Membrane processing equipment and solid electrolyte coating equipment

Abstract

The utility model belongs to the technical field of diaphragm processing, and discloses diaphragm processing equipment and solid electrolyte coating equipment, the processing equipment comprises at least one first passing roller, a second passing roller and a diaphragm, the first passing roller is arranged to provide driving force for the diaphragm and form a moving track of the diaphragm along the advancing direction; the second passing roller and the first passing roller are arranged corresponding to different surfaces of the membrane respectively, and net-shaped lines are formed on the surface of the second passing roller; a membrane running gap is formed between the second passing roller and the first passing roller, so that a membrane to be processed is in contact fit with the second passing roller in the membrane running gap; the diaphragm is partially arranged in the diaphragm operation gap, and the diaphragm is arranged on the surface of the second passing roller in an attached mode, so that the diaphragm to be machined forms a blank area corresponding to the position of the diaphragm in the operation process. According to the processing equipment, the diaphragm is utilized to enable the diaphragm to form a blank area, the blank area is prevented from being coated with paint, and the coating consistency and yield of the diaphragm can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of diaphragm processing, and particularly relates to a diaphragm processing device and a solid electrolyte coating device. Background Art

[0002] When coating and processing a diaphragm, a cutting area needs to be reserved on the diaphragm for easy cutting of the diaphragm. Among them, the reserved cutting area is not coated with paint to form a blank area. To avoid the blank area on the diaphragm being coated with paint, in the existing solution, adhesive strips are usually pre-pasted on the diaphragm and then coated. After removing the adhesive strips, a longitudinal whole blank area is obtained on the diaphragm. However, this solution consumes a lot of man-hours, and the cost of pre-pasting adhesive strips for each diaphragm is also relatively high.

[0003] Another existing solution is to design and improve the gravure roll for coating, so that part of the gravure roll is etched with patterns and part is not. The part with etched patterns can coat the diaphragm with paint, and the part without etched patterns can form a blank area on the diaphragm. However, in this solution, the paint may accumulate along the extending direction of the patterns. At the part without etched patterns, the paint will accumulate, affecting the consistency and yield rate of diaphragm coating, and still may cause unexpected coating on the blank area of the diaphragm. Summary of the Utility Model

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a diaphragm processing device and a solid electrolyte coating device.

[0005] In the first aspect of the present utility model, a diaphragm processing device is provided, including:

[0006] At least one first guide roller, the first guide rollers are spaced apart to provide driving force for the diaphragm and form the running track of the diaphragm along the advancing direction;

[0007] A second guide roller, the second guide roller and the first guide roller are respectively arranged corresponding to different surfaces of the diaphragm, and a mesh pattern is formed on the surface of the second guide roller; a diaphragm running gap is formed between the second guide roller and the first guide roller, so that the diaphragm to be processed is in contact and cooperation with the second guide roller in the diaphragm running gap;

[0008] A separator, part of the separator is arranged in the diaphragm running gap, and the separator in the diaphragm running gap is attached to the surface of the second guide roller, so that a blank area corresponding to the position of the separator is formed on the diaphragm to be processed during operation.

[0009] In addition, the diaphragm processing device of the present utility model may further have the following additional technical features:

[0010] Preferably, the diaphragm is arranged in a strip shape along the forward direction, and tensioning mechanisms are respectively arranged at both ends of the diaphragm, and the tensioning mechanisms are respectively arranged on both sides of the second roller, and the tensioning mechanisms are used to stretch and fix the diaphragm.

[0011] Preferably, the tensioning mechanism includes a support frame, a support shaft and a roller, the support frame is rotatably arranged with the support shaft, the roller is fixedly arranged on the support shaft, and the diaphragm is fixed on the surface of the roller so as to drive the diaphragm to be retracted and extended on the surface of the roller under the rotation of the support shaft.

[0012] Preferably, the tensioning mechanism further includes a driving member, and the driving member is connected to the support shaft to drive the support shaft to rotate circumferentially.

[0013] Preferably, the device also includes a diaphragm position adjustment mechanism, which includes a sliding slider and a slide rail. The slider is fixedly connected to the support frame, and the extension direction of the slide rail is perpendicular to the plane where the second roller rotates. The slider moves on the slide rail to adjust the position of the diaphragm.

[0014] Preferably, the stretching angle of the diaphragm is greater than the departure angle of the coating in the mesh pattern; wherein the stretching angle of the diaphragm is the angle between the stretching direction of the diaphragm by the tensioning mechanism and the running track of the diaphragm;

[0015] The departure angle of the paint in the mesh pattern is the angle between the line from the center point of the contact position between the second roller and the diaphragm to the edge of the paint position between the second roller and the diaphragm and the running track of the diaphragm.

[0016] Preferably, the device further comprises a deviation correction detection mechanism, and the deviation correction detection mechanism is used to detect the position of the blank area formed by the diaphragm to determine the diaphragm position corresponding to the blank area.

[0017] Preferably, the correction detection mechanism includes a laser signal transmitter and a laser signal receiver, the laser signal transmitter is used to emit a surface laser to the diaphragm forming the blank area, the surface laser covers the edge position of the diaphragm forming the blank area and the blank area, and the laser signal receiver is used to receive the surface laser to determine the edge position of the blank area of ​​the diaphragm.

[0018] Preferably, the second passing roller is arranged opposite to the first passing roller; or, the second passing roller is arranged staggered with the first passing roller.

[0019] Preferably, the diameter of the first roller is greater than the diameter of the second roller.

[0020] Preferably, the second over-roller includes a gravure roller or a micro-gravure roller; the diameter of the micro-gravure roller is 20 mm - 50 mm, and the diameter of the gravure roller is 125 mm - 250 mm.

[0021] In a second aspect of the present invention, there is provided a solid electrolyte coating device, which includes the film processing device according to any embodiment of the present application.

[0022] The film processing device and the solid electrolyte coating device provided by the present invention have a simple structure. By using the diaphragm to block part of the mesh patterns on the surface of the second over-roller, when the second over-roller coats the film within the running gap of the film, a blank area corresponding to the position of the diaphragm is formed on the surface of the film, avoiding coating the blank area with the coating. The cost is low, and there will be no phenomenon of coating accumulation in the mesh patterns, improving the consistency and yield rate of film coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0024] Figure 1 It is the first structural diagram of the film processing device provided by the embodiment of the present application;

[0025] Figure 2 is Figure 1 the side view of the film processing device in

[0026] Figure 3 is Figure 1 the connection schematic diagram of the tensioning mechanism and the diaphragm position adjusting mechanism in

[0027] Figure 4 It is the exemplary structural diagram of the diaphragm position adjusting mechanism provided by the embodiment of the present application;

[0028] Figure 5 It is the second structural diagram of the film processing device provided by the embodiment of the present application;

[0029] Figure 6 It is the third structural diagram of the film processing device provided by the embodiment of the present application;

[0030] Figure 7 It is the comparison diagram of the departure angles of the micro-gravure roller and the gravure roller provided by the embodiment of the present application;

[0031] Figure 8 It is the exemplary structural diagram of the solid electrolyte coating device provided by the embodiment of the present application.

[0032] In the above figures:

[0033] 110 The first over-roller; 120 The second over-roller; 121 The micro-engraved roller; 122 The engraved roller; 130 The diaphragm; 140 The tensioning mechanism; 141 The support frame; 142 The support shaft; 143 The roller; 150 The diaphragm position adjusting mechanism; 151 The slider; 152 The slide rail; 160 The deviation rectifying detection mechanism; 170 The diaphragm; 171 The blank area; 172 The coating area; 180 The feeding trough; 190 The scraper. Detailed implementation manners

[0034] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. Additionally, it should be noted that for the sake of description, only the parts related to the utility model are shown in the drawings.

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0036] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0037] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is interpreted as an open, inclusive meaning, that is, "including, but not limited to".

[0038] In the description of the specification, the terms "an embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples", etc., are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0039] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality" is two or more.

[0040] During the manufacturing process of lithium batteries, when coating the electrode sheet / composite electrode sheet, it is necessary to form a uniform and ultra-thin precision coating (such as at the μm level) on the metal foil (current collector). The microgravure coating technology can be used to coat the metal foil to form a precision coating. A typical application scenario is that during the preparation process of solid-state batteries, in a solid-state electrolyte introduction process, a coating formed by a solid-state electrolyte is applied to the surface of the electrode sheet using a gravure / microgravure roll, so as to facilitate the formation of a good interfacial contact between the solid-state electrolyte and the active material in the electrode sheet.

[0041] For the consideration of production efficiency, the width during the coating of the electrode roll is often larger than the width of the electrode sheet of the battery cell, and then it is slit into small electrode rolls of the required specification size in the subsequent slitting process. Therefore, a cutting area needs to be reserved on the metal foil between the small electrode rolls, and the cutting area is not coated with the coating to form a blank area 171, so as to facilitate cutting the cutting area to form electrode rolls of the required size specification, and even to form electrode tabs. This technical problem also exists in the stage of the solid-state electrolyte introduction process. The slurry of the solid electrolyte can be coated slightly larger than the area of the active material, but the blank area 171 still needs to be reserved.

[0042] To avoid the blank area 171 on the metal foil being contaminated by the coating, in the existing microgravure coating, a removable rubber strip / thermosensitive metal film is usually pre-pasted on the metal foil of the electrode roll, and then coated. After removing the rubber strip / film, a longitudinal whole blank area 171 is obtained on the electrode roll. However, this technology has cumbersome operations, consumes a lot of man-hours, and the cost of pre-pasting rubber strips for each electrode roll is also relatively large. Another solution is to improve the gravure roll of the gravure coating. The gravure roll does not adopt the full-width etched pattern method, but partially etches the pattern, and the remaining part is not etched. For example, in the coating of a 4-in-1 electrode roll, the middle part of the gravure roll is not etched, and the remaining part is etched. However, in this solution, when the gravure roll coats the metal foil of the electrode roll, the coating may accumulate along the direction of the pattern extension. When the corresponding pattern is not etched in the middle part, the coating will accumulate in the middle part of the gravure roll, affecting the coating consistency and the yield rate, and may still cause unexpected coating on the blank area 171 of the electrode roll.

[0043] To solve the above technical problems, as Figures 1 to 6 shown, in the first aspect of the present utility model, a membrane processing device is provided, including:

[0044] At least one first guide roll 110, the first guide roll 110 is arranged to provide a driving force for the membrane 170 and form a running track of the membrane 170 along the advancing direction;

[0045] A second passing roller 120, the second passing roller 120 and the first passing roller 110 are respectively arranged corresponding to different surfaces of the diaphragm 170, and a mesh pattern is formed on the surface of the second passing roller 120; A diaphragm running gap is formed between the second passing roller 120 and the first passing roller 110, so that the diaphragm 170 to be processed is in contact and cooperation with the second passing roller 120 within the diaphragm running gap;

[0046] A separator 130, a part of the separator 130 is arranged within the diaphragm running gap, and the separator 130 within the diaphragm running gap is attached to the surface of the second passing roller 120, so that a blank area 171 corresponding to the position of the separator 130 is formed on the diaphragm 170 during operation.

[0047] Specifically, the first passing roller 110 provides driving force for the diaphragm 170 and forms the running track of the diaphragm 170 in the forward direction. The first passing roller 110 is preferably a soft roller made of rubber to avoid damaging the diaphragm 170. The first passing roller 110 is one or more, and each first passing roller 110 is arranged at intervals and forms the running track of the diaphragm 170 in the forward direction. The diameters of the first passing rollers 110 are the same or different. For example, a plurality of first passing rollers 110 are arranged at intervals in the same direction, and the axes of each first passing roller 110 are arranged in parallel, so that the plurality of first passing rollers 110 rotate to provide the driving force for the diaphragm 170 to move forward along the surfaces of the plurality of first passing rollers 110. Exemplarily, as Figure 1 shown, there are two first passing rollers 110, the two first passing rollers 110 are arranged at intervals and form the running track of the diaphragm 170, and the diameters of the two first passing rollers 110 are different. In addition, the first passing roller 110 is not limited to a soft roller made of rubber, and can be a rigid tension roller to facilitate tensioning the diaphragm 170. Preferably, each first passing roller 110 is arranged at intervals in the same direction to form a linear running track of the diaphragm 170.

[0048] Exemplarily, the diaphragm 170 can be a battery electrode plate already coated with an active material, such as a positive electrode plate or a negative electrode plate.

[0049] The second over-roller 120 and the first over-roller 110 are respectively arranged corresponding to two surfaces of the diaphragm 170 arranged oppositely. For example, the second over-roller 120 and the first over-roller 110 can be at different horizontal heights, such that the horizontal height of the second over-roller 120 is less than that of the first over-roller 110, that is, each first over-roller 110 is located above the second over-roller 120. Both the first over-roller 110 and the second over-roller 120 can perform circumferential rotational motion. A diaphragm running gap is formed between the end faces on the side where the first over-roller 110 and the second over-roller 120 are close to each other. The thickness of the diaphragm 170 to be processed is adapted to the diaphragm running gap, so that the diaphragm 170 to be processed can pass through the diaphragm running gap, and the two end faces of the diaphragm 170 to be processed are respectively in contact and cooperation with the first over-roller 110 and the second over-roller 120, so that the diaphragm 170 to be processed is driven by the first over-roller 110 and the second over-roller 120 to run along the diaphragm running track at a set speed.

[0050] Wherein, the surface of the second over-roller 120 has a reticular texture, and the reticular texture can be slender stripe-shaped textures etched on the surface of the second over-roller 120. In gravure / microgravure coating, the rotation direction of the second over-roller 120 is opposite to that of the first over-roller 110. The second over-roller 120 passes through the feed tank 180 and passes through the doctor blade 190 to remove the excess coating, so that the reticular texture stores the coating, so that when the diaphragm 170 to be processed is in contact and cooperation with the second over-roller 120 in the diaphragm running gap, the coating can be evenly applied to the surface of the diaphragm 170.

[0051] Wherein, the reticular texture etched on the surface of the second over-roller 120 is full-width etching. The coating stored in the reticular texture can be transferred to the diaphragm 170 when the second over-roller 120 rotates. The rotation speed of the second over-roller 120 is set so that the coating is evenly coated on the side surface of the diaphragm 170 in a way of being thrown out. Exemplarily, for a battery electrode plate, the coating can be a solid electrolyte material, such as an inorganic material. Since the reticular texture on the surface of the second over-roller 120 adopts full-width etching, the accumulation of the coating along the texture extension direction of the reticular texture can be avoided during coating, thereby ensuring the consistency of the coating of the diaphragm 170 and improving the yield.

[0052] Such as Figure 1 、 Figure 5 and Figure 6As shown, the diaphragm 130 is partially fixedly arranged within the diaphragm running gap, and the remaining part of the diaphragm 130 is arranged outside the diaphragm running gap. The diaphragm 130 fixed within the diaphragm running gap is in contact and cooperation with the surface of the second over-roller 120, enabling the diaphragm 130 to adhere to the surface of the second over-roller 120. During the circumferential rotation of the second over-roller 120, the diaphragm 170 always remains within the diaphragm running gap and stationary, so as to block part of the reticular pattern on the surface of the second over-roller 120 located within the diaphragm running gap. When the diaphragm 170 to be processed runs within the diaphragm running gap, the coating material within the unblocked reticular pattern on the second over-roller 120 coats the diaphragm 170 to be processed to form a coating area 172, and when the reticular pattern on the second over-roller 120 blocked by the diaphragm 130 coats the diaphragm 170 to be processed, a blank area 171 will be formed. Among them, the blank area 171 of the diaphragm 170 does not need to be coated with the coating material, and the setting of the blank area 171 facilitates the cutting of the diaphragm 170 to cut out the diaphragm 170 of the required size. Among them, the diaphragm 130 can be a polyethylene terephthalate film (PET film). If the diaphragm 170 is a battery electrode plate, the blank area 171 of the battery electrode plate is convenient for cutting to form the battery electrode plate of the required size, and it is also convenient to form tabs in the blank area 171.

[0053] The diaphragm processing equipment provided by the present utility model has a simple structure. By fixedly arranging the diaphragm 130 within the diaphragm running gap formed by the first over-roller 110 and the second over-roller 120 to block part of the reticular pattern on the surface of the second over-roller 120, when the second over-roller 120 coats the diaphragm 170 within the diaphragm running gap, it is convenient to form a blank area 171 corresponding to the position of the diaphragm 130 on the surface of the diaphragm 170, avoiding coating the blank area 171 with the coating material. It has a low cost and there will be no phenomenon of coating material accumulation in the reticular pattern, improving the coating consistency and the yield rate of the diaphragm 170.

[0054] It should be noted that the rotation direction of the second over-roller 120 is opposite to that of the first over-roller 110, that is, the linear velocity direction of the rotation of the second over-roller 120 within the diaphragm running gap is opposite to the running direction of the diaphragm 170. Exemplarily, as Figure 1 shown, if the diaphragm 170 runs towards the right, then the second over-roller 120 rotates counterclockwise. During reverse coating, due to the different movement directions of the second over-roller 120 and the diaphragm 170, a shear force will be generated, and there will be no wire drawing and small droplets, making the coating of the diaphragm 170 more uniform and improving the coating consistency of the diaphragm 170.

[0055] In some embodiments, such as Figures 1 to 3As shown, the diaphragm 130 is arranged in a strip shape along the forward direction, and tensioning mechanisms 140 are respectively arranged at both ends of the diaphragm 130. The tensioning mechanisms 140 are respectively arranged on both sides of the second roller 120, and the tensioning mechanisms 140 are used to stretch and fix the diaphragm 130.

[0056] Specifically, tensioning mechanisms 140 are respectively arranged on both sides of the second roller 120 along the running track direction of the diaphragm 170, and the two tensioning mechanisms 140 are respectively fixedly connected to the two ends of the strip-shaped diaphragm 130 to stretch and fix the diaphragm 130 located in the running gap of the diaphragm, to ensure that the diaphragm 130 remains stationary and in contact with the second roller 120 during the rotation of the second roller 120, and with the cooperation of the first roller 110, the second roller 120 and the tensioning mechanism 140, the diaphragm 170 and the diaphragm 130 can fully contact during the operation of the diaphragm 170, thereby forming a blank area 171 at a position on the diaphragm 170 corresponding to the diaphragm 130 to prevent the blank area 171 from being coated with paint.

[0057] The tensioning mechanism 140 is arranged to tilt the stretching direction of the diaphragm 130 and the running direction of the diaphragm 170, and the angle between the stretching direction of the diaphragm 130 and the running direction of the diaphragm 170 is less than 90°, preferably 30-60°, and illustratively, 45°. By tilting, stretching and fixing the diaphragm 130, the diaphragm 130 located in the running gap of the diaphragm can be more firmly attached to the surface of the second roller 120, so as to effectively block the mesh texture at the second roller 120 running to the bonding position, thereby ensuring that the blank area 171 of the diaphragm 130 is not coated with paint.

[0058] In some embodiments, Figures 1 to 3 As shown, the tensioning mechanism 140 includes a support frame 141, a support shaft 142 and a roller 143. The support frame 141 is rotatably arranged with the support shaft 142, the roller 143 is fixedly arranged on the support shaft 142, and the diaphragm 130 is fixed on the surface of the roller 143 to drive the diaphragm 130 to be retracted and extended on the surface of the roller 143 under the rotation of the support shaft 142.

[0059] Specifically, both ends of the support shaft 142 are rotatably connected to the support frame 141 through bearings. A roller 143 is fixedly installed in the middle of the support shaft 142. The roller 143 rotates as the support shaft 142 rotates. The diaphragm 130 is wound around the surface of the roller 143. The support shaft 142 rotates forward or backward to drive the roller 143 to rotate, thereby driving the diaphragm 130 on the surface of the roller 143 to be wound and unwound, so as to adjust the tension of the diaphragm 130 in the diaphragm running gap, so that the diaphragm 130 in the diaphragm running gap can firmly adhere to the surface of the second idler roller 120, effectively blocking the reticular pattern on the surface of the second idler roller 120 at the diaphragm running gap, and ensuring that the blank area 171 of the diaphragm 130 is not coated with paint.

[0060] In some embodiments, the tensioning mechanism 140 further includes a driving member, and the driving member is connected to the support shaft 142 to drive the support shaft 142 to rotate circumferentially.

[0061] Specifically, at least one end of the support shaft 142 extends out of the support frame 141 and is connected to the driving member. The driving member can drive the support shaft 142 to rotate forward or backward, thereby realizing the winding and unwinding operation of the diaphragm 130. Among them, the driving member can be a motor, a handle, etc.

[0062] In some embodiments, as Figures 1 to 4 shown, the device further includes a diaphragm position adjusting mechanism 150. The diaphragm position adjusting mechanism 150 includes a slider 151 and a slide rail 152 that are slidably matched. The slider 151 is fixedly connected to the support frame 141. The extending direction of the slide rail 152 is perpendicular to the plane where the rotation direction of the second idler roller 120 is located. The slider 151 moves on the slide rail 152 to adjust the position of the diaphragm 130.

[0063] The diaphragm 170 generally has different requirements for the blank area 171 of different specifications to meet the cutting requirements of diaphragms 170 of different sizes and adapt to the requirements of battery models of different size specifications. In the existing method, by designing and improving the gravure roll, some parts of the gravure roll are etched with patterns and some are not. The etched parts can coat the diaphragm 170 with paint, and the unetched parts can form a blank area 171 on the diaphragm 170. However, this solution cannot adapt to the requirements of the blank area 171 of the diaphragm 170 with different size specifications, and different specifications of gravure rolls need to be formulated to adapt to the diaphragm 170 with different specifications of the blank area 171.

[0064] In the embodiment of the present application, the diaphragm position adjusting mechanism 150 includes a slider 151 and a slide rail 152. The extending direction of the slide rail 152 is perpendicular to the plane where the rotation direction of the first over-roller 110 or the second over-roller 120 is located. One end of the slider 151 is fixedly connected to the support frame 141, and the other end of the slider 151 moves linearly along the slide rail 152 to adjust the position of the diaphragm 130 within the film running gap, and further, the position of the blank area 171 of the film 170 can be adjusted to adapt to the film 170 with different specifications of the blank area 171. When adjusting the position of the blank area 171 of the film 170, there is no need to replace the second over-roller 120 of different models. By adjusting the position and tension of the diaphragm 130 through the diaphragm position adjusting mechanism 150 and the tensioning mechanism 140, the coating requirements of the film 170 with different specifications of the blank area 171 can be met, and the operation is simple and the flexibility is strong. Wherein, a chute can be opened on the slide rail 152, and the slider 151 is slidably connected to the slide rail 152 through the chute. A driving part such as a motor is connected to the slider 151 to drive the slider 151 to move linearly on the slide rail 152.

[0065] In some embodiments, the stretching angle of the diaphragm 130 is greater than the departure angle of the coating within the mesh pattern; wherein,

[0066] The stretching angle of the diaphragm 130 is the included angle between the stretching direction of the tensioning mechanism 140 on the diaphragm 130 and the running track of the film 170;

[0067] The departure angle of the coating within the mesh pattern is the included angle between the connection line from the center point of the contact position between the second over-roller 120 and the film 170 to the edge of the coating position between the second over-roller 120 and the film 170 and the running track of the film 170.

[0068] Specifically, the film 170 runs according to the running track of the film 170, that is, the running direction of the film 170 is the same as the running track of the film 170. The stretching angle of the diaphragm 130 is the included angle between the stretching direction of the tensioning mechanism 140 on the diaphragm 130 and the running direction of the film 170 within the film running gap. The departure angle of the coating within the mesh pattern is the included angle between the connection line from the center point of the contact position between the second over-roller 120 and the film 170 to the edge of the coating position between the second over-roller 120 and the film 170 and the running direction of the film 170 within the film running gap.

[0069] In this example, the stretching angle of the diaphragm 130 is greater than the departure angle of the coating within the reticular texture. At the position corresponding to the diaphragm 130 within the film running gap of the second over-roller 120, the elastic hydrodynamic contact effect required for coating cannot be generated. At this position, the diaphragm 130 replaces the film 170, thereby enabling the blank area 171 on the film 170 to be more thoroughly separated from the coated area 172 at the edge of the film 170, and the coated area 172 can be better coated, ensuring the coating consistency of the film 170 and improving the yield rate of the film 170.

[0070] Among them, the width of the diaphragm 130 does not exceed the width of the reserved blank area 171 on the film 170. For example, the width of the diaphragm 130 is 1 - 5 mm smaller than the width of the reserved blank area 171 on the film 170. For example, the width of the diaphragm 130 is 32 - 36 mm, and the width of the reserved blank area 171 on the film 170 is 37 mm, such that the diaphragm 130 does not need to completely cover the reserved blank area 171 on the film 170, and coating can be applied outside the position covered by the diaphragm 130, which can better ensure safety and the performance of the battery.

[0071] In some embodiments, as Figure 1 shown, the device further includes a deviation correction detection mechanism 160. The deviation correction detection mechanism 160 is used to detect the position of the blank area 171 formed by the film 170 to determine the position of the diaphragm 130 corresponding to the blank area 171.

[0072] Specifically, the film 170 to be processed passes through the film running gap between the first over-roller 110 and the second over-roller 120, forming a blank area 171 opposite to the position of the diaphragm 130 and a coated area 172 formed by coating. The deviation correction detection mechanism 160 can determine whether the position of the diaphragm 130 within the film running gap is appropriate by detecting the boundary line of the blank area 171 to meet the cutting requirements of the film 170 with different specifications of blank areas 171.

[0073] In some embodiments, the deviation correction detection mechanism 160 includes a laser signal emitter and a laser signal receiver. The laser signal emitter is used to emit surface laser to the film 170 forming the blank area 171. The surface laser covers the edge position of the film 170 forming the blank area 171 and the blank area 171. The laser signal receiver is used to receive the surface laser to determine the edge position of the blank area 171 of the film 170.

[0074] Specifically, the laser signal transmitter and the laser signal receiver are arranged on the front and back sides of the diaphragm 170. The laser signal transmitter can emit surface laser onto the diaphragm 170, and the surface laser covers at least the blank area 171 and the coating area 172 of the diaphragm 170. The brightness of the laser signals corresponding to the blank area 171 and the coating area 172 is different. The closer to the coating area 172, the weaker the brightness of the corresponding laser signal; the closer to the blank area 171, the stronger the brightness of the corresponding laser signal. The laser signal receiver can receive the surface laser emitted by the laser transmitter, and the edge position of the blank area 171 can be determined according to the intensity of the received surface laser, and then whether the position of the separator 130 is appropriate can be determined.

[0075] The signal output end of the deviation correction detection mechanism 160 is electrically connected to the signal input end of the driving member. If the deviation correction detection mechanism 160 detects that the position of the blank area 171 of the diaphragm 170 is inappropriate, the position of the separator 130 is adjusted through the driving control member to meet the position requirements of the blank area 171 of different specifications of the diaphragm 170, and ensure that the position of the adjusted separator 130 meets the preset position requirements of the blank area 171 of the diaphragm 170.

[0076] In some embodiments, the second over-roller 120 is disposed opposite to the first over-roller 110; or, the second over-roller 120 is disposed offset from the first over-roller 110.

[0077] Specifically, as Figure 5 shown, if there is one first over-roller 110, the second over-roller 120 is disposed opposite to the first over-roller 110, that is, the first over-roller 110 is located directly above the second over-roller 120, and a diaphragm running gap is formed between the first over-roller 110 and the second over-roller 120. The positive pressure of the first over-roller 110 (equivalent to the back roller) enables the diaphragm 170 to be processed to be in full contact with the first over-roller 110 and the second over-roller 120 in the diaphragm running gap, increasing the contact area between the diaphragm 170 to be processed and the second over-roller 120, so that more coating on the surface of the second over-roller 120 can be transferred onto the diaphragm 170 to be processed to form a uniform coating.

[0078] If there are multiple first over-rollers 110, the multiple first over-rollers 110 are arranged at intervals in the same direction. Among them, one first over-roller 110 is disposed opposite to the second over-roller 120, and the remaining first over-rollers 110 are respectively disposed offset from the second over-roller 120; or, multiple second over-rollers 120 are respectively disposed offset from the first over-roller 110. Hereinafter, an example with two first over-rollers 110 will be described:

[0079] Exemplarily, as Figure 1As shown, there are two first over rollers 110, namely over roller a and over roller b respectively. The second over roller 120 is disposed opposite to over roller a and is offset from over roller b. The specific way of the opposite setting is the same as above and will not be elaborated in this application. The central connection line between the first over roller 110 and the second over roller 120 is perpendicular to the running direction of the diaphragm 170.

[0080] Exemplarily, as Figure 6 shown, the second over roller 120 is respectively offset from the two first over rollers 110. For example, there are two first over rollers 110, namely over roller a and over roller b respectively. Over roller a and over roller b are arranged at intervals in the same direction, and their diameters are the same or different (such as the diameter of over roller a is greater than that of over roller b). The diaphragm 170 can run along the running track of the diaphragm 170 formed by over roller a and over roller b. The linear velocity direction of the rotation of the second over roller 120 is opposite to the running direction of the diaphragm 170, so that the second over roller 120 can slightly contact the diaphragm 170, and the second over roller 120 coats the diaphragm 170 in a kiss coating manner, avoiding problems such as wrinkles generated on the diaphragm 170 due to improper pressure of the first over roller 110 when they are oppositely arranged, and improving the coating uniformity of the diaphragm 170.

[0081] It should be noted that if the diaphragm 170 is a battery electrode sheet, due to the height difference between the tab position (blank area 171) and the coating area 172 of the battery electrode sheet, the separator 130 can compensate for the height difference between the tab and the coating area 172, and combined with the opposite setting of the first over roller 110 and the second over roller 120, the first over roller 110 applies a positive pressure to the diaphragm 170, which is beneficial to the contact between the separator 130 and the battery electrode sheet and can better coat the battery electrode sheet. Among them, the thickness of the separator 130 is the same as the thickness of the coating on the coating area 172. The thickness of the separator 130 is 10 - 150 μm. Exemplarily, such as the thickness of the separator 130 is 94 μm and the thickness of the battery electrode sheet is 110 μm.

[0082] In some embodiments, as Figure 1 、 Figure 5 and Figure 6 shown, the diameter of the first over roller 110 is greater than the diameter of the second over roller 120.

[0083] Specifically, as Figure 1 and Figure 5 shown, the diameter of the first over roller 110 opposite to the second over roller 120 is greater than the diameter of the second over roller 120, so that the contact area between the diaphragm 170 and the second over roller 120 increases, and more coating on the second over roller 120 can be transferred to the diaphragm 170, thereby improving the coating efficiency and quality.

[0084] Or, as Figure 6As shown, the diameter of the first roller 110 staggered with the second roller 120 is larger than the diameter of the second roller 120. Since the diameter of the second roller 120 is smaller and there is no back roller, the amount of liquid bridge of the film 170 to be processed entering and leaving the coating area is very small and relatively stable, which is beneficial to improving the quality of transfer coating and improving the consistency of coating of the film 170.

[0085] In some embodiments, Figure 7 As shown, the second roller 120 includes a gravure roller 122 or a micro gravure roller 121 .

[0086] Specifically, the second roller 120 is a gravure roller 122, and a pattern or groove is engraved on the surface of the gravure roller 122, and the pattern or groove forms a mesh pattern. High-precision bearings are installed at both ends of the gravure roller 122, and one end of the gravure roller 122 is connected to a servo motor through an elastic coupling to drive the gravure roller 122 to rotate in a circumferential direction. The gravure roller 122 is coated with the film 170 to be processed by gravure coating. The mesh pattern on the surface of the gravure roller 122 is generally formed by electroplating, and the mesh pattern is formed by electroplating nickel, chromium and other materials, and the pit depth of the mesh pattern is generally within 80μm.

[0087] Alternatively, the second roller 120 is a micro gravure roller 121, and the diameter of the micro gravure roller 121 is smaller than the diameter of the gravure roller. For example, the diameter of the micro gravure roller 121 is 20 mm-50 mm, and the diameter of the gravure roller 122 is 125 mm-250 mm. The small-diameter micro gravure roller 121 has a very small contact area with the film 170 during coating, and does not press the back roller. Therefore, the amount of liquid bridge for the film 170 to be processed to enter and leave the coating area is very small and relatively stable, which is conducive to improving the quality of transfer coating and improving the consistency of coating of the film 170. The micro gravure roller 121 coats the film 170 to be processed in a micro gravure coating manner. As a type of gravure coating, micro gravure coating belongs to roller coating. In the micro-concave coating method, the diaphragm 170 is equivalent to a deformable solid, and the coating is the fluid therein; the micro-concave coating method can coat a thin layer with better uniformity, because the micro-concave coating method uses an elastohydrodynamic contact system (EHD), and its coating gap is no longer affected by the back roller processing accuracy. The coating gap is mainly determined by the tension of the diaphragm 170 and the position of the first roller 110 that matches the second roller 120. The micro-concave roller 121 adopts a ceramic roller, and the mesh texture on the surface of the micro-concave roller 121 is generally formed by laser engraving. The pit depth of the mesh texture is generally above 80μm, such as 85~120μm, and exemplary, such as 90μm, 110μm, 120μm, etc.

[0088] It should be noted that if Figure 7As shown, the coating departure angle of the micro gravure roll 121 is greater than that of the gravure roll 122. In the embodiments of the present application, it is preferably to use the micro gravure roll 121 to coat the diaphragm 170 to improve the coating consistency of the diaphragm 170, and further improve the yield rate of the diaphragm 170.

[0089] In the second aspect of the present invention, a solid electrolyte coating device is provided, and the device includes the diaphragm processing device according to any embodiment of the present application.

[0090] Specifically, the specific technical features and technical effects of the solid electrolyte coating device are the same as those of the diaphragm processing device, and will not be elaborated in the present application.

[0091] It can be understood that, as Figure 8 shown, a feed trough 180 is provided below the second idler roll 120. A part of the second idler roll 120 is located inside the feed trough 180, and a part is located outside the feed trough 180. The feed trough 180 is filled with coatings such as solid electrolyte materials, such as solutions of inorganic materials. During the rotation of the second idler roll 120, the coatings in the feed trough 180 are carried up by the mesh pattern, and then the diaphragm 170 is coated. During the coating of the diaphragm 170, part of the coatings are transferred from the second idler roll 120 to the diaphragm 170, and the remaining part of the coatings still remain in the mesh pattern on the surface of the second idler roll 120. Among them, introducing inorganic materials onto the battery electrode plate enables the battery electrode plate to effectively maintain a stable circuit state between the positive electrode and the negative electrode, enabling the solid-state lithium battery to work properly. The inorganic materials can effectively reduce the internal resistance between the positive electrode and the negative electrode in the battery, improving the safety of the battery during the charging and discharging processes. Among them, the thickness of the coating applied to the diaphragm 170 by the second idler roll 120 is related to the pit depth of the mesh pattern on the surface of the second idler roll 120, the number of engraving lines of the mesh pattern on the surface of the second idler roll 120, the solid content concentration of the coatings in the feed trough 180, etc.

[0092] In order to remove the excessive coatings carried by the second idler roll 120 from the feed trough 180, the solid electrolyte coating device further includes a squeegee 190 to scrape off the excess coatings on the surface of the second idler roll 120, as Figure 8As shown in the figure. Among them, the movement process of the coating in the feeding tank 180 is divided into contact, shearing, and extraction. That is, during the rotation of the second over-roller 120, the mesh pattern contacts and picks up the liquid in the feeding tank 180. Then, the doctor blade 190 shears the excess coating on the surface of the second over-roller 120. After being quantified by the doctor blade 190, the excess coating on the surface of the second over-roller 120 is scraped clean, and a certain volume of coating is retained in the mesh pattern. When the surface of the second over-roller 120 with a quantified coating contacts the reversely running diaphragm 170, a wetting line will be formed at the contact position, and the coating will wet the diaphragm 170 under the action of surface tension. The coating in the mesh pattern on the surface of the second over-roller 120 is taken out due to viscosity, and then transferred to the surface to be wetted and spread, realizing a uniform ultra-thin coating. Among them, the doctor blade 190 used for the micro gravure roller 121 is softer and has a smaller pressure than the doctor blade 190 of the ordinary gravure roller 122. The scraping angle of the doctor blade 190 is approximately a tangent angle, mainly playing the role of homogenization and quantification, while the doctor blade 190 of the ordinary gravure roller 122 focuses more on the scraping function.

[0093] The solid electrolyte coating method of the present utility model includes:

[0094] S210: The diaphragm 170 to be processed passes through the diaphragm running gap between the first over-roller 110 and the second over-roller 120, and the two opposite surfaces of the diaphragm 170 are respectively matched with the first over-roller 110 and the second over-roller 120 in the diaphragm running gap;

[0095] S220: The first over-roller 110 provides the driving force for the diaphragm 170 to make the diaphragm 170 run forward;

[0096] S230: The mesh pattern on the surface of the second over-roller 120 stores a solid electrolyte coating. Among them, the diaphragm 130 located in the diaphragm running gap blocks a part of the mesh pattern on the surface of the second over-roller 120. The rotation of the second over-roller 120 makes the solid electrolyte coating in the unblocked mesh pattern transfer to the diaphragm 170 to coat the diaphragm 170; the solid electrolyte coating in the blocked mesh pattern of the second over-roller 120 cannot coat the diaphragm 170, and a blank area 171 opposite to the position of the diaphragm 130 is formed on the diaphragm 170.

[0097] Specifically, the diaphragm 170 to be processed passes through the diaphragm running gap between the first over-roller 110 and the second over-roller 120, and runs forward under the drive of the first over-roller 170. The two opposite surfaces of the diaphragm 170 to be processed are respectively in contact and cooperation with the first over-roller 110 and the second over-roller 120 in the diaphragm running gap.

[0098] The second over-roller 120 passes through the feeding trough 180 and passes through the scraper 190 to remove the excess solid electrolyte coating, so that the solid electrolyte coating is stored in the mesh pattern. The separator 130 located in the running gap of the diaphragm covers a part of the mesh pattern on the surface of the second over-roller 120. The solid electrolyte coating in the covered mesh pattern of the second over-roller 120 cannot coat the diaphragm 170, and a blank area 171 opposite to the position of the separator 130 is formed on the diaphragm 170. The second over-roller 120 rotates to evenly apply the solid electrolyte coating in the uncovered mesh pattern on the surface of the diaphragm 170, so that a coating area 172 is formed on the diaphragm 170.

[0099] The solid electrolyte coating equipment provided by the embodiment of the present application is used to execute the solid electrolyte coating method provided by the embodiment of the present application. The technical effects and technical features corresponding to the coating method are consistent with those of the coating equipment, and will not be elaborated in the present application.

[0100] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept of the utility model. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A diaphragm processing device, characterized in that, Comprising: At least one first over-roller (110), the first over-roller (110) being arranged to provide a driving force for the diaphragm (170) and form the running track of the diaphragm (170) along the advancing direction; A second over-roller (120), the second over-roller (120) and the first over-roller (110) being respectively arranged corresponding to different surfaces of the diaphragm (170), a net-like texture being formed on the surface of the second over-roller (120); a diaphragm running gap being formed between the second over-roller (120) and the first over-roller (110), so that the diaphragm (170) to be processed is in contact and cooperation with the second over-roller (120) within the diaphragm running gap; A separator (130), part of the separator (130) being arranged within the diaphragm running gap, and the separator (130) within the diaphragm running gap being adhesively arranged on the surface of the second over-roller (120), so that a blank area (171) corresponding to the position of the separator (130) is formed during the running of the diaphragm (170) to be processed.

2. The diaphragm processing equipment according to claim 1, characterized in that The separator (130) is arranged in a strip shape along the advancing direction, tensioning mechanisms (140) being respectively arranged at both ends of the separator (130), the tensioning mechanisms (140) being respectively arranged on both sides of the second over-roller (120), and the tensioning mechanisms (140) being used for stretching and fixing the separator (130).

3. The diaphragm processing equipment according to claim 2, characterized in that, The tensioning mechanism (140) includes a support frame (141), a support shaft (142) and a roller (143), the support frame (141) being rotatably arranged with the support shaft (142), the roller (143) being fixedly arranged on the support shaft (142), and the separator (130) being fixed on the surface of the roller (143) to drive the separator (130) to take in and pay out on the surface of the roller (143) under the rotation of the support shaft (142).

4. The diaphragm processing equipment according to claim 3, characterized in that The tensioning mechanism (140) further includes a driving member, the driving member being connected to the support shaft (142) to drive the support shaft (142) to rotate circumferentially.

5. The diaphragm processing equipment according to claim 3, characterized in that, The device further includes a separator position adjusting mechanism (150), the separator position adjusting mechanism (150) including a slider (151) and a slide rail (152) in sliding fit, the slider (151) being fixedly connected to the support frame (141), the extending direction of the slide rail (152) being perpendicular to the plane where the rotation direction of the second over-roller (120) is located, and the slider (151) moving on the slide rail (152) to adjust the position of the separator (130).

6. The diaphragm processing equipment according to any one of claims 2-5, characterized in that, The stretching angle of the separator (130) is greater than the departure angle of the coating within the net-like texture; wherein, The stretching angle of the separator (130) is the included angle between the stretching direction of the tensioning mechanism (140) on the separator (130) and the running track of the diaphragm (170). The departure angle of the coating in the mesh pattern is the angle between a line from the center point of the contact position between the second roller (120) and the diaphragm (170) to the edge of the coating position between the second roller (120) and the diaphragm (170) and the running track of the diaphragm (170).

7. The diaphragm processing equipment according to any one of claims 1-5, characterized in that, The device further comprises a deviation correction detection mechanism (160), wherein the deviation correction detection mechanism (160) is used to detect the position of a blank area (171) formed by the membrane (170), so as to determine the position of the diaphragm (130) corresponding to the blank area (171).

8. The diaphragm processing equipment according to claim 7, characterized in that, The deviation correction detection mechanism (160) comprises a laser signal transmitter and a laser signal receiver, wherein the laser signal transmitter is used to transmit a surface laser to the diaphragm (170) forming the blank area (171), wherein the surface laser covers the edge position of the diaphragm (170) forming the blank area (171) and the blank area (171), and the laser signal receiver is used to receive the surface laser to determine the edge position of the blank area (171) of the diaphragm (170).

9. The diaphragm processing equipment according to any one of claims 1-5, characterized in that, The second passing roller (120) is arranged opposite to the first passing roller (110); or the second passing roller (120) is arranged staggered with the first passing roller (110).

10. The diaphragm processing equipment according to claim 9, characterized in that, The diameter of the first roller (110) is greater than the diameter of the second roller (120).

11. The diaphragm processing equipment according to claim 1, characterized in that, The second roller (120) comprises a gravure roller (122) or a micro gravure roller (121); the diameter of the micro gravure roller (121) is 20 mm to 50 mm, and the diameter of the gravure roller (122) is 125 mm to 250 mm.

12. A solid electrolyte coating device, characterized in that, The coating equipment comprises the film processing equipment according to any one of claims 1-11.

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