A lithium battery separator flattening and cutting integrated machine and its usage method

Abstract

The present invention relates to the technical field of lithium battery processing equipment, and discloses a lithium battery separator flattening and cutting integrated machine and its usage method. The lithium battery separator flattening and cutting integrated machine includes a chassis and a cutting mechanism arranged inside the chassis. On one side of the cutting mechanism, a first feeding roller, a second feeding roller, and a third feeding roller are arranged, and a winding roller is arranged on the other side of the cutting mechanism; the present invention supports the lithium battery separator through a base film and a top film, so that the traction force between the rollers can be dispersed on the base film and the top film that are not easily stretched, avoiding the problem that the lithium battery separator is easily deformed under tension, resulting in poor cutting accuracy. Moreover, the lithium battery separator is clamped between two top films and a base film with relatively small elasticity for cutting, which can absorb the pressure of the cutting knife to a certain extent, reduce the damage to the film, keep the lithium battery separator stable during the cutting process, and not easily deform, so that the cut is relatively smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing equipment, and particularly to a lithium battery separator flattening and cutting integrated machine and its usage method. Background Art

[0002] The lithium battery separator is a crucial component in lithium-ion batteries. Located between the positive and negative electrodes, its main function is to isolate the positive and negative electrodes, prevent physical contact while ensuring that lithium ions can pass through the micropores and transfer between the positive and negative electrodes. Such a microporous membrane not only needs to have high ion permeability to support the efficient charging and discharging of the battery, but also should have sufficient mechanical strength and thermal stability to maintain the structural integrity and safe operation of the battery. High-quality separators can improve the overall performance of the battery, extend its service life, and enhance safety, and are one of the key materials in the development of modern lithium battery technology.

[0003] The lithium battery separator needs to be cut. The main reasons for flattening and cutting the lithium battery separator are to ensure the accuracy and consistency during battery assembly, and improve the battery performance and safety. This process can eliminate wrinkles and non-uniformities on the separator material, optimize its microporous structure, thus ensuring the smooth transmission of lithium ions and preventing direct contact between the electrodes, avoiding short circuits and related safety risks.

[0004] Chinese Patent CN220864080U discloses a flattening and cutting device for lithium battery separators, belonging to the technical field of lithium battery separator flattening and cutting. Aiming at the problems of wrinkles generated during cutting and incomplete cutting of the separator, it includes a processing plate and a top plate. A diversion groove is opened at the top end of the processing plate, and a cutting groove is opened at the center of the diversion groove. A servo cylinder is fixed at the top end of the top plate. The driving end of the servo cylinder is fixed with an installation box. An activity groove is opened at the bottom end of the installation box. A rotating rod is fixed on the inner wall of the activity groove. A rotating part is rotatably connected to the outside of the rotating rod. The other end of the rotating part is fixed with an installation frame. Connecting blocks are fixed at both opposite ends of the installation frame; through the mutual cooperation of the servo cylinder, installation box, activity groove, rotating rod, rotating part, installation frame, connecting blocks, flattening roller, and extrusion spring in the present invention, the battery separator can be flattened during cutting, preventing wrinkles from occurring and affecting the cutting efficiency.

[0005] As described in the above patent, the existing lithium battery separator cutting device generally places the separator on a platform and then directly uses a blade to cut the lithium battery separator. Since the texture of the lithium battery separator is relatively soft and has a certain elasticity, during cutting, if it is directly placed on the platform, due to the large hardness of the platform, the blade generates pressure on the film during the cutting process, which may cause the separator at the cut to deform and form defects, and only one separator can be cut at a time, unable to perform continuous cutting operations, resulting in low cutting efficiency.

[0006] Therefore, it is necessary to provide a lithium battery separator leveling and cutting integrated machine and its usage method to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a lithium battery separator leveling and cutting integrated machine and its usage method. The lithium battery separator is clamped between two top films and a base film with relatively low elasticity for cutting, which can absorb the pressure of the cutting knife to a certain extent, keep the lithium battery separator stable during the cutting process, and is not prone to deformation.

[0008] The above technical purpose of the present invention is achieved through the following technical solutions: A lithium battery separator leveling and cutting integrated machine includes a chassis and a cutting mechanism arranged inside the chassis. One side of the cutting mechanism is provided with a first feeding roller, a second feeding roller, and a third feeding roller, and the other side of the cutting mechanism is provided with a winding roller. The first feeding roller, the second feeding roller, the third feeding roller, and the winding roller are all rotationally connected to the chassis. A cutting table is arranged below the cutting mechanism. One side of the cutting table is provided with two first leveling rollers, and the other side of the cutting table is provided with two second leveling rollers. The first feeding roller is used to install a roll of top film, the second feeding roller is used to install a roll of lithium battery separator, and the third feeding roller is used to install a roll of base film. A gluing mechanism is arranged on one side of the cutting mechanism. During cutting, the top film, the lithium battery separator, and the base film pass through between the two first leveling rollers and the two second leveling rollers, and on the cutting table, the cutting mechanism cuts the top film and the lithium battery separator. After gluing the surface of the top film through the gluing mechanism, it is then wound onto the winding roller.

[0009] The further setting of the present invention is: The cutting mechanism includes a cylinder and a mounting frame. The cylinder is fixedly installed at the top of the chassis, the output end of the cylinder is fixedly installed with a cross plate, the cross plate is fixedly connected with the mounting frame, and a cutting knife is sleeved outside the mounting frame.

[0010] The further setting of the present invention is: A pressing block is slidably installed up and down inside the mounting frame, and an elastic connection component is connected above the pressing block. The pressing block is elastically connected to the cross plate through the elastic connection component.

[0011] The further setting of the present invention is: The elastic connection component includes a first cylinder, a first connecting rod, and a spring. The top end of the first connecting rod is fixedly connected with the cross plate, the bottom end of the first cylinder is fixedly connected with the pressing block, the first connecting rod is slidably matched with the first cylinder, a spring is arranged inside the first cylinder, and the first connecting rod is elastically connected to the bottom wall of the first cylinder through the spring.

[0012] A further setting of the present invention is that: the tape sticking mechanism includes a placement box fixedly installed inside the chassis. The placement box is arranged on one side of the installation frame. A fourth feeding roller is rotatably installed inside the placement box. A roll of tape is installed on the fourth feeding roller. An extension opening is formed at the bottom of the placement box. A guiding roller is arranged above the extension opening. The tape at the extension opening bypasses the guiding roller and then adheres to the top film.

[0013] A further setting of the present invention is that: connecting frames are fixedly installed on both sides of the installation frame. A positioning rod is fixedly installed at the bottom end of the connecting frame. A heat sealing strip is fixedly installed at the bottom end of the positioning rod.

[0014] A further setting of the present invention is that: a groove is formed at the bottom of the pressing block. A pressing plate is slidably arranged inside the groove. A second cylinder is fixedly installed inside the pressing block. A first piston is slidably installed inside the first cylinder. The bottom end of the first connecting rod is fixedly connected to the first piston. A second piston is slidably installed inside the second cylinder. The bottom end of the second piston is fixedly connected to a second connecting rod. The bottom end of the second connecting rod penetrates through the bottom wall of the second cylinder and is fixedly connected to the pressing plate. A communication hole is arranged between the first cylinder and the second cylinder, so that the first cylinder is communicated with the second cylinder.

[0015] A further setting of the present invention is that: the outer side wall of the pressing block is attached to the inner side wall of the cutting knife. The outer side wall of the pressing plate is attached to the inner side wall of the groove at the bottom of the pressing block. The pressing plate is made of breathable steel material.

[0016] A further setting of the present invention is that: ventilation holes are formed in the pressing block.

[0017] The usage method of the above-mentioned lithium battery diaphragm flattening and cutting integrated machine includes the following steps:

[0018] S1. Pull out the top film, lithium battery diaphragm and base film from the first feeding roller, the second feeding roller and the third feeding roller respectively, and then pass through between the two first flattening rollers, so that the top film, lithium battery diaphragm and base film are flattened and adhered together. After passing through the cutting table, then pass through between the two second flattening rollers and wind around the winding roller.

[0019] S2. When the top film, lithium battery diaphragm and base film pass through the cutting table, the top film and the lithium battery diaphragm are cut into sheet-like structures by the cutting mechanism. At the same time, during cutting, the heat sealing strip presses on the top film, and the top film and the base film are bonded together by hot pressing.

[0020] S3. Before passing through the second flattening roller, the tape led out from the tape sticking mechanism adheres to the top film.

[0021] In summary, the present invention has the following beneficial effects:

[0022] 1. By integrating the functions of leveling and cutting the lithium battery separator into one machine, the present invention realizes continuous cutting operations, greatly improving the cutting efficiency. The lithium battery separator is supported by the base film and the top film, enabling the traction force between the rollers to be dispersed on the non-easily stretchable base film and top film, avoiding the problem that the lithium battery separator is prone to deformation under tension, resulting in poor cutting accuracy. Moreover, when cutting the lithium battery separator sandwiched between two top films and base films with relatively low elasticity, it can absorb the pressure of the cutting knife to a certain extent, reduce damage to the film, keep the lithium battery separator stable during the cutting process, and not easily deform, thus making the cut more smooth. By setting an adhesive pasting mechanism on the top film, the tape is adhered to the top film to fix the cut top film and prevent the cut sheet-like top film and the lithium battery separator from falling off. At the same time, the setting of the tape makes it convenient and fast to take out the sheet-like lithium battery separator for use, only by tearing the tape;

[0023] 2. By designing the groove at the bottom of the pressing block and the slidable-up-and-down pressing plate, and setting the first cylinder and the second cylinder with interconnected interiors, the present invention realizes effective pressing and smooth separation of the top film, bringing multiple beneficial effects: First, controlling the pressing plate to move upward before the pressing block reduces the contact area with the top film, effectively preventing the problem that the top film is lifted during the rising of the pressing block, ensuring the stability of the position of the top film, and being beneficial to maintaining the cutting accuracy; Second, the outer wall of the pressing block is closely attached to the inner wall of the cutting knife, improving the cutting effect of the cutting knife on the lithium battery separator and enhancing the consistency and quality of the product; In addition, the outer wall of the pressing plate is closely attached to the inner wall of the groove at the bottom of the pressing block, reducing the possibility of leaving pressing marks on the top film and helping to maintain the integrity and aesthetics of the top film; At the same time, the pressing plate made of breathable steel ensures that gas can pass through the pressing plate smoothly, ensuring the discharge of the gas below when the pressing block adheres to the top film and promoting the smooth downward movement of the pressing plate; Finally, the ventilation holes opened on the pressing block enable the gas above the pressing plate to be discharged in time, ensuring the smoothness of the up-and-down movement of the pressing block, maintaining the air pressure balance inside the pressing block at the same time, and improving the stability and reliability of the equipment. The comprehensive application of these design details not only optimizes the cutting process of the lithium battery separator, improves the production efficiency and product quality, but also enhances the operation performance and stability of the equipment. Description of the Drawings

[0024] Figure 1 It is a three-dimensional sectional structure schematic diagram of the present invention;

[0025] Figure 2 It is a front sectional structure schematic diagram of the present invention when in use;

[0026] Figure 3 It is a front structure schematic diagram of the adhesive pasting mechanism of the present invention;

[0027] Figure 4 3D structural schematic diagram of the cutting mechanism of the present invention;

[0028] Figure 5 of the present invention Figure 4 Enlarged structural schematic diagram at position A;

[0029] Figure 6 Cross-sectional structural schematic diagram of the elastic connection component and the second cylinder of the present invention;

[0030] Figure 7 Cross-sectional structural schematic diagram of the cutting mechanism of the present invention;

[0031] Figure 8 Top-view structural schematic diagram of the product prepared by the present invention;

[0032] Figure 9 Front-view structural schematic diagram of the product prepared by the present invention.

[0033] In the figure: 1, chassis; 2, first loading roller; 3, second loading roller; 4, third loading roller; 5, top film; 6, lithium battery separator; 7, base film; 8, cylinder; 9, mounting frame; 10, cross plate; 11, cutting knife; 12, pressing block; 13, elastic connection component; 131, first cylinder; 132, first connecting rod; 133, spring; 14, first piston; 15, second cylinder; 16, second connecting rod; 17, second piston; 18, communication hole; 19, pressing plate; 20, ventilation hole; 21, connecting frame; 22, positioning rod; 23, heat seal strip; 24, placement box; 25, fourth loading roller; 26, tape; 27, guiding roller; 28, cutting table; 29, first leveling roller; 30, second leveling roller; 31, bonding part; 32, winding roller. Detailed implementation manners

[0034] The following will further describe the present invention in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] Please refer to Figures 1 to 6, in an embodiment of the present invention, a lithium battery separator leveling and cutting integrated machine includes a chassis 1 and a cutting mechanism disposed inside the chassis 1. On one side of the cutting mechanism, a first feeding roller 2, a second feeding roller 3, and a third feeding roller 4 are provided. On the other side of the cutting mechanism, a winding roller 32 is provided. The first feeding roller 2, the second feeding roller 3, the third feeding roller 4, and the winding roller 32 are all rotatably connected to the chassis 1. The first feeding roller 2, the second feeding roller 3, the third feeding roller 4, and the winding roller 32 can all rotate. A motor can be provided on the chassis 1 to drive their rotation. The first feeding roller 2, the second feeding roller 3, the third feeding roller 4, and the winding roller 32 can all be disassembled and replaced. Below the cutting mechanism, there is a cutting table 28. On one side of the cutting table 28, there are two first leveling rollers 29. On the other side of the cutting table 28, there are two second leveling rollers 30. The two first leveling rollers 29 and the two second leveling rollers 30 are both distributed vertically. The first feeding roller 2 is used to install the rolled top film 5. The second feeding roller 3 is used to install the rolled lithium battery separator 6. The third feeding roller 4 is used to install the rolled base film 7. Both the top film and the base film 7 are made of polyethylene material. On one side of the cutting mechanism, there is an adhesive pasting mechanism. During cutting, the top film 5, the lithium battery separator 6, and the base film 7 pass through between the two first leveling rollers 29 and the two second leveling rollers 30, and on the cutting table 28, the cutting mechanism cuts the top film and the lithium battery separator 6. After the surface of the top film is pasted with adhesive by the adhesive pasting mechanism, it is then wound onto the winding roller 32.

[0036] It should be noted that the thickness of the base film 7 is about 1 mm, and the thickness of the top film 5 is about 0.5 mm. The base film 7 is relatively thick, making it difficult for the cutting knife 11 to cut through the base film 7. The base film 7 and the top film 5 are made of polyethylene material with low elasticity, so that the deformation generated when the cutting knife 11 cuts is relatively small, resulting in a better cutting effect for the inner lithium battery separator 6.

[0037] In this embodiment, preferably, the cutting mechanism includes a cylinder 8 and a mounting frame 9. The cylinder 8 is fixedly installed at the top of the chassis 1. The output end of the cylinder 8 is fixedly installed with a cross plate 10. The cross plate 10 is fixedly connected to the mounting frame 9. A cutting knife 11 is sleeved outside the mounting frame 9. The cutting edge of the cutting knife 11 is a closed structure, thereby cutting the lithium battery separator 6 into independent pieces. The shape of the cutting edge of the cutting knife 11 can be adjusted according to the use requirements, such as rectangular, circular, etc. By the telescopic movement of the output end of the cylinder 8, the cross plate 10 can be driven to move up and down, thereby driving the mounting frame 9 to move up and down, so that the cutting knife 11 moves up and down to cut the top film 5 and the lithium battery separator 6 on the cutting table 28. The cut top film 5 and lithium battery separator 6 are in an independent sheet structure.

[0038] In this embodiment, preferably, a pressing block 12 is slidably mounted up and down inside the mounting frame 9. An elastic connection assembly 13 is connected above the pressing block 12. The pressing block 12 is elastically connected to the cross plate 10 through the elastic connection assembly 13. The elastic connection assembly 13 includes a first cylinder 131, a first connecting rod 132 and a spring 133. The top end of the first connecting rod 132 is fixedly connected to the cross plate 10. The bottom end of the first cylinder 131 is fixedly connected to the pressing block 12. The first connecting rod 132 is slidably matched with the first cylinder 131. A spring 133 is arranged inside the first cylinder 131. The first connecting rod 132 is elastically connected to the bottom wall of the first cylinder 131 through the spring 133. During cutting, as the mounting frame 9 moves downward, the pressing block 12 first presses on the top film 5, thereby fixing the top film 5. As the mounting frame 9 continues to move downward, the spring 133 is gradually compressed, and the cutting knife 11 gradually moves downward, so that the cutting knife 11 cuts the top film 5 and the lithium battery separator 6.

[0039] In this embodiment, preferably, the glue sticking mechanism includes a placement box 24. The placement box 24 is fixedly mounted inside the chassis 1. The placement box 24 is arranged on one side of the mounting frame 9 and above the second flattening roller 30. A fourth feeding roller 25 is rotatably mounted inside the placement box 24. A roll of adhesive tape 26 is mounted on the fourth feeding roller 25. An extension opening is formed at the bottom of the placement box 24. A guiding roller 27 is arranged above the extension opening. The adhesive tape 26 at the extension opening bypasses the guiding roller 27 and then adheres to the top film 5, thereby fixing the cut top film 5 and preventing the cut top film 5 and the lithium battery separator 6 from falling off. Moreover, the arrangement of the adhesive tape 26 enables, when taking out the sheet-shaped lithium battery separator 6 for use, just tearing the adhesive tape 26 to tear off the sheet-shaped top film 5 above the sheet-shaped lithium battery separator 6 together, so as to facilitate taking out the cut lithium battery separator 6 for use.

[0040] In this embodiment, preferably, connecting frames 21 are fixedly installed on both sides of the installation frame 9, and positioning rods 22 are fixedly installed at the bottom ends of the connecting frames 21. When the positioning rods 22 press on the top film 5, the cutting knife 11 just finishes cutting the lithium battery separator 6. When setting, the height of the bottom wall of the cutting knife 11 is less than the height of the bottom wall of the positioning rod 22, and the height difference is slightly greater than the sum of the thicknesses of the top film 5 and the lithium battery separator 6, so that when the positioning rod 22 presses on the top film 5, the cutting knife 11 cuts off the lithium battery separator 6 without cutting off the base film 7, thereby preferably positioning the cutting depth of the cutting knife 11; a heat-sealing strip 23 is fixedly installed at the bottom end of the positioning rod 22, and the heat-sealing strip 23 can generate heat and can be heated by an electric heating wire. Thus, when the heat-sealing strip 23 presses on the top film 5, the top film 5 and the base film 7 are bonded together by hot pressing. Heat-sealing strips 23 can also be provided at opposite positions on the cutting table 28 to improve the hot-pressing efficiency. The hot-pressing principle is a prior art and can refer to the principle of a hot-pressing sealer, which will not be described in detail here. When setting the heat-sealing strip 23, refer to Figure 8 , the width of the lithium battery separator 6 should be less than the distance between the two positioning rods 22, so that the heat-sealing strip 23 will not press on the lithium battery separator 6 to prevent the lithium battery separator 6 from interfering with the bonding of the top film 5 and the base film 7.

[0041] During specific use, the top film 5, the lithium battery separator 6, and the base film 7 are passed through between the two first flattening rollers 29. After being extruded, flattened, and adhered by the two first flattening rollers 29, they pass over the cutting table 28, and on the cutting table 28, the top film 5 and the lithium battery separator 6 are cut into a rectangular sheet structure by a cutting mechanism. During cutting, the winding roller 32 stops rotating, and the output end of the air cylinder 8 drives the installation frame 9 to move downward through the cross plate 10. As the installation frame 9 moves downward, the pressing block 12 first presses on the top film 5 to fix the top film 5. As the installation frame 9 continues to move downward, the spring 133 is gradually compressed, and the cutting knife 11 gradually moves downward, so that the cutting knife 11 cuts the top film 5 and the lithium battery separator 6 into a rectangular sheet structure. At the same time, during cutting, the heat-sealing strip 23 presses on the top film 5, and the top film 5 and the base film 7 are bonded together by hot pressing to protect the internal lithium battery separator 6 from falling off. Subsequently, the cutting knife 11 and the pressing block 12 are moved away, and then the winding roller 32 is driven to rotate continuously, so that the top film 5, the lithium battery separator 6, and the base film 7 pass through between the two second flattening rollers 30. Before passing through the second flattening rollers 30, the tape 26 led out from the tape-applying mechanism adheres to the top film 5 to fix the cut top film 5 and prevent the cut top film 5 and the lithium battery separator 6 from falling off.

[0042] Refer to Figure 8 and Figure 9, the structure of the product finally prepared by the present invention is as follows. The product is sequentially provided with a tape 26, a top film 5, a lithium battery separator 6, and a base film 7 from top to bottom. Two bonding parts 31 are formed by hot pressing on both sides. In this part, the top film 5 and the base film 7 are bonded together to protect the internal lithium battery separator 6. The lithium battery separator 6 and the top film 5 in a rectangular shape are cut by a cutting knife 11. When in use, the rectangular top film 5 can be torn off by tearing the tape 26, so as to conveniently take out the rectangular lithium battery separator 6.

[0043] The present invention also discloses a method for using an integrated machine for leveling and cutting a lithium battery separator 6, including the following steps:

[0044] S1. The top film 5, the lithium battery separator 6, and the base film 7 are respectively drawn out from the first feeding roller 2, the second feeding roller 3, and the third feeding roller 4, and then pass through between two first leveling rollers 29, so that the top film 5, the lithium battery separator 6, and the base film 7 are leveled and adhered together. After passing through the cutting table 28, they pass through between two second leveling rollers 30 and are wound on the winding roller 32.

[0045] S2. When the top film 5, the lithium battery separator 6, and the base film 7 pass through the cutting table 28, the top film 5 and the lithium battery separator 6 are cut into sheet structures by a cutting mechanism. At the same time, during cutting, the heat sealing strip 23 presses on the top film 5, and the top film 5 and the base film 7 are bonded together by hot pressing.

[0046] S3. Before passing through the second leveling roller 30, the tape 26 led out from the tape sticking mechanism is adhered to the top film 5.

[0047] When the bottom of the pressing block 12 is a plane, after cutting, as the pressing block 12 moves upward, since the contact area between the pressing block 12 and the top film 5 is large and the contact surface is relatively smooth, it is easy to suck the top film 5 upward. To solve this problem, the following embodiments are provided.

[0048] Please refer to Figures 4 to 7, in the embodiment of the present invention, a groove is formed at the bottom of the pressing block 12, and a pressing plate 19 is slidably arranged in the groove. A second cylinder 15 is fixedly installed inside the pressing block 12. A first piston 14 is slidably installed inside the first cylinder 131. The bottom end of the first connecting rod 132 is fixedly connected to the first piston 14. A second piston 17 is slidably installed inside the second cylinder 15. The bottom end of the second piston 17 is fixedly connected to a second connecting rod 16. The bottom end of the second connecting rod 16 penetrates through the bottom wall of the second cylinder 15 and is fixedly connected to the pressing plate 19. A communication hole 18 is arranged between the first cylinder 131 and the second cylinder 15, so that the first cylinder 131 is communicated with the second cylinder 15. When the pressing block 12 moves downward to contact the top film 5, as the cross plate 10 continues to move downward, the cross plate 10 pushes the first connecting rod 132 downward, causing the first piston 14 to move downward, thereby inputting the gas in the first cylinder 131 into the second cylinder 15 through the communication hole 18, driving the second piston 17 to move downward. When the second piston 17 moves downward, it drives the pressing plate 19 to move downward through the second connecting rod 16, so that the pressing plate 19 presses on the top film 5. After the cutting is completed, as the output end of the cylinder 8 drives the cross plate 10 to move upward, the cross plate 10 first drives the first connecting rod 132 to move upward, causing the first piston 14 to move upward, so that the gas in the second cylinder 15 enters the first cylinder 131, and the second piston 17 drives the pressing plate 19 to move upward through the second connecting rod 16, so that the pressing plate 19 enters the groove. Since the pressing block 12 still presses on the top film 5 at this time, the upward movement of the pressing plate 19 will not suck up the top film 5. Subsequently, the pressing block 12 moves upward. Since the contact area between the pressing block 12 and the top film 5 is small at this time, the top film 5 will not be sucked up either, thus avoiding sucking up the top film 5 during the upward movement of the top block.

[0049] In this embodiment, preferably, the outer side wall of the pressing block 12 is attached to the inner side wall of the cutting knife 11, so that the cutting knife 11 can cut better. The outer side wall of the pressing plate 19 is attached to the inner side wall of the groove at the bottom of the pressing block 12, so that the pressing plate 19 and the pressing block 12 are not likely to leave indentations on the top film 5. The pressing plate 19 is made of breathable steel material, so that gas can pass through the pressing plate 19 to prevent the gas below the pressing plate 19 from being difficult to discharge when the pressing block 12 is attached to the top film 5, resulting in difficulty for the pressing plate 19 to move downward.

[0050] In this embodiment, preferably, a ventilation hole 20 is formed in the pressing block 12, so that the gas above the pressing plate 19 can be discharged through the ventilation hole 20.

[0051] The above is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A lithium battery diaphragm flattening and cutting machine, comprising a chassis (1) and a cutting mechanism arranged in the chassis (1), characterized in that: A first feeding roller (2), a second feeding roller (3) and a third feeding roller (4) are arranged on one side of the cutting mechanism, and a winding roller (32) is arranged on the other side of the cutting mechanism. The first feeding roller (2), the second feeding roller (3), the third feeding roller (4) and the winding roller (32) are all rotatably connected to the chassis (1). A cutting table (28) is arranged below the cutting mechanism. Two first leveling rollers (29) are arranged on one side of the cutting table (28), and two second leveling rollers (30) are arranged on the other side of the cutting table (28). The first feeding roller (2) is used to install A rolled top film (5) is installed, a second loading roller (3) is used to install a rolled lithium battery separator (6), and a third loading roller (4) is used to install a rolled base film (7). A gluing mechanism is provided on one side of the cutting mechanism. During cutting, the top film (5), the lithium battery separator (6) and the base film (7) pass between two first leveling rollers (29) and two second leveling rollers (30), and the top film (5) and the lithium battery separator (6) are cut on a cutting table (28) by the cutting mechanism. After the top film (5) is glued by the gluing mechanism, it is wound onto a winding roller (32); The cutting mechanism comprises a cylinder (8) and a mounting frame (9), the cylinder (8) being fixedly mounted on the top of the chassis (1), a transverse plate (10) being fixedly mounted on the output end of the cylinder (8), the transverse plate (10) being fixedly connected to the mounting frame (9), and a cutting knife (11) being sleeved on the outer side of the mounting frame (9); A pressing block (12) is slidably mounted in the interior of the mounting frame (9) up and down, an elastic connection component (13) is connected to the top of the pressing block (12), and the pressing block (12) is elastically connected to the horizontal plate (10) via the elastic connection component (13); The elastic connection assembly (13) comprises a first cylinder (131), a first connecting rod (132) and a spring (133); the top end of the first connecting rod (132) is fixedly connected to the transverse plate (10); the bottom end of the first cylinder (131) is fixedly connected to the pressure block (12); the first connecting rod (132) and the first cylinder (131) are slidably matched; a spring (133) is provided in the first cylinder (131); and the first connecting rod (132) is elastically connected to the bottom wall of the first cylinder (131) via the spring (133); The bottom of the pressure block (12) is provided with a groove, a pressure plate (19) is slidably arranged in the groove, a second cylinder (15) is fixedly installed inside the pressure block (12), a first piston (14) is slidably installed inside the first cylinder (131), the bottom end of the first connecting rod (132) is fixedly connected to the first piston (14), a second piston (17) is slidably installed inside the second cylinder (15), the bottom end of the second piston (17) is fixedly connected to the second connecting rod (16), the bottom end of the second connecting rod (16) passes through the bottom wall of the second cylinder (15) and is fixedly connected to the pressure plate (19), a connecting hole (18) is arranged between the first cylinder (131) and the second cylinder (15), so that the first cylinder (131) and the second cylinder (15) are connected; The outer wall of the pressing block (12) fits with the inner wall of the cutting blade (11), the outer wall of the pressing plate (19) fits with the inner wall of the bottom groove of the pressing block (12), and the pressing plate (19) is made of breathable steel; a vent hole (20) is provided on the pressing block (12).

2. The lithium battery diaphragm flattening and cutting machine according to claim 1, characterized in that: The adhesive laminating mechanism comprises a placement box (24), the placement box (24) being fixedly mounted in the chassis (1), the placement box (24) being arranged on one side of the mounting frame (9), a fourth loading roller (25) being rotatably mounted in the placement box (24), a rolled adhesive tape (26) being mounted on the fourth loading roller (25), a protruding opening being formed at the bottom of the placement box (24), a guide roller (27) being arranged above the protruding opening, the adhesive tape (26) at the protruding opening passing over the guide roller (27) and then being adhered to the top film (5).

3. The lithium battery diaphragm flattening and cutting machine according to claim 1, characterized in that: Connecting frames (21) are fixedly mounted on both sides of the mounting frame (9), positioning rods (22) are fixedly mounted on the bottom ends of the connecting frames (21), and heat sealing strips (23) are fixedly mounted on the bottom ends of the positioning rods (22).

4. A method for using a lithium battery diaphragm flattening and cutting machine as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1. The top film (5), the lithium battery separator (6) and the base film (7) are pulled out from the first feeding roller (2), the second feeding roller (3) and the third feeding roller (4) respectively, and then passed between the two first leveling rollers (29) so that the top film (5), the lithium battery separator (6) and the base film (7) are leveled and bonded together, and after passing through the cutting table (28), they are passed between the two second leveling rollers (30) and wound on the winding roller (32); S2. When the top film (5), the lithium battery separator (6) and the base film (7) pass through the cutting table (28), the top film (5) and the lithium battery separator (6) are cut into sheet structures by a cutting mechanism. At the same time, during cutting, the heat sealing strip (23) is pressed on the top film (5), and the top film (5) and the base film (7) are bonded together by heat pressing; S3. Before passing through the second leveling roller (30), the adhesive tape (26) drawn out from the adhesive laminating mechanism is attached to the top film (5).

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