] The first aspect, as shown in FIG. 1, the present application provides a coating system 1, the coating system 1 comprises a bearing mechanism 11, a coating mechanism 12 and an adjusting mechanism 13, the bearing mechanism 11 is used for bearing and conveying a target substrate 14; the coating mechanism 12 comprises a coating lip 121 facing the bearing mechanism 11, a coating slit 152 is arranged between the coating lip 121 and the bearing mechanism 11, so that the slurry flowing out of the coating lip 121 can be coated on the target substrate 14 through the coating slit 152; the adjusting mechanism 13 comprises a first adjusting mechanism 131 and a second adjusting mechanism 132, the second adjusting mechanism 132 and the first adjusting mechanism 131 are separately arranged on both sides of the coating slit 152 along the conveying direction of the bearing mechanism 11, and the first adjusting mechanism 131 and the second adjusting mechanism 132 are both used for applying force to the coating slit 152.

[0063] In the scheme of the embodiment of the present application, the coating system 1 comprises a bearing mechanism 11, a coating mechanism 12 and an adjusting mechanism 13. The bearing mechanism 11 is used for bearing and conveying the target substrate 14. The coating mechanism 12 is provided with a coating slit 152 between the coating lip 121 of the coating mechanism 12 and the bearing mechanism 11. The slurry is leaked out of the coating lip 121 and coated on the target substrate 14 of the bearing mechanism 11 through the coating slit 152. The adjusting mechanism 13 comprises a first adjusting mechanism 131 and a second adjusting mechanism 132 which are separately arranged on both sides of the coating slit 152 along the conveying direction of the bearing mechanism 11. Both the first adjusting mechanism 131 and the second adjusting mechanism 132 are used for applying force to the coating slit 152. In this way, when the first adjusting mechanism 131 applies force to the slurry in the coating slit 152, the second adjusting mechanism 132 can assist the first adjusting mechanism 131 to apply force to the coating slit 152. When the size and direction of the resultant force applied to the slurry in the coating slit 152 reach the expected target, the force of the first adjusting mechanism 131 can be reduced to improve the problem that the surface of the slurry will produce corrugation due to the excessive force of the first adjusting mechanism 131 on the slurry, so that the surface of the pole piece produces lines, improve the coating quality of the coating system 1 and improve the performance of the pole piece.

[0064] The bearing mechanism 11 can be a conveying belt or a conveying roller. After the target substrate 14 is coated with slurry at the coating mechanism 12, the bearing mechanism 11 conveys the target substrate 14 to the next station. The target substrate 14 refers to the current collector coated with slurry at the coating mechanism 12. Specifically, the current collector can be a positive electrode current collector or a negative electrode current collector, and the current collector can be a copper foil or an aluminum foil, etc. The slurry can be a mixture of positive active material and organic solvent, or can be a mixture of negative active material and organic solvent.

[0065] The coating mechanism 12 comprises a coating die head, and the coating die head comprises an upper die head and a lower die head. An extrusion gap is arranged between the upper die head and the lower die head. The extrusion gap comprises the coating lip 121 at the end thereof. The slurry is coated on the target substrate 14 through the coating lip 121 of the extrusion gap.

[0066] The coating lip 121 and the bearing mechanism 11 are provided with the coating slit 152 therebetween. The slurry is coated on the target substrate 14 through the coating slit 152, and the slurry in the coating slit 152 is referred to as the liquid bridge 151. The conveying direction of the bearing mechanism 11 refers to the tangent of the conveying roller at the coating slit 152 and in the clockwise direction.

[0067] The adjusting mechanism 13 comprises a first adjusting mechanism 131 and a second adjusting mechanism 132, which are arranged on both sides of the coating slit 152 along the conveying direction of the bearing mechanism 11. The first adjusting mechanism 131 and the second adjusting mechanism 132 are used to apply a force to the coating slit 152, which means that the first adjusting mechanism 131 and the second adjusting mechanism 132 are respectively used to apply a force to the surfaces on both sides of the liquid bridge 151 along the conveying direction.

[0068] The liquid bridge 151 comprises a first surface and a second surface arranged oppositely along the conveying direction, and specifically, the direction in which the second surface points to the first surface is the conveying direction. The first adjusting mechanism 131 is used to apply a force to the first surface, and the second adjusting mechanism 132 is used to apply a force to the second surface. If the force applied by the first adjusting mechanism 131 is too large, it will cause the first surface to produce ripples, so the second adjusting mechanism 132 can assist the first adjusting mechanism 131. The second adjusting mechanism 132 applies a force to the second surface, and if the second surface produces ripples at this time, as the slurry is applied to the target substrate 14, the second surface is attached to the target substrate 14, and the ripples acting on the second surface will also be smoothed under the action of gravity, and the second surface is located inside the slurry, so the second adjusting mechanism 132 will not cause the problem of producing lines on the surface of the pole piece. Due to the cooperation of the first adjusting mechanism 131 and the second adjusting mechanism 132, the force of the liquid bridge 151 can be reduced under the condition that the size and direction of the resultant force of the liquid bridge 151 do not change, and the risk of producing lines on the surface of the pole piece due to the ripples on the surface of the liquid bridge 151 can be reduced.

[0069] Please refer to FIG. 2, which is a force diagram of the running state of the coating system according to an embodiment of the present application.

[0070] In some embodiments, as shown in FIGS. 1 and 2, the first adjusting mechanism 131 is used to apply a first force F1 with adjustable strength to the coating slit 152, and / or the second adjusting mechanism 132 is used to apply a second force F2 with adjustable strength to the coating slit 152.

[0071] In these embodiments, the first adjusting mechanism 131 can apply a first force F1 with adjustable strength to the coating slit 152, and / or the second adjusting mechanism 132 can apply a second force F2 with adjustable strength to the coating slit 152, so that the size of the first force F1 and / or the second force F2 can be adjusted to accurately control the coating state of the surface slurry of the target substrate 14, thereby improving the coating quality of the coating system 1.

[0072] The first adjusting mechanism 131 and / or the second adjusting mechanism 132 applies an adjustable strength force to the liquid bridge 151, so as to adjust the size and direction of the resultant force acting on the liquid bridge 151.

[0073] For example, when the first force F1 and the second force F2 have the same direction, the size of the first force F1 and / or the second force F2 is adjusted to adjust the size of the resultant force of the liquid bridge 151, so that the adjusting mechanism 13 can adjust the thickness of the slurry layer; or when the first force F1 and the second force F2 have different directions, the size of the first force F1 and / or the second force F2 is adjusted to adjust the direction of the resultant force of the liquid bridge 151, so that the adjusting mechanism 13 can thicken or thin the slurry layer.

[0074] In some embodiments, as shown in FIG. 1 and FIG. 2, the first adjusting mechanism 131 is provided with adjustable direction of the first force F1 acting on the coating slot 152, and / or the second adjusting mechanism 132 is provided with adjustable direction of the second force F2 acting on the coating slot 152.

[0075] In these embodiments, the first adjusting mechanism 131 can apply a first force F1 with adjustable direction to the coating slot 152, and / or the second adjusting mechanism 132 can apply a second force F2 with adjustable direction to the coating slot 152, so that the direction of the first force F1 and / or the second force F2 can be adjusted, and the adjusting mechanism 13 can accurately adjust the surface slurry of the target substrate 14 to improve the coating quality of the coating system 1.

[0076] The first adjusting mechanism 131 and / or the second adjusting mechanism 132 applies an adjustable strength force to the liquid bridge 151, so as to adjust the size and direction of the resultant force acting on the liquid bridge 151.

[0077] For example, when the first force F1 is greater than the second force F2, and the directions of the first force F1 and the second force F2 are both the conveying direction, the resultant force direction is the conveying direction, so that the thickness of the paste on the target substrate 14 can be increased when the thickness of the paste on the target substrate 14 is insufficient; when the first force F1 is greater than the second force F2, and the directions of the first force F1 and the second force F2 are both away from the conveying direction, the resultant force direction is away from the conveying direction, so that the thickness of the paste on the target substrate 14 can be reduced when the thickness of the paste on the target substrate 14 is excessive, and the problem of ripples on the surface of the liquid bridge 151 caused by excessive first force can be improved; when the first force F1 is greater than the second force F2, and the direction of the first force F1 is away from the conveying direction, and the direction of the second force F2 is the conveying direction, the resultant force direction is away from the conveying direction, so that the thickness of the paste on the target substrate 14 can be reduced when the thickness of the paste on the target substrate 14 is excessive; when the first force F1 is greater than the second force F2, and the direction of the first force F1 is the conveying direction, and the direction of the second force F2 is away from the conveying direction, the resultant force direction is the conveying direction, so that the thickness of the paste on the target substrate 14 can be increased when the thickness of the paste on the target substrate 14 is insufficient.

[0078] When the first force F1 is less than the second force F2, and the directions of the first force F1 and the second force F2 are both away from the conveying direction, the resultant force direction is away from the conveying direction, so that the thickness of the paste on the target substrate 14 can be reduced when the thickness of the paste on the target substrate 14 is excessive, and the problem of ripples on the surface of the liquid bridge 151 caused by excessive first force can be improved; when the first force F1 is less than the second force F2, and the directions of the first force F1 and the second force F2 are both the conveying direction, the resultant force direction is the conveying direction, so that the thickness of the paste on the target substrate 14 can be increased when the thickness of the paste on the target substrate 14 is insufficient; when the first force F1 is less than the second force F2, and the direction of the first force F1 is the conveying direction, and the direction of the second force F2 is away from the conveying direction, the resultant force direction is away from the conveying direction, so that the thickness of the paste on the target substrate 14 can be increased when the thickness of the paste on the target substrate 14 is insufficient; when the first force F1 is less than the second force F2, and the direction of the first force F1 is away from the conveying direction, and the direction of the second force F2 is the conveying direction, the resultant force direction is the conveying direction, so that the thickness of the paste on the target substrate 14 can be increased when the thickness of the paste on the target substrate 14 is insufficient.

[0079] In some embodiments, as shown in FIGS. 1 and 2, the first adjusting mechanism 131 is located on one side of the second adjusting mechanism 132 along the conveying direction of the carrying mechanism 11, and the first adjusting mechanism 131 is used to apply a first force away from the conveying direction of the carrying mechanism 11 to the coating slit 152.

[0080] In these embodiments, the first adjusting mechanism 131 is used to apply a first force to the coating slit 152 in a direction away from the conveying direction of the bearing mechanism 11, so that the first adjusting mechanism 131 can continuously apply a force to the slurry of the coating slit 152 during the operation of the adjusting mechanism 13, to reduce the influence of the lines on the slurry surface caused by the internal structure of the coating mechanism 12 on the coating quality of the coating system 1.

[0081] During the process of releasing the slurry from the coating mechanism 12 to the coating slit 152, the surface of the slurry in the coating slit 152 is prone to form lines due to the influence of the adjusting blocks, pipelines or other structural parts in the coating die. The first force applied by the first adjusting mechanism 131 to the first surface of the liquid bridge 151 can smooth the lines. Therefore, during the operation of the adjusting mechanism 13, the first force is kept towards the liquid bridge 151 to keep the slurry on the substrate surface smooth, and the direction and size of the resultant force acting on the liquid bridge 151 are adjusted by adjusting the size of the first force and the direction and size of the second force.

[0082] In some embodiments, as shown in FIG. 1, at least one of the first adjusting mechanism 131 and the second adjusting mechanism 132 is a pressure actuator, which includes a pressure cavity and an output port in communication with each other, and the output port is arranged towards the coating slit 152 so that the output port can apply a positive pressure thrust or a negative pressure suction to the coating slit 152; or at least one of the first adjusting mechanism 131 and the second adjusting mechanism 132 is an electromagnetic actuator, which can apply an attractive force or a repulsive force to the coating slit 152.

[0083] In these embodiments, the slurry in the coating slit 152 is applied with a positive pressure thrust or a negative pressure suction by the pressure actuator to adjust the coating quality of the slurry on the surface of the target substrate 14, which has low control difficulty, or the slurry in the coating slit 152 is applied with an attractive force or a repulsive force by the electromagnetic actuator to adjust the coating quality of the slurry on the surface of the target substrate 14, which has a compact structure and occupies less space, thereby improving the coating quality of the coating system 1.

[0084] The adjusting mechanism 13 can be a pressure actuator or an electromagnetic actuator. Specifically, the first adjusting mechanism 131 and the second adjusting mechanism 132 are both pressure actuators, or the first adjusting mechanism 131 and the second adjusting mechanism 132 are both electromagnetic actuators, or one of the first adjusting mechanism 131 and the second adjusting mechanism 132 is a pressure actuator and the other is an electromagnetic actuator.

[0085] The pressure actuator includes a pressure cavity and an output port. The pressure cavity can be a positive pressure chamber, and the pressure actuator outputs a pushing force to the slurry in the coating slot 152. Or the pressure cavity can be a negative pressure chamber, and the pressure actuator outputs a suction force to the slurry in the coating slot 152. The power of the pressure actuator is adjusted to adjust the force applied by the pressure actuator to the slurry in the coating slot 152. Positive pressure refers to a state of gas with a pressure higher than atmospheric pressure. Negative pressure refers to a state of gas with a pressure lower than atmospheric pressure.

[0086] Optionally, when installing the pressure actuator, due to the narrow width of the coating slot 152, it is difficult to keep the output port axis parallel to the conveying direction. Therefore, the pressure actuator can be installed on one side of the coating slot 152, keeping the output port axis intersecting with the conveying direction, and keeping the force of the pressure actuator including a component along or away from the conveying direction.

[0087] The electromagnetic actuator can be an electromagnetic coil assembly. The direction of the current in the electromagnetic coil is adjusted to control the electromagnetic actuator to apply an attractive force or a repulsive force to the slurry in the coating slot 152. The size of the current in the electromagnetic coil is adjusted to control the electromagnetic actuator to apply a force to the slurry in the coating slot 152.

[0088] Referring to FIG. 3, FIG. 3 is a structural schematic diagram of an adjustment mechanism of a coating system according to an embodiment.

[0089] In some embodiments, as shown in FIG. 1 and FIG. 3, at least one of the first adjustment mechanism 131 and the second adjustment mechanism 132 includes a plurality of adjustment portions 133 arranged along the width direction of the target substrate 14. The adjustment portion 133 includes a force applying member 1331 for applying a force to the coating slot 152, and an adjustment member 1332 for controlling the output power of the force applying member 1331.

[0090] In these embodiments, at least one of the first adjustment mechanism 131 and the second adjustment mechanism 132 includes a plurality of adjustment portions 133 arranged along the width direction of the target substrate 14. The adjustment portion 133 includes a force applying member 1331 for applying a force to the coating slot 152, so that the adjustment mechanism 13 can apply different forces to different regions of the target substrate 14 in the width direction. In this way, the adjustment mechanism 13 can accurately adjust the slurry in different parts, thereby improving the coating quality of the coating system 1.

[0091] At least one of the first adjusting mechanism 131 and the second adjusting mechanism 132 comprises a plurality of adjusting portions 133 arranged along the width direction of the target substrate 14, specifically, both the first adjusting mechanism 131 and the second adjusting mechanism 132 comprise a plurality of adjusting portions 133 as shown in FIG. 3; or the first adjusting mechanism 131 comprises a plurality of adjusting portions 133 and the second adjusting mechanism 132 is an entirety; or the second adjusting mechanism 132 comprises a plurality of adjusting portions 133 and the first adjusting mechanism 131 is an entirety.

[0092] When the first adjusting mechanism 131 and the second adjusting mechanism 132 comprise a plurality of adjusting portions 133, the number of adjusting portions 133 in the first adjusting mechanism 131 and the second adjusting mechanism 132 is the same or different.

[0093] The adjusting member 1332 can be a valve or a rheostat, and the power of the force applying member 1331 can be adjusted through the adjusting member 1332.

[0094] The total size of the plurality of adjusting portions 133 along the width direction of the substrate is not less than the width of the target substrate 14, so that the adjusting portions 133 can adjust the slurry at different positions of the target substrate 14.

[0095] By adjusting the adjusting member 1332, the adjusting mechanism 13 can adjust the force of each adjusting portion 133 according to the slurry coating information at different positions of the target substrate 14. And through the adjusting member 1332, only part of the adjusting mechanism 13 can be started to adjust the slurry, reducing the power consumption of the coating system 1.

[0096] In some embodiments, as shown in FIG. 1, the coating system 1 further comprises a detection mechanism 16, and the adjusting mechanism 13 is arranged between the coating mechanism 12 and the detection mechanism 16. The detection mechanism 16 is used to obtain the slurry coating information of the target substrate 14, and the adjusting mechanism 13 is used to adjust the force acting on the coating slot 152 according to the slurry coating information.

[0097] In these embodiments, the coating system 1 further comprises a detection mechanism 16 capable of obtaining the slurry coating information of the target substrate 14, and the adjusting mechanism 13 can adjust the force acting on the coating slot 152 according to the slurry coating information, so as to improve the adjusting effect of the adjusting mechanism 13 on the slurry and improve the coating quality of the coating system 1.

[0098] The detection mechanism 16 is arranged downstream of the adjustment mechanism 13, and is configured to detect the target substrate 14 after the target substrate 14 is coated with the slurry, so as to obtain slurry coating information of the target substrate 14, which can include slurry thickness information or slurry weight information or slurry size information in the width direction of the target substrate 14 or slurry surface flatness information. The detection mechanism 16 can be a ray thickness gauge or a CCD (charge coupled device) camera or the like.

[0099] After the detection mechanism 16 obtains the slurry coating information, the adjustment mechanism 13 adjusts the slurry in the coating slot 152 according to the slurry coating information. Alternatively, due to periodic disturbance of the internal pressure of the coating mechanism 12 or other components, the slurry can form periodic fluctuations. The coating system 1 further includes a processing mechanism 17. The detection mechanism 16 transmits the slurry coating information to the processing mechanism 17. The processing mechanism 17 forms a periodic processing strategy according to the slurry coating information. The processing mechanism 17 transmits the periodic processing strategy to the adjustment mechanism 13. The adjustment mechanism 13 periodically applies a force to the slurry in the coating slot 152 according to the periodic processing strategy, so as to overcome the periodic fluctuations of the slurry.

[0100] Referring to FIG. 4, FIG. 4 is a flowchart of a coating method according to an embodiment of the present application.

[0101] In a second aspect, as shown in FIG. 1 and FIG. 4, the present application provides a coating method, which is applied to the coating system 1 of the first aspect of the present application. The coating method comprises the following steps.

[0102] In step S1, the coating mechanism 12 coats the target substrate 14 with the slurry.

[0103] In step S2, the first adjustment mechanism 131 and the second adjustment mechanism 132 apply a force to the slurry in the coating slot 152.

[0104] In the technical solution of the present application, when the coating mechanism 12 coats the target substrate 14 with the slurry, the first adjustment mechanism 131 and the second adjustment mechanism 132 jointly apply a force to the slurry in the coating slot 152. In this way, when the first adjustment mechanism 131 applies a force to the slurry in the coating slot 152, the second adjustment mechanism 132 can assist the first adjustment mechanism 131 to apply a force to the coating slot 152. In the case where the size and direction of the resultant force of the slurry in the coating slot 152 reach the expected target, the size of the force of the first adjustment mechanism 131 can be reduced, so as to improve the problem that the surface of the slurry can be corrugated due to the excessive force of the first adjustment mechanism 131 on the slurry, and the problem that the surface of the pole piece is textured. The coating quality of the coating system 1 is improved, and the performance of the pole piece is improved.

[0105] In step S2, the first adjusting mechanism 131 is configured to apply a force to the coating slit 152 or away from the coating slit 152, and the second adjusting mechanism 132 is configured to apply a force to the coating slit 152 or away from the coating slit 152, and the first adjusting mechanism 131 and the second adjusting mechanism 132 are configured to adjust the magnitude of the force.

[0106] In some embodiments, as shown in FIG. 1 and FIG. 4, the coating system 1 further comprises a detecting mechanism 16, the first adjusting mechanism 131 is configured to apply a first force F1 to the coating slit 152, and the second adjusting mechanism 132 is configured to apply a second force F2 to the coating slit 152, and step S2 comprises:

[0107] In step S21, the detecting mechanism 16 is configured to acquire slurry coating information of the target substrate 14.

[0108] In step S22, the first adjusting mechanism 131 is configured to apply a first force F1 to the slurry in the coating slit 152 according to the slurry coating information, and the second adjusting mechanism 132 is configured to apply a second force F2 to the slurry in the coating slit 152 according to the slurry coating information.

[0109] In these embodiments, the detecting mechanism 16 is configured to acquire slurry coating information of the target substrate 14, and the adjusting mechanism 13 is configured to adjust the force acting on the coating slit 152 according to the slurry coating information, so as to improve the adjusting effect of the adjusting mechanism 13 on the slurry and improve the coating quality of the coating system 1.

[0110] If the slurry coating information detected by the detecting mechanism 16 does not meet the expectation, the first adjusting mechanism 131 and / or the second adjusting mechanism 132 are adjusted in terms of the direction and magnitude of the force, so as to change the magnitude and direction of the resultant force of the adjusting mechanism 13 acting on the liquid bridge 151.

[0111] For example, the slurry coating information comprises slurry thickness information, if the slurry thickness detected by the detecting mechanism 16 is greater than the expected thickness, the first adjusting mechanism 131 and / or the second adjusting mechanism 132 are adjusted in terms of the direction and magnitude of the force, so as to increase the resultant force of the adjusting mechanism 13 acting on the first surface of the liquid bridge 151 and away from the conveying direction of the supporting mechanism 11.

[0112] In some embodiments, as shown in FIG. 1 and FIG. 4, the slurry coating information comprises a slurry thickness value, and step S22 comprises:

[0113] If the slurry thickness value is less than a preset slurry thickness value, the second adjusting mechanism 132 is configured to apply a second force F2 to the slurry in the coating slit 152 towards the coating slit 152, and the first adjusting mechanism 131 is configured to apply a first force F1 to the slurry in the coating slit 152 towards the coating slit 152, and the second force F2 is greater than the first force F1.

[0114] In these embodiments, if the slurry thickness value is less than the preset slurry thickness value, the second adjusting mechanism 132 applies a second force F2 to the slurry in the coating slot 152 to improve the problem of the slurry surface generating lines, the second adjusting mechanism 132 applies a second force F2 to the slurry in the coating slot 152 towards the coating slot 152, and the second force F2 is greater than the first force F1, so that the slurry in the coating slot 152 is subjected to a resultant force in the transmission direction, so that the target substrate 14 surface can cover thicker slurry, to improve the problem of the target substrate 14 surface slurry being too thin.

[0115] If the slurry thickness value obtained by the detection mechanism 16 is less than the expected thickness value, the adjusting mechanism 13 needs to increase the force acting on the liquid bridge 151 towards the second surface of the liquid bridge 151, or reduce the force acting on the liquid bridge 151 towards the first surface of the liquid bridge 151. At this time, the second adjusting mechanism 132 can be improved to act on the second surface of the liquid bridge 151 to achieve this, and the first force F1 can still be arranged towards the liquid bridge 151 in the coating slot 152, so that the first force F1 can be used to smooth the surface lines of the liquid bridge 151.

[0116] In some embodiments, as shown in FIGS. 1 and 4, the slurry coating information includes slurry surface information, which includes the following in step S22:

[0117] If the slurry surface has lines extending along the length direction of the target substrate 14, the first adjusting mechanism 131 reduces the first force F1 towards the coating slot 152;

[0118] If the slurry surface has lines extending along the width direction of the target substrate 14, the first adjusting mechanism 131 increases the first force F1 towards the coating slot 152.

[0119] In these embodiments, the first force F1 of the first adjusting mechanism 131 is adjusted according to the lines on the slurry surface by the above scheme to improve the problem of lines on the slurry surface affecting the quality of the pole piece.

[0120] If the detection mechanism 16 detects that the slurry surface has lines extending along the width direction of the target substrate 14, it means that the force of the first adjusting mechanism 131 acting on the liquid bridge 151 in the slot is insufficient, and the surface lines of the liquid bridge 151 caused by the structure in the coating mechanism 12 are not smoothed, at this time the first adjusting mechanism 131 can increase the first force F1 to improve the flatness of the slurry surface.

[0121] If the detection mechanism 16 detects that the surface of the slurry has a line extending along the length of the target substrate 14, it means that the first adjusting mechanism 131 exerts too much force on the liquid bridge 151 in the slot, and the first force F1 causes the surface of the liquid bridge 151 to have ripples, and then as the target substrate 14 moves, the ripples form a line extending along the length of the target substrate 14. At this time, the first adjusting mechanism 131 can be reduced to reduce the first force F1 to improve the flatness of the surface of the slurry.

[0122] In some embodiments, as shown in FIG. 1 and FIG. 4, the coating system 1 further comprises a processing mechanism 17, which is electrically connected with the detection mechanism 16 and the adjusting mechanism 13, and in step S22 comprises:

[0123] Step S221: Let the processing mechanism 17 form a processing strategy according to the slurry coating information;

[0124] Step S222: Let the first adjusting mechanism 131 and the second adjusting mechanism 132 periodically apply force to the slurry in the coating slot 152 according to the processing strategy.

[0125] In these embodiments, the processing mechanism 17 forms a processing strategy according to the slurry coating information, and the first adjusting mechanism 131 and the second adjusting mechanism 132 periodically apply force to the slurry in the coating slot 152 according to the processing strategy, to improve the problem that the coating quality of the pole piece does not meet the expected requirements due to the periodic fluctuations of the coating mechanism 12.

[0126] Due to the periodic disturbance of the internal pressure of the coating mechanism 12 or other components, the slurry will form periodic fluctuations, and the coating system 1 further comprises a processing mechanism 17, the slurry coating information obtained by the detection mechanism 16 is transmitted to the processing mechanism 17, the processing mechanism 17 forms a periodic processing strategy according to the slurry coating information, and the processing mechanism 17 transmits the periodic processing strategy to the adjusting mechanism 13, and the adjusting mechanism 13 periodically applies force to the slurry in the coating slot 152 according to the periodic processing strategy to overcome the periodic fluctuations of the slurry.

[0127] In some embodiments, as shown in FIGS. 1-4, the coating system 1 comprises a carrying mechanism 11 for carrying and conveying a target substrate 14, a coating mechanism 12 comprising a coating lip 121 facing the carrying mechanism 11, a coating slit 152 being provided between the coating lip 121 and the carrying mechanism 11 to enable the slurry flowing out of the coating lip 121 to be coated on the target substrate 14 by the coating slit 152, and an adjusting mechanism 13 comprising a first adjusting mechanism 131 and a second adjusting mechanism 132, the second adjusting mechanism 132 being disposed on a side of the coating slit 152 opposite to the first adjusting mechanism 131 along a conveying direction of the carrying mechanism 11, the first adjusting mechanism 131 being configured to apply a first force F1 to the coating slit 152, the first adjusting mechanism 131 being configured to apply the first force F1 to the coating slit 152 in a direction away from the conveying direction of the carrying mechanism 11, and the second adjusting mechanism 132 being configured to apply a second force F2 to the coating slit 152, the strength and direction of the second force F2 being adjustable, at least one of the first adjusting mechanism 131 and the second adjusting mechanism 132 being a pressure actuator comprising a pressure cavity and an output port in communication with each other, the output port being disposed towards the coating slit 152 to enable the output port to apply a positive pressure pushing force or a negative pressure suction force to the coating slit 152, or at least one of the first adjusting mechanism 131 and the second adjusting mechanism 132 being an electromagnetic actuator capable of applying an attractive force or a repulsive force to the coating slit 152, at least one of the first adjusting mechanism 131 and the second adjusting mechanism 132 comprising a plurality of adjusting portions 133 spaced apart along a width direction of the target substrate 14, each adjusting portion 133 comprising a force applying member 1331 configured to apply a force to the coating slit 152 and an adjusting member 1332 configured to control an output power of the force applying member 1331, the coating system 1 further comprising a detecting mechanism 16, the adjusting mechanism 13 being disposed between the coating mechanism 12 and the detecting mechanism 16, the detecting mechanism 16 being configured to acquire slurry coating information of the target substrate 14, and the adjusting mechanism 13 being configured to adjust the force applied to the coating slit 152 according to the slurry coating information.

[0128] In the scheme of the embodiment of the application, the coating system 1 comprises a bearing mechanism 11, a coating mechanism 12 and an adjusting mechanism 13. The bearing mechanism 11 is used to bear and convey the target substrate 14. The coating lip 121 of the coating mechanism 12 and the bearing mechanism 11 are provided with a coating slit 152. After the slurry leaks out of the coating lip 121, the slurry is coated on the target substrate 14 of the bearing mechanism 11 through the coating slit 152. The adjusting mechanism 13 comprises a first adjusting mechanism 131 and a second adjusting mechanism 132 which are separately arranged on both sides of the coating slit 152 along the conveying direction of the bearing mechanism 11. The first adjusting mechanism 131 and the second adjusting mechanism 132 are both used to apply force to the coating slit 152. In this way, when the first adjusting mechanism 131 applies force to the slurry in the coating slit 152, the second adjusting mechanism 132 can assist the first adjusting mechanism 131 to apply force to the coating slit 152. When the size and direction of the resultant force of the slurry in the coating slit 152 reach the expected target, the force of the first adjusting mechanism 131 can be reduced to improve the problem that the surface of the slurry will produce corrugation due to the excessive force of the first adjusting mechanism 131 on the slurry, so that the surface of the pole piece produces lines. The coating quality of the coating system 1 is improved, and the performance of the pole piece is improved.

[0129] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The 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 system comprising: A carrying mechanism, used for carrying and transporting a target substrate; a coating mechanism, comprising a coating lip facing the carrying mechanism, a coating slit being provided between the coating lip and the carrying mechanism, so that the slurry flowing out of the coating lip can be coated on the target substrate through the coating slit; The adjustment mechanism includes a first adjustment mechanism and a second adjustment mechanism. The second adjustment mechanism and the first adjustment mechanism are respectively arranged on both sides of the coating slit along the conveying direction of the supporting mechanism. The first adjustment mechanism and the second adjustment mechanism are both used to apply force to the coating slit.

2. The coating system according to claim 1, wherein: The first adjustment mechanism is used to apply a first force with adjustable strength to the coating slit, and / or the second adjustment mechanism is used to apply a second force with adjustable strength to the coating slit.

3. The coating system according to claim 2, wherein: The direction of the first force exerted by the first adjustment mechanism on the coating slit is adjustable, and / or the direction of the second force exerted by the second adjustment mechanism on the coating slit is adjustable.

4. The coating system according to claim 2, wherein: The first adjustment mechanism is located on one side of the second adjustment mechanism along the conveying direction of the carrying mechanism, and the first adjustment mechanism is used to apply a first force to the coating slit that is away from the conveying direction of the carrying mechanism.

5. The coating system according to any one of claims 1 to 4, wherein: At least one of the first adjustment mechanism and the second adjustment mechanism is a pressure actuator, the pressure actuator comprising a pressure chamber and an output port that are communicated with each other, the output port being arranged toward the coating slit so that the output port can apply a positive pressure thrust or a negative pressure suction to the coating slit; Alternatively, at least one of the first adjustment mechanism and the second adjustment mechanism is an electromagnetic actuator, and the electromagnetic actuator can apply an attractive force or a repulsive force to the coating slit.

6. The coating system according to any one of claims 1 to 5, wherein: At least one of the first adjustment mechanism and the second adjustment mechanism includes a plurality of adjustment parts spaced apart along the width direction of the target substrate, the adjustment parts including a force-applying member and an adjustment member, the force-applying member is used to apply a force to the coating slit, and the adjustment member is used to control the output power of the force-applying member.

7. The coating system according to any one of claims 1 to 6, wherein: The coating system further includes a detection mechanism, the adjustment mechanism is arranged between the coating mechanism and the detection mechanism, the detection mechanism is used to obtain the slurry coating information of the target substrate, and the adjustment mechanism is used to adjust the force acting on the coating slit according to the slurry coating information.

8. A coating method, applied to the coating system according to any one of claims 1 to 7, the coating method comprising: Instructing a coating mechanism to coat the slurry onto the target substrate; The first adjustment mechanism and the second adjustment mechanism apply a force to the slurry in the coating slit.

9. The coating method according to claim 8, wherein The coating system further includes a detection mechanism, the first adjustment mechanism is used to apply a first force to the coating slit, and the second adjustment mechanism is used to apply a second force to the coating slit. The step of "instructing the first adjustment mechanism and the second adjustment mechanism to apply a force to the coating slit" includes: Instructing the detection mechanism to obtain slurry coating information of the target substrate; The first adjustment mechanism applies the first force to the slurry in the coating slit according to the slurry coating information, and the second adjustment mechanism applies the second force to the slurry in the coating slit according to the slurry coating information.

10. The coating method according to claim 9, wherein The slurry coating information includes a slurry thickness value. The step of "instructing the first adjustment mechanism to apply the first force to the slurry in the coating slit according to the slurry coating information, and instructing the second adjustment mechanism to apply the second force to the slurry in the coating slit according to the slurry coating information" includes: If the slurry thickness value is less than the preset slurry thickness value, the second adjustment mechanism applies a second force toward the coating slit to the slurry in the coating slit, and the first adjustment mechanism applies a first force toward the coating slit to the slurry in the coating slit, and the second force is greater than the first force.

11. The coating method according to claim 9, wherein The slurry coating information includes slurry surface information. In the step of "instructing the first adjustment mechanism to apply the first force to the slurry in the coating slit according to the slurry coating information", If there are lines on the surface of the slurry extending along the length direction of the target substrate, the first adjustment mechanism reduces the first force toward the coating slit; If there are lines on the surface of the slurry extending along the width direction of the target substrate, the first adjustment mechanism is configured to increase the first force acting toward the coating slit.

12. The coating method according to claim 9, wherein The coating system further includes a processing mechanism, the processing mechanism being electrically connected to the detection mechanism and the adjustment mechanism, and the step of "instructing the first adjustment mechanism to apply the first force to the slurry in the coating slit according to the slurry coating information, and instructing the second adjustment mechanism to apply the second force to the slurry in the coating slit according to the slurry coating information" includes: Instructing the processing mechanism to form a processing strategy according to the slurry coating information; The first adjustment mechanism and the second adjustment mechanism are configured to periodically apply force to the slurry in the coating slit according to the processing strategy.

Images