Coating equipment and battery production line

Abstract

The utility model discloses coating equipment and a battery production line, and relates to the technical field of battery production. The coating mechanism of the coating equipment comprises a coating die head and at least one roller piece, wherein the roller piece comprises a first back roller, a middle roller and a second back roller; the coating die head comprises a first die head body and a second die head body, the discharging end of the first die head body and the discharging end of the second die head body face the first back roller and the second back roller respectively, at least one of the first back roller, the middle roller and the second back roller is provided with a heating structure, and the coating oven is arranged on the downstream of the heating structure. Fluid channels of the heating structure and the coating drying oven are communicated, so that the total number of heating equipment is reduced; the first back roller, the middle roller and the second back roller are close to the coating oven in the belt conveying direction of the metal base material, so that the initial temperature of the metal base material before entering the coating oven can be increased, the temperature change range is reduced, the heating uniformity degree of a film coating area and a blank area is improved, the risks of wrinkling of the film coating area and cracking of the blank area are reduced, and the service life of the metal base material is prolonged. And the quality of the pole piece is improved.

Description

TECHNICAL FIELD

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

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

[0003] In the related art, the substrate to be coated is pulled by a traction roller of a coating machine, the coiled substrate is pulled out from a unwinding mechanism and passes through a coating machine head, a coating oven and a winding device in a specific threading mode, wherein the winding device winds the coated and dried pole piece into a roll to facilitate the continuous production of the subsequent process.

[0004] For the coated and dried pole piece, the pole piece sometimes has quality problems such as wrinkling in the blank area and cracking in the coating film area, and the quality of the coated pole piece needs to be improved. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the present application is to provide a coating equipment and a battery production line to improve the quality of the coated pole piece.

[0006] To achieve the above-mentioned purpose, the coating equipment provided by the present application is used to coat a metal substrate to form a pole piece, the metal substrate includes a first surface and a second surface oppositely arranged in the thickness direction of the metal substrate, the coating equipment includes a rack, a coating mechanism, a heating structure and a coating oven, the coating mechanism includes a coating die head and at least one roller, the roller is rotatably arranged on the rack, the roller includes a first back roller, an intermediate roller and a second back roller arranged in sequence in the running direction of the metal substrate; the coating die head is arranged on the rack, the coating die head has a discharge end, and the discharge end faces one of the rollers; the coating die head includes a first die head and a second die head arranged in sequence in the running direction of the metal substrate, the discharge end of the first die head faces the first back roller, and the first die head is used for coating on the first surface; the discharge end of the second die head faces the second back roller, and the second die head is used for coating on the second surface; at least one of the first back roller, the intermediate roller and the second back roller is provided with the heating structure, the heating structure includes a first fluid channel; the coating oven is arranged downstream of the heating structure in the running direction of the metal substrate, and the coated metal substrate is used to pass through the coating oven; the coating oven is provided with a second fluid channel, the first fluid channel and the second fluid channel are respectively used to access a heating fluid, and the first fluid channel communicates with the second fluid channel.

[0007] The coating device provided by the application can conduct heat to the metal substrate by the heating structure upstream of the coating oven to increase the initial temperature of the metal substrate before entering the coating oven, reduce the temperature variation range of the coated metal substrate in the coating oven, improve the heating uniformity of the coating film area and the blank area of the metal substrate, reduce the difference in the extension degree of the coating film area and the blank area, thereby reducing the risk of wrinkles in the coating film area and cracking in the blank area, and improving the quality of the coated pole piece. In addition, the first back roller, the intermediate roller and the second back roller are close to the coating oven in the running direction of the metal substrate, and at least one of the first back roller, the intermediate roller and the second back roller is provided with a heating structure, thereby reducing heat loss of the metal substrate before entering the coating oven, further reducing the temperature variation range of the coated metal substrate in the coating oven, and further reducing the risk of wrinkles in the coating film area and cracking in the blank area. On the other hand, the first fluid channel is in communication with the second fluid channel, so that the heating structure can directly use the heating fluid of the coating oven to preliminarily heat and warm up the metal substrate, thereby reducing the overall number of heating devices.

[0008] In some implementations, the coating oven includes a first oven and a second oven, the first oven is arranged between the first back roller and the intermediate roller in the running direction of the metal substrate, and the second back roller is arranged between the intermediate roller and the second oven in the running direction of the metal substrate; the first back roller is provided with the heating structure, and at least one of the intermediate roller and the second back roller is provided with the heating structure.

[0009] At this time, the first back roller is provided with a heating structure, and the first oven is arranged between the first back roller and the intermediate roller in the running direction of the metal substrate, thereby reducing the distance between the heating structure and the first oven, further reducing the heat loss of the metal substrate, and further reducing the risk of wrinkles in the coating film area and cracking in the blank area; at least one of the intermediate roller and the second back roller is provided with a heating structure, and the second back roller is arranged between the intermediate roller and the second oven in the running direction of the metal substrate, thereby reducing the distance between the heating structure and the second oven, further reducing the heat loss of the metal substrate, and further reducing the risk of wrinkles in the coating film area and cracking in the blank area.

[0010] In some implementations, the first fluid channel is spirally arranged along the axis of the roller.

[0011] At this time, the first fluid channel is spirally arranged along the axial line of the roller, so as to facilitate uniform heating of the roller, improve the uniformity of deformation of the roller, reduce the surface jump of the roller during rotation, and thus improve the deformation stability of the metal substrate at the roller.

[0012] In some implementations, the first fluid channel comprises at least one bending section.

[0013] At this time, the first fluid channel comprises at least one bending section, which facilitates uniform heating of the roller where the heating structure is located.

[0014] In some implementations, the first fluid channel comprises at least two sub-channel sections arranged side by side in the circumferential direction or the axial direction of the roller.

[0015] At this time, the at least two sub-channel sections arranged side by side in the circumferential direction or the axial direction of the roller facilitate uniform heating of the roller, improve the uniformity of deformation of the roller, reduce the surface jump of the roller during rotation, and thus improve the deformation stability of the metal substrate at the roller.

[0016] In some implementations, the coating device further comprises a first temperature detection device facing the metal substrate, the first temperature detection device being configured to detect the temperature of the metal substrate after being heated by the heating structure; and an adjusting device having a signal input end connected to the first temperature detection device and being connected to the heating structure, the adjusting device being configured to adjust the heating power of the heating structure according to the detected temperature of the metal substrate.

[0017] At this time, the first temperature detection device detects the temperature of the metal substrate after being heated, and the adjusting device adjusts the heating power of the heating structure according to the detected temperature of the metal substrate, so as to more accurately heat the metal substrate to a set temperature by the roller.

[0018] In some implementations, the coating device further comprises a second temperature detection device arranged at the roller having the heating structure; and the signal input end of the adjusting device is further connected to the second temperature detection device, and the adjusting device is configured to adjust the heating power of the heating structure according to the detected temperature of the roller, the detected temperature of the metal substrate, and a target temperature of the metal substrate.

[0019] At this time, the second temperature detection device can detect the temperature of the roller, and the adjusting device adjusts the heating power of the heating structure according to the detected temperature of the roller, the detected temperature of the metal substrate, and the target temperature of the metal substrate, which facilitates more comprehensive adjustment of the heating power and timely discovery of abnormal conditions of the roller during the heating process.

[0020] In some implementations, the adjusting device comprises a flow valve; a signal input end of the flow valve is connected with the first temperature detecting device, and the flow valve is used for adjusting the flow of the heating fluid in the first fluid channel according to the detected temperature of the metal base material.

[0021] At this time, the flow valve adjusts the flow of the heating fluid in the first fluid channel according to the detected temperature of the metal base material, so that the heating power of the heating structure can be quickly adjusted through the flow valve.

[0022] In some implementations, the coating device further comprises a cooling structure, and the roller member with the heating structure is provided with the cooling structure.

[0023] At this time, the cooling structure can cool the roller member with the heating structure, which is beneficial to prevent the roller member from overheating and improve the use safety of the roller member.

[0024] The application also provides a battery production line, which comprises the above coating device.

[0025] The battery production line provided by the application can improve the initial temperature of the metal base material before entering the coating oven by conducting heat to the metal base material through the heating structure upstream of the coating oven, reduce the temperature variation range of the coated metal base material in the coating oven, improve the heating uniformity of the coating film area and the blank area of the metal base material, reduce the difference in the extension degree of the coating film area and the blank area of the metal base material, thereby reducing the risk of wrinkles in the coating film area and cracking in the blank area, and improving the quality of the coated pole piece. BRIEF DESCRIPTION OF DRAWINGS

[0026] 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 embodiment or prior art description. Obviously, the drawings in the following description are only 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.

[0027] Figure 1 The schematic diagram of the power consumption equipment corresponding to an embodiment of the coating device provided by the application;

[0028] Figure 2 The schematic diagram of the battery device corresponding to an embodiment of the coating device provided by the application;

[0029] Figure 3 The exploded view of the battery monomer corresponding to an embodiment of the coating device provided by the application;

[0030] Figure 4 Partial structure schematic diagram of an embodiment of the coating equipment provided in the present application;

[0031] Figure 5 Schematic diagram of an embodiment of the coating equipment provided in the present application;

[0032] Figure 6 Hardware connection schematic diagram of an embodiment of the coating equipment provided in the present application.

[0033] Explanation of reference numerals:

[0034] 10, electric equipment; 11, electric controller; 12, motor;

[0035] 20, battery device; 21, battery box; 22, battery monomer assembly;

[0036] 221, battery monomer; 222, shell; 223, pole; 224, bare battery core;

[0037] 300, coating equipment;

[0038] 310, coating die; 311, first die; 312, second die; 313, discharge end;

[0039] 320, roller; 321, first back roller; 322, second back roller; 323, intermediate roller;

[0040] 330, heating structure; 340, coating oven; 341, first oven; 342, second oven;

[0041] 351, first temperature detection device; 352, second temperature detection device; 353, equipment controller;

[0042] 360, adjusting device; 371, first abutting roller; 372, second abutting roller;

[0043] 381, unwinding mechanism; 382, winding mechanism;

[0044] 400, metal base material; 401, first surface; 402, second surface.

[0045] 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

[0046] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0047] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0048] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, 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" appearing throughout the text means that the three parallel schemes include A scheme, or B scheme, or A and B schemes are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0049] With the application and popularization of lithium ion batteries in electric vehicles, communication equipment, portable electronic products, aerospace, ships and other equipment and facilities, the requirements for high endurance mileage and safety performance of the batteries are becoming higher and higher, and the coating process of the lithium ion battery pole piece also faces higher requirements.

[0050] In the related art, the substrate to be coated is pulled by the pulling roller of the coating machine, the coiled substrate is pulled out from the unwinding mechanism and passes through the coating machine head, the coating oven and the winding device along a specific threading mode, and the winding device winds the coated and dried pole piece into a roll to facilitate the continuous production of the subsequent process.

[0051] For the coated and dried pole piece, the pole piece sometimes has quality problems such as wrinkles in the blank area and cracks in the coating film area, and the quality of the coated pole piece needs to be improved.

[0052] Based on the above considerations, in order to improve the quality of the coated pole piece, the application provides a coating device and a battery production line. Among them, the coating device and the battery production line can improve the uniformity of the heating of the coating film area and the blank area of the metal substrate, and reduce the difference in the extension degree of the coating film area and the blank area of the metal substrate.

[0053] Next, the coating device and the battery production line proposed by the application will be explained in detail.

[0054] Among them, the pole piece coated by the coating device 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.

[0055] The following embodiments are described by taking the electrical equipment as a vehicle for convenience of description. In the absence of obvious contradictions, the following embodiments can also be applicable to electrical equipment other than vehicles.

[0056] Reference Figure 1 The above electrical equipment 10 includes a battery device 20. Among them, the battery device 20 of the vehicle can be arranged at the bottom, head or tail of the vehicle, etc. The battery device 20 can be used for power supply of the vehicle, for example, the battery device 20 can be used as the operating power supply of the vehicle. The vehicle as the electrical equipment 10 can also include an electrical controller 11 and a motor 12, the electrical controller 11 is used to control the battery device 20 to supply power to the motor 12, for example, to supply power for the start, navigation and driving of the vehicle.

[0057] It can be understood that the battery device 20 can not only be used as the operating power supply of the vehicle as the electrical equipment 10, but also be used as the driving power supply of the vehicle, thereby completely or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0058] Reference Figure 2 The battery device 20 includes a battery box 21 and a battery cell assembly 22, and the battery cell assembly 22 is contained in the battery box 21. Among them, the battery device 20 (Battery Apparatus) mentioned in the embodiments of the application can include at least one battery cell assembly 22, and the battery cell assembly 22 is used to provide voltage and capacity. The battery cell assembly 22 (Battery Cell Assembly) can include at least one battery cell 221, and a plurality of battery cells 221 are connected in series, parallel or mixed connection through busbars (Busbar), wherein the mixed connection can be understood as including series and parallel connection.

[0059] 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 bundling a plurality of battery cells 221 with a cable tie. In some embodiments, the battery cell assembly 22 can be accommodated in the battery case 21 by being fixed in the battery case 21. Of course, the battery cell assembly 22 can include only one battery cell 221, and the present embodiment is not limited in this regard.

[0060] In some embodiments, the battery case 21 can include a first case and a second case. The first case and the second case are coupled to form a closed space inside the battery case 21 to accommodate the battery cell 221 or the battery cell assembly 22. Here, closed means covered or closed, which can be sealed or unsealed. It can be understood that the first case and the second case can each have an opening, so as to be coupled through the respective openings to form the closed space described above. Of course, one of the first case and the second case can have an opening, for example, the first case has no opening and the second case has an opening, and the present embodiment is not limited in this regard. The battery case 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 case 21 to accommodate the battery cell 221 or the battery cell assembly 22. The first case can be the top cover (or the bottom plate), and the second case can be the combination of the frame and the bottom plate (or the combination of the frame and the top cover) with an opening.

[0061] In some embodiments, the battery device can be a battery pack, which can include the battery case 21 and one or more battery cell assemblies 22 accommodated in the battery case 21. In some embodiments, the battery case 21 described above can be part of the chassis structure of the vehicle as the power consumption device 10. For example, the top cover of the battery case 21 can be at least part of the floor of the vehicle, or the frame of the battery case 21 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0062] 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 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 the battery case 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.

[0063] Referring toFigure 3 The battery cell 221 is composed of a positive electrode, a negative electrode, a separator, an electrolyte, etc., and can be charged and discharged through an electrochemical reaction. The battery cell 221 can be provided as a square cell, a cylindrical cell, a soft pack cell, or a strip cell, etc. The battery cell 221 includes a shell 222, a pole 223, and a bare cell 224, wherein the bare cell 224 can be formed by the pole piece through subsequent winding, laminating, etc., and is contained in the shell 222. The battery cell 221 includes the pole 223 of the positive electrode and the negative electrode; in the battery cell assembly 22, the pole 223 can be connected in series, parallel, or mixed connection form between the battery cells 221 through connection with the bus bars.

[0064] The pole piece for manufacturing the above-mentioned bare cell 224, as a positive electrode material, is usually an aluminum foil or a composite foil containing an aluminum layer as a substrate, and an active material such as lithium iron phosphate, lithium nickel cobalt manganese acid, or lithium nickel cobalt aluminum acid is coated on the substrate; as a negative electrode material, the pole piece is usually a copper foil or a composite foil containing a copper layer as a substrate, and an active material such as graphite or a graphite-like structure is coated on the substrate.

[0065] In actual production applications, it is found that because the thermal conductivity of aluminum and copper in the substrate is greater than that of the active material (lithium iron phosphate, lithium nickel cobalt manganese acid, lithium nickel cobalt aluminum acid, and graphite, etc.), if the coated substrate is directly sent into a coating oven for drying, the coating film area of the substrate (containing the above-mentioned active material) has relatively slow heat conduction and slow temperature rise, and the blank area of the substrate (aluminum, copper, etc. exposed outside) has relatively fast heat conduction and fast temperature rise, so that the extension degree of the coating film area of the substrate is less than that of the blank area, and sometimes quality problems such as cracking of the coating film area and wrinkling of the blank area occur.

[0066] Based on this, referring to Figure 4 In an embodiment of the present application, the coating device 300 for coating the metal substrate 400 to form the pole piece includes a rack, a coating mechanism, a heating structure 330, and a coating oven 340, the coating mechanism includes a coating die head 310 and at least one roller 320, the roller 320 is rotatably arranged on the rack; the coating die head 310 is arranged on the rack, and the coating die head 310 has a discharge end 313 facing one of the rollers 320; the heating structure 330 is arranged on at least one roller 320, and the coating oven 340 is arranged downstream of the heating structure 330 in the conveying direction of the metal substrate 400, and the coated metal substrate 400 is used to pass through the coating oven 340.

[0067] The metal base 400 can be the above-mentioned aluminum foil or composite foil containing an aluminum layer, copper foil or composite foil containing a copper layer, etc., i.e., the metal base 400 can be understood as a base containing a metal layer. In addition, the metal base 400 is in a strip shape; wherein Figure 4 The running direction of the metal base 400 can refer to the direction corresponding to the dashed arrow in the figure, for example Figure 4 The running direction of the metal base 400 is in the direction from left to right as a whole. It can be understood that coating is to coat a thin layer of coating material in liquid or powder form on the surface of an object such as fabric, paper, metal foil or plate, etc., for example, to uniformly, continuously or discontinuously coat the prepared paste-like thick paste (positive active material or negative active material) on the base (including positive current collector or negative current collector), for example, to coat lithium iron phosphate, nickel cobalt manganese lithium, nickel cobalt aluminum lithium and graphite, etc. on the metal base 400 in this embodiment. In addition, the metal base 400 includes a first surface 401 and a second surface 402 oppositely arranged in the thickness direction of the metal base 400, for example, the first surface 401 can be understood as the front surface of the metal base 400, and the second surface 402 can be understood as the back surface of the metal base 400.

[0068] The rack can be understood as a mounting base for mounting the coating mechanism, the roller 320 and other components, and the rack can be assembled from components such as pipes and plates.

[0069] The roller 320 can be understood as a component in the shape of a cylinder as a whole, which can rotate around its own axis. The roller 320 can include a back roller oppositely arranged with the coating die 310, a traction roller providing traction power, a non-traction roller, etc. The surface of the metal base 400 can abut against the outer peripheral surface of the roller 320, so that the running of the metal base 400 is realized by the rotation of the roller 320, realizing the forward transportation of the metal base 400; it can be understood that during the running of the metal base 400, the metal base 400 can be attached to the surface of the roller 320. In addition, the roller 320 can be rotatable relative to the rack through shaft hole fitting structure, bearing and other structures. In some embodiments, referring to Figure 5 The roller 320 includes a first back roller 321, an intermediate roller 323 and a second back roller 322 arranged in sequence in the running direction of the metal base 400, wherein the intermediate roller 323 can be understood as a roller arranged between the first back roller 321 and the second back roller 322. The intermediate roller 323 can be arranged as a traction roller, so as to be able to provide traction force for the transportation of the metal base 400; of course, the intermediate roller 323 can also be arranged as a non-traction roller.

[0070] The coating die 310 can be understood as a slurry output member of the coating mechanism. The coating die 310 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 coating die 310 through a pipeline or the like, and then coat the metal substrate 400 through the coating die 310. The coating die 310 can be arranged on the rack in a fixed connection, a movable connection or the like, for example, by clamping, clamping or the like. The embodiment does not limit this. One of the roller members 320 towards which the discharge end 313 of the coating die 310 faces can be a back roller. Thus, for the part of the metal substrate 400 on the back roller, the discharge end 313 of the coating die 310 outputs the slurry to the part of the metal substrate 400 on the back roller by facing the back roller, so as to realize coating of the metal substrate 400 by forward conveying (running) of the metal substrate 400. In some embodiments, referring to Figure 5 , the coating die 310 includes a first die 311 and a second die 312 arranged in sequence along the running direction of the metal substrate 400, which can be understood as the first die 311 and the second die 312 being arranged upstream and downstream of the conveying direction of the metal substrate 400, respectively.

[0071] The heating structure 330 can be understood as a member capable of heating, for example, the heating structure 330 can include an electric heating member, or the heating structure 330 can include a pipe member and be heated by a heating fluid in the pipe member. The embodiment does not limit this. The inside of the corresponding roller member 320 can be hollow to facilitate installation of the heating structure 330. Of course, the heating structure 330 can also be arranged on the surface of the roller member 320 for installation.

[0072] In some embodiments, referring to Figure 5 , the discharge end 313 of the first die 311 faces the first back roller 321, and the first die 311 is used for coating on the first surface 401, which can be understood as the slurry output by the first die 311 being capable of being coated on the part of the metal substrate 400 on the first back roller 321. The discharge end 313 of the second die 312 faces the second back roller 322, and the second die 312 is used for coating on the second surface 402, which can be understood as the slurry output by the second die 312 being capable of being coated on the part of the metal substrate 400 on the second back roller 322. At least one of the first back roller 321, the intermediate roller 323 and the second back roller 322 is provided with a heating structure 330, for example, the first back roller 321 and the second back roller 322 can be respectively provided with the above-mentioned heating structure 330, or the first back roller 321 and the intermediate roller 323 can be respectively provided with the above-mentioned heating structure 330, or the first back roller 321, the intermediate roller 323 and the second back roller 322 can be respectively provided with the above-mentioned heating structure 330.

[0073] The coating oven 340 can be understood as a box-shaped member that dries the metal substrate 400 coated with the slurry by means of baking, for example, the coating oven 340 can be a convection drying oven, an infrared drying oven, a magnetic induction heating oven, etc., for example, the coating oven 340 can bake the solvent in the slurry by means of hot air to dry the slurry, so that the slurry is better adhered to the metal substrate 400. It can be understood that the coating oven 340 has an inner cavity and an inlet and an outlet communicating with the inner cavity, so that the coated metal substrate 400 can pass through the coating oven 340 by passing through the inlet, the inner cavity and the outlet of the coating oven 340.

[0074] In addition, referring to Figure 5 , the coating device 300 can further include an unwinding mechanism 381 and a winding mechanism 382, the unwinding mechanism 381 is used to output the metal substrate 400, and the winding mechanism 382 is used to wind the coated metal substrate 400. Wherein, the unwinding mechanism 381 can include an unwinding roller and a corresponding motor and transmission mechanism, the two ends of the unwinding roller are connected to the rack through the pivot, the corresponding motor of the unwinding roller can be fixed on the rack, and the output shaft of the motor is connected with the unwinding roller through the transmission mechanism, so that the unwinding roller is driven by the motor to output the metal substrate 400 to be coated, for example, along the direction of the dashed arrow on the unwinding mechanism 381 in the figure. Figure 5 The winding mechanism 382 can include a winding roller and a corresponding motor and transmission mechanism, the two ends of the winding roller are connected to the rack through the pivot, the corresponding motor of the winding roller can be fixed on the rack, and the output shaft of the motor is connected with the winding roller through the transmission mechanism, so that the winding roller is driven by the motor to wind the coated metal substrate 400, for example, along the direction of the dashed arrow on the winding mechanism 382 in the figure. Figure 5 The winding mechanism 382 can include a winding roller and a corresponding motor and transmission mechanism, the two ends of the winding roller are connected to the rack through the pivot, the corresponding motor of the winding roller can be fixed on the rack, and the output shaft of the motor is connected with the winding roller through the transmission mechanism, so that the winding roller is driven by the motor to wind the coated metal substrate 400, for example, along the direction of the dashed arrow on the winding mechanism 382 in the figure.

[0075] Referring to the above analysis, it can be known that the coating device 300 in the above embodiment can, when in use, refer to Figure 4 For the metal substrate 400 with low temperature itself entering the workshop for use, the heating structure 330 upstream of the coating oven 340 can conduct heat to the metal substrate 400 to warm up the metal substrate 400, improve the initial temperature of the metal substrate 400 before entering the coating oven 340, reduce the temperature change range of the coated metal substrate 400 in the coating oven 340, improve the heating uniformity of the coating film area and the blank area of the metal substrate 400, reduce the difference of the extension degree of the coating film area and the blank area of the metal substrate 400, thereby reducing the risk of wrinkling in the coating film area and cracking in the blank area, and improving the quality of the coated metal substrate.

[0076] In addition, the first back roller 321, the intermediate roller 323 and the second back roller 322 are relatively close to the coating ovens 340 (for example, the first oven 341 and the second oven 342 in FIG. 5) in the conveying direction of the metal substrate 400, the metal substrate 400 heated by the heating structure 330 has a short conveying time from the heating structure 330 to the coating ovens 340, and at least one of the first back roller 321, the intermediate roller 323 and the second back roller 322 is provided with the heating structure 330, thereby facilitating the reduction of heat loss of the metal substrate 400 before entering the coating ovens 340, facilitating the further reduction of the temperature variation range of the coated metal substrate 400 in the coating ovens 340, and facilitating the further reduction of the risk of wrinkling in the coating area and cracking in the white area.

[0077] In some embodiments, with reference to Figure 5 , the coating ovens 340 include a first oven 341 and a second oven 342, the first oven 341 is arranged between the first back roller 321 and the intermediate roller 323 in the conveying direction of the metal substrate 400, and it can be understood that the first back roller 321, the first oven 341 and the intermediate roller 323 are arranged in sequence in the conveying direction of the metal substrate 400; and the first back roller 321 is provided with the heating structure 330.

[0078] In this embodiment, the first back roller 321 is provided with the heating structure 330, and the first oven 341 is arranged between the first back roller 321 and the intermediate roller 323 in the conveying direction of the metal substrate 400, thereby facilitating the reduction of the distance between the heating structure 330 and the first oven 341, facilitating the further reduction of the heat loss of the metal substrate 400, and facilitating the further reduction of the risk of wrinkling in the coating area and cracking in the white area.

[0079] In some embodiments, with reference to Figure 5 , the second back roller 322 is arranged between the intermediate roller 323 and the second oven 342 in the conveying direction of the metal substrate 400, and it can be understood that the intermediate roller 323, the second back roller 322 and the second oven 342 are arranged in sequence in the conveying direction of the metal substrate 400; and at least one of the intermediate roller 323 and the second back roller 322 is provided with the heating structure 330, for example, the intermediate roller 323 and the second back roller 322 are respectively provided with the heating structure 330, or only the second back roller 322 is provided with the heating structure 330, or only the intermediate roller 323 is provided with the heating structure 330.

[0080] In this embodiment, at least one of the intermediate roller 323 and the second back roller 322 is provided with the heating structure 330, and the second back roller 322 is arranged between the intermediate roller 323 and the second oven 342 in the conveying direction of the metal substrate 400, so as to facilitate reducing the distance between the heating structure 330 and the second oven 342, further reducing the heat loss of the metal substrate 400, and further reducing the risk of wrinkling in the coating area and cracking in the blank area.

[0081] In some optional embodiments, referring to Figure 5 The roller assembly 320 further comprises at least one first abutting roller 371, which is rotatably arranged on the rack, for example, the first abutting roller 371 can be rotatable relative to the rack through shaft hole fitting structure, bearing or other structure; wherein the first abutting roller 371 can be arranged as a non-dragging roller or a dragging roller, and the present embodiment does not limit this. Wherein the first abutting roller 371 is arranged upstream of the roller assembly 320 provided with the heating structure 330 in the conveying direction of the metal substrate 400, for example, the first abutting roller 371 is arranged upstream of the first back roller 321 in the conveying direction of the metal substrate 400; wherein the first abutting roller 371 is not provided with the above-mentioned heating structure 330, which can be understood as that the first abutting roller 371 does not have the heating function for the metal substrate 400.

[0082] In this embodiment, the first abutting roller 371 is far away from the coating oven 340 (for example, the first oven 341), and the first abutting roller 371 is not provided with the above-mentioned heating structure 330, which is conducive to avoiding excessive heat loss of the metal substrate 400 during transmission, and reducing the overall heat loss of the coating equipment 300.

[0083] In some optional embodiments, referring to Figure 5 The roller assembly 320 further comprises at least one second abutting roller 372, which is rotatably arranged on the rack, for example, the second abutting roller 372 can be rotatable relative to the rack through shaft hole fitting structure, bearing or other structure; the second abutting roller 372 is arranged downstream of the second oven 342 in the conveying direction of the metal substrate 400, and the second abutting roller 372 is not provided with the heating structure 330, which can be understood as that the second abutting roller 372 does not have the heating function for the metal substrate 400.

[0084] In this embodiment, the second abutting roller 372 is not provided with the above-mentioned heating structure 330, which is conducive to reducing the overall heat loss of the coating equipment 300.

[0085] In some embodiments, the coating device 300 can further comprise a first thickness gauge arranged between the first oven 341 and the intermediate roller 323 in the conveying direction of the metal substrate 400, and the first thickness gauge is configured to detect the thickness of the coating on the first surface 401 of the metal substrate 400, so as to timely find out the abnormal coating condition. In addition, the coating device 300 can further comprise a second thickness gauge arranged after the second oven 342 in the conveying direction of the metal substrate 400, and the second thickness gauge is configured to detect the thickness of the coating on the second surface 402 of the metal substrate 400, so as to timely find out the abnormal coating condition.

[0086] On the other hand, in the conveying direction of the metal substrate 400, the coating device 300 can further comprise a visual detection device, such as a visual camera, arranged after the second oven 342, and the visual detection device is configured to detect the edge position of the coating on the first surface 401 and the edge position of the coating on the second surface 402, so as to timely feedback the edge alignment of the coating on the first surface 401 and the coating on the second surface 402, and facilitate timely adjustment of the coating device 300.

[0087] In some embodiments, the heating structure 330 comprises a first fluid passage, which can be formed by a pipe, or can be formed by hollowing the solid part of the roller 320. For example, the first fluid passage can be a capillary heat pipe, and the first fluid passage in the form of a capillary heat pipe can be arranged to fit the outer surface of the roller 320; wherein the roller 320 can be the first back roller 321, the second back roller 322, or the intermediate roller 323. The coating oven 340 is provided with a second fluid passage, for example, the first oven 341 and the second oven 342 can be provided with the second fluid passage respectively; the second fluid passage can be formed by a pipe, or can be formed by hollowing the solid part of the coating oven 340. The first fluid passage and the second fluid passage are respectively configured to access a heating fluid, which can be hot oil, hot water, hot gas, etc.; the first fluid passage and the second fluid passage are in communication, for example, through pipes, pipe joints, etc.

[0088] It can be understood that, in the case of rotation of the roller 320, the roller 320 can be connected to the external device through a certain length of hose, a sliding contact joint, etc. In addition, the heating fluid can flow into the roller 320 upstream of the rotation direction of the roller 320, or can flow into the roller 320 from the downstream or the middle, which is not limited in the present embodiment. In addition, the outside of the roller 320 with the heating structure 330 can be provided with a cover to prevent heat from being lost too quickly to the external environment such as the workshop space.

[0089] In this embodiment, the first fluid channel is in communication with the second fluid channel, so that the heating structure 330 can directly use the heating fluid of the coating oven 340 to preliminarily heat the metal substrate 400, which is beneficial to reduce the overall number of heating devices, and it can be understood that the need for the heating structure 330 to additionally provide a supply source of the heating fluid is reduced.

[0090] In some embodiments, the first fluid channel of the heating structure 330 is spirally arranged along the axial line of the roller member 320, and it can be understood that the part of the heating structure 330 arranged on the roller member 320 is in a spiral shape, and the roller member 320 can be the first back roller 321, the second back roller 322, or the intermediate roller 323.

[0091] It can be understood that, during the conveying of the metal substrate 400, the metal substrate 400 is continuously conveyed forward under the action of a traction force, and the traction force brings tensile deformation to the metal substrate 400. In this embodiment, the first fluid channel is spirally arranged along the axial line of the roller member 320, which is beneficial to uniformly heat the roller member 320, beneficial to improve the deformation uniformity of the roller member 320, and beneficial to reduce the surface jumping of the roller member 320 during rotation, thereby beneficial to improve the deformation stability of the metal substrate 400 at the roller member 320, and it can be understood that the surface jumping of the roller member 320 is avoided from being too large to cause the tensile deformation of the metal substrate 400 to change too much.

[0092] In some alternative embodiments, the first fluid channel can also include at least one bending section, for example, two or more bending sections, for example, the bending section can be arranged in a U shape, an S shape, an L shape, etc., which is also beneficial to uniformly heat the roller member 320 on which the heating structure 330 is arranged.

[0093] In some alternative embodiments, the first fluid channel includes at least two sub-channel sections arranged side by side in the circumferential direction or the axial direction of the roller member 320, and it can be understood that the first fluid channel adopts a multi-channel design; and the roller member 320 can be the first back roller 321, the second back roller 322, or the intermediate roller 323.

[0094] In this embodiment, the at least two sub-channel sections arranged side by side in the circumferential direction or the axial direction of the roller member 320 are beneficial to uniformly heat the roller member 320, beneficial to improve the deformation uniformity of the roller member 320, and beneficial to reduce the surface jumping of the roller member 320 during rotation, thereby beneficial to improve the deformation stability of the metal substrate 400 at the roller member 320.

[0095] In some embodiments, referring to Figure 6 , the coating device 300 further includes a first temperature detection device 351 and an adjusting device 360 (in combination with Figure 5), the first temperature detection device 351 faces the metal substrate 400, and the first temperature detection device 351 is used to detect the temperature of the metal substrate 400 after being heated by the heating structure 330; wherein, the first temperature detection device 351 can be installed on the above-mentioned rack, and the first temperature detection device 351 can be set to an infrared sensor, a thermocouple, a thermistor or other temperature sensor.

[0096] The signal input terminal of the regulating device 360 ​​is connected to the first temperature detection device 351, which can be understood as the signal containing the detected temperature of the metal substrate 400 being able to be transmitted to the regulating device 360. The regulating device 360 ​​is connected to the heating structure 330 and is used to adjust the heating power of the heating structure 330 based on the detected temperature of the metal substrate 400. The regulating device 360 ​​can be understood as a device capable of adjusting the heating power of the heating structure 330, and the heating power can be understood as the amount of heat output by the heating structure 330 per unit time. For example, the heating structure 330 can be an electric heating device, and the regulating device 360 ​​can be a component that adjusts the current, voltage, or resistance of the electric heating device; alternatively, the heating structure 330 is heated by passing a heating fluid through a fluid channel, and the regulating device 360 ​​can be a device that adjusts the flow rate and temperature of the heating fluid accordingly.

[0097] In some embodiments, reference Figure 6 The coating device 300 may further include a device controller 353. The first temperature detection device 351 is connected to the signal input terminal of the device controller 353, and the signal input terminal of the regulating device 360 ​​is connected to the signal output terminal of the device controller 353. The device controller 353 converts the temperature detection signal of the first temperature sensor into a signal type that can be used by the regulating device 360. It can be understood that the first temperature detection device 351 is indirectly connected to the regulating device 360 ​​through the device controller 353. The device controller 353 can be configured to include a host computer (Host Computer) and a slave device (Slave Device). The host computer can be understood as a computer system with strong computing and data processing capabilities, including but not limited to a personal computer, an industrial computer, or a server. The slave device can be configured as a device or controller directly connected to hardware such as sensors and actuators in the control system. The slave device usually performs simple logical judgment and real-time control tasks. The hardware of the slave device usually includes a microcontroller, a PLC (Programmable Logic Controller), an embedded control board, etc.

[0098] In this embodiment, the first temperature detection device 351 detects the temperature of the heated metal base material 400, and the adjusting device 360 adjusts the heating power of the heating structure 330 according to the detected temperature of the metal base material 400, so as to facilitate the roller 320 to heat the metal base material 400 to the set temperature more accurately.

[0099] In some embodiments, referring to Figure 5 and Figure 6 , the coating device 300 further comprises a second temperature detection device 352 arranged on the roller 320 with the heating structure 330, and the second temperature detection device 352 can be a temperature sensor such as an infrared sensor, a thermocouple, a thermistor, etc. In this embodiment, a plurality of second temperature detection devices 352 can be arranged on the surface and inside of the roller 320 with the heating structure 330, and the second temperature detection device 352 can be a temperature sensor with higher accuracy.

[0100] The signal input end of the adjusting device 360 is further connected with the second temperature detection device 352, and the adjusting device 360 is used to adjust the heating power of the heating structure 330 according to the detected temperature of the roller 320, the detected temperature of the metal base material 400 and the target temperature of the metal base material 400; for example, referring to Figure 6 , the second temperature detection device 352 can be connected with the signal input end of the device controller 353, and the signal output end of the device controller 353 is connected with the signal input end of the adjusting device 360, and the device controller 353 is further used to access the target temperature of the metal base material 400, wherein the target temperature of the metal base material 400 can be stored by a memory, a cloud server, etc., and the target temperature of the metal base material 400 can also be input by a keyboard, a touch panel, etc. input device; in some embodiments, the target temperature is set in response to the input signal, and it can be understood that the target temperature can be modified. In addition, the coating device 300 can be configured to monitor and record the temperature data of the above-mentioned first temperature detection device 351 and second temperature detection device 352, and can be configured to have data processing functions such as forming a table record and forming a temperature curve, so as to facilitate the real-time monitoring of the temperature change of the roller 320.

[0101] In this embodiment, the second temperature detection device 352 can detect the temperature of the roller 320, and the adjusting device adjusts the heating power of the heating structure 330 according to the detected temperature of the roller 320, the detected temperature of the metal base material 400 and the target temperature of the metal base material 400, so as to facilitate more comprehensive adjustment of the heating power and timely discovery of abnormal conditions of the roller 320 in the heating process. For example, the detected temperature of the roller 320 detected by the second temperature detection device 352 can be used as a reference to prevent the roller 320 from being deformed seriously due to excessive temperature.

[0102] In some embodiments, when the heating structure 330 comprises the first fluid channel as described above, the adjusting device 360 can comprise a flow valve; a signal input end of the flow valve is connected with the first temperature detecting device 351, for example, can be indirectly connected through the above-mentioned equipment controller 353, and the flow valve is used for adjusting the flow of the heating fluid in the first fluid channel according to the detected temperature of the metal base material 400, for example, increasing the flow of the heating fluid in the first fluid channel when the detected temperature of the metal base material 400 is too low, and reducing the flow of the heating fluid in the first fluid channel when the detected temperature of the metal base material 400 is too high. In some embodiments, the coating equipment 300 can adopt an existing PLC control algorithm to dynamically adjust the flow of the heat conducting oil by adjusting the flow valve according to the feedback signals of the first temperature detecting device 351 and the second temperature detecting device 352, so as to facilitate the precise constant temperature control of the temperature of the roller 320 by controlling the flow through the flow valve, for example, the temperature control precision requirement of the roller 320 can be set to ±1 degree Celsius. In some embodiments, the control module of the heating structure 330 can be communicatively connected with the equipment controller 353 of the coating equipment 300, so as to automatically control the heating structure 330 to heat up when the coating oven 340 is started to heat up, thereby reducing the start-up waiting time and improving the production efficiency.

[0103] In this embodiment, the flow valve adjusts the flow of the heating fluid in the first fluid channel according to the detected temperature of the metal base material 400, so as to quickly adjust the heating power of the heating structure 330 through the flow valve.

[0104] In some embodiments, the coating equipment 300 further comprises a cooling structure, and the roller 320 with the heating structure 330 is provided with the cooling structure. The cooling structure can be a liquid cooling pipe, an air cooling pipe, a cooling fan, etc. The roller 320 can be the first back roller 321, the second back roller 322, or the intermediate roller 323. In some embodiments, the coating equipment 300 can further be provided with an over-temperature alarm module, a power-off protection module, and a dry burning prevention module for the roller 320, so as to improve the safety of the equipment.

[0105] In this embodiment, the cooling structure can cool the roller 320 with the heating structure 330, for example, cooling the roller 320 with the heating structure 330 after the coating equipment 300 is stopped, which is beneficial to prevent the roller 320 from overheating and improve the safety of the roller 320.

[0106] Referring to Figure 4 , Figure 5 and Figure 6In an embodiment, the coating device 300 is used for coating the metal substrate 400 to form an electrode tab, the coating device 300 comprises a rack, a coating mechanism, a heating structure 330 and a coating oven 340, the coating mechanism comprises a coating die head 310 and at least one roller 320, the roller 320 is rotatably arranged on the rack; the coating die head 310 is arranged on the rack, the coating die head 310 has a discharge end 313, the discharge end 313 faces one of the rollers 320; the heating structure 330 is arranged on the at least one roller 320; the coating oven 340 is arranged downstream of the heating structure 330 in the conveying direction of the metal substrate 400, and the coated metal substrate 400 is used to pass through the coating oven 340. The coating die head 310 comprises a first die head 311 and a second die head 312 arranged in sequence in the conveying direction of the metal substrate 400, and the roller 320 comprises a first back roller 321, an intermediate roller 323 and a second back roller 322 arranged in sequence in the conveying direction of the metal substrate 400; the metal substrate 400 comprises a first surface 401 and a second surface 402 arranged oppositely in the thickness direction of the metal substrate 400, the discharge end 313 of the first die head 311 faces the first back roller 321, and the first die head 311 is used for coating on the first surface 401; the discharge end 313 of the second die head 312 faces the second back roller 322, and the second die head 312 is used for coating on the second surface 402, and at least one of the first back roller 321, the intermediate roller 323 and the second back roller 322 is provided with the heating structure 330. The coating oven 340 comprises a first oven 341 and a second oven 342, the first oven 341 is arranged between the first back roller 321 and the intermediate roller 323 in the conveying direction of the metal substrate 400, and the second back roller 322 is arranged between the intermediate roller 323 and the second oven 342 in the conveying direction of the metal substrate 400; at least one of the first back roller 321, the intermediate roller 323 and the second back roller 322 is provided with the heating structure 330. The heating structure 330 comprises a first fluid channel, the coating oven 340 is provided with a second fluid channel, the first fluid channel and the second fluid channel are respectively used for accessing a heating fluid, and the first fluid channel communicates with the second fluid channel. The heating structure 330 comprises a first fluid channel, the first fluid channel is spirally arranged along the axial line of the roller 320. The heating structure 330 comprises a first fluid channel, the first fluid channel comprises at least two sub-channel segments, and the sub-channel segments are arranged side by side in the circumferential direction or the axial direction of the roller 320. The coating device 300 further comprises a first temperature detection device 351 and an adjusting device 360, the first temperature detection device 351 faces the metal substrate 400, and the first temperature detection device 351 is used for detecting the temperature of the metal substrate 400 heated by the heating structure 330; a signal input end of the adjusting device 360 is connected with the first temperature detection device 351, the adjusting device 360 is connected with the heating structure 330, and the adjusting device 360 is used for adjusting the heating power of the heating structure 330 according to the detected temperature of the metal substrate 400.The coating device 300 further comprises a second temperature detection device 352 arranged on the roller member 320 with the heating structure 330; a signal input end of the adjusting device 360 is further connected with the second temperature detection device 352, and the adjusting device 360 is used for adjusting the heating power of the heating structure 330 according to the detected temperature of the roller member 320, the detected temperature of the metal substrate 400 and the target temperature of the metal substrate 400. The heating structure 330 comprises a first fluid passage, and the adjusting device 360 comprises a flow valve; a signal input end of the flow valve is connected with the first temperature detection device 351, and the flow valve is used for adjusting the flow of the heating fluid in the first fluid passage according to the detected temperature of the metal substrate 400. The coating device 300 further comprises a cooling structure, and the roller member 320 with the heating structure 330 is arranged with the cooling structure.

[0107] In addition, the application further provides a battery production line, which comprises the above coating device 300.

[0108] On the other hand, the above coating device 300 can also be used according to a corresponding coating method; wherein the coating method can comprise the following steps:

[0109] The first step is to coat the metal substrate 400, for example, the metal substrate 400 can be coated by the above coating die head 310, and specifically, the first surface 401 of the metal substrate 400 can be coated by the above first die head 311, or the second surface 402 of the metal substrate 400 can be coated by the above second die head 312;

[0110] The second step is to heat the metal substrate 400 before entering the coating oven 340 by the roller member 320, wherein the heat of the roller member 320 can come from the above heating structure installed on the roller member 320, and the roller member 320 can be the above first back roller 321, the second back roller 322 or the intermediate roller 323;

[0111] The third step is to dry the coated metal substrate 400 by the coating oven 340, for example, the coated metal substrate 400 can be dried by the above coating oven 340, and specifically, the coating layer on the first surface 401 of the metal substrate 400 can be dried by the first oven 341, and the coating layer on the second surface 402 of the metal substrate 400 can be dried by the second oven 342.

[0112] For the coating method, in some embodiments, the step of heating the metal substrate 400 before entering the coating oven 340 by the roller member 320 (the above second step) comprises:

[0113] Sub-step one, obtaining the temperature of the metal substrate 400 after being heated before entering the coating oven 340, for example, by the above first temperature detection device 351;

[0114] Sub-step two, according to the temperature of the metal substrate 400, adjust the heating power for the metal substrate 400 before entering the coating oven 340, for example, by adjusting the device 360 described above.

[0115] In this embodiment, the coating method by obtaining the temperature of the metal substrate 400 and adjusting the heating power, so as to facilitate the roller 320 more accurately heated metal substrate 400 to the set temperature.

[0116] In some embodiments, the coating method further comprises the following steps:

[0117] Obtaining the temperature of the roller 320 for heating the metal substrate 400;

[0118] According to the temperature of the metal substrate 400, adjust the heating power for the metal substrate 400 before entering the coating oven 340 (sub-step two of the second step described above) includes:

[0119] According to the detected temperature of the roller 320, the detected temperature of the metal substrate 400 and the target temperature of the metal substrate 400, adjust the heating power for the metal substrate 400 before entering the coating oven 340; for example, the detected temperature of the roller 320 can be used as a reference to prevent the roller 320 from being deformed seriously due to excessive temperature.

[0120] In this embodiment, according to the detected temperature of the roller 320, the detected temperature of the metal substrate 400 and the target temperature of the metal substrate 400 to adjust the heating power for the metal substrate 400, it is beneficial to more comprehensive adjustment of the heating power, and it is beneficial to timely find the abnormal situation of the roller 320 in the heating process.

[0121] In some embodiments, the step of heating the metal substrate 400 before entering the coating oven 340 by the roller 320 (the second step described above) includes:

[0122] The roller 320 causes the metal substrate 400 to be heated by an amount greater than or equal to 0.5 times a preset temperature difference, where the preset temperature difference is the difference between the temperature of the metal substrate 400 after being heated in the coating oven 340 and the temperature of the metal substrate 400 before being heated by the roller 320. For example, if the temperature of the metal substrate 400 before being heated by the roller 320 is T1, and the temperature of the metal substrate 400 after being heated in the coating oven 340 is T2, then the preset temperature difference is equal to T2-T1. The temperature increase ΔT of the metal substrate 400 after passing through the roller 320 is ≥ (T2-T1)×0.5, and T1<T1+ΔT<T2. This means that the temperature of the metal substrate 400 at the roller 320 is raised to T1+ΔT. Furthermore, the roller 320 may be used to increase the temperature of the metal substrate 400 by a value ΔT greater than or equal to 0.6 times, 0.7 times, 0.8 times, or 0.9 times the preset temperature difference ( T2 − T1 ), which is not limited in this embodiment.

[0123] In this embodiment, the roller 320 is used to increase the temperature of the metal substrate 400 to be greater than or equal to 0.5 times the preset temperature difference, which is beneficial to further reduce the temperature variation range of the coated metal substrate 400 in the coating oven 340, thereby further reducing the risk of wrinkling in the coating area and cracking in the blank area.

[0124] It is understandable that, since the above-mentioned battery production line adopts all the technical solutions of all the embodiments of the above-mentioned coating equipment 300, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0125] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under 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 device is used to coat a metal substrate to form a pole piece, wherein the metal substrate includes a first surface and a second surface arranged opposite to each other in the thickness direction of the metal substrate, and the coating device includes: frame; A coating mechanism, the coating mechanism comprising a coating die and at least one roller, the roller being rotatably mounted on the frame, the roller comprising a first back roller, an intermediate roller, and a second back roller sequentially arranged along the running direction of the metal substrate; the coating die being mounted on the frame, the coating die having a discharge end, the discharge end facing one of the rollers; the coating die comprising a first die and a second die sequentially arranged along the running direction of the metal substrate, the discharge end of the first die facing the first back roller, the first die being used to coat the first surface; the discharge end of the second die facing the second back roller, the second die being used to coat the second surface; a heating structure, at least one of the first backing roller, the intermediate roller, and the second backing roller being provided with the heating structure, the heating structure comprising a first fluid channel; A coating oven is provided, wherein the coating oven is arranged downstream of the heating structure in the direction of the metal substrate, and the coated metal substrate is used to pass through the coating oven; the coating oven is provided with a second fluid channel, wherein the first fluid channel and the second fluid channel are respectively used to receive a heating fluid, and the first fluid channel is connected to the second fluid channel.

2. The coating device according to claim 1, wherein The coating oven includes a first oven and a second oven, wherein the first oven is disposed between the first backing roller and the intermediate roller in the running direction of the metal substrate, and the second backing roller is disposed between the intermediate roller and the second oven in the running direction of the metal substrate; The first backing roller is provided with the heating structure, and at least one of the intermediate roller and the second backing roller is provided with the heating structure.

3. The coating device according to claim 1 or 2, characterized in that The first fluid channel is spirally arranged along a direction surrounding the axis of the roller.

4. The coating device according to claim 1 or 2, characterized in that The first fluid channel includes at least one bent segment.

5. The coating device according to claim 1 or 2, characterized in that The first fluid channel includes at least two sub-channel segments, and the sub-channel segments are arranged side by side along the circumferential direction or the axial direction of the roller.

6. The coating device according to claim 1 or 2, characterized in that The coating device further includes a first temperature detecting device and a regulating device, wherein the first temperature detecting device faces the metal substrate and is used to detect the temperature of the metal substrate after being heated by the heating structure; The signal input end of the regulating device is connected to the first temperature detecting device, the regulating device is connected to the heating structure, and the regulating device is used to regulate the heating power of the heating structure according to the detected temperature of the metal substrate.

7. The coating device according to claim 6, wherein The coating equipment also includes a second temperature detection device, which is provided on the roller having the heating structure; the signal input end of the adjustment device is also connected to the second temperature detection device, and the adjustment device is used to adjust the heating power of the heating structure according to the detection temperature of the roller, the detection temperature of the metal substrate and the target temperature of the metal substrate.

8. The coating device according to claim 6, wherein The regulating device includes a flow valve; a signal input end of the flow valve is connected to the first temperature detection device, and the flow valve is used to regulate the flow of the heating fluid in the first fluid channel according to the detected temperature of the metal substrate.

9. The coating device according to claim 1 or 2, characterized in that The coating device further comprises a cooling structure, and the roller having the heating structure is provided with the cooling structure.

10. A battery production line, characterized in that: The battery production line includes the coating apparatus according to any one of claims 1 to 9.

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