Pole piece coating device
By independently heating the material tank and coating roller in the electrode sheet coating device, and combining the design of the loading baffle and stirring unit, the problem of slurry temperature inconsistency is solved, and the production stability and yield of the electrode sheet are improved. Suitable for different slurry types.
Patent Information
- Application Number
- CN202420799963.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The long exposure time of the slurry in the transfer coating equipment leads to inconsistent thickness and poor stability of the electrode sheet production, affecting the performance of lithium-ion batteries. The existing heating scheme cannot effectively overcome the internal temperature difference of the slurry, limiting the stability and finished products of the electrode sheet production. Rate.
Design an electrode sheet coating device, by setting an independent heating device in the material groove and the coating roller, and heating is carried out separately according to the distance and position between the material groove and the coating roller, and combining with the adjustable loading baffle The distance and stirring unit accurately control the slurry temperature to ensure the temperature consistency of the slurry on the coating roller side.
It significantly improves the surface density consistency and production stability of the electrode sheet, and is suitable for slurries of different viscosity and thermal conductivity, enhances the applicability and production flexibility of the equipment, and improves the yield rate.
Smart Images
Figure CN222287720U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pole piece coating, and specifically relates to a pole piece coating device. Background Art
[0002] As an important component of lithium-ion batteries, the uniformity and consistency of active material coating directly affects the performance of lithium-ion batteries. Currently, the pole pieces of lithium-ion batteries are mainly produced by transfer and extrusion. Among them, the extrusion method mainly uses slit extrusion coating, which has the advantages of fast coating speed, high precision and uniform thickness. In addition, the slurry is exposed to the outside for a short time during the coating process, and the coating uniformity is less affected by the uneven slurry temperature. However, the equipment cost of this method is relatively high. Compared with slit extrusion coating, transfer coating equipment has the advantage of low equipment cost, but the slurry is exposed to the transfer coating equipment for a long time. On the one hand, there is a risk of contamination. On the other hand, the consistency of the pole piece is greatly affected by the slurry temperature. It is impossible to ensure the continuous production of pole pieces with high thickness consistency and stability, which directly affects the performance of lithium-ion batteries. This is also the main reason why transfer coating equipment cannot be widely used in large-scale production of pole pieces.
[0003] In this regard, existing patents heat the coating die and the slurry delivery pipeline to ensure that the slurry is coated from the coating die to the collector surface in a fully heated state, but this solution is not applicable to transfer coaters; for transfer coaters, there are reports claiming that heating the coating roller can increase the temperature of the slurry, thereby improving the coating effect.
[0004] The above solution can ensure that the slurry maintains stable fluidity and forms a slurry layer with basically uniform weight on the surface of the current collector. However, in fact, the inconsistent surface density and uneven coating caused by the temperature difference inside the slurry are the fundamental reasons that limit the production stability and yield of the electrode, and conventional insulation methods cannot effectively overcome the temperature difference inside the slurry.
[0005] In view of this, the present utility model is proposed. Utility Model Content
[0006] The technical problem to be solved by the utility model is to solve one of the problems in the above-mentioned prior art and to provide a pole piece coating device. By improving the structure of the material trough of the coating device, the temperature consistency of the slurry in the material trough, especially the slurry on the side close to the coating roller, is improved, so that the stability and consistency of pole piece production are greatly improved, and the yield of the coating device is improved.
[0007] In order to solve the above technical problems, the utility model provides a pole piece coating device, comprising:
[0008] Trough;
[0009] A coating roller is partially immersed in the material tank and is rotatably arranged relative to the material tank;
[0010] The invention is characterized in that it also includes a heating device which is arranged in the material trough and the coating roller to heat the material trough and the coating roller, and the heating devices in the material trough and the coating roller operate independently of each other.
[0011] In the above scheme, the material trough and the coating roller are heated separately by the heating device. On the one hand, the heating of the material trough ensures that the slurry temperature is uniform; on the other hand, the heating of the coating roller can avoid the internal temperature difference during the slurry transportation process; and the temperatures of the material trough and the coating roller are controlled independently of each other. The internal temperature gradient of the slurry can be controlled by adjusting the temperature of the material trough and the coating roller, thereby better ensuring the temperature consistency of the slurry close to one side of the coating roller and the slurry attached to the surface of the coating roller in the radial direction of the coating roller, thereby improving the stability of the electrode.
[0012] Furthermore, the temperature at different positions of the trough is positively correlated with the distance between the trough wall and the coating roller.
[0013] The temperature of the slurry on the side close to the coating roller is related to the distance between the material trough and the coating roller. The greater the distance, the lower the temperature of the slurry at the same heating temperature, thereby forming a low-temperature zone in the slurry, which in turn affects the temperature consistency of the slurry on the side close to the coating roller. The above scheme not only heats the material trough and the coating roller, but also controls the temperature at different positions of the material trough separately. It can control the temperature according to the distance between the material trough and the coating roller, further reducing the temperature difference of the slurry on the side close to the coating roller along the radial direction of the coating roller.
[0014] Furthermore, the material trough is divided into several temperature zones according to the distance between the trough wall and the coating roller, and several heating devices are respectively arranged in each temperature zone, and the temperature of each temperature zone is adjusted independently of each other.
[0015] The above-mentioned setting method improves the flexibility of the temperature control of the material tank, can more accurately adjust one or several temperature zones in the material tank according to the actual temperature requirements, and simplifies the temperature control operation to a certain extent.
[0016] Further, the trough comprises,
[0017] A feeding baffle is arranged in the material trough opposite to the coating roller and is movably connected to the material trough;
[0018] The distance between the feeding baffle and the coating roller surface is adjustable.
[0019] In the above scheme, increasing or decreasing the distance between the loading baffle and the coating roller is essentially an adjustment of the heat transfer distance between the loading baffle and the coating roller. By reducing the heat transfer distance between the loading baffle and the coating roller, the temperature consistency of the slurry near the surface of the coating roller in the material trough is improved; the distance control between the loading baffle and the coating roller can also be combined with the temperature control of the loading baffle to further improve the control accuracy of the slurry temperature consistency; in this scheme, the movement of the loading baffle will not affect the capacity of the material trough, and therefore will not cause leakage of the slurry.
[0020] Or alternatively to the above solution, the trough includes,
[0021] A material loading baffle is formed as a groove wall on one side of the material groove opposite to the coating roller;
[0022] The distance between the feeding baffle and the coating roller surface is adjustable.
[0023] In the above alternative scheme, the loading baffle serves as one side wall of the trough. As the loading baffle moves, the capacity of the trough will inevitably change. In order to ensure the stability of electrode production, the loading baffle needs to be adjusted before starting coating.
[0024] Furthermore, the loading baffle is rotatably arranged relative to the material trough with a straight line parallel to the rotating axis of the coating roller as an axis.
[0025] Furthermore, the loading baffle is slidably arranged relative to the material trough.
[0026] In the above scheme, the loading baffle can be set to rotate or slide independently, or the two movement modes can be combined, which can slide and rotate, further expanding the adjustment flexibility of the loading baffle.
[0027] Furthermore, the electrode coating device further comprises a backing roller, which is arranged side by side with the coating roller, and a film transfer gap is formed between the two;
[0028] A heating device is provided in the backing roller, and the heating of the material trough, the coating roller and the backing roller is performed independently of each other.
[0029] As the slurry is transferred between the coating roller and the back roller, the current collector also passes through the membrane transfer gap between the coating roller and the back roller. The back roller can heat the current collector to prevent the slurry from transferring from the higher temperature coating roller to the lower temperature current collector surface, causing a temperature difference inside the slurry. This can more fully ensure the stability of the slurry temperature during the membrane transfer process; it can also compensate to a certain extent when there is a temperature difference inside the slurry.
[0030] Furthermore, the electrode coating device also includes:
[0031] The stirring unit extends into the material tank and is used to stir the slurry in the material tank. By setting the stirring unit to stir the slurry in the material tank, the relative flow between the slurries is promoted, which is beneficial to the temperature conduction inside the slurry and can better improve the temperature consistency of the slurry.
[0032] Furthermore, the electrode coating device also includes:
[0033] A control unit is connected to the heating device for sending instructions to the heating device according to the difference between the actual temperature parameter in the trough and the preset parameter, so as to control the working parameters of the heating device;
[0034] The temperature detection unit extends into the trough and is used to obtain actual temperature parameters at different depths along the depth direction of the trough and send them to the control unit.
[0035] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.
[0036] 1. The control method for the slurry temperature in the material tank is flexible. The temperature consistency of the slurry in the material tank can be maintained by adjusting the temperature of the material tank, controlling the distance between the feeding baffle and the coating roller, or a combination of the two. The temperature difference of the slurry attached to the surface of the coating roller along the thickness direction of the coating roller is greatly reduced, and the surface density consistency of the obtained electrode is improved; and compared with a material tank with a fixed capacity and structure, the solution of the utility model can make targeted adjustments for slurries with different viscosities and thermal conductivities, as well as different slurry liquid level requirements, and has a wider applicability and can meet different production needs.
[0037] 2. The distance between the loading baffle and the coating roller can be controlled by rotating, sliding, etc.; the rotating method has relatively low adjustment accuracy but a relatively simple structure, and combined with the control of the loading baffle and the coating roller temperature, the slurry temperature can be kept consistent; the sliding method has relatively higher adjustment accuracy, and the temperature control accuracy requirements for the loading baffle are lower. Even on the basis of ensuring that the loading baffle has a heating function, the consistency of the slurry temperature can be well guaranteed by sliding alone, which has a relatively low difficulty in regulation. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] Figure 1 It is a structural schematic diagram of the coating structure in the pole piece coating device of the utility model;
[0039] Figure 2 This is another structural schematic diagram of the coating structure in the pole piece coating device of the utility model;
[0040] Figure 3 yes Figure 1A schematic diagram of a first structure of a material tank and a coating roller in the coating structure shown;
[0041] Figure 4 yes Figure 3 A cross-sectional view of the trough and coating roller shown;
[0042] Figure 5 yes Figure 1 A second structural schematic diagram of the material tank and the coating roller in the coating structure shown;
[0043] Figure 6 yes Figure 1 A third structural schematic diagram of the material tank and the coating roller in the coating structure shown;
[0044] Figure 7 yes Figure 1 A fourth perspective schematic diagram of the coating structure of the material tank and the coating roller;
[0045] Figure 8 yes Figure 1 A fifth perspective schematic diagram of the coating structure of the material tank and the coating roller;
[0046] Fig. 9 yes Figure 1 A sixth structural schematic diagram of the material trough and the coating roller in the coating structure shown;
[0047] Fig.10 yes Figure 1 A seventh structural schematic diagram of a material tank and a coating roller in the coating structure shown;
[0048] Fig.11 yes Figure 1 An eighth perspective schematic diagram of the coating structure of the material tank and the coating roller;
[0049] Fig.12 yes Fig.11 The schematic diagram of the structure after the enlargement of A in the middle;
[0050] Fig.13 yes Figure 1 A ninth perspective schematic diagram of the coating structure of the material tank and the coating roller;
[0051] Fig.14 yes Figure 2 A schematic diagram of a first structure of a material tank and a coating roller in the coating structure shown;
[0052] Fig.15 yes Figure 2 A second structural schematic diagram of the material tank and the coating roller in the coating structure shown;
[0053] Fig.16This is a schematic diagram of the first structure of the feeding baffle in the pole piece coating device of the utility model;
[0054] Fig.17 This is a second structural schematic diagram of the feeding baffle in the pole piece coating device of the utility model;
[0055] Fig.18 It is a connection diagram of the temperature detection unit, the control unit and the heating device in the electrode coating device of the utility model;
[0056] Fig.19 It is a connection diagram of the temperature detection unit, the control unit and the motor in the pole piece coating device of the utility model.
[0057] In the figure: 1. material trough; 2. coating roller; 3. feeding baffle; 4. limiting unit; 5. rotating shaft of feeding baffle; 6. slide rail; 7. linear motor; 8. fixed claw; 9. medium circulation unit; 10. back roller. DETAILED DESCRIPTION
[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.
[0059] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0061] In the description of the present utility model, unless otherwise specified, the term "A and / or B" is generally understood, and its meaning includes three situations: only A, only B, and the existence of A and B at the same time.
[0062] Unless otherwise specified, the adjustable distance between the loading baffle and the coating roller mentioned in the description of the present invention actually refers to the adjustable distance between the loading baffle as the side wall of the trough and the coating roller surface as the side wall of the trough.
[0063] The utility model provides a pole piece coating device, which adopts a transfer coating method. Its coating structure includes a material tank 1, a coating roller 2 and a back roller 10, and a film transfer gap is formed between the coating roller 2 and the back roller 10. The working principle of the pole piece coating device is as follows: the coating roller 2 rotates to bring out the slurry in the material tank 1, and the thickness of the slurry layer brought out by the coating roller 2 is controlled by a comma roller or a scraper to achieve the metering of the slurry coating amount on the pole piece surface, and then the slurry attached to the coating roller 2 at the film transfer gap is transferred to the collector on the surface of the back roller 10, and the pole piece is formed through subsequent drying and cutting; the utility model can ensure that the slurry in the material tank 1, especially the slurry on the side close to the surface of the coating roller 2, has higher temperature consistency by independently heating the coating roller 2 and the material tank 1, so as to avoid the slurry attached to the coating roller 2 from having obvious temperature difference along the radial direction of the coating roller 2, thereby improving the stability of pole piece production and the consistency of surface density.
[0064] Next, combine with Figures 1 to 19 , the utility model is further described in detail with specific embodiments.
[0065] Embodiment 1
[0066] As an embodiment of the present utility model, this embodiment provides a pole piece coating device, such as Figure 1 As shown, the coating roller 2 is formed as a side wall of the material trough 1, so that the coating roller 2 contacts the slurry on the side facing the material trough 1, and a first heating device is provided in the coating roller 2, and a second heating device is correspondingly provided in the material trough 1. The first heating device and the second heating device are independently controlled from each other, and the temperatures of the coating roller 2 and the material trough 1 are respectively adjusted by the first heating device and the second heating device to ensure that the temperature of the slurry on the side close to the surface of the coating roller 2 remains consistent.
[0067] In the above scheme, the first heating device and the second heating device can be independently set as a medium heating device or an electric heating device. When the first heating device and the second heating device are set as medium heating devices, the heating medium can be a gaseous medium or a liquid medium. In order to ensure the uniformity and consistency of the temperature of the coating roller 2, the first heating device is preferably an electric heating device. The consistency of the slurry temperature in the material tank 1 is achieved by the cooperation of the first heating device and the second heating device. However, in actual operation, the temperature of the first heating device used to heat the coating roller 2 is usually kept fixed, and the control of the slurry temperature is mainly achieved by the second heating device. Therefore, in this embodiment, the second heating device is introduced in detail, and the second heating device is taken as an example of a medium heating device.
[0068] Specifically, the second heating device includes a heating unit and a medium circulation unit 9, which are connected in series, wherein the medium circulation unit 9 is independently arranged on one side of the material trough 1; in order to save production costs and improve temperature control stability, the second heating device is usually arranged on the side of the material trough 1 opposite to the coating roller 2, and the shape of the medium circulation unit 9 can be selected and designed according to actual usage requirements.
[0069] Fig.12 A conventional setting method is shown. The figure shows a loading baffle 3 arranged opposite to the coating roller 2 in the material trough 1, and the medium circulation unit 9 is arranged on one side of the loading baffle 3 in a serpentine tube shape. When this scheme is adopted, the medium circulation unit 9 is detachably arranged relative to the loading baffle 3, and the setting method of the medium circulation unit 9 can be targetedly adjusted according to actual use needs, thereby improving the flexibility of use. Regardless of the form of the medium circulation unit 9, in order to avoid affecting the stability of the slurry, the medium circulation unit 9 is usually preferably arranged on the side away from the inside of the material trough 1.
[0070] Alternatively, as an alternative to the above-mentioned solution, a serpentine hollow path is formed in the loading baffle 3, and both ends of the serpentine hollow path are respectively connected to the heating units, that is, the loading baffle 3 is both a part of the material trough 1 and a part of the heating device; compared with the independently arranged medium circulation unit 9, it has higher heat transfer efficiency and a more stable medium circulation path, but it cannot be disassembled and can only be replaced together with the loading baffle 3 or the material trough 1.
[0071] In addition, the medium circulation unit 9 may also be provided with a circulation cavity that matches the shape and size of the loading baffle 3 , or a circulation cavity may be formed hollow inside the loading baffle 3 , which can also achieve heating of the material tank 1 .
[0072] Since the surface of the coating roller 2 is an arc surface, the distance between the material trough 1 and the coating roller 2 is not consistent. By controlling the temperature of the first heating device and the second heating device, the temperature of the slurry on the side close to the surface of the coating roller 2 in the slurry will inevitably change with the distance between the coating roller 2 and the material trough 1; for this reason, the material trough 1 is divided into several temperature zones, and the distances between each temperature zone and the coating roller 2 are the same or different. By independently controlling the temperature of each temperature zone, the temperature of each temperature zone can be adjusted specifically according to the change of the distance between the coating roller 2 and the material trough 1, thereby further improving the temperature consistency of the slurry on the side close to the coating roller 2; the division of temperature zones is related to the distribution of the second heating device in the material trough 1. When the second heating device is only arranged on the loading baffle 3, the corresponding temperature zone is only divided into temperature zones on the loading baffle 3.
[0073] The division method of the temperature zones in the material trough 1 can be specifically set according to actual use requirements, and can also be set according to the shape of the material trough 1 or the change in the distance between the material trough 1 and the coating roller 2; taking the temperature zones being set according to the change in the distance between the material trough 1 and the coating roller 2 as an example, the positions in the material trough 1 that are at the same distance from the coating roller 2 are divided into the same temperature zone, and the positions at different distances are divided into different temperature zones; the material trough 1 can also be divided into several temperature zones in sequence along the rotation direction of the coating roller 2.
[0074] In order to realize independent control of the temperature of each temperature zone, the second heating device includes a plurality of sub-heating devices that are independently controlled from each other, and each sub-heating device is respectively arranged in each temperature zone of the trough 1, thereby realizing independent control of the temperature of each temperature zone through the sub-heating device; in order to meet the temperature regulation requirements of different temperature zones, the number and arrangement density of the sub-heating devices in each temperature zone can be designed according to actual use requirements; Fig.16 , 17 Taking the medium circulation unit 9 in the form of a serpentine tube as an example, the serpentine tube can be divided into several unconnected sections according to the division of temperature zones, and the temperature of each section of the tube is independently controlled, thereby realizing independent adjustment of the temperature in each temperature zone.
[0075] Further, such as Figure 1 As shown, the electrode coating device also includes a back roller 10, and a third heating device is correspondingly provided in the back roller 10. The back roller 10 is heated by the third heating device. As the temperature of the back roller 10 increases, the temperature of the collector also increases accordingly, thereby reducing or even eliminating the temperature difference during the slurry transfer process, so that the slurry is transferred in a uniform state, further improving the surface density consistency of the obtained electrode.
[0076] The current collector and the slurry attached to the surface of the current collector enter the drying device at a higher temperature, which shortens the duration of the subsequent drying process. The solvent can float up and evaporate at a faster rate, avoiding the floating of the binder with the evaporation of the solvent, thereby improving the yield of the electrode.
[0077] It should be noted that the electrode coating device in this embodiment can also be configured as follows: Figure 2 From the structure shown, it can be seen that Figure 2 In the structure shown, the coating roller 2 is arranged independently of the material tank 1 and partially sunk into the material tank 1, so that the surface of the coating roller 2 facing the inside of the material tank 1 is immersed in the slurry.
[0078] Embodiment 2
[0079] As another embodiment of the utility model, this embodiment further makes the following improvements on the basis of the first embodiment. In order to further improve the consistency of the slurry temperature near the surface of the coating roller 2, the distance between the material tank 1 and the coating roller 2 is adjustable.
[0080] In this embodiment, the material trough 1 includes a loading baffle 3 arranged opposite to the coating roller 2, and the loading baffle 3 is movably arranged relative to the material trough 1. The first heating device is at least arranged on the loading baffle 3, and then the temperature of the slurry on the side close to the coating roller 2 can be adjusted by adjusting the distance between the loading baffle 3 and the coating roller 2, thereby effectively reducing the temperature difference in the slurry; and the existence of the loading baffle 3 will not affect the sealing of the material trough 1, and the problem of slurry leakage will not occur due to the adjustment of the loading baffle 3.
[0081] The loading baffle 3 can be movably connected with the material trough 1 by means of rotation, sliding, etc. When the sliding method is adopted, the loading baffle 3 as a whole realizes the adjustment of the distance between the loading baffle 3 and the coating roller 2 in a translational manner, that is, the distance between the loading baffle 3 and the coating roller 2 at different positions changes at the same speed. At this time, the temperature of the slurry close to the coating roller 2 can be adjusted without additionally adjusting the first heating device and the second heating device; the sliding of the loading baffle 3 can be achieved by conventional methods such as slide rails 6 and linear motors 7.
[0082] like Figures 3 to 4 , 7 to 8 and Fig.14 As shown, when the rotation mode is adopted, the rotating shaft 5 of the loading baffle is parallel to the rotating shaft of the coating roller 2. During the rotation of the loading baffle 3, the distance between the loading baffle 3 and the surface of the coating roller 2 changes with the angle between the loading baffle 3 and the coating roller 2, thereby realizing the control of the slurry temperature close to the coating roller 2; small temperature differences can be adjusted by rotating the loading baffle 3; or in order to maximize the rotation range of the loading baffle 3, the rotating shaft 5 of the loading baffle is located in the middle of the material trough 1.
[0083] Furthermore, the position of the rotating shaft on the loading baffle 3 also has a significant impact on the adjustment effect; Figure 3 , 4 As shown in , 7, when the rotating shaft is at one side edge of the loading baffle 3, the rotation amplitude of the loading baffle 3 increases synchronously with the increase of the distance from the rotating shaft; correspondingly, as Figure 8 When the rotating shaft is located in the middle of the loading baffle 3, the problem of a large adjustment range at one end and a small adjustment range at the other end is avoided to a certain extent, but the overall rotation range of the loading baffle 3 is correspondingly reduced, and the adjustment capacity is limited.
[0084] When rotating, there will inevitably be a difference in the degree of displacement of the loading baffle 3 on the side close to the rotating shaft and the side away from the rotating shaft, so that rotation alone cannot fully meet the adjustment requirements of the slurry temperature consistency. For this reason, the temperature consistency of the slurry close to the coating roller 2 can be controlled by rotating the loading baffle 3 and controlling the temperature of the first heating device.
[0085] like Figures 9 to 12 as well as Fig.15 As shown, when the sliding mode is adopted, the loading baffle 3 moves in a translational manner, and the angle between the loading baffle 3 and the coating roller 2 remains unchanged, thereby ensuring the consistency of regulation of different temperature zones.
[0086] Fig.11 , 12 As shown, the loading baffle 3 slides by means of a slide rail 6, and the slide rail 6 is arranged on the two side trough walls adjacent to the loading baffle 3 in the material trough 1. The slide rail 6 can be arranged at the bottom of the material trough 1 as shown in the figure, or it can be arranged in the middle or top of the material trough 1 according to actual use requirements, or multiple groups of slide rails 6 can be arranged at the bottom, middle and top respectively to further improve the sliding stability of the loading baffle 3.
[0087] Or Fig. 9 , 10 As shown in Figures 15, the loading baffle 3 is driven to move by the linear motor 7, which has higher reliability than sliding through the slide rail 6. In order to make the loading baffle 3 more evenly stressed, the end of the motor shaft of the linear motor 7 has a plurality of fixed claws 8 extending in different directions, and the ends of the fixed claws 8 are respectively connected to different positions of the side of the loading baffle 3 away from the material trough 1. The number of fixed claws 8 can be adjusted according to actual needs, which further improves the sliding reliability of the loading baffle 3 and can better prevent the loading baffle 3 from being blocked and deformed and twisted.
[0088] The shape of the feeding baffle 3 is as follows: Fig. 9 and Fig.10 As shown, it can be set as a flat plate or a curved plate according to actual needs, or it can be set as Fig.16 and Fig.17 As shown, it is selected to be hollowed out or not hollowed out. When the loading baffle 3 is set to a hollow plate, the movement of the loading baffle 3 will not affect the change of the slurry level in the trough 1, and the impact on the level change can be further reduced by reducing the movement amplitude.
[0089] Embodiment 3
[0090] As another embodiment of the utility model, this embodiment differs from the second embodiment in that the structure of the material trough 1 is different. In this embodiment, the loading baffle 3 is formed as a side trough wall of the material trough 1 opposite to the coating roller 2. The capacity of the material trough 1 changes synchronously with the movement of the loading baffle 3. At this time, the loading baffle 3 cannot be set as a hollow plate.
[0091] The method of adjusting the distance between the loading baffle 3 and the coating roller 2 and the setting method of the heating device in the loading baffle 3 and the coating roller 2 are the same as those in Example 2. The loading baffle 3 can also adjust the distance between it and the coating roller 2 by rotating or sliding. Compared with Example 2, the loading baffle 3 in this embodiment has slurry only on one side, which has higher heating efficiency for the slurry and lower slurry temperature control cost. However, since the change in the distance between the loading baffle 3 and the coating roller 2 directly affects the capacity of the material tank 1, and thus causes a change in the slurry liquid level, it may lead to a decrease in the consistency of the electrode. Therefore, when the loading baffle 3 serves as a side wall of the material tank 1, the coating machine needs to be controlled to pause during the movement of the loading baffle 3 and continue working after the adjustment is completed.
[0092] Specifically, the feeding baffle 3 is used as follows Figure 5 , 6 When the material trough 1 shown in the figure is used as a side trough wall of the material trough 1, it can be set to be aligned with the end of the adjacent trough wall to ensure that the material trough 1 has a relatively larger volume; and the end of the loading baffle 3 that abuts against the coating roller 2 will not cause slurry leakage due to displacement, thereby ensuring the stability and sealing of the material trough 1; it can also be set to have a spacing between the end of the adjacent trough wall away from the coating roller 2. Although this affects the capacity of the material trough 1 to a certain extent, it has higher reliability.
[0093] In order to prevent the loading baffle 3 from excessively rotating away from the coating roller 2, a limiting unit 4 for limiting the rotation range of the loading baffle 3 is provided on the adjacent groove wall. The limiting unit 4 limits the rotation of the loading baffle 3 in the area between the limiting unit 4 and the coating roller 2, thereby avoiding leakage of slurry to a certain extent.
[0094] In the material trough 1 of this structure, the loading baffle 3 is subjected to gravity and / or pressure from the slurry, and inevitably produces a rotation tendency. If this tendency is not intervened, the distance between the loading baffle 3 and the coating roller 2 cannot be effectively controlled, which is not conducive to the control of the temperature consistency of the slurry near the surface of the coating roller 2. For this reason, a locking unit is also provided on the two side baffles or the loading baffle 3, and the loading baffle 3 is stopped by the locking unit.
[0095] Specifically, as a specific implementation of this embodiment, the locking unit is a plurality of raised structures arranged on the two side baffles, and the raised structures slightly protrude from the fitting surface between the side baffles and the loading baffle 3, so as to increase the rotational resistance when the loading baffle 3 rotates and passes through the raised structures, thereby realizing the parking of the loading baffle 3; a plurality of raised structures can be arranged at intervals along the sweeping path of the loading baffle 3 on the surface of the side baffle, and the distance between two adjacent raised structures on the sweeping path of the loading baffle 3 is equal to or slightly greater than the thickness of the loading baffle 3, which can realize the parking of the loading baffle 3 more stably.
[0096] As another specific implementation of this embodiment, the protruding structure is arranged on the side baffle or the loading baffle 3, and can be retracted in a direction perpendicular to the fitting surface of the side baffle and the loading baffle 3. By the extension and retraction of the protruding structure, the friction between the loading baffle 3 and the side baffle is increased or decreased, thereby realizing the parking and unlocking of the loading baffle 3.
[0097] As another specific implementation of this embodiment, the material trough 1 also includes a motor, which is driven and connected to the loading baffle 3 through the rotating shaft 5 of the loading baffle. This solution does not require the operator to manually control the rotation of the loading baffle 3, and has higher accuracy and stability.
[0098] Or Fig.13 As shown, the loading baffle 3 serves as a side wall of the material trough 1 and moves directly by sliding. However, this method has the problem of difficulty in sealing. If the sliding gap is small, the loading baffle 3 will not slide smoothly, which will reduce the user experience. If the sliding gap is large, the slurry will easily leak. In order to further improve the sealing performance of the material trough 1, sealing units are further provided on both sides where the loading baffle 3 and the side baffle are fitted. The sealing unit increases the friction between the side baffle and the loading baffle 3 while improving the sealing performance of the material trough 1, so that the loading baffle 3 can stay more stably after the adjustment is completed, which is beneficial to improving the consistency of the slurry temperature close to the coating roller 2.
[0099] Embodiment 4
[0100] As another embodiment of the present utility model, this embodiment further makes the following improvements on the basis of the first embodiment.
[0101] In this embodiment, the electrode coating device also includes a stirring unit, which extends into the material tank 1. The slurry is stirred by the stirring unit while being heated by the material tank 1 and the coating roller 2, so that the temperature consistency is higher. Stirring is used to increase the speed of temperature transfer. The first heating device and the second heating device do not need to be adjusted separately. The control logic of the heating device is simplified by combining heating and stirring.
[0102] The stirring unit can be configured as a stirring paddle extending into the material tank 1, or can be configured as an ultrasonic vibrating rod that can play a similar stirring role; in this embodiment, a stirring paddle is taken as an example for further detailed description.
[0103] In order to achieve stirring of the slurry, the rotation axis of the stirring paddle is usually set in the vertical direction during actual use, but this cannot well ensure the temperature consistency of the slurry at different depths in the material tank 1. Therefore, the rotation axis of the stirring paddle can be adjusted to be parallel to the horizontal direction to promote the circulation between the slurries at different depths in the material tank 1. In addition, in order to avoid the generation of bubbles, the rotation speed of the stirring paddle should not be too fast when the rotation axis is parallel to the horizontal direction.
[0104] It should be noted that the solution of setting up a stirring unit described in this embodiment can also be used in the solutions described in Embodiment 2 and Embodiment 3. The new technical solutions obtained by combining this embodiment with Embodiment 2 and Embodiment 3 also fall within the protection scope of the present utility model.
[0105] Embodiment 5
[0106] As another embodiment of the present utility model, this embodiment further makes the following improvements on the basis of the first embodiment.
[0107] In this embodiment, if Fig.18 As shown, the electrode coating device also includes a control unit, and a temperature detection unit that is communicatively connected to the control unit for detecting the temperature in the material tank 1. The temperature detection unit sends the detected temperature in the material tank 1 to the control unit. The control unit matches the target temperature parameters of the first heating device and the second heating device according to the temperature in the material tank 1, and adjusts the first heating device and the second heating device respectively according to the target temperature parameters to ensure that the slurry attached to the surface of the coating roller 2 and the slurry coating formed on the surface of the current collector have high temperature consistency.
[0108] The control unit can provide the target temperature parameters to the operator, who can adjust them manually, or can directly communicate with the first heating device and the second heating device to directly control the temperatures of the first heating device and the second heating device.
[0109] Specifically, the temperature detection unit is arranged on the side of the material tank 1 close to the coating roller 2 to detect the temperature of the slurry in the material tank 1 close to the surface of the coating roller 2 as the actual temperature parameter fed back to the control unit. If the actual temperature parameter is close to or consistent with the temperature of the first heating device, it is considered that the temperature consistency of the slurry attached to the surface of the coating roller 2 is high; if the actual temperature parameter is significantly different from the temperature of the first heating device, the control unit selectively controls the temperature of the first heating device and the second heating device according to the actual difference. The adjustment of the first heating device and the second heating device can be determined according to the measured actual temperature parameter. It should be noted that if the temperature difference between the actual temperature parameter and the first heating device is within a preset first threshold, there is no need to adjust the temperature of the first heating device and / or the second heating device; in this embodiment, the first threshold is 1°C, that is, the difference between the temperature of the first heating device and the actual temperature parameter is less than 1°C, and it is judged that no adjustment is required.
[0110] Furthermore, in order to improve the accuracy of the actual temperature parameters, temperature detection units are respectively set at different depths in the material trough 1. The number of temperature detection units can be adjusted according to actual detection requirements. In theory, the more temperature detection units there are, the more accurate the corresponding actual temperature parameters will be. For ease of understanding, this embodiment only takes the first temperature detection unit and the second temperature detection unit set at different depths as an example for illustration.
[0111] The control method of the coating device in this embodiment includes the following steps:
[0112] S1, obtaining the actual temperature parameters of the slurry in the tank 1;
[0113] S2, judging that the temperature of the slurry along the radial direction of the coating roller 2 is inconsistent according to the actual temperature parameter, and matching the target temperature parameters of the feeding baffle 3 and the coating roller 2 according to the temperature difference between the actual temperature parameter and the coating roller 2;
[0114] S3. Adjust the temperature of the material tank 1 and / or the coating roller 2 according to the target temperature parameter.
[0115] The specific process is as follows:
[0116] The first temperature detection unit and the second temperature detection unit are respectively located at different depths of the material tank 1 and are arranged close to the surface of the coating roller 2. The first temperature detection unit and the second temperature detection unit respectively independently obtain the first temperature parameter and the second temperature parameter and send them to the control unit. The control unit calculates the average value of the first temperature parameter and the second temperature parameter as the actual temperature parameter; then the control unit compares the actual temperature parameter with the temperature of the first heating device. If the temperature difference between the two is less than 1°C, it is judged that the temperature consistency of the slurry on the side close to the coating roller 2 is high and no temperature control is required; if the temperature difference between the two is greater than 1°C, it is judged that the temperature consistency of the slurry is low and it is necessary to adjust the temperature of the second heating device, match the corresponding target temperature parameter and send it to the second heating device, and the second heating device is adjusted according to the target temperature parameter; wherein the matching method of the target temperature parameter is: taking the temperature difference between the actual temperature parameter and the second heating device as the initial condition, bringing it into the pre-established coating machine model, simulating the temperature distribution of the slurry at different temperatures of the first heating device, and then obtaining the target temperature of the first heating device to maintain the uniform temperature of the slurry, and then matching the corresponding target heating parameter of the first heating device according to the target temperature, and the control unit adjusts the temperature of the material tank 1 and / or the coating roller 2 according to the target heating parameter.
[0117] In the above scheme, the target heating parameters include heating power and heating cycle, and the temperature of the first heating device can be directly controlled by the heating power; considering that the number of sub-heating devices located in different temperature zones of the loading baffle 3 is different, the temperature control of different temperature zones of the loading baffle 3 can also be achieved by adjusting the heating cycle of the sub-heating devices in the same temperature zone or different temperature zones; the control of the heating cycle includes but is not limited to the working time of each sub-heating device, the change of the heating power of each sub-heating device, and whether each sub-heating device is working.
[0118] It should be noted here that there are many methods for obtaining target temperature parameters through actual temperature parameters. In this embodiment, only one of them is used as an example for schematic illustration. Based on the familiarity with the technical principles of the present invention, technical personnel in this field only make conventional replacements in the method for obtaining the target parameters and obtain a technical solution that also falls within the protection scope of the present invention.
[0119] However, this solution may result in a situation where the difference between the first temperature parameter and the second temperature parameter is too large, but the average value is close to the temperature of the first heating device. Therefore, when judging that the temperature of the second heating device needs to be adjusted based on the actual temperature parameter, it is also necessary to calculate the difference between the first temperature parameter and the second temperature parameter and the average value, which are defined as the first difference and the second difference respectively. If the first difference and the second difference are close, then when the temperature needs to be adjusted, the temperature of the first heating device and / or the second heating device is adjusted as a whole; if the first difference and the second difference differ greatly, then when the temperature needs to be adjusted, the temperature adjustment amplitude of each sub-heating device is adjusted accordingly according to the size of the difference, or only the temperature of the temperature zone corresponding to the temperature detection unit with a larger difference is adjusted; correspondingly, when simulating using the model, it is also necessary to use the difference between each temperature parameter and the actual temperature parameter to correct the matching target temperature parameter, and adjust the sub-heating devices located in each temperature zone in the second heating device according to the corrected target temperature parameter.
[0120] Furthermore, when the diameters of the coating roller 2 and the back roller 10 are the same or basically the same, the temperatures of the first heating device and the third heating device are usually kept consistent; when the diameters of the coating roller 2 and the back roller 10 are inconsistent, in order to ensure the smooth transfer of the slurry, a speed difference between the coating roller 2 and the back roller 10 is inevitable; since the contact time between the back roller 10 and the current collector is affected by the change in speed, in order to ensure the stability of the temperature of the current collector, the temperatures of the first heating device and the third heating device can be adjusted within a certain range; when the speed of the back roller 10 is higher than that of the coating roller 2, the temperature of the back roller 10 can be appropriately increased to enhance the heating effect on the current collector; when the speed of the back roller 10 is lower than that of the coating roller 2, the temperature of the back roller 10 can also be appropriately reduced to avoid excessive heating of the current collector.
[0121] Embodiment 6
[0122] As another embodiment of the utility model, this embodiment provides a pole piece coating device as described in the second embodiment, and the pole piece coating device also includes a temperature detection unit and a control unit as described in the fifth embodiment. Fig.19 As shown, the difference is that in this embodiment, the control unit is connected to the motor for controlling the movement of the loading baffle plate, and the distance between the coating roller 2 and the loading baffle plate 3 is adjusted according to the actual temperature parameters.
[0123] When the feeding baffle 3 is a solid plate, the adjustment of the spacing will cause the change of the slurry liquid level. If the distance between the feeding baffle 3 and the coating roller 2 is adjusted during the coating process, it may affect the consistency of the electrode. Therefore, it is necessary to start coating after adjusting the distance between the coating roller 2 and the feeding baffle 3. If the distance between the coating roller 2 and the feeding baffle 3 needs to be adjusted during the coating process, the coating also needs to be suspended, and the coating is continued after the adjustment is completed. At this time, the control method of the spacing adjustment includes the following steps:
[0124] S1, obtaining the actual temperature parameters of the slurry in the tank 1;
[0125] S2, judging that the temperature of the slurry along the radial direction of the coating roller 2 is inconsistent according to the actual temperature parameter, and matching the spacing adjustment parameter between the feeding baffle 3 and the coating roller 2 according to the temperature difference between the actual temperature parameter and the coating roller 2;
[0126] S3. After adjusting the spacing parameters, coating is started.
[0127] Specifically, the control unit calculates the average value of the first temperature parameter and the second temperature parameter, which is defined as the actual temperature parameter, and confirms whether it is necessary to adjust the distance between the loading baffle 3 and the coating roller 2 according to the temperature difference between the actual temperature parameter and the first heating device. If the temperature difference is less than 1°C, it is judged that no adjustment is required; if the temperature difference is greater than or equal to 1°C, it is judged that adjustment is required. At this time, the corresponding spacing adjustment parameter is matched according to the actual temperature parameter and the temperature difference between the coating roller 2, and the control unit sends the spacing adjustment parameter to the operator, who manually adjusts it according to the spacing adjustment parameter; or the control unit controls the movement of the loading baffle 3 according to the spacing adjustment parameter to adjust the spacing between the loading baffle 3 and the coating roller 2.
[0128] It should be noted here that since the distance between the loading baffle 3 and the coating roller 2 is adjustable, in step S1, the first temperature parameter and the second temperature parameter are actually temperature parameters respectively obtained from positions close to one side of the coating roller in the area between the loading baffle 3 and the coating roller 2.
[0129] Among them, the matching method of the spacing adjustment parameters is: taking the actual temperature parameters, the temperatures of the first heating device and the second heating device as the initial conditions, bringing them into the pre-established coating machine model, simulating the temperature distribution state of the slurry at different distances between the loading baffle 3 and the coating roller 2, and then obtaining the distance between the loading baffle 3 and the coating roller 2 that maintains the uniform temperature of the slurry; then converting it into the target relative position between the loading baffle 3 and the adjacent groove wall; for adjusting the distance by rotating the loading baffle 3, the spacing adjustment parameters also include the target angle, that is, the angle between the cross section of the coating roller 2 parallel to the plane where the loading baffle 3 is located and the reference plane; the reference plane can be a horizontal plane, a vertical plane or other preset planes; the target angle can be used as a spacing adjustment parameter alone, or it can be used as a spacing adjustment parameter in conjunction with the target relative position.
[0130] Furthermore, when the loading baffle 3 is rotated to adjust the distance between the loading baffle 3 and the coating roller 2, the adjustment effect is limited. Therefore, while adjusting the distance between the loading baffle 3 and the coating roller 2 according to the actual temperature parameters, the temperature of the first heating device and the second heating device can also be combined to further improve the temperature consistency of the slurry close to the coating roller 2.
[0131] To this end, it is also necessary to calculate the differences between the first temperature parameter and the second temperature parameter and the actual temperature parameter, which are defined as the first difference and the second difference respectively. If the first difference and the second difference are relatively close, then only the distance between the loading baffle 3 and the coating roller 2 needs to be adjusted; if the first difference and the second difference are relatively large, then while adjusting the distance between the coating roller 2 and the loading baffle 3 according to the size of the first difference and the second difference, it is also necessary to adjust the temperature of the first heating device and the second heating device; when the temperature and distance are adjusted synchronously, the temperature control of each sub-heating device needs to correspond to the interval between the loading baffle 3 and the coating roller 2. On the whole, the farther the interval between the loading baffle 3 and the coating roller 2 is, the higher the temperature of the sub-heating device at the corresponding position is, and vice versa. In this embodiment, the adjustment method of the first heating device and the second heating device refers to Example 5 and will not be repeated here.
[0132] In the above scheme, the rotation of the loading baffle 3 can be achieved manually or mechanically. The control unit displays the rotation direction, rotation angle, rotation scale and other parameters of the loading baffle 3 to the user through the display unit communicated with it, and then the user manually adjusts it. In order to cooperate with the user's manual adjustment, the side baffle is correspondingly provided with a scale or mark for the user to confirm the adjustment position; or the control unit is directly communicated with the motor that drives the loading baffle 3 to rotate, so as to realize the control of the rotation of the loading baffle 3.
[0133] Based on the above scheme, the loading baffle 3 can also be set as a side wall of the material trough 1, forming a part of the material trough 1. Although there is a certain risk of leakage, the probability of leakage can be reduced by adding sealing strips.
[0134] Embodiment 7
[0135] As another embodiment of the present utility model, the difference between this embodiment and the sixth embodiment is that the loading baffle plate 3 is a hollow plate.
[0136] Since the loading baffle 3 is a hollow plate, the disturbance to the slurry level can be greatly reduced by controlling the moving speed of the loading baffle 3 during the adjustment process, thereby being able to adjust the distance between the loading baffle 3 and the coating roller 2 without stopping the coating.
[0137] At this time, the loading baffle 3 has two different control modes. The first mode is to adjust the loading baffle 3 to a fixed position so that the distance between the loading baffle 3 and the coating roller 2 remains unchanged; the second mode is to control the loading baffle 3 to continuously reciprocate in the material trough 1; compared with the first mode, the reciprocating motion of the loading baffle 3 in the second mode stirs the slurry, promotes heat transfer inside the slurry, and can better maintain the consistency of the slurry temperature.
[0138] The control method of the first mode is the same as that of the sixth embodiment, which will not be described in detail here. The control method of the second mode is to drive the feeding baffle 3 to continuously reciprocate in the material tank 1 during the coating process; the reciprocating motion plays a similar role to stirring, thereby improving the temperature consistency of the slurry; and the feeding baffle 3 has a hollow structure, which will not cause obvious disturbance to the slurry during the reciprocating motion. Compared with the solution of additionally setting a stirring device, the system stability of the slurry can be better maintained, thereby improving the coating stability and consistency. The control method of the reciprocating motion of the feeding baffle 3 includes the following steps:
[0139] S1, during the coating process, the feeding baffle is driven to perform reciprocating motion with a preset first motion parameter;
[0140] S2, obtaining the actual temperature parameters of the slurry in the tank;
[0141] S3, judging that the temperature of the slurry along the radial direction of the coating roller is inconsistent according to the actual temperature parameter, and matching the adjustment parameter of the feeding baffle according to the temperature difference between the actual temperature parameter and the coating roller;
[0142] S4. Adjust the reciprocating motion of the feeding baffle according to the adjustment parameters.
[0143] Specifically, the specific process and method for determining whether the slurry temperature is consistent in step S2 and step S3 are the same as those in Example 6 and will not be elaborated here. The difference from Example 6 is that in step S3, the actual temperature parameters and the temperatures of the first heating device and the second heating device are brought into the pre-established coating machine model as initial conditions to simulate the movement of the loading baffle 3 to obtain the adjustment parameters of the loading baffle 3 for maintaining the uniform slurry temperature. The adjustment parameters are the moving speed of the loading baffle 3 for reciprocating motion; it can also be the moving range of the loading baffle 3 for reciprocating motion; it can also include both the moving speed and moving range of the loading baffle 3 for reciprocating motion.
[0144] The temperature adjustment of the first heating device and the second heating device can be further combined to further improve the accuracy of slurry temperature control and expand the temperature control range.
[0145] For example, in step S3, if the temperature difference between the actual temperature parameter and the temperature of the coating roller 2 is greater than 1°C, the difference between the temperature of the coating roller 2 and the actual temperature parameter can be reduced by increasing the temperature of the first heating device on the loading baffle 3 or lowering the temperature of the second heating device in the coating roller 2, thereby more conveniently maintaining the consistency of the slurry temperature; considering that the reciprocating motion of the loading baffle 3 promotes heat transfer inside the slurry, there is no need to adjust the temperature separately according to the different distances between different positions of the loading baffle 3 and the coating roller 2, thereby simplifying the temperature control logic.
[0146] Embodiment 8
[0147] As another embodiment of the present utility model, this embodiment further makes the following improvements on the basis of the sixth embodiment.
[0148] In this embodiment, the control unit is connected in communication with the third heating device for heating the backing roller 10, and controls the temperature of the first heating device and the third heating device.
[0149] Specifically, when the diameters of the coating roller 2 and the back roller 10 are the same or basically the same, the temperatures of the first heating device and the third heating device are usually kept consistent; when the diameters of the coating roller 2 and the back roller 10 are inconsistent, in order to ensure the smooth transfer of the slurry, a speed difference between the coating roller 2 and the back roller 10 is inevitable, and the contact time between the current collector and the back roller 10 may be affected by the change in the speed. This results in the use of back rollers 10 of different sizes, and the temperature required to preheat the current collector to a fixed temperature is not consistent. In order to ensure the stability of the electrode, it is necessary to adjust the temperature of the first heating device and the third heating device within a certain range; when the speed of the back roller 10 is higher than the speed of the coating roller 2, the temperature of the back roller 10 can be appropriately increased to enhance the heating effect on the current collector; when the speed of the back roller 10 is lower than the speed of the coating roller 2, the temperature of the back roller 10 can also be appropriately reduced to avoid excessive heating of the current collector.
[0150] It should be additionally explained that this embodiment can also be used in the electrode coating device described in Example 7. The new technical solution obtained by combining this embodiment with Example 7 is also a specific implementation method of the utility model and falls within the protection scope of the utility model.
[0151] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.
Claims
1. A pole piece coating device, comprising: Trough (1); A coating roller (2) is partially immersed in the material tank (1) and is rotatably arranged relative to the material tank (1); It is characterized in that It also includes a heating device which is arranged in the material trough (1) and the coating roller (2) and is used to heat the material trough (1) and the coating roller (2); the heating devices in the material trough (1) and the coating roller (2) operate independently of each other.
2. The electrode coating device according to claim 1, characterized in that: The temperatures at different positions of the material trough (1) are positively correlated with the distance between the trough wall of the material trough (1) and the coating roller (2).
3. The pole piece coating device according to claim 2, characterized in that: The material trough (1) is divided into a plurality of temperature zones according to the distance between the trough wall and the coating roller (2), a plurality of heating devices are respectively arranged in each temperature zone, and the temperatures of the various temperature zones are adjusted independently of each other.
4. The electrode coating device according to claim 1, characterized in that: The trough (1) comprises: A material loading baffle (3) is arranged in the material trough (1) at a position opposite to the coating roller (2) and is movably connected to the material trough (1); The distance between the loading baffle (3) and the surface of the coating roller (2) is adjustable.
5. The electrode coating device according to claim 1, characterized in that: The trough (1) comprises: A material loading baffle (3) formed as a groove wall on one side of the material groove (1) opposite to the coating roller (2); The distance between the loading baffle (3) and the surface of the coating roller (2) is adjustable.
6. The pole piece coating device according to claim 4 or 5, characterized in that: The loading baffle (3) is rotatably arranged relative to the material trough (1) with a straight line parallel to the rotating axis of the coating roller (2) as an axis.
7. The electrode coating device according to claim 4 or 5, characterized in that: The loading baffle (3) is slidably arranged relative to the material trough (1).
8. The pole piece coating device according to any one of claims 1 to 5, characterized in that: It also includes a backing roller (10), which is arranged side by side with the coating roller (2) to form a film transfer gap between the two; The heating device is provided in the backing roller (10), and the heating of the material tank (1), the coating roller (2) and the backing roller (10) is performed independently of each other.
9. The pole piece coating device according to any one of claims 1 to 5, characterized in that: Also includes, A stirring unit extends into the material tank (1) and is used to stir the slurry in the material tank (1).
10. The pole piece coating device according to any one of claims 1 to 5, characterized in that: Also includes, A control unit, used for matching a target temperature parameter of the heating device according to a difference between an actual temperature parameter and a preset parameter in the trough (1); A temperature detection unit extends into the material trough (1) and is used to obtain actual temperature parameters at different depths along the depth direction of the material trough (1) and send them to a control unit.