High vacuum drying device for long-life lossless pole piece

Abstract

The utility model relates to the technical field of battery pole piece processing, in particular to a high-vacuum drying device for a long-life lossless pole piece, which comprises a drying box, a processing cavity is arranged in the drying box, infrared heating tubes are arranged on the inner wall of the processing cavity, a molecular pump is arranged on the rear side wall of the drying box, and the molecular pump is connected with the processing cavity. A control mechanism is arranged on the upper side wall of the drying box, a liquid nitrogen spray head device is arranged on the upper side wall of the processing cavity, a sealing door capable of being opened and closed is arranged on the front side wall of the processing cavity, the control mechanism comprises a protection box, an operation motor, a control rod and a sliding block, and the liquid nitrogen spray head device comprises a spray head with an output pump, an output pipe and a liquid nitrogen bottle. Grooves are formed in the two side walls of the processing cavity, placing plates are arranged in the grooves, local overheating or thermal stress concentration caused by traditional contact type heating is avoided, the integrity of the microstructure of the pole piece in the drying process is ensured, gradient cooling and precise solvent residue control are achieved, and the drying period is shortened.

Description

Technical Field

[0001] This utility model relates to the field of battery electrode processing technology, specifically a high-vacuum drying device for long-life, non-destructive electrode sheets. Background Technology

[0002] As is well known, in the existing lithium-ion battery electrode manufacturing field, high-vacuum drying process is the core link to ensure the bonding strength between electrode material and current collector interface. Traditional drying equipment generally suffers from defects such as mechanical contact damage and poor vacuum stability, which directly affect the cycle life and safety performance of the electrode.

[0003] Specifically, most equipment relies on chain conveyor belts to carry the electrodes. During the transmission process, the electrodes rub against hard surfaces, causing the active material to fall off. At the same time, the cooling system relies on air-cooled or water-cooled coils, which have a slow cooling rate, and airflow disturbances can easily cause the electrodes to shift or warp. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a high-vacuum drying device for long-life, non-destructive electrode sheets.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-vacuum drying device for long-life, non-destructive electrode sheets, comprising a drying chamber, a processing chamber provided inside the drying chamber, infrared heating tubes provided on the inner walls of the processing chamber, a molecular pump provided on the rear side wall of the drying chamber, the output end of the molecular pump penetrating through the processing chamber, a control mechanism provided on the upper side wall of the drying chamber, a liquid nitrogen nozzle device provided on the upper side wall of the processing chamber, the liquid nitrogen nozzle device being connected to the control mechanism, and a sealable door that can be opened and closed provided on the front side wall of the processing chamber.

[0008] To achieve precise movement control of the liquid nitrogen nozzle, this utility model improves upon the following: the control mechanism includes a protective box, a running motor, a control rod, and a slider. The protective box is located on the upper side wall of the drying chamber, the running motor is located on one side wall of the protective box, the control rod passes through the protective box, the slider is on the control rod and threadedly connected to it, one end of the control rod is connected to the output end of the running motor, the slider is fitted against the inner side of the protective box, and the upper side wall of the protective box has a through opening.

[0009] To achieve precise cooling control of the electrode, the present invention includes the following improvements: the liquid nitrogen nozzle device includes a spray head with an output pump, an output pipe and a liquid nitrogen bottle. The spray head is located on the upper side of the processing chamber. The output end of the output pipe passes through the slider and is connected to the upper end of the spray head. The liquid nitrogen bottle is connected to the other end of the output pipe.

[0010] To facilitate the placement and removal of electrode sheets, the present invention is improved as follows: the two side walls of the processing cavity are provided with grooves, and a placement plate is provided in the grooves. The two side walls of the placement plate penetrate the grooves and are slidably connected to them.

[0011] To facilitate real-time monitoring and adjustment of drying parameters by operators, the present invention is improved by providing a control panel and mechanical buttons on one end of the front side wall of the drying chamber.

[0012] To make the heating more uniform and avoid local overheating, the present invention is improved in that the infrared heating tubes are arranged in a ring array on the inner wall of the processing cavity, and the radiating surface is covered with an alumina ceramic protective layer.

[0013] To improve the vacuum retention capability of the sealing door, the present invention features the following improvement: the sealing door adopts a double-lip metal sealing ring.

[0014] To facilitate observation of the electrode drying state, the present invention is improved by providing an observation window on the sealed door.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a high-vacuum drying device for long-life, non-destructive electrode sheets, which has the following beneficial effects:

[0017] This high-vacuum drying device for long-life, non-destructive electrodes is equipped with an infrared heating tube, combined with an alumina ceramic protective layer, to achieve uniform coverage of radiative heating on the electrode surface. This avoids localized overheating or thermal stress concentration caused by traditional contact heating, effectively preventing coating cracking and active material detachment, and ensuring the integrity of the electrode's microstructure during the drying process.

[0018] Equipped with a control mechanism, the motor output drives the control lever to rotate, thereby driving the slider to move the liquid nitrogen nozzle linearly above the processing chamber. The cooling area and spray intensity can be adjusted in real time according to the electrode drying process, solving the problems of insufficient coverage or overcooling damage caused by traditional fixed nozzles. It achieves precise control of gradient cooling and solvent residue, avoiding brittle fracture of materials or backflow of binder.

[0019] The molecular pump and the double-lip metal seal gate work together to maintain a high vacuum environment in the processing chamber during the high-temperature drying and low-temperature cooling stages, eliminating the risk of leakage caused by thermal expansion and contraction of traditional rubber seals, ensuring unobstructed solvent evaporation path, and shortening the drying cycle. Attached Figure Description

[0020] Figure 1 This is a first-view schematic diagram of the structure of this utility model;

[0021] Figure 2This is a second-view schematic diagram of the structure of this utility model;

[0022] Figure 3 This is a partial schematic diagram of the structure of this utility model from a third-view perspective;

[0023] Figure 4 This is a partial schematic diagram of the structure of this utility model from a fourth perspective.

[0024] In the diagram: 1. Drying oven; 2. Protective box; 3. Running motor; 4. Output pipe; 5. Control panel; 6. Sealed door; 7. Mechanical button; 8. Liquid nitrogen bottle; 9. Molecular pump; 10. Placement plate; 11. Spray head; 12. Control lever; 13. Slider; 14. Processing chamber. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Please see Figure 1-4A high-vacuum drying device for long-life, non-destructive electrode sheets includes a drying chamber 1, a processing chamber 14 inside the drying chamber 1, infrared heating tubes installed on the inner walls of the processing chamber 14, a molecular pump 9 installed on the rear wall of the drying chamber 1, the output end of the molecular pump 9 penetrating through the processing chamber 14, a control mechanism installed on the upper wall of the drying chamber 1, a liquid nitrogen nozzle device installed on the upper wall of the processing chamber 14, the liquid nitrogen nozzle device being connected to the control mechanism, a slugable sealing door 6 installed on the front wall of the processing chamber 14, and the liquid nitrogen nozzle device including a spray head 1 with an output pump. 1. Output pipe 4 and liquid nitrogen bottle 8. The spray head 11 is located on the upper side of the processing chamber 14. The output end of the output pipe 4 passes through the slider 13 and is connected to the upper end of the spray head 11. The liquid nitrogen bottle 8 is connected to the other end of the output pipe 4. Grooves are provided on both sides of the processing chamber 14. A placement plate 10 is provided in the groove. The two sides of the placement plate 10 pass through the groove and are slidably connected to it. A control panel 5 and mechanical buttons 7 are provided on one side of the drying chamber 1. The infrared heating tubes are arranged in a ring array on the inner wall of the processing chamber 14, and the radiating surface is covered with an alumina ceramic protective layer.

[0029] During operation, the operator lays the electrode to be dried flat on the surface of the placement plate 10, and pushes the placement plate 10 horizontally into the cavity along the grooves on both sides of the processing cavity 14. The electrode only contacts the alumina ceramic coating of the placement plate 10 throughout the process, avoiding coating damage caused by mechanical clamping or conveyor belt friction. After the placement plate 10 is fully inside the processing cavity 14, the sealing door 6 is closed to form a vacuum seal interface. Parameters such as drying temperature (usually 80-120℃), target vacuum value (≤10-3Pa), liquid nitrogen spraying cycle, and moving speed are input through the control panel 5 and mechanical buttons 7. Upon receiving the signal, the molecular pump 9 starts, continuously extracting air molecules from the processing cavity 14 through the molecular-level gas momentum transfer between the high-speed turbine rotor and stator until the set vacuum degree is reached. At this time, the infrared heating tube is powered on. The alumina ceramic protective layer covering its surface converts electrical energy into far-infrared radiation, which penetrates the electrode coating in a non-contact manner to achieve uniform heating inside the material, eliminating the temperature gradient caused by traditional heat conduction. When the infrared heating causes the electrode temperature to reach a preset threshold, the control mechanism is automatically activated, driving the cryogenic liquid nitrogen (-196℃) in the liquid nitrogen bottle 8 to be pressurized by the output pump and delivered to the spray head 11 through the insulated output pipe 4, forming an atomized liquid nitrogen flow. During the movement of the spray head, the liquid nitrogen covers the electrode surface in a fan-shaped diffusion pattern. Combined with the rapid vaporization and heat absorption in the vacuum environment, a dynamic gradient cooling zone is formed. The control panel 5 monitors the temperature distribution of the cavity in real time and adjusts the spray head movement speed and liquid nitrogen flow rate through a PID algorithm to ensure that the cooling rate of each area of ​​the electrode is consistent, avoiding material embrittlement or solvent residue caused by local overcooling.

[0030] In practical use, precise movement control of the liquid nitrogen nozzle is required to improve cooling uniformity. To meet these requirements, in this embodiment, the control mechanism includes a protective box 2, a running motor 3, a control rod 12, and a slider 13. The protective box 2 is located on the upper side wall of the drying chamber 1, the running motor 3 is located on one side wall of the protective box 2, the control rod 12 passes through the protective box 2, and the slider 13 is threaded onto and connected to the control rod 12. One end of the control rod 12 is connected to the output end of the running motor 3, and the slider 13 fits against the inner side of the protective box 2. A through opening is provided on the upper side wall of the protective box 2.

[0031] The control mechanism is activated. After receiving the signal, the motor 3 starts and drives the control lever 12 to rotate. Through the precision transmission that meshes with the threaded slider 13, the slider 13 moves under the limit of the protective box 2, thereby driving the liquid nitrogen nozzle to move at a constant speed along the length of the processing cavity 14.

[0032] In practical use, it is necessary to improve the vacuum retention capacity of the sealing door 6 to ensure the stability of the dry environment. To meet the above requirements, in this embodiment, the sealing door 6 adopts a double-lip metal sealing ring.

[0033] The double-lip metal seal ring fits tightly under pressure, thereby improving the sealing effect.

[0034] In actual use, it is necessary to be able to observe the dryness of the electrode. In order to meet the above requirements, in this embodiment, the sealing door 6 is provided with an observation window.

[0035] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high vacuum drying apparatus for long life non-destructive electrode, comprising a drying chamber (1), characterized in that: The drying box (1) is provided with a processing cavity (14), the inner wall of the processing cavity (14) is provided with an infrared heating pipe, the rear wall of the drying box (1) is provided with a molecular pump (9), the output end of the molecular pump (9) penetrates the processing cavity (14), the upper wall of the drying box (1) is provided with a control mechanism, the upper wall of the processing cavity (14) is provided with a liquid nitrogen nozzle device, the liquid nitrogen nozzle device is connected with the control mechanism, and the front and side walls of the processing cavity (14) are provided with a sealable sealing door (6).

2. A high vacuum drying device for long life non-destructive test sheets as claimed in claim 1, wherein: The control mechanism comprises a protection box (2), a running motor (3), a control rod (12) and a sliding block (13), the protection box (2) is arranged on the upper wall of the drying box (1), the running motor (3) is arranged on one side wall of the protection box (2), the control rod (12) penetrates the protection box (2), the sliding block (13) is arranged on the control rod (12) and is threadedly connected with the control rod (12), one end of the control rod (12) is connected with the output end of the running motor (3), the sliding block (13) is attached to the inner side of the protection box (2), and the upper wall of the protection box (2) is provided with a penetrating opening.

3. A high vacuum drying apparatus for long life non-destructive test sheets as claimed in claim 2, wherein: The liquid nitrogen nozzle device comprises a spraying head (11) with an output pump, an output pipe (4) and a liquid nitrogen bottle (8), the spraying head (11) is arranged on the upper side of the processing cavity (14), the output end of the output pipe (4) penetrates the sliding block (13) and is connected with the upper end of the spraying head (11), and the liquid nitrogen bottle (8) is connected with the other end of the output pipe (4).

4. A high vacuum drying apparatus for long life non-destructive test sheets as claimed in claim 3, wherein: The two side walls of the processing cavity (14) are provided with grooves, and the grooves are provided with placing plates (10) arranged therein, and the two side walls of the placing plates (10) penetrate the grooves and are slidably connected with the grooves.

5. A high vacuum drying apparatus for long life non-destructive test sheets as claimed in claim 4, wherein: The front and side walls of the drying box (1) are provided with a control panel (5) and a mechanical button (7) at one end.

6. A high vacuum drying apparatus for long life non-destructive test sheets as claimed in claim 5, wherein: The infrared heating pipes are arranged in an annular array on the inner wall of the processing cavity (14) and are covered with an alumina ceramic protective layer.

7. A high vacuum drying apparatus for long life non-destructive test sheets as claimed in claim 6, wherein: The sealing door (6) adopts a double-lip metal sealing ring.

8. A high vacuum drying apparatus for long life non-destructive test sheets as claimed in claim 7, wherein: An observation window is arranged on the sealing door (6).

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