Pole piece baking device and coating machine

Abstract

The utility model provides a pole piece baking device and a coating machine. The pole piece baking device comprises a first ship body, a second ship body, a first fresh air channel and a second fresh air channel, and the first ship body and the second ship body are oppositely arranged; the first fresh air channel communicates with the first ship body to convey airflow to the first ship body, the second fresh air channel communicates with the second ship body to convey airflow to the second ship body, and the temperature of the airflow blown out by the first ship body can be different from that of the airflow blown out by the second ship body. In the application, the first fresh air channel and the second fresh air channel do not communicate with each other, so that airflow with different temperatures can be conveniently conveyed to the first ship body and the second ship body; the temperature of the air flow blown out of the first ship body can be inconsistent with the temperature of the air flow blown out of the second ship body, the isotropy of moisture migration can be made into scale guidance during baking, the baking effect from top to bottom or from bottom to top is achieved, and the bonding strength with the pole piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery processing equipment, and in particular to a pole piece baking device and a coating machine. Background Art

[0002] When making batteries, the baking quality of the electrode has an important impact on the performance of the battery. At present, upper and lower air nozzles are usually used to bake the electrodes coated with slurry. Since the air blown out by the upper and lower air nozzles is at the same temperature, the corresponding upper surface wind directly acts on the surface slurry, while the lower surface wind first acts on the electrode and then is transferred to the bottom slurry through the electrode. It cannot ensure that the slurry is gradually dried from the bottom layer to the surface. There is a risk of cracking and peeling of the slurry due to the surface drying first, which makes the bonding strength and surface quality consistency of the slurry on the electrode surface poor. Utility Model Content

[0003] The present application provides an electrode baking device and a coating machine that are beneficial to improving the bonding strength and surface quality consistency of electrode surface slurry.

[0004] In a first aspect, an embodiment of the present application provides an electrode baking device, which includes a first hull, a second hull, a first fresh air channel and a second fresh air channel, and the first hull and the second hull are arranged opposite to each other; the first fresh air channel is connected to the first hull to convey airflow to the first hull, and the second fresh air channel is connected to the second hull to convey airflow to the second hull, and the temperature of the airflow blown out by the first hull can be different from the temperature of the airflow blown out by the second hull.

[0005] According to the first aspect, in a possible implementation manner, a difference between a temperature of the airflow blown out of the first hull and a temperature of the airflow blown out of the second hull is ΔT, 0<│ΔT│≤50°C.

[0006] According to the first aspect, in a possible implementation, the electrode baking device also includes a heat exchanger, which is arranged in the first fresh air channel or the second fresh air channel, and the heat exchanger is used to heat or cool the airflow flowing through the first fresh air channel or the second fresh air channel.

[0007] According to the first aspect, in a possible implementation, the heat exchanger is disposed at a connection point between the first hull and the first fresh air channel; and / or the heat exchanger is disposed at a connection point between the second hull and the second fresh air channel.

[0008] According to the first aspect, in a possible implementation, the pole piece baking device further includes a baking box, and the first hull and the second hull are both arranged in the baking box; the pole piece baking device further includes an exhaust duct, and the exhaust duct is connected to the baking box.

[0009] According to the first aspect, in a possible implementation, the electrode baking device includes a waste heat recovery component, the waste heat recovery component is connected to the exhaust duct, and the waste heat recovery component exchanges heat with the first fresh air channel and / or the second fresh air channel.

[0010] According to the first aspect, in a possible implementation, the exhaust duct includes an air return section and an exhaust section, the air return section is connected to the baking oven, the waste heat recovery component has a first channel and a second channel that are not connected to each other, the first channel connects the air return section and the exhaust section, and the second channel connects the first fresh air channel and / or the second fresh air channel.

[0011] According to the first aspect, in a possible implementation method, the waste heat recovery component includes a first waste heat recovery component and a second waste heat recovery component, the first waste heat recovery component exchanges heat with the first fresh air channel, and the second waste heat recovery component exchanges heat with the second fresh air channel; the return air section has a first recovery port and a second recovery port, the first recovery port is connected to the first waste heat recovery component, and the second recovery port is connected to the second waste heat recovery component, and an adjusting component is provided between the first recovery port and the second recovery port, and the adjusting component is used to adjust the air flow rate flowing to the first recovery port and the second recovery port.

[0012] According to the first aspect, in a possible implementation, the adjusting member includes a driving member and a distribution plate, the distribution plate is arranged between the first recovery port and the second recovery port, the distribution plate is rotationally connected to the return air section, the output end of the driving member is transmission-connected to the distribution plate, and the driving member is used to drive the distribution plate to rotate to adjust the air flow rate flowing to the first recovery port and the second recovery port.

[0013] According to the first aspect, in a possible implementation, the baking device includes a first fresh air duct, a first air inlet box and a first air uniforming box, the first fresh air duct, the first air inlet box and the first air uniforming box are connected in sequence to form the first fresh air channel, the first air inlet box and the first air uniforming box are adjacent to each other along a first direction; the baking box is connected to the first air uniforming box along a second direction; the second direction is not parallel to the first direction.

[0014] According to the first aspect, in a possible implementation manner, a filter is provided in the first fresh air channel and / or the second fresh air channel.

[0015] In a second aspect, an embodiment of the present application further provides a coating machine, comprising a coating device and a pole piece baking device according to the first aspect, wherein the coating device is used to coat slurry on the surface of the pole piece, and the pole piece baking device is used to dry the slurry on the pole piece.

[0016] According to the second aspect, in a possible implementation, the coating device is used to coat a first slurry layer on the surface of the pole piece, and coat a second slurry layer on the surface of the first slurry layer, and the concentration of the first slurry layer is greater than the concentration of the second slurry layer.

[0017] The present application provides a pole piece baking device and a coating machine. In the pole piece baking device, the temperature of the air flow blown out of the first hull can be inconsistent with the temperature of the air flow blown out of the second hull. The isotropic migration of moisture can be guided on a large scale during baking, achieving a baking effect from top to bottom or from bottom to top, thereby improving the bonding strength with the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural schematic diagram of a pole piece baking device in the first embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the location of the heat exchanger in the first embodiment of the present application;

[0021] Figure 3 yes Figure 2 A magnified schematic diagram of the middle A area;

[0022] Figure 4 It is a structural schematic diagram of a pole piece baking device in the second embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the location of the waste heat recovery component in the second embodiment of the present application;

[0024] Figure 6 yes Figure 5 A schematic cross-sectional structure diagram of ;

[0025] Figure 7 It is a structural schematic diagram of the electrode baking device from another perspective in the second embodiment of the present application.

[0026] Reference numerals:

[0027] 100-electrode baking device; 11-first hull; 12-second hull; 20-first fresh air channel; 21-first fresh air pipeline; 22-first air inlet box; 23-first uniform air box; 30-second fresh air channel; 31-second fresh air pipeline; 32-second air inlet box; 33-second uniform air box; 40-baking box; 50-exhaust duct; 51-return air section; 52-exhaust section; 61-heat exchanger; 62-connecting pipe; 63-fan; 64-waste heat recovery component; 641-first channel; 642-second channel; 64a-first waste heat recovery component; 64b-second waste heat recovery component; 70-adjusting component; 71-driving component; 72-distribution plate; 81-partition; 811-air hole; 82-filter; 200-electrode. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0031] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] The present application discloses a coating machine, which includes a coating device and a pole piece baking device, wherein the coating device is used to coat the slurry on the surface of the pole piece, and the pole piece baking device is used to dry the slurry on the pole piece. After the slurry is dried, an active material layer attached to the pole piece is formed. For lithium batteries, the positive electrode slurry includes products such as lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate and ternary materials, the conductive agent mainly includes carbon black, carbon nanotubes, conductive graphite, etc., the binder is divided into water-based and oil-based binders, and the corresponding solvents include water-based deionized water and oil-based NMP solvent. The negative electrode slurry is made by mixing multiphase substances such as active substances, conductive agents, binders, thickeners and solvent deionized water. The negative electrode active substances are mainly various types of graphite and silicon-carbon negative electrodes. The conductive agents and positive electrode conductive agents are similar in type (carbon black, CNT, VGCF, etc.). At present, the negative electrode binder on the market generally selects environmentally friendly water-based binders such as CMC, SBR, LA132, etc. When lithium titanate is used as the negative electrode material, oil-based PVDF is generally selected as the binder, and NMP is used as the solvent.

[0033] It can be understood that the coating machine can also be applied to lead-acid batteries, nickel-metal hydride batteries and fuel cells, and it is only necessary to adjust the slurry according to the different types of batteries.

[0034] In some embodiments, the coating device is used to coat the surface of the pole piece with a first slurry layer, and coat the surface of the first slurry layer with a second slurry layer, and the concentration of the first slurry layer is greater than that of the second slurry layer. That is, two slurries of different concentrations are stored in the coating device, and the slurry with high concentration forms the first slurry layer on the surface of the pole piece, and the slurry with low concentration forms the second slurry layer on the first slurry layer. The concentration difference between the first slurry layer and the second slurry layer is used to drive and improve the bonding strength between the slurry and the pole piece, and the isotropy of the macroscopic changes during the baking process can also be regulated. That is, during baking, due to the concentration difference between the first slurry layer and the second slurry layer, the water tends to move upward, achieving a baking effect from bottom to top. Avoid the situation where the slurry surface is dried, but the part in contact with the pole piece is still not dried. Reduce the risk of cracking and peeling of the active material layer caused by drying the surface layer first, and improve the bonding strength and surface quality consistency of the active material layer on the electrode surface.

[0035] The coating device may adopt a double-layer coating device commonly used in the art, for example, a first spray channel and a second spray channel are opened on the coating nozzle, the slurry concentration stored in the first feeding module is higher than the slurry concentration stored in the second feeding module, the first feeding module supplies slurry to the first spray channel, and the second feeding module supplies slurry to the second spray channel. As the pole piece moves, the first spray channel coats the first slurry layer on the pole piece, and at the same time, the second spray channel coats the second slurry layer on the first slurry layer. The structure of the coating device is not described in detail in this application.

[0036] See also Figure 1 The electrode baking device 100 includes a first hull 11, a second hull 12, a first fresh air channel 20, a second fresh air channel 30, a baking oven 40 and an exhaust duct 50. The first hull 11 and the second hull 12 are both arranged in the baking oven 40, and the first hull 11 and the second hull 12 are arranged opposite to each other. The first fresh air channel 20 is connected with the first hull 11 to convey airflow to the first hull 11, and the second fresh air channel 30 is connected with the second hull 12 to convey airflow to the second hull 12. The electrode 200 coated with the first slurry layer and the second slurry layer is placed between the first hull 11 and the second hull 12. The first hull 11 and the second hull 12 convey airflow toward the electrode 200 to dry the first slurry layer and the second slurry layer on the electrode 200. The exhaust duct 50 is connected with the baking oven 40 to facilitate the timely discharge of the baking airflow.

[0037] Compared with the traditional method in which one fresh air channel simultaneously delivers airflow to the first hull 11 and the second hull 12, in this embodiment, the first fresh air channel 20 and the second fresh air channel 30 are independent of each other, and the first fresh air channel 20 and the second fresh air channel 30 can deliver airflows of different temperatures. And the temperature of the airflow blown out by the first hull 11 can be different from the temperature of the airflow blown out by the second hull 12. For the convenience of description, the first hull 11 is located on the side of the pole piece 200 where the slurry is coated, and the second hull 12 is located on the side of the pole piece 200 away from the slurry. The temperature of the airflow blown out by the first hull 11 is inconsistent with the temperature of the airflow blown out by the second hull 12, which can guide the isotropic migration of moisture during baking, achieve a baking effect from top to bottom or from bottom to top, and at the same time, improve the bonding strength.

[0038] Depending on the different solvents in the slurry, the temperature of the airflow blown out of the first hull 11 can be set to be greater than the temperature of the airflow blown out of the second hull 12, or the temperature of the airflow blown out of the first hull 11 can be set to be less than the temperature of the airflow blown out of the second hull 12.

[0039] Specifically, the temperature difference between the temperature of the airflow blown out of the first hull 11 and the temperature of the airflow blown out of the second hull 12 is △T, 0<│△T│≤50° C. Avoid excessive temperature difference between the temperature of the airflow blown out of the first hull 11 and the temperature of the airflow blown out of the second hull 12, which may cause uneven drying of the slurry on the pole piece 200.

[0040] In order to make the temperature of the airflow blown out of the first hull 11 inconsistent with the temperature of the airflow blown out of the second hull 12 , the present application proposes the following implementation.

[0041] In the first embodiment, see Figures 1 to 3The electrode baking device 100 further includes a heat exchanger 61, which can be arranged in the first fresh air channel 20. A heat exchange channel can be formed in the heat exchanger 61, and the heat exchange channel is connected to the circulation loop through the connecting pipe 62. A heat exchange medium flows in the circulation loop, and the airflow can exchange heat with the heat exchange medium in the heat exchanger 61 when passing through the heat exchanger. Corresponding hydraulic components can be arranged in series on the circulation loop to make the temperature of the heat exchange medium flowing through the heat exchanger 61 lower than the temperature of the airflow, so that the temperature of the airflow blown out of the first hull 11 is lower than the temperature of the airflow blown out of the second hull 12. A heater can also be arranged on the circulation loop to make the temperature of the heat exchange medium flowing through the heat exchanger 61 higher than the temperature of the airflow, so that the temperature of the airflow blown out of the first hull 11 is higher than the temperature of the airflow blown out of the second hull 12.

[0042] Based on the above embodiment, the electrode baking device 100 further includes a fan 63, which is fixed to the heat exchanger 61, and the air outlet side of the fan 63 faces the heat exchanger 61. The fan 63 blows air toward the heat exchanger 61, so that the airflow passes through the heat exchanger 61 for heat exchange. In addition, the fan 63 can provide kinetic energy for the airflow to compensate for the kinetic energy loss when the airflow passes through the heat exchanger 61. The heat exchanger 61 has a plurality of heat dissipation fins, and the fan 63 cooperates with the heat dissipation fins to further improve the heat exchange efficiency.

[0043] The heat exchanger 61 can be arranged at the connection point between the first fresh air channel 20 and the first hull 11. After the airflow exchanges heat with the heat exchanger 61, it directly enters the first hull 11, reducing the flow path of the airflow after heat exchange in the first fresh air channel 20, reducing outward radiation heat dissipation, and helping to reduce energy consumption.

[0044] In other embodiments, the heat exchanger 61 may also be disposed in the second fresh air passage 30, or in both the first fresh air passage 20 and the second fresh air passage 30. The heat exchanger 61 may also be disposed at any position in the first fresh air passage 20, and it is only necessary to provide a heat insulation layer outside the first fresh air passage 20 to reduce the heat loss when the airflow flows in the first fresh air passage 20.

[0045] In other embodiments, a heater, such as an electric heating wire, may be directly arranged in the first fresh air channel 20, and the heater is powered on to generate heat to heat the airflow passing through the first fresh air channel 20. The temperature of the airflow blown out of the first hull 11 is higher than the temperature of the airflow blown out of the second hull 12. A refrigerator, such as a semiconductor refrigerator, may also be arranged in the first fresh air channel 20, and the refrigerator is powered on to generate cold to cool the airflow passing through the first fresh air channel 20. The temperature of the airflow blown out of the first hull 11 is lower than the temperature of the airflow blown out of the second hull 12. Similar to the arrangement of the heat exchanger, a heater and a refrigerator may also be arranged in the second fresh air channel 30, and a fan 63 may be arranged to provide motion for the airflow.

[0046] In the second embodiment, see Figure 4 and Figure 5 The electrode baking device 100 also includes a waste heat recovery component 64, which is connected to the exhaust duct 50 and exchanges heat with the first fresh air channel 20. The first hull 11 and the second hull 12 continuously blow airflow toward the electrode 200. The airflow acts on the electrode 200 or the slurry on the electrode 200 and is discharged from the exhaust duct 50. The airflow in the exhaust duct 50 still has waste heat. In this embodiment, by setting a waste heat recovery component 64, heat exchange between the airflow in the exhaust duct 50 and the airflow in the first fresh air channel 20 is achieved, and the waste heat of the airflow in the exhaust duct 50 is utilized to improve the capacity utilization rate.

[0047] In some embodiments, see Figure 4 and Figure 6 The waste heat recovery member 64 has a first channel 641 and a second channel 642 which are not connected to each other. The first channel 641 is connected to the exhaust duct 50, and the second channel 642 is connected to the first fresh air duct 20. The airflow flowing through the first channel 641 and the airflow flowing through the second channel 642 can exchange heat, thereby utilizing the waste heat of the airflow in the exhaust duct 50.

[0048] The waste heat recovery member 64 includes a plurality of heat exchange tubes arranged at intervals, a first channel 641 is formed in the heat exchange tubes, and a second channel 642 is formed in the gaps between the heat exchange tubes. The heat exchange tubes are made of heat-conducting materials, such as aluminum tubes, copper tubes, etc. By arranging a plurality of heat exchange tubes at intervals, the heat exchange area can be increased. At the same time, the plurality of second channels 642 perform heat exchange simultaneously along the first direction, which can improve the uniformity of the temperature of the airflow flowing through the first fresh air channel 20.

[0049] In other embodiments, the waste heat recovery element 64 can be wrapped around the outside of the first fresh air passage 20 to achieve heat exchange, or the waste heat recovery element 64 can be extended into the first fresh air passage 20 to achieve heat exchange. The present application does not limit the heat exchange method of the waste heat recovery element 64.

[0050] In other embodiments, the waste heat recovery component 64 can exchange heat with the second fresh air passage 30 , and the waste heat recovery component 64 can also exchange heat with the first fresh air passage 20 and the second fresh air passage 30 at the same time.

[0051] When the waste heat recovery component 64 exchanges heat with the first fresh air passage 20 and the second fresh air passage 30 at the same time, the waste heat recovery component 64 is divided into a first waste heat recovery component 64a and a second waste heat recovery component 64b according to the corresponding relationship with the first fresh air passage 20 and the second fresh air passage 30. The first waste heat recovery component 64a exchanges heat with the first fresh air passage 20, and the second waste heat recovery component 64b exchanges heat with the second fresh air passage 30. Before the airflow in the first / second fresh air passage 30 is heated, the airflow temperature in the first / second fresh air passage 30 can be increased, thereby reducing the energy consumption required to heat the airflow in the first / second fresh air passage 30.

[0052] See also Figures 4 to 6 The exhaust duct 50 includes a return air section 51 and an exhaust section 52. The first channel 641 of the waste heat recovery member 64 connects the return air section 51 and the exhaust section 52, and the other end of the return air section 51 is connected to the oven 40. When the waste heat recovery member 64 exchanges heat with the first fresh air channel 20 and the second fresh air channel 30 at the same time, the end of the return air section 51 away from the oven 40 has a first recovery port and a second recovery port. The first recovery port is connected to the first channel 641 of the first waste heat recovery member 64a, and the second recovery port is connected to the first channel 641 of the second waste heat recovery member 64b. The return air section 51 has one inlet and two outlets, so that the airflow in the two fresh air channels (the first fresh air channel 20 and the second fresh air channel 30) can exchange heat with the airflow in the exhaust duct 50, and the waste heat of the airflow in the exhaust duct 50 is fully utilized.

[0053] In the case where the waste heat recovery component 64 is exchanging heat with the first fresh air channel 20 and the second fresh air channel 30 at the same time, the pole piece baking device 100 further includes an adjusting component 70, which can adjust the airflow rate flowing to the first recovery port and the second recovery port, that is, adjust the flow rate flowing into the first waste heat recovery component 64a and the flow rate flowing into the second waste heat recovery component 64b. It can be understood that the total airflow rate in the exhaust duct 50 is fixed. When the flow rate flowing to the first waste heat recovery component 64a is greater than the flow rate flowing to the second waste heat recovery component 64b, the airflow temperature in the first fresh air channel 20 after heat exchange with the first waste heat recovery component 64a is higher than the airflow temperature in the second fresh air channel 30 after heat exchange with the second waste heat recovery component 64b. And the greater the flow rate flowing to the first waste heat recovery component 64a, the smaller the flow rate flowing to the second waste heat recovery component 64b, and the greater the temperature difference between the air flow temperature after heat exchange with the first waste heat recovery component 64a in the first fresh air channel 20 and the air flow temperature after heat exchange with the second waste heat recovery component 64b in the second fresh air channel 30. On the contrary, when the flow rate flowing to the first waste heat recovery component 64a is less than the flow rate flowing to the second waste heat recovery component 64b, the air flow temperature after heat exchange with the first waste heat recovery component 64a in the first fresh air channel 20 is lower than the air flow temperature after heat exchange with the second waste heat recovery component 64b in the second fresh air channel 30, and the regulating component 70 can regulate the flow rate flowing to the first recovery port and the second recovery port to regulate the temperature difference between the air flow temperature flowing from the first fresh air channel 20 to the first hull 11 and the air flow temperature flowing from the second fresh air channel 30 to the second hull 12, and then regulate the temperature difference between the air flow blown out of the first hull 11 and the air flow blown out of the second hull 12.

[0054] The regulating member 70 may include a driving member 71 and a distribution plate 72, wherein the distribution plate 72 is disposed between the first recovery port and the second recovery port, and the distribution plate 72 is rotationally connected to the return air section 51, and the output end of the driving member 71 is transmission-connected to the distribution plate 72, and the driving member 71 can drive the distribution plate 72 to rotate to adjust the airflow to the first recovery port and the second recovery port. With the distribution plate 72 level as a reference, the airflow to the first recovery port and the airflow to the second recovery port are the same, and the airflow temperatures delivered by the first fresh air channel 20 and the second fresh air channel 30 tend to be consistent; when the distribution plate 72 rotates upward, a positive angle is formed, and the flow to the first recovery port is greater than the flow to the second recovery port, and the airflow temperature delivered by the first fresh air channel 20 is higher than the airflow temperature delivered by the second fresh air channel 30; when the distribution plate 72 rotates downward, a negative angle is formed, and the flow to the first recovery port is less than the flow to the second recovery port, and the airflow temperature delivered by the first fresh air channel 20 is lower than the airflow temperature delivered by the second fresh air channel 30.

[0055] The driving member 71 can be a motor, or other rotating driving member 71 or a linear driving member 71. When the driving member 71 is a linear driving member 71, the output end of the driving member 71 and the distribution plate 72 can be connected by a connecting rod and a gear rack structure.

[0056] In other embodiments, the regulating member 70 may also be a flow regulating valve, and the flow rate of the airflow to the first recovery port and the second recovery port may be adjusted by adjusting the opening of the flow regulating valve.

[0057] In the third embodiment, the temperatures of the air flows flowing to the first fresh air passage 20 and the air flows flowing to the second fresh air passage 30 are inconsistent.

[0058] It can be understood that, in the absence of conflict, the first embodiment, the second embodiment and the third embodiment can be combined with each other, for example, a heat exchanger 61 is provided in the first fresh air channel 20, and the heat exchanger 61 can cool the airflow in the first fresh air channel 20; and the exhaust duct 50 is connected with a first waste heat recovery component 64a and a second waste heat recovery component 64b, the first waste heat recovery component 64a exchanges heat with the first fresh air channel 20, and the second waste heat recovery component 64b exchanges heat with the second fresh air channel 30. Alternatively, the temperatures of the airflows flowing to the first fresh air channel 20 and the airflows flowing to the second fresh air channel 30 are inconsistent, and a heat exchanger 61 is provided in both the first fresh air channel 20 and the second fresh air channel 30, and the heat exchanger 61 can adjust the temperature difference between the airflow in the first fresh air channel 20 and the airflow in the second fresh air channel 30. This application is not limited to this.

[0059] See also Figure 4 and Figure 7 The baking device includes a first fresh air duct 21, a first air inlet box 22 and a first air equalizing box 23. The first fresh air duct 21, the first air inlet box 22 and the first air equalizing box 23 are connected in sequence to form the first fresh air channel 20. The first air inlet box 22 and the first air equalizing box 23 are arranged adjacent to each other along a first direction X. The baking box 40 is connected to the first air equalizing box 23 along a second direction Y. The second direction Y is not parallel to the first direction X. The first fresh air duct 21 can flow to the first air inlet box 22 from any direction. The direction from the first air inlet box 22 to the first air equalizing box 23 and the direction from the first air equalizing box 23 to the first hull 11 are not consistent. The airflow from the first air inlet box 22 to the first air equalizing box 23 will not directly enter the first hull 11, but will accumulate in the first air equalizing box 23 and then overflow to the first hull 11, so that the first hull 11 and the air outlet rate are more stable.

[0060] See also Figure 2 and Figure 7The first air inlet box 22 and the second air inlet box 32 are separated by a partition 81, and a plurality of air holes 811 are evenly distributed on the partition 81. The air holes 811 can disperse the airflow, making the airflow entering the air box softer and reducing the impact on the airflow blown out of the first hull 11.

[0061] See also Figure 4 and Figure 7 , a filter 82 is provided in the first fresh air channel 20, and the filter 82 can filter solid particles such as dust in the airflow to prevent the solid particles from blowing into the slurry through the first hull 11 and affecting the performance of the battery formed by the assembly of the pole piece 200. Specifically, the filter 82 can be made of common filter materials such as filter screens and activated carbon, or a combination of two or more filter materials. The filter 82 is provided on the air inlet side of the first fresh air channel 20, which can prevent dust accumulation in the first fresh air channel 20 and prevent the air hole 811 from being blocked.

[0062] Similar to the first fresh air passage 20, the second fresh air passage 30 may be formed by the second fresh air pipeline 31, the second air inlet box 32 and the second air uniforming box 33 being connected in sequence, the second air inlet box 32 and the second air uniforming box 33 being arranged adjacent to each other along the second direction Y; the baking oven 40 and the second air uniforming box 33 are connected along the second direction Y; the second direction Y is not parallel to the first direction X. The effects are the same as those described above, and will not be described one by one here.

[0063] It should be noted that the positions of the first hull 11 and the second hull 12 in the present application are only exemplified for the convenience of distinction. In actual applications, the first hull 11 can be located on the side of the pole piece 200 away from the slurry, and the second hull 12 can be located on the side of the pole piece 200 where the slurry is coated. The present application does not limit this.

[0064] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0065] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A pole piece baking device, characterized in that: The electrode baking device includes a first hull, a second hull, a first fresh air channel and a second fresh air channel, and the first hull and the second hull are arranged opposite to each other; the first fresh air channel is connected with the first hull to convey airflow to the first hull, and the second fresh air channel is connected with the second hull to convey airflow to the second hull, and the temperature of the airflow blown out by the first hull can be different from the temperature of the airflow blown out by the second hull.

2. The electrode baking device according to claim 1, characterized in that: The difference between the temperature of the airflow blown out of the first hull and the temperature of the airflow blown out of the second hull is ΔT, 0<│ΔT│≤50°C.

3. The electrode baking device according to claim 1, characterized in that: The electrode baking device also includes a heat exchanger, which is arranged in the first fresh air channel or the second fresh air channel, and is used to heat or cool the airflow flowing through the first fresh air channel or the second fresh air channel.

4. The pole piece baking device according to claim 3, characterized in that: The heat exchanger is disposed at a connection point between the first hull and the first fresh air passage; and / or the heat exchanger is disposed at a connection point between the second hull and the second fresh air passage.

5. The electrode baking device according to claim 1, characterized in that: The pole piece baking device further comprises a baking box, wherein the first hull and the second hull are both arranged in the baking box; the pole piece baking device further comprises an exhaust duct, wherein the exhaust duct is connected to the baking box.

6. The pole piece baking device according to claim 5, characterized in that: The pole piece baking device includes a waste heat recovery component, the waste heat recovery component is connected to the exhaust duct, and the waste heat recovery component exchanges heat with the first fresh air channel and / or the second fresh air channel.

7. The electrode baking device according to claim 6, characterized in that: The exhaust duct includes an air return section and an exhaust section, the air return section is connected to the baking oven, the waste heat recovery component has a first channel and a second channel that are not connected to each other, the first channel is connected to the air return section and the exhaust section, and the second channel is connected to the first fresh air channel and / or the second fresh air channel.

8. The pole piece baking device according to claim 7, characterized in that: The waste heat recovery component includes a first waste heat recovery component and a second waste heat recovery component, the first waste heat recovery component exchanges heat with the first fresh air channel, and the second waste heat recovery component exchanges heat with the second fresh air channel; The return air section has a first recovery port and a second recovery port, the first recovery port is connected to the first waste heat recovery component, the second recovery port is connected to the second waste heat recovery component, and an adjustment component is provided between the first recovery port and the second recovery port, and the adjustment component is used to adjust the air flow rate flowing to the first recovery port and the second recovery port.

9. The pole piece baking device according to claim 8, characterized in that: The regulating member includes a driving member and a distribution plate, wherein the distribution plate is arranged between the first recovery port and the second recovery port, the distribution plate is rotationally connected to the return air section, the output end of the driving member is transmission-connected to the distribution plate, and the driving member is used to drive the distribution plate to rotate so as to adjust the air flow rate flowing to the first recovery port and the second recovery port.

10. The pole piece baking device according to claim 5, characterized in that: The baking device includes a first fresh air duct, a first air inlet box and a first air uniforming box. The first fresh air duct, the first air inlet box and the first air uniforming box are connected in sequence to form the first fresh air channel. The first air inlet box and the first air uniforming box are adjacently arranged along a first direction; the baking box is connected to the first air uniforming box along a second direction; the second direction is not parallel to the first direction.

11. The pole piece baking device according to any one of claims 1 to 10, characterized in that: A filter is provided in the first fresh air passage and / or the second fresh air passage.

12. A coating machine, characterized in that: The coating machine comprises a coating device and a pole piece baking device according to any one of claims 1 to 11, wherein the coating device is used to coat slurry on the surface of the pole piece, and the pole piece baking device is used to dry the slurry on the pole piece.

13. The coating machine according to claim 12, characterized in that: The coating device is used to coat a first slurry layer on the surface of the pole piece, and to coat a second slurry layer on the surface of the first slurry layer, wherein the concentration of the first slurry layer is greater than that of the second slurry layer.

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