Coating equipment and battery production line

Abstract

The invention discloses coating equipment and a battery production line, and relates to the technical field of battery production. A first coating mechanism of the coating equipment comprises at least one first die head; the second coating mechanism comprises at least two moving devices and at least two second die heads, and the at least two second die heads are used for forming at least two second film areas on the second surface; in the thickness direction of the base material, the first film area and the second film area with overlapped projections form a film area group; the moving devices and the second die heads are connected in a one-to-one correspondence manner in number, and the moving devices are used for enabling the corresponding second die heads to move in the axial direction of the back roller; the detection mechanism is used for detecting the dislocation amount between the first film area and the second film area, and the moving device is used for enabling the second die head to move in the axial direction of the back roller according to the dislocation amount, so that the position of the second die head can be adjusted according to the detected dislocation amount. Therefore, the dislocation amount between the second film area and the first film area can be reduced through the movement of the second die head.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and in particular to a coating device and a battery production line. BACKGROUND

[0002] With the application and popularization of power lithium batteries, energy storage batteries and other batteries in electric vehicles, communication equipment, portable electronic products, aircraft, ships and other equipment and facilities, the requirements for the endurance mileage and safety performance of the batteries are increasingly high, and the coating process of the battery pole piece also faces higher requirements.

[0003] In the related art, the manufacturing process of the battery includes coating the battery slurry on the current collector substrate, and then forming a large roll of pole piece through a rolling process; the large roll of pole piece is formed into a single section pole piece through pre-cutting, die cutting and striping processes; and the single section pole piece is formed into a bare battery cell through a lamination and winding process.

[0004] The two large surfaces of the pole piece are usually coated with positive and negative electrode materials to form film regions, respectively, and the film regions of the two large surfaces of the pole piece may be misaligned due to alignment problems, which may affect the performance and safety of the battery. SUMMARY

[0005] The main purpose of the present application is to provide a coating device and a battery production line to reduce the amount of misalignment.

[0006] To achieve the above-mentioned purpose, the coating device is used to coat the substrate to form a pole piece, the substrate includes a first surface and a second surface oppositely arranged in the thickness direction of the substrate, the coating device includes a back roller, a first coating mechanism, a second coating mechanism and a detection mechanism, the substrate is used to run along the circumferential direction of the back roller, and the width direction of the substrate is parallel to the axial direction of the back roller; the first coating mechanism includes at least one first die, the at least one first die is used to coat the first surface to form at least two first film regions on the first surface, and the at least two first film regions are arranged at intervals along the width direction of the substrate; the second coating mechanism includes at least two moving devices and at least two second dies; the at least two second dies are respectively used to coat the second surface to form at least two second film regions on the second surface, and the at least two second film regions are arranged at intervals along the width direction of the substrate; along the thickness direction of the substrate, the first film regions and the second film regions with projection overlap form a film region group; the at least two moving devices are one-to-one connected with the at least two second dies in number, and the moving device is used to move the corresponding second die along the axial direction of the back roller; the detection mechanism is used to detect the misalignment amount between the at least one first film region and the second film region belonging to the same film region group, the detection mechanism is electrically connected with the at least two moving devices, and the at least two moving devices are used to move the corresponding second die along the axial direction of the back roller according to the misalignment amount.

[0007] The coating device provided by the application can provide stable support for the coating of the substrate when in use; at least one first die head respectively coats the first surface of the substrate to form at least two first film regions, and at least two second die heads respectively coat the second surface of the substrate to form at least two second film regions, which respectively helps to improve the overall manufacturing efficiency of the pole piece; and at least two moving devices are used to move the corresponding second die head according to the displacement amount detected by the detection mechanism, so that the position of the second die head can be adjusted along the axial direction of the backing roll according to the detected displacement amount, thereby helping to reduce the displacement amount between the second film region and the first film region coated subsequently through the movement of the second die head.

[0008] In some implementations, the detection mechanism includes at least two first detection units and at least two second detection units, the at least two first detection units are used to detect the first position information of the at least two first film regions in a one-to-one correspondence in number, and the at least two second detection units are used to detect the second position information of the respective second film regions in a one-to-one correspondence in number; the at least two first detection units and the at least two second detection units are respectively electrically connected to the moving devices in a one-to-one correspondence in number, and the displacement amount is formed by the first position information and the corresponding second position information.

[0009] At this time, the at least two first detection units and the at least two second detection units are respectively electrically connected to the moving devices in a one-to-one correspondence in number, so that the displacement amount between each group of first film regions and second film regions can be detected separately by each group of first detection units and second detection units, and the corresponding second die head can be moved separately by the moving device, thereby reducing the information interference of the displacement amount between the film regions, and helping to quickly and accurately reduce the displacement amount between the film regions.

[0010] In some implementations, the moving device includes a driving member and a mounting seat, the second die head is mounted to the mounting seat, and the driving member is used to drive the mounting seat to move the second die head along the axial direction of the backing roll.

[0011] At this time, the driving member can move the mounting seat and the second die head along the axial direction of the backing roll, and the mounting seat provided helps to improve the mounting and dismounting efficiency of the second die head.

[0012] In some implementations, the moving device further includes a fixed seat; the moving device further includes a transmission rod, the transmission rod is rotatably arranged on the fixed seat, and the transmission rod is provided with a first transmission screw structure; the fixed seat is provided with a guide rail, the guide rail is arranged to extend along the axial direction of the backing roll, and the mounting seat is movably connected to the guide rail to move along the extension direction of the guide rail; the side of the mounting seat facing the fixed seat is provided with a connecting block, the connecting block is provided with a connecting hole, the hole wall of the connecting hole is provided with a second transmission screw structure, and the first transmission screw structure and the second transmission screw structure are screw-engaged.

[0013] At this time, the first transmission screw structure is screwed with the second transmission screw structure, so as to improve the displacement precision between the transmission rod and the connecting block and the mounting seat; the mounting seat is movably connected with the guide rail, so as to improve the movement stability of the mounting seat, thereby facilitating the smooth and accurate position adjustment of the second die head on the mounting seat.

[0014] In some implementations, the fixing seat is provided with two guide rails, which are arranged at intervals in a direction perpendicular to the axial direction of the back roller; the mounting seat is provided with two groups of sliding structures on a side thereof facing the fixing seat, the two groups of sliding structures are arranged at intervals in a direction perpendicular to the axial direction of the back roller, and the two groups of sliding structures are in one-to-one correspondence with the two guide rails in number.

[0015] At this time, the two guide rails are arranged at intervals in a direction perpendicular to the axial direction of the back roller, and the two groups of sliding structures are in one-to-one correspondence with the two guide rails in number, so as to further improve the movement stability of the mounting seat and the second die head by increasing the span of the two guide rails.

[0016] In some implementations, each group of sliding structures includes at least two sliding blocks, the at least two sliding blocks in the same group are arranged at intervals in the axial direction of the back roller, and the at least two sliding blocks in the same group are in sliding connection with the same guide rail in position.

[0017] At this time, the at least two sliding blocks in the same group are in sliding connection with the same guide rail in position, so as to further improve the movement stability of the mounting seat and the second die head by the sliding surface of the sliding block.

[0018] In some implementations, the fixing seat is provided with a first fixing block and a second fixing block, the first fixing block, the connecting block and the second fixing block are arranged in the axial direction of the back roller, one end of the transmission rod is rotatably connected with the first fixing block, and the other end of the transmission rod is rotatably connected with the second fixing block.

[0019] At this time, one end of the transmission rod is rotatably connected with the first fixing block, and the other end of the transmission rod is rotatably connected with the second fixing block, so as to improve the transmission stability of the transmission rod, thereby further improving the movement stability of the mounting seat and the second die head.

[0020] In some implementations, the mounting seat is provided with a positioning vertical plate on a side thereof facing the back roller in a direction perpendicular to the axial direction of the back roller, the positioning vertical plate extends in the axial direction of the back roller, and a side of the second die head facing the back roller abuts against the positioning vertical plate.

[0021] At this time, the positioning vertical plate can abut against the second die head, so as to facilitate the quick installation of the second die head.

[0022] In some implementations, the coating device further includes a drying device for drying the second film area; the second die head, the second detection unit and the drying device are sequentially arranged in the conveying direction of the substrate.

[0023] At this time, the second die, the second detection unit and the drying device are sequentially arranged, so that the second detection unit can detect before the second film area is dried, thereby facilitating obtaining the misregistration amount earlier, thereby facilitating adjusting the position of the second die earlier, thereby facilitating reducing the misregistration amount between the subsequently coated film areas earlier.

[0024] In some implementations, the first die, the first detection unit and the second die are sequentially arranged along the conveying direction of the substrate, and the first coating mechanism and the first detection unit are arranged upstream of the second die respectively.

[0025] At this time, the first die, the first detection unit and the second die are sequentially arranged, facilitating orderly coating of the first film area, detecting the first position information of the first film area, coating the second film area, and detecting the second position information of the second film area, thereby facilitating improving the overall efficiency of obtaining the misregistration amount and the overall efficiency of adjusting the position of the second die.

[0026] In some implementations, the coating device further comprises a drying device for drying the second film area; and the second die, the drying device and the second detection unit are sequentially arranged along the conveying direction of the substrate.

[0027] At this time, the second die, the drying device and the second detection unit are sequentially arranged, so that the second detection unit can detect after the second film area is dried, and the form of the dried second film area is more stable, thereby facilitating more accurately obtaining the misregistration amount, thereby facilitating more accurately adjusting the position of the second die, thereby facilitating more accurately reducing the misregistration amount between the subsequently coated film areas.

[0028] The application also provides a battery production line, which comprises the coating device.

[0029] The battery production line provided by the application is used in use, and the moving device is used to move the corresponding second die according to the misregistration amount detected by the detection mechanism, so that the position of the second die can be adjusted along the axial direction of the backing roll according to the detected misregistration amount, thereby facilitating reducing the misregistration amount between the subsequently coated second film area and the first film area through the movement of the second die. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0031] Figure 1 A schematic view of a power utilization device corresponding to an embodiment of the present application; Figure 2 A schematic view of a battery device corresponding to an embodiment of the present application; Figure 3 A schematic view of a battery cell corresponding to an embodiment of the present application; Figure 4 A schematic view of a use of an embodiment of the coating equipment provided by the present application; Figure 5 A perspective view of a partial structure of an embodiment of the coating equipment provided by the present application; Figure 6 A top view of a partial structure of an embodiment of the coating equipment provided by the present application; Figure 7 Another schematic view of a use of an embodiment of the coating equipment provided by the present application; Figure 8 A schematic view of a moving device in an embodiment of the coating equipment provided by the present application; Figure 9 A schematic view of a use of another embodiment of the coating equipment provided by the present application.

[0032] Explanation of reference numerals: 10, power utilization device; 11, power utilization controller; 12, motor; 20, battery device; 21, battery box; 22, battery cell assembly; 221, battery cell; 222, housing; 223, top cover; 224, adapter piece; 225, bare cell; 226, tab; 227, electrode terminal; 30, tab; 310, base material; 311, first surface; 312, second surface; 313, first section; 314, second section; 315, enclosed space; 321, first film region; 322, second film region; 400, coating equipment; 410, rack; 411, support plate; 4121, first support horizontal rod; 4131, first support vertical rod; 4122, second support horizontal rod; 4132, second support vertical rod; 420, back roller; 431, first die; 441, moving device; 4411, driving member; 4412, mounting seat; 4413, fixing seat; 4414, transmission rod; 4415, guide rail; 4416, connecting block; 4417, sliding block; 4418a, first fixing block; 4418b, second fixing block; 4419, positioning vertical plate; 442, second die; 450, detection mechanism; 451, first detection unit; 452, second detection unit; 460, drying device; 461, first drying part; 462, second drying part; 470, equipment controller.

[0033] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] It should be noted that if the present application has a directional indication (such as up, down, left, right, front, back, etc.) in the embodiments, the directional indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indication also changes accordingly.

[0036] In addition, if the present application has a description of "first", "second" and the like in the embodiments, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appears throughout the text, which means that the three parallel schemes include "A and / or B", which includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0037] With the application and popularization of power lithium batteries, energy storage batteries and other batteries in electric vehicles, communication equipment, portable electronic products, aircraft, ships and other equipment and facilities, the requirements for the endurance mileage and safety performance of the batteries are becoming higher and higher, and the coating process of the battery pole piece also faces higher requirements.

[0038] In the related art, the manufacturing process of a battery includes coating a battery slurry on a current collector substrate, and then forming a large roll of electrode sheet through a rolling process; the large roll of electrode sheet is subjected to a pre-cutting process, a die-cutting process, and a slitting process to form a single-section electrode sheet, and the single-section electrode sheet is subjected to a stacking process and a winding process to form a bare battery cell.

[0039] The two large surfaces of the electrode sheet are usually coated with positive and negative electrode materials to form film regions, respectively. The film regions of the two large surfaces of the electrode sheet may be misaligned due to alignment problems, and the misalignment of the film regions may affect the performance and safety of the battery.

[0040] Among them, for the misalignment between the film regions, the precision of the coating equipment may be a factor, such as the misalignment of the coating equipment and the coating die head system, or the deviation of the transmission system; possible factors also include process parameters, such as poor tension control of the substrate running, which causes the material to shift during the coating process. In addition, the quality of the raw material of the substrate cannot be ignored; for example, if the substrate in the form of a foil has a wave shape or uneven thickness, it may cause misalignment during coating. On the other hand, environmental factors such as temperature and humidity changes may also affect the stability of the substrate running, thereby causing misalignment; in addition, operation problems in the production process, such as improper tension adjustment or insufficient equipment calibration, may also cause misalignment. Possible factors also include equipment maintenance, if the alignment sensor or transmission components are not checked regularly, it may also cause misalignment.

[0041] Based on the above considerations, in order to facilitate reducing the misalignment amount, the present application proposes a coating equipment and a battery production line. Among them, the coating equipment and the battery production line can adjust the position of the corresponding die head according to the misalignment amount of the film region during use, thereby reducing the misalignment amount between the film regions in subsequent coating.

[0042] Next, the coating equipment and the battery production line proposed by the present application will be explained and described in detail with specific embodiments.

[0043] Among them, the coating equipment and the battery production line can be used in battery devices and corresponding electrical equipment. It can be understood that the electrical equipment can include but is not limited to mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, etc., and the spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.

[0044] The following embodiments are described by taking the electrical equipment as a vehicle for example. In the absence of obvious contradictions, the following embodiments can also be applicable to electrical equipment other than vehicles.

[0045] Reference Figure 1The electric device 10 includes a battery apparatus 20. The battery apparatus 20 of the vehicle can be arranged at a bottom, a head, a tail or the like of the vehicle. The battery apparatus 20 can be used for power supply of the vehicle, for example, the battery apparatus 20 can be used as an operating power source of the vehicle. The electric device 10, i.e., the vehicle, can further include an electric controller 11 and a motor 12. The electric controller 11 is used to control the battery apparatus 20 to supply power to the motor 12, for example, to supply power for starting, navigation and driving of the vehicle.

[0046] It can be understood that the battery apparatus 20 can not only be used as an operating power source of the electric device 10, i.e., the vehicle, but also be used as a driving power source of the vehicle, thereby completely or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0047] With reference to Figure 2 The battery apparatus 20 includes a battery box 21 and a battery cell assembly 22, and the battery cell assembly 22 is accommodated in the battery box 21. The battery apparatus 20 according to the embodiments of the present application can include at least one battery cell assembly 22 for providing voltage and capacity. The battery cell assembly 22 can include at least one battery cell 221, and the plurality of battery cells 221 are connected in series, in parallel or in a mixed manner by busbars. The mixed connection can be understood as including series connection and parallel connection.

[0048] The battery cell assembly 22 can be a battery module formed by arranging and fixing a plurality of battery cells 221. For example, the battery module can be formed by binding a plurality of battery cells 221 by a cable tie. In some embodiments, the battery cell assembly 22 can be accommodated in the battery box 21 by being fixed in the battery box 21. Of course, the battery cell assembly 22 can only include one battery cell 221, and the embodiments are not limited in this regard.

[0049] In some embodiments, the battery housing 21 can include a first housing and a second housing. The first housing and the second housing are coupled to form a closed space inside the battery housing 21 to accommodate the battery cell 221 or the battery cell assembly 22. Here, the closed refers to covered or closed, and the closed position can be sealed or not. It can be understood that the first housing and the second housing can each have an opening, and the closed space is formed by coupling the openings. Of course, one of the first housing and the second housing can have an opening, for example, the first housing has no opening and the second housing has an opening, and the present embodiment does not limit this. The battery housing 21 can include a top cover, a frame and a bottom plate, and the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the battery housing 21 to accommodate the battery cell 221 or the battery cell assembly 22. The first housing can be the top cover (or the bottom plate), and the second housing can be the combination of the frame and the bottom plate (or the combination of the frame and the top cover) with an opening.

[0050] In some embodiments, the battery device can be a battery pack, which can include the battery housing 21 and one or more battery cell assemblies 22 accommodated in the battery housing 21. In some embodiments, the battery housing 21 can be part of the chassis structure of the vehicle as the power equipment 10. For example, the top cover of the battery housing 21 can be at least part of the bottom plate of the vehicle, or the frame of the battery housing 21 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0051] In some embodiments, the battery device 20 can also refer to an energy storage device, which can include one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery cells 221 connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device. The energy storage device can include a battery housing 21, at least one side of which is provided with a door. The energy storage device can include an energy storage container, an energy storage cabinet, etc.

[0052] Reference Figure 3The battery cell 221 is composed of an electrode terminal 227 (also referred to as a pole) of the positive electrode, an electrode terminal 227 of the negative electrode, a separator, an electrolyte, and the like, and can be charged and discharged by electrochemical reaction. The battery cell 221 can be configured as a prismatic battery, a cylindrical battery, a pouch battery, or a strip-shaped battery, and the like. In addition, the battery cell 221 can include a shell 222, a top cover 223, a jumper 224, and a bare cell 225. The bare cell 225 has two tabs 226 corresponding to the positive and negative electrodes, respectively. The top cover 223 is provided with the electrode terminal 227. The jumper 224 connects different bare cells 225 through the tabs 226. The bare cell 225 is accommodated in the shell 222. The bare cell 225 can be formed by a subsequent winding, laminating, or the like of a pole piece. In the battery cell assembly 22, the electrode terminal 227 can be connected in series, parallel, or mixed connection between the battery cells 221 by connecting with the busbars.

[0053] Referring to Figure 4 , Figure 5 and Figure 6 wherein Figure 4 Fig. 1 shows a schematic diagram of the use of the coating apparatus 400 in an embodiment, Figure 5 Fig. 2 shows a perspective view of the partial structure of the coating apparatus 400 in the embodiment, Figure 6 Fig. 3 shows a top view of the partial structure of the coating apparatus 400 in the embodiment. In addition, the X-axis direction in the figure can be understood as the left-right direction, the Y-axis direction in the figure can be understood as the front-back direction, and the Z-axis direction in the figure can be understood as the up-down direction. In the embodiment, the coating apparatus 400 is used to coat a substrate 310 to form a pole piece 30. The substrate 310 includes a first surface 311 and a second surface 312 arranged opposite in the thickness direction of the substrate 310.

[0054] The coating device 400 comprises a back roller 420, a first coating mechanism, a second coating mechanism and a detection mechanism 450, the substrate 310 is used to run along the circumferential direction of the back roller 420, and the width direction of the substrate 310 is parallel to the axial direction of the back roller 420; the first coating mechanism comprises at least one first die head 431; the at least one first die head 431 is respectively used for coating the first surface 311 to form at least two first film areas 321 on the first surface 311, and the at least two first film areas 321 are arranged at intervals along the width direction of the substrate 310; the second coating mechanism comprises at least two moving devices 441 and at least two second die heads 442; the at least two second die heads 442 are respectively used for coating the second surface 312 to form at least two second film areas 322 on the second surface 312, and the at least two second film areas 322 are arranged at intervals along the width direction of the substrate 310; along the thickness direction of the substrate 310, the first film areas 321 and the second film areas 322 with projection overlap form a film area group, and it can be understood that the second film areas 322 are arranged in one-to-one correspondence with the first film areas 321 in position; the at least two moving devices 441 are connected in one-to-one correspondence with the at least two second die heads 442 in number, and the moving device 441 is used to move the corresponding second die head 442 along the axial direction of the back roller 420; the detection mechanism 450 is used to detect the dislocation amount between the at least one first film area 321 and the second film area 322 belonging to the same film area group, the detection mechanism 450 is electrically connected with the at least two moving devices 441, and the at least two moving devices 441 are used to move the corresponding second die head 442 along the axial direction of the back roller 420 according to the dislocation amount.

[0055] The substrate 310 can be understood as a current collector substrate, and the substrate 310 can be an aluminum foil or a composite foil containing an aluminum layer, a copper foil or a composite foil containing a copper layer, etc.; in addition, the substrate 310 is in the form of a strip as a whole. It can be understood that coating is to form a coating thin layer on the substrate 310 in the form of a liquid or a powder, for example, uniformly, continuously or discontinuously coating the prepared paste-like thick paste (positive active material or negative active material) on the substrate 310 (including the positive current collector or the negative current collector), for example, coating lithium iron phosphate, lithium nickel cobalt manganese acid, lithium nickel cobalt aluminum acid and graphite on the substrate 310.

[0056] In addition, the pole piece 30 formed in the figure can be formed into a large roll through a rolling process. For the pole piece 30 in the form of a roll, the first film area 321 and the second film area 322 can be understood as a first film area group and a second film area group, respectively. Figure 4The substrate 310 on the upper left side, the thickness direction of which is arranged along the Z-axis direction in the figure, the first surface 311 and the second surface 312 of the substrate 310 at this part are oppositely arranged in the Z-axis direction in the figure. For example, the first surface 311 in the figure can be understood as the back surface of the substrate 310, and the second surface 312 can be understood as the front surface of the substrate 310; it can be understood that the back surface and the front surface are relative concepts, that is, the first surface 311 can also be defined as the front surface, and the second surface 312 can also be defined as the back surface.

[0057] In addition, the coating device 400 can further include a rack 410, the back roller 420 can be rotatably arranged on the rack 410, and the first coating mechanism is connected with the rack 410. It can be understood that the rack 410 can include an integrated sub-rack body, or the rack 410 can include a split sub-rack body, and the present embodiment does not limit this. The rack 410 can be understood as a mounting base for mounting components such as the back roller 420, the first coating mechanism, the second coating mechanism, and the detection mechanism 450, and the rack 410 can be assembled from components such as pipes and plates. The back roller 420 can be understood as a component that is cylindrical as a whole and can rotate around its own axis, and the back roller 420 is usually mounted on the side of the substrate 310 away from the coating mechanism, thereby providing stable support for the coating of the substrate 310. Among them, the surface of the substrate 310 can abut on the outer circumferential surface of the back roller 420, so as to realize the running of the substrate 310 with the rotation of the back roller 420, thereby realizing the forward transportation of the substrate 310; at this time, the width direction of the substrate 310 is parallel to the axial direction of the back roller 420, which can be understood as the width direction of the substrate 310 being perpendicular to the running direction of the substrate 310. In addition, the back roller 420 can be rotatable relative to the rack 410 through shaft hole matching structure, bearing and other structures.

[0058] The first die 431 and the second die 442 can be understood as slurry output components of the coating mechanism, and the first die 431 and the second die 442 can be connected with the storage tank and the pump body, so that the pump body can deliver the slurry in the storage tank to the first die 431 and the second die 442 through the pipeline, and then the first die 431 and the second die 442 are respectively coated on the first surface 311 and the second surface 312 of the substrate 310, thereby forming the first film area 321 and the second film area 322, respectively. Among them, the first film area 321 and the second film area 322 can be understood as the areas where the substrate 310 is coated with battery slurry, respectively.

[0059] It can be understood that one first die 431 can be used to form one first film area 321, so that at least two first film areas 321 can be formed by at least two first dies 431; of course, at least two first film areas 321 can also be formed by one first die 431 having at least two spaced discharge ports. In addition, the first die 431 can be arranged on the rack 410 by fixed connection, movable connection and the like, for example, by clamping, clamping and the like, and the present embodiment does not limit this.

[0060] The moving device 441 can be understood as a device capable of moving the second die 442, specifically moving the second die 442 along the axial direction of the back roller 420, for example, moving along the Y-axis direction in Figure 6 The moving device 441 can include a mechanical arm, an electric push rod, a guide rail sliding block mechanism, a connecting rod mechanism, a crank sliding block mechanism, and a corresponding driving motor or driving cylinder.

[0061] The detection mechanism 450 can be understood as a mechanism capable of detecting the misalignment amount between each first film area 321 and the corresponding second film area 322; the detection mechanism 450 includes but is not limited to a visual detection module, a scale and the like. The visual detection module can be understood as a module for detecting the lug by machine vision; specifically, the visual detection module can first take a photo by a camera, and then use existing image recognition and the like to recognize and detect the photo obtained by photographing. The camera included in the visual detection module can be set as an area array camera, a line array camera and the like. The detection mechanism 450 is electrically connected with each moving device 441, and the misalignment amount detected by the detection mechanism 450 can be finally transmitted to the moving device 441 in a corresponding form, so that the misalignment amount information is used as the basis for calculating the displacement amount of the moving device 441. For example, each unit of misalignment amount can correspond to a predetermined amount of driving pulse, and then the moving device 441 determines the displacement amount according to the corresponding pulse signal.

[0062] Of course, in some embodiments, referring to Figure 4The coating apparatus 400 can further comprise an apparatus controller 470, a signal input end of the apparatus controller 470 being connected with the detection mechanism 450, and a signal output end of the apparatus controller 470 being connected with each of the moving devices 441; the apparatus controller 470 is configured to form a driving signal according to the misregistration amount, and the moving devices 441 are configured to receive the driving signal and move the corresponding second die 442 along the axial direction of the back roller 420. The apparatus controller 470 can comprise a host computer and a slave device, wherein the host computer can be understood as a computer system with strong computing and data processing capabilities, and the host computer can include but is not limited to a personal computer, an industrial computer or a server, etc. The slave device can be configured as a device or a controller directly connected with sensors, actuators and other hardware in a control system, and the hardware of the slave device can include a microcontroller, a PLC (Programmable Logic Controller), an embedded control board, etc. In addition, the apparatus controller 470 can use existing image recognition technology to recognize the size in the image and obtain the misregistration amount. The apparatus controller 470 can also form a misregistration amount recognition model by using a preset training model through model training.

[0063] According to the above analysis, in the use of the coating apparatus 400 in the above embodiments, the at least one first die 431 respectively coats the first surface 311 of the substrate 310 to form at least two first film regions 321, and the at least two second dies 442 respectively coat the second surface 312 of the substrate 310 to form at least two second film regions 322, which are respectively conducive to improving the overall manufacturing efficiency of the pole piece 30. In addition, referring to Figure 6 and Figure 7 wherein Figure 7 Another use schematic diagram of the coating apparatus 400 in the embodiment is shown; the at least two moving devices 441 are configured to move the corresponding second dies 442 according to the misregistration amount detected by the detection mechanism 450, for example, to move the second dies 442 along the Y direction in the figure, so as to adjust the position of the second dies 442 along the axial direction of the back roller 420 according to the detected misregistration amount, thereby facilitating reducing the misregistration amount between the subsequently coated second film regions 322 and the first film regions 321 by moving the second dies 442; for example, in Figure 7 , the position of the second dies 442 can be adjusted according to the misregistration amount L on the upper side in Figure 7 , so as to reduce the misregistration amount between the subsequently coated second film regions 322 and the first film regions 321 (as shown in Figure 7 ).

[0064] In some embodiments, referring to Figure 5 and Figure 6The detection mechanism 450 comprises at least two first detection units 451 and at least two second detection units 452. The at least two first detection units 451 are used to detect the first position information of the at least two first film areas 321 in one-to-one correspondence in number. The at least two second detection units 452 are used to detect the second position information of the respective second film area 322 in one-to-one correspondence in number. The first detection unit 451 and the second detection unit 452 can be respectively set as the above-mentioned visual detection module. The at least two first detection units 451 and the at least two second detection units 452 are respectively electrically connected to the moving device 441 in one-to-one correspondence in number. It can be understood that the respective first detection unit 451 and the respective second detection unit 452 form a relatively independent independent unit with the moving device 441. At this time, the corresponding independent unit can be selected according to the film coating specification of the pole piece 30.

[0065] In addition, the first position information can be the boundary position information of the first film area 321, and the second position information can be the boundary position information of the second film area 322. The misalignment amount is formed by the first position information and the corresponding second position information, for example, by the distance between the boundary position of the first film area 321 and the boundary position of the second film area 322. Taking the case that the first detection unit 451 and the second detection unit 452 are respectively set as a CCD camera (a digital camera with a charge-coupled device image sensor, where CCD is the abbreviation of Charge Coupled Device) as an example, the film area edge (the boundary of the first film area 321 and the boundary of the second film area 322) of the pole piece 30 can be detected online by the CCD camera to monitor the position of the film area on the first surface 311 and the second surface 312 in real time, and the detection data can be fed back to the program stored in advance in the above-mentioned device controller 470, so as to quantize the moving direction and position of the second die 442 through the data of the CCD camera.

[0066] In this embodiment, the at least two first detection units 451 and the at least two second detection units 452 are respectively electrically connected to the moving device 441 in one-to-one correspondence in number, so that the misalignment amount between each group of first film areas 321 and second film areas 322 can be detected separately by each group of first detection units 451 and second detection units 452, and the corresponding second die 442 can be moved separately by the moving device 441, so as to reduce the information interference of the misalignment amount between the film areas, thereby facilitating the rapid and accurate reduction of the misalignment amount between the film areas.

[0067] In some embodiments, with reference to Figure 6 and Figure 8The moving device 441 comprises a driving member 4411 and a mounting base 4412, and the second die head 442 is mounted on the mounting base 4412. The driving member 4411 is configured to drive the mounting base 4412 to move the second die head 442 along the axial direction of the back roller 420, for example, along the Y-axis direction in the figure. The housing part of the driving member 4411 can be fixed relative to the rack 410, and the power output end of the driving member 4411 can be drivingly connected to the mounting base 4412.

[0068] The driving member 4411 can be configured as a driving motor, a driving cylinder, etc. The housing part of the driving member 4411 can be configured as a motor housing, a cylinder housing, etc. The power output end of the driving member 4411 can be configured as a motor shaft, a cylinder rod, etc. The housing part of the driving member 4411 can be fixed relative to the rack 410 by means of fasteners such as bolts, clamping members, plug-in structures, etc. The relative fixation includes direct fixation and indirect fixation through other components. The second die head 442 can be mounted on the mounting base 4412 by means of fasteners such as bolts, clamping members, plug-in structures, etc. The mounting base 4412 can be in the form of a plate, a frame, etc.

[0069] In this embodiment, the driving member 4411 can drive the mounting base 4412 and the second die head 442 to move along the axial direction of the back roller 420. The mounting base 4412 is configured to improve the efficiency of mounting and dismounting the second die head.

[0070] In some embodiments, referring to Figure 8 The moving device 441 further comprises a fixing base 4413, which can be fixedly connected to the rack 410, for example, by means of welding, fasteners such as bolts, etc. The moving device 441 further comprises a transmission rod 4414, which is rotatably arranged on the fixing base 4413 and is provided with a first transmission screw structure. For example, the transmission rod 4414 can be configured as a lead screw, a threaded rod, etc.

[0071] The fixing base 4413 is provided with a guide rail 4415, which extends along the axial direction of the back roller 420, for example, along the Y-axis direction in the figure. Figure 8The guide rail 4415 is extended along the Y-axis. It can be fixed to the mounting base 4413 using fasteners such as bolts or welding. The mounting base 4412 is movably connected to the guide rail 4415 and moves along the extension direction of the guide rail 4415. For example, if the mounting base 4412 moves along the Y-axis, it can drive the second mold head 442 to move along the Y-axis. A connecting block 4416 is provided on the side of the mounting base 4412 facing the mounting base 4413, for example, on the lower side of the mounting base 4412. The connecting block 4416 has a connecting hole, and the hole wall has a second transmission helical structure. The first transmission helical structure engages with the second transmission helical structure; for example, the second transmission helical structure can be configured as a threaded rod, a threaded rod, or a helical groove. Furthermore, the connecting block 4416 can be fixed to the mounting base 4412 using fasteners such as bolts or welding.

[0072] In this embodiment, the first transmission helical structure and the second transmission helical structure are engaged, which helps to improve the displacement accuracy between the transmission rod 4414, the connecting block 4416, and the mounting base 4412; the mounting base 4412 is movably connected to the guide rail 4415, which helps to improve the movement stability of the mounting base 4412, which helps to smoothly and accurately adjust the position of the second mold head 442 on the mounting base 4412.

[0073] In some implementations, refer to Figure 8 The fixed base 4413 is provided with two guide rails 4415, which are spaced apart along the axial direction perpendicular to the back roller 420. This can be understood as being spaced apart along the belt-carrying direction of the substrate 310, for example, along... Figure 8 The mounting base 4412 is spaced apart along the X-axis direction; two sets of sliding structures are provided on the side of the mounting base 4413 facing the fixed base 4413 (e.g., the lower side in the figure), wherein each set of sliding structures may include at least one slider 4417; the two sets of sliding structures are spaced apart along a direction perpendicular to the axial direction of the back roller 420, for example... Figure 8 The sliders 4417 represented by solid lines form one group, and the sliders 4417 represented by dashed lines form another group. These two groups of sliding structures are spaced apart along the X-axis in the figure. Furthermore, the two groups of sliding structures are connected to the two guide rails 4415 in a one-to-one correspondence, meaning that one guide rail 4415 is connected to one group of sliding structures. Moreover, the above connections can be made using sliding connections to achieve the sliding function of the sliding structures and sliders 4417. The sliding structures (including sliders 4417) can be connected to the mounting base 4412 using fasteners such as welding or screws.

[0074] In the embodiment, the two guide rails 4415 are arranged in a direction perpendicular to the axial direction of the back roller 420, and the two groups of sliding structures are connected to the two guide rails 4415 in a one-to-one correspondence in number, so as to further improve the moving stability of the mounting seat 4412 and the second die head 442 by increasing the span of the two guide rails 4415.

[0075] In some embodiments, referring to Figure 8 , each group of sliding structures includes at least two sliding blocks 4417, and the at least two sliding blocks 4417 in the same group are arranged in the axial direction of the back roller 420, for example, arranged in the Y-axis direction in the figure, and the at least two sliding blocks 4417 in the same group are in sliding connection with the same guide rail 4415 in position.

[0076] In the embodiment, the at least two sliding blocks 4417 in the same group are in sliding connection with the same guide rail 4415 in position, so as to further improve the moving stability of the mounting seat 4412 and the second die head 442 by the sliding surface of the sliding block 4417.

[0077] In some embodiments, referring to Figure 8 , the fixed seat 4413 is provided with a first fixed block 4418a and a second fixed block 4418b, and the first fixed block 4418a, the connecting block 4416, and the second fixed block 4418b are arranged in the axial direction of the back roller 420, for example, arranged in the Y-axis direction in the figure. The first fixed block 4418a and the second fixed block 4418b can be connected to the fixed seat 4413 by welding, screws, fasteners, etc. In addition, one end (for example, the left end in the figure) of the transmission rod 4414 is in rotary connection with the first fixed block 4418a, and the other end (for example, the right end in the figure) of the transmission rod 4414 is in rotary connection with the second fixed block 4418b. It can be understood that the first fixed block 4418a and the second fixed block 4418b can be respectively provided with shaft shoulders, stop blocks, etc., to limit the axial movement of the transmission rod 4414, so that the axial position of the transmission rod 4414 is fixed when the transmission rod 4414 drives the connecting block 4416 to move axially through the screw transmission structure.

[0078] In the embodiment, one end of the transmission rod 4414 is in rotary connection with the first fixed block 4418a, and the other end of the transmission rod 4414 is in rotary connection with the second fixed block 4418b, so as to improve the transmission stability of the transmission rod 4414, thereby further improving the moving stability of the mounting seat 4412 and the second die head 442.

[0079] In some embodiments, referring to Figure 6 and Figure 8The mounting base 4412 is provided with a positioning vertical plate 4419 on the side of the mounting base 4412 facing the back roller 420 in a direction perpendicular to the axial direction of the back roller 420, for example, on the upper left side of the upper surface of the mounting base 4412 in the X-axis direction in the figure. The positioning vertical plate 4419 can be connected to the mounting base 4412 by welding, insertion or the like, or can be integrally formed with the mounting base 4412 by one-piece casting, one-piece injection molding, machining forming or the like, and the present embodiment is not limited in this regard. In addition, the positioning vertical plate 4419 extends in the axial direction of the back roller 420, for example, in the Y-axis direction in the figure, and the second die 442 abuts against the positioning vertical plate 4419 on the side of the second die 442 facing the back roller 420.

[0080] In this embodiment, the positioning vertical plate 4419 can abut against the second die 442, thereby facilitating quick installation of the second die 442 in place. It can be understood that the second die 442 can be positioned by the positioning vertical plate 4419 during installation.

[0081] In some embodiments, referring to Figure 4 The coating apparatus 400 further comprises a drying device 460 for drying the second film region 322; it can be understood that the drying device 460 is at least used for drying the second film region 322, for example, the drying device 460 can also be used for drying the first film region 321; in particular, the drying device 460 can comprise a first drying portion 461 and a second drying portion 462 connected in series, the first drying portion 461 is used for drying the first film region 321, and the second drying portion 462 is used for drying the second film region 322. The drying device 460 can be provided as an oven or the like. In addition, in the conveying direction of the substrate 310, the second die 442, the second detection unit 452 and the drying device 460 are arranged in sequence in the direction of the dashed arrow on the upper left side in Figure 4 It can be understood that after the second die 442 is used to coat the second film region 322, the second position information of the second film region 322 is detected by the second detection unit 452 first, and then the second film region 322 is dried by the drying device 460.

[0082] In this embodiment, the second die 442, the second detection unit 452 and the drying device 460 are arranged in sequence, so that the second detection unit 452 can detect before the second film region 322 is dried, thereby facilitating earlier acquisition of the misregistration amount, facilitating earlier adjustment of the position of the second die 442, and facilitating earlier reduction of the misregistration amount between the film regions coated subsequently.

[0083] In some embodiments, referring to Figure 4The first die 431, the first detection unit 451 and the second die 442 are arranged in sequence along the conveying direction of the substrate 310, for example, the first die 431, the first detection unit 451, the second die 442, the second detection unit 452 and the drying device 460 are arranged in sequence as a whole, and in addition, the first coating mechanism and the first detection unit 451 are arranged upstream of the second die 442 respectively.

[0084] In this embodiment, the first die 431, the first detection unit 451 and the second die 442 are arranged in sequence, which is conducive to orderly coating of the first film region 321, detection of the first position information of the first film region 321, coating of the second film region 322, and detection of the second position information of the second film region 322, thereby improving the overall efficiency of obtaining the misregistration amount and the overall efficiency of adjusting the position of the second die 442.

[0085] In some embodiments, referring to Figure 4 The back roller 420 is arranged opposite to the second die 442, and it can be understood that the coating device 400 comprises the back roller 420 arranged opposite to the second die 442; of course, the coating device 400 can also comprise a back roller 420 arranged opposite to the first die 431, which is not limited in this embodiment. In addition, the substrate 310 comprises a first section 313 and a second section 314; along the conveying direction of the substrate 310, the first section 313 is arranged upstream of the back roller 420 arranged opposite to the second die 442, and the second section 314 is arranged downstream of the back roller 420 arranged opposite to the second die 442; along the width direction of the substrate 310, for example, the projection results in Figure 4 The first section 313 and the second section 314 form an acute angle, for example, an angle of 30 degrees, 45 degrees, 60 degrees, etc.; the first detection unit 451 is arranged in the surrounding space 315 of the first section 313 and the second section 314, thereby shortening the overall length of the coating device 400.

[0086] Further, referring to Figure 4 The first detection unit 451 is arranged in the surrounding space 315 of the drying device 460, the first section 313 and the second section 314, thereby making the coating device 400 more compact.

[0087] In some embodiments, referring to Figure 5The rack 410 comprises a support plate 411, the back roller 420 opposite to the second die head 442 is rotationally connected with the support plate 411, for example, through shaft hole structure, bearing or the like. The rack 410 further comprises a first support horizontal rod 4121, wherein the cross section of the first support horizontal rod 4121 can be circular, oval, rectangular, rounded rectangular or the like; the two ends of the first support horizontal rod 4121 are respectively fixed to the support plate 411, including direct fixation and indirect fixation; in addition, the first detection unit 451 is installed on the first support horizontal rod 4121.

[0088] In this embodiment, the first detection unit 451 can be first installed on the first support horizontal rod 4121, and then fixed to the support plate 411 through the first support horizontal rod 4121, which is conducive to improving the overall installation efficiency.

[0089] In some embodiments, referring to Figure 4 and Figure 5 , the first support horizontal rod 4121 passes through the above-mentioned surrounding space 315, thereby facilitating the first detection unit 451 to be quickly installed in the above-mentioned surrounding space 315.

[0090] In some embodiments, the rack 410 further comprises a first support vertical rod 4131, wherein the cross section of the first support vertical rod 4131 can be circular, oval, rectangular, rounded rectangular or the like; the two ends of the first support horizontal rod 4121 are respectively connected with the first support vertical rod 4131, which can be connected by plug-in, welding, clamping or the like; the first support vertical rod 4131 is connected with the support plate 411, which can be connected by plug-in, welding, clamping or the like.

[0091] In this embodiment, the coating device 400 can first determine the position of the back roller 420 through the support plate 411, and then flexibly determine the position of the first detection unit 451 through the first support horizontal rod 4121 and the first support vertical rod 4131.

[0092] In some embodiments, referring to Figure 5 , the rack 410 further comprises a second support horizontal rod 4122 and a second support vertical rod 4132, wherein the cross section of the second support horizontal rod 4122 and the second support vertical rod 4132 can be circular, oval, rectangular, rounded rectangular or the like. The two ends of the second support horizontal rod 4122 are respectively connected with the second support vertical rod 4132, which can be connected by plug-in, welding, clamping or the like; the second support vertical rod 4132 is connected with the support plate 411, which can be connected by plug-in, welding, clamping or the like. The second detection unit 452 is installed on the second support horizontal rod 4122, which can be connected by plug-in, clamping or the like. In combination with Figure 4 and Figure 5The second support horizontal rod 4122 is located on the side of the substrate 310 away from the surrounding space 315, thereby facilitating reduction of the occupation of the surrounding space 315 by the second detection unit 452.

[0093] In this embodiment, the coating device 400 can first determine the position of the back roller 420 through the support plate 411, and then flexibly determine the position of the second detection unit 452 through the second support horizontal rod 4122 and the second support vertical rod 4132.

[0094] In some alternative embodiments, referring to Figure 9 The coating device 400 further comprises a drying device 460 for drying the second film region 322; it can be understood that the drying device 460 is at least used for drying the second film region 322, for example, the drying device 460 can also be used for drying the first film region 321; specifically, the drying device 460 can comprise a first drying part 461 and a second drying part 462 connected in series, the first drying part 461 is used for drying the first film region 321, and the second drying part 462 is used for drying the second film region 322. Wherein, the drying device 460 can be provided as an oven or the like. Along the conveying direction of the substrate 310, the conveying direction can refer to the direction of the dashed arrow on the top left side in Figure 9 , the second die 442, the drying device 460 and the second detection unit 452 are sequentially arranged; it can be understood that after the second die 442 is used to coat and form the second film region 322, the second film region 322 is first dried by the drying device 460, and then the second position information of the second film region 322 is detected by the second detection unit 452.

[0095] In this alternative embodiment, the second die 442, the drying device 460 and the second detection unit 452 are sequentially arranged, so that the second detection unit 452 can detect after the second film region 322 is dried, the form of the second film region 322 after drying is more stable, thereby facilitating more accurate acquisition of the misregistration amount, thereby facilitating more accurate adjustment of the position of the second die 442, thereby facilitating more accurate reduction of the misregistration amount between the film regions coated subsequently.

[0096] Continuing to refer to Figure 9 In some embodiments, along the conveying direction of the substrate 310, the first detection unit 451 is located downstream of the drying device 460, for example, on the left side in the figure; along the thickness direction of the substrate 310, for example, along the up-down direction in the figure, the first detection unit 451 is arranged opposite to the second detection unit 452, so that the first detection unit 451 and the second detection unit 452 can detect the film regions on the opposite sides of the same position of the pole piece 30 respectively, thereby facilitating reduction of the adverse effect of the position deviation of the pole piece 30 on the detection of the misregistration amount, thereby facilitating more accurate detection of the misregistration amount.

[0097] With continued reference to Figure 9 In some embodiments, the back roller 420 is disposed opposite the second die 442, the substrate 310 includes a first section 313 and a second section 314; the first section 313 is disposed upstream of the back roller 420 and the second section 314 is disposed downstream of the back roller 420 along a travel direction of the substrate 310; the first section 313 and the second section 314 are disposed in parallel along a width direction of the substrate 310, for example, the first section 313 and the second section 314 are projected to form a first projection 323 and a second projection 324, respectively, along the width direction of the substrate 310. Figure 9 In some embodiments, the first section 313 and the second section 314 are disposed in parallel, which is beneficial for reducing the height of the coating apparatus 400, and it can be understood that it is beneficial for making the coating apparatus 400 more flat.

[0098] With continued reference to Figure 9 In some embodiments, the drying device 460 includes a first drying portion 461 and a second drying portion 462 connected in series, the first drying portion 461 is used for drying the first film section 321, and the second drying portion 462 is used for drying the second film section 322; therefore, in the case that the first section 313 and the second section 314 are disposed in parallel, the drying device 460 can be made more flat, which is beneficial for reducing the volume of the drying device 460.

[0099] With reference to Figures 4 to 8In an embodiment, the coating apparatus 400 is used to coat the substrate 310 to form the pole piece 30, the substrate 310 includes a first surface 311 and a second surface 312 oppositely arranged in the thickness direction of the substrate 310, the coating apparatus 400 includes a rack 410, a back roller 420, a first coating mechanism, a second coating mechanism and a detection mechanism 450, the back roller 420 is rotatably arranged on the rack 410, the substrate 310 is used to run along the circumferential direction of the back roller 420, the width direction of the substrate 310 is parallel to the axial direction of the back roller 420; the first coating mechanism is connected with the rack 410, the first coating mechanism includes at least one first die head 431; each first die head 431 is used to coat the first surface 311 to form at least two first film regions 321 on the first surface 311, the first film regions 321 are arranged at intervals along the width direction of the substrate 310; the second coating mechanism includes at least two moving devices 441 and at least two second die heads 442; each second die head 442 is used to coat the second surface 312 to form at least two second film regions 322 on the second surface 312, the second film regions 322 are arranged at intervals along the width direction of the substrate 310, and the second film regions 322 are arranged one by one corresponding to the first film regions 321; the moving device 441 is connected with the second die head 442 one by one, and each moving device 441 is used to move the corresponding second die head 442 along the axial direction of the back roller 420; the detection mechanism 450 is used to detect the displacement amount between each first film region 321 and the corresponding second film region 322, the detection mechanism 450 is electrically connected with each moving device 441, and the moving device 441 is used to move the corresponding second die head 442 along the axial direction of the back roller 420 according to the displacement amount. The detection mechanism 450 includes at least two first detection units 451 and at least two second detection units 452, each first detection unit 451 is used to detect the first position information of each first film region 321 one by one, and each second detection unit 452 is used to detect the second position information of each second film region 322 one by one; each first detection unit 451 and each second detection unit 452 are electrically connected with the moving device 441 one by one, and the displacement amount is formed by the first position information and the corresponding second position information. The moving device 441 includes a driving member 4411 and a mounting seat 4412, the housing part of the driving member 4411 is fixed relative to the rack 410, the power output end of the driving member 4411 is drivingly connected with the mounting seat 4412, the driving member 4411 is used to move the mounting seat 4412 along the axial direction of the back roller 420, and the second die head 442 is mounted on the mounting seat 4412.The moving device 441 further comprises a fixed seat 4413 fixedly connected with the rack 410; the moving device 441 further comprises a transmission rod 4414 rotatably arranged on the fixed seat 4413, and the transmission rod 4414 is provided with a first transmission screw structure; the fixed seat 4413 is provided with a guide rail 4415 extending along the axial direction of the back roller 420, and the mounting seat 4412 is movably connected with the guide rail 4415 to move along the extension direction of the guide rail 4415; one side of the mounting seat 4412 facing the fixed seat 4413 is provided with a connecting block 4416, the connecting block 4416 is provided with a connecting hole, the hole wall of the connecting hole is provided with a second transmission screw structure, and the first transmission screw structure is screw-engaged with the second transmission screw structure. The fixed seat 4413 is provided with two guide rails 4415, and the guide rails 4415 are arranged in a spaced manner along a direction perpendicular to the axial direction of the back roller 420; one side of the mounting seat 4412 facing the fixed seat 4413 is provided with two groups of sliding structures, and each group of sliding structures is arranged in a spaced manner along a direction perpendicular to the axial direction of the back roller 420, and each group of sliding structures is connected with each guide rail 4415 in a one-to-one correspondence. Each group of sliding structures comprises at least two sliding blocks 4417, and the sliding blocks 4417 in the same group are arranged in a spaced manner along the axial direction of the back roller 420, and each sliding block 4417 in the same group is slidably connected with the corresponding guide rail 4415. The fixed seat 4413 is provided with a first fixed block 4418a and a second fixed block 4418b, the first fixed block 4418a, the connecting block 4416 and the second fixed block 4418b are arranged in a spaced manner along the axial direction of the back roller 420, one end of the transmission rod 4414 is rotatably connected with the first fixed block 4418a, and the other end of the transmission rod 4414 is rotatably connected with the second fixed block 4418b. Along a direction perpendicular to the axial direction of the back roller 420, one side of the mounting seat 4412 facing the back roller 420 is provided with a positioning vertical plate 4419 extending along the axial direction of the back roller 420, and one side of the second die head 442 facing the back roller 420 abuts against the positioning vertical plate 4419. The coating device 400 further comprises a drying device 460 for drying the second film area 322; along the conveying direction of the substrate 310, the second die head 442, the second detection unit 452 and the drying device 460 are arranged in sequence. Along the conveying direction of the substrate 310, the first die head 431, the first detection unit 451 and the second die head 442 are arranged in sequence, and the first coating mechanism and the first detection unit 451 are arranged upstream of the second die head 442 respectively.

[0100] The application also provides a battery production line comprising the above-mentioned coating device 400.

[0101] It can be understood that, since the above-mentioned battery production line adopts all the technical solutions of all the embodiments of the above-mentioned coating device 400, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0102] The above merely provides the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure variations made according to the technical concept of the present application, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A coating device, characterized in that, The coating equipment is used to coat a substrate to form an electrode sheet, the substrate including a first surface and a second surface disposed opposite to each other in the thickness direction of the substrate, the coating equipment comprising: A back roller, wherein the substrate is used to feed the tape along the circumferential direction of the back roller, and the width direction of the substrate is parallel to the axial direction of the back roller; A first coating mechanism includes at least one first die head; the at least one first die head is used to coat the first surface to form at least two first film areas on the first surface, the at least two first film areas being spaced apart along the width direction of the substrate. The second coating mechanism includes at least two moving devices and at least two second dies; the at least two second dies are respectively used to coat the second surface to form at least two second film areas on the second surface, the at least two second film areas being spaced apart along the width direction of the substrate; along the thickness direction of the substrate, the first film area and the second film area having overlapping projections form a film area group; the at least two moving devices are connected to the at least two second dies in a one-to-one correspondence, the moving devices being used to move the corresponding second die along the axial direction of the back roller; The detection mechanism is used to detect the misalignment between the at least one first membrane region and the second membrane region belonging to the same membrane region group. The detection mechanism is electrically connected to the at least two moving devices, which are used to move the corresponding second die head along the axial direction of the back roller according to the misalignment.

2. The coating equipment as described in claim 1, characterized in that, The detection mechanism includes at least two first detection units and at least two second detection units. The at least two first detection units are used to detect the first position information of at least two first membrane regions in a one-to-one correspondence in quantity. The at least two second detection units are used to detect the second position information of at least two second membrane regions in a one-to-one correspondence in quantity. The at least two first detection units and the at least two second detection units are electrically connected to the mobile device in a one-to-one correspondence in quantity, and the misalignment is formed by the first position information and the corresponding second position information.

3. The coating equipment as described in claim 1 or 2, characterized in that, The moving device includes a drive component and a mounting base. The second die head is mounted on the mounting base, and the drive component is used to cause the mounting base to move the second die head along the axial direction of the back roller.

4. The coating equipment as described in claim 3, characterized in that, The mobile device also includes a fixed base; The moving device further includes a transmission rod, which is rotatably mounted on the fixed base, and the transmission rod is provided with a first transmission screw structure; The fixed base is provided with a guide rail, which extends along the axial direction of the back roller. The mounting base is movably connected to the guide rail to move along the extension direction of the guide rail. The mounting base has a connecting block on the side facing the fixed base. The connecting block has a connecting hole. The hole wall of the connecting hole has a second transmission spiral structure. The first transmission spiral structure and the second transmission spiral structure are engaged.

5. The coating equipment as described in claim 4, characterized in that, The fixed base is provided with two guide rails, which are spaced apart in a direction perpendicular to the axial direction of the back roller. The mounting base has two sets of sliding structures on the side facing the fixed base. The two sets of sliding structures are spaced apart in a direction perpendicular to the axial direction of the back roller. The two sets of sliding structures are connected to the two guide rails in a one-to-one correspondence.

6. The coating equipment as described in claim 5, characterized in that, Each set of the sliding structure includes at least two sliders, the at least two sliders in the same set are spaced apart along the axial direction of the back roller, and the at least two sliders in the same set are slidably connected to the same guide rail in position.

7. The coating equipment as described in claim 4, characterized in that, The fixed base is provided with a first fixed block and a second fixed block. The first fixed block, the connecting block, and the second fixed block are arranged along the axial direction of the back roller. One end of the transmission rod is rotatably connected to the first fixed block, and the other end of the transmission rod is rotatably connected to the second fixed block.

8. The coating equipment as described in claim 3, characterized in that, Along a direction perpendicular to the axial direction of the back roller, the mounting base is provided with a positioning plate on the side facing the back roller. The positioning plate extends along the axial direction of the back roller, and the second die head abuts against the positioning plate on the side facing the back roller.

9. The coating equipment as described in claim 2, characterized in that, The coating equipment also includes a drying device for drying the second film area; Along the conveying direction of the substrate, the second die head, the second detection unit, and the drying device are arranged in sequence.

10. The coating equipment as described in claim 9, characterized in that, Along the conveying direction of the substrate, the first die head, the first detection unit, and the second die head are arranged sequentially, and the first coating mechanism and the first detection unit are respectively arranged upstream of the second die head.

11. The coating equipment as described in claim 2, characterized in that, The coating equipment also includes a drying device for drying the second film area; Along the conveying direction of the substrate, the second die head, the drying device, and the second detection unit are arranged in sequence.

12. A battery production line, characterized in that, The battery production line includes the coating equipment as described in any one of claims 1 to 11.

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