Drying device for lithium battery negative plate

Abstract

The drying device comprises a drying box and a circulating pipe, in the length direction of the drying box, a feeding port is formed in one end of the drying box, and a discharging port is formed in the other end of the drying box; one end of the circulating pipe is an air inlet, and the other end is provided with an air outlet; a circulating fan is further arranged on the circulating pipe; the air inlet is connected with one end of a discharge port of the drying box, and the air outlet is connected with one end of a feed port of the drying box; the circulating pipe is further provided with a water module, a heating module is arranged in the drying box, meanwhile, the drying device further comprises a controller, and the controller is electrically connected with the circulating fan and the heating module. Compared with the prior art, high-temperature humid air generated by drying can be discharged out of the drying box in time, so that the situation that a large amount of humid and hot air is gathered in the drying box, and the dried lithium battery negative plate is infiltrated again is avoided, the drying quality is guaranteed, meanwhile, repeated drying is avoided, and the drying efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of charging devices, and particularly to a drying device for the negative electrode sheet of a lithium battery. Background Art

[0002] Lithium batteries have been widely used due to their high energy density. During the production process of lithium battery negative electrode sheets, a coating process is required. The coating process of lithium batteries refers to the process of coating active substances on the positive and negative electrodes of lithium-ion batteries. After coating, the electrode sheets need to be baked to achieve rapid curing of the active substances and ensure the smooth progress of subsequent processes. In the prior art, the above processes are generally achieved through baking equipment, but the baking efficiency of the baking equipment in the prior art is relatively low. Utility Model Content

[0003] The main purpose of this application is to provide a drying device for the negative electrode sheet of a lithium battery, aiming to solve the defect of low drying efficiency existing in the prior art.

[0004] This application achieves the above purpose through the following technical solutions:

[0005] A drying device for the negative electrode sheet of a lithium battery, including a drying box. Along the length direction of the drying box, one end of the drying box is provided with a feed inlet, and the other end is provided with a discharge outlet;

[0006] A circulation pipe, one end of the circulation pipe is an air inlet, and the other end is provided with an air outlet; a circulation fan is also provided on the circulation pipe; the air inlet is connected to one end of the discharge outlet of the drying box, and the air outlet is connected to one end of the feed inlet of the drying box;

[0007] A dehydration module, which is arranged on the circulation pipe;

[0008] A heating module, which is arranged in the drying box;

[0009] A controller, which is electrically connected to the circulation fan and the heating module respectively.

[0010] Optionally, a first partition board and a second partition board are arranged in the drying box, and conveying grooves are arranged on both the first partition board and the second partition board; along the material flow direction, the first partition board and the second partition board divide the drying box into a preheating zone, a drying zone and a cooling zone.

[0011] Optionally, temperature sensors are arranged in the preheating zone, the drying zone and the cooling zone, and each temperature sensor is electrically connected to the controller respectively.

[0012] Optionally, the drying device further includes a first humidity detection module and a second humidity detection module. The first humidity detection module is disposed at the inlet end of the dehydration module, and the second humidity detection module is disposed at the outlet end of the dehydration module. The first humidity detection module and the second humidity detection module are respectively electrically connected to the controller.

[0013] Optionally, the drying device further includes a shunt pipe, a confluence pipe, and a plurality of dehydration branch pipes. Each dehydration branch pipe is provided with a dehydration module. The inlet ends of the dehydration branch pipes are respectively connected in parallel to the shunt pipe, and the outlet ends of the dehydration branch pipes are respectively connected in parallel to the confluence pipe.

[0014] Optionally, the dehydration module includes a dehydration tank. The dehydration tank is provided with an air inlet and an air outlet, and filter nets are provided on both the air inlet and the air outlet. The dehydration tank is filled with a dehydrating agent.

[0015] Optionally, a loading port is further provided at the top of the dehydration tank, and a sealing plate for closing the loading port is connected to the dehydration tank.

[0016] Optionally, along the edge of the loading port, a plurality of connecting screws are provided on the dehydration tank, a plurality of connecting holes are provided on the sealing plate, and the connecting screws are respectively inserted into the connecting holes. Fixing nuts are provided on the connecting screws.

[0017] Optionally, a sealing strip is further provided on the sealing plate, and the sealing strip fits with the top surface of the dehydration tank.

[0018] Optionally, the controller includes an industrial computer and a PLC, and the industrial computer is communicatively connected to the PLC through a data line.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application includes a drying box and a circulation pipe. Along the length direction of the drying box, one end of the drying box is provided with a feed inlet, and the other end is provided with a discharge outlet. One end of the circulation pipe is an air inlet, and the other end is provided with an air outlet. A circulation fan is further provided on the circulation pipe. The air inlet is connected to one end of the discharge outlet of the drying box, and the air outlet is connected to one end of the feed inlet of the drying box. A water module is further provided on the circulation pipe, a heating module is provided in the drying box, and the drying device further includes a controller. The controller is respectively electrically connected to the circulation fan and the heating module.

[0021] During use, the internal space of the drying box is heated by a heating module. The negative electrode sheet of the lithium battery to be dried enters from the feed port, passes through the high-temperature area formed by heating, and is discharged from the discharge port. In the high-temperature area, the negative electrode sheet of the lithium battery to be dried is dried. At the same time, the high-temperature and humid air in the drying box is extracted by a circulation fan and a circulation pipe, and after dehydration, it returns to the inlet end of the drying box again.

[0022] Compared with the prior art, the present application can timely discharge the high-temperature and humid air generated during drying from the drying box, thereby avoiding the accumulation of a large amount of hot and humid air in the drying box, which may cause the dried negative electrode sheet of the lithium battery to be re-wetted. While ensuring the drying quality, it avoids repeated drying and improves the drying efficiency.

[0023] Secondly, during the drying process, hot air is extracted from the tail of the drying box and returns to the inlet end after dehydration. On the one hand, it is beneficial to reduce the temperature on the outlet end side of the drying box, thereby realizing heat recovery and rapid cooling of the negative electrode sheet of the lithium battery at the same time. On the other hand, the heat entering the inlet end will preheat the negative electrode sheet of the lithium battery to be dried at the inlet end of the drying box. While avoiding cracking of the negative electrode material caused by rapid temperature changes, it ensures that the best drying temperature can be reached faster in the drying box, thereby shortening the heating time and being beneficial to improving the drying efficiency and drying quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a drying device for the negative electrode sheet of a lithium battery provided in Embodiment 1 of the present application;

[0025] Figure 2 It is a cross-sectional view of a drying device for the negative electrode sheet of a lithium battery provided in Embodiment 1 of the present application;

[0026] Figure 3 It is a schematic structural diagram of a dehydration tank;

[0027] Figure 4 It is a schematic structural diagram of another alternative embodiment provided by the present application;

[0028] Reference numerals: 1 - drying box, 2 - feed port, 3 - discharge port, 4 - circulation pipe, 5 - circulation fan, 6 - first partition board, 7 - second partition board, 8 - conveying trough, 9 - preheating area, 10 - drying area, 11 - cooling area, 12 - temperature sensor, 13 - first humidity detection module, 14 - second humidity detection module, 15 - shunt pipe, 16 - confluence pipe, 17 - dehydration branch pipe, 18 - dehydration tank, 19 - air inlet, 20 - exhaust port, 21 - filter screen, 22 - dehydrating agent, 23 - filling port, 24 - sealing plate, 25 - connecting screw, 26 - connecting hole, 27 - fixing nut, 28 - sealing strip, 29 - electric heating plate.

[0029] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0034] Embodiment 1

[0035] Refer to Figures 1 to 4, As an alternative embodiment of the present application, this embodiment discloses a drying device for the negative electrode sheet of a lithium battery, including a drying box 1 and a controller. The drying box 1 has a rectangular structure. Along the length direction of the drying box 1, a feed inlet 2 is provided at one end, and a discharge outlet 3 is provided at the other end. It should be noted that on the premise of ensuring the smooth entry and exit of the lithium battery negative electrode sheet to be dried, the openings of the feed inlet 2 and the discharge outlet 3 should be as small as possible to reduce heat loss and improve the thermal efficiency of the entire device;

[0036] A first partition board 6 and a second partition board 7 are further provided in the drying box 1. Along the length direction of the drying box 1, the first partition board 6 and the second partition board 7 are arranged in sequence. Conveyor grooves 8 are provided on both the first partition board 6 and the second partition board 7. The feed inlet 2, each conveyor groove 8 and the discharge outlet 3 are located in the same plane;

[0037] Along the material flow direction, the first partition board 6 and the second partition board 7 divide the drying box 1 into a preheating zone 9, a drying zone 10 and a cooling zone 11;

[0038] At the same time, in order to improve the smoothness of air flow and thus quickly discharge high-temperature water vapor, a number of ventilation holes are provided on both the first partition board 6 and the second partition board 7;

[0039] Temperature sensors 12 are provided in the preheating zone 9, the drying zone 10 and the cooling zone 11. The controller includes an industrial computer and a PLC. The industrial computer is communicatively connected to the PLC through a data line. Each temperature sensor 12 is electrically connected to the PLC;

[0040] A heating module is further provided in the drying zone 10 of the drying box 1. The heating module is preferably an electric heating plate 29. It should be noted that heating modules are provided on the inner walls of each part of the drying zone 10. Each heating module is electrically connected to the PLC in parallel to improve the reliability and stability of the heating module;

[0041] Furthermore, a circulation pipe 4 is provided on the drying box 1. One end of the circulation pipe 4 is an air inlet, and the other end is provided with an air outlet. Along the air flow direction, a circulation fan 5 and a dehydration module are sequentially provided on the circulation pipe 4;

[0042] The circulating fan 5 is electrically connected to the PLC. At the same time, a frequency converter can be additionally installed between the circulating fan 5 and the PLC. Through the frequency converter, the rotation speed of the circulating fan 5 can be controlled more accurately, and then the circulating air volume can be controlled more precisely. On the one hand, it ensures the stability of the temperature in the drying box 1 and avoids excessive heat output. On the other hand, by controlling the circulating air volume, the steam volume in the drying box 1 can be effectively controlled, thereby adjusting the humidity in the drying box 1 and avoiding cracking of the negative electrode material during drying due to too low humidity, ensuring the structural stability of the lithium battery negative electrode sheet.

[0043] The air inlet of the circulating pipe 4 is communicated with the cooling area 11 of the drying box 1, and the air outlet is communicated with the preheating area 9 of the drying box 1;

[0044] Further, the dehydration module includes a dehydration tank 18. An air inlet 19 and an air outlet 20 are provided on the dehydration tank 18, and filter meshes 21 are provided on both the air inlet 19 and the air outlet 20; The dehydration agent is filled in the dehydration tank 18, and the dehydration agent is preferably silica gel or activated alumina;

[0045] A loading port 23 is further provided at the top of the dehydration tank 18. Along the edge of the loading port 23, a plurality of connecting screws 25 are provided on the top surface of the dehydration tank 18. A sealing plate 24 is also provided on the dehydration tank 18, and a plurality of connecting holes 26 are provided on the sealing plate 24. Each of the connecting screws 25 is inserted and connected to each of the connecting holes 26, and fixing nuts 27 are provided on each of the connecting screws 25;

[0046] At the same time, a sealing strip 28 is also provided on the sealing plate 24, and the sealing strip 28 fits with the top surface of the dehydration tank 18;

[0047] Through the above technical measures, the sealing effect of the loading port 23 can be effectively improved, gas leakage can be avoided, and at the same time, it is also convenient to replace and load the dehydration agent.

[0048] Further, the drying device further includes a first humidity detection module 13 and a second humidity detection module 14. The first humidity detection module 13 is arranged at the inlet end of the dehydration module, and the second humidity detection module 14 is arranged at the outlet end of the dehydration module; The first humidity detection module 13 and the second humidity detection module 14 are respectively electrically connected to the controller;

[0049] Both the first humidity detection module 13 and the second humidity detection module 14 include at least one humidity sensor;

[0050] During use, the water content of the air at the inlet and outlet ends of the dehydration module is detected by the humidity sensor. On the one hand, it can confirm whether the dehydration module can perform effective dehydration work, ensure the stable and continuous operation of the entire system, and issue an early warning in a timely manner when the dehydration module is in a saturated state. On the other hand, through the above technical measures, the water content of the hot air flowing back into the drying oven 1 can be effectively monitored, and then the water vapor in the drying oven 1 can be adjusted to avoid excessive humidity in the drying oven 1, thereby avoiding secondary drying and improving the drying efficiency.

[0051] Furthermore, the drying device further includes a shunt pipe 15, a confluence pipe 16, and a plurality of dehydration branch pipes 17. A dehydration tank 18 is provided on each of the dehydration branch pipes 17; the inlet ends of the dehydration branch pipes 17 are respectively connected in parallel with the shunt pipe 15, and the inlet end of the shunt pipe 15 is connected to the cooling zone 11 of the drying oven 1 through a circulation pipe 4. The outlet ends of the dehydration branch pipes 17 are respectively connected in parallel with the confluence pipe 16, and the outlet end of the confluence pipe 16 is connected to the preheating zone 9 of the drying oven 1 through a circulation pipe 4;

[0052] When there are multiple dehydration branch pipes 17, both the first humidity detection module 13 and the second humidity detection module 14 include humidity sensors with the same number as the dehydration branch pipes 17. A humidity sensor is provided at both the inlet and outlet ends of each dehydration branch pipe 17, so as to monitor the dehydration state of each dehydration tank 18.

[0053] Compared with the prior art, the present application can timely discharge the high-temperature and humid air generated by drying from the drying oven, thereby avoiding the accumulation of a large amount of hot and humid air in the drying oven, causing the dried negative electrode sheets of lithium batteries to be wetted again. While ensuring the drying quality, it avoids repeated drying and improves the drying efficiency.

[0054] Secondly, during the drying process, the hot air is extracted from the tail of the drying oven and returns to the inlet end after dehydration. On the one hand, it is beneficial to reduce the temperature on the outlet end side of the drying oven, thereby realizing heat recovery while quickly cooling the negative electrode sheets of lithium batteries; on the other hand, the heat entering the inlet end will preheat the negative electrode sheets of lithium batteries to be dried at the inlet end of the drying oven, avoiding cracking of the negative electrode material due to rapid temperature changes, while ensuring that the best drying temperature can be reached faster in the drying oven, thereby shortening the heating time and being beneficial to improving the drying efficiency and drying quality.

[0055] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A drying device for the negative electrode sheet of a lithium battery, characterized in that, It includes a drying box (1). Along the length direction of the drying box (1), one end of the drying box (1) is provided with a feed inlet (2), and the other end is provided with a discharge outlet (3). A circulation pipe (4), one end of the circulation pipe (4) is an air inlet, and the other end is provided with an air outlet; a circulation fan (5) is also provided on the circulation pipe (4); the air inlet is connected to one end of the discharge outlet (3) of the drying box (1), and the air outlet is connected to one end of the feed inlet (2) of the drying box (1). A dehydration module, which is arranged on the circulation pipe (4). A heating module, which is arranged in the drying box (1). A controller, which is electrically connected to the circulation fan (5) and the heating module respectively.

2. The drying device for the negative electrode sheet of a lithium battery according to claim 1, characterized in that, A first partition plate (6) and a second partition plate (7) are arranged in the drying box (1), and conveying grooves (8) are arranged on both the first partition plate (6) and the second partition plate (7); along the material flow direction, the first partition plate (6) and the second partition plate (7) divide the drying box (1) into a preheating area (9), a drying area (10) and a cooling area (11).

3. The drying device for the negative electrode sheet of a lithium battery according to claim 2, wherein, Temperature sensors (12) are arranged in the preheating area (9), the drying area (10) and the cooling area (11), and each of the temperature sensors (12) is electrically connected to the controller respectively.

4. A drying device for a negative electrode sheet of a lithium battery according to claim 1, characterized in that, The drying device further includes a first humidity detection module (13) and a second humidity detection module (14). The first humidity detection module (13) is arranged at the inlet end of the dehydration module, and the second humidity detection module (14) is arranged at the outlet end of the dehydration module; the first humidity detection module (13) and the second humidity detection module (14) are electrically connected to the controller respectively.

5. A drying device for the negative electrode sheet of a lithium battery according to claim 1, characterized in that, The drying device further includes a shunt pipe (15), a confluence pipe (16) and a plurality of dehydration branch pipes (17). Dehydration modules are arranged on each of the dehydration branch pipes (17); the inlet ends of each of the dehydration branch pipes (17) are respectively connected in parallel with the shunt pipe (15), and the outlet ends of each of the dehydration branch pipes (17) are respectively connected in parallel with the confluence pipe (16).

6. A drying device for a negative electrode sheet of a lithium battery according to claim 1 or 5, characterized in that, The dehydration module includes a dehydration tank (18). An air inlet (19) and an exhaust port (20) are arranged on the dehydration tank (18), and filter meshes (21) are arranged on both the air inlet (19) and the exhaust port (20); a dehydrating agent is filled in the dehydration tank (18).

7. The drying device for the negative electrode sheet of a lithium battery according to claim 6, characterized in that, A loading port (23) is further arranged at the top of the dehydration tank (18), and a sealing plate (24) for closing the loading port (23) is connected to the dehydration tank (18).

8. A drying device for the negative electrode sheet of a lithium battery according to claim 7, characterized in that, Along the edge of the loading port (23), a plurality of connecting screws (25) are arranged on the dehydration tank (18), a plurality of connecting holes (26) are arranged on the sealing plate (24), each of the connecting screws (25) is inserted and connected to each of the connecting holes (26), and fixing nuts (27) are arranged on each of the connecting screws (25).

9. The drying device for the negative electrode sheet of a lithium battery according to claim 8, wherein, A sealing strip (28) is further arranged on the sealing plate (24), and the sealing strip (28) fits with the top surface of the dehydration tank (18).

10. A drying device for a negative electrode sheet of a lithium battery according to claim 1, characterized in that, The controller includes an industrial computer and a PLC, and the industrial computer is communicatively connected to the PLC through a data line.

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