A lithium battery coating device and process

Abstract

This invention discloses a lithium battery coating device and process, belonging to the field of lithium battery coating processing. The device includes a protrusion and a clamping part disposed inside the frame of a coating machine. The protrusion adheres to a protective film, and a guide block, triangular in shape, is positioned above the protrusion to contact the protective film. This guide block guides the protective film to change position, allowing the protective film in contact with the protrusion to protrude beyond the vertical protective film. When the clamping part pushes the lithium battery towards one side of the protective film, the lithium battery first contacts the protruding area of ​​the protective film, gradually completing the initial compression from point to surface. Air trapped between the protective film and the side of the lithium battery can gradually escape along the unbonded area, preventing the formation of air bubbles due to large-area instantaneous compression. Furthermore, the clamping part can push the protective film to cover the lithium battery and displace the air between the protective film and the lithium battery, ensuring that no air bubbles remain between them.

Description

Technical Field

[0001] This invention relates to the field of lithium battery pack processing, and particularly to a lithium battery packing apparatus and process. Background Technology

[0002] The lithium battery pack is a key component of lithium battery packaging. It is designed to completely isolate the battery cell from the external environment using high-barrier materials, ensuring a vacuum, oxygen-free, and water-free environment inside the battery, thereby guaranteeing battery performance and safety.

[0003] The reference patent title is: A Lithium Battery Protective Film Coating Equipment (Patent Publication No.: CN121662847A), which includes a frame, and further includes: a film unfolding mechanism, a battery wrapping mechanism, and a bonding mechanism. A film unfolding mechanism for unwinding and flattening the protective film is installed on one side of the frame, a battery wrapping mechanism for coating the battery is installed on another side of the frame, and a bonding mechanism for side-bonding the coated battery is installed on the upper side of the frame. The film unfolding mechanism includes: an unwinding assembly and an alternating unfolding assembly. An unwinding assembly for assisting in unwinding the film is installed on the upper side of the frame, and an alternating unfolding assembly for alternately unfolding the film is installed on the upper side of the frame. This allows for rapid application of protective film to the top and bottom surfaces and front and back surfaces of the battery while simultaneously eliminating air bubbles, and enables rapid further bonding of the protective film to the battery sidewalls to complete the battery coating process.

[0004] However, the following problems exist when implementing the above technical solutions: During the coating process, the protective film and the rear side of the battery are the initial contact points. At this point, the film is directly pressed onto the side of the battery by the force of the grippers. Since the initial contact between the protective film and the side of the battery is a large-area instantaneous pressing, the air between the film and the battery casing cannot be expelled in time, and it is very easy to form closed air bubbles on the initial contact side. Moreover, since the air bubbles are formed at the beginning of the coating process, they cannot be eliminated by subsequent processes such as pressing with the upper and lower surface guide rollers and pushing with the side L-shaped plate. They will still remain on the side of the battery, resulting in poor flatness of the coating and poor adhesion of the insulation layer, which affects the appearance and protective reliability of the battery.

[0005] Therefore, this invention proposes a lithium battery coating device and process. Summary of the Invention

[0006] This invention provides a lithium battery coating device and process, which can solve the problem in the prior art where lithium battery coating equipment directly uses gripper force to press the battery and the coating film together over a large area instantaneously, which easily forms closed air bubbles that cannot be eliminated.

[0007] A lithium battery coating apparatus includes a coating machine frame, wherein a protective film for coating lithium batteries is slidably disposed inside the coating machine frame, and a pushing mechanism is disposed between the coating machine frame and the protective film, the pushing mechanism comprising: A protrusion is slidably disposed inside the frame of the coating machine, the protrusion being in contact with the protective film; a guide block is fixedly connected to the surface of the frame of the coating machine, the guide block being located above the protrusion, the cross-section of the guide block being triangular, and the inclined surface being in contact with the protective film; A clamping part is rotatably disposed inside the frame of the coating machine. The clamping part includes a support rod and a push rod. The support rod and the push rod are symmetrically arranged relative to the protrusion. The protrusion is slidably disposed on the surface of the support rod.

[0008] Optionally, the protrusion includes a driving rod and a contact block, the contact block is slidably disposed on the surface of the driving rod, the contact block is in contact with the protective film, and the clamping part is slidably connected to the driving rod.

[0009] Optionally, the cross-section of the driving rod is L-shaped, a sliding groove is formed on the surface of the driving rod, and a sliding shaft is fixedly connected to the surface of the contact block, the sliding shaft being adapted to the sliding groove.

[0010] Optionally, an adjusting block is slidably arranged inside the frame of the coating machine, the pushing rod is rotatably arranged on the surface of the adjusting block, an adjusting rod is rotatably connected inside the frame of the coating machine, a protruding shaft is fixedly connected to the surface of the adjusting block, and the adjusting rod is threadedly connected to the protruding shaft.

[0011] Optionally, a control rod is rotatably connected inside the adjusting block, the control rod is threadedly connected to the support rod, and two sliding rods are fixedly connected to the surface of the push rod, with the support rod slidably disposed between the two sliding rods.

[0012] Optionally, a sliding column is slidably connected inside the adjusting block, and meshing teeth are fixedly connected to the surface of the sliding column. Several sliding teeth are fixedly connected to the surface of the push rod. The several sliding teeth are arranged in a circular array on the surface of the push rod with the sliding column as the center. The meshing teeth and the sliding teeth mesh with each other. A connecting spring is fixedly connected between the sliding column and the adjusting block.

[0013] Optionally, a protruding column is fixedly connected to the surface of the sliding column, and a moving groove is formed on the surface of the adjusting block, wherein the protruding column is adapted to the moving groove.

[0014] Optionally, the control rod has an inner groove on its surface, and an insertion rod is slidably connected to the surface of the sliding column, the insertion rod being adapted to the inner groove.

[0015] Optionally, a drive shaft is fixedly connected to the surface of the driving rod, a drive rod is rotatably connected inside the push rod, the drive rod is threadedly connected to the drive shaft, and vertical grooves are formed on the surfaces of the sliding column and the control rod, with the drive rod adapted to the vertical grooves.

[0016] A lithium battery coating process includes the following steps: S1: Feed the protective film into the wrapping machine frame so that the protective film adheres to the outside of the guide block and the contact block; S2: Place the lithium battery on the surface of the coating machine frame, start the motor, and move the lithium battery to the protective film side. The lithium battery first contacts the protective film area pushed out by the contact block. As the lithium battery continues to push, the contact block slides on the surface of the push rod at the same time. The air between the protective film and the side of the lithium battery is gradually discharged outward, completing the initial bonding of the starting side. S3: After the initial bonding is completed, the lithium battery continues to move horizontally, and the coating of the remaining surfaces of the lithium battery is completed in sequence. During the horizontal movement, the support rod and the push rod gradually squeeze the protective film, and gradually expel the air between the protective film and the remaining surfaces, thus completing the coating of the lithium battery on three sides.

[0017] Compared with the prior art, the beneficial effects of the present invention are: The system includes a protrusion and a clamping part located inside the frame of the coating machine. The protrusion adheres to the protective film, and a guide block, triangular in shape, is positioned above the protrusion to contact the protective film. This guide block guides the protective film to change position, allowing the protective film in contact with the protrusion to protrude beyond the vertical protective film. When the clamping part pushes the lithium battery towards one side of the protective film, the lithium battery first contacts the protruding area of ​​the protective film, gradually completing the initial compression from point to surface. Air trapped between the protective film and the side of the lithium battery can gradually escape along the unbonded area, preventing the formation of air bubbles due to large-area instantaneous compression. After the protrusion separates from the lithium battery, the clamping part can push the protective film to cover the lithium battery and push away the air between the protective film and the lithium battery, ensuring that no air bubbles remain between the protective film covering the lithium battery surface and the lithium battery. This improves the tightness of the coating and ensures stable product quality after coating. The contact block in the protrusion that contacts the protective film is detachable. At the same time, the distance between the push rod and the support rod can be changed by the control rod thread. The push rod and the support rod can slide and change position inside the coating machine frame. In this way, the protrusion length of the protrusion can be adjusted for different specifications of lithium batteries, and the contact block of the appropriate size can be replaced to adapt to the coating operation of different models of lithium batteries, thereby expanding the applicability of the device. Attached Figure Description

[0018] Figure 1 A schematic diagram of a lithium battery coating device and process structure provided by the present invention; Figure 2 A three-dimensional structural view of the pushing mechanism provided by the present invention; Figure 3 An exploded perspective view of the push rod provided by the present invention; Figure 4 An exploded view of the three-dimensional structure of the protruding column provided by the present invention; Figure 5 Provided by the present invention Figure 4 Enlarged view of the local structure at point A in the middle.

[0019] Explanation of reference numerals in the attached figures: 1. Coating machine frame; 2. Protective film; 6. Lithium battery; 31. Protrusion; 32. Guide block; 33. Support rod; 34. Push rod; 311. Driving rod; 312. Contact block; 313. Sliding groove; 41. Adjusting block; 42. Adjusting rod; 43. Protruding shaft; 44. Control rod; 45. Sliding rod; 46. Sliding column; 47. Sliding tooth; 48. Connecting spring; 49. Protruding column; 51. Inner groove; 52. Insertion rod; 53. Drive rod. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0021] like Figures 1 to 5 As shown in the figure, an embodiment of the present invention provides a lithium battery coating device, including a coating machine frame 1, a protective film 2 for wrapping a lithium battery 6 is slidably disposed inside the coating machine frame 1, and a pushing mechanism is disposed between the coating machine frame 1 and the protective film 2, the pushing mechanism including: A protrusion 31 is slidably disposed inside the frame 1 of the wrapping machine, and the protrusion 31 contacts the protective film 2; a guide block 32 is fixedly connected to the surface of the frame 1 of the wrapping machine, the guide block 32 is located above the protrusion 31, the cross-section of the guide block 32 is triangular, and the inclined surface of the guide block 32 contacts the protective film 2; A clamping part is rotatably disposed inside the frame 1 of the coating machine. The clamping part includes a support rod 33 and a push rod 34. The distance between the support rod 33 and the push rod 34 is equal to the height of the lithium battery 6. The support rod 33 and the push rod 34 are symmetrically arranged relative to the protrusion 31. The protrusion 31 is slidably disposed on the surface of the support rod 33. In summary, the lithium battery coating device provided by this embodiment of the invention includes a protrusion 31 and a clamping part disposed inside the coating machine frame 1. The protrusion 31 is attached to the protective film 2, and a guide block 32 is disposed above the protrusion 31 to contact the protective film 2. The guide block 32 is triangular in shape, thereby guiding the protective film 2 to change position, so that the protective film 2 in contact with the protrusion 31 can protrude from the vertical protective film 2. When the clamping part pushes the lithium battery 6 towards the protective film 2, the lithium battery 6 will first contact the area of ​​the protective film 2 protruding from the protrusion 31, and the initial pressing is gradually completed from point to surface. The air originally sandwiched between the protective film 2 and the side of the lithium battery 6 can be gradually discharged outward along the unattached area. This avoids the formation of air bubbles due to large-area instantaneous compression and sealing. After the initial bonding is completed, the clamping part moves horizontally to drive the lithium battery 6 to complete the wrapping process on the remaining surfaces. The initial bonding position will not be squeezed and sealed with air by subsequent compaction processes, thus avoiding the residual sealed air bubbles from the source. This ensures the flatness and fit of the wrapping, improving the protective reliability and appearance quality of the lithium battery 6 wrapping. At the same time, as the lithium battery 6 continues to slide, the clamping part will adhere to the lithium battery 6 and push the protective film 2 to cover the lithium battery 6. During the sliding process of the clamping part, the air in the protective film 2 at the top and bottom positions can be discharged, ensuring that there are no sealed air bubbles between the protective film 2 covering the surface of the lithium battery 6 and the lithium battery 6, improving the tightness of the wrapping and ensuring the stable quality of the wrapped product. In some specific embodiments, the protrusion 31 includes a driving rod 311 and a contact block 312. The contact block 312 is slidably disposed on the surface of the driving rod 311 and is in contact with the protective film 2. The clamping part is slidably connected to the driving rod 311. like Figure 3 and Figure 4 The cross-section of the driving rod 311 is L-shaped, and a sliding groove 313 is provided on the surface of the driving rod 311. A sliding shaft is fixedly connected to the surface of the contact block 312, and the sliding shaft is adapted to the sliding groove 313. The contact block 312 in the protrusion 31 that is attached to the protective film 2 is set to slide on the surface of the drive rod 311, so that the contact block 312 of different heights can be replaced according to the height of the lithium battery 6, adapting to the coating processing requirements of lithium batteries 6 of different specifications. There is no need to replace the overall push mechanism, the device has a wider range of adaptability and is more practical. In some specific implementations, an adjusting block 41 is slidably disposed inside the frame 1 of the coating machine, a pushing rod 34 is rotatably disposed on the surface of the adjusting block 41, an adjusting rod 42 is rotatably connected inside the frame 1 of the coating machine, a protruding shaft 43 is fixedly connected to the surface of the adjusting block 41, the adjusting rod 42 is threadedly connected to the protruding shaft 43, and a protruding block is fixedly connected to the surface of the frame 1 of the coating machine, the protruding block covering the protruding shaft 43; In some specific implementations, a control rod 44 is rotatably connected inside the adjusting block 41. The control rod 44 is threadedly connected to the support rod 33. The control rod 44 passes through the push rod 34. Two sliding rods 45 are fixedly connected to the surface of the push rod 34. The two sliding rods 45 are symmetrically arranged relative to the push rod 34. The support rod 33 is slidably arranged between the two sliding rods 45. When it is necessary to change the distance between the support rod 33 and the push rod 34, rotate the control rod 44 to make the support rod 33 slide on the surface of the sliding rod 45. When the distance between the support rod 33 and the push rod 34 is the same as the height of the lithium battery 6, stop rotating the control rod 44. In some specific implementations, a sliding column 46 is slidably connected inside the adjusting block 41, the control rod 44 passes through the sliding column 46, a meshing tooth is fixedly connected to the side of the sliding column 46 facing the adjusting block 41, a plurality of sliding teeth 47 are fixedly connected to the surface of the push rod 34, and the plurality of sliding teeth 47 are arranged in a circular array on the surface of the push rod 34 with the sliding column 46 as the center. The meshing tooth and the sliding tooth 47 mesh, and a connecting spring 48 is fixedly connected between the sliding column 46 and the adjusting block 41. like Figures 3 to 5 As shown, a protruding column 49 is fixedly connected to the surface of the sliding column 46, and a moving groove is provided on the surface of the adjusting block 41. The protruding column 49 is adapted to the moving groove. In some specific implementations, the control rod 44 has an inner groove 51 on its surface, and the sliding column 46 has an insertion rod 52 slidably connected to its surface, the insertion rod 52 being adapted to the inner groove 51; When it is necessary to change the angle of the push rod 34, pull the sliding column 46 to disengage the meshing teeth from the sliding teeth 47. At this time, the insertion rod 52 can be pushed into the recessed groove 51 to restrict the position of the sliding column 46. Rotate the push rod 34 to change the angle of the push rod 34 relative to the adjusting block 41. When the push rod 34 rotates, it drives the support rod 33 to rotate simultaneously through the sliding rod 45. After the adjustment is completed, release the sliding column 46, and the connecting spring 48 pulls the sliding column 46 to reset. The meshing teeth re-engage with the sliding teeth 47, thus locking the angle of the push rod 34. In some specific implementations, a drive shaft is fixedly connected to the surface of the driving rod 311, a drive rod 53 is rotatably connected inside the pushing rod 34, the drive rod 53 is threadedly connected to the drive shaft, and vertical grooves are opened on the surfaces of the sliding column 46 and the control rod 44, with the drive rod 53 adapted to the vertical grooves. A motor is fixedly connected to the surface of the push rod 34, and the end of the motor output shaft is fixedly connected to the drive rod 53. The motor is electrically connected to an external power source. The motor is a conventional power component in the relevant technical field, and those skilled in the art can select it according to actual needs. The frame 1 of the coating machine is equipped with a film unfolding mechanism, a bonding mechanism and related structures for moving the lithium battery 6, as described in the patent title: A Lithium Battery Protective Film Coating Equipment (Patent Publication No.: CN121662847A). This allows the lithium battery 6 to slide inside the frame 1, and after the lithium battery 6 is bonded to the protective film 2 on three sides, the lithium battery 6 can achieve bonding of the protective film 2 on multiple sides when it moves again. A control element is provided between the two motors and the related structure that drives the lithium battery 6 to move, so as to realize the synchronous sliding of the two protrusions 31 towards each other, and to associate the movement of the lithium battery 6 with the movement of the protrusions 31. When the lithium battery 6 slides to the protective film 2 in the vertical position, the two protrusions 31 can slide to both ends of the side of the lithium battery 6, ensuring the tight fit of the protective film 2 on the side surface and preventing the protrusions 31 from affecting the subsequent movement of the lithium battery 6. The control element can be a combination of multiple components such as a driver and a PLC controller. For example, the motor can be a servo motor, controlled by a dual-axis servo driver, and then controlled by a PLC controller through the dual-axis servo driver. Conventional power components in the technical field to which the control element belongs can be selected by those skilled in the art according to actual needs, and will not be described in detail here. This invention also provides a process for the lithium battery coating apparatus described above, comprising the following steps: S1: Send the protective film 2 into the frame 1 of the wrapping machine, so that the protective film 2 adheres to the outside of the guide block 32 and the contact block 312; S2: Adjust the distance between the support rod 33 and the push rod 34, and the extension position of the contact block 312 according to the size of the lithium battery 6 to be processed, and complete the device debugging; S3: Place the lithium battery 6 on the surface of the wrapping machine frame 1, start the motor, and move the lithium battery 6 to the protective film 2 side. The lithium battery 6 first contacts the area of ​​the protective film 2 pushed out by the contact block 312. As the lithium battery 6 continues to push, the contact block 312 slides on the surface of the push rod 34 at the same time. The bonding area gradually expands from point to surface. The air between the protective film 2 and the side of the lithium battery 6 is gradually discharged outward, completing the initial bonding of the starting side. S4: After the initial bonding is completed, the lithium battery 6 continues to move horizontally, and the coating of the remaining surfaces of the lithium battery 6 is completed in sequence. During the horizontal movement, the support rod 33 and the push rod 34 gradually squeeze the protective film 2, and gradually expel the air between the protective film 2 and the remaining surfaces, thus completing the coating of the lithium battery 6 on three sides.

[0022] Working principle of the invention: The protective film 2 is fed into the frame 1 of the coating machine, so that the protective film 2 adheres to the outside of the guide block 32 and the contact block 312. The lithium battery 6 is placed on the surface of the frame 1 of the coating machine and aligned with the contact block 312. The motor is then started and the lithium battery 6 is moved to one side of the protective film 2. The lithium battery 6 first contacts the area of ​​the protective film 2 pushed out by the contact block 312. As the lithium battery 6 continues to push, the contact block 312 slides on the surface of the push rod 34 at the same time. The bonding area gradually expands from point to surface. The air between the protective film 2 and the side of the lithium battery 6 is gradually discharged outward, completing the initial bonding of the starting side. After the initial bonding is completed, the lithium battery 6 continues to move and completes the coating of the remaining surfaces of the lithium battery 6 in sequence. During the movement, the support rod 33 and the push rod 34 gradually squeeze the protective film 2, gradually expelling the air between the protective film 2 and the remaining surfaces, completing the coating of the three sides of the lithium battery 6.

[0023] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A lithium battery coating device, comprising a coating machine frame (1), wherein a protective film (2) for coating lithium batteries is slidably disposed inside the coating machine frame (1), characterized in that, A pushing mechanism is provided between the coating machine frame (1) and the protective film (2), the pushing mechanism comprising: A protrusion (31) is slidably disposed inside the frame (1) of the coating machine, and the protrusion (31) contacts the protective film (2); a guide block (32) is fixedly connected to the surface of the frame (1) of the coating machine, the guide block (32) is located above the protrusion (31), the cross-section of the guide block (32) is triangular, and the inclined surface contacts the protective film (2); A clamping part is rotatably disposed inside the frame (1) of the coating machine. The clamping part includes a support rod (33) and a push rod (34). The support rod (33) and the push rod (34) are symmetrically disposed relative to the protrusion (31). The protrusion (31) is slidably disposed on the surface of the support rod (33).

2. The lithium battery coating device as described in claim 1, characterized in that, The protrusion (31) includes a drive rod (311) and a contact block (312). The contact block (312) is slidably disposed on the surface of the drive rod (311). The contact block (312) is attached to the protective film (2). The clamping part is slidably connected to the drive rod (311).

3. A lithium battery coating device as described in claim 2, characterized in that, The cross-section of the drive rod (311) is L-shaped, and a sliding groove (313) is provided on the surface of the drive rod (311). A sliding shaft is fixedly connected to the surface of the contact block (312), and the sliding shaft is adapted to the sliding groove (313).

4. A lithium battery coating device as described in claim 2, characterized in that, An adjusting block (41) is slidably arranged inside the frame (1) of the coating machine. The pushing rod (34) is rotatably arranged on the surface of the adjusting block (41). An adjusting rod (42) is rotatably connected inside the frame (1) of the coating machine. A protruding shaft (43) is fixedly connected to the surface of the adjusting block (41). The adjusting rod (42) is threadedly connected to the protruding shaft (43).

5. A lithium battery coating device as described in claim 4, characterized in that, The adjusting block (41) is rotatably connected to a control rod (44), which is threadedly connected to a support rod (33). Two sliding rods (45) are fixedly connected to the surface of the push rod (34), and the support rod (33) is slidably disposed between the two sliding rods (45).

6. A lithium battery coating device as described in claim 5, characterized in that, The adjusting block (41) has a sliding column (46) slidably connected inside. The sliding column (46) has a meshing tooth fixedly connected to its surface. The push rod (34) has a plurality of sliding teeth (47) fixedly connected to its surface. The plurality of sliding teeth (47) are arranged in a circular array on the surface of the push rod (34) with the sliding column (46) as the center. The meshing tooth and the sliding tooth (47) mesh. A connecting spring (48) is fixedly connected between the sliding column (46) and the adjusting block (41).

7. A lithium battery coating device as described in claim 6, characterized in that, The sliding column (46) has a protruding column (49) fixedly connected to its surface, and the adjusting block (41) has a moving groove on its surface. The protruding column (49) is adapted to the moving groove.

8. A lithium battery coating device as described in claim 6, characterized in that, The control rod (44) has an inner groove (51) on its surface, and the sliding column (46) has an insertion rod (52) slidably connected to its surface. The insertion rod (52) is adapted to the inner groove (51).

9. A lithium battery coating device as described in claim 6, characterized in that, The drive rod (311) is fixedly connected to a drive shaft, and the push rod (34) is rotatably connected to a drive rod (53). The drive rod (53) is threadedly connected to the drive shaft. The sliding column (46) and the control rod (44) have vertical grooves on their surfaces, and the drive rod (53) is adapted to the vertical grooves.

10. A lithium battery coating process, characterized in that, The lithium battery coating apparatus according to any one of claims 1-9 includes the following steps: S1: Send the protective film (2) into the frame (1) of the wrapping machine, so that the protective film (2) adheres to the outside of the guide block (32) and the contact block (312); S2: Place the lithium battery on the surface of the coating machine frame (1), start the motor, and move the lithium battery to the protective film (2) side. The lithium battery first contacts the area of ​​the protective film (2) pushed out by the contact block (312). As the lithium battery continues to push, the contact block (312) slides on the surface of the push rod (34) at the same time. The air between the protective film (2) and the side of the lithium battery is gradually discharged outward, completing the initial bonding of the starting side. S3: After the initial bonding is completed, the lithium battery continues to move horizontally, and the coating of the remaining surfaces of the lithium battery is completed in sequence. During the horizontal movement, the support rod (33) and the push rod (34) gradually squeeze the protective film (2), and gradually expel the air between the protective film (2) and the remaining surfaces, thus completing the coating of the lithium battery on three sides.

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