Drying oven for coating machine

Abstract

The present application discloses a drying oven for a coating machine, the drying oven comprising: an upper hull and a lower hull, wherein a spacing is set between the upper hull and the lower hull for the transmission of an electrode sheet, the upper hull is provided with first air supply channels configured to face a first surface of the electrode sheet, and the lower hull is provided with second air supply channels configured to face a second surface of the electrode sheet, the first surface and the second surface being arranged opposite each other; and electromagnetic induction coils, which are adapted for passage of the electrode sheet, the projections of the electromagnetic induction coils on the upper hull being staggered with respect to the first air supply channels. Thus, firstly, the drying oven for a coating machine of the present application uses the cooperation of air blowing and electric heating to dry an electrode sheet coating, thereby improving the drying efficiency for the coating. Secondly, heating of the electrode sheet via eddy currents occurs from the inside out, so that the formation of crusts on the outer surface of the electrode sheet coating can be avoided during heating, thereby preventing cracking of the coating, ensuring the drying quality of the coating.

Description

A coating machine oven

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 21, 2023, with application number 202322251224.7 and application name “A Coating Machine Oven”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the technical field of battery production, and in particular to a coating machine oven. Background Art

[0003] During battery production, drying the electrode in a dryer is a crucial step in the electrode coating process. The drying method commonly used in related technologies typically dries the coating from the outside in, with the outer surface of the coating being dried first, followed by drying inwards towards the electrode body.

[0004] However, this method has low drying efficiency, and since the outer surface of the coating is dried first, the coating is prone to crusting, which in turn can easily cause the coating to crack when the solvent inside the coating is discharged.

[0005] In summary, the electrode coating in the related art has the problems of low drying efficiency and poor drying quality.

[0006] Summary of the Invention

[0007] The embodiment of the present application discloses a coating machine oven, which can solve the problems of low drying efficiency and poor drying quality of electrode coating in the related art.

[0008] In order to achieve the above-mentioned purpose, the present application discloses a coating machine oven, comprising: an upper hull and a lower hull, a gap is set between the upper hull and the lower hull for the transmission of the pole piece, the upper hull is provided with a first air supply channel for the first surface facing the pole piece, and the lower hull is provided with a second air supply channel for the second surface facing the pole piece, and the first surface and the second surface are arranged opposite to each other; an electromagnetic induction coil for allowing the pole piece to pass through; the projection of the electromagnetic induction coil on the upper hull is staggered with the first air supply channel.

[0009] Optionally, a plurality of electromagnetic induction coils are provided along the transmission direction of the pole piece.

[0010] Optionally, the electromagnetic induction coils are arranged in pairs to form a coil group, and the two electromagnetic induction coils in the coil group are respectively arranged on two opposite sides of the first air supply channel along the transmission direction of the pole piece.

[0011] Optionally, the first air supply channel and the second air supply channel, and the electromagnetic induction coil and the second air supply channel are staggered with each other along a first direction, wherein the first direction is the direction in which the upper hull and the lower hull are sequentially arranged.

[0012] Optionally, a conveying roller is further included, which is located between the upper hull and the lower hull and is arranged opposite to the first air supply channel along the first direction. The gap between the conveying roller and the first air supply channel is used for the pole piece to pass through.

[0013] Optionally, multiple first air supply channels, second air supply channels, coil groups and conveying rollers are arranged along the transmission direction, wherein multiple coil groups correspond one-to-one to multiple first air supply channels, and the projection of the second air supply channel on the upper hull is alternately arranged with the first air supply channel along the transmission direction.

[0014] Optionally, it also includes a cover shell, wherein the upper hull and the lower hull are both arranged in the inner cavity of the cover shell, a part of the electromagnetic induction coil is located in the inner cavity of the cover shell for the pole piece to pass through, and the other part of the electromagnetic induction coil is passed through a through hole provided on the cover shell; the cover shell is provided with a first air inlet connected to the upper hull, and a second air inlet connected to the lower hull.

[0015] Optionally, it further includes a first filter and a second filter arranged in the cover, the first filter being arranged between the first air inlet and the upper hull, and the second filter being arranged between the second air inlet and the lower hull.

[0016] Optionally, a first cavity, a second cavity, and a partition between the first cavity and the second cavity are provided in the cover; the first air inlet and the second air inlet are both connected to the first cavity; the first filter and the second filter are both provided in the first cavity; the upper hull, the lower hull and the electromagnetic induction coil are all provided in the second cavity; the upper hull is provided with a first air inlet channel, one end of the first air inlet channel passes through the partition to connect to the first cavity, and the first filter is provided between the first air inlet and the first air inlet channel; the lower hull is provided with a second air inlet channel, one end of the second air inlet channel passes through the partition to connect to the first cavity, and the second filter is provided between the second air inlet and the second air inlet channel.

[0017] Optionally, it further includes a junction box connected to the cover, the through hole of the cover is connected to the junction box; wiring is provided in the junction box; at least part of the electromagnetic induction coil extends out of the through hole of the cover and extends into the junction box to connect to the wiring.

[0018] Optionally, a mesh plate or at least one of multiple guide plates is provided in the inner cavity of the upper hull, the guide channel formed between adjacent guide plates corresponds to the first air supply channel, and / or the multiple air guide holes provided in the mesh plate correspond to the first air supply channel.

[0019] Optionally, a mesh plate or at least one of multiple guide plates is provided in the inner cavity of the lower hull, the guide channel formed between adjacent guide plates corresponds to the second air supply channel, and / or the multiple air guide holes provided in the mesh plate correspond to the second air supply channel.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The coating machine oven disclosed in the present application includes: an upper hull and a lower hull, a gap is set between the upper hull and the lower hull for the transmission of the pole piece, the upper hull is provided with a first air supply channel for the first surface facing the pole piece, and the lower hull is provided with a second air supply channel for the second surface facing the pole piece, and the first surface and the second surface are arranged opposite to each other; an electromagnetic induction coil is used for the pole piece to pass through; the projection of the electromagnetic induction coil on the upper hull is staggered with the first air supply channel.

[0022] Thus, during operation, hot air entering through the air inlet of the upper hull can blow across the first surface of the pole piece through the first air supply channel, while hot air entering through the air inlet of the lower hull can blow across the second surface of the pole piece through the second air supply channel, thereby drying the pole piece coating through blowing. At the same time, the induced magnetic field generated by the electromagnetic induction coil after power is applied can generate eddy currents inside the pole piece, thereby drying the pole piece coating through electrical heating.

[0023] In summary, in the first aspect, the coating oven of the present application uses a combination of air blowing and electric heating to dry the electrode coating, which can improve the drying efficiency of the coating. In the second aspect, the eddy current heats the electrode from the inside out, which can prevent the formation of crusting on the outer surface of the electrode coating during heating, thereby preventing the coating from cracking and ensuring the drying quality of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] FIG1 is a front view of the oven disclosed in this application;

[0026] FIG2 is a left side view of the oven disclosed in this application.

[0027] Description of reference numerals:

[0028] X-first direction, Y-transmission direction,

[0029] 1-pole,

[0030] 10-Upper hull,

[0031] 11-first air supply channel, 12-first air inlet channel,

[0032] 20- Lower hull,

[0033] 21- second air supply channel, 22- second air inlet channel,

[0034] 30-Electromagnetic induction coil,

[0035] 40-transfer roller,

[0036] 50-cover,

[0037] 51-feed port, 52-discharge port, 53-first cavity, 54-second cavity, 55-partition plate,

[0038] 61-first filter, 62-second filter,

[0039] 70-junction box. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0042] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to express a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "first," "second," and the like are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0045] During the battery production process, the electrode coating needs to be dried. The drying method used in related technologies is usually to dry the coating from the outside in, that is, the coating surface is dried first, and then gradually dried in the direction close to the electrode body. However, this drying efficiency is low, and it is easy for the coating surface to form a crust, which in turn can easily cause the coating to crack when the solvent inside the coating is discharged. In summary, in order to solve the problems of low drying efficiency and poor drying quality of the electrode coating, the technical solution of this application was developed, which is explained below in conjunction with Figures 1 and 2.

[0046] Please refer to Figures 1 and 2. The present application discloses a coating machine oven, which includes an upper hull 10, a lower hull 20 and an electromagnetic induction coil 30.

[0047] The upper hull 10 and the lower hull 20 are arranged sequentially along a first direction X, which can be understood as the height direction of the coating machine oven or the direction of gravity. A gap is provided between the upper hull 10 and the lower hull 20 to facilitate the transport of the electrode 1. The upper hull 10 is provided with a first air supply channel 11 for the first surface of the electrode 1, and the lower hull 20 is provided with a second air supply channel 21 for the second surface of the electrode 1. The first and second surfaces are arranged opposite each other. The first air supply channel 11 can be a duct structure provided on the surface of the upper hull 10 and extending outward from the upper hull 10, or it can be an air supply port provided outside the upper hull 10. Similarly, the second air supply channel 21 can be a duct structure provided on the surface of the lower hull 20 and extending outward from the lower hull 20, or it can be an air supply port provided outside the lower hull 20. The electromagnetic induction coil 30 is used for the electrode 1 to pass through; the projection of the electromagnetic induction coil 30 on the upper hull 10 is staggered with the first air supply channel 11.

[0048] Thus, during operation, the hot air entering through the air inlet of the upper hull 10 can blow on the first surface of the pole piece 1 through the first air supply channel 11, and the hot air entering through the air inlet of the lower hull 20 can blow on the second surface of the pole piece 1 through the second air supply channel 21, thereby drying the coating of the pole piece 1 through the blowing method. At the same time, the induced magnetic field generated by the electromagnetic induction coil 30 after power is applied can generate eddy currents inside the pole piece 1, thereby drying the coating of the pole piece 1 through electric heating.

[0049] In summary, in the first aspect, the coating oven of the present application uses a combination of air blowing and electric heating to dry the coating on the electrode 1, which can improve the drying efficiency of the coating. In the second aspect, the eddy current heats the electrode 1 from the inside out, which can prevent the formation of crusting on the outer surface of the coating on the electrode 1 during heating, thereby preventing cracking of the coating and ensuring the drying quality of the coating.

[0050] Optionally, a plurality of electromagnetic induction coils 30 are provided along the transmission direction Y of the pole piece 1 to improve the electric heating effect and the drying efficiency and quality of the coating.

[0051] Optionally, the electromagnetic induction coils 30 and the first air supply channel 11 may be arranged alternately along the transmission direction Y of the pole piece 1. However, in order to improve the effect of electric heating, the electromagnetic induction coils 30 are arranged in pairs to form a coil group, and the two electromagnetic induction coils 30 in the coil group are respectively arranged on two opposite sides of the first air supply channel 11 along the transmission direction Y of the pole piece 1.

[0052] As mentioned above, blowing heating can easily cause the coating crust to crack. However, through the above-mentioned setting, the number of electromagnetic induction coils 30 can be set to be larger under the same length of transmission path, and the number of first air supply channels 11 can be appropriately reduced, thereby improving the effect of electric heating while suppressing the blowing heating effect, thereby better uniformly heating the electrode coating and improving the coating quality.

[0053] Optionally, the first air supply channel 11 and the second air supply channel 21, as well as the electromagnetic induction coil 30 and the second air supply channel 21 can be staggered along the first direction X. This allows the components used to dry the electrode 1 to be dispersed as much as possible, thereby facilitating uniform heating of the electrode 1. Of course, the first air supply channel 11 and the second air supply channel 21 can also be arranged relative to each other along the first direction X, which will not be described in detail here.

[0054] Optionally, the coating machine oven may further include a conveying roller 40 provided in the channel, the conveying roller 40 being located between the upper hull 10 and the lower hull 20, and being arranged opposite to the first air supply channel 11 along the first direction X, and the gap between the conveying roller 40 and the first air supply channel 11 being used for the passage of the electrode 1. As mentioned above, the first direction X can be understood as the direction of gravity. In this way, the design of the conveying roller 40 can, on the one hand, be in rolling contact with the electrode 1, thereby reducing the friction force on the electrode 1 during transmission, ensuring smooth transportation of the electrode 1, and on the other hand, can provide support for the electrode 1 to prevent the portion of the electrode 1 between the two adjacent second air supply channels 21 from collapsing, etc.

[0055] Optionally, multiple first air supply channels 11, second air supply channels 21, coil groups, and conveying rollers 40 can be provided along the transmission direction Y. The multiple coil groups correspond one-to-one to the multiple first air supply channels 11, and the projections of the second air supply channels 21 on the upper hull 10 are alternately arranged with the first air supply channels 11 along the transmission direction Y. This can improve the drying effect of the electrode 1, and can make the first air supply channels 11, the second air supply channels 21, the electromagnetic induction coil 30, and other devices used to dry the electrode 1 spread out as much as possible to prevent them from being assembled too closely together and affecting heat dissipation.

[0056] Optionally, the second air supply channels 21 can be arranged alternately with the conveying rollers 40. In the coating machine oven of the present application, the gap between two adjacent second air supply channels 21 is divided into a first gap and a second gap, and the first gap and the second gap are arranged alternately. The conveying rollers 40 are arranged in the first gap. In this way, the number of conveying rollers 40 can be reduced while ensuring the rolling contact effect between the conveying rollers 40 and the electrode 1, thereby ensuring the smooth transportation of the electrode 1.

[0057] Optionally, the coating oven may further include a housing 50, wherein the upper hull 10, lower hull 20, electromagnetic induction coil 30, and conveyor roller 40 are all disposed within the inner cavity of the housing 50. The conveyor roller 40 is rotatably connected to the housing 50. A portion of the electromagnetic induction coil 30 is located within the inner cavity of the housing 50 for passage of the electrode 1; another portion of the electromagnetic induction coil 30 is passed through a through hole provided in the housing 50 for connection to an external power source. The housing 50 is provided with a first air inlet (not shown) connected to the upper hull 10, and a second air inlet (not shown) connected to the lower hull 20. Furthermore, the housing 50 is provided with an inlet 51 and an outlet 52, which are arranged opposite each other along the conveying direction Y. The electrode 1 can enter the inner cavity of the housing 50 through the inlet 51 and, after being purged and dried by the upper hull 10 and lower hull 20, and electrically heated and dried by the electromagnetic induction coil 30, be discharged through the outlet 52. In this way, the setting of the cover shell 50 can provide shielding protection for other components in the coating machine oven, and prevent dust and water, as well as collision.

[0058] Optionally, the coating machine oven may further include a first filter 61 and a second filter 62 provided in the cover 50, wherein the first filter 61 is provided between the first air inlet and the upper hull 10, and the second filter 62 is provided between the second air inlet and the lower hull 20. The provision of the first filter 61 and the second filter 62 can filter the hot air, thereby ensuring the cleanliness of the hot air entering the upper hull 10 and the lower hull 20, preventing external dust and impurities from being blown toward the electrode 1, and further ensuring the drying effect.

[0059] More specifically, the housing 50 is provided with a first cavity 53, a second cavity 54, and a partition 55 located between the first and second cavities 53, 54. Both the first and second air inlets communicate with the first cavity 53; a first filter 61 and a second filter 62 are located within the first cavity 53; and the upper hull 10, the lower hull 20, and the electromagnetic induction coil 30 are located within the second cavity 54. The upper hull 10 may be provided with a first air inlet passage 12, one end of which passes through the partition 55 to communicate with the first cavity 53. The first filter 61 is located between the first air inlet and the first air inlet passage 12. The lower hull 20 may be provided with a second air inlet passage 22, one end of which passes through the partition 55 to communicate with the first cavity 53. The second filter 62 is located between the second air inlet and the second air inlet passage 22.

[0060] In this way, the electrode 1 can be dried in the second cavity 54 , and the dust and impurities filtered out by the first filter 61 and the second filter 62 are blocked in the first cavity 53 and cannot enter the second cavity 54 , further ensuring the drying effect of the electrode 1 .

[0061] Optionally, the coating machine oven may further include a junction box 70 connected to the cover 50. The through-holes of the cover 50 are connected to the junction box 70. A wiring is provided in the junction box 70. At least a portion of the electromagnetic induction coil 30 extends out of the through-holes of the cover 50 and extends into the junction box 70 to connect to the wiring. The end of the wiring away from the electromagnetic induction coil 30 is connected to an external power supply, so that the external power supply supplies power to the electromagnetic induction coil 30 through the wiring. The provision of the junction box 70 can standardize the arrangement of wires such as power cables and data cables, prevent cluttered wiring, and thereby improve appearance and safety performance.

[0062] Optionally, a mesh plate or at least one of a plurality of guide plates is provided in the inner cavity of the upper hull 10, and the guide channel formed between adjacent guide plates corresponds to the first air supply channel 11, and / or the multiple air guide holes provided in the mesh plate correspond to the first air supply channel 11. A mesh plate or at least one of a plurality of guide plates is provided in the inner cavity of the lower hull 20, and the guide channel formed between adjacent guide plates corresponds to the second air supply channel 21, and / or the multiple air guide holes provided in the mesh plate correspond to the second air supply channel 21. In this way, the air volume can be blown out from the first air supply channel 11 in a relatively dispersed and even manner, and blown out from the second air supply channel 21 in a relatively dispersed and even manner, and then blown toward the first surface and the second surface of the pole piece 1, so that each position of the pole piece 1 can be dried more evenly, thereby improving the drying effect.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coating machine oven, comprising: An upper hull (10) and a lower hull (20), wherein a gap is arranged between the upper hull (10) and the lower hull (20) for transmission of the pole piece (1), the upper hull (10) is provided with a first air supply channel (11) facing a first surface of the pole piece (1), and the lower hull (20) is provided with a second air supply channel (21) facing a second surface of the pole piece (1), and the first surface and the second surface are arranged opposite to each other; The electromagnetic induction coil (30) is used for the pole piece (1) to pass through; the projection of the electromagnetic induction coil (30) on the upper hull (10) is staggered with the first air supply channel (11).

2. The coating machine oven according to claim 1, wherein: A plurality of electromagnetic induction coils (30) are arranged along the transmission direction (Y) of the pole piece (1).

3. The coating machine oven according to claim 2, wherein: The electromagnetic induction coils (30) are arranged in pairs to form a coil group, and the two electromagnetic induction coils (30) in the coil group are respectively arranged on two opposite sides of the first air supply channel (11) along the transmission direction (Y) of the pole piece (1).

4. The coating machine oven according to claim 3, wherein: The first air supply channel (11) and the second air supply channel (21), as well as the electromagnetic induction coil (30) and the second air supply channel (21) are staggered with respect to each other along a first direction (X), Wherein, the first direction (X) is the direction in which the upper hull (10) and the lower hull (20) are arranged in sequence.

5. The coating machine oven according to claim 4, wherein: It also includes a conveying roller (40), which is located between the upper hull (10) and the lower hull (20), and is arranged opposite to the first air supply channel (11) along the first direction (X), and the gap between the conveying roller (40) and the first air supply channel (11) is used for the pole piece (1) to pass through.

6. The coating machine oven according to claim 5, wherein: The first air supply channel (11), the second air supply channel (21), the coil group and the conveying roller (40) are all arranged in plurality along the transmission direction (Y). The plurality of coil groups correspond one to one with the plurality of the first air supply channels (11). The projection of the second air supply channel (21) on the upper hull (10) is arranged alternately with the first air supply channel (11) along the transmission direction (Y).

7. The coater oven according to claim 1, wherein: It also includes a cover shell (50), the upper hull (10) and the lower hull (20) are both arranged in the inner cavity of the cover shell (50), a part of the electromagnetic induction coil (30) is located in the inner cavity of the cover shell (50) for the pole piece (1) to pass through, and another part of the electromagnetic induction coil (30) is passed through a through hole arranged on the cover shell (50); The cover shell (50) is provided with a first air inlet connected to the upper hull (10), and a second air inlet connected to the lower hull (20).

8. The coating machine oven according to claim 7, wherein: It also includes a first filter (61) and a second filter (62) disposed in the cover shell (50), wherein the first filter (61) is disposed between the first air inlet and the upper hull (10), and the second filter (62) is disposed between the second air inlet and the lower hull (20).

9. The coating machine oven according to claim 8, wherein: The housing (50) is provided with a first cavity (53), a second cavity (54), and a partition (55) located between the first cavity (53) and the second cavity (54); The first air inlet and the second air inlet are both connected to the first cavity (53); the first filter (61) and the second filter (62) are both arranged in the first cavity (53); the upper hull (10), the lower hull (20) and the electromagnetic induction coil (30) are all arranged in the second cavity (54); The upper hull (10) is provided with a first air inlet channel (12), one end of the first air inlet channel (12) passes through the partition plate (55) to communicate with the first cavity (53), and the first filter (61) is provided between the first air inlet and the first air inlet channel (12); The lower hull (20) is provided with a second air inlet channel (22), one end of the second air inlet channel (22) passes through the partition (55) to communicate with the first cavity (53), and the second filter (62) is provided between the second air inlet and the second air inlet channel (22).

10. The coater oven according to claim 7, wherein: It also includes a junction box (70) connected to the cover shell (50), and the through hole of the cover shell (50) is connected to the junction box (70); The junction box (70) is provided with wiring; at least part of the electromagnetic induction coil (30) It extends out of the through hole of the cover shell (50) and extends into the junction box (70) to connect the wiring.

11. The coater oven according to claim 1, wherein: At least one of a mesh plate or a plurality of guide plates is provided in the inner cavity of the upper hull (10). The guide channel formed between adjacent guide plates corresponds to the first air supply channel (11), and / or, The plurality of air guide holes arranged in the mesh plate correspond to the first air supply channel (11).

12. The coater oven according to claim 1, wherein: The inner cavity of the lower hull (20) is provided with at least one of a mesh plate or a plurality of guide plates. The guide channel formed between adjacent guide plates corresponds to the second air supply channel (21), and / or, The plurality of air guide holes arranged in the mesh plate correspond to the second air supply channel (21).

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