Pole piece drying device and battery production system

Abstract

The utility model relates to the technical field of battery production, in particular to a pole piece drying device and a battery production system. The pole piece drying device comprises a supporting assembly and an air outlet assembly, a drying channel used for conveying pole pieces in the first direction is formed in the supporting assembly, the air outlet assembly is connected with the supporting assembly and arranged on at least one side of the drying channel in the second direction, and the air outlet assembly comprises a first air outlet nozzle and a second air outlet nozzle; the first air outlet nozzle is used for conveying airflow towards a main body area of the pole piece in the direction intersecting with the first direction, the second air outlet nozzle is used for conveying airflow towards a tab area of the pole piece in the direction intersecting with the first direction, and the first direction intersects with the second direction. According to the pole piece drying device, the curing speed of the main body area and the curing speed of the pole lug area can be the same or basically the same by adjusting the conveying airflow of the main body area and the conveying airflow of the pole lug area respectively, and then virtual edges are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and particularly relates to an electrode tab drying device and a battery production system. BACKGROUND

[0002] When manufacturing a lithium ion battery, according to process requirements, the wet electrode tab after coating needs to be dried through an oven to produce an electrode tab with a specified thickness and uniform coating uniformity, and therefore the drying process plays a crucial role in the production of the electrode tab. However, in the drying process of the electrode tab, the solidification speed of the main body area and the tab area of the electrode tab is different, which can easily lead to the formation of a virtual edge at the connection between the main body area and the tab area, thereby reducing the solidification quality of the electrode tab. CONTENT OF THE UTILITY MODEL

[0003] In view of the defects in the prior art, the purpose of the present application is to provide an electrode tab drying device and a battery production system, which can effectively solve the problem of different solidification speeds of the main body area and the tab area of the electrode tab.

[0004] The first aspect of the present application discloses an electrode tab drying device, which comprises:

[0005] A support assembly, which forms a drying channel for conveying the electrode tab along a first direction;

[0006] An air outlet assembly, which is connected to the support assembly and is arranged on at least one side of the drying channel along a second direction, the air outlet assembly comprises a first air outlet nozzle and a second air outlet nozzle, the first air outlet nozzle is used to convey air flow towards the main body area of the electrode tab along a direction intersecting the first direction, and the second air outlet nozzle is used to convey air flow towards the tab area of the electrode tab along a direction intersecting the first direction, wherein the first direction intersects the second direction.

[0007] According to the electrode tab drying device of the present application, in the drying process of the electrode tab, air flow is conveyed towards the main body area through the first air outlet nozzle, and air flow is conveyed towards the tab area through the second air outlet nozzle, so that air flow can be conveyed to and dried in the main body area and the tab area respectively. By adjusting the air flow conveyed to the main body area and the tab area respectively, the solidification speed of the main body area and the tab area is the same or substantially the same, thereby reducing the generation of virtual edges.

[0008] In some embodiments of the present application, the first air outlet nozzle and the second air outlet nozzle are connected in a manner capable of relative movement along the second direction.

[0009] By moving the first air outlet nozzle relative to the second air outlet nozzle along the second direction, the distance between the first air outlet nozzle and the pole piece along the second direction can be adjusted, so as to increase or decrease the drying speed of the first air outlet nozzle on the main body area, so that the solidification speeds of the main body area and the tab area are the same or substantially the same. Alternatively, by moving the second air outlet nozzle relative to the first air outlet nozzle along the second direction, the distance between the second air outlet nozzle and the pole piece along the second direction can be adjusted, so as to increase or decrease the drying speed of the second air outlet nozzle on the tab area, so that the solidification speeds of the main body area and the tab area are the same or substantially the same.

[0010] In some embodiments of the present application, the first air outlet nozzle and the second air outlet nozzle are detachably connected.

[0011] According to the coating condition of the surface of the pole piece, the drying can be selectively performed on the main body area or the tab area. When the main body area needs to be dried only, the second air outlet nozzle can be removed, and the main body area is dried by the airflow delivered by the first air outlet nozzle only; when the tab area needs to be dried only, the first air outlet nozzle can be removed, and the tab area is dried by the airflow delivered by the second air outlet nozzle only.

[0012] In some embodiments of the present application, the first air outlet nozzle and the second air outlet nozzle are respectively connected with the same gas source; or the first air outlet nozzle and the second air outlet nozzle are respectively connected with different gas sources.

[0013] By connecting the first air outlet nozzle and the second air outlet nozzle with the same gas source respectively, the drying speeds on the main body area and the tab area can be respectively adjusted by respectively adjusting the distances between the first air outlet nozzle and the second air outlet nozzle and the pole piece along the second direction, and the number of gas sources can be reduced, and the cost can be reduced. By connecting the first air outlet nozzle and the second air outlet nozzle with different gas sources respectively, the air speeds or air quantities of different gas sources can be respectively controlled, so as to adjust the air quantities and air speeds of the first air outlet nozzle and the second air outlet nozzle, and then respectively adjust the drying speeds on the main body area and the tab area.

[0014] In some embodiments of the present application, the first air outlet nozzle comprises a first air outlet, and the second air outlet nozzle comprises a second air outlet, and the distance dimension from the first air outlet to the pole piece is equal to or different from the distance dimension from the second air outlet to the pole piece along the second direction.

[0015] By setting the distance dimension from the first air outlet to the pole piece equal to the distance dimension from the second air outlet to the pole piece, the air speeds and air quantities of different air outlets can be respectively adjusted to respectively adjust the drying speeds on the main body area and the tab area. By setting the distance dimension from the first air outlet to the pole piece different from the distance dimension from the second air outlet to the pole piece, the time when the air flow of the first air outlet reaches the pole piece is different from the time when the air flow of the second air outlet reaches the pole piece, so that the solidification speeds of the main body area and the tab area are the same or substantially the same.

[0016] In some embodiments of the present application, the number of the first air outlets is multiple, and the air outlet directions of at least part of the first air outlets are the same or different; and / or, the number of the second air outlets is multiple, and the air outlet directions of at least part of the second air outlets are the same or different.

[0017] According to the surface coating condition of the main body area, the air outlet directions of at least part of the first air outlets can be set to be the same or different, so as to improve the drying speed of the main body area. According to the surface coating condition of the tab area, the air outlet directions of at least part of the second air outlets can be set to be the same or different, so as to improve the drying speed of the tab area.

[0018] In some embodiments of the present application, the air volume of the first air outlet is less than that of the second air outlet; and / or, the air speed of the first air outlet is less than that of the second air outlet.

[0019] Since the solidification rate of the main body area is generally greater than that of the tab area, under the same conditions, the solidification time of the main body area is less than that of the tab area. By setting the air volume of the first air outlet to be less than that of the second air outlet, the solidification time of the main body area can be prolonged, so that the solidification speeds of the main body area and the tab area are the same or substantially the same, thereby reducing the generation of virtual edges. By setting the air speed of the first air outlet to be less than that of the second air outlet, the solidification time of the main body area can be prolonged, so that the solidification speeds of the main body area and the tab area are the same or substantially the same, thereby reducing the generation of virtual edges.

[0020] In some embodiments of the present application, the drying channel is provided with air outlet assemblies on both sides along the second direction, and the air outlet assembly on one side is arranged to be staggered with the air outlet assembly on the other side along the first direction.

[0021] By respectively guiding the air flow along the second direction towards the pole piece through the air outlet assemblies on both sides, a more uniform flow layer can be formed on the surfaces of the pole piece on both sides along the second direction, so that the heat acting on the surface of the pole piece is more uniform, and local overheating or overcooling of the surface of the pole piece is avoided, and the deformation of the pole piece caused by uneven heating is reduced. At the same time, by arranging the air outlet assemblies on both sides to be staggered along the first direction, the area of the air flow acting on the surface of the pole piece can be increased, the drying efficiency can be improved, and the deformation of some areas of the pole piece caused by direct collision of the air flow can be reduced, and the drying effect of the pole piece can be improved.

[0022] In some embodiments of the present application, the support assembly comprises an oven, and the inside of the oven is provided with a first hull and a second hull spaced apart along the second direction, and the first hull and the second hull form a drying channel therebetween, and at least one of the first hull and the second hull is provided with an air outlet assembly.

[0023] By setting the oven, the pole piece can pass through the drying channel in the oven, and the pole piece in the drying channel is heated by the oven. The air flow of the air outlet assembly acts on the surface of the pole piece, so as to achieve the rapid curing of the pole piece.

[0024] In some embodiments of the present application, the pole piece drying device further comprises a conveying assembly for conveying the pole piece in the first direction.

[0025] By conveying the pole piece in the first direction by the conveying assembly, the pole piece can continuously move in the first direction in the drying channel, so that the pole piece is continuously dried by the pole piece drying device.

[0026] In some embodiments of the present application, the pole piece drying device further comprises a support roller rotatably arranged in the drying channel and used for supporting and conveying the pole piece, and at least part of the number of air outlet assemblies is arranged above the support roller.

[0027] By arranging the support roller in the drying channel and arranging at least part of the number of air outlet assemblies above the support roller, the air outlet assembly is used to convey the air flow in the direction towards the support roller for drying the surface of the pole piece away from the support roller. When the pole piece is deformed in the direction towards the support roller under the action of the air flow or its own gravity, it can abut against the support roller and be supported and conveyed by the support roller, thereby reducing the damage caused by the friction between the pole piece and other components during movement.

[0028] The second aspect of the present application also proposes a battery production system, which comprises the pole piece drying device of any one of the above.

[0029] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0030] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered limiting the present application. Moreover, the same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0031] Figure 1 is a front structure schematic view of the pole piece drying device and the pole piece provided by an embodiment of the present application;

[0032] Figure 2 is Figure 1 is a side structure schematic view of part of the pole piece drying device and the pole piece in

[0033] Figure 3 is Figure 2 is a schematic view of the relative position structure of the air outlet assembly of the pole piece drying device and the pole piece in the pole piece drying device.

[0034] Figure 4 is Figure 3 is a schematic view of the structure of the air outlet assembly.

[0035] The reference signs in the detailed description are as follows:

[0036] 100, pole piece drying device;

[0037] 10, support assembly; 11, oven; 12, first hull; 13, second hull; 101, drying channel; 102, opening;

[0038] 20, air outlet assembly; 21, first air outlet nozzle; 211, first shell; 212, first air outlet; 213, first chamfer; 22, second air outlet nozzle; 221, second shell; 222, second air outlet; 223, second chamfer; 23, connecting piece;

[0039] 30, support roller;

[0040] 200, pole piece; 201, current collector; 2011, main body area; 2012, tab area; 202, positive electrode paste; 203, tab adhesive;

[0041] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0042] The embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0043] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0045] In addition, the technical terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0046] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, fire power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. Lithium ion battery has been widely used in mobile and portable electric appliances due to its high energy density, high average open circuit voltage and long cycle life.

[0049] In the manufacture of lithium ion batteries, according to the process requirements, the wet electrode sheet after coating needs to be dried in an oven to produce an electrode sheet with a specified thickness and uniform coating uniformity, so the drying process plays a crucial role in the production of the electrode sheet. However, during the drying process of the electrode sheet, due to the different solidification speeds of the main body area and the tab area of the electrode sheet, a virtual edge is easily formed at the connection between the main body area and the tab area, thereby reducing the solidification quality of the electrode sheet.

[0050] To solve the problem of different solidification speeds of the main body area and the tab area of the electrode sheet, the present application provides an electrode sheet drying device and a battery production system with the same. According to the electrode sheet drying device and the battery production system of the present application, the gas flow can be respectively conveyed to the main body area and the tab area for drying. By respectively adjusting the gas flow conveyed to the main body area and the tab area, the solidification speeds of the main body area and the tab area are made the same or substantially the same, thereby reducing the generation of virtual edges.

[0051] The electrode sheet drying device in the present application is mainly used for drying the cathode electrode sheet after coating. The cathode electrode sheet before coating includes a current collector, which includes a main body area and a tab area. The surface of the main body area is coated with black positive electrode paste, and the surface of the tab area is coated with white tab adhesive. The solid content of the white tab adhesive is less than that of the black positive electrode paste. The solid content refers to the percentage of the volume or mass of solid particles in the suspension to the volume or mass of the entire suspension. Compared with the black positive electrode paste, the white tab adhesive has low viscosity and strong fluidity, and the drying speed is slower than that of the black positive electrode paste. Therefore, under the same drying conditions, the solidification speed of the white tab adhesive is slow, and part of the white tab adhesive is easily moved to the surface of the main body area during the drying process. When the tab is finally solidified, a white linear object (i.e., a virtual edge) without obvious boundary will be formed at the connection between the main body area and the tab area. The existence of the virtual edge will cause problems in the later image margin acquisition and affect the shearing of the electrode sheet. Therefore, it is necessary to reduce the generation of the virtual edge. To this end, the present application provides an electrode sheet drying device and a battery production system. The electrode sheet drying device in the present application can be used not only for drying the cathode electrode sheet, but also for drying the anode electrode sheet. For the convenience of description, the electrode sheet drying device is exemplified by drying the cathode electrode sheet.

[0052] In combination Figures 1 to 4As shown, the first aspect of the present application discloses an electrode sheet drying device 100, in some embodiments of the present application, the electrode sheet drying device 100 comprises a support assembly 10 and an air outlet assembly 20, the support assembly 10 is formed with a drying channel 101 for conveying the electrode sheet 200 along a first direction X, the air outlet assembly 20 is connected with the support assembly 10 and is arranged at least one side of the drying channel 101 along a second direction Y, the air outlet assembly 20 comprises a first air outlet nozzle 21 and a second air outlet nozzle 22, the first air outlet nozzle 21 is used for conveying airflow towards the main body area 2011 of the electrode sheet 200 along a direction intersecting the first direction X, the second air outlet nozzle 22 is used for conveying airflow towards the tab area 2012 of the electrode sheet 200 along a direction intersecting the first direction X, wherein the first direction X intersects the second direction Y.

[0053] Specifically, the support assembly 10 can be a frame structure or a box structure, and the drying channel 101 is formed in the interior of the support assembly 10. The electrode sheet 200 can be arranged in the drying channel 101 and move in the drying channel 101 along the first direction X, so that the surface of the electrode sheet 200 in the first direction X is dried through the drying channel 101. Wherein, the electrode sheet 200 before coating comprises a current collector 201, the current collector 201 comprises a main body area 2011 and a tab area 2012, the main body area 2011 is in a substantially rectangular structure, comprising a length direction and a width direction, the size of the main body area 2011 along the length direction is greater than the size along the width direction, and the tab area 2012 is protrudingly arranged at least one side of the main body area 2011 along the width direction. Wherein, the first direction X can be consistent with the length direction of the main body area 2011. The current collector 201 can be an aluminum foil, the surface of the main body area 2011 is coated with positive paste 202, the surface of the tab area 2012 is coated with tab adhesive 203, and the color of the positive paste 202 is different from that of the tab adhesive 203, and a boundary line is formed between the two.

[0054] The air outlet assembly 20 is connected with the support assembly 10 and is arranged at least one side of the drying channel 101 along the second direction Y, so that the airflow can be delivered to the coated pole piece 200 along the second direction Y. In the present application, the pole piece 200 refers to the coated pole piece 200 unless otherwise specified. The second direction Y intersects the first direction X. Optionally, the first direction X can be consistent with the length direction of the main body area 2011, and the second direction Y is perpendicular to the surface of the main body area 2011. When the surface of the pole piece 200 is arranged in the horizontal direction, the second direction Y can be the vertical direction. The air outlet assembly 20 includes the first air outlet nozzle 21 and the second air outlet nozzle 22. The number of the first air outlet nozzle 21 can be one or more, and the first air outlet nozzle 21 is used to deliver the airflow to the main body area 2011 of the pole piece 200 along the direction intersecting the first direction X. Optionally, the first air outlet nozzle 21 can deliver the airflow to the main body area 2011 along the second direction Y, or the first air outlet nozzle 21 can deliver the airflow to the main body area 2011 along the direction intersecting the second direction Y at an angle of 0° to 90°. The number of the second air outlet nozzle 22 can be one or more, and the second air outlet nozzle 22 is used to deliver the airflow to the tab area 2012 of the pole piece 200 along the direction intersecting the first direction X. Optionally, the second air outlet nozzle 22 can deliver the airflow to the tab area 2012 along the second direction Y, or the second air outlet nozzle 22 can deliver the airflow to the tab area 2012 along the direction intersecting the second direction Y at an angle of 0° to 90°. The air speed, air volume or spacing dimension between one of the first air outlet nozzle 21 and the second air outlet nozzle 22 and the pole piece 200 along the second direction Y is different from the other. That is, the air speed of the first air outlet nozzle 21 is different from the air speed of the second air outlet nozzle 22, or the air volume of the first air outlet nozzle 21 is different from the air volume of the second air outlet nozzle 22, or the spacing dimension between the first air outlet nozzle 21 and the pole piece 200 along the second direction Y is different from the spacing dimension between the second air outlet nozzle 22 and the pole piece 200 along the second direction Y.

[0055] According to the pole piece drying device 100 of the present application, during the drying process of the pole piece 200, the airflow is delivered to the main body area 2011 by the first air outlet nozzle 21 and the airflow is delivered to the tab area 2012 by the second air outlet nozzle 22, so that the main body area 2011 and the tab area 2012 can be dried by delivering the airflow respectively. By adjusting the airflow delivered to the main body area 2011 and the tab area 2012 respectively, the solidification speed of the main body area 2011 and the tab area 2012 can be the same or substantially the same, thereby reducing the generation of the virtual edge.

[0056] In combination Figures 1 to 4 As shown in some embodiments of the present application, the first air outlet nozzle 21 and the second air outlet nozzle 22 are connected in a manner capable of relative movement along the second direction Y.

[0057] Specifically, the first air outlet 21 comprises a first shell 211, and the second air outlet 22 comprises a second shell 221. The first shell 211 and the second shell 221 are connected in a manner that they can move relative to each other along the second direction Y. Optionally, the first shell 211 is connected to the second shell 221 through a connecting member 23, and at least one of the first shell 211 and the second shell 221 is connected to the connecting member 23 in a manner that it can move along the second direction Y. Alternatively, the first shell 211 and the second shell 221 are directly connected, and at least one of the first shell 211 and the second shell 221 can move relative to the other along the second direction Y.

[0058] By moving the first air outlet 21 relative to the second air outlet 22 along the second direction Y, the distance between the first air outlet 21 and the pole piece 200 along the second direction Y can be adjusted, so as to increase or decrease the drying speed of the first air outlet 21 on the main body area 2011, so that the solidification speeds of the main body area 2011 and the tab area 2012 are the same or substantially the same. Alternatively, by moving the second air outlet 22 relative to the first air outlet 21 along the second direction Y, the distance between the second air outlet 22 and the pole piece 200 along the second direction Y can be adjusted, so as to increase or decrease the drying speed of the second air outlet 22 on the tab area 2012, so that the solidification speeds of the main body area 2011 and the tab area 2012 are the same or substantially the same.

[0059] In combination Figures 1 to 4 As shown, in some embodiments of the present application, the first air outlet 21 and the second air outlet 22 are connected in a detachable manner.

[0060] Specifically, the first air outlet 21 comprises a first shell 211, and the second air outlet 22 comprises a second shell 221. The first shell 211 and the second shell 221 are connected in a manner that they can move relative to each other along the second direction Y. Optionally, the first shell 211 is connected to the second shell 221 through a connecting member 23, and at least one of the first shell 211 and the second shell 221 is connected to the connecting member 23 in a manner that it can move along the second direction Y. Alternatively, the first shell 211 and the second shell 221 are directly connected, and at least one of the first shell 211 and the second shell 221 can move relative to the other along the second direction Y.

[0061] According to the coating condition of the surface of the pole piece 200, the drying can be selectively performed only on the main body area 2011 or the tab area 2012. When the main body area 2011 needs to be dried only, the second air outlet 22 can be detached, and the airflow is delivered to the main body area 2011 through the first air outlet 21 only, and the main body area 2011 is dried. When the tab area 2012 needs to be dried only, the first air outlet 21 can be detached, and the airflow is delivered to the tab area 2012 through the second air outlet 22 only, and the tab area 2012 is dried.

[0062] In combination Figures 1 to 3As shown, in some embodiments of the present application, the first air outlet 21 and the second air outlet 22 are respectively connected to the same air source (not shown in the figure); or, the first air outlet 21 and the second air outlet 22 are respectively connected to different air sources.

[0063] Specifically, the pole piece drying device 100 further comprises a first air source, the first air source being connected to the first air outlet 21 and the second air outlet 22 respectively, so as to respectively deliver air flow to the first air outlet 21 and the second air outlet 22 through the first air source. Alternatively, the pole piece drying device 100 further comprises a first air source and a second air source, the first air source being connected to the first air outlet 21, and the second air source being connected to the second air outlet 22. Wherein, the air speed of the first air source and the second air source is different, and / or the air volume of the first air source and the second air source is different.

[0064] Connecting the first air outlet 21 and the second air outlet 22 to the same air source respectively can adjust the drying speed of the main body area 2011 and the tab area 2012 respectively by adjusting the distance between the first air outlet 21 and the second air outlet 22 and the pole piece 200 along the second direction Y, and can reduce the number of air sources and reduce the cost. Connecting the first air outlet 21 and the second air outlet 22 to different air sources respectively can control the air speed or air volume of different air sources respectively, so as to adjust the air volume and air speed of the first air outlet 21 and the second air outlet 22 respectively, and then adjust the drying speed of the main body area 2011 and the tab area 2012 respectively.

[0065] In combination with Figures 1 to 4 As shown, in some embodiments of the present application, the first air outlet 21 comprises a first air outlet 212, and the second air outlet 22 comprises a second air outlet 222, the distance from the first air outlet 212 to the pole piece 200 along the second direction Y is equal to or not equal to the distance from the second air outlet 222 to the pole piece 200 along the second direction Y.

[0066] Specifically, the first air outlet nozzle 21 includes a first shell 211, a surface of the first shell 211 is formed with a first air outlet 212, and an inner portion of the first shell 211 is further formed with a first air duct for connecting the air source and the first air outlet 212, so that the airflow supplied by the air source can act on the surface of the main body area 2011 through the first air outlet 212, so as to dry the surface of the main body area 2011. The second air outlet nozzle 22 includes a second shell 221, a surface of the second shell 221 is formed with a second air outlet 222, and an inner portion of the second shell 221 is further formed with a second air duct for connecting the air source and the second air outlet 222, so that the airflow supplied by the air source can act on the surface of the tab area 2012 through the second air outlet 222, so as to dry the surface of the tab area 2012. Wherein, along the second direction Y, the distance dimension from the first air outlet 212 to the main body area 2011 is equal to the distance dimension from the second air outlet 222 to the tab area 2012. Alternatively, along the second direction Y, the distance dimension from the first air outlet 212 to the main body area 2011 is not equal to the distance dimension from the second air outlet 222 to the tab area 2012.

[0067] By setting the distance dimension from the first air outlet 212 to the pole piece 200 to be equal to the distance dimension from the second air outlet 222 to the pole piece 200, the drying speed of the main body area 2011 and the tab area 2012 can be adjusted respectively by adjusting the air outlet speed and the air outlet amount of different air outlets respectively. By setting the distance dimension from the first air outlet 212 to the pole piece 200 to be not equal to the distance dimension from the second air outlet 222 to the pole piece 200, the time when the airflow of the first air outlet 212 reaches the pole piece 200 is different from the time when the airflow of the second air outlet 222 reaches the pole piece 200, so that the solidification speeds of the main body area 2011 and the tab area 2012 are the same or substantially the same.

[0068] In combination Figures 1 to 4 As shown in the drawings, in some embodiments of the present application, the number of the first air outlets 212 is multiple, and the air outlet directions of at least part of the number of the first air outlets 212 are the same or different; and / or, the number of the second air outlets 222 is multiple, and the air outlet directions of at least part of the number of the second air outlets 222 are the same or different.

[0069] Specifically, the first air outlet nozzle 21 includes multiple first air outlets 212, and the air outlet directions of the multiple first air outlets 212 can be arranged along the same direction, such as the air outlet directions of the multiple first air outlets 212 are arranged along the second direction Y respectively. Alternatively, such as Figure 3 As shown in the drawings, Figure 3The direction of the arrows between the dark colors is the air outlet direction. Among them, the air outlet direction of the first air outlet 212 at the middle position of the plurality of first air outlets 212 is arranged along the second direction Y, and the first air outlets 212 on both sides of the middle position along the third direction Z are arranged at an angle with the second direction Y, so that the air flow of the first air outlet 21 acts on the surface of the pole piece 200 in different directions, reduces the deformation of the pole piece 200 caused by the same direction of the air flow, and makes the heating of the pole piece 200 more uniform, and improves the solidification speed of the pole piece 200. The second air outlet 22 includes a plurality of second air outlets 222, and the air outlet directions of the plurality of second air outlets 222 can be arranged in the same direction, such as the air outlet directions of the plurality of second air outlets 222 arranged along the second direction Y. Or, as shown in Figure 3 the air outlet direction of the second air outlet 222 at the middle position of the plurality of second air outlets 222 is arranged along the second direction Y, and the second air outlets 222 on both sides of the middle position along the third direction Z are arranged at an angle with the second direction Y, so that the air flow of the second air outlet 22 acts on the surface of the pole piece 200 in different directions, reduces the deformation of the pole piece 200 caused by the same direction of the air flow, and makes the heating of the pole piece 200 more uniform, and improves the solidification speed of the pole piece 200. Among them, the third direction Z is perpendicular to the first direction X and the second direction Y, and when the first direction X is consistent with the length direction of the pole piece 200, the third direction Z can be the width direction of the pole piece 200.

[0070] According to the surface coating condition of the main body area 2011, the air outlet directions of at least part of the number of first air outlets 212 can be arranged to be the same or different, thereby improving the drying speed of the main body area 2011. According to the surface coating condition of the tab area 2012, the air outlet directions of at least part of the number of second air outlets 222 can be arranged to be the same or different, thereby improving the drying speed of the tab area 2012.

[0071] In combination with Figures 1 to 4 as shown, in some embodiments of the present application, the air volume of the first air outlet 212 is less than that of the second air outlet 222; and / or, the air speed of the first air outlet 212 is less than that of the second air outlet 222.

[0072] Specifically, when the opening areas of the first air outlet 212 and the second air outlet 222 are the same, the air flow speed of the first air outlet 212 can be set to be less than the air flow speed of the second air outlet 222, so that the air volume of the first air outlet 212 is less than the air volume of the second air outlet 222. Alternatively, when the air flow speed of the first air outlet 212 is the same as the air flow speed of the second air outlet 222, the opening area of the first air outlet 212 can be set to be less than the opening area of the second air outlet 222, so that the air volume of the first air outlet 212 is less than the air volume of the second air outlet 222.

[0073] When the opening areas of the first air outlet 212 and the second air outlet 222 are the same, the gas supply amount of the first air outlet 212 can be set to be less than the gas supply amount of the second air outlet 222, so that the air flow speed of the first air outlet 212 is less than the air flow speed of the second air outlet 222. Alternatively, when the gas supply amount of the first air outlet 212 is the same as the gas supply amount of the second air outlet 222, the opening area of the first air outlet 212 can be set to be greater than the opening area of the second air outlet 222, so that the air flow speed of the first air outlet 212 is less than the air flow speed of the second air outlet 222.

[0074] Since the solidification rate of the main body area 2011 is generally greater than the solidification rate of the tab area 2012, under the same conditions, the solidification time of the main body area 2011 is less than the solidification time of the tab area 2012. By setting the air volume of the first air outlet 212 to be less than the air volume of the second air outlet 222, the solidification time of the main body area 2011 can be prolonged, and finally the solidification speeds of the main body area 2011 and the tab area 2012 are the same or substantially the same, thereby reducing the generation of virtual edges. By setting the air flow speed of the first air outlet 212 to be less than the air flow speed of the second air outlet 222, the solidification time of the main body area 2011 can be prolonged, and finally the solidification speeds of the main body area 2011 and the tab area 2012 are the same or substantially the same, thereby reducing the generation of virtual edges.

[0075] In combination Figures 1 to 4 As shown in the drawings, in some embodiments of the present application, the first housing 211 is provided with a first chamfer 213 on both side edges in the first direction X, thereby reducing the scratching of the edge of the first housing 211 during the movement of the tab sheet 200 in the first direction X, and reducing the damage of the tab sheet 200. The second housing 221 is provided with a second chamfer 223 on both side edges in the first direction X, thereby reducing the scratching of the edge of the second housing 221 during the movement of the tab sheet 200 in the first direction X, and reducing the damage of the tab sheet 200.

[0076] In combination Figures 1 to 3As shown, in some embodiments of the present application, the drying channel 101 is provided with air outlet assemblies 20 on both sides along the second direction Y, and the air outlet assembly 20 on one side is staggered with the air outlet assembly 20 on the other side along the first direction X.

[0077] Specifically, the drying channel 101 is provided with air outlet assemblies 20 on both sides along the second direction Y, and the pole piece 200 is arranged between the air outlet assemblies 20 on both sides along the second direction Y during the drying process, so that the air outlet assemblies 20 are used to blow and dry the two sides of the pole piece 200 respectively. And the air outlet assembly 20 on one side is staggered with the air outlet assembly 20 on the other side along the first direction Y, that is, the air outlet assembly 20 on one side is not arranged opposite to the air outlet assembly 20 on the other side along the second direction Y.

[0078] By using the air outlet assemblies 20 on both sides to respectively send airflow to the pole piece 200 along the second direction Y, a more uniform flow layer of the airflow can be formed on the surfaces of the pole piece 200 along the second direction Y, the heat acting on the surface of the pole piece 200 is increased, local overheating or overcooling of the surface of the pole piece 200 is avoided, deformation of the pole piece 200 caused by uneven heating is reduced, and by staggering the air outlet assemblies 20 on both sides along the first direction X, the area of the airflow acting on the surface of the pole piece 200 is increased, the drying efficiency is improved, and deformation of some areas of the pole piece 200 caused by direct collision of the airflow is reduced, and the drying effect of the pole piece 200 is improved.

[0079] In combination with Figures 1 to 4 As shown, in some embodiments of the present application, the support assembly 10 includes an oven 11, and the inside of the oven 11 is provided with a first hull 12 and a second hull 13 spaced apart along the second direction Y, and the first hull 12 and the second hull 13 form a drying channel 101 therebetween, and at least one of the first hull 12 and the second hull 13 is provided with an air outlet assembly 20.

[0080] Specifically, the oven 11 is a generally box-shaped structure, and an accommodation cavity is formed in the inside of the oven 11, and the first hull 12 and the second hull 13 are arranged in the accommodation cavity spaced apart along the second direction Y, and the drying channel 101 is formed between the first hull 12 and the second hull 13. Optionally, the oven 11 is provided with openings 102 at both ends along the first direction X, the pole piece 200 can extend into the drying channel 101 through one of the openings 102, and extend out of the oven 11 through the other opening 102, so that the pole piece 200 can move along the first direction X and solidify in the drying channel 101. Optionally, the first hull 12 and the second hull 13 are respectively provided with air outlet assemblies 20, and the air outlet assembly 20 of the first hull 12 is staggered with the air outlet assembly 20 of the second hull 13 along the first direction X. Optionally, the inside of the oven 11 is further provided with a heating member, so that the temperature in the oven 11 is increased by the heating member to quickly dry the pole piece 200.

[0081] By setting the oven 11, the pole piece 200 can pass through the drying channel 101 in the oven 11, and the pole piece 200 in the drying channel 101 is heated by the oven 11. The air flow of the air outlet assembly 20 acts on the surface of the pole piece 200, so as to achieve rapid curing of the pole piece 200.

[0082] In combination Figures 1 to 4 As shown in the drawings, in some embodiments of the present application, the pole piece drying device 100 further comprises a conveying assembly (not shown in the drawings), which is used to convey the pole piece 200 along the first direction X.

[0083] Specifically, the conveying assembly can be arranged outside the oven 11 and comprises a first conveying roller and a second conveying roller. The first conveying roller is arranged on one side of the oven 11 along the first direction X, and the second conveying roller is arranged on the other side of the oven 11 along the first direction X. The pole piece 200 is arranged at both ends of the oven 11 along the first direction X and is drivingly connected with the first conveying roller and the second conveying roller respectively, so that the pole piece 200 moves in the drying channel 101 along the first direction X.

[0084] By conveying the pole piece 200 along the first direction X by the conveying assembly, the pole piece 200 can continuously move in the drying channel 101 along the first direction X, so that the pole piece 200 is continuously dried by the pole piece drying device 100.

[0085] In combination Figures 1 to 3 As shown in the drawings, in some embodiments of the present application, the pole piece drying device 100 further comprises a support roller 30, which is arranged in the drying channel 101 in a rotatable manner and is used to support and convey the pole piece 200. At least part of the number of air outlet assemblies 20 is arranged above the support roller 30.

[0086] Specifically, the support roller 30 is arranged on one side of the pole piece 200 along the second direction Y. The axial direction of the support roller 30 is consistent with the third direction Z, and the support roller 30 can rotate around the third direction Z. At least part of the number of air outlet assemblies 20 is arranged on the other side of the pole piece 200 along the second direction Y, so that the pole piece 200 is supported and conveyed by the support roller 30, and the surface of the pole piece 200 away from the support roller 30 is dried by the air outlet assembly 20. Optionally, the support roller 30 is arranged on the second hull 13, and part of the number of air outlet assemblies 20 is arranged on the first hull 12, and the first hull 12 is arranged above the second hull 13. Optionally, on the basis of arranging part of the number of air outlet assemblies 20 on the first hull 12, the air outlet assembly 20 can also be arranged on the second hull 13, so that the pole piece 200 is dried by the air outlet assemblies 20 on both sides. The top of the support roller 30 is arranged above the top of the air outlet assembly 20 on the second hull 13.

[0087] By arranging the support rollers 30 in the drying channel 101 and arranging at least part of the air outlet assemblies 20 above the support rollers 30, the air outlet assemblies 20 are used to deliver the airflow in a direction towards the support rollers 30 for drying the surface of the pole piece 200 away from the support rollers 30, and when the pole piece 200 is deformed in the direction of the support rollers 30 under the action of the airflow or its own gravity, it can abut and be supported and delivered by the support rollers 30, thereby reducing damage caused by friction between the pole piece 200 and other components during movement.

[0088] The second aspect of the present application also provides a battery production system, which comprises the pole piece drying device 100 of any of the above embodiments.

[0089] Since the battery production system in the present application comprises the pole piece drying device 100 in any of the above embodiments, it has the same technical features as the pole piece drying device 100 in any of the above embodiments and can achieve the same technical effects, which will not be repeated here.

[0090] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0091] In combination Figures 1 to 4 As shown in the drawings, in some embodiments of the present application, the pole piece drying device 100 comprises a support assembly 10 and an air outlet assembly 20. The support assembly 10 comprises an oven 11, and the inside of the oven 11 is spaced apart in a second direction Y to form a first hull 12 and a second hull 13, and a drying channel 101 for delivering the pole piece 200 in a first direction X is formed between the first hull 12 and the second hull 13. The first hull 12 and the second hull 13 are respectively provided with the air outlet assembly 20, and the air outlet assembly 20 of the first hull 12 and the air outlet assembly 20 of the second hull 13 are arranged in a staggered manner in the first direction X. The air outlet assembly 20 comprises a first air outlet nozzle 21 and a second air outlet nozzle 22, the first air outlet nozzle 21 is used to deliver the airflow in a direction intersecting the first direction X towards the main body area 2011 of the pole piece 200, and the second air outlet nozzle 22 is used to deliver the airflow in a direction intersecting the first direction X towards the tab area 2012 of the pole piece 200, wherein the first direction X is consistent with the length direction of the pole piece 200, and the second direction Y intersects the first direction X.

[0092] The first air outlet nozzle 21 and the second air outlet nozzle 22 are detachably connected and can move relative to each other along the second direction Y. The first air outlet nozzle 21 and the second air outlet nozzle 22 are respectively connected to different air sources. The first air outlet nozzle 21 includes a first air outlet 212, and the second air outlet nozzle 22 includes a second air outlet 222. The distance from the first air outlet 212 to the pole piece 200 is different from the distance from the second air outlet 222 to the pole piece 200 along the second direction Y. The number of the first air outlets 212 is plural, and the air outlet directions of at least part of the first air outlets 212 are different. The number of the second air outlets 222 is plural, and the air outlet directions of at least part of the second air outlets 222 are different. The air outlet amount of the first air outlet 212 is less than the air outlet amount of the second air outlet 222. The air outlet speed of the first air outlet 212 is less than the air outlet speed of the second air outlet 222.

[0093] The pole piece drying device 100 further includes a conveying assembly for conveying the pole piece 200 along the first direction X. The pole piece drying device 100 further includes a support roller 30 rotatably arranged in the drying channel 101 and used for supporting and conveying the pole piece 200.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode sheet drying device characterized by comprising: include: A support assembly having a drying channel for conveying electrode sheets along a first direction; An air outlet assembly is connected to the support assembly and disposed on at least one side of the drying channel along a second direction. The air outlet assembly includes a first air outlet and a second air outlet. The first air outlet is used to deliver airflow toward the main body area of ​​the electrode sheet along a direction intersecting with the first direction. The second air outlet is used to deliver airflow toward the tab area of ​​the electrode sheet along a direction intersecting with the first direction. The first direction intersects with the second direction.

2. The pole piece drying apparatus according to claim 1, characterized by The first air outlet and the second air outlet are connected in a manner that allows them to move relative to each other along the second direction.

3. The pole piece drying apparatus of claim 1, wherein The first air outlet and the second air outlet are connected in a detachable manner.

4. The pole piece drying apparatus of claim 1, wherein The first air outlet and the second air outlet are respectively connected to the same air source; or, the first air outlet and the second air outlet are respectively connected to different air sources.

5. The pole piece drying apparatus of claim 1, wherein The first air outlet includes a first air outlet, and the second air outlet includes a second air outlet. Along the second direction, the distance from the first air outlet to the electrode is equal to or different from the distance from the second air outlet to the electrode.

6. The pole piece drying apparatus of claim 5, wherein The number of first air outlets is multiple, and at least a portion of the first air outlets have the same or different air outlet directions; and / or, the number of second air outlets is multiple, and at least a portion of the second air outlets have the same or different air outlet directions.

7. The pole piece drying apparatus of claim 5, wherein The air volume of the first air outlet is less than the air volume of the second air outlet; and / or, the air velocity of the first air outlet is less than the air velocity of the second air outlet.

8. The pole piece drying apparatus according to any one of claims 1 to 7, characterized by, The drying channel is provided with air outlet components on both sides along the second direction, and the air outlet component on one side is offset from the air outlet component on the other side along the first direction.

9. The pole piece drying apparatus according to any one of claims 1 to 7, characterized by, The support assembly includes an oven, in which a first hull and a second hull are spaced apart along the second direction inside the oven, and a drying channel is formed between the first hull and the second hull. At least one of the first hull and the second hull is provided with the air outlet assembly.

10. The pole piece drying apparatus according to any one of claims 1 to 7, characterized by, The electrode drying apparatus further includes a conveying assembly for conveying the electrode along the first direction.

11. The pole piece drying apparatus according to any one of claims 1 to 7, characterized by, The electrode drying device further includes a support roller, which is rotatably disposed within the drying channel and is used to support and transport the electrode. At least a portion of the air outlet components are disposed above the support roller.

12. A battery production system characterized by comprising: The electrode drying apparatus includes any one of claims 1 to 11.

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