Vacuum packaging device and secondary packaging machine

Abstract

The invention relates to a vacuum packaging device and a secondary sealing machine, and relates to the technical field of lithium battery production, the vacuum packaging device comprises a lower sealing seat, an upper sealing seat, a puncture structure, a plugging structure and a pair of cleaning structures, the upper sealing seat and the lower sealing seat are enclosed to form a closed working cavity, and the bottom side of the upper sealing seat is provided with a mounting groove and a through hole communicated to the working cavity; the puncturing structure comprises a bayonet which is twisted with the upper sealing seat; the plugging structure is connected to the upper side of the upper sealing base in a liftable mode and used for descending to plug the through hole and pushing the bayonet to stretch out of the mounting groove and ascending to be away from the through hole so that the bayonet can return and be stored in the mounting groove. The cleaning structures are oppositely arranged on the two sides of the bayonet return path, each cleaning structure comprises a sponge body, a humidity sensor and an extrusion part, and the humidity sensors are arranged in the sponge bodies; the humidity sensor is provided with a calibrated humidity range and connected with the extrusion part, and when the detected humidity value is larger than the calibrated humidity range value, the extrusion part extrudes the sponge body. According to the invention, corrosion of electrolyte to the scraper can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery production, and in particular to a vacuum packaging device and a secondary sealing machine. Background Art

[0002] Soft-packaged lithium batteries have the advantages of high voltage, high specific energy, many cycles and long storage time, so they are widely used in various fields such as electronic equipment. The production process of soft-packaged lithium batteries includes vacuum packaging, air bag pre-cutting, secondary fine sealing, fine edge cutting, folding, glue dispensing and hot edge, etc. This series of steps is completed by the secondary sealing machine.

[0003] The secondary sealing machine mainly includes a centrifugal turntable and multiple vacuum packaging devices arranged on the centrifugal turntable to provide multiple workstations for producing lithium batteries. Among them, the vacuum packaging device mainly includes an upper sealing seat, a lower sealing seat, a bayonet and a sealing head. In the process of producing lithium batteries, the upper sealing seat and the lower sealing seat are closed to form a closed working chamber, and the bayonet pierces the air bag on the lithium battery, and forms a negative pressure by sucking the air in the working chamber, so that the air and excess electrolyte in the lithium battery are discharged, and then the sealing head is sealed again and the air bag part is cut off, and the overall packaging work is completed.

[0004] However, when the bayonet punctures the air bag, part of the electrolyte will adhere to the bayonet, corroding the bayonet and causing great damage to the bayonet. As the service time of the bayonet increases, the sharpness of the bayonet gradually fails to meet the requirements of puncturing the air bag, and the bayonet needs to be replaced frequently. Summary of the invention

[0005] The purpose of the present application is to provide a vacuum packaging device and a secondary sealing machine, which can clean the electrolyte on the scraper and reduce the corrosion of the scraper.

[0006] In the first aspect, the present application provides a vacuum packaging device that adopts the following technical solution:

[0007] A vacuum packaging device, comprising:

[0008] seal the seat;

[0009] An upper sealing seat, enclosed with the lower sealing seat to form a closed working chamber, wherein a mounting groove and a through hole connected to the working chamber are provided on the bottom side of the upper sealing seat;

[0010] A piercing structure, arranged in the mounting groove, comprising a bayonet twistedly connected to the upper sealing seat;

[0011] A blocking structure is liftably connected to the upper side of the upper sealing seat, and is used to descend to block the through hole and push the bayonet out of the mounting slot, and to ascend away from the through hole so that the bayonet is returned to the mounting slot;

[0012] A pair of cleaning structures, the pair of cleaning structures are oppositely arranged on both sides of the bayonet return path, the cleaning structures include a sponge body, a humidity sensor and an extrusion piece, the humidity sensor is arranged in the sponge body, and is used to detect the humidity of the sponge body;

[0013] Wherein, the humidity sensor is provided with a calibrated humidity range and is connected to the extrusion member. When the detected humidity value is greater than the calibrated humidity range value, the extrusion member squeezes the sponge.

[0014] Furthermore, a fixing groove is provided on the inner wall of the through hole;

[0015] The vacuum packaging device further includes a transmission structure, which includes:

[0016] An elastic element is annular and has an inner diameter larger than the aperture of the through hole, and one end of the elastic element is connected to the groove wall of the fixing groove;

[0017] A push rod, which is located in the mounting groove and connected to the other end of the elastic element;

[0018] When the blocking structure descends to block the through hole, the elastic element is passed to drive the push rod to push the bayonet out of the mounting slot.

[0019] Furthermore, a portion of the through hole close to the push rod is radially expanded to form a fixing groove, and one end of the elastic element is connected to a groove wall of the fixing groove.

[0020] Furthermore, a limiting plate is arranged in the installation groove, and an insertion hole and a movable groove for the movement of the puncture structure are opened on the limiting plate. The insertion hole is connected with the movable groove and is used for the insertion of the push rod.

[0021] Furthermore, a movable plate is slidably connected in the movable groove, the movable plate is located above the bayonet, and one end of the movable plate can abut against the side wall of the push rod.

[0022] Furthermore, a cleaning groove is provided on the side wall of the movable groove, and the cleaning structure is installed in the cleaning groove.

[0023] Furthermore, a liquid collecting box is also provided in the cleaning tank. The liquid collecting box is located at the bottom side of the cleaning structure and is used to collect electrolyte.

[0024] Furthermore, the surface of the bayonet is coated with a liquid-repellent layer.

[0025] Furthermore, a fixing plate is provided on the lower sealing seat, and the fixing plate is spaced apart from the lower sealing seat in the vertical direction to form a fixing cavity for inserting the battery, and a limiting hole connected to the fixing cavity is opened on the fixing plate for inserting the bayonet.

[0026] In a second aspect, the present application provides a double sealing machine, comprising a centrifugal turntable, a temperature control system and the above-mentioned vacuum packaging device, wherein a plurality of the vacuum packaging devices are arranged around the centrifugal turntable, the vacuum packaging device comprises a sealing head, and the temperature control system is connected to the sealing head for monitoring and adjusting the temperature when packaging lithium batteries.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The present application is provided with a blocking structure and a cleaning structure. The blocking structure can drive the bayonet to rotate back and forth. When the bayonet is not performing puncture work, the bayonet can be stored in the mounting groove. With the help of the reciprocating rotation process of the bayonet, the sponge can scrape off the electrolyte attached to the bayonet, thereby reducing the corrosion of the electrolyte to the bayonet.

[0029] 2. A humidity sensor is provided in the sponge body in the present application, which can detect the humidity of the sponge body. When the humidity value of the sponge body exceeds the calibrated humidity range, the extrusion piece can squeeze out the electrolyte adsorbed in the sponge body, and collect it through the liquid collecting device or liquid collecting box on the lower sealing seat, thereby further protecting the bayonet.

[0030] 3. A transmission structure is provided in the present application, and the transmission structure includes a push rod and an elastic element. The blocking structure can synchronously push multiple bayonets through the push rod. When the push rod pushes the bayonet, it is inserted into the insertion hole, and the bayonet can be better limited when the bayonet moves down to pierce the air bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the three-dimensional structure of the vacuum packaging device in this application;

[0032] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A;

[0033] Figure 3 is a schematic cross-sectional structural diagram of the vacuum packaging device in the present application;

[0034] Figure 4 It is a partial structural schematic diagram of the vacuum packaging device in this application;

[0035] Figure 5 It is a three-dimensional structural schematic diagram of the limiting plate and the movable plate in this application;

[0036] Figure 6 It is a schematic cross-sectional view of the cleaning structure, transmission structure and puncture structure in the present application;

[0037] Figure 7 It is a three-dimensional structural schematic diagram of the cleaning structure in this application.

[0038] In the figure, 1, lower sealing seat; 11, fixed cavity; 12, exhaust hole; 13, liquid collecting hole; 2, upper sealing seat; 21, mounting groove; 22, through hole; 221, fixed groove; 3, puncture structure; 31, bayonet; 32, bayonet drive member; 4, blocking structure; 5, cleaning structure; 51, sponge; 52, humidity sensor; 53, extrusion member; 54, liquid collecting box; 6, transmission structure; 61, push rod; 611, connecting rod; 612, insertion rod; 62, elastic element; 7, limit plate; 71, insertion hole; 72, movable groove; 721, cleaning groove; 8, movable plate; 9, fixed plate; 91, limit hole; 10, head. DETAILED DESCRIPTION

[0039] The following will be combined with the attached Figure 1-7 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0043] A vacuum packaging device, referring to Figure 1 and Figure 2 , including a lower sealing seat 1, an upper sealing seat 2 and a puncture structure 3. When the lithium battery is packaged, the upper sealing seat 2 and the lower sealing seat 1 are enclosed to form a closed working chamber to provide a vacuum environment for the packaging work; further, combined with Figure 3 and Figure 4 A mounting groove 21 is provided on the bottom side of the upper sealing seat 2, and the puncture structure 3 is arranged in the mounting groove 21. After the upper sealing seat 2 and the lower sealing seat 1 are closed, the puncture structure 3 moves toward the lower sealing seat 1 to puncture the air bag on the lithium battery.

[0044] At the same time, the air in the working chamber is sucked out by the vacuum equipment, so that the working chamber is in a negative pressure state, so that after the air bag is punctured, the gas and free electrolyte in the lithium battery can overflow from the air bag.

[0045] In a specific embodiment, a plurality of puncture structures 3 are provided, and the air bag is punctured simultaneously by the plurality of puncture structures 3, so as to achieve the purpose of rapidly discharging gas and electrolyte.

[0046] It should be noted that an air suction hole 12 and a liquid collecting hole 13 are provided on the lower sealing seat 1. The air suction device can be connected to the lower sealing seat 1 through the air suction hole 12 to perform suction work; the liquid collecting hole 13 is connected to the liquid collecting device. During the suction process, the electrolyte enters the liquid collecting device through the liquid collecting hole 13 and is then collected centrally.

[0047] Furthermore, a fixing plate 9 is provided on the lower sealing seat 1, and the fixing plate 9 is spaced apart from the lower sealing seat 1 in the vertical direction to form a fixing cavity 11 for inserting the battery. A limiting hole 91 connected to the fixing cavity 11 is opened on the fixing plate 9 for inserting the bayonet 31.

[0048] Furthermore, a sealing head 10 is provided on both the lower sealing seat 1 and the upper sealing seat 2. After the gas and electrolyte in the lithium battery are discharged, the lithium battery is heat-sealed through the sealing head 10. After the packaging is completed, the air bag can be cut off from the lithium battery through a cutting mechanism.

[0049] Furthermore, a through hole 22 connected to the working chamber is formed on the bottom side of the upper sealing seat 2 , and the vacuum packaging device further comprises a blocking structure 4 which is liftably connected to the upper side of the upper sealing seat 2 .

[0050] The blocking structure 4 is rod-shaped. In a specific embodiment, a frame can be installed on the upper sealing seat 2, and a blocking driving member is installed on the frame. The blocking driving member can be set as a linear cylinder or an electric push rod 61. The frame is provided to provide installation conditions for the blocking structure 4, and the blocking driving member is provided to provide power for the movement of the blocking structure 4.

[0051] When the upper seat and the lower sealing seat 1 are closed, the sealing structure 4 is extended into the through hole 22 to seal the through hole 22, and then the vacuum device is started; after the lithium battery is packaged, the vacuum device is turned off and the sealing structure 4 is pulled out from the through hole 22, so as to achieve the purpose of rapid pressure relief.

[0052] This can reduce the difficulty in disengaging the upper sealing seat 2 and the lower sealing seat 1 due to the negative pressure after the lithium battery is packaged.

[0053] Further, refer to Figure 5 and Figure 6 The blocking structure 4 is used to descend to block the through hole 22 and push the bayonet 31 out of the mounting slot 21 and rise away from the through hole so that the bayonet 31 returns to be accommodated in the mounting slot 21; correspondingly, the piercing structure 3 includes a bayonet 31 and a torsion spring (not shown), and the bayonet 31 is twisted with the upper sealing seat 2 through the torsion spring.

[0054] When the bayonet 31 does not puncture the air bag, the bayonet 31 is horizontally arranged in the installation slot 21. Such an arrangement can reduce the situation where the bayonet 31 is excessively exposed to the air and thus accelerates corrosion; when the blocking structure 4 blocks the through hole 22, the blocking structure 4 can extend into the working cavity and push the bayonet 31 to rotate. At this time, the torsion spring is squeezed and the bayonet 31 is arranged vertically to facilitate puncturing the air bag. When the lithium battery is packaged and the blocking structure 4 is pulled out of the through hole 22, the torsion spring is reset, and the bayonet 31 is reset and returns to the installation slot 21.

[0055] By means of the vertical movement of the blocking structure 4, the bayonet 31 can be well protected in the installation groove 21 when not performing the puncturing action.

[0056] Furthermore, a fixing groove 221 is opened on the inner wall of the through hole 22, and a transmission structure 6 is arranged at the through hole 22, the transmission structure 6 includes a push rod 61 and an elastic element 62, one end of the elastic element 62 is connected to the groove wall of the fixing groove 221, and the other end of the elastic element 62 is connected to the push rod 61.

[0057] When the blocking structure 4 descends to block the through hole 22 , the elastic element is passed to drive the push rod 61 to push the bayonet 31 out of the mounting slot 21 .

[0058] Specifically, when the blocking structure 4 extends from the through hole 22 into the working chamber, the end of the blocking structure 4 pushes the push rod 61, causing the push rod 61 to move vertically downward, thereby pressing down the bayonet 31, causing the bayonet 31 to rotate. With the help of the transmission structure 6, the bayonet 31 can be pushed better. When the blocking structure 4 is withdrawn from the through hole 22, the elastic element 62 can also rebound, thereby driving the push rod 61 to reset.

[0059] Further, the push rod 61 includes a connecting rod 611 and an insertion rod 612 connected to the lower side of the connecting rod 611, and a plurality of insertion rods 612 are provided, which are arranged one by one corresponding to the plurality of puncture structures 3. That is, the push rod 61 can synchronously drive the plurality of bayonets 31 to rotate.

[0060] Combination Figure 4 In a specific embodiment, the elastic element 62 is annular (preferably a spring) and has an inner diameter greater than the aperture of the through hole 22. By limiting the size of the elastic element 62, the annular elastic element 62 will not interfere with the movement of the blocking structure 4 when the blocking structure 4 pushes the connecting rod 611.

[0061] Further, refer to Figure 5 and Figure 6 A limiting plate 7 is arranged in the mounting groove 21 , and an insertion hole 71 and a movable groove 72 for the puncture structure 3 to move are opened on the limiting plate 7 , and the insertion hole 71 is communicated with the movable groove 72 and is used for the push rod 61 to be inserted.

[0062] When the push rod 61 pushes the bayonet 31 to move, the push rod 61 will first extend from the insertion hole 71 into the movable groove 72, and the push rod 61 will be limited by the insertion hole 71, thereby ensuring that the push rod 61 and the bayonet 31 can move stably.

[0063] In a specific embodiment, a movable plate 8 is slidably connected in the movable groove 72 , the movable plate 8 is located above the bayonet 31 , and one end of the movable plate 8 can abut against the side wall of the push rod 61 , and the movable plate 8 and the groove wall of the movable groove 72 are enclosed to form the above-mentioned insertion hole 71 .

[0064] When the bayonet 31 is rotated from a horizontal setting to a vertical setting, the aperture of the insertion hole 71 needs to be larger than the width of the bayonet 31. When facing bayonets 31 of different sizes, the aperture of the insertion hole 71 can be adjusted by sliding the movable plate 8 to better match the size of the bayonet 31.

[0065] In a specific embodiment, the aperture of the insertion hole 71 can be made equal to the aperture of the insertion hole 71 and the outer diameter of the insertion rod 612. When the insertion rod 612 is inserted into the insertion hole 71, one side of the insertion rod 612 abuts against the end of the movable plate 8, and the other side of the insertion rod 612 abuts against the side of the bayonet 31, thereby limiting the movement of the push rod 61 and the bayonet 31.

[0066] It should be noted that, in the present embodiment, a bayonet 31 driving member (preferably a linear cylinder) is also provided. When the bayonet 31 is vertically arranged, the bayonet 31 driving member can push the bayonet 31 to move vertically downward to puncture the air bag.

[0067] Furthermore, considering that during the process of puncturing the air bag, electrolyte will adhere to the bayonet 31, combined with Figure 7 The vacuum packaging device further includes a cleaning structure 5, and a plurality of pairs of cleaning structures 5 are provided, and the plurality of pairs of cleaning structures 5 are arranged one-to-one corresponding to the plurality of bayonets 31. In this embodiment, two cleaning structures 5 form a pair, and the pair of cleaning structures 5 are arranged oppositely on both sides of the return path of the bayonet 31 to clean the electrolyte attached to the bayonet 31.

[0068] Furthermore, a cleaning groove 721 is opened on the side wall of the movable groove 72 , and the cleaning structure 5 is installed in the cleaning groove 721 . The cleaning structure 5 can be better supported by the bottom wall of the cleaning groove 721 .

[0069] The cleaning structure 5 includes a sponge 51. When the blocking structure 4 is extended into or withdrawn from the mounting groove 21 from the through hole 22, the bayonet 31 will rotate back and forth. During the rotation, the electrolyte attached to the bayonet 31 will be absorbed by the sponge 51, thereby protecting the bayonet 31.

[0070] In a specific embodiment, a liquid-repellent layer may be coated on the surface of the bayonet 31. The provision of the liquid-repellent layer can further reduce the amount of electrolyte attached to the bayonet 31 after the bayonet 31 punctures the air bag, and the electrolyte on the bayonet 31 can be scraped off more smoothly by the sponge 51.

[0071] It should be noted that after the bayonet 31 is reset, it is located above the sponge 51 and no longer contacts the sponge 51 .

[0072] Furthermore, the cleaning structure 5 also includes a humidity sensor 52 and an extrusion piece 53 . The humidity sensor 52 is disposed in the sponge body 51 and connected to the extrusion piece 53 .

[0073] The humidity sensor 52 is provided with a calibrated humidity range. With the accumulation of electrolyte in the sponge 51 , the humidity detected by the humidity sensor 52 gradually increases. When the humidity value detected by the humidity sensor 52 exceeds the calibrated humidity range, the humidity sensor 52 transmits a control signal to the extrusion member 53 to squeeze the sponge 51 .

[0074] Specifically, the extrusion member 53 includes an extrusion rod and an extrusion driving member, which is connected to the extrusion rod. When the output end of the extrusion driving member retracts, it drives the extrusion plate to move in a direction away from the bayonet 31, thereby squeezing out the electrolyte in the sponge 51.

[0075] Correspondingly, in a specific embodiment, a liquid collecting box 54 is provided in the cleaning tank 721, and the liquid collecting box 54 is located at the bottom side of the cleaning structure 5, and is used to collect the electrolyte squeezed out from the sponge 51. It should be noted that, in another specific embodiment, the liquid collecting box 54 may not be provided, and the squeezed electrolyte directly falls onto the lower sealing seat 1 and is collected into the liquid collecting device through the liquid collecting hole 13.

[0076] In addition, this embodiment also discloses a double sealing machine, including a centrifugal turntable, a temperature control system and the above-mentioned vacuum packaging device, multiple vacuum packaging devices are arranged around the centrifugal turntable, the vacuum packaging device includes a head 10, and the temperature control system is connected to the head 10 for monitoring and adjusting the temperature when packaging lithium batteries.

[0077] The implementation principle of the embodiment of the present application is as follows: a blocking structure 4 is provided in the present application, which can block the through hole 22 and provide a sealed environment. When the blocking structure 4 extends from the through hole 22 into the working chamber, the blocking structure 4 can press down the transmission structure 6, and the transmission structure 6 further promotes the bayonet 31 to rotate and limits the downward movement of the bayonet 31. When the packaging work is completed, the blocking structure 4 can be pulled out of the working chamber from the through hole 22. At this time, the bayonet 31 is reset and protected in the movable groove 72.

[0078] With the help of the reciprocating rotation of the bayonet 31, the sponge 51 can scrape off the electrolyte attached to the bayonet 31, thereby reducing the corrosion of the electrolyte to the bayonet 31, and a humidity sensor 52 is also provided in the sponge 51, and the humidity sensor 52 can detect the humidity of the sponge 51. When the humidity value of the sponge 51 exceeds the calibrated humidity range, the extrusion piece 53 can squeeze out the electrolyte adsorbed in the sponge 51, and the electrolyte is collected through the liquid collecting device or the liquid collecting box 54 on the lower sealing seat 1, thereby better protecting the bayonet 31.

[0079] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vacuum packaging device, characterized in that: include: Lower seal(1); An upper sealing seat (2) is enclosed with the lower sealing seat (1) to form a closed working chamber, and a mounting groove (21) and a through hole (22) connected to the working chamber are provided on the bottom side of the upper sealing seat (2); A piercing structure (3) is arranged in the mounting groove (21), and comprises a bayonet (31) twistedly connected to the upper sealing seat (2); A blocking structure (4) is liftably connected to the upper side of the upper sealing seat (2), and is used to descend to block the through hole (22) and push the bayonet (31) out of the mounting groove (21), and to ascend away from the through hole so that the bayonet (31) is returned to be accommodated in the mounting groove (21); A pair of cleaning structures (5), the pair of cleaning structures (5) are arranged oppositely on both sides of the return path of the bayonet (31), the cleaning structures (5) comprising a sponge (51), a humidity sensor (52) and an extrusion member (53), the humidity sensor (52) being arranged in the sponge (51) for detecting the humidity of the sponge (51); The humidity sensor (52) is provided with a calibrated humidity range and is connected to the extrusion member (53); when the detected humidity value is greater than the calibrated humidity range value, the extrusion member (53) squeezes the sponge (51).

2. A vacuum packaging device according to claim 1, characterized in that: A fixing groove (221) is provided on the inner wall of the through hole (22); The vacuum packaging device further comprises a transmission structure (6), wherein the transmission structure (6) comprises: An elastic element (62) is annular and has an inner diameter greater than the diameter of the through hole (22), and one end of the elastic element (62) is connected to the groove wall of the fixing groove (221); A push rod (61), which is located in the mounting groove (21) and connected to the other end of the elastic element (62); When the blocking structure (4) descends to block the through hole (22), the elastic element is passed to drive the push rod (61) to push the bayonet (31) out of the installation slot (21).

3. A vacuum packaging device according to claim 2, characterized in that: The portion of the through hole (22) close to the push rod (61) is radially expanded to form a fixing groove (221), and one end of the elastic element (62) is connected to the groove wall of the fixing groove (221).

4. A vacuum packaging device according to claim 2, characterized in that: A limit plate (7) is arranged in the installation groove (21), and an insertion hole (71) and a movable groove (72) for the puncture structure (3) to move are provided on the limit plate (7), and the insertion hole (71) is communicated with the movable groove (72) and is used for the push rod (61) to be inserted.

5. A vacuum packaging device according to claim 4, characterized in that: A movable plate (8) is slidably connected in the movable groove (72). The movable plate (8) is located above the bayonet (31), and one end of the movable plate (8) can abut against the side wall of the push rod (61). The movable plate (8) and the groove wall of the movable groove (72) are enclosed to form the insertion hole (71).

6. A vacuum packaging device according to claim 4, characterized in that: A cleaning groove (721) is provided on the side wall of the movable groove (72), and the cleaning structure (5) is installed in the cleaning groove (721).

7. A vacuum packaging device according to claim 6, characterized in that: A liquid collecting box (54) is also provided in the cleaning tank (721); the liquid collecting box (54) is located at the bottom side of the cleaning structure (5) and is used to collect electrolyte.

8. The vacuum packaging device according to any one of claim 1, characterized in that: The surface of the bayonet (31) is coated with a liquid-repellent layer.

9. The vacuum packaging device according to claim 1, characterized in that: A fixing plate (9) is arranged on the lower sealing seat (1), and the fixing plate (9) is spaced apart from the lower sealing seat (1) in the vertical direction to form a fixing cavity (11) for inserting a battery, and a limiting hole (91) connected to the fixing cavity (11) is opened on the fixing plate (9) for inserting the bayonet (31).

10. A double sealing machine, characterized in that: It comprises a centrifugal turntable, a temperature control system and a plurality of vacuum packaging devices as described in any one of claims 1 to 9, wherein the plurality of vacuum packaging devices are arranged around the centrifugal turntable, the vacuum packaging device comprises a sealing head (10), and the temperature control system is connected to the sealing head (10) and is used to monitor and adjust the temperature when packaging lithium batteries.

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