A lithium battery pole piece oven

Abstract

The utility model discloses a lithium battery pole piece oven, comprising an oven body and a first air chamber and a second air chamber which are arranged in the oven body and are relatively arranged, the first air chamber is provided with a plurality of first air nozzles, the second air chamber is provided with a plurality of second air nozzles, the first air nozzles and the second air nozzles are relatively staggered, an air flotation roller for supporting the battery pole piece is arranged between the first air chamber and the second air chamber and spaced apart from the second air nozzle, the air flotation roller is adopted to replace the traditional roller bearing, when the air flotation roller runs in the oven, the air flotation roller can avoid metal friction between parts and reduce friction resistance, on the one hand, even when the lithium battery pole piece and the air flotation roller are at a small wrap angle, the air flotation roller can rotate synchronously with the substrate without slipping, thereby improving production efficiency; on the other hand, the air flotation roller will not wear out, iron filings can be avoided from entering the pole piece, and safety hazards are eliminated.

Description

Technical Field

[0001] The utility model relates to the field of lithium battery processing, in particular to a lithium battery pole piece drying oven. Background Art

[0002] As the market puts forward higher and more stringent requirements for the consistency of batteries, battery manufacturers are also pursuing the coating accuracy of coating equipment to the extreme. In the lithium battery drying box, a roller is usually used to convey the substrate. The roller is widely used in the coating process of lithium batteries. It is fixed and driven by bearings, and has high requirements for installation and commissioning. Excessive preload will reduce the life of the bearings. Wear of the bearings during use will cause iron filings to enter the pole pieces, which will bring safety hazards to the battery. Since the roller rotates by the friction between the roller surface and the substrate, when the working condition is a small wrap angle, the contact surface between the substrate and the roller is small, and the friction required for the rotation of the roller cannot be provided, which affects the transmission torque, causing the substrate to slip on the surface of the roller, affecting the transmission of the substrate and thus affecting the coating quality. In the prior art, a motor is installed on one side of the roller to provide power for the substrate transportation to solve the problem that the roller will slip or cannot rotate when the contact surface between the roller surface and the substrate is small, but the synchronization between the motors is difficult to ensure, so the roller and the substrate will still slip, which affects the coating effect. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a lithium battery pole piece drying oven, which adopts air floating rollers to replace traditional roller bearings, thereby solving the problem of battery pole pieces slipping when being transported in the oven.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A lithium battery pole piece oven, comprising an oven body, and a first air cavity and a second air cavity arranged in the oven body and arranged opposite to each other, the first air cavity is provided with a plurality of first air nozzles, the second air cavity is provided with a plurality of second air nozzles, the first air nozzles and the second air nozzles are arranged in a staggered manner relative to each other, and an air flotation roller for supporting a battery pole piece is arranged between the first air cavity and the second air cavity and spaced from the second air nozzles;

[0006] The air-floating roller comprises a roller body and a floating end assembly sleeved at both ends of the roller body, the floating end assembly comprises an air-floating bearing seat with a closed air chamber, an air-floating sleeve arranged in the closed air chamber and an air-floating bracket for fixing the air-floating sleeve, one end of the roller body is sleeved in the air-floating sleeve, and an air inlet is arranged on the air-floating bearing seat;

[0007] High-pressure air is introduced from the air inlet, passes through the air-floating sleeve and forms an air film inside the air-floating sleeve, and the air film is used to support the roller body.

[0008] Furthermore, the air-floating sleeve is composed of an air-floating material, and the air-floating material is a sponge-like structure with micron-level gaps.

[0009] Furthermore, a plurality of the first air nozzles are evenly spaced on the first air cavity, a plurality of the second air nozzles are evenly spaced on the second air cavity, and a projection of the first air nozzle on the second air cavity is located in the middle of two adjacent second air nozzles.

[0010] Furthermore, the air flotation roller is located between two adjacent second air nozzles and directly opposite to the first air nozzle.

[0011] Furthermore, two second air nozzles are provided between two adjacent air flotation rollers and are directly opposite to the first air nozzle.

[0012] Furthermore, an end surface of the air flotation roller away from the second air cavity is higher than an end surface of the second air nozzle away from the second air cavity.

[0013] Furthermore, the air flotation roller fixing member is fixedly connected to the oven body.

[0014] Furthermore, a first air inlet is provided at one end of the first air cavity, a second air inlet is provided at one end of the second air cavity, and the first air inlet is communicated with the second air inlet.

[0015] Furthermore, the height of the first air cavity gradually decreases in a direction away from the first air inlet, and the height of the second air cavity gradually decreases in a direction away from the second air inlet.

[0016] Furthermore, guide plates are provided in the first air cavity and the second air cavity, and at the first air inlet and the second air inlet.

[0017] Furthermore, the guide plate includes a first guide plate and a second guide plate, one end of the first guide plate and the second guide plate faces the first air inlet, and the other end faces two ends of the first air cavity or the second air cavity respectively.

[0018] The beneficial effects of the utility model are:

[0019] The utility model discloses a lithium battery pole piece drying oven, which adopts an air flotation roller to replace the traditional roller bearing. When the air flotation roller runs in the drying oven, the air flotation roller can avoid metal friction between parts and reduce friction resistance. On the one hand, even when the lithium battery pole piece and the air flotation roller are at a small wrap angle, the air flotation roller can rotate synchronously with the substrate without slipping, thereby improving production efficiency. On the other hand, the air flotation roller will not wear out, thus preventing iron filings from entering the pole piece and eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the assembly of the utility model;

[0022] Figure 2 This is a structural split diagram of the utility model;

[0023] Figure 3 This is a structural disassembly diagram of the second embodiment of the utility model;

[0024] Figure 4 It is an assembly schematic diagram of the second embodiment of the utility model;

[0025] Figure 5 It is a cross-sectional schematic diagram of the air flotation roller of the utility model.

[0026] in,

[0027] 1. Oven body;

[0028] 2. first air cavity; 21. first air nozzle; 22. first air inlet;

[0029] 3. Second air cavity; 31. Second air nozzle; 32. Second air inlet;

[0030] 4. air-floating roller; 41. roller body; 42. movable end assembly; 421. air-floating bearing seat; 422. sealed air chamber; 423. air-floating sleeve; 424. air-floating bracket; 4211. air inlet;

[0031] 5. Guide plate; 51. First guide plate; 52. Second guide plate. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0033] The lithium battery pole piece is dried in an oven. During the drying process, the pole piece enters from one end of the oven for drying, and then exits from the other end to enter the next process. In the existing scheme, the pole piece is generally transferred from one end of the oven to the other end by a roller, but the roller is fixedly driven by a bearing, which has high requirements for installation and debugging. Excessive preload will reduce the life of the bearing. During use, the bearing will wear out, which will cause iron filings to enter the pole piece, thereby posing a safety hazard to the battery. In addition, it will slip or be unable to rotate under small wrap angle conditions. Even if a motor is installed on one side of the roller to provide power for the transportation of the pole piece, the synchronization between the motors is difficult to ensure, which will still cause slippage between the roller and the pole piece. Therefore, the utility model provides a lithium battery pole piece drying oven, which adopts an air floating roller 4 to replace the traditional roller bearing, thereby solving the problem of slippage of the battery pole piece when it is transported in the oven.

[0034] Reference Figure 1-3 As shown, a lithium battery pole piece drying oven of the utility model comprises an oven body 1 and a first wind chamber 2 and a second wind chamber 3 which are arranged opposite to each other in the oven body 1, wherein the first wind chamber 2 and the second wind chamber 3 are parallel to each other, a plurality of first wind nozzles 21 are arranged on the first wind chamber 2, and a plurality of second wind nozzles 31 are arranged on the second wind chamber 3. It can be understood that the first wind nozzle 21 is connected with the first wind chamber 2, and the second wind nozzle 31 is connected with the second wind chamber 3. Drying gas enters the first wind chamber 2 and the second wind chamber 3, and then outputs drying gas through the first wind nozzle 21 and the second wind nozzle 31 respectively. When the pole piece is transferred between the first wind nozzle 21 and the second wind nozzle 31, the pole piece is dried.

[0035] Reference Figure 3 In the oven body 1, the first air nozzle 21 and the second air nozzle 31 are relatively staggered so that the forces on both sides of the electrode sheet reach a balanced state. However, since the forces of the drying gas blown out by the first air nozzle 21 and the second air nozzle 31 are difficult to make the electrode sheet reach a complete balance, it will cause the electrode sheet to sink and wrinkle during the oven transmission process. Therefore, an air flotation roller 4 for supporting the battery electrode sheet is provided between the first air cavity 2 and the second air cavity 3 and separated from the second air nozzle 31. The electrode sheet is supported by the air flotation roller 4, which can not only support the electrode sheet and prevent it from sinking and wrinkling, but also solve the problem of slipping during the transmission of the electrode sheet under the condition of small wrap angle.

[0036] Among them, the small wrap angle condition means that during the transmission of the pole piece, there are few contact points between the pole piece and the roller surface, so that the contact area is very small, so that the friction between the pole piece and the roller becomes smaller, which can easily lead to the pole piece slipping during the transmission process.

[0037] Reference Figure 5The air-floating roller 4 adopted in the utility model comprises a roller body 41 and a movable end assembly 42 sleeved on both ends of the roller body, the movable end assembly 42 comprises an air-floating bearing seat 421 having a closed air chamber 422, an air-floating sleeve 423 arranged in the closed air chamber 422 and an air-floating bracket for fixing the air-floating sleeve, one end of the roller body 41 is sleeved in the air-floating sleeve 423, and an air inlet 4211 is provided on the air-floating bearing seat 421; high-pressure air is introduced through the air inlet 4211, and the high-pressure air passes through the air-floating sleeve 423 and forms an air film inside the air-floating sleeve 423, and the air film is used to support the roller body 41. The air-floating roller 4 is suspended and supported by the air film formed in the air-floating sleeve 423, so that the jumping accuracy of the air-floating roller 4 is higher than that of ordinary bearing rollers. In addition, it rotates in a non-contact form without mechanical friction, so that even under small wrap angle conditions, there will be no slipping between the pole piece and the air-floating roller 4. Moreover, there is no wear, which can greatly improve the service life of the equipment and almost no need for subsequent maintenance. Furthermore, the air-floating sleeve 423 is composed of an air-floating material, which is a sponge-like structure with micron-level gaps. After high-pressure air passes through the air-floating sleeve 423, a micron-level air film is formed to support the roller body 41.

[0038] In some embodiments, the air flotation roller 4 is fixedly connected to the oven body 1 through a fixing member (not shown in the figure). Specifically, the air flotation roller 4 is fixedly connected to the oven body 1 through a ball bolt, which not only reduces the difficulty of installation, but also improves the installation accuracy of the air flotation roller 4.

[0039] like Figure 3 As shown, in some embodiments, a plurality of the first air nozzles 21 are arranged at equal intervals on the first air cavity 2, and a plurality of the second air nozzles 31 are arranged at equal intervals on the second air cavity 3, and the projection of the first air nozzle 21 on the second air cavity 3 is located in the middle of two adjacent second air nozzles 31. It can be understood that the spacing distance between any two adjacent first air nozzles 21 is the same, and the spacing distance between any two adjacent second air nozzles 31 is the same. Therefore, during the transmission of the pole piece, the forces on the upper and lower sides of the pole piece can be kept balanced. In some embodiments, the air flotation roller 4 is located between two adjacent second air nozzles 31 and directly opposite to the first air nozzle 31.

[0040] In some embodiments, two second air nozzles 31 are provided between two adjacent air flotation rollers 4 and are directly opposite to the first air nozzle 31. It is understandable that the air flotation roller 4 can be set in the middle between any two second air nozzles 31, that is, one air flotation roller 4 is provided for every second air nozzle 31, so as to support the electrode sheet and move relative to the electrode sheet, and the electrode sheet is transferred from one end of the oven to the other end under the support of the air flotation roller 4; while meeting the support requirements for the electrode sheet, two second air nozzles 31 can also be provided between the two air flotation rollers 4, which can not only support the electrode sheet, but also reduce the number of air flotation rollers 4, saving production costs without affecting the support effect. In some embodiments, the air flotation roller 4 can also be used in combination with the above two setting methods, as long as the support requirements for the electrode sheet are met.

[0041] Reference Figure 3 In some embodiments, the end surface of the air flotation roller 4 away from the second air cavity 3 is higher than the end surface of the second air nozzle 31 away from the second air cavity 3. During the electrode piece conveying process, the air flotation roller 4 can support the electrode piece, and the second air nozzle 31 can blow out dry gas to dry the electrode piece.

[0042] Reference Figure 3-4 In some embodiments, a first air inlet 22 is provided at one end of the first air cavity 2, a second air inlet 32 ​​is provided at one end of the second air cavity 3, and the first air inlet 22 and the second air inlet 32 ​​are connected to each other. Dry gas is uniformly transported and then enters through the first air inlet 22 and the second air inlet 32 ​​respectively. The first air inlet 22 and the second air inlet 32 ​​are connected to each other so that the pressure and temperature in the first air cavity 2 and the second air cavity 3 are kept consistent, and the blown dry gas can better dry the electrode.

[0043] Furthermore, the height of the first air cavity 2 gradually decreases in the direction away from the first air inlet 22, and the height of the second air cavity 3 gradually decreases in the direction away from the second air inlet 32. It can be understood that when the air inlet is at one end of the air cavity, the dry gas flows faster at one end and the pressure will be higher. Therefore, when the dry gas moves in the direction away from the second air inlet 32, the cavity height gradually decreases and the gas flow rate will be faster. According to Bernoulli's principle, the gas flow rate is faster and the pressure can be increased, thereby compensating for the pressure loss of the dry gas away from the air inlet, so that the uniform dry gas output through the first air cavity 2 and the second air cavity 3 improves the drying effect on the electrode, and keeps the electrode in a more constant conveying state during the transmission in the oven, further improving the drying effect and drying efficiency.

[0044] Reference Figure 4In some embodiments, in order to provide more uniform dry gas, guide plates 5 are provided in the first air cavity 2 and the second air cavity 3, and at the first air inlet 22 and the second air inlet 32. The guide plates 5 guide the gas at the air inlet to the first air cavity 2 and the second air cavity 3. Specifically, the guide plates 5 include a first guide plate 51 and a second guide plate 52, one end of the first guide plate 51 and the second guide plate 52 faces the first air inlet 22, and the other end faces the two ends of the first air cavity 2 or the second air cavity 3, respectively. More specifically, the guide plates 5 are arc-shaped, so that the dry gas at the air inlet can enter the first air cavity 2 and the second air cavity 3 more efficiently, reducing the energy loss of the dry gas.

[0045] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A lithium battery pole piece oven, characterized in that: The invention comprises an oven body, and a first air cavity and a second air cavity which are arranged in the oven body and are arranged opposite to each other, wherein the first air cavity is provided with a plurality of first air nozzles, the second air cavity is provided with a plurality of second air nozzles, the first air nozzles and the second air nozzles are arranged in a staggered manner relative to each other, and an air flotation roller for supporting a battery electrode sheet is arranged between the first air cavity and the second air cavity and spaced apart from the second air nozzles; The air-floating roller comprises a roller body and a floating end assembly sleeved at both ends of the roller body, the floating end assembly comprises an air-floating bearing seat with a closed air chamber, an air-floating sleeve arranged in the closed air chamber and an air-floating bracket for fixing the air-floating sleeve, one end of the roller body is sleeved in the air-floating sleeve, and an air inlet is arranged on the air-floating bearing seat; High-pressure air is introduced from the air inlet, passes through the air-floating sleeve and forms an air film inside the air-floating sleeve, and the air film is used to support the roller body.

2. The oven according to claim 1, characterized in that The air-floating sleeve is composed of an air-floating material, and the air-floating material is a sponge-like structure with micron-level gaps.

3. The oven according to claim 1, characterized in that A plurality of the first air nozzles are evenly spaced on the first air cavity, a plurality of the second air nozzles are evenly spaced on the second air cavity, and a projection of the first air nozzle on the second air cavity is located in the middle of two adjacent second air nozzles.

4. The oven according to claim 3, characterized in that The air flotation roller is located between two adjacent second air nozzles and directly opposite to the first air nozzle.

5. The oven according to claim 3, characterized in that Two second air nozzles are arranged between two adjacent air flotation rollers and are directly opposite to the first air nozzle.

6. The oven according to any one of claims 2 to 5, characterized in that: An end surface of the air flotation roller away from the second air cavity is higher than an end surface of the second air nozzle away from the second air cavity.

7. The oven according to claim 1, characterized in that A first air inlet is provided at one end of the first air cavity, a second air inlet is provided at one end of the second air cavity, and the first air inlet is communicated with the second air inlet.

8. The oven according to claim 7, characterized in that The height of the first air cavity gradually decreases in a direction away from the first air inlet, and the height of the second air cavity gradually decreases in a direction away from the second air inlet.

9. The oven according to claim 7, characterized in that Guide plates are arranged in the first air cavity and the second air cavity, and at the first air inlet and the second air inlet.

10. The oven according to claim 9, characterized in that The guide plate includes a first guide plate and a second guide plate, wherein one end of the first guide plate and the second guide plate faces the first air inlet, and the other end faces two ends of the first air cavity or the second air cavity respectively.

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