A lithium battery electrode zebra coating device and coating method

Abstract

The present invention discloses a zebra coating device and a coating method for lithium battery electrodes. The zebra coating device for lithium battery electrodes of the present invention includes a separator unwinding mechanism, a substrate unwinding mechanism, a laminating mechanism, a coating mechanism, a drying mechanism, an electrode winding mechanism, and a separator winding mechanism; the laminating mechanism is used to laminate a plurality of separators unwound by the separator unwinding mechanism on the substrate unwound by the substrate unwinding mechanism; the laminating mechanism, the coating mechanism, and the drying mechanism are arranged in sequence along the coating feeding direction; the separator winding mechanism is used to wind up a plurality of separators torn off from the substrate, and the electrode winding mechanism is used to wind up the electrodes. The zebra coating device for lithium battery electrodes of the present invention can achieve the efficient production of lithium battery electrodes with zebra coatings, and the size and positioning accuracy adjustment of the zebra coatings are highly controllable. The lithium battery electrode zebra coating method of the present invention can efficiently produce high-quality lithium battery electrodes with zebra coatings having high precision.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery pole piece production, and in particular to a zebra coating device and a coating method for lithium battery pole pieces. Background Art

[0002] Positive and negative electrodes are important core components of lithium batteries. Depending on the battery product and its application scenario, the coating methods are divided into continuous coating, intermittent coating, zebra coating, mixed coating, etc. Different coating methods have different advantages and disadvantages. For example, the 4680 large-scale power cylindrical battery led by Tesla requires a zebra coating method to perform production operations, and at the same time places extremely high demands on the size and positioning consistency of the zebra coating as well as production efficiency.

[0003] The zebra coating method in the prior art mainly adjusts the positioning and size of each coating line during zebra coating by adding gaskets to the coating die head. The advantage of this method is that it only needs to adjust one component of the coating die head, and the scope of involvement is small. However, its disadvantages are also particularly obvious. For example, only the overall positioning of the coating can be controlled and adjusted online in a closed loop through methods such as CCD detection. However, it is impossible to control and adjust the several zebra coating lines within the coating range, and the die head can only be manually adjusted by stopping the machine. In addition, because the coating slurry is a non-Newtonian fluid, it fluctuates when the coating die head applies it to the surface of the substrate, making the size and positioning of the zebra coatings unstable. This is especially obvious when the production speed is increased. It is difficult to meet the requirements of high-precision size and positioning consistency, and it is also impossible to improve production efficiency. Summary of the Invention

[0004] The present invention aims to address the problem of low controllable coating precision and adjustability in existing zebra coating equipment, making it difficult to meet the production requirements for high-precision zebra-coated lithium battery pole pieces. The present invention provides a zebra coating equipment for lithium battery pole pieces. This equipment can achieve efficient production of zebra-coated lithium battery pole pieces, and the zebra coating precision and controllability are high.

[0005] The present invention also aims to provide a zebra coating method for lithium battery pole pieces, which can efficiently produce zebra-coated lithium battery pole pieces, and the zebra-coated lithium battery pole pieces produced are of high quality.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A zebra coating device for lithium battery pole pieces, comprising a diaphragm unwinding mechanism, a substrate unwinding mechanism, a laminating mechanism, a coating mechanism, a drying mechanism, a pole piece winding mechanism, and a diaphragm winding mechanism;

[0008] The laminating mechanism is used to laminate a plurality of diaphragms unwound by the diaphragm unwinding mechanism onto the substrate unwound by the substrate unwinding mechanism during operation; the laminating mechanism, the coating mechanism, and the drying mechanism are arranged in sequence along the coating feeding direction. During operation, the coating mechanism is used to coat slurry on the substrate with the diaphragm laminated thereon, and the drying mechanism is used to dry the coated slurry; the diaphragm winding mechanism is used to wind a plurality of diaphragms torn from the substrate after the coated slurry is dried during operation, and the electrode winding mechanism is used to wind the electrode after the coated slurry is dried and the diaphragm is removed during operation.

[0009] In a preferred embodiment, the diaphragm unwinding mechanism includes a diaphragm unwinding shaft capable of unwinding multiple diaphragm coils synchronously; and / or, the diaphragm winding mechanism includes a diaphragm winding shaft capable of winding multiple diaphragms synchronously.

[0010] In a preferred embodiment, a diaphragm deviation rectifying mechanism is arranged between the diaphragm unwinding mechanism and the laminating mechanism, and the diaphragm deviation rectifying mechanism includes a diaphragm deviation rectifying roller.

[0011] And / or, a substrate deviation rectifying mechanism is arranged between the laminating mechanism and the coating mechanism, and the substrate deviation rectifying mechanism includes a substrate deviation rectifying roller.

[0012] In a preferred embodiment, an electrode deviation rectifying mechanism is arranged on the feeding side of the electrode winding mechanism, and the electrode deviation rectifying mechanism includes an electrode deviation rectifying roller.

[0013] In a preferred embodiment, a lamination detection mechanism is arranged on the discharging side of the laminating mechanism, and the lamination detection mechanism includes a vision detection camera.

[0014] In a preferred embodiment, a plurality of guide rollers for guiding the feeding or discharging of the corresponding tape are respectively arranged on the feeding side of the laminating mechanism, between the laminating mechanism and the coating mechanism, between the coating mechanism and the drying mechanism, and on the discharging side of the drying mechanism.

[0015] In a preferred embodiment, for the lithium battery electrode zebra coating equipment described in any one of the above, the diaphragm unwinding mechanism includes a first diaphragm unwinding group and a second diaphragm unwinding group. During operation, a plurality of diaphragms unwound by the first diaphragm unwinding group and a plurality of diaphragms unwound by the second diaphragm unwinding group are respectively laminated by the laminating mechanism on both sides of the substrate unwound by the substrate unwinding mechanism;

[0016] The coating mechanism includes a first coating group and a second coating group, and is used to coat slurry on both sides of the substrate with the diaphragm laminated thereon during operation; the diaphragm winding mechanism includes a first diaphragm winding group and a second diaphragm winding group, and is used to wind the diaphragms torn from both sides of the substrate after the coated slurry is dried during operation.

[0017] In a further preferred embodiment, at least a turning roller group is provided between the first coating group and the second coating group, which is used to turn over and guide the substrate that enters the second coating group after being coated with slurry by the first coating group during operation.

[0018] A method for zebra coating of lithium battery electrode sheets includes the following steps:

[0019] S1. Bond several diaphragm zebras on a substrate to form a diaphragm substrate with zebra bonding.

[0020] S2. Overall coat slurry on the surface of the diaphragm substrate where the diaphragm is bonded, and dry it.

[0021] S3. Tear off the diaphragm on the diaphragm substrate after drying the coated slurry to obtain a lithium battery electrode sheet.

[0022] In a preferred embodiment, in S1, diaphragms are bonded on both sides of the substrate, and in S2, slurry is overall coated on both sides of the diaphragm substrate.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] The zebra coating equipment for lithium battery electrode sheets of the present invention is provided with a diaphragm unwinding mechanism, a substrate unwinding mechanism, a bonding mechanism, a coating mechanism, a drying mechanism, an electrode sheet winding mechanism and a diaphragm winding mechanism. The diaphragm unwinding mechanism can unwind multiple diaphragms synchronously and bond them in a zebra pattern on the substrate unwound by the substrate unwinding mechanism by the bonding mechanism. The coating mechanism can overall coat slurry on the substrate with zebra-bonded diaphragms. The drying mechanism can dry the diaphragm substrate coated with slurry, and the diaphragm winding mechanism can wind and tear off multiple diaphragms on the diaphragm substrate after drying the coated slurry. The electrode sheet winding mechanism can wind the zebra-coated electrode sheet after tearing off the diaphragm, so as to realize the production of zebra-coated lithium battery electrode sheets.

[0025] Among them, a diaphragm deviation rectifying mechanism, a substrate deviation rectifying mechanism and an electrode sheet deviation rectifying mechanism are provided, which can perform online deviation rectification on the unwound diaphragm, diaphragm substrate and electrode sheet during the production process to ensure production stability and accuracy. Moreover, a bonding detection mechanism is provided, which can detect the bonding situation of the diaphragm on the surface of the substrate and then feedback to the deviation rectifying mechanism for adjustment to meet the high controllability of the accuracy of the diaphragm size and positioning, so as to improve the size and positioning accuracy of the zebra coating during the production process.

[0026] In addition, the diaphragm unwinding mechanism is set as two unwinding groups, and the corresponding coating mechanism is set as two coating groups for coating slurry on both sides of the diaphragm substrate, which can overall coat slurry on both sides of the diaphragm substrate respectively during the production process, greatly improving the production efficiency.

[0027] The zebra coating method for lithium battery electrodes of the present invention first laminates a separator on a substrate in a zebra lamination manner to form a separator substrate, then coats a slurry on the surface of the separator substrate and dries it, and tears off the separator to obtain a zebra-coated electrode, realizing the rapid production of zebra-coated lithium battery electrodes. Among them, the separator is a definite solid substance, which can be more reliably controlled compared with the slurry fluid, making the controllability of the size and positioning accuracy of the zebra coating higher, and avoiding the influence on the size and positioning between zebra coatings when directly performing zebra coating through a coating die head, greatly improving the production efficiency and the quality of the produced zebra-coated lithium battery electrodes. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the zebra coating equipment for lithium battery electrodes of the present invention in a specific embodiment;

[0029] Figure 2 It is a schematic flow diagram of the zebra coating method for lithium battery electrodes of the present invention in a specific embodiment;

[0030] Figure 3 It is a schematic structural diagram of the separator substrate after laminating the separator;

[0031] Figure 4 It is a schematic structural diagram of the separator substrate after coating the slurry;

[0032] Figure 5 It is a schematic structural diagram of the lithium battery electrode with a zebra coating.

[0033] Reference Signs in the Drawings:

[0034] 1 - First diaphragm unwinding group, 101 - First diaphragm unwinding shaft, 2 - Second diaphragm unwinding group, 201 - Second diaphragm unwinding shaft, 3 - Diaphragm deviation rectifying mechanism, 301 - Diaphragm deviation rectifying roller, 4 - Substrate unwinding mechanism, 401 - Substrate unwinding shaft, 5 - Laminating mechanism, 501 - First laminating roller, 502 - Second laminating roller, 6 - Laminating detection mechanism, 7 - Substrate deviation rectifying mechanism, 701 - Substrate deviation rectifying roller, 8 - First turning roller group, 801 - First turning roller, 9 - First coating group, 91 - First coating die head, 92 - First coating roller, 10 - Second turning roller group, 1001 - Second turning roller, 11 - Second coating group, 111 - Second coating die head, 112 - Second coating roller, 12 - Drying mechanism, 13 - First diaphragm winding group, 131 - First diaphragm winding shaft, 14 - Second diaphragm winding group, 141 - Second diaphragm winding shaft, 15 - Electrode sheet deviation rectifying mechanism, 151 - Electrode sheet deviation rectifying roller, 16 - Electrode sheet winding mechanism, 161 - Electrode sheet winding shaft, 17 - Guide roller, 18 - Diaphragm, 19 - Substrate, 20 - Diaphragm substrate, 2001 - Diaphragm laminating area, 2002 - Coating blank area, 21 - Integral coating electrode sheet, 211 - Substrate blank area, 212 - Integral slurry coating area, 22 - Zebra coating electrode sheet, 221 - Electrode sheet blank area, 222 - Zebra slurry coating area. Detailed implementation manners

[0035] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings. However, the protection scope and implementation manners of the present invention are not limited thereto.

[0036] In the description of specific embodiments, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. In addition, terms such as "first" and "second" are only for the convenience of distinction, and for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structures or elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention, let alone indicating or implying relative importance.

[0037] Unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] Example 1

[0039] For the zebra coating equipment of the lithium battery electrode sheet of the present invention, please refer to Figure 1 as shown, it includes a diaphragm unwinding mechanism, a substrate unwinding mechanism 4, a laminating mechanism 5, a coating mechanism, a drying mechanism 12, an electrode sheet winding mechanism 16 and a diaphragm winding mechanism.

[0040] The diaphragm unwinding mechanism is used to unwind a diaphragm 18 with a width corresponding to the zebra coating on the zebra coating lithium battery electrode sheet, that is, a narrow-width diaphragm, which can specifically be a tape, etc. Among them, the diaphragm unwinding mechanism includes a diaphragm unwinding shaft that can freely rotate for unwinding. The diaphragm unwinding shaft can be installed on a frame or a fixed surface and can synchronously unwind multiple diaphragm coils. Specifically, in some specific embodiments, multiple narrow-width slip shafts, such as narrow-width air-expansion slip shafts, can be axially arranged and installed on the roller shaft of the diaphragm unwinding shaft. Multiple diaphragm coils can be independently clamped on the roller shaft by multiple narrow-width slip shafts respectively and unwind synchronously with the rotation of the roller shaft, and the multiple unwound diaphragm 18 tapes are kept parallel.

[0041] The substrate unwinding mechanism 4 is used to unwind the substrate 19, specifically the wide-width foil on the zebra coating lithium battery electrode sheet. Among them, the substrate unwinding mechanism 4 includes a substrate unwinding shaft 401 that can freely rotate for unwinding. The substrate unwinding shaft 401 can be installed on a frame or a fixed surface and can rotate to unwind the wide-width substrate coil.

[0042] When performing the zebra coating work on the lithium battery electrode sheet, the diaphragm unwinding mechanism synchronously unwinds multiple diaphragms 18, and the substrate unwinding mechanism 4 unwinds the substrate 19. The unwound substrate 19 and diaphragm 18 converge at the laminating mechanism 5, and the laminating mechanism 5 laminates multiple diaphragms 18 in parallel on the surface of the substrate 19, so that there are multiple zebralaminated diaphragms 18 on the surface of the substrate 19 to form a diaphragm substrate 20. Then, the diaphragm substrate 20 is pulled by the winding and unwinding to the coating mechanism, and the electrode paste is integrally coated on the surface of the diaphragm substrate 20 where the diaphragm 18 is zebralaminated to form an integral coating electrode sheet 21; the integral coating electrode sheet 21 continues to be fed by the winding and unwinding to the drying mechanism 12 to dry the coated electrode paste; after drying and discharging, the multiple diaphragms among them are torn off and wound by the diaphragm winding mechanism, and after removing the diaphragm 18, a zebra coating electrode sheet 22 is formed and wound by the electrode sheet winding mechanism 16.

[0043] Among them, the laminating mechanism 5 is a pressing laminating mechanism. Specifically, the laminating mechanism 5 includes a first laminating roller 501 and a second laminating roller 502 which are oppositely arranged, such as being arranged vertically opposite to each other, and both the first laminating roller 501 and the second laminating roller 502 can rotate freely; there is an unwinding and pressing gap between the first laminating roller 501 and the second laminating roller 502, and the base material 19 and multiple diaphragms 18 pass through the unwinding and pressing gap during unwinding. Moreover, an external power mechanism that can drive the first laminating roller 501 and the second laminating roller 502 to move closer to each other is provided, such as a motor, a cylinder, etc., or it is designed such that the unwinding and pressing gap between the first laminating roller 501 and the second laminating roller 502 is smaller than the total thickness of the base material 19 and the diaphragm 18, so that the base material 19 and the diaphragm 18 are pressed against each other by the first laminating roller 501 and the second laminating roller 502 when passing through the unwinding and pressing gap during unwinding and are tightly attached.

[0044] The coating mechanism specifically includes a coating die head and a configured coating roller. The coating die head can be selected as a slit extrusion coating die head, and there is a gap between the coating nozzle of the coating die head and the roller surface of the coating roller. During operation, the diaphragm base material 20 passes over the coating roller and the surface with the zebra-bonded diaphragm 18 faces the coating die head, and the electrode paste extruded from the coating nozzle of the coating die head is coated on the surface of the diaphragm base material 20 with the bonded diaphragm 18, and is continuously coated along the length direction of the diaphragm base material 20 as the diaphragm base material 20 unwinds and moves.

[0045] The drying mechanism 12 specifically includes an oven, specifically it can be a long oven, such as an air-floating oven can be selected. There is a drying and heating zone inside the oven. The diaphragm base material 20 after the electrode paste is coated is drawn through the oven by winding and unwinding, and is dried at high temperature during the process of passing through the drying and heating zone. Moreover, multiple temperature zones can be set in the drying and heating zone as needed, and the drying temperatures between the temperature zones can be different.

[0046] The diaphragm winding mechanism includes a diaphragm winding shaft that can rotate freely for winding. The diaphragm winding shaft can be installed on a frame or a fixed surface, and can synchronously wind multiple diaphragms 18 on the integral coated electrode sheet 21 after the paste is dried and torn off. Specifically, in some specific embodiments, a plurality of narrow slip shafts can be axially arranged and installed on the roller shaft of the diaphragm winding shaft, such as narrow air-expansion slip shafts. Multiple diaphragm 18 tapes can be respectively and independently connected to the plurality of narrow slip shafts, and are synchronously wound with the rotation of the roller shaft, and the wound multiple diaphragm 18 tapes are kept parallel.

[0047] The pole piece winding mechanism 16 includes a pole piece winding shaft 161 that can rotate freely for winding. The pole piece winding shaft 161 can be installed on a frame or a fixed surface and can rotate to wind the zebra-coated pole piece 22 after removing the separator 18. In some embodiments, based on the similar size structure of the zebra-coated pole piece 22 and the substrate 19 unwound by the substrate unwinding mechanism 4, the pole piece winding shaft 161 is similar to the substrate unwinding shaft 401.

[0048] In a preferred embodiment, the laminating mechanism 5, the coating mechanism, and the drying mechanism 12 are arranged in sequence along the coating feeding direction. The separator substrate 20 formed by laminating the separator 18 on the substrate 19 by the laminating mechanism 5 can sequentially pass through the coating mechanism and the drying mechanism 12 under the traction of winding and unwinding. The positions of the separator unwinding mechanism, the substrate unwinding mechanism 4, the pole piece winding mechanism 16, and the separator winding mechanism can be set according to actual needs. For example, the separator unwinding mechanism and the substrate unwinding mechanism 4 can be arranged on the feeding side of the laminating mechanism 5, and the pole piece winding mechanism 16 and the separator winding mechanism can be arranged on the discharging side of the drying mechanism 12.

[0049] Further preferably, guide rollers 17 can be arranged on the feeding and discharging sides of the laminating mechanism 5, the coating mechanism, and the drying mechanism 12 to guide the corresponding tape for feeding or discharging, making the position arrangement of each mechanism in the overall equipment more flexible.

[0050] In the specific embodiment shown, a number of guide rollers 17 are respectively arranged on the feeding side of the laminating mechanism 5, between the laminating mechanism 5 and the coating mechanism, between the coating mechanism and the drying mechanism 12, and on the discharging side of the drying mechanism 12. Among them, the guide roller 17 arranged between the separator unwinding mechanism and the feeding side of the laminating mechanism 5 can make the unwound separator 18 enter the laminating mechanism 5 flat after being guided; the guide roller 17 arranged between the substrate unwinding mechanism 4 and the feeding side of the laminating mechanism 5 can make the unwound substrate 19 enter the laminating mechanism 5 flat after being guided; the guide roller 17 arranged between the laminating mechanism 5 and the coating mechanism can make the laminated separator substrate 20 enter the coating mechanism flat; the guide roller 17 arranged between the coating mechanism and the drying mechanism 12 makes the overall coated pole piece 21 after coating the electrode paste enter the drying mechanism 12 flat to ensure uniform drying; the guide roller 17 arranged between the drying mechanism 12 and the separator winding mechanism can separate the separator 18 from the substrate 19 on the dried overall coated pole piece 21, so that the separator 18 can be torn off and enter the separator winding mechanism for winding flat; the guide roller 17 arranged between the drying mechanism 12 and the pole piece winding mechanism 16 can make the zebra-coated pole piece 22 after removing the separator 18 enter the pole piece winding mechanism 16 flat for wrinkle-free winding.

[0051] In another preferred embodiment, please refer to again Figure 1As shown in the figure, a diaphragm deviation rectifying mechanism 3 is arranged between the diaphragm unwinding mechanism and the laminating mechanism 5, which can rectify the unwound diaphragm 18 entering the laminating mechanism 5 to ensure the laminating accuracy of the diaphragm 18 on the substrate 19. Specifically, the diaphragm deviation rectifying mechanism 3 includes a diaphragm deviation rectifying roller 301, which can axially move under the drive of an external power source such as a motor or a cylinder to adjust the position of the unwound diaphragm 18 passing through the diaphragm deviation rectifying roller 301 in the width direction, so that the diaphragm 18 accurately corresponds to the diaphragm laminating area on the substrate 19 at the laminating mechanism 5.

[0052] Further, please refer to Figure 1 As shown in the figure, a substrate deviation rectifying mechanism 7 is arranged between the laminating mechanism 5 and the coating mechanism, which can rectify the diaphragm substrate 20 entering the coating mechanism to ensure the coating accuracy of the slurry coating area on the diaphragm substrate 20. Specifically, the substrate deviation rectifying mechanism 7 includes a substrate deviation rectifying roller 701, which can axially move under the drive of an external power source such as a motor or a cylinder to adjust the position of the diaphragm substrate 20 passing through the substrate deviation rectifying roller 701 in the width direction, so that the slurry coating area of the diaphragm substrate 20 accurately corresponds to the coating nozzle of the coating die at the coating mechanism.

[0053] Further, please refer to Figure 1 As shown in the figure, a pole piece deviation rectifying mechanism 15 is arranged on the feeding side of the pole piece winding mechanism 16. In the specifically shown embodiment, the pole piece deviation rectifying mechanism 15 includes a pole piece deviation rectifying roller 151, which can axially move under the drive of an external power source such as a motor or a cylinder to adjust the position of the zebra-coated pole piece 22 passing through the pole piece deviation rectifying roller 151 in the width direction, so that the width ends of the zebra-coated pole piece 22 accurately align with the width ends of the pole piece winding shaft 161 at the pole piece winding mechanism 16.

[0054] In another preferred embodiment, please refer to Figure 1 As shown in the figure, a laminating detection mechanism 6 is arranged on the discharging side of the laminating mechanism 5, which can detect the laminating positioning accuracy of the completed laminated diaphragm substrate 20. Among them, the laminating detection mechanism 6 includes a vision detection camera, such as a CCD camera. Further optionally, the laminating detection mechanism 6 is arranged to be controlled and connected to the diaphragm deviation rectifying mechanism 3 through a controller. The laminating positioning accuracy information detected by the laminating detection mechanism 6 can be fed back to the controller, and the controller controls the diaphragm deviation rectifying mechanism 3 to perform deviation rectifying adjustment to ensure the laminating accuracy of the diaphragm 18 on the diaphragm substrate 20 and meet the accuracy requirements of the size and positioning of the diaphragm 18.

[0055] Embodiment 2

[0056] The lithium battery pole piece zebra coating equipment in this embodiment is similar to that in Embodiment 1. Further, please refer to Figure 1As shown, in the zebra coating device for lithium battery electrode sheets of this embodiment, the separator unwinding mechanism includes a first separator unwinding group 1 and a second separator unwinding group 2.

[0057] Among them, the first separator unwinding group 1 is provided with a first separator unwinding shaft 101, and the second separator unwinding group 2 is provided with a second separator unwinding shaft 201. The first separator unwinding shaft 101 and the second separator unwinding shaft 201 can be shafts on which multiple narrow slip shafts are arranged axially along the roller shaft. During operation, the first separator unwinding shaft 101 and the second separator unwinding shaft 201 can respectively unwind multiple separators 18 synchronously.

[0058] And corresponding guide rollers 17 are provided between the first separator unwinding group 1 and the laminating mechanism 5, and between the second separator unwinding group 2 and the laminating mechanism 5. During lamination, the multiple separators 18 unwound by the first separator unwinding group 1 and the multiple separators 18 unwound by the second separator unwinding group 2 can respectively enter the laminating mechanism 5 from the upper and lower sides of the base material 19 entering the laminating mechanism 5 under the guiding action of the corresponding guide rollers 17, and are respectively laminated on the upper and lower surfaces of the base material 19 by the laminating mechanism 5, so that the upper and lower surfaces of the formed separator base material 20 are both laminated with separators 18.

[0059] Furthermore, please refer to Figure 1 As shown, the coating mechanism includes a first coating group 9 and a second coating group 11, which can respectively perform overall coating of slurry on both sides of the separator base material 20 that are both laminated with separators 18 during operation. Among them, the first coating group 9 includes a first coating die head 91 and a corresponding first coating roller 92, and the second coating group 11 includes a second coating die head 111 and a corresponding second coating roller 112. During specific coating operations, the first coating group 9 and the second coating group 11 respectively coat both sides of the separator base material 20, and the operation sequence is sequential coating.

[0060] Moreover, the coating direction in the first coating group 9 and the coating direction of the second coating group 11 can be the same or different. For example, the first coating group 9 and the second coating group 11 can be arranged in sequence along the feeding direction, the first coating die head 91 and the second coating die head 11 are arranged oppositely and respectively correspond to both sides of the separator base material 20, and the separator base material 20 does not need to be turned over during travel, and both sides of the separator base material 20 can be coated by the first coating group 9 and the second coating group 11; or, the first coating group 9 and the second coating group 11 can be arranged in sequence along the feeding direction, the first coating die head 91 and the second coating die head 11 face the same direction, and the separator base material 20 needs to be turned over at least once after the first side is coated at the first coating group 9 and then enters the second coating group 11, so that the second coating die head 11 corresponds to the second side of the separator base material 20 and coats the second side of the separator base material 20.

[0061] In addition, the diaphragm winding mechanism includes a first diaphragm winding group 13 and a second diaphragm winding group 14, which can respectively wind the diaphragms 18 torn from the two surfaces of the dried integral coated electrode sheet 21 during operation.

[0062] Among them, the first diaphragm winding group 13 is provided with a first diaphragm winding shaft 131, and the second diaphragm winding group 14 is provided with a second diaphragm winding shaft 141. The first diaphragm winding shaft 131 and the second diaphragm winding shaft 141 can be shafts with multiple narrow-width slip shafts axially arranged on the roller shaft. And corresponding guide rollers 17 are arranged between the first diaphragm winding shaft 131 and the drying mechanism 12, and between the second diaphragm winding shaft 141 and the drying mechanism 12. During the specific winding operation, the first diaphragm winding shaft 131 and the second diaphragm winding shaft 141 respectively, under the action of the corresponding guide rollers 17, synchronously tear off and wind multiple diaphragms 18 on the upper surface of the integral coated electrode sheet 21 from above, and multiple diaphragms 18 on the lower surface of the integral coated electrode sheet 21 from below.

[0063] Embodiment III

[0064] The lithium battery electrode sheet zebra coating equipment of this embodiment is similar to that of Embodiment II. Further, please refer to Figure 1 As shown, in the lithium battery electrode sheet zebra coating equipment of this embodiment, the coating directions of the first coating group 9 and the second coating group 11 are the same. Specifically, the orientations of the first coating die head 91 and the second coating die head 11 are the same. The diaphragm substrate 20 needs to be turned over at least once after the first surface is coated at the first coating group 9 and then enters the second coating group 11 for the second surface coating.

[0065] In a preferred embodiment, a first turning roller group 8 is arranged on the feeding side of the first coating group 9. The first turning roller group 8 includes a number of first turning rollers 801. The diaphragm substrate 20 can enter the first coating group 9 after being turned and guided by the number of first turning rollers 801, and the first surface of the diaphragm substrate 20 is opposite to the first coating die head 91 of the first coating group 9, so that the first coating group 9 can accurately perform the overall slurry coating on the first surface of the diaphragm substrate 20.

[0066] Further, a second turning roller group 10 is arranged between the first coating group 9 and the second coating group 11. The second turning roller group 10 includes a number of second turning rollers 1001. After the first surface of the diaphragm substrate 20 is coated at the first coating group 9, it can enter the second coating group 11 after being turned over and guided by the number of second turning rollers 1001, and the second surface of the diaphragm substrate 20 is opposite to the second coating die head 111 of the second coating group 11, so that the second coating group 11 can accurately perform the overall slurry coating on the second surface of the diaphragm substrate 20.

[0067] Embodiment IV

[0068] The zebra coating method for the lithium battery electrode sheet of the present invention can specifically be coated by using the lithium battery electrode sheet zebra coating equipment according to any one of Embodiments 1 to 3. For the specific process, please refer to Figure 2 as shown, which includes the following steps:

[0069] S1. The diaphragm unwinding mechanism unwinds multiple diaphragms 18 synchronously, and the substrate unwinding mechanism 4 unwinds the substrate 19.

[0070] S2. The diaphragm 18 and the substrate 19 are unwound and enter the laminating mechanism 5, and the laminating mechanism 5 laminates multiple diaphragms 18 on the surface of the substrate 19 in a zebra pattern; as Figure 3 shown, the diaphragm 18 is laminated on the diaphragm laminating area 2001 of the substrate 19, the diaphragms 18 are distributed in a striped pattern, and the coating blank areas 2002 for electrode paste coating are arranged between adjacent diaphragms 18. The diaphragm laminating area 2001 and the coating blank areas are alternately distributed to form the diaphragm substrate 20 with zebra lamination.

[0071] S3. The diaphragm substrate 20 continues to be unwound and enters the coating mechanism, and the coating mechanism coats the paste integrally on the surface of the diaphragm substrate 20 where the diaphragm 18 is laminated; it continues to be unwound and enters the drying mechanism 12, and the drying mechanism 12 dries the electrode paste coated on the integral coating electrode sheet 21 to form the integral coating electrode sheet 21;

[0072] as Figure 4 shown, in the integral coating electrode sheet 21, the electrode paste integrally coats the areas including the diaphragm laminating area 2001 and the coating blank areas 2002 to form the integral paste coating area 212, and substrate blank areas 211 are reserved at both ends of the width of the electrode sheet.

[0073] S4. The integral coating electrode sheet 21 continues to be unwound, and during the unwinding process, the diaphragm winding mechanism winds the multiple diaphragms 18 on the integral coating electrode sheet 21 and tears off the diaphragms 18 from the integral coating electrode sheet 21 to obtain the zebra coating electrode sheet 22;

[0074] as Figure 5 shown, the electrode sheet blank areas 221 and the zebra paste coating areas 222 on the zebra coating electrode sheet 22 are alternately distributed; the zebra coating electrode sheet 22 after the diaphragms 18 are torn off is wound by the electrode sheet winding mechanism 16.

[0075] In a preferred embodiment, in S1, at least two diaphragm unwinding mechanisms are provided to unwind at least two groups of multiple diaphragms 18 synchronously, and the two groups of multiple diaphragms 18 are fed into the laminating mechanism 5 from the upper and lower sides of the substrate 19, and are pressed by the laminating mechanism 5 on the upper and lower surfaces of the substrate 19, so that the upper and lower surfaces of the diaphragm substrate 20 are both laminated with diaphragms 18. Among them, the multiple diaphragms 18 on the upper and lower surfaces of the diaphragm substrate 20 correspond to each other one by one.

[0076] Further, in S3, two coating mechanisms are provided to integrally coat the slurry on the upper and lower surfaces of the separator substrate 20 with the separator 18 attached thereto. In addition, two separator winding mechanisms are provided to wind the separators 18 on the upper and lower surfaces of the corresponding integrally coated electrode sheets 21.

[0077] Among them, during the production process, the separator substrate 20 is subjected to overall deviation correction control when entering the coating mechanism, and the precision control of the zebra slurry coating area 222 in the zebra-coated electrode sheet 22 is achieved by relying on the positioning regulation of the overall coating.

[0078] This coating method can obtain the effect of the zebra coating by relying on the form of the overall coating, with high production efficiency, and will not affect the coating quality due to increasing the production speed, having extremely high reliability and high quality of the produced zebra-coated electrode sheet 22.

[0079] The above embodiments are only the preferred embodiments of the present invention, and are only used to describe the technical solutions of the present invention in more detail. However, the above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. The protection scope and implementation manner of the present invention are not limited thereto. Any changes, combinations, deletions, substitutions or modifications made without departing from the spirit and principle of the present invention will be included in the protection scope of the present invention.

Claims

1. A lithium battery electrode sheet zebra coating device, characterized in that, It includes a diaphragm unwinding mechanism, a substrate unwinding mechanism, a laminating mechanism, a coating mechanism, a drying mechanism, a pole piece winding mechanism, and a diaphragm winding mechanism; The laminating mechanism is used to laminate a plurality of diaphragms unwound by the diaphragm unwinding mechanism onto the substrate unwound by the substrate unwinding mechanism during operation; the laminating mechanism, the coating mechanism, and the drying mechanism are arranged in sequence along the coating feeding direction. During operation, the coating mechanism is used to coat slurry on the substrate with the laminated diaphragm, and the drying mechanism is used to dry the coated slurry; the diaphragm winding mechanism is used to wind a plurality of diaphragms torn from the substrate after the coated slurry is dried during operation, and the pole piece winding mechanism is used to wind the pole piece after the coated slurry is dried and the diaphragm is removed during operation; A diaphragm deviation rectifying mechanism is arranged between the diaphragm unwinding mechanism and the laminating mechanism, and the diaphragm deviation rectifying mechanism includes a diaphragm deviation rectifying roller; And / or, a substrate deviation rectifying mechanism is arranged between the laminating mechanism and the coating mechanism, and the substrate deviation rectifying mechanism includes a substrate deviation rectifying roller; A laminating detection mechanism is arranged on the discharge side of the laminating mechanism, which can detect the laminating positioning accuracy of the completed laminated diaphragm substrate, and the laminating detection mechanism includes a vision detection camera; The laminating detection mechanism is arranged to be controlledly connected to the diaphragm deviation rectifying mechanism through a controller. The laminating positioning accuracy information detected by the laminating detection mechanism can be fed back to the controller, and the controller controls the diaphragm deviation rectifying mechanism to perform deviation rectifying adjustment.

2. The lithium battery electrode sheet zebra coating equipment according to claim 1, characterized in that, The diaphragm unwinding mechanism includes a diaphragm unwinding shaft, which can unwind multiple diaphragm coils synchronously; and / or, the diaphragm winding mechanism includes a diaphragm winding shaft, which can wind multiple diaphragms synchronously.

3. The lithium battery electrode sheet zebra coating equipment according to claim 1, characterized in that, A pole piece deviation rectifying mechanism is arranged on the feeding side of the pole piece winding mechanism, and the pole piece deviation rectifying mechanism includes a pole piece deviation rectifying roller.

4. The lithium battery electrode sheet zebra coating equipment according to claim 1, characterized in that, A plurality of guide rollers for guiding the feeding or discharging of the corresponding tape are respectively arranged on the feeding side of the laminating mechanism, between the laminating mechanism and the coating mechanism, between the coating mechanism and the drying mechanism, and on the discharge side of the drying mechanism.

5. The lithium battery electrode sheet zebra coating equipment according to any one of claims 1-4, characterized in that, The diaphragm unwinding mechanism includes a first diaphragm unwinding group and a second diaphragm unwinding group. During operation, a plurality of diaphragms unwound by the first diaphragm unwinding group and a plurality of diaphragms unwound by the second diaphragm unwinding group are respectively laminated on both sides of the substrate unwound by the substrate unwinding mechanism by the laminating mechanism; The coating mechanism includes a first coating group and a second coating group, which are used to coat slurry on both sides of the substrate with the laminated diaphragm respectively during operation; the diaphragm winding mechanism includes a first diaphragm winding group and a second diaphragm winding group, which are used to wind the diaphragms torn from both sides of the substrate after the coated slurry is dried respectively during operation.

6. The lithium battery electrode sheet zebra coating equipment according to claim 5, characterized in that, At least a turning roller group is arranged between the first coating group and the second coating group, which is used to turn over and guide the substrate that enters the second coating group after being coated with slurry by the first coating group during operation.

7. A method for zebra coating of lithium battery electrode sheets, characterized in that, Coating is carried out by using the lithium battery pole piece zebra coating equipment according to any one of claims 1 to 6, including the following steps: S1. Laminating a plurality of diaphragms in a zebra pattern on the substrate to form a diaphragm substrate with zebra lamination; S2. Overall coating slurry on the surface of the diaphragm substrate with the laminated diaphragm, and drying; S3. Tear off the separator on the separator substrate after drying the coated slurry to obtain a lithium battery electrode sheet.

8. The method for zebra coating of lithium battery electrode sheets according to claim 7, characterized in that, In step S1, separators are respectively attached to both sides of the substrate, and in step S2, the slurry is integrally coated on both sides of the separator substrate.

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