Lithium battery vacuum packaging device and centrifugal secondary sealing machine

Abstract

The present invention discloses a lithium battery vacuum packaging device, comprising an upper packaging mechanism, a lower packaging mechanism and a middle frame. The middle frame is sealed at its periphery but has upper and lower openings. The middle frame is detachably arranged between the upper packaging mechanism and the lower packaging mechanism. The upper packaging mechanism comprises an upper cover plate for sealing the upper opening of the middle frame, and the lower packaging mechanism comprises a base for sealing the lower opening of the middle frame. When in operation, the upper cover plate, the middle frame and the base form a closed cavity. The present invention also discloses a lithium battery centrifugal double sealing machine. The present invention arranges a detachable middle frame between the upper packaging mechanism and the lower packaging mechanism, so that when the head and bayonet need to be maintained, the middle frame can be removed to expose the upper and lower heads, making it convenient for staff to adjust the parallelism of the upper and lower heads, as well as to clean or replace and maintain the upper and lower heads, thereby improving the service life of the equipment and the packaging quality of the products, and reducing the production costs of the enterprise.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing equipment, and in particular to a lithium battery vacuum packaging device and a centrifugal secondary sealing machine thereof. Background Art

[0002] Vacuum packaging is one of the main processes in the production and manufacturing of lithium-ion battery cells. This process requires the following steps: puncturing the air bag, vacuuming, shaping the battery cell, packaging, and collecting residual liquid. All of these steps need to be completed in a sealed vacuum chamber. Currently, vacuum chambers in the industry all use a combination of an upper cavity and a lower cavity. The upper head and bayonet assembly are integrated into the upper cavity, while the lower head is placed in the lower cavity. This structure hides the head and bayonet deep inside the cavity, which is not conducive to their maintenance, affects the packaging accuracy of the battery cell and the service life of the equipment, and increases the company's production costs. In addition, existing liquid extraction molding machines make it difficult to completely separate air and electrolyte during the packaging process, resulting in more electrolyte leakage during the puncture process. The resulting battery capacity is low, making it difficult to meet people's requirements for high capacity and high density batteries. Summary of the Invention

[0003] In response to the deficiencies in the prior art, the present invention provides a lithium battery vacuum packaging device and a centrifugal secondary sealing machine thereof, which can improve the convenience of head and bayonet maintenance, improve the packaging accuracy and packaging quality of the battery cell, extend the service life of the equipment, and reduce the production cost of the enterprise.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A lithium battery vacuum packaging device includes an upper packaging mechanism, a lower packaging mechanism, and a middle frame. The middle frame is sealed at its periphery but has upper and lower openings. The middle frame is detachably arranged between the upper and lower packaging mechanisms. The upper packaging mechanism includes an upper cover for sealing the upper opening of the middle frame, and the lower packaging mechanism includes a base for sealing the lower opening of the middle frame. When in operation, the upper cover, middle frame, and base form a closed cavity.

[0006] As a preferred solution, at least one group of lower packaging components is provided on the base, and the lower packaging component includes a lower head and a cell tray for placing the battery cells. The lower head is provided on one side of the cell tray, and a liquid collection box is provided on the side of the lower head away from the cell tray.

[0007] The base is provided with an air extraction hole and a liquid extraction hole which are respectively communicated with the closed cavity and the liquid collecting box.

[0008] As a preferred solution, a side positioning block for positioning the side of the battery cell is provided on the other side of the battery cell support plate, and a positioning drive member for controlling the movement of the side positioning block is provided on the base.

[0009] As a preferred solution, the base is provided with a movable plate and a support plate driving member for controlling the movement of the movable plate. The battery cell support plate is arranged on the movable plate and can be driven by the movable plate to move away from the lower head.

[0010] As a preferred solution, at least one group of upper packaging components is provided on the upper cover plate, and the upper packaging component includes an upper head corresponding to the lower head, and the upper head is provided below the upper cover plate. A packaging drive component for controlling the up and down movement of the upper head is provided above the upper cover plate.

[0011] As a preferred solution, the middle frame is detachably connected to the upper cover via a quick clip.

[0012] As a preferred solution, a bayonet assembly for puncturing the battery cell is provided on the inner side of the middle frame, and a puncture drive member for controlling the up and down movement of the bayonet assembly is provided on the upper cover.

[0013] As a preferred solution, the bayonet assembly includes a bayonet and a knife holder, the bayonet is fixedly mounted on the knife holder, a knife holder mounting position is provided on the inner side of the middle frame, the knife holder is mounted on the knife holder mounting position so as to be movable up and down through a guide rod, and the knife holder mounting position is provided with a reset mechanism that enables the knife holder to always have a tendency to move upward.

[0014] The present invention also provides a lithium battery centrifugal secondary sealing machine, comprising a frame, on which a centrifugal turntable and a centrifugal drive mechanism for driving the centrifugal turntable to rotate are provided, and the edge of the centrifugal turntable is provided with at least one group of the above-mentioned lithium battery vacuum packaging devices.

[0015] The present invention works as follows:

[0016] First, place the battery cell to be packaged on the battery cell tray, and use the positioning drive to control the side positioning block to position one side of the battery cell, so that the other side of the battery cell moves toward the liquid collection box, and then make the upper cover plate move toward the base, so that the upper cover plate, the middle frame and the base form a closed cavity, and then the pressure plate is pressed down a certain distance under the control of the pressing drive, so as to avoid the battery cell from shifting during the rotation of the centrifugal turntable, and then the air is pumped into the closed cavity through the exhaust hole to form a negative pressure in the closed cavity. When the air pressure in the closed cavity reaches a certain value, the centrifugal drive mechanism drives the centrifugal turntable to rotate, so that the electrolyte is concentrated in the battery cell body area and the gas is concentrated in the battery cell air bag. area, and then the puncture drive component controls the bayonet assembly to move downward to puncture the battery cell air bag, so that the gas is squeezed out of the battery cell body under the action of negative pressure, and the outflowing electrolyte enters the liquid collection box; then the pressure plate is pressed to the surface of the battery cell body under the control of the pressing drive component, further expelling the gas inside the battery cell while ensuring the thickness of the battery cell; finally, the packaging drive component controls the upper head and the lower head to cooperate to complete the packaging of the battery cell; when the head and bayonet need to be maintained, it is only necessary to open the quick clamp to separate the middle frame from the upper cover, so that the head and bayonet are completely exposed, which is convenient for cleaning the head and bayonet, adjusting the parallelism of the upper and lower heads, and replacing Teflon.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, by arranging a detachable middle frame between the upper packaging mechanism and the lower packaging mechanism, when the head and the bayonet need to be maintained, the middle frame can be removed to expose the upper head and the lower head, which is convenient for the staff to adjust the parallelism of the upper head and the lower head, and convenient for cleaning or replacing and maintaining the upper head and the lower head, which is beneficial to improving the service life of the equipment and the packaging quality of the product, and reducing the production cost of the enterprise; by adopting the centrifugal packaging method, the spillage of electrolyte during the packaging process can be reduced or eliminated, and the electrolyte retention of the battery can be improved.

[0018] In order to more clearly illustrate the structural features, technical means and specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1. It is a schematic diagram of the assembly structure of a lithium battery centrifugal double sealing machine according to an embodiment of the present invention;

[0020] Figure 2 1. It is a schematic diagram of the exploded structure of a lithium battery vacuum packaging device according to an embodiment of the present invention;

[0021] Figure 3 1 is a schematic structural diagram of an upper packaging mechanism according to an embodiment of the present invention;

[0022] Figure 41 is a schematic structural diagram of a lower packaging mechanism according to an embodiment of the present invention;

[0023] Figure 5 This is a structural diagram of the lower packaging mechanism from another angle according to an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the installation structure of the bayonet assembly of an embodiment of the present invention.

[0025] Description of the accompanying drawings:

[0026] 100. Centrifugal drive mechanism; 200. Centrifugal turntable; 300. Lithium battery vacuum packaging device;

[0027] 10. Upper sealing mechanism; 11. Upper cover plate; 12. Upper head;

[0028] 13. Encapsulating the driving member; 14. Pressing plate; 15. Pressing the driving member;

[0029] 16. Puncture the drive member; 17. Plug the plug; 18. Deflate the drive member;

[0030] 20. Middle frame; 21. Blade holder; 22. Bayonet;

[0031] 23. Tool holder mounting position; 24. Guide rod; 30. Lower packaging mechanism;

[0032] 31. Base; 311. Air extraction hole; 312. Liquid extraction hole;

[0033] 313. Guide rail; 314. Adjustment mechanism; 32. Cell support plate;

[0034] 33. Lower head; 34. Liquid collecting box; 35. Side positioning block;

[0035] 36. Positioning drive member; 37. Movable plate; 38. Support plate drive member;

[0036] 40. Quick clip; 41. Buckle; 42. Adjustment lever;

[0037] 43. Hanging ring; 44. Handle; 45. Mounting base;

[0038] 50. Battery cell. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] like Figure 1-6 As shown, a lithium battery centrifugal double sealing machine includes a frame (not shown), on which a centrifugal turntable 200 and a centrifugal drive mechanism 100 for driving the centrifugal turntable 200 to rotate are provided. Four groups of lithium battery vacuum packaging devices 300 are provided on the edge of the centrifugal turntable 200. The lithium battery vacuum packaging device 300 includes an upper packaging mechanism 10, a lower packaging mechanism 30 and a middle frame. The middle frame is sealed around the periphery but has upper and lower openings. The middle frame 20 is detachably arranged between the upper packaging mechanism 10 and the lower packaging mechanism 30. The upper packaging mechanism 10 includes an upper cover plate 11 for sealing the upper opening of the middle frame 20, and the lower packaging mechanism 30 includes a base 31 for sealing the lower opening of the middle frame 20. When working, the upper cover plate 11, the middle frame 20 and the base 31 form a closed cavity. The middle frame 20 is detachably connected to the upper cover 11 via a quick clip 40. The quick clip 40 includes a buckle 41, an adjustment rod 42, and a handle 44. The buckle 41 includes an integrally formed mounting plate and a hook. The buckle 41 is mounted on one side of the main cover via a first mounting plate. One end of the adjustment rod 42 is provided with a hanging ring 43, and the other end is movably connected to the handle 44. The hanging ring 43 is used to be hung on the hook. A mounting seat 45 is provided on the outer side of the middle frame 20, and the handle 44 is hingedly connected to the mounting seat 45.

[0042] Specifically, the base 31 is provided with two groups of lower packaging components, each of which includes a lower sealing head 33 and a cell support plate 32 for placing the battery cell 50. The lower sealing head 33 is provided on one side of the cell support plate 32. A liquid collecting box 34 is provided on the side of the lower sealing head 33 away from the cell support plate 32. The other side of the cell support plate 32 is provided with a side positioning block 35 for positioning the side of the battery cell 50. The base 31 is provided with a positioning drive 36 for controlling the movement of the side positioning block 35. The base 31 is provided with a movable plate 37 and a support plate drive 38 for controlling the movement of the movable plate 37. The cell support plates 32 of the two groups of the lower packaging components are respectively provided at both ends of the movable plate 37 and can be driven by the movable plate 37 to move away from the lower sealing head 33. The base 31 is provided with a guide rail 313 extending toward the lower sealing head 33. The movable plate 37 is slidably connected to the guide rail 313. The base 31 is provided with an air extraction hole 311 and a liquid extraction hole 312, which are connected to the sealed cavity and the liquid collection box 34, respectively. The air extraction hole 311 and the liquid extraction hole 312 are located on the same side of the base 31, and the positioning drive member 36 and the support plate drive member 38 are located on the other side of the base 31. The lower surface of the base 31 is provided with an adjustment mechanism 314 for adjusting the height of the lower head 33.

[0043] The upper cover plate 11 is provided with two groups of upper packaging components, which correspond to the two groups of lower packaging components on the base 31 respectively. Both groups of upper packaging components include an upper head 12 corresponding to the lower head 33. The upper head 12 is provided below the upper cover plate 11. A packaging drive 13 for controlling the up and down movement of the upper head 12 is provided above the upper cover plate 11. A pressure plate 14 for pressing the battery cells 50 on the battery cell support plate 32 is provided on one side of the upper head 12. The upper cover plate 11 is provided with a pressure drive 15 for controlling the up and down movement of the pressure plate 14. The upper cover plate 11 is provided with an air vent connected to the sealed cavity. A air vent mechanism is provided above the air vent. The air vent mechanism includes a plug 17 and an air vent drive 18 for controlling the up and down movement of the plug 17. When evacuating air, the air vent drive 18 controls the plug 17 to block the air vent. When deflation occurs, the air vent drive 18 controls the plug 17 to move away from the air vent.

[0044] Two sets of bayonet assemblies for puncturing the battery cells are provided on the inner side of the middle frame 20, and a puncture drive 16 for controlling the up and down movement of the bayonet assemblies is provided on the upper cover 11. Both sets of the bayonet assemblies include a bayonet 22 and a knife holder 21. The bayonet 22 is fixedly mounted on the knife holder 21. A knife holder mounting position 23 is provided on the inner side of the middle frame 20. The knife holder 21 is mounted on the knife holder mounting position 23 so that it can move up and down via a guide rod 24. The knife holder mounting position 23 is provided with a reset mechanism that always keeps the knife holder 21 in an upward movement trend. During operation, the puncture drive 16 controls the knife holder 21 to overcome the elastic force of the reset mechanism and move downward, causing the bayonet 22 to puncture the air bag of the battery cell 50. After the puncture is completed, the puncture drive 16 returns to its original position, and the knife holder 21 is reset under the action of the reset mechanism.

[0045] It should be noted that, although in this embodiment, in order to improve production efficiency, a structure of four groups of lithium battery vacuum packaging devices 300 are set on the centrifugal turntable 200, in the actual production process, only one group of lithium battery vacuum packaging devices 300 is set on the centrifugal turntable 200, which can also achieve a normal centrifugal packaging process; and although the upper packaging mechanism 10 and the lower packaging mechanism 30 of the present invention both adopt a double-station structure, in actual production, a single-station structure can also be adopted, that is, the upper packaging mechanism 10 and the lower packaging mechanism 30 are respectively provided with only one group of upper packaging components and one group of single packaging components.

[0046] The present invention works as follows:

[0047] First, place the battery cell to be packaged on the battery cell support plate 32, and control the side positioning block 35 to position one side of the battery cell 50 through the positioning drive 36, so that the other side of the battery cell 50 moves toward the liquid receiving box 34, and then make the upper cover 11 move toward the base 31, so that the upper cover 11, the middle frame 20 and the base 31 form a closed cavity, and then the pressing plate 14 is pressed down a certain distance under the control of the pressing drive 15, so as to avoid the battery cell from shifting during the rotation of the centrifugal turntable 200, and then the air is evacuated through the exhaust hole 311 to form a negative pressure in the closed cavity. When the air pressure value in the closed cavity reaches a certain value, the centrifugal drive mechanism 100 drives the centrifugal turntable 200 to rotate, so that the electrolyte is concentrated in the battery cell body area and the gas is concentrated in the battery cell. The air bag area, and then the puncture drive 16 controls the bayonet 22 assembly to move downward to puncture the battery cell air bag, so that the gas is squeezed out of the battery cell body under the action of negative pressure, and the electrolyte flowing out enters the liquid collecting box 34, and then the pressure plate 14 is pressed to the surface of the battery cell 50 body under the control of the pressing drive 15, further expelling the gas inside the battery cell while ensuring the thickness of the battery cell, and finally the packaging drive 13 controls the upper head 12 and the lower head 33 to cooperate to complete the packaging of the battery cell 50; when the head and bayonet 22 need to be maintained, it is only necessary to open the quick clamp 40 to separate the middle frame 20 from the upper cover 11, so that the head and bayonet 22 are completely exposed, which is convenient for cleaning the head and bayonet 22, adjusting the parallelism of the upper and lower heads 33, and replacing Teflon.

[0048] The positioning drive member 36 , the support plate drive member 38 , the packaging drive member 13 , the pressing drive member 15 , the puncturing drive member 16 and the deflation drive member 18 in the present invention are all cylinders.

[0049] To sum up, the present invention provides a detachable middle frame 20 between the upper packaging mechanism 10 and the lower packaging mechanism 30, so that when the head and the bayonet 22 need to be maintained, the middle frame 20 can be removed to expose the upper head 12 and the lower head 33, which is convenient for the staff to adjust the parallelism of the upper head 12 and the lower head 33, and convenient for cleaning or replacement and maintenance of the upper head 12 and the lower head 33, which is beneficial to improving the service life of the equipment and the packaging quality of the product, and reducing the production cost of the enterprise; by adopting the centrifugal packaging method, the spillage of electrolyte during the packaging process can be reduced or eliminated, and the electrolyte retention of the battery can be improved.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical practice of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A lithium battery vacuum packaging device, characterized in that: The device comprises an upper packaging mechanism, a lower packaging mechanism, and a middle frame. The middle frame is sealed at its periphery but has upper and lower openings. The middle frame is detachably disposed between the upper and lower packaging mechanisms. The upper packaging mechanism comprises an upper cover for sealing the upper opening of the middle frame. The lower packaging mechanism comprises a base for sealing the lower opening of the middle frame. When in operation, the upper cover, the middle frame, and the base form a sealed cavity. At least one group of lower packaging components is provided on the base, and the lower packaging components include a lower head and a cell support plate for placing the battery cell. At least one group of upper packaging components is provided on the upper cover, and the upper packaging components include an upper head corresponding to the lower head. The upper head is provided below the upper cover, and a packaging driving component for controlling the up and down movement of the upper head is provided above the upper cover. The middle frame is detachably connected to the upper cover by a quick clamp.

2. The lithium battery vacuum packaging device according to claim 1, characterized in that: The lower sealing head is arranged on one side of the battery core support plate, and a liquid collecting box is arranged on the side of the lower sealing head away from the battery core support plate.

3. The lithium battery vacuum packaging device according to claim 2, characterized in that: The base is provided with an air extraction hole and a liquid extraction hole which are respectively communicated with the closed cavity and the liquid collecting box.

4. The lithium battery vacuum packaging device according to claim 2, characterized in that: A side positioning block for positioning the side of the battery cell is provided on the other side of the battery cell support plate, and a positioning driving member for controlling the movement of the side positioning block is provided on the base.

5. The lithium battery vacuum packaging device according to claim 4, characterized in that: The base is provided with a movable plate and a support plate driving member for controlling the movement of the movable plate. The battery core support plate is arranged on the movable plate and can be driven by the movable plate to move in a direction away from the lower head.

6. The lithium battery vacuum packaging device according to claim 1, characterized in that: The inner side of the middle frame is provided with a bayonet assembly for puncturing the battery core, and the upper cover is provided with a puncture driving member for controlling the up and down movement of the bayonet assembly.

7. The lithium battery vacuum packaging device according to claim 6, characterized in that: The bayonet assembly includes a bayonet and a knife holder. The bayonet is fixedly mounted on the knife holder. A knife holder mounting position is provided on the inner side of the middle frame. The knife holder is mounted on the knife holder mounting position so as to be movable up and down through a guide rod. The knife holder mounting position is provided with a reset mechanism that enables the knife holder to always have an upward movement tendency.

8. A centrifugal secondary sealing machine for lithium batteries, characterized by: The invention comprises a frame, wherein a centrifugal turntable and a centrifugal driving mechanism for driving the centrifugal turntable to rotate are provided on the frame, and at least one set of lithium battery vacuum packaging devices according to any one of claims 1 to 7 is provided on the edge of the centrifugal turntable.

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