Drying device with uniform drying function for lithium battery processing

Abstract

The utility model relates to the technical field of lithium battery drying, and discloses a drying device for lithium battery processing, which is uniform in drying and comprises a drying box and heat conducting plates, the heat conducting plates are transversely fixed at the upper part, the lower part and the middle position in the drying box, and electric heating plates are embedded and fixed in the heat conducting plates. A plurality of longitudinal slots are equidistantly formed in the upper surface of the lower heat conducting plate and the upper and lower surfaces of the middle heat conducting plate; and copper plates are vertically arranged between the upper and lower adjacent heat conducting plates. According to the technical scheme of the utility model, the plurality of longitudinally arranged slots are arranged on the surface of the heat conducting plate at equal intervals, the copper plate can be connected between the upper heat conducting plate and the lower heat conducting plate by inserting the insertion strips into the slots, and the connection position can be changed according to the size of the lithium battery; the copper plates can conduct heat well, so that the bottom and the two sides of the lithium battery have good heat sources, and the lithium battery is evenly heated and dried.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery drying technology, specifically a drying device for processing lithium batteries that provides uniform drying. Background Technology

[0002] Lithium-ion batteries use lithium metal or lithium alloy as electrode materials and are divided into primary batteries (such as lithium manganese batteries) and secondary batteries (such as lithium-ion batteries). In secondary batteries, lithium ions are reversibly inserted / extracted between the positive and negative electrodes to achieve charging and discharging. Common positive electrodes include lithium cobalt oxide and ternary materials, while the negative electrode is mostly graphite. They have advantages such as high energy density, long cycle life, and low self-discharge, and are widely used in mobile phones, electric vehicles, energy storage and other fields. However, their safety (overcharging easily causes heat generation) and cost need to be continuously optimized. Before the electrolyte is injected into the cells, lithium battery production requires drying. The moisture inside the cells must be controlled at an extremely low level. Otherwise, the moisture will react with the electrolyte to form hydrofluoric acid, which will corrode the internal structure of the battery and reduce battery performance.

[0003] Existing technologies typically employ vacuum drying. However, due to the extremely low air content in a near-vacuum environment, it is difficult to achieve uniform heating of lithium batteries through heat convection within the drying oven. Furthermore, it is challenging to maintain a close and uniform distance between lithium batteries of different sizes and the heat source for even heating, resulting in uneven heating and inconsistent drying. Therefore, we propose a drying apparatus for lithium battery processing that ensures uniform drying. Utility Model Content

[0004] The purpose of this invention is to provide a drying device for processing lithium batteries that achieves uniform drying. Multiple longitudinally arranged slots are equidistantly arranged on the surface of the heat-conducting plate. Copper plates are connected between the upper and lower heat-conducting plates by inserting strips into the slots. The connection position can be changed according to the size of the lithium battery, ensuring that there are copper plates close to both sides of the lithium battery. The copper plates provide good heat conduction, ensuring a good heat source at the bottom and sides of the lithium battery, allowing the lithium battery to be uniformly heated and dried, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a drying device for processing lithium batteries with uniform drying, comprising a drying chamber and a heat-conducting plate. The heat-conducting plate is horizontally fixed at the upper, lower, and middle positions inside the drying chamber, and an electric heating plate is embedded and fixed inside the heat-conducting plate. Multiple longitudinal slots are equidistantly provided on the bottom surface of the upper heat-conducting plate, the upper surface of the lower heat-conducting plate, and the upper and lower surfaces of the middle heat-conducting plate. A copper plate is also provided vertically between the upper and lower adjacent heat-conducting plates, and the copper plate is connected between the upper and lower adjacent heat-conducting plates by inserting the insert strip at the end of the copper plate into the slot. The back of the drying chamber is provided with two air extraction ports communicating with the interior of the drying chamber, and the rear end of the drying chamber is provided with a vertical air extraction pipe communicating with the two air extraction ports. A sealable door is also installed at the front end of the drying chamber.

[0006] By adopting the above technical solution, after the lithium battery is evenly supported on the surface of the bottom or middle heat-conducting plate, copper plates are set on both sides of each lithium battery, and the copper plates are connected between the upper and lower heat-conducting plates close to the lithium battery. The heat from the working electric heating plate will be transferred to the heat-conducting plate and the copper plate, so that the bottom and both sides of the lithium battery have a good heat source, achieving the purpose of uniformly heating and drying the lithium battery.

[0007] Optionally, two storage slots are fixed on both sides of the drying oven.

[0008] By adopting the above technical solution, unused copper plates can be stored in a storage slot.

[0009] Optionally, a one-way valve is installed on the suction pipe, with the one-way valve opening in one direction upwards.

[0010] By adopting the above technical solution, negative pressure suction from the extraction pipe is avoided when the vacuum pump unit stops.

[0011] Optionally, a balance pipe is connected to the side of the air extraction pipe below the one-way valve, and a valve is installed on the balance pipe.

[0012] By adopting the above technical solution, after drying is completed, the balance pipe can be opened to balance the internal and external air pressure of the drying chamber.

[0013] Optionally, a filter screen is fixed inside the air extraction port.

[0014] By adopting the above technical solution, impurities inside the drying oven are prevented from being drawn into the extraction pipe through the extraction port.

[0015] Optionally, temperature sensors are installed on both inner wall surfaces of the drying oven, and multiple temperature sensors are provided.

[0016] By adopting the above technical solution, the internal temperature of the drying chamber is monitored in real time by a temperature sensor during the drying process.

[0017] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0018] 1. The technical solution of this application has multiple longitudinally arranged slots equidistantly arranged on the surface of the heat-conducting plate. The copper plate can be connected between the upper and lower heat-conducting plates by inserting the insert into the slot. The connection position can be changed according to the size of the lithium battery to ensure that there are copper plates close to both sides of the lithium battery. The copper plate can conduct heat well so that the bottom and both sides of the lithium battery have a good heat source, so that the lithium battery is heated and dried evenly.

[0019] 2. The technical solution of this application has storage slots fixed on both sides of the drying box, where excess unused copper plates can be stored for easy retrieval during subsequent use. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the drying device for processing lithium batteries that provides uniform drying according to this utility model.

[0022] Figure 2 This is a schematic diagram of the internal structure of the drying device for processing lithium batteries that provides uniform drying according to this utility model.

[0023] Figure 3 This is a schematic diagram of the connection structure between the copper plate and the heat-conducting plate of the drying device for processing lithium batteries, which provides uniform drying according to this utility model.

[0024] In the diagram: 1. Drying oven; 11. Air extraction port; 111. Filter screen; 12. Door; 13. Storage slot; 14. Temperature sensor; 2. Heat-conducting plate; 21. Heating plate; 22. Slot; 3. Copper plate; 31. Insert strip; 4. Air extraction pipe; 41. One-way valve; 42. Balance pipe; 421. Valve. Detailed Implementation

[0025] Please see Figure 1-3 This utility model provides a technical solution: a drying device for processing lithium batteries with uniform drying, including a drying chamber 1 and a heat-conducting plate 2. The front end of the drying chamber 1 is equipped with a sealable door 12. When the door 12 is closed and locked, the interior of the drying chamber 1 can be sealed. The back of the drying chamber 1 is provided with two air extraction ports 11 that communicate with the interior of the drying chamber 1, and the rear end of the drying chamber 1 is provided with a vertical air extraction pipe 4 that communicates with the two air extraction ports 11. In use, the vacuum pump group is connected to the air extraction pipe 4. When the interior of the drying chamber 1 is sealed, the vacuum pump group is started, and the interior of the drying chamber 1 can be evacuated to a near-vacuum state through the air extraction pipe 4.

[0026] A filter screen 111 is fixed inside the air extraction port 11. When the vacuum pump unit is working, it prevents impurities inside the drying chamber 1 from being drawn into the air extraction pipe 4 through the air extraction port 11. A one-way valve 41 is also installed on the air extraction pipe 4. The one-way valve 41 is open in one direction upwards. When the vacuum pump unit stops working, it prevents negative pressure from the air extraction pipe 4 from generating negative pressure suction on the vacuum pump unit. In addition, a balance pipe 42 is connected to the side of the air extraction pipe 4 below the one-way valve 41. A valve 421 is installed on the balance pipe 42. After the drying work is completed, the valve 421 of the balance pipe 42 can be opened first, and external air can enter the drying chamber 1 through the balance pipe 42 to balance the internal and external air pressure of the drying chamber 1, thereby ensuring that the chamber door 12 can be opened smoothly.

[0027] Three heat-conducting plates 2 are provided. The heat-conducting plates 2 are horizontally fixed inside the drying oven 1 at the top, bottom and middle positions. The two air extraction ports 11 mentioned above are located between the top heat-conducting plate 2 and the middle heat-conducting plate 2 and between the middle heat-conducting plate 2 and the bottom heat-conducting plate 2, respectively. An electric heating plate 21 is embedded and fixed inside the heat-conducting plate 2. Multiple vertical slots 22 are equally spaced on the bottom surface of the top heat-conducting plate 2, the top surface of the bottom heat-conducting plate 2 and the top and bottom surfaces of the middle heat-conducting plate 2. A copper plate 3 is also provided vertically between the upper and lower adjacent heat-conducting plates 2. The copper plate 3 is connected between the upper and lower adjacent heat-conducting plates 2 by inserting the insert strip 31 at the end of the copper plate 3 into the slot 22.

[0028] Since the slots 22 on the surface of the heat-conducting plate 2 are evenly distributed, when the lithium batteries to be dried are evenly supported and placed on the surface of the bottom or middle layer of the heat-conducting plate 2, according to the size of the lithium batteries, copper plates 3 are vertically placed on both sides of each lithium battery close to the side of the lithium battery. The copper plates 3 are inserted into the vertical slots 22 on the bottom of the upper heat-conducting plate 2 and the upper surface of the lower heat-conducting plate 2 respectively through the inserts 31, so that the copper plates 3 are vertically locked on both sides of the lithium battery. The copper plates 3 are close to both sides of the lithium battery. When the heating plate 21 is activated, the heat-conducting plate 2 is heated, and the heat of the heat-conducting plate 2 is also transferred to the surface of the copper plates 3, so that the bottom and sides of each lithium battery can be evenly heated by the heat-conducting plate 2 and the copper plates 3, which can achieve the purpose of evenly heating and drying the lithium batteries. In order to save the amount of copper plates 3 used, adjacent lithium batteries can share one copper plate 3.

[0029] In addition, temperature sensors 14 are installed on both sides of the inner wall surface of the drying oven 1. Multiple temperature sensors 14 are provided so that the temperature inside the drying oven 1 can be monitored in real time during use.

[0030] Both sides of the drying oven 1 are fixed with storage slots 13. There are two storage slots 13. Excess unused copper plates 3 can be placed in the storage slots 13 for easy access later.

[0031] In use, connect the suction pipe 4 to the vacuum pump assembly. The vacuum pump assembly, temperature sensor 14, and heating plate 21 are all connected to the industrial control computer. After opening the chamber door 12, first remove all the copper plates 3. Evenly support and place the lithium batteries to be dried on the surface of the bottom or middle heat-conducting plate 2. Then, according to the size of the lithium batteries, place copper plates 3 vertically on both sides of each lithium battery, close to the side of the lithium battery. To save on the amount of copper plates 3 used, adjacent lithium batteries can share one copper plate 3. The copper plates 3 are inserted into the vertical slots 22 on the bottom and top surfaces of the upper and lower heat-conducting plates 2, respectively, through inserts 31, so that the copper plates 3 are vertically locked on both sides of the lithium batteries and connected between the upper and lower heat-conducting plates 2. Then close the chamber door 12 and... After sealing and locking the chamber, the vacuum pump unit is first started to draw air from the inside of the drying chamber 1 to a near-vacuum environment through the suction pipe 4 and suction port 11. Then, the electric heating plate 21 is started to heat the heat conduction plate 2. The heat from the heat conduction plate 2 is also transferred to the surface of the copper plate 3, so that the bottom and sides of each lithium battery can be evenly heated through the heat conduction plate 2 and the copper plate 3. This achieves the purpose of uniformly heating and drying the lithium batteries. The water vapor generated during drying is directly drawn away by the vacuum pump unit. After drying is completed, the vacuum pump unit is stopped to stop the suction, and the electric heating plate 21 is stopped. After opening the valve 421 on the balance pipe 42, external air can enter the drying chamber 1 through the balance pipe 42 to balance the air pressure. Then, the chamber door 12 can be opened to remove the dried lithium batteries for subsequent liquid injection.

Claims

1. A drying apparatus for processing lithium batteries to achieve uniform drying, comprising a drying chamber (1) and a heat-conducting plate (2), characterized in that: The heat-conducting plate (2) is horizontally fixed inside the drying oven (1) at the top, bottom and middle positions, and an electric heating plate (21) is embedded and fixed inside the heat-conducting plate (2). Multiple longitudinal slots (22) are equally spaced on the bottom surface of the upper heat-conducting plate (2), the upper surface of the lower heat-conducting plate (2) and the upper and lower surfaces of the middle heat-conducting plate (2). A copper plate (3) is also provided vertically between the upper and lower adjacent heat-conducting plates (2). The copper plate (3) is connected between the upper and lower adjacent heat-conducting plates (2) by inserting the insert (31) at the end of the copper plate (3) into the slot (22). The back of the drying box (1) is provided with two air extraction ports (11) that communicate with the interior of the drying box (1). The rear end of the drying box (1) is provided with an air extraction pipe (4) that communicates with the two air extraction ports (11). The front end of the drying box (1) is also provided with a sealable door (12).

2. The drying apparatus for processing lithium batteries with uniform drying according to claim 1, characterized in that: The drying box (1) has two storage slots (13) fixed on both sides of its surface.

3. The drying apparatus for processing lithium batteries with uniform drying according to claim 1, characterized in that: A one-way valve (41) is installed on the air extraction pipe (4), and the one-way valve (41) is open in one direction upwards.

4. The drying apparatus for processing lithium batteries with uniform drying according to claim 3, characterized in that: A balance pipe (42) is connected to the side of the air extraction pipe (4) below the one-way valve (41), and a valve (421) is installed on the balance pipe (42).

5. The drying apparatus for processing lithium batteries with uniform drying according to claim 1, characterized in that: A filter screen (111) is fixed inside the air extraction port (11).

6. The drying apparatus for processing lithium batteries with uniform drying according to claim 1, characterized in that: Temperature sensors (14) are installed on both inner walls of the drying oven (1), and multiple temperature sensors (14) are provided.

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