A sealing device for lithium battery production

Abstract

The present invention belongs to the technical field of lithium battery sealing devices, and specifically relates to a sealing device for lithium battery production, including an operation platform and a sealing component installed above the operation platform. A lithium battery housing is placed above the operation platform, and a positioning component is movably installed on the side of the operation platform. The positioning component includes a clamping column, a lifting column movably installed directly above the clamping column, and a mobile air extraction member. By taking the lithium battery housing and inserting it into the internal part of this group of limiting rings, and inserting the battery upper cover into the lifting ring directly above the limiting ring. At this time, the battery upper cover is directly above the lithium battery housing. The air extraction pump starts its suction function to enable the mobile air extraction member to perform the suction work, maintaining a vacuum environment between the lithium battery housing and the battery upper cover. The mobile air extraction member moves and is no longer in the vertical space between the battery upper cover and the lithium battery housing. Under the action of the ultrasonic welding head, the battery upper cover and the lithium battery housing are sealed.

Description

Technical Field

[0001] The present invention belongs to the field of lithium battery sealing devices, and specifically relates to a sealing device for lithium battery production. Background Art

[0002] Battery sealing is a very crucial step in the production process of lithium batteries, which has a vital impact on the battery's sealing performance, safety, and performance stability. Accurately positioning and aligning the battery's upper cover and outer shell to ensure a tight and flat fit between them without misalignment or gaps usually requires the assistance of specialized positioning devices or molds to ensure the consistency and reliability of the sealing.

[0003] A patent document with the publication number CN211507793U discloses a cylindrical lithium battery vacuum sealing device, including a base, a battery case, a placement rack, a card slot, and a placement rack. The top of the placement rack is inserted with a matching battery case, and a card slot is opened at the top of the placement rack. It also includes a moving mechanism and a vacuum sealing mechanism. In this cylindrical lithium battery vacuum sealing device, by starting the electric air pump, the air in the placement hole cavity can be pumped out through the connecting pipe, making the inner cavity of the placement hole in a negative pressure state. The device can pump out the air inside the battery case when installing the battery cover, avoiding the gas occupying the space between the positive and negative electrode plates during formation.

[0004] In traditional technologies, when sealing a lithium battery, it is necessary to align the battery's upper cover and outer shell, and then tightly install and seal the upper cover and outer shell through a sealing device. To ensure an increase in battery capacity and consistency, and to prevent gas expansion and improve battery safety, it is necessary to evacuate the air between the outer shell and the upper cover during battery sealing to form a vacuum environment. However, the vacuum pumping structure in traditional technologies is fixed and will occupy the space between the upper cover and the battery outer shell, thereby affecting the subsequent sealing steps of the upper cover and the battery outer shell.

[0005] Therefore, the present invention provides a sealing device for lithium battery production. Summary of the Invention

[0006] To make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A sealing device for lithium battery production according to the present invention includes an operation platform and a sealing assembly installed above the operation platform. A lithium battery case is placed above the operation platform, and a positioning assembly is movably installed on the side of the operation platform;

[0008] The sealing component includes a lifting component movably installed above the operating platform, and an ultrasonic welding head is installed on the side of the lifting component. The positioning component includes a clamping post and a lifting post movably installed directly above the clamping post. A plurality of limiting rings are connected to the outside of the clamping post through rods. An air extraction pump is installed above the lifting post. A plurality of lifting rings are connected to the outside of the lifting post through rods. The upper cover of the battery is placed inside the lifting ring, and the upper cover of the battery is directly above the corresponding lithium battery housing. A movable air extraction member is movably installed inside the lifting ring, and a battery core component is arranged inside the lithium battery housing.

[0009] Preferably, a sliding groove is formed at the bottom of the operating platform. The positioning component further includes a sliding bottom plate, which is slidably installed inside the sliding groove, and the clamping post is inserted into the sliding bottom plate.

[0010] Preferably, a plurality of telescopic members II are fixedly installed on the outside of the clamping post, and the clamping post is fixedly connected to the limiting ring through the telescopic members II. A plurality of telescopic members I are fixedly installed on the outside of the lifting post, and the lifting post is fixedly connected to the outside of the lifting ring through the telescopic members I. A lifting screw rod is installed below the lifting post, and the lower end of the lifting screw rod is movably installed inside the clamping post.

[0011] Preferably, the telescopic member I includes an end block fixedly installed on the outside of the lifting ring and a telescopic column installed on one side of the end block. A telescopic spring is installed on the outside of the telescopic column, and the distance between the end block and the lifting post is adjusted by the telescopic column and the telescopic spring.

[0012] Preferably, an annular groove is formed inside the lifting ring, and an annular airbag is installed inside the annular groove. Two micro air pumps are arranged on the outside of the movable air extraction member. An inflation ring is further installed inside the lifting ring, and the inflation ring is located below the annular airbag. A plurality of pneumatic telescopic rods are annularly arranged on the side of the inflation ring facing the center of the lifting ring.

[0013] Preferably, the movable air extraction member includes an air extraction member I and an air extraction member II, and the ends of the air extraction member I and the air extraction member II are located inside the end block.

[0014] Preferably, a displacement groove is formed inside the end block. The movable air extraction member further includes a displacement block slidably installed inside the displacement groove. The ends of the air extraction member I and the air extraction member II are connected to the displacement block, and the air extraction member I and the air extraction member II are made of the same structure.

[0015] Preferably, the air extraction member I includes a metal hose installed on the side of the displacement block, and a plurality of air grooves are formed above and below the metal hose.

[0016] Preferably, a push column is fixedly installed on the side of the metal hose. A connecting column is fixedly installed on the side of the displacement block facing the metal hose. A round block is installed at the end of the push column extending through the connecting column. An annular spring is sleeved on the outer side of the push column. One end of the annular spring is connected to the side of the round block, and the other end of the annular spring is connected to the side of the connecting column.

[0017] Preferably, the horizontal height of the air extraction component one is higher than that of the air extraction component two. An air pipe and a plurality of electric telescopic rods are installed on the side of the displacement block away from the air extraction component one. The air pipe and the plurality of electric telescopic rods are located inside the displacement groove. The air pipe is located inside the telescopic column, and one end of the air pipe is connected to the air extraction pump.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. For a lithium battery production sealing device described in the present invention, by taking a lithium battery case and inserting it into this set of limiting rings, and inserting a battery upper cover into the lifting ring directly above the limiting ring. At this time, the battery upper cover is directly above the lithium battery case. The air extraction pump starts its suction function, allowing the mobile air extraction component to perform suction work to extract the air between the lithium battery case and the battery upper cover. After the air is extracted, the vacuum environment between the lithium battery case and the battery upper cover is maintained. The mobile air extraction component moves and is no longer in the vertical space between the battery upper cover and the lithium battery case. Under the action of the lifting component, the ultrasonic welding head presses the battery upper cover and descends. Under the action of the ultrasonic welding head, the battery upper cover and the lithium battery case are sealed.

[0020] 2. For a lithium battery production sealing device described in the present invention, multiple limiting rings and lifting rings are provided, and each pair of the multiple limiting rings and lifting rings matches each other. The inner diameters of each set of limiting rings and lifting rings are different, which is suitable for the sealing work of different groups of lithium batteries. The rotation of the clamping column can drive the rotation of the lifting column, the limiting ring and the lifting ring. Moreover, the telescopic settings of the telescopic component one and the telescopic component two will not cause the lifting ring and the limiting ring to touch the lifting component when the clamping column is selected. When the battery upper cover is inserted into the lifting ring, it will contact the annular airbag. Through the action of multiple micro air pumps, air is inflated into the annular airbag, causing the annular airbag to inflate and expand, making the outer side of the annular airbag closely contact the outer side of the battery upper cover, facilitating the subsequent vacuum pumping work. Description of the Drawings

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is the overall three-dimensional view of the present invention;

[0023] Figure 2 is the three-dimensional schematic diagram of the sealing component in the present invention;

[0024] Figure 3 It is a three-dimensional schematic diagram of the positioning component in the present invention;

[0025] Figure 4 It is a three-dimensional schematic diagram of the lithium battery housing in the present invention;

[0026] Figure 5 It is a three-dimensional schematic diagram of the battery upper cover in the present invention;

[0027] Figure 6 It is a three-dimensional schematic diagram of the lifting ring in the present invention;

[0028] Figure 7 It is a three-dimensional schematic diagram of the mobile air extraction component in the present invention;

[0029] Figure 8 It is a three-dimensional schematic diagram of the first air extraction component and the second air extraction component in the present invention;

[0030] Figure 9 It is a three-dimensional schematic diagram of the first air extraction component in the present invention;

[0031] Figure 10 It is a plan schematic diagram of the inflation ring and the pneumatic telescopic rod in the present invention.

[0032] In the figure: 1. Operation platform; 11. Sliding groove; 2. Sealing component; 21. Lifting component; 22. Ultrasonic welding head; 3. Positioning component; 31. Sliding bottom plate; 32. Clamping column; 321. Second telescopic member; 33. Lifting column; 331. First telescopic member; 3311. End block; 3312. Telescopic column; 3313. Telescopic spring; 3314. Displacement groove; 332. Lifting screw; 34. Air extraction pump; 35. Limiting ring; 36. Lifting ring; 361. Micro air pump; 362. Annular groove; 363. Annular airbag; 364. Inflation ring; 365. Pneumatic telescopic rod; 4. Lithium battery housing; 5. Battery upper cover; 6. Mobile air extraction component; 61. First air extraction component; 611. Metal hose; 6111. Air groove; 612. Pushing column; 613. Connecting column; 614. Round block; 615. Annular spring; 62. Second air extraction component; 63. Displacement block; 64. Air pipe; 65. Electric telescopic rod. Detailed implementation manners

[0033] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners. Embodiment

[0034] As Figures 1 - 6As shown in the figure, a sealing device for lithium battery production according to an embodiment of the present invention includes an operation platform 1 and a sealing assembly 2 installed above the operation platform 1. A lithium battery case 4 is placed above the operation platform 1, and a positioning assembly 3 is movably installed on the side of the operation platform 1;

[0035] The sealing assembly 2 includes a lifting assembly 21 movably installed above the operation platform 1. An ultrasonic welding head 22 is installed on the side of the lifting assembly 21. The positioning assembly 3 includes a clamping column 32 and a lifting column 33 movably installed directly above the clamping column 32. A plurality of limiting rings 35 are connected to the outside of the clamping column 32 by rods. An air extraction pump 34 is installed above the lifting column 33. A plurality of lifting rings 36 are connected to the outside of the lifting column 33 by rods. A battery upper cover 5 is placed inside the lifting ring 36. The battery upper cover 5 is directly above the corresponding lithium battery case 4. A movable air extraction member 6 is movably installed inside the lifting ring 36. An electric core component is arranged inside the lithium battery case 4.

[0036] Specifically, a set of limiting rings 35 is located directly above the operating platform 1. At this time, take the lithium battery case 4 and insert it into this set of limiting rings 35. Moreover, the bottom of the lithium battery case 4 is in contact with the upper part of the operating platform 1. Insert the battery upper cover 5 into the lifting ring 36 directly above the limiting rings 35. At this time, the battery upper cover 5 is directly above the lithium battery case 4. Through the lifting function of the lifting column 33, the lifting column 33 can be an electrically driven lead screw or an electric telescopic rod, so that the lifting ring 36 is sleeved above the lithium battery case 4. At this time, the battery upper cover 5 is not in contact with the lithium battery case 4. At this time, the mobile air extraction part 6 is inside the lifting ring 36 and is between the battery upper cover 5 and the lithium battery case 4. Drive the air extraction pump 34 to work. At this time, the air extraction pump 34 starts the suction function, so that the mobile air extraction part 6 performs the suction work to extract the air between the lithium battery case 4 and the battery upper cover 5. After the air is extracted, maintain the vacuum environment between the lithium battery case 4 and the battery upper cover 5. The mobile air extraction part 6 moves and is no longer in the vertical space between the battery upper cover 5 and the lithium battery case 4. Under the action of the lifting assembly 21, the ultrasonic welding head 22 presses the battery upper cover 5 and descends until the battery upper cover 5 presses down on the upper end of the lithium battery case 4, and the two are installed and connected. After the lithium battery case 4 and the battery upper cover 5 are initially installed, through the lifting function of the lifting column 33, the lifting ring 36 rises until the lifting ring 36 is no longer in contact with the lithium battery case 4. The inner diameter of the lifting ring 36 is larger than the diameter of the lower end of the ultrasonic welding head 22, that is, the lifting ring 36 is not in contact with the outer side of the ultrasonic welding head 22 either. Start the ultrasonic welding function of the ultrasonic welding head 22, so that the lithium battery case 4 and the battery upper cover 5 are ultrasonically welded, and the sealing work of the lithium battery case 4 is completed. The vacuum pumping work can prevent the problem of battery expansion caused by the increase in the internal pressure of the battery when the residual gas inside the battery is charged and discharged, improve the battery safety, and can also reduce the risk of thermal runaway of the battery during use.

[0037] As Figures 1 - 10 shown, a sliding groove 11 is opened at the bottom of the operating platform 1. The positioning assembly 3 further includes a sliding bottom plate 31. The sliding bottom plate 31 is slidably installed inside the sliding groove 11, and the clamping column 32 is inserted into the sliding bottom plate 31.

[0038] A plurality of telescopic members two 321 are fixedly installed on the outer side of the clamping column 32. The clamping column 32 is fixedly connected to the limiting ring 35 through the telescopic members two 321. A plurality of telescopic members one 331 are fixedly installed on the outer side of the lifting column 33. The lifting column 33 is fixedly connected to the outer side of the lifting ring 36 through the telescopic members one 331. A lifting screw rod 332 is installed below the lifting column 33, and the lower end of the lifting screw rod 332 is movably installed inside the clamping column 32.

[0039] The telescopic member 331 includes an end block 3311 fixedly installed outside the lifting ring 36 and a telescopic column 3312 installed on one side of the end block 3311. A telescopic spring 3313 is installed outside the telescopic column 3312, and the distance between the end block 3311 and the lifting column 33 is adjusted by the telescopic column 3312 and the telescopic spring 3313.

[0040] An annular groove 362 is provided inside the lifting ring 36, and an annular airbag 363 is installed inside the annular groove 362. Two micro air pumps 361 are arranged outside the mobile air extraction member 6. An inflation ring 364 is also installed inside the lifting ring 36. The inflation ring 364 is located below the annular airbag 363, and a plurality of pneumatic telescopic rods 365 are annularly arranged on the side of the inflation ring 364 facing the center of the lifting ring 36.

[0041] The mobile air extraction member 6 includes an air extraction member 61 and an air extraction member 62, and the ends of the air extraction member 61 and the air extraction member 62 are located inside the end block 3311.

[0042] A displacement groove 3314 is provided inside the end block 3311. The mobile air extraction member 6 further includes a displacement block 63 slidably installed inside the displacement groove 3314. The ends of the air extraction member 61 and the air extraction member 62 are connected to the displacement block 63, and the air extraction member 61 and the air extraction member 62 are made of the same structure.

[0043] The air extraction member 61 includes a metal hose 611 installed on the side of the displacement block 63, and a plurality of air grooves 6111 are provided above and below the metal hose 611.

[0044] A push column 612 is fixedly installed on the side of the metal hose 611. A connecting column 613 is fixedly installed on the side of the displacement block 63 facing the metal hose 611. A round block 614 is installed at the end of the push column 612 extending through the connecting column 613. An annular spring 615 is sleeved outside the push column 612. One end of the annular spring 615 is connected to the side of the round block 614, and the other end of the annular spring 615 is connected to the side of the connecting column 613.

[0045] The horizontal height of the air extraction member 61 is higher than that of the air extraction member 62. An air pipe 64 and a plurality of electric telescopic rods 65 are installed on the side of the displacement block 63 away from the air extraction member 61. The air pipe 64 and the plurality of electric telescopic rods 65 are located inside the displacement groove 3314. The air pipe 64 is located inside the telescopic column 3312, and one end of the air pipe 64 is connected to the air extraction pump 34.

[0046] Specifically, a plurality of limit rings 35 and lifting rings 36 are provided, and the plurality of limit rings 35 and lifting rings 36 are pairwise matched. The inner diameters of each group of limit rings 35 and lifting rings 36 are different and are suitable for the sealing work of different groups of lithium batteries. The rotation of the clamping column 32 can drive the rotation of the lifting column 33, the limit ring 35 and the lifting ring 36. Moreover, the telescopic settings of the first telescopic member 331 and the second telescopic member 321 will not cause the lifting ring 36 and the limit ring 35 to touch the lifting assembly 21 when the clamping column 32 is selected. When the battery upper cover 5 needs to be inserted into the lifting ring 36, a micro air pump 361 is activated, so that the inside of the inflatable ring 364 communicated with it is filled with gas, and then the gas enters the inside of the pneumatic telescopic rod 365. A plurality of pneumatic telescopic rods 365 extend, so that one end of them is no longer hidden inside the lifting ring 36 but is exposed above the mobile air extraction member 6. The plurality of annularly arranged pneumatic telescopic rods 365 have the same height and are all in the extended state. At this time, the battery upper cover 5 is inserted into the lifting ring 36 and the bottom of the battery upper cover 5 contacts the upper part of the plurality of pneumatic telescopic rods 365, that is, it is placed above the plurality of pneumatic telescopic rods 365. The shape of the pneumatic telescopic rod 365 can be cylindrical or flat. At this time, the outer side of the battery upper cover 5 will contact the annular airbag 363. Through the action of another micro air pump 361, air is inflated into the annular airbag 363, so that the annular airbag 363 is inflated and expanded, and the outer side of the annular airbag 363 is in close contact with the outer side of the battery upper cover 5, which is convenient for subsequent vacuum pumping work. When the mobile air extraction member 6 needs to perform air extraction work, the air extraction pump 34 works to extract the air between the lithium battery housing 4 and the battery upper cover 5 through the air pipe 64, the metal hose 611 and the air groove 6111. The air pipe 64 is connected to the metal hose 611 in the first air extraction member 61 and the second air extraction member 62. At this time, the positions of the first air extraction member 61 and the second air extraction member 62 are in the vertical space between the lithium battery housing 4 and the battery upper cover 5, and the first air extraction member 61 and the second air extraction member 62 are bent, which can effectively avoid the battery core structure at the center position inside the lithium battery housing 4 and quickly perform air extraction on the periphery of the battery core structure inside the lithium battery housing 4, that is, it speeds up the suction work and reduces the influence on the battery core structure at the center position inside the lithium battery housing 4 due to the suction effect. After the air extraction work is completed, the electric telescopic rod 65 contracts, so that the displacement block 63, the first air extraction member 61 and the second air extraction member 62 move into the displacement groove 3314. At this time, the air pipe 64 can be bent and coiled inside the displacement groove 3314. When the first air extraction member 61 and the second air extraction member 62 move into the displacement groove 3314, the inner wall of the displacement groove 3314 will contact the outer side of the metal hose 611, thereby playing a blocking role, that is, the metal hose 611 is changed from the original bent state to a nearly vertical state. At this time, the pushing column 612 slides towards the round block 614, stretching the annular spring 615 to deform it. Because the first air extraction member 61 and the second air extraction member 62 are not at the same horizontal height,Therefore, both the first air extraction member 61 and the second air extraction member 62 can be contracted into the displacement groove 3314. At this time, the mobile air extraction member 6 is not in the vertical space between the lithium battery housing 4 and the battery upper cover 5, and will not affect the sealing work between the lithium battery housing 4 and the battery upper cover 5. Moreover, when the lithium battery housing 4 and the battery upper cover 5 are sealed, the multiple air grooves 6111 provided in the first air extraction member 61 and the second air extraction member 62 will all perform the suction work, further increasing the vacuum effect during sealing. When the sealing work of the next group of lithium battery housings 4 and battery upper covers 5 is carried out, the displacement block 63 drives the first air extraction member 61 and the second air extraction member 62 to move into the lifting ring 36. Under the spring force of the deformation recovery of the annular spring 615, the push column 612 moves towards the side of the metal hose 611, and then presses against the middle position of the metal hose 611 to deform. That is, at this time, the first air extraction member 61 changes from a vertical state to a bent state, and can extract air from the inner wall positions around the lithium battery housing 4 to a greater extent. In this way, the air extraction efficiency is faster, and the greater air extraction force does not act on the battery core structure at the center inside the lithium battery housing 4. Moreover, in the moving mode of the mobile air extraction member 6, after completing the vacuum pumping work with higher efficiency, it can be hidden into the lifting ring 36 and the end block 3311, without affecting the immediate sealing work of the lithium battery housing 4 and the battery upper cover 5. And at this time, the hidden mobile air extraction member 6 can still perform the air extraction function slowly, avoiding the appearance of new air in the space between the lithium battery housing 4 and the battery upper cover 5 when they are sealed.

[0047] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A sealing device for lithium battery production, comprising an operation platform (1) and a sealing component (2) installed above the operation platform (1). A lithium battery case (4) is placed above the operation platform (1), and it is characterized in that: A positioning component (3) is movably installed on the side of the operation platform (1); The sealing component (2) includes a lifting component (21) movably installed above the operation platform (1). An ultrasonic welding head (22) is installed on the side of the lifting component (21). The positioning component (3) includes a clamping column (32) and a lifting column (33) movably installed directly above the clamping column (32). A plurality of limiting rings (35) are connected to the outside of the clamping column (32) through rods. An air extraction pump (34) is installed above the lifting column (33). A plurality of lifting rings (36) are connected to the outside of the lifting column (33) through rods. The battery upper cover (5) is placed inside the lifting ring (36). The battery upper cover (5) is directly above the corresponding lithium battery housing (4). A mobile air extraction part (6) is movably installed inside the lifting ring (36). A battery core component is arranged inside the lithium battery housing (4). The air extraction pump (34) is connected to the mobile air extraction part (6) through a pipeline; The mobile air extraction part (6) includes an air extraction component one (61) and a displacement block (63) for pushing the air extraction component one (61) to move into the lifting ring (36). The end of the air extraction component one (61) is connected to the displacement block (63). The air extraction component one (61) includes a metal hose (611) installed on the side of the displacement block (63) and bent. A plurality of air grooves (6111) are formed above and below the metal hose (611); A push column (612) is fixedly installed on the side of the metal hose (611). A connecting column (613) is fixedly installed on the side of the displacement block (63) facing the metal hose (611). A round block (614) is installed at the end of the push column (612) extending through the connecting column (613). An annular spring (615) is sleeved on the outside of the push column (612). One end of the annular spring (615) is connected to the side of the round block (614), and the other end of the annular spring (615) is connected to the side of the connecting column (613). During the process of driving the air extraction component one (61) to move into the lifting ring (36) by the displacement block (63), the push column (612) pushes the metal hose (611) to bend outward, avoiding the central position inside the lithium battery housing (4); An air pipe (64) and a plurality of electric telescopic rods (65) are installed on the side of the displacement block (63) away from the air extraction component one (61). The air pipe (64) and the plurality of electric telescopic rods (65) are located inside the displacement groove (3314), and one end of the air pipe (64) is connected to the air extraction pump (34).

2. The sealing device for lithium battery production according to claim 1, characterized in that: A sliding groove (11) is formed at the bottom of the operation platform (1). The positioning component (3) further includes a sliding bottom plate (31). The sliding bottom plate (31) is slidably installed inside the sliding groove (11). The clamping column (32) is inserted into the sliding bottom plate (31).

3. A sealing device for lithium battery production according to claim 1, characterized in that: A plurality of second telescopic members (321) are fixedly installed on the outer side of the clamping post (32). The clamping post (32) is fixedly connected to the limiting ring (35) through the second telescopic members (321). A plurality of first telescopic members (331) are fixedly installed on the outer side of the lifting post (33). The lifting post (33) is fixedly connected to the outer side of the lifting ring (36) through the first telescopic members (331). A lifting screw rod (332) is installed below the lifting post (33). The lower end of the lifting screw rod (332) is movably installed inside the clamping post (32).

4. A sealing device for lithium battery production according to claim 3, characterized in that: The first telescopic member (331) includes an end block (3311) fixedly installed on the outer side of the lifting ring (36) and a telescopic column (3312) installed on one side of the end block (3311). A telescopic spring (3313) is installed on the outer side of the telescopic column (3312). The distance between the end block (3311) and the lifting post (33) is adjusted by the telescopic column (3312) and the telescopic spring (3313).

5. A sealing device for lithium battery production according to claim 1, characterized in that: An annular groove (362) is formed inside the lifting ring (36). An annular airbag (363) is installed inside the annular groove (362). Two micro air pumps (361) are arranged on the outer side of the mobile air extraction member (6). An inflation ring (364) is further installed inside the lifting ring (36). The inflation ring (364) is located below the annular airbag (363). A plurality of pneumatic telescopic rods (365) are annularly arranged on the side of the inflation ring (364) facing the center of the lifting ring (36).

6. A sealing device for lithium battery production according to claim 4, characterized in that: The mobile air extraction member (6) further includes a second air extraction member (62). The ends of the first air extraction member (61) and the second air extraction member (62) are located inside the end block (3311).

7. A sealing device for lithium battery production according to claim 6, characterized in that: A displacement groove (3314) is formed inside the end block (3311). A displacement block (63) is slidably installed inside the displacement groove (3314). The end of the second air extraction member (62) is connected to the displacement block (63). The first air extraction member (61) and the second air extraction member (62) are made of the same structure.

8. A sealing device for lithium battery production according to claim 7, characterized in that: The horizontal height of the first air extraction member (61) is higher than that of the second air extraction member (62). The air pipe (64) is located inside the telescopic column (3312).

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