Lithium battery diaphragm heat treatment device

Abstract

The utility model discloses a lithium battery diaphragm heat treatment device, which relates to the technical field of lithium battery diaphragm equipment and comprises a bottom plate, and a preheating box and a heating structure are arranged on the top surface of the bottom plate; a horizontal drying box is arranged on the top face of an inner cavity of the heating box, a vertical drying box is arranged on the inner wall, close to the preheating box, of the heating box, and a heat conduction plate is arranged on the face, close to the preheating box, of the vertical drying box. Return pipes are arranged on the side surfaces of the preheating box and the heating box, and exhaust fans are arranged in the return pipes; by arranging the heating structure, a transmission roller of the heating structure can enable a processing film to bend and incline in an inner cavity, so that the horizontal drying machine and the vertical drying machine simultaneously heat the upper surface and the lower surface of the processing film, and the heat treatment on the surface of the lithium battery diaphragm can be uniform; the backflow pipe can drive hot air in the heating box to enter the preheating box, the backflow pipe is arranged on the side face of the preheating box and the side face of the heating box, the blown hot air is prevented from directly blowing the film face of the machining film, and looseness of the machining film during movement is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery separator equipment, and particularly relates to a heat treatment device for lithium battery separators. Background Technique

[0002] The four key materials of lithium-ion batteries are the positive electrode material, negative electrode material, electrolyte, and separator. The main function of the separator is to isolate the positive and negative electrodes and prevent electrons from passing through, while allowing ions to pass through, so as to complete the rapid transmission of lithium ions between the positive and negative electrodes during the charge and discharge process. The quality of the separator directly affects the battery internal resistance, discharge capacity, cycle service life, and battery safety performance. The thinner the separator and the higher the porosity, the smaller the internal resistance of the battery and the better the high-rate discharge performance. In the structure of a lithium battery, the separator is one of the key inner components. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, and directly affects the characteristics such as the capacity, cycle, and safety performance of the battery. A separator with excellent performance plays an important role in improving the comprehensive performance of the battery.

[0003] In the prior art, lithium battery separators need to be heated by specific heat treatment equipment. For example, a heat treatment device for lithium battery separators with the publication number CN209880716U includes a preheating chamber, a heat treatment chamber, and a air supply chamber. The heat treatment chamber is arranged on one side of the preheating chamber, the air supply chamber is arranged on one side of the top of the preheating chamber, a vertical plate is arranged near the middle position of the top of the heat treatment chamber, a telescopic motor is arranged on one side of the vertical plate, and a telescopic sleeve rod is arranged on one side of the telescopic motor.

[0004] This kind of heat treatment equipment only dries and heats one side of the lithium battery separator, and the dryer cannot directly contact the other side of the separator, so the heat treatment and drying efficiency of the two sides are different. At the same time, the air flowing through the return pipe of this kind of heat treatment equipment directly blows the film surface of the separator, causing the separator to shake itself and become slack, which affects the transmission. Summary of the Invention

[0005] The purpose of the utility model is to solve the problems in the above background technique, and propose a heat treatment device for lithium battery separators.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] A heat treatment device for a lithium battery separator, comprising a bottom plate. A preheating box and a heating structure are arranged on the top surface of the bottom plate, and the heating box of the heating structure is arranged on one side of the preheating box; the inner cavities of the preheating box and the heating box are communicated, and two transmission rollers with different heights are rotatably arranged inside the heating box; a horizontal drying box is arranged on the top surface of the inner cavity of the heating box, a vertical drying box is arranged on the inner wall of the heating box close to the preheating box, and a heat conduction plate is arranged on the side of the vertical drying box close to the preheating box; a return pipe is arranged on the side surfaces of the preheating box and the heating box, and an exhaust fan is arranged inside the return pipe.

[0008] As a further scheme of the utility model: an installation tank is arranged on the surface of the return pipe, and the inner cavity of the installation tank is communicated with the return pipes at both ends; connecting plates are arranged on both sides of the inner wall of the installation tank, and the connecting plates are fixedly connected with the exhaust fan.

[0009] As a further scheme of the utility model: a plurality of ventilation holes are formed in the surface of the connecting plate.

[0010] As a further scheme of the utility model: communication grooves are arranged on the inner walls of the preheating box and the heating box, and the communication grooves are communicated with the inner cavities of the preheating box and the heating box.

[0011] As a further scheme of the utility model: an inlet groove is arranged on the side of the preheating box away from the heating box, and the inlet groove and the communication groove are located in the same horizontal plane.

[0012] As a further scheme of the utility model: an outlet groove is arranged on the side of the heating box away from the preheating box, and the outlet groove is located below the communication groove.

[0013] The beneficial effects of the utility model are as follows:

[0014] (1) For the heat treatment device for a lithium battery separator of the utility model, by setting a heating structure, the transmission rollers of the heating structure can make the processed film bend and incline in the inner cavity, so that the horizontal dryer and the vertical dryer can simultaneously heat-treat the upper and lower surfaces of the film, making the heat treatment on the surface of the lithium battery separator uniform;

[0015] (2) For the heat treatment device for a lithium battery separator of the utility model, by setting a preheating structure, the processed film enters the preheating box for preheating, avoiding the deformation of the film surface caused by too high temperature gradient in the heating box; the return pipe can drive the hot air in the heating box into the preheating box, and the return pipe is arranged on the side surfaces of the preheating box and the heating box, avoiding the hot air blown directly from blowing the film surface of the processed film and avoiding the processed film from not being tensioned during movement;

[0016] (3) For the heat treatment device for a lithium battery separator of the utility model, during the working process, the vertical drying box can transfer its own heat to the preheating box through the heat conduction plate, thereby increasing the temperature of the preheating box; at the same time, the vertical drying box itself can dissipate heat through the heat conduction plate, avoiding the vertical drying box from scalding the inner wall of the heating box. Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 is a schematic structural diagram of a heat treatment device for a lithium battery separator of the present utility model;

[0019] Figure 2 is a schematic internal structure diagram of a heat treatment device for a lithium battery separator of the present utility model;

[0020] Figure 3 is a schematic top view structure diagram of a heat treatment device for a lithium battery separator of the present utility model;

[0021] Figure 4 is the present utility model Figure 3 a partial enlarged view of part A in.

[0022] In the figure: 1, bottom plate; 2, heating structure; 21, heating box; 22, driving roller; 23, horizontal dryer; 24, vertical dryer; 25, heat conducting plate; 26, film outlet groove; 3, preheating structure; 31, preheating box; 32, inlet groove; 33, communication groove; 4, reflux structure; 41, reflux pipe; 42, installation tank; 43, connecting plate; 44, exhaust fan; 45, ventilation hole; 5, processed film. Detailed Embodiment

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figures 1-4As shown in the figure, the utility model relates to a heat treatment device for a lithium battery separator, which includes a bottom plate 1. A preheating structure 3 and a heating structure 2 are arranged on the top surface of the bottom plate 1. The preheating box 6 of the preheating structure 3 is fixedly connected to the top surface of the bottom plate 1. Entering grooves 32 and communicating grooves 33 are respectively formed on both sides of the preheating box 6, and the entering groove 32 and the communicating groove 33 are located in the same horizontal plane. A heating box 21 is fixedly connected to the top surface of the bottom plate 1, and the surface of the heating box 21 is in contact with the surface of the preheating box 6 where the communicating groove 33 is arranged. A communicating groove 33 is arranged on the surface of the heating box 21 close to the preheating box 6, and the two communicating grooves 33 communicate the inner cavities of the heating box 21 and the preheating box 6. Two driving rollers 22 are rotatably arranged in the inner cavity of the heating box 21. An outlet film groove 26 is arranged on the surface of the heating box 21 far from the preheating box 6. The outlet film groove 26 is arranged along the horizontal direction and is located below the communicating groove 33. A horizontal dryer 23 is arranged on the top surface of the heating box 21, and the output end of the horizontal dryer 23 is arranged on the top surface of the inner cavity of the heating box 21. A vertical dryer 24 is arranged in the inner cavity of the heating box 21, and the vertical dryer 24 is located on the inner wall of the heating box 21 close to the preheating box 6. A heat conducting plate 25 is fixedly connected to the surface of the vertical dryer 24, and the heat conducting plate 25 is located in the inner walls of the heating box 21 and the preheating box 6. A reflux structure 4 is arranged between the surfaces of the heating box 21 and the preheating box 6. The reflux pipe 41 of the reflux structure 4 is fixedly arranged on the sides of the preheating box 6 and the heating box 21, and both ends of the reflux pipe 41 are communicated with the inner cavities of the preheating box 6 and the heating box 21. An installation tank 42 is arranged on the surface of the reflux pipe 41, and the inner cavity of the installation tank 42 is communicated with the reflux pipe 41 at both ends. Connecting plates 43 are fixedly arranged on the inner walls on both sides of the installation tank 42, and an exhaust fan 44 is fixedly connected between the two connecting plates 43. Communication holes are formed on the surface of each connecting plate 43. The processing film 5 to be heat treated passes through the inner cavities of the preheating box 6 and the heating box 21. The processing film 5 enters the inner cavity of the preheating box 6 from the entering groove 32 of the preheating box 6, and then enters the inner cavity of the heating box 21 through the communicating groove 33. The surface of the processing film 5 is successively in contact with the two driving rollers 22 with different heights, and then is discharged from the outlet film groove 26 of the heating box 21.

[0025] When using this lithium battery separator heat treatment device, the processing film 5 is set from the inlet tank 32 and enters the inner cavity of the heating box 21 through the connecting tank 33. The processing film 5 sequentially contacts the driving rollers 22 in the inner cavity of the heating box 21 for tensioning and bending, and then is discharged from the film outlet slot 26. At this time, the horizontal dryer 23 and the vertical dryer 24 of the heating box 21 are started. Due to the two driving rollers 22 with different heights, the processing film 5 is bent. The horizontal dryer 23 can heat-treat the upper surface of the lower processing film 5. The bent processing film 5 inclines the lower surface towards the vertical dryer 24, and the vertical dryer 24 can heat-treat the lower surface of the processing film 5. The inner cavity of the heating box 21 can simultaneously perform heat treatment on the upper and lower surfaces of the processing film 5, so as to uniformly and comprehensively perform heat treatment on the separator of the lithium battery. Before entering the heating box 21, the preheating box 6 preheats the processing film 5. The drying box heats the inner cavity temperature of the heating box 21, and the hot air in the heating box 21 can enter the return pipe 41. At this time, the exhaust fan 44 is started, and the exhaust fan 44 drives the hot air to flow back into the preheating box 31 through the return pipe 41, thereby increasing the temperature inside the preheating box 6. The processing film 5 first enters the preheating box 6 for preheating and preliminary heat treatment to avoid rapid expansion of the film surface due to too high a heat treatment temperature gradient of the processing film 5. During the operation of the vertical dryer 24, the heat generated by the vertical dryer 24 itself will be transferred through the heat conduction plate 25, further increasing the heat of the preheating box 6. At the same time, the excellent heat transfer performance of the heat conduction plate 25 itself can dissipate the temperature of the vertical dryer 24 itself, avoiding the inner wall of the heating box 21 being scalded by the high-temperature vertical dryer 24. The return pipe 41 is arranged on the sides of the heating box 21 and the preheating box 6 to prevent the returned air from blowing the film surface of the processing film 5 and causing the processing film 5 to not be tensioned.

[0026] The working principle of the present utility model: A lithium battery separator heat treatment device of the present utility model is provided with a heating structure 2. The driving roller 22 of the heating structure 2 can bend and incline the processing film 5 in the inner cavity, so that the horizontal dryer 23 and the vertical dryer 24 simultaneously heat-treat the upper and lower surfaces of the processing film 5, making the heat treatment on the surface of the lithium battery separator uniform; by setting a preheating structure 3, the processing film 5 enters the preheating box 6 for preheating to avoid film surface deformation caused by too high a temperature gradient in the heating box 21; the return pipe 41 can drive the hot air in the heating box 21 into the preheating box 6. The return pipe 41 is arranged on the sides of the preheating box 6 and the heating box 21 to prevent the blown hot air from directly blowing the film surface of the processing film 5 and causing the processing film 5 to not be tensioned during movement; during the operation of the vertical drying box, its own heat can be transferred to the preheating box 6 through the heat conduction plate 25, thereby increasing the temperature of the preheating box 6; at the same time, the vertical drying box itself can dissipate heat through the heat conduction plate 25 to avoid the inner wall of the heating box 21 being scalded by the vertical drying box.

[0027] The above has described in detail an embodiment of the present utility model, but the above content is only a preferred embodiment of the present utility model and cannot be considered as limiting the scope of implementation of the present utility model. All equivalent changes and improvements made according to the scope of application of the present utility model shall still fall within the scope covered by the patent of the present utility model.

Claims

1. A heat treatment device for a lithium battery separator, characterized in that, It includes a bottom plate (1). On the top surface of the bottom plate (1), there are arranged a preheating box (6) and a heating structure (2). The heating box (21) of the heating structure (2) is arranged on one side of the preheating box (6); the inner cavities of the preheating box (6) and the heating box (21) are communicated. Inside the heating box (21), there are rotatably arranged two driving rollers (22) with different heights; on the top surface of the inner cavity of the heating box (21), there is a horizontal drying box, on the inner wall of the heating box (21) close to the preheating box (6), there is a vertical drying box, and on one side of the vertical drying box close to the preheating box (6), there is a heat conducting plate (25); on the side surfaces of the preheating box (6) and the heating box (21), there is a return pipe (41), and inside the return pipe (41), there is an exhaust fan (44).

2. The heat treatment device for a lithium battery separator according to claim 1, characterized in that, On the surface of the return pipe (41), there is an installation tank (42). The inner cavity of the installation tank (42) is communicated with the return pipes (41) at both ends; on both sides of the inner wall of the installation tank (42), there are connecting plates (43), and the connecting plates (43) are fixedly connected with the exhaust fan (44).

3. The heat treatment device for a lithium battery separator according to claim 2, wherein On the surface of the connecting plate (43), there are provided a number of ventilation holes (45).

4. A heat treatment device for a lithium battery separator according to claim 1, characterized in that, On the inner walls of the preheating box (6) and the heating box (21), there are communicating grooves (33), and the communicating grooves (33) are communicated with the inner cavities of the preheating box (6) and the heating box (21).

5. A heat treatment device for a lithium battery separator according to claim 1, characterized in that On one side of the preheating box (6) away from the heating box (21), there is an inlet groove (32), and the inlet groove (32) and the communicating groove (33) are in the same horizontal plane.

6. The heat treatment device for a lithium battery separator according to claim 1, characterized in that, On one side of the heating box (21) away from the preheating box (6), there is an outlet groove, and the outlet groove is below the communicating groove (33).

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