Oven, drying method, coating machine and coating system

Abstract

The present invention relates to the field of lithium battery production, and in particular to an oven, a drying method, a coating machine and a coating system. The oven includes a first nozzle group, a second nozzle group, a third nozzle group, a fourth nozzle group and N roller groups; the first nozzle group includes A first nozzles that are in a first plane and arranged at intervals along a first direction; the second nozzle group includes B second nozzles that are in a second plane and arranged at intervals along a first direction; the third nozzle group includes C third nozzles that are in a third plane and arranged at intervals along a first direction; the fourth nozzle group includes D fourth nozzles that are in a fourth plane and arranged at intervals along a first direction; the four planes are parallel to each other; the length of the projections of the four nozzle groups in the first direction is less than the sum of the lengths of the four nozzle groups in the first direction; the roller group is used to support the pole pieces to flow through the first, second, third and fourth nozzle groups in sequence. The length of the oven in the first direction is reduced, and the floor space of the oven is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to an oven, a drying method, a coating machine and a coating system. Background Art

[0002] The coating process in the existing lithium battery production process is a crucial process. In this process, a wet slurry is coated on the upper and lower surfaces of the foil by a coating machine to form a coated electrode. The wet coated electrode is then baked at high temperature or with hot air in an oven to dry the solvent in the coated electrode to form a dry coated electrode.

[0003] Existing ovens for drying wet coated electrodes generally adopt a solution in which both the front and back sides of the single-sided wet coated electrode are provided with nozzle groups for linear heating and baking. The length of the single-sided wet coating is only half of the sum of the lengths of the corresponding front and back nozzle groups. The length of the single-sided wet coated electrode that the oven can accommodate is equal to the length of the oven. The length of the oven is too long, which leads to the overall length of the coating machine being too long, occupying a large area of ​​the site, and the surface area of ​​the oven occupied by the unit length of the electrode is large, the heat dissipation area is large, and the heat loss is large. Summary of the invention

[0004] The present invention provides an oven, a drying method, a coating machine and a coating system, which are used to solve the technical problem that the oven used for drying coated electrodes in the prior art adopts a linear heating and baking scheme, resulting in the oven being too long and occupying a large area.

[0005] A first aspect of the present invention provides an oven, comprising:

[0006] The first nozzle group, the second nozzle group, the third nozzle group, the fourth nozzle group and N roller groups, 2≤N≤4;

[0007] The first air nozzle group includes A first air nozzles located in a first plane, and the A first air nozzles are arranged at intervals along a first direction;

[0008] The second air nozzle group includes B second air nozzles located in the second plane, and the B second air nozzles are arranged at intervals along the first direction;

[0009] The third air nozzle group includes C third air nozzles located in a third plane, and the C third air nozzles are arranged at intervals along the first direction;

[0010] The fourth air nozzle group includes D fourth air nozzles located in a fourth plane, and the D fourth air nozzles are arranged at intervals along the first direction;

[0011] The first plane, the second plane, the third plane and the fourth plane are parallel to each other, and A, B, C and D are all integers greater than or equal to 1;

[0012] The lengths of the projections of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction are less than the sum of the lengths of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction;

[0013] The N roller groups are used to support the pole piece to flow through the first air nozzle group, the second air nozzle group, the third air nozzle group and the fourth air nozzle group in sequence. When the pole piece passes through the first air nozzle group, the first surface to be dried of the pole piece faces the first air nozzle; when passing through the second air nozzle group, the first surface to be dried faces the second air nozzle; when passing through the third air nozzle group, the second surface to be dried of the pole piece faces the third air nozzle; when passing through the fourth air nozzle group, the second surface to be dried faces the fourth air nozzle.

[0014] In a first possible implementation of the oven of the first aspect, the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group are aligned in a direction perpendicular to the first direction.

[0015] In a second possible implementation of the oven of the first aspect, the second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane;

[0016] The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite;

[0017] The N roller groups include a first roller group and a second roller group;

[0018] The first roller group is arranged between the first plane and the second plane, and the second roller group is arranged between the third plane and the fourth plane.

[0019] In combination with the second possible implementation of the oven of the first aspect, in a third possible implementation of the oven of the first aspect, the first roller group includes a first reversing roller whose axis is located in a fifth plane and a first rollers, the a first rollers and the first reversing roller are sequentially arranged in parallel with each other, the axis of the first roller is perpendicular to the first direction, and a is an integer greater than 1;

[0020] The second roller group includes a second reversing roller whose axis is located in the sixth plane and b second rollers, the b second rollers and the second reversing rollers are sequentially arranged in parallel and spaced apart from each other, the axis of the second roller is perpendicular to the first direction, and b is an integer greater than 1;

[0021] The first plane, the fifth plane and the sixth plane are parallel to each other;

[0022] The first reversing roller is used to adjust the flow direction of the pole piece so that the first surface to be dried changes from facing the first air nozzle to facing the second air nozzle;

[0023] The second reversing roller is used to adjust the flow direction of the pole piece so that the second surface to be dried changes from facing the third air nozzle to facing the fourth air nozzle.

[0024] In combination with the third possible implementation of the oven of the first aspect, in a fourth possible implementation of the oven of the first aspect, the first roller group is further provided with a first direction-changing roller for guiding the pole piece to flow from the first roller to the second roller;

[0025] The second roller group is also provided with a second direction-changing roller and a third direction-changing roller for guiding the pole piece to flow out from the second roller.

[0026] In combination with the third possible implementation of the oven of the first aspect or the fourth possible implementation of the oven of the first aspect, in a fifth possible implementation of the oven of the first aspect, the first air nozzle corresponds to the second air nozzle one-to-one, and the third air nozzle corresponds to the fourth air nozzle one-to-one;

[0027] The first roller corresponds to the first air nozzle, and the second roller corresponds to the third air nozzle;

[0028] Alternatively, the first roller corresponds to the interval between two adjacent first air nozzles, and the second roller corresponds to the interval between two adjacent third air nozzles.

[0029] In a sixth possible implementation of the oven of the first aspect, the first plane and the second plane are located between the third plane and the fourth plane, and the first plane is close to the fourth plane;

[0030] The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite;

[0031] The N roller groups include a first roller group, a second roller group and a third roller group;

[0032] The first roller group is arranged between the first plane and the second plane, the second roller group is arranged between the second plane and the third plane, and the third roller group is arranged between the first plane and the fourth plane.

[0033] In a seventh possible implementation of the oven of the first aspect, the second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane;

[0034] The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite;

[0035] The N roller groups include a first roller group, a second roller group and a third roller group;

[0036] The first roller group is arranged between the first plane and the second plane, the second roller group is arranged between the second plane and the third plane, and the third roller is arranged on a side of the fourth plane away from the third plane.

[0037] In combination with the sixth possible oven of the first aspect or the seventh possible oven of the first aspect, in an eighth possible oven of the first aspect, the first roller group includes a first reversing roller whose axis is located in a fifth plane and a first rollers, the a first rollers and the first reversing roller are sequentially arranged in parallel with each other, the axis of the first roller is perpendicular to the first direction, and a is an integer greater than 1;

[0038] The second roller group includes b second rollers whose axes are located in the sixth plane, the b second rollers are arranged in parallel and spaced apart in sequence, the axes of the second rollers are perpendicular to the first direction, and b is an integer greater than 1;

[0039] The third roller group includes c third rollers whose axes are located in the seventh plane, the c third rollers are arranged in parallel and spaced apart in sequence, the axes of the third rollers are perpendicular to the first direction, and c is an integer greater than 1;

[0040] The first reversing roller is used to adjust the flow direction of the pole piece;

[0041] The first plane, the fifth plane, the sixth plane and the seventh plane are parallel to each other.

[0042] In combination with the eighth possible implementation of the oven of the first aspect, in a ninth possible implementation of the oven of the first aspect, the first air nozzle corresponds to the second air nozzle in one-to-one correspondence, and the third air nozzle corresponds to the fourth air nozzle in one-to-one correspondence;

[0043] The first roller corresponds to the first air nozzle, the second roller corresponds to the third air nozzle, and the third roller corresponds to the fourth air nozzle;

[0044] Alternatively, the first roller corresponds to the interval between two adjacent first air nozzles, the second roller corresponds to the interval between two adjacent third air nozzles, and the third roller corresponds to the interval between two adjacent fourth air nozzles.

[0045] In combination with the sixth possible implementation of the oven of the first aspect or the seventh possible implementation of the oven of the first aspect, in a tenth possible implementation of the oven of the first aspect, the first plane, the second plane, the third plane and the fourth plane are replaced by the fourth plane, the third plane, the second plane and the first plane respectively;

[0046] The first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are replaced by the fourth air nozzle, the third air nozzle, the second air nozzle and the first air nozzle respectively;

[0047] The first roller set and the third roller set are replaced by the third roller set and the first roller set respectively.

[0048] In an eleventh possible implementation of the oven of the first aspect, the first plane and the second plane are located between the third plane and the fourth plane, and the first plane is close to the fourth plane;

[0049] The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite;

[0050] The N roller groups include a first roller group, a second roller group, a third roller group and a fourth roller group;

[0051] The first roller group and the second roller group are arranged between the first plane and the second plane, and the first roller group is close to the first plane;

[0052] The third roller set is arranged between the second plane and the third plane, and the fourth roller set is arranged between the first plane and the fourth plane.

[0053] In a twelfth possible implementation of the oven of the first aspect, the second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane;

[0054] The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite;

[0055] The N roller groups include a first roller group, a second roller group, a third roller group and a fourth roller group;

[0056] The first roller group and the second roller group are arranged between the first plane and the second plane, and the first roller group is close to the first plane;

[0057] The third roller set is arranged between the second plane and the third plane;

[0058] The fourth plane is arranged between the fourth roller set and the third plane.

[0059] In combination with the eleventh possible implementation of the oven of the first aspect or the twelfth possible implementation of the oven of the first aspect, in the twelfth possible implementation of the oven of the first aspect, the first roller group includes a first rollers whose axes are located in the fifth plane, the a first rollers are arranged in parallel and spaced apart in sequence, and the axes of the first rollers are perpendicular to the first direction;

[0060] The second roller group includes b second rollers whose axes are located in the sixth plane, the b second rollers are arranged in parallel and spaced apart in sequence, and the axes of the second rollers are perpendicular to the first direction;

[0061] The third roller group includes c third rollers whose axes are located in the seventh plane, the c third rollers are arranged in parallel and spaced apart in sequence, and the axes of the third rollers are perpendicular to the first direction;

[0062] The fourth roller group includes d fourth rollers whose axes are located in the eighth plane, the d fourth rollers are arranged in parallel and spaced apart in sequence, and the axes of the fourth rollers are perpendicular to the first direction;

[0063] a, b, c and d are all integers greater than 1;

[0064] The first plane, the fifth plane, the sixth plane, the seventh plane and the eighth plane are parallel to each other.

[0065] In combination with the thirteenth possible implementation of the oven of the first aspect, in the fourteenth possible implementation of the oven of the first aspect, the first air nozzle corresponds to the second air nozzle one-to-one, and the third air nozzle corresponds to the fourth air nozzle one-to-one;

[0066] The first roller corresponds to the first air nozzle, the second roller corresponds to the second air nozzle, the third roller corresponds to the third air nozzle, and the fourth roller corresponds to the fourth air nozzle;

[0067] Or, the first roller corresponds to the interval between two adjacent first air nozzles, the second roller corresponds to the interval between two adjacent second air nozzles, the third roller corresponds to the interval between two adjacent third air nozzles, and the fourth roller corresponds to the interval between two adjacent fourth air nozzles.

[0068] In combination with the eleventh possible implementation of the oven of the first aspect or the twelfth possible implementation of the oven of the first aspect, in the fourteenth possible implementation of the oven of the first aspect, the first plane, the second plane, the third plane and the fourth plane are replaced by the fourth plane, the third plane, the second plane and the first plane respectively;

[0069] The first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are replaced by the fourth air nozzle, the third air nozzle, the second air nozzle and the first air nozzle respectively;

[0070] The first roller group, the second roller group, the third roller group and the fourth roller group are replaced by the fourth roller, the third roller, the second roller group and the first roller group respectively.

[0071] In a sixteenth possible implementation of the oven of the first aspect, the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are each provided with a supporting roller whose axis is perpendicular to the first direction.

[0072] In a seventeenth possible implementation of the oven of the first aspect, further comprising:

[0073] Circulation fan, heating pack, circulation duct, return air inlet, fresh air inlet and exhaust air outlet;

[0074] The circulating fan and the heating pack are arranged in the circulating air duct;

[0075] The return air port is arranged at the input end of the circulating air duct;

[0076] The exhaust port is close to the return air port;

[0077] The fresh air inlet is arranged between the exhaust outlet and the circulation fan;

[0078] The output end of the circulation fan is connected to the input end of the heating bag, and the output end of the circulation air duct is connected to the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle.

[0079] In an eighteenth possible implementation of the oven of the first aspect, the oven further includes: a deviation correction unit for moving the pole piece back to a correct flow path.

[0080] A second aspect of the present invention provides a drying method, comprising:

[0081] The pole piece is driven by the roller group to flow with the first to-be-dried surface facing the first air nozzle;

[0082] Drying the first surface to be dried by a first air nozzle group;

[0083] Adjust the flow direction of the electrode piece so that the first surface to be dried faces the second air nozzle;

[0084] The pole piece is driven to flow by the N roller groups, and the first drying surface is dried by the second air nozzle group;

[0085] Adjust the flow direction of the electrode piece so that the second surface to be dried of the electrode piece faces the third air nozzle;

[0086] The pole piece is driven to flow by the N roller groups, and the second surface to be dried is dried by the third air nozzle group;

[0087] Adjust the flow direction of the electrode piece so that the second surface to be dried of the electrode piece faces the fourth air nozzle;

[0088] The pole piece is driven to flow by the N roller groups, and the second surface to be dried is dried by the fourth air nozzle group.

[0089] A third aspect of the present invention provides a coating machine, comprising:

[0090] Any possible oven provided by the first aspect.

[0091] A fourth aspect of the present invention provides a coating system, comprising:

[0092] The third aspect provides any possible coating machine and winding and unwinding device.

[0093] It can be seen from the above technical solutions that the present invention has the following advantages:

[0094] The oven provided by the present invention is provided with a first air nozzle group, a second air nozzle group, a third air nozzle group, a fourth air nozzle group and N roller groups, 2≤N≤4; the first air nozzle group includes A first air nozzles located in a first plane, and the A first air nozzles are arranged at intervals along a first direction; the second air nozzle group includes B second air nozzles located in a second plane, and the B second air nozzles are arranged at intervals along the first direction; the third air nozzle group includes C third air nozzles located in a third plane, and the C third air nozzles are arranged at intervals along the first direction; the fourth air nozzle group includes D fourth air nozzles located in a fourth plane, and the D fourth air nozzles are arranged at intervals along the first direction; the first plane, the second plane, the third plane and the fourth plane are parallel to each other, and A, B, C and D are both integers greater than or equal to 1; the lengths of the projections of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction are less than the sum of the lengths of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction; N roller groups are used to support the pole piece to flow through the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in sequence, when the pole piece passes through the first nozzle group, the first surface of the pole piece to be dried faces the first nozzle, when passing through the second nozzle group, the first surface of the pole piece to be dried faces the second nozzle, when passing through the third nozzle group, the second surface of the pole piece to be dried faces the third nozzle, and when passing through the fourth nozzle group, the second surface of the pole piece to be dried faces the fourth nozzle. The first surface of the electrode to be dried is dried in turn by the first nozzle group and the second nozzle group, and the second surface of the electrode to be dried is dried in turn by the third nozzle group and the fourth nozzle group. Since the length of the projection of the whole formed by the four nozzle groups in the first direction is less than the sum of the lengths of the four nozzle groups in the first direction, the length of the oven in the first direction is less than the sum of the lengths of the four nozzle groups in the first direction, and each nozzle group dries the electrode having a length equal to its own length in the first direction, that is, the oven can dry the electrode longer than its own length, thereby effectively reducing the length of the oven in the first direction and effectively reducing the floor space of the oven while ensuring the drying efficiency remains unchanged.

[0095] At the same time, the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group arranged in a direction perpendicular to the first direction fully utilize the longitudinal space of the oven and improve the space utilization rate of the oven.

[0096] In addition, the reduction in the length of the oven reduces the surface area of ​​the oven occupied by the electrode per unit length, effectively reducing the heat dissipation area of ​​the oven, thereby effectively reducing the heat loss of the oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0098] Figure 1 A schematic diagram of a partial structure of an oven provided in an embodiment of the present invention;

[0099] Figure 2 Another partial structural schematic diagram of an oven provided by an embodiment of the present invention;

[0100] Figure 3 Another partial structural schematic diagram of an oven provided by an embodiment of the present invention;

[0101] Figure 4 Another partial structural schematic diagram of an oven provided by an embodiment of the present invention;

[0102] Figure 5 Another partial structural schematic diagram of an oven provided by an embodiment of the present invention;

[0103] Figure 6 Another partial structural schematic diagram of an oven provided by an embodiment of the present invention;

[0104] Figure 7 A schematic diagram of the structure of an oven provided by an embodiment of the present invention;

[0105] in:

[0106] 11. First air nozzle 12. Second air nozzle 13. Third air nozzle

[0107] 14, fourth air nozzle 15, support roller 21, first support roller

[0108] 22, second roller 23, third roller 24, fourth roller

[0109] 31, first reversing roller 32, second reversing roller 33, third reversing roller

[0110] 34, fourth reversing roller 35, fifth reversing roller 41, first reversing roller

[0111] 42, second direction-changing roller 43, third direction-changing roller 51, upper shell

[0112] 52, lower housing 6, pole piece 71, first coating assembly

[0113] 72. Second coating assembly 8. Support roller. DETAILED DESCRIPTION

[0114] The embodiments of the present invention provide an oven, a drying method, a coater and a coating system, which are used to solve the technical problem that the oven used to dry the coated electrode in the prior art adopts a linear heating and baking solution, which makes the oven too long and occupies a large area.

[0115] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0116] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0117] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0118] Existing ovens for drying wet coated electrodes generally adopt a solution in which both the front and back sides of the single-sided wet coated electrode are equipped with nozzle groups for linear heating and baking. The length of the single-sided wet coating is only half of the sum of the lengths of the corresponding front and back nozzle groups. The length of the single-sided wet coated electrode that the oven can accommodate is equal to the length of the oven. The length of the oven is too long, which leads to the overall length of the coating machine being too long, occupying a large area of ​​the site, the surface area of ​​the oven occupied by the unit length of the electrode is large, the heat dissipation area is large, and the heat loss is large.

[0119] Embodiment 1

[0120] See also Figure 1-7, an oven provided by an embodiment of the present invention comprises:

[0121] The first wind nozzle group, the second wind nozzle group, the third wind nozzle group, the fourth wind nozzle group and N roller groups, 2≤N≤4; the first wind nozzle group includes A first wind nozzles 11 in the first plane, and the A first wind nozzles 11 are arranged at intervals along the first direction; the second wind nozzle group includes B second wind nozzles 12 in the second plane, and the B second wind nozzles 12 are arranged at intervals along the first direction; the third wind nozzle group includes C third wind nozzles 13 in the third plane, and the C third wind nozzles 13 are arranged at intervals along the first direction; the fourth wind nozzle group includes D fourth wind nozzles 14 in the fourth plane, and the D fourth wind nozzles 14 are arranged at intervals along the first direction; the first plane, the second plane, the third plane and the fourth plane are parallel to each other, A, B, C and D are all integers greater than or equal to 1; the lengths of the projections of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction are less than the sum of the lengths of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction; N roller groups are used to support the pole piece 6 to flow through the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in sequence, when the pole piece 6 passes through the first nozzle group, the first surface to be dried of the pole piece 6 faces the first nozzle 11, when passing through the second nozzle group, the first surface to be dried faces the second nozzle 12, when passing through the third nozzle group, the second surface to be dried of the pole piece 6 faces the third nozzle 13, and when passing through the fourth nozzle group, the second surface to be dried faces the fourth nozzle 14.

[0122] It should be noted that the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 serve as windows for letting in hot air, and their shapes are not specifically limited. The number of the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 is set according to actual needs, and the number of the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 may be the same or different.

[0123] The first direction is parallel to the flow direction of the pole piece 6 on the roller assembly.

[0124] There is a gap between the first air nozzle 11 and the second air nozzle 12, there is a gap between the second air nozzle 12 and the third air nozzle 13, and there is a gap between the third air nozzle 13 and the fourth air nozzle 14, that is, the first plane, the second plane, the third plane and the fourth plane are spaced and parallel.

[0125] The length of the projection of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction is less than the sum of the lengths of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction, that is, the sum of the length of the first nozzle group in the first direction, the length of the second nozzle group in the first direction, the length of the third nozzle group in the first direction and the length of the fourth nozzle group in the first direction is greater than the length of the projection of the whole composed of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction; the smaller the length of the projection of the whole composed of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction, the smaller the length of the oven in the first direction.

[0126] The first surface to be dried and the second surface to be dried are two opposite surfaces of the electrode piece 6 on which the wet slurry is coated.

[0127] Working principle of the oven: the roller group provides support for the electrode 6, so that the electrode 6 flows from one end of the first nozzle group in the first direction to the other end of the first nozzle group in the first direction with the first surface to be dried facing the first nozzle 11. During the flow process, the multiple first nozzles 11 constituting the first nozzle group continuously blow out hot air to dry the wet slurry on the first surface to be dried for the first time; when the electrode 6 flows to the end of the first nozzle group, the roller group adjusts the flow direction of the electrode 6, so that the electrode 6 enters the gap between the second nozzle group and the roller group with the first surface to be dried facing the second nozzle 12, and the roller group continues to provide support for the electrode 6, so that the electrode 6 flows from one end of the second nozzle group in the first direction to the other end of the second nozzle group in the first direction with the first surface to be dried facing the second nozzle 12. During the flow process, the multiple second nozzles 12 constituting the second nozzle group continuously blow out hot air to dry the wet slurry on the first surface to be dried for the second time; when the electrode 6 flows to the end of the second nozzle group, the roller group adjusts the flow direction of the electrode 6, so that The pole piece 6 enters the gap between the third air nozzle group and the roller group with the second surface to be dried facing the third air nozzle 13, and the roller group continues to provide support for the pole piece 6, so that the pole piece 6 flows from one end of the third air nozzle group in the first direction to the other end of the third air nozzle group in the first direction with the second surface to be dried facing the third air nozzle 13. During the flow process, the multiple third air nozzles 13 constituting the third air nozzle group continuously blow out hot air to perform the first drying of the wet slurry on the second surface to be dried; when the pole piece 6 flows to the end of the third air nozzle group, the roller group adjusts the flow direction of the pole piece 6, so that the pole piece 6 enters the gap between the fourth air nozzle group and the roller group with the second surface to be dried facing the fourth air nozzle 14, and the roller group continues to provide support for the pole piece 6, so that the pole piece 6 flows from one end of the fourth air nozzle group in the first direction to the other end of the fourth air nozzle group in the first direction with the second surface to be dried facing the fourth air nozzle 14. During the flow process, the multiple fourth air nozzles 14 constituting the fourth air nozzle group continuously blow out hot air to perform the second drying of the wet slurry on the second surface to be dried.

[0128] The beneficial effects of this embodiment include:

[0129] ① The first surface of the electrode to be dried is dried in turn by the first nozzle group and the second nozzle group, and the second surface of the electrode to be dried is dried in turn by the third nozzle group and the fourth nozzle group. Since the length of the projection of the whole formed by the four nozzle groups in the first direction is less than the sum of the lengths of the four nozzle groups in the first direction, the length of the oven in the first direction is less than the sum of the lengths of the four nozzle groups in the first direction, and each nozzle group dries the electrode having a length equal to its own length in the first direction, that is, the oven can dry the electrode longer than its own length, thereby effectively reducing the length of the oven in the first direction and effectively reducing the floor space of the oven while ensuring the drying efficiency remains unchanged.

[0130] ② The first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group are aligned and arranged in a direction perpendicular to the first direction, so that the longitudinal space of the oven is fully utilized and the space utilization rate of the oven is improved.

[0131] ③ The reduction in the length of the oven reduces the surface area of ​​the oven occupied by the unit length of the electrode, effectively reducing the heat dissipation area of ​​the oven, thereby effectively reducing the energy consumption of the oven.

[0132] ④ The electrode outlet and electrode inlet of the oven can be set on the same side, which makes the configuration of operators more flexible while meeting the production efficiency.

[0133] ⑤The size of the oven is reduced, the operation is more flexible, the installation is more convenient, and the requirements for the factory building are reduced.

[0134] A preferred arrangement of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group: the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group are aligned in a direction perpendicular to the first direction, that is, the lengths of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction are equal, and the projections in the first direction coincide, so that each nozzle group dries a pole piece equal to its length in the first direction, and the length of the pole piece to be dried is twice the length of the first nozzle group in the first direction, that is, the oven can dry a pole piece 6 twice its own length. The following description is based on this arrangement.

[0135] A first preferred combination of N roller groups, a first wind nozzle group, a second wind nozzle group, a third wind nozzle group and a fourth wind nozzle group: the second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane; the wind directions of the first wind nozzle 11 and the second wind nozzle 12 are opposite, and the wind directions of the third wind nozzle 13 and the fourth wind nozzle 14 are opposite; the N roller groups include a first roller group and a second roller group; the first roller group is arranged between the first plane and the second plane, and the second roller group is arranged between the third plane and the fourth plane.

[0136] Exemplary: Figure 1 As shown, the first wind nozzle group, the first roller group, the second wind nozzle group, the fourth wind nozzle group, the second roller group and the third wind nozzle group are arranged in sequence from top to bottom; the multiple first wind nozzles 11 constituting the first wind nozzle group are arranged in sequence from left to right, and the wind direction of the first wind nozzle 11 is downward; the multiple second wind nozzles 12 constituting the second wind nozzle group are arranged in sequence from left to right, and the wind direction of the second wind nozzles 12 is upward; the multiple third wind nozzles 13 constituting the third wind nozzle group are arranged in sequence from left to right, and the wind direction of the third wind nozzles 13 is upward; the multiple fourth wind nozzles 14 constituting the fourth wind nozzle group are arranged in sequence from left to right, and the wind direction of the fourth wind nozzles 14 is downward.

[0137] A preferred implementation of the first roller group and the second roller group: the first roller group includes a first reversing roller 31 with an axis located in the fifth plane and a first rollers 21, the a first rollers 21 and the first reversing roller 31 are arranged in parallel and spaced apart in sequence, the axis of the first roller 21 is perpendicular to the first direction, and a is an integer greater than 1; the second roller group includes a second reversing roller 32 with an axis located in the sixth plane and b second rollers 22, the b second rollers 22 and the second reversing roller 32 are arranged in parallel and spaced apart in sequence, the axis of the second roller 22 is perpendicular to the first direction, and b is an integer greater than 1; the first plane, the fifth plane and the sixth plane are parallel to each other; the first reversing roller 31 is used to adjust the flow direction of the pole piece 6 so that the first surface of the pole piece 6 to be dried changes from facing the first air nozzle 11 to facing the second air nozzle 12; the second reversing roller 32 is used to adjust the flow direction of the pole piece 6 so that the second surface of the pole piece 6 to be dried changes from facing the third air nozzle 13 to facing the fourth air nozzle 14.

[0138] Exemplary: Figure 1 As shown, multiple first rollers 21 and a first reversing roller 31 constituting a first roller group are arranged in sequence from left to right, and the first rollers 21 and the first reversing roller 31 having the same shape both extend in the front-to-back direction; a second reversing roller 32 and multiple second rollers 22 constituting a second roller group are arranged in sequence from left to right, and the second rollers 22 and the second reversing roller 32 having the same shape both extend in the front-to-back direction; the first roller 21 and the second roller 22 have the same shape, and in addition, a third reversing roller 33 is further provided on the left side of the second roller 22 on the far left, through which the pole piece 6 flowing out of the second coating assembly 72 is guided to the second roller 22.

[0139] Further optimization: the first roller group is also provided with a first changing roller 41 for guiding the pole piece 6 to flow from the first roller 21 to the second roller 22; the second roller group is also provided with a second changing roller 42 and a third changing roller 43 for guiding the pole piece 6 to flow out from the gap between the second roller group and the fourth nozzle group.

[0140] Exemplary: Figure 1As shown, the first direction-changing roller 41 is located at the lower left of the first roller 21 on the far left, and the longitudinal interval between the upper circumference of the first roller 21 on the far left and the lower circumference of the first roller 21 on the far left is equal to the thickness of the pole piece 6; the second direction-changing roller 42 is located at the upper left of the second roller 22 on the far left, and the longitudinal interval between the lower circumference of the first roller 22 on the far right and the upper circumference of the second roller 22 on the far right is equal to the thickness of the pole piece 6; the third direction-changing roller 43 is arranged above the second direction-changing roller 42, and the axis is coaxial with the axis of the second direction-changing roller 42. Vertical plane; the third direction-changing roller 43 is located between the second air nozzle group and the fourth air nozzle group, and the first direction-changing roller 41 is located at the upper left of the third direction-changing roller 43; the first direction-changing roller 41, the second direction-changing roller 42, and the third direction-changing roller 43 all extend in the front-to-back direction, and have the same shape as the first roller 21. In addition, in order to guide the final outflow from the right side of the oven, a plurality of rollers 8 extending forward and backward are intermittently arranged between the second air nozzle group and the fourth air nozzle group, and the plurality of rollers 8 are arranged from left to right in an up-and-down alternating manner.In this way, the pole piece 6 forms a first surface to be dried after being coated by the first coating assembly 71, and enters the gap between the first air nozzle 11 and the first roller 21 from the left end with the first surface to be dried facing upward, and flows to the right with the first surface to be dried facing upward supported by the upper surfaces of the plurality of first rollers 21. During the flow, the first surface to be dried is continuously subjected to the hot air blown out by the first air nozzle 11; when it flows to the first reversing roller 31 located at the rightmost end, it turns downward and then turns left under the guidance of the first reversing roller 31, and the first surface to be dried is turned to the left. The first drying surface is directed to the first roller 33, and then the first drying surface is directed to the second roller 33. The first drying surface is directed to the second roller 33, and then the first drying surface is directed to the second roller 33. The first drying surface is directed to the second roller 33, and then the first drying surface is directed to the second roller 33. The drying roller 22 is directed to the left of the drying roller 14 and the right of the drying roller 26. The drying roller 22 is directed to the right of the drying roller 14 and the right of the drying roller 26. The drying roller 22 is directed to the right of the drying roller 14 and the right of the drying roller 26. The drying roller 22 is directed to the right of the drying roller 14 and the right of the drying roller 26. The drying roller 22 is directed to the right of the drying roller 14 and the right of the drying roller 26. The air flows to the left in a gap between the rollers 22, with the support of the upper surfaces of the multiple second rollers 22, while keeping the second surface to be dried facing upward. On the way, the second surface to be dried is continuously subjected to the hot air blown out by the fourth air nozzle 14. When it flows to the second changing roller 42, it turns upward under the guidance of the second changing roller 42 and flows upward. When it flows to the third changing roller 43, it turns right under the guidance of the third changing roller, and then flows to the right under the support of the multiple rollers 8, and finally flows out from the right end of the gap between the second air nozzle group and the third air nozzle group.

[0141] A preferred arrangement of the first air nozzle group, the second air nozzle group, the third air nozzle group, the fourth air nozzle group, the first roller group and the second roller group: the first air nozzle 11 corresponds to the second air nozzle 12 one by one, and the third air nozzle 13 corresponds to the fourth air nozzle 14 one by one; the first roller 21 corresponds to the first air nozzle 11, and the second roller 22 corresponds to the third air nozzle 13. That is, the number of the first air nozzle 11, the second air nozzle 12 and the first roller 21 is the same, and the wind direction of each first air nozzle 11 will be collinear with the wind direction of a second air nozzle 12, and the straight line where the wind direction of each first air nozzle 11 is located will intersect perpendicularly with the axis of a first roller 21; the number of the third air nozzle 13, the fourth air nozzle 14 and the second roller 22 is the same, and the wind direction of each third air nozzle 13 will be collinear with the wind direction of a fourth air nozzle 14, and the straight line where the wind direction of each third air nozzle 13 is located will intersect perpendicularly with the axis of a second roller 22. Similar preferred arrangements below are the same as this preferred arrangement and will not be described in detail.

[0142] Another preferred arrangement of the first nozzle group, the second nozzle group, the third nozzle group, the fourth nozzle group, the first roller group and the second roller group is as follows: Figure 1 As shown, the first air nozzle 11 corresponds to the second air nozzle 12, and the third air nozzle 13 corresponds to the fourth air nozzle 14; the first roller 21 corresponds to the interval between two adjacent first air nozzles 11, and the second roller 22 corresponds to the interval between two adjacent third air nozzles 13. That is, the number of first air nozzles 11 and second air nozzles 12 is the same, and the wind direction of each first air nozzle 11 will be collinear with the wind direction of a second air nozzle 12; the number of third air nozzles 13 and fourth air nozzles 14 is the same, and the wind direction of each third air nozzle 13 will be collinear with the wind direction of a fourth air nozzle 14. Similar preferred arrangements below are the same as this preferred arrangement, and will not be repeated one by one.

[0143] The second preferred combination of N roller groups, the first wind nozzle group, the second wind nozzle group, the third wind nozzle group and the fourth wind nozzle group: the first plane and the second plane are located between the third plane and the fourth plane, and the first plane is close to the fourth plane; the wind directions of the first wind nozzle 11 and the second wind nozzle 12 are opposite, and the wind directions of the third wind nozzle 13 and the fourth wind nozzle 14 are opposite; the N roller groups include the first roller group, the second roller group and the third roller group; the first roller group is arranged between the first plane and the second plane, the second roller group is arranged between the second plane and the third plane, and the third roller group is arranged between the first plane and the fourth plane.

[0144] Exemplary: Figure 2As shown, the fourth wind nozzle group, the third roller group, the first wind nozzle group, the first roller group, the second wind nozzle group, the second roller group and the third wind nozzle group are arranged in sequence from top to bottom; the multiple first wind nozzles 11 constituting the first wind nozzle group are arranged in sequence from left to right, and the wind direction of the first wind nozzle 11 is downward; the multiple second wind nozzles 12 constituting the second wind nozzle group are arranged in sequence from left to right, and the wind direction of the second wind nozzles 12 is upward; the multiple third wind nozzles 13 constituting the third wind nozzle group are arranged in sequence from left to right, and the wind direction of the third wind nozzles 13 is upward; the multiple fourth wind nozzles 14 constituting the fourth wind nozzle group are arranged in sequence from left to right, and the wind direction of the fourth wind nozzles 14 is downward.

[0145] A third preferred combination of N roller groups, a first wind nozzle group, a second wind nozzle group, a third wind nozzle group and a fourth wind nozzle group: the second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane; the wind directions of the first wind nozzle 11 and the second wind nozzle 12 are opposite, and the wind directions of the third wind nozzle 13 and the fourth wind nozzle 14 are opposite; the N roller groups include the first roller group, the second roller group and the third roller group; the first roller group is arranged between the first plane and the second plane, the second roller group is arranged between the second plane and the third plane, and the third roller group is arranged on the side of the fourth plane away from the third plane.

[0146] Exemplary: Figure 3 As shown, the first wind nozzle group, the first roller group, the second wind nozzle group, the second roller group, the third wind nozzle group, the fourth wind nozzle group and the third roller group are arranged in sequence from top to bottom; the multiple first wind nozzles 11 constituting the first wind nozzle group are arranged in sequence from left to right, and the wind direction of the first wind nozzle 11 is downward; the multiple second wind nozzles 12 constituting the second wind nozzle group are arranged in sequence from left to right, and the wind direction of the second wind nozzles 12 is upward; the multiple third wind nozzles 13 constituting the third wind nozzle group are arranged in sequence from left to right, and the wind direction of the third wind nozzles 13 is upward; the multiple fourth wind nozzles 14 constituting the fourth wind nozzle group are arranged in sequence from left to right, and the wind direction of the fourth wind nozzles 14 is downward.

[0147] A preferred implementation of the first roller group, the second roller group and the third roller group: the first roller group includes a first reversing roller 31 with an axis located in the fifth plane and a first rollers 21, the a first rollers 21 and the first reversing roller 31 are arranged in parallel and spaced apart in sequence, the axis of the first roller 21 is perpendicular to the first direction, and a is an integer greater than 1; the second roller group includes b second rollers 22 with an axis located in the sixth plane, the b second rollers 22 are arranged in parallel and spaced apart in sequence, the axis of the second roller 22 is perpendicular to the first direction, and b is an integer greater than 1; the third roller group includes c third rollers 23 with an axis located in the seventh plane, the c third rollers 23 are arranged in parallel and spaced apart in sequence, the axis of the third roller 23 is perpendicular to the first direction, and c is an integer greater than 1; the first reversing roller 31 is used to adjust the flow direction of the pole piece 6; the first plane, the fifth plane, the sixth plane and the seventh plane are parallel to each other.

[0148] Exemplarily: a plurality of first rollers 21 and a first reversing roller 31 are arranged in sequence from left to right; a plurality of second rollers 22 are arranged in sequence from left to right; a plurality of third rollers 23 are arranged in sequence from left to right; the first roller 21, the second roller 22, the third roller 23 and the first reversing roller 31 have the same shape and extend in the front-to-back direction.

[0149] like Figure 2 As shown, in the second preferred combination, the first roller group is further provided with a first change-direction roller 41 which is arranged at a distance from the left lower side of the first roller 21 on the leftmost side; the second roller group is further provided with a second change-direction roller 32 and a third change-direction roller 33, the second change-direction roller 32 is arranged at a distance from the left side of the second roller 22 on the leftmost side, and the axis is in the same vertical plane as the axis of the first change-direction roller 41, and the third change-direction roller 33 is arranged at a distance from the right side of the second roller 22 on the rightmost side; the third roller group is further provided with a fourth change-direction roller 34, the fourth change-direction roller 34 is arranged at a distance from the right side of the third roller 23 on the rightmost side, and the axis is in the same vertical plane as the axis of the third change-direction roller 33. In this preferred combination, the design principles of the change-direction roller and the change-direction roller are the same as those of the change-direction roller and the change-direction roller in the first preferred combination, and will not be described one by one here. At the same time, the flow path of the pole piece 6 can refer to the corresponding drawings, and will not be described one by one here, and the same applies to the following.

[0150] like Figure 3 As shown, in the third preferred combination, the first roller group is further provided with a first direction-changing roller 41, which is spaced at the lower left of the first roller 21 on the far left; the second roller group is further provided with a second direction-changing roller 32 and a second direction-changing roller 42, which are spaced at the left side of the second roller 22 on the far left, and the second direction-changing roller 42 are spaced at the lower right of the second roller 22 on the far right; the third roller group is further provided with a third direction-changing roller 43, which is spaced at the upper right of the third roller 23 on the far right.

[0151] A preferred arrangement of the first nozzle group, the second nozzle group, the third nozzle group, the fourth nozzle group, the first roller group, the second roller group and the third roller group: the first nozzle 11 corresponds to the second nozzle 12 one by one, the third nozzle 13 corresponds to the fourth nozzle 14 one by one; the first roller 21 corresponds to the first nozzle 11, the second roller 22 corresponds to the third nozzle 13, and the third roller 23 corresponds to the fourth nozzle 14. This preferred arrangement can be used in combination with the second or third preferred combination.

[0152] Another preferred arrangement of the first nozzle group, the second nozzle group, the third nozzle group, the fourth nozzle group, the first roller group, the second roller group and the third roller group: the first nozzle 11 corresponds to the second nozzle 12 one by one, the third nozzle 13 corresponds to the fourth nozzle 14 one by one; the first roller 21 corresponds to the interval between two adjacent first nozzles 11, the second roller 22 corresponds to the interval between two adjacent third nozzles 13, and the third roller 23 corresponds to the interval between two adjacent fourth nozzles 14. This preferred arrangement can be used in combination with the second or third preferred combination.

[0153] Alternatives to the second and third preferred combinations: the first plane, the second plane, the third plane and the fourth plane are replaced by the fourth plane, the third plane, the second plane and the first plane respectively; the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 are replaced by the fourth air nozzle 14, the third air nozzle 13, the second air nozzle 12 and the first air nozzle 11 respectively; the first roller group and the third roller group are replaced by the third roller group and the first roller group respectively. That is, when the structure of the oven remains unchanged, the positions of the first coating component 71 and the second coating component 72 are adaptively adjusted to allow the pole piece 6 to flow in the opposite direction in the same flow path, and the pole piece outlet of the oven becomes the pole piece inlet, and the pole piece inlet becomes the pole piece outlet, such as: in the third preferred combination, the pole piece 6 enters the oven from the upper left after being coated by the first coating component 71 and flows out of the oven from the lower left. After replacement, the pole piece 6 enters the oven from the lower left after being coated by the first coating component 71 and flows out of the oven from the upper left.

[0154] A fourth preferred combination of N roller groups, a first wind nozzle group, a second wind nozzle group, a third wind nozzle group and a fourth wind nozzle group: the first plane and the second plane are located between the third plane and the fourth plane, and the first plane is close to the fourth plane; the wind directions of the first wind nozzle 11 and the second wind nozzle 12 are opposite, and the wind directions of the third wind nozzle 13 and the fourth wind nozzle 14 are opposite; N roller groups include the first roller group, the second roller group, the third roller group and the fourth roller group; the first roller group and the second roller group are arranged between the first plane and the second plane, and the first roller group is close to the first plane; the third roller group is arranged between the second plane and the third plane, and the fourth roller group is arranged between the first plane and the fourth plane.

[0155] Exemplary: Figure 4 As shown, the fourth wind nozzle group, the fourth roller group, the first wind nozzle group, the first roller group, the second roller group, the second wind nozzle group, the third roller group and the third wind nozzle group are arranged in sequence from top to bottom; the multiple first wind nozzles 11 constituting the first wind nozzle group are arranged in sequence from left to right, and the wind direction of the first wind nozzle 11 is downward; the multiple second wind nozzles 12 constituting the second wind nozzle group are arranged in sequence from left to right, and the wind direction of the second wind nozzles 12 is upward; the multiple third wind nozzles 13 constituting the third wind nozzle group are arranged in sequence from left to right, and the wind direction of the third wind nozzles 13 is upward; the multiple fourth wind nozzles 14 constituting the fourth wind nozzle group are arranged in sequence from left to right, and the wind direction of the fourth wind nozzles 14 is downward.

[0156] A fifth preferred combination of N roller groups, a first wind nozzle group, a second wind nozzle group, a third wind nozzle group and a fourth wind nozzle group: the second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane; the wind directions of the first wind nozzle 11 and the second wind nozzle 12 are opposite, and the wind directions of the third wind nozzle 13 and the fourth wind nozzle 14 are opposite; N roller groups include the first roller group, the second roller group, the third roller group and the fourth roller group; the first roller group and the second roller group are arranged between the first plane and the second plane, and the first roller group is close to the first plane; the third roller group is arranged between the second plane and the third plane; the fourth plane is arranged between the fourth roller group and the third plane.

[0157] Exemplary: Figure 5 As shown, the first wind nozzle group, the first roller group, the second roller group, the second wind nozzle group, the third roller group, the third wind nozzle group, the fourth wind nozzle group and the fourth roller group are arranged in sequence from top to bottom; the multiple first wind nozzles 11 constituting the first wind nozzle group are arranged in sequence from left to right, and the wind direction of the first wind nozzle 11 is downward; the multiple second wind nozzles 12 constituting the second wind nozzle group are arranged in sequence from left to right, and the wind direction of the second wind nozzles 12 is upward; the multiple third wind nozzles 13 constituting the third wind nozzle group are arranged in sequence from left to right, and the wind direction of the third wind nozzles 13 is upward; the multiple fourth wind nozzles 14 constituting the fourth wind nozzle group are arranged in sequence from left to right, and the wind direction of the fourth wind nozzles 14 is downward.

[0158] A preferred implementation of the first roller group, the second roller group, the third roller group and the fourth roller group: the first roller group includes a first roller 21 with an axis located in the fifth plane, the a first rollers 21 are arranged in parallel and spaced in sequence, and the axis of the first roller 21 is perpendicular to the first direction; the second roller group includes b second rollers 22 with an axis located in the sixth plane, the b second rollers 22 are arranged in parallel and spaced in sequence, and the axis of the second roller 22 is perpendicular to the first direction; the third roller group includes c third rollers 23 with an axis located in the seventh plane, the c third rollers 23 are arranged in parallel and spaced in sequence, and the axis of the third roller 23 is perpendicular to the first direction; the fourth roller group includes d fourth rollers 24 with an axis located in the eighth plane, the d fourth rollers 24 are arranged in parallel and spaced in sequence, and the axis of the fourth roller 24 is perpendicular to the first direction; a, b, c and d are all integers greater than 1; the first plane, the fifth plane, the sixth plane, the seventh plane and the eighth plane are parallel to each other.

[0159] Exemplarily: multiple first rollers 21 are arranged in sequence from left to right; multiple second rollers 22 are arranged in sequence from left to right; multiple third rollers 23 are arranged in sequence from left to right; multiple fourth rollers 24 are arranged in sequence from left to right; the first rollers 21, the second rollers 22, the third rollers 23 and the fourth rollers 24 have the same shape and extend in the front-to-back direction.

[0160] like Figure 4 As shown, in the fourth preferred combination, the first roller group is further provided with a first reversing roller 31, which is arranged at intervals on the right side of the first rightmost roller 21; the second roller group is further provided with a second reversing roller 32 and a first changing roller 41, which is arranged at intervals on the right side of the second rightmost roller 22, and the first changing roller 41 is arranged at intervals on the lower left of the second leftmost roller 22; the third roller group is further provided with a third reversing roller 33 and a fourth reversing roller 34, the third reversing roller 33 is arranged at intervals on the left side of the third roller 23 on the left side, and the axis is in the same vertical plane with the axis of the first changing roller 41, and the fourth reversing roller 34 is arranged at intervals on the right side of the third roller 23 on the right side; the fourth roller group is further provided with a fifth reversing roller 35, which is arranged at intervals on the right side of the fourth roller 24 on the right side, and the axis is in the same vertical plane with the axis of the fourth reversing roller 34.

[0161] like Figure 5As shown, in the fifth preferred combination, the first roller group is further provided with a first reversing roller 31, which is arranged at intervals on the right side of the first rightmost roller 21; the second roller group is further provided with a second reversing roller 32 and a first changing roller 41, the second reversing roller 32 is arranged at intervals on the right side of the second rightmost roller 22, and the axis is in the same vertical plane as the axis of the first reversing roller 31, and the first changing roller 41 is arranged at intervals on the lower left of the second leftmost roller 22; the third roller group is further provided with a third reversing roller 33 and a second changing roller 42, the third reversing roller 33 is arranged at intervals on the left side of the third leftmost roller 23, and the second changing roller 42 is arranged at intervals on the lower right of the third rightmost roller 23; the fourth roller group is further provided with a third changing roller 43, the third changing roller 43 is arranged at intervals on the upper right of the fourth rightmost roller 24, and the axis is in the same vertical plane as the axis of the second changing roller 42.

[0162] Optionally, if the span between the reversing roller and the direction-changing roller is too large, an additional roller may be provided between the reversing roller and the direction-changing roller to support the pole piece 6. Similarly, if the span between the two direction-changing rollers is too large, an additional roller may be provided between the two direction-changing rollers to support the pole piece 6. The axis of the additional roller may be coplanar with the axis of the direction-changing roller or may not be coplanar. When they are coplanar, the flow path of the pole piece remains unchanged. When they are not coplanar, the flow path of the pole piece 6 increases, thereby increasing the pole piece capacity of the oven.

[0163] A preferred arrangement of the first roller group, the second roller group, the third roller group, the fourth roller group, the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group: the first nozzle 11 corresponds to the second nozzle 12 one by one, and the third nozzle 13 corresponds to the fourth nozzle 14 one by one; the first roller 21 corresponds to the first nozzle 11, the second roller 22 corresponds to the second nozzle 12, the third roller 23 corresponds to the third nozzle 13, and the fourth roller 24 corresponds to the fourth nozzle 14. This preferred arrangement can be combined with the fourth or fifth preferred combination.

[0164] Another preferred arrangement of the first roller group, the second roller group, the third roller group, the fourth roller group, the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group: the first nozzle 11 corresponds to the second nozzle 12 one by one, and the third nozzle 13 corresponds to the fourth nozzle 14 one by one; the first roller 21 corresponds to the interval between two adjacent first nozzles 11, the second roller 22 corresponds to the interval between two adjacent second nozzles 12, the third roller 23 corresponds to the interval between two adjacent third nozzles 13, and the fourth roller 24 corresponds to the interval between two adjacent fourth nozzles 14. This preferred arrangement can be combined with the fourth to fifth preferred combination modes.

[0165] Alternatives to the fourth and fifth preferred combinations: the first plane, the second plane, the third plane and the fourth plane are replaced by the fourth plane, the third plane, the second plane and the first plane respectively; the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 are replaced by the fourth air nozzle 14, the third air nozzle 13, the second air nozzle 12 and the first air nozzle 11 respectively; the first roller group, the second roller group, the third roller group and the fourth roller group are replaced by the fourth roller 24, the third roller 23, the second roller group and the first roller group respectively. That is, when the structure of the oven remains unchanged, the pole piece 6 flows in the opposite direction in the same flow path, the pole piece outlet of the oven becomes the pole piece inlet, and the pole piece inlet becomes the pole piece outlet, such as: in the fifth preferred combination, the pole piece 6 flows into the oven from the upper left after being coated by the first coating assembly 71 and flows out of the oven from the lower left. After replacement, the pole piece 6 flows into the oven from the lower left after being coated by the first coating assembly 71 and flows out of the oven from the upper left.

[0166] A preferred embodiment of the nozzle: please refer to Figure 6 The first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 are each provided with a supporting roller 15 whose axis is perpendicular to the first direction. By arranging a supporting roller 15 in each of the first air nozzle 11 and the second air nozzle 12, the pole piece 6 is prevented from being attached to the first air nozzle 11 or the second air nozzle 12 during the flow process, thereby ensuring the normal blowing out of the hot air. At the same time, when the roller corresponds to the interval between two adjacent air nozzles, the first air nozzle group, the second air nozzle group, the third air nozzle group and / or the fourth air nozzle group can be driven to move up and down, so that the air nozzle is inserted into the interval between two adjacent rollers, and the pole piece 6 flows in a serpentine shape, thereby increasing the length of the pole piece 6 that can be accommodated in the oven. For example, in the fifth preferred combination, the first roller 21 corresponds to the interval between two adjacent first air nozzles 11, and the first air nozzle group is driven to move downward, and the first air nozzle 11 enters the interval between two adjacent first rollers 21. In this way, the pole piece 6 is bent downward under the push of multiple supporting rollers 15, and the original straight flow is changed to a serpentine flow, and the flow path of the pole piece 6 becomes longer, thereby increasing the length of the pole piece 6 that can be accommodated in the oven.

[0167] Specifically, the oven is also provided with a circulating fan, a heating package, a circulating air duct, a return air port, a fresh air port and an exhaust port; the circulating fan and the heating package are arranged in the circulating air duct; the return air port is arranged at the input end of the circulating air duct; the exhaust port is close to the return air port; the fresh air port is arranged between the exhaust port and the circulating fan; the output end of the circulating fan is connected to the input end of the heating package, and the output end of the circulating air duct is connected to the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14. The circulating air duct can circulate gas through the return air port, the fresh air port and the exhaust port, the air is heated into hot air by the heating package, and the hot air is driven to flow to the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 by the circulating fan, and the hot air flows out from the first air nozzle 11, the second air nozzle 12, the third air nozzle 13 and the fourth air nozzle 14 to act on the electrode 6, and take away the solvent of the electrode 6.

[0168] Specifically: The oven is also provided with a shell for accommodating the nozzle group and the roller group, and the shell provides a closed space to prevent heat from diffusing outward, reduce heat loss, and improve drying efficiency. Figure 7 As shown, the oven is provided with an upper shell 51 and a lower shell 52, the first air nozzle group, the second air nozzle group, and the first roller group are arranged in the upper shell 51, and the third air nozzle group, the fourth air nozzle group, the second roller group and the third roller group are arranged in the lower shell 52.

[0169] Preferably: the oven is also provided with a correction unit for moving the pole piece 6 back to the correct flow path. The pole piece 6 is prone to deflection when turning. If the pole piece 6 deflects, it cannot be aligned with the air nozzle, thereby affecting the drying efficiency and drying effect. In order to avoid this situation, a correction unit is provided at the position where the pole piece 6 needs to turn. The correction unit is provided with a photoelectric sensor, a reflection tube and a correction actuator. A reflector is provided in the reflection tube. The reflection tube is passed through the shell of the oven, one end of which is located outside the shell and the other end is located inside the shell. The photoelectric sensor is provided outside the shell, and the correction actuator is provided inside the shell. The detection light emitted by the photoelectric sensor is reflected by the reflector in the reflection tube and enters the shell, thereby realizing the detection of the displacement of the pole piece 610. When the photoelectric sensor detects that the pole piece 6 is deflected, a correction signal is sent to the correction actuator. After receiving the correction signal, the correction actuator moves the pole piece 6 back to the correct flow path.

[0170] Embodiment 2

[0171] A drying method provided in an embodiment of the present invention comprises:

[0172] 10. The pole piece 6 is driven by the roller group to flow with the first drying surface facing the first air nozzle 11;

[0173] Specifically, the upper peripheral surfaces of the plurality of first rollers 21 support the pole pieces 6 to flow rightward with the first surface to be baked facing upward.

[0174] 20. Drying the first surface to be dried by using the first air nozzle group;

[0175] Specifically, the plurality of first air nozzles 11 of the first air nozzle group blow hot air downward to dry the upward first surface to be dried.

[0176] 30. Adjust the flow direction of the electrode 6 so that the first surface to be dried faces the second air nozzle 12;

[0177] Specifically, the pole piece 6 flowing through the first rightmost roller 21 is guided by the first reversing roller 31 to turn downward first and then to the left, and the first surface to be dried changes from facing upward to facing downward.

[0178] 40. The pole piece 6 is driven to flow by the N roller groups, and the first drying surface is dried by the second air nozzle group;

[0179] Specifically, the lower circumferences of the plurality of first rollers 21 support the pole piece 6 to flow leftward with the first surface to be dried facing downward. During the flow of the pole piece 6 to the leftward, the plurality of second air nozzles 12 blow hot air upward to dry the first surface to be dried facing downward.

[0180] 50. Adjust the flow direction of the electrode piece 6 so that the second surface to be dried of the electrode piece 6 faces the third air nozzle 13;

[0181] Specifically, the pole piece 6 flowing to the left is first guided by the first redirecting roller 41 to flow downward and enter the second coating assembly 72 for coating. The pole piece flowing out of the second coating assembly 72 is guided to flow to the right by the third redirecting roller 33, so that the second surface of the pole piece 6 to be dried faces downward.

[0182] 60. The pole piece 6 is driven to flow by the N roller groups, and the second surface to be dried is dried by the third air nozzle group;

[0183] Specifically, the lower circumferences of the plurality of second rollers 22 support the pole piece 6 to flow rightward with the second surface to be dried facing downward. During the flow of the pole piece 6 to the right, the plurality of third air nozzles 13 blow hot air upward to dry the second surface to be dried facing downward.

[0184] 70. Adjust the flow direction of the electrode piece 6 so that the second surface to be dried of the electrode piece 6 faces the fourth air nozzle 14;

[0185] Specifically, the pole piece 6 flowing rightward is first guided to flow downward by the second direction-changing roller 42, and then the pole piece 6 flowing downward is guided to flow leftward by the third direction-changing roller 43, so that the second surface to be dried of the pole piece 6 faces upward.

[0186] 80. The pole piece 6 is driven to flow by the N roller groups, and the second surface to be dried is dried by the fourth air nozzle group.

[0187] Specifically, the upper surfaces of the plurality of fourth rollers 24 support the pole piece 6 to flow leftward with the second surface to be dried facing upward. During the flow of the pole piece 6 to the leftward, the plurality of fourth air nozzles 14 blow hot air downward to dry the upward second surface to be dried.

[0188] It should be noted that this embodiment is described by taking the oven using the fifth preferred combination in Embodiment 1 as an example.

[0189] The drying method can be implemented by any of the ovens provided in Example 1, that is, the drying method adopts all the technical solutions in Example 1, and therefore has at least the beneficial effects brought by the technical solutions in Example 1, which will not be described one by one here.

[0190] Embodiment 3

[0191] A coating machine provided in an embodiment of the present invention is provided with an oven. The specific structure of the oven refers to that of Embodiment 1. Since the coating machine adopts all the technical solutions of Embodiment 1, it has at least the beneficial effects brought by the technical solutions of Embodiment 1, which will not be described one by one here.

[0192] It should be noted that the coating machine is provided with a first coating component 71 and a second coating component 72. The wet slurry is first coated on one surface of the pole piece 6 by the first coating component 71 to form a first surface to be dried, and then the first surface to be dried is dried once and twice in sequence by the first nozzle group and the second nozzle group. Then, the wet slurry is coated on the other surface of the pole piece 6 by the second coating component 72 to form a second surface to be dried. Finally, the second surface to be dried is dried once and twice in sequence by the third nozzle group and the fourth nozzle group.

[0193] Embodiment 4

[0194] A coating system provided in an embodiment of the present invention is provided with a coating machine and a winding and unwinding device. The specific structure of the coating machine refers to Example 1. Since the coating system adopts all the technical solutions of Example 1, it has at least the beneficial effects brought by the technical solutions of Example 1, which will not be described one by one here.

[0195] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0196] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oven, characterized in that: include: A first nozzle group, a second nozzle group, a third nozzle group, a fourth nozzle group and N roller groups, 2≤N≤4, a first coating assembly, and a second coating assembly; The first air nozzle group includes A first air nozzles located in a first plane, and the A first air nozzles are arranged at intervals along a first direction; The second air nozzle group includes B second air nozzles located in the second plane, and the B second air nozzles are arranged at intervals along the first direction; The third air nozzle group includes C third air nozzles located in a third plane, and the C third air nozzles are arranged at intervals along the first direction; The fourth air nozzle group includes D fourth air nozzles located in a fourth plane, and the D fourth air nozzles are arranged at intervals along the first direction; The first plane, the second plane, the third plane and the fourth plane are parallel to each other, and A, B, C and D are all integers greater than or equal to 1; The lengths of projections of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction are less than the sum of the lengths of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group in the first direction; The N roller groups include a first roller group and a second roller group; the first roller group is arranged between the first nozzle group and the second nozzle group, and the second roller group is arranged between the third nozzle group and the fourth nozzle group; the first coating assembly and the second coating assembly are located on the same side of the oven body, and the first coating assembly is arranged in front of the first roller group, and the second coating assembly is arranged between the first roller group and the second roller group; The first roller group is used to support the pole piece to flow through the first nozzle group and the second nozzle group in sequence, and the second roller group is used to support the pole piece to flow through the third nozzle group and the fourth nozzle group in sequence, so that when the pole piece passes through the first nozzle group, the first surface to be dried of the pole piece faces the first nozzle, when passing through the second nozzle group, the first surface to be dried faces the second nozzle, when passing through the third nozzle group, the second surface to be dried of the pole piece faces the third nozzle, and when passing through the fourth nozzle group, the second surface to be dried faces the fourth nozzle; The first roller group is provided with a first reversing roller and multiple first rollers whose axes are in the same plane, and the first reversing roller is used to adjust the flow direction of the pole piece so that the first surface to be dried changes from facing the first air nozzle to facing the second air nozzle, and / or, the second roller group is provided with a second reversing roller and multiple second rollers whose axes are in the same plane, and the second reversing roller is used to adjust the flow direction of the pole piece so that the second surface to be dried changes from facing the third air nozzle to facing the fourth air nozzle.

2. An oven according to claim 1, characterized in that: The first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group are aligned in a direction perpendicular to the first direction.

3. The oven according to claim 1, characterized in that: The second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane; The wind directions of the first air nozzle and the second air nozzle are opposite to each other, and the wind directions of the third air nozzle and the fourth air nozzle are opposite to each other.

4. An oven according to claim 3, characterized in that: The multiple first rollers in the first roller group are specifically a first rollers, the axes of the a first rollers and the first reversing roller are in the fifth plane, the a first rollers and the first reversing roller are arranged in parallel and spaced apart in sequence, the axes of the first rollers are perpendicular to the first direction, and a is an integer greater than 1; The multiple second rollers in the second roller group are specifically b second rollers, the axes of the b second rollers and the second reversing roller are in a sixth plane, the b second rollers and the second reversing roller are arranged in parallel and spaced apart in sequence, the axes of the second rollers are perpendicular to the first direction, and b is an integer greater than 1; The first plane, the fifth plane and the sixth plane are parallel to each other.

5. An oven according to claim 4, characterized in that: The first roller group is further provided with a first direction-changing roller for guiding the pole piece to flow from the first roller to the second roller; The second roller group is further provided with a second direction-changing roller and a third direction-changing roller for guiding the pole piece to flow out from the second roller.

6. An oven according to claim 4 or 5, characterized in that: The first air nozzle corresponds to the second air nozzle in one-to-one correspondence, and the third air nozzle corresponds to the fourth air nozzle in one-to-one correspondence; The first roller corresponds to the first air nozzle, and the second roller corresponds to the third air nozzle; Alternatively, the first roller corresponds to the interval between two adjacent first air nozzles, and the second roller corresponds to the interval between two adjacent third air nozzles.

7. The oven according to claim 1, characterized in that: The first plane and the second plane are located between the third plane and the fourth plane, and the first plane is close to the fourth plane; The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite; The N roller groups include a first roller group, a second roller group and a third roller group; The first roller group is arranged between the first plane and the second plane, the second roller group is arranged between the second plane and the third plane, and the third roller group is arranged between the first plane and the fourth plane.

8. The oven according to claim 1, characterized in that: The second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane; The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite; The N roller groups include a first roller group, a second roller group and a third roller group; The first roller group is arranged between the first plane and the second plane, the second roller group is arranged between the second plane and the third plane, and the third roller group is arranged on a side of the fourth plane away from the third plane.

9. An oven according to claim 7 or 8, characterized in that: The first roller group includes a first reversing roller whose axis is located in a fifth plane and a first rollers, the a first rollers and the first reversing rollers are sequentially arranged in parallel and spaced apart from each other, the axis of the first roller is perpendicular to the first direction, and a is an integer greater than 1; The second roller group includes b second rollers whose axes are located in the sixth plane, the b second rollers are arranged in parallel and spaced apart in sequence, the axes of the second rollers are perpendicular to the first direction, and b is an integer greater than 1; The third roller group comprises c third rollers whose axes are located in the seventh plane, the c third rollers are arranged in parallel and spaced apart in sequence, the axes of the third rollers are perpendicular to the first direction, and c is an integer greater than 1; The first reversing roller is used to adjust the flow direction of the pole piece; The first plane, the fifth plane, the sixth plane and the seventh plane are parallel to each other.

10. An oven according to claim 9, characterized in that: The first air nozzle corresponds to the second air nozzle in one-to-one correspondence, and the third air nozzle corresponds to the fourth air nozzle in one-to-one correspondence; The first roller corresponds to the first air nozzle, the second roller corresponds to the third air nozzle, and the third roller corresponds to the fourth air nozzle; Alternatively, the first roller corresponds to the interval between two adjacent first air nozzles, the second roller corresponds to the interval between two adjacent third air nozzles, and the third roller corresponds to the interval between two adjacent fourth air nozzles.

11. An oven according to claim 7 or 8, characterized in that: The first plane, the second plane, the third plane and the fourth plane are replaced by the fourth plane, the third plane, the second plane and the first plane respectively; The first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are replaced by the fourth air nozzle, the third air nozzle, the second air nozzle and the first air nozzle respectively; The first roller group and the third roller group are replaced by the third roller group and the first roller group respectively.

12. The oven according to claim 1, characterized in that: The first plane and the second plane are located between the third plane and the fourth plane, and the first plane is close to the fourth plane; The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite; The N roller groups include a first roller group, a second roller group, a third roller group and a fourth roller group; The first roller group and the second roller group are arranged between the first plane and the second plane, and the first roller group is close to the first plane; The third roller group is arranged between the second plane and the third plane, and the fourth roller group is arranged between the first plane and the fourth plane.

13. The oven according to claim 1, characterized in that: The second plane and the third plane are located between the first plane and the fourth plane, and the second plane is close to the first plane; The wind directions of the first air nozzle and the second air nozzle are opposite, and the wind directions of the third air nozzle and the fourth air nozzle are opposite; The N roller groups include a first roller group, a second roller group, a third roller group and a fourth roller group; The first roller group and the second roller group are arranged between the first plane and the second plane, and the first roller group is close to the first plane; The third roller group is arranged between the second plane and the third plane; The fourth plane is arranged between the fourth roller set and the third plane.

14. An oven according to claim 12 or 13, characterized in that: The first roller group includes a first rollers whose axes are located in the fifth plane, the a first rollers are arranged in parallel and spaced apart in sequence, and the axes of the first rollers are perpendicular to the first direction; The second roller group comprises b second rollers whose axes are located in the sixth plane, the b second rollers are arranged in parallel and spaced apart in sequence, and the axes of the second rollers are perpendicular to the first direction; The third roller group comprises c third rollers whose axes are located in the seventh plane, the c third rollers are arranged in parallel and spaced apart in sequence, and the axes of the third rollers are perpendicular to the first direction; The fourth roller group comprises d fourth rollers whose axes are located in the eighth plane, the d fourth rollers are arranged in parallel and spaced apart in sequence, and the axes of the fourth rollers are perpendicular to the first direction; a, b, c and d are all integers greater than 1; The first plane, the fifth plane, the sixth plane, the seventh plane and the eighth plane are parallel to each other.

15. An oven according to claim 14, characterized in that: The first air nozzle corresponds to the second air nozzle in one-to-one correspondence, and the third air nozzle corresponds to the fourth air nozzle in one-to-one correspondence; The first roller corresponds to the first air nozzle, the second roller corresponds to the second air nozzle, the third roller corresponds to the third air nozzle, and the fourth roller corresponds to the fourth air nozzle; Or, the first roller corresponds to the interval between two adjacent first air nozzles, the second roller corresponds to the interval between two adjacent second air nozzles, the third roller corresponds to the interval between two adjacent third air nozzles, and the fourth roller corresponds to the interval between two adjacent fourth air nozzles.

16. An oven according to claim 12 or 13, characterized in that: The first plane, the second plane, the third plane and the fourth plane are replaced by the fourth plane, the third plane, the second plane and the first plane respectively; The first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are replaced by the fourth air nozzle, the third air nozzle, the second air nozzle and the first air nozzle respectively; The first roller group, the second roller group, the third roller group and the fourth roller group are replaced by the fourth roller, the third roller, the second roller group and the first roller group respectively.

17. The oven according to claim 1, characterized in that: The first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are each provided with a supporting roller whose axis is perpendicular to the first direction.

18. The oven according to claim 1, characterized in that: Also includes: Circulation fan, heating pack, circulation duct, return air inlet, fresh air inlet and exhaust air outlet; The circulating fan and the heating pack are arranged in the circulating air duct; The return air port is arranged at the input end of the circulating air duct; The air outlet is close to the air return outlet; The fresh air inlet is arranged between the exhaust outlet and the circulation fan; The output end of the circulation fan is connected to the input end of the heating bag, and the output end of the circulation air duct is connected to the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle.

19. The oven according to claim 1, characterized in that: Also includes: A correction unit is used to move the pole piece back to the correct flow path.

20. A drying method, characterized in that: The method is implemented by using the oven according to any one of claims 1 to 19, comprising: Applying slurry on the first surface of the electrode to be dried; The pole piece is driven by the roller group to flow with the first to-be-dried surface facing the first air nozzle; Drying the first surface to be dried by a first air nozzle group; Adjust the flow direction of the electrode piece so that the first surface to be dried faces the second air nozzle; The pole piece is driven to flow by the N roller groups, and the first surface to be dried is dried by the second air nozzle group; When the electrode piece moves to the same side position as the first surface to be dried where the slurry is applied, the slurry is applied to the second surface to be dried of the electrode piece; Adjust the flow direction of the electrode piece so that the second surface to be dried of the electrode piece faces the third air nozzle; The pole piece is driven to flow by the N roller groups, and the second surface to be dried is dried by the third air nozzle group; Adjust the flow direction of the electrode piece so that the second surface to be dried of the electrode piece faces the fourth air nozzle; The pole piece is driven to flow by the N roller groups, and the second surface to be dried is dried by the fourth air nozzle group.

21. A coating machine, characterized in that: include: An oven as claimed in any one of claims 1 to 19.

22. A coating system, characterized in that: include: A coating machine and a winding and unwinding device as described in claim 21.

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