A roller sealing device for reducing extractant consumption in lithium battery diaphragm production

Abstract

The present invention discloses a roller sealing device for reducing the consumption of extractants in the production of lithium battery diaphragms, comprising a support box body arranged outside the drying room outlet, an opening being provided on one side of the support box body, a sealing roller being installed in the opening, one end of the sealing roller being connected to a first power mechanism for driving the sealing roller to rotate, roller seals being provided above and below the sealing roller, a gap being provided between each roller seal and the sealing roller, the diaphragm passing over the sealing roller and passing between the sealing roller and one of the roller seals, at least one roller seal being connected to an upper and lower adjustment mechanism for adjusting the size of the gap between the roller seal and the sealing roller. The present invention arranges a support box body at the drying room outlet, a sealing roller at the side opening of the support box body, and roller seals at the upper and lower sides of the sealing roller. By adjusting the distance between the roller seal and the sealing roller, the size of the gap between the roller seal and the sealing roller is changed to adjust the sealing strength of the drying room outlet, reduce the problem of leakage of the extractant at the drying room outlet, and reduce the influence of the internal and external circulation of the drying room on the wind pressure at the drying room outlet.

Description

Technical Field

[0001] The present invention relates to a roller sealing device for reducing the consumption of an extractant in the production of a lithium battery diaphragm, and belongs to the technical field of lithium ion battery diaphragm production and manufacturing. Background Art

[0002] Lithium batteries are core components of new energy vehicles, and separators are one of their key materials. They separate the positive and negative electrodes and provide a three-dimensional channel for lithium ions to circulate between them. The performance of lithium battery separators determines the battery's interface structure and internal resistance, directly impacting its capacity, cycle life, and safety. High-performance separators are crucial for improving the battery's overall performance.

[0003] In diaphragm production, drying in a drying room is a crucial step after membrane extraction. It dries and shapes the membrane surface after extraction, allowing the extractant to evaporate from the membrane surface. In existing technology, the membrane surface enters the three-draw system directly through the drying room outlet. This wide gap at the drying room outlet creates an unbalanced outlet pressure, making the membrane surface susceptible to the circulating air pressure inside and outside the drying room, thus affecting diaphragm quality. Furthermore, an overly large drying room outlet gap can also cause extractant leakage. Summary of the Invention

[0004] The purpose of the present invention is to provide a roller sealing device for reducing the consumption of extractants in the production of lithium battery diaphragms, so as to solve the technical problems in the prior art of diaphragm production that the outlet of the drying room is greatly affected by the internal and external circulation, the outlet pressure imbalance leads to the decline of diaphragm quality and leakage of extractants.

[0005] The present invention adopts the following technical solution: a roller sealing device for reducing the consumption of extractants in the production of lithium battery diaphragms, comprising a support box body arranged outside the outlet of a drying room, an opening being provided on one side of the support box body, a sealing roller being installed in the opening, one end of the sealing roller being connected to a first power mechanism for driving the sealing roller to rotate, roller seals being provided above and below the sealing roller, each roller seal having a gap with the sealing roller, the diaphragm passing around the sealing roller and passing between the sealing roller and one of the roller seals, at least one roller seal being connected to an upper and lower adjustment mechanism for adjusting the size of the gap between the roller seal and the sealing roller.

[0006] The roller seal includes an upper roller seal and a lower roller seal, which are respectively connected to the support box through an upper support and a lower support. The lower support is connected to the support box through bolts, and the upper support is connected to the adjustment structure, which is a cylinder.

[0007] A transmission roller is provided in the support box body, and a second power mechanism for driving the transmission roller to rotate is provided on the support box body.

[0008] The transmission rollers include a first transmission roller, a second transmission roller, and a third transmission roller. The sealing roller is positioned higher than the first transmission roller and the third transmission roller. The first transmission roller and the third transmission roller are respectively located on both sides below the second transmission roller, and the first transmission roller is close to the sealing roller. The diaphragm first passes around from under the third transmission roller, then passes around from over the second transmission roller, then passes around from under the first transmission roller, and finally passes around from over the sealing roller.

[0009] The transmission roller and sealing roller are both made of aluminum rollers treated by anodizing process.

[0010] A sealing cover plate is provided on the top of the supporting box body, and the sealing cover plate is sealed and installed on the top of the supporting box body.

[0011] The sealing cover plate is provided with a top opening, and a small cover plate is provided at the top opening. One side of the small cover plate is movably connected to the sealing cover plate through a hinge, and the other side of the small cover plate is connected to the sealing cover plate through a rotating handle.

[0012] A connecting strip is provided on one side of the small cover plate where the hinge is provided. A vertically extending long hole is opened on the connecting strip. The long hole corresponds to the position of the bolt hole on the hinge. The connecting strip is fixed between the hinge and the side surface of the small cover plate.

[0013] The two ends of the sealing roller are respectively provided with bearing bushes; the bottom of the supporting box is connected with a supporting frame.

[0014] The roller seal adopts an inner and outer double-layer structure, wherein the inner layer of the roller seal is a sheet-like polytetrafluoroethylene layer and the outer layer is a stainless steel shell.

[0015] Preferably, by connecting a cylinder to the upper sealing roller, the size of the sealing gap between the sealing roller and the upper roller can be quickly changed through the cylinder, and the diaphragm is convenient for bypassing the upper part of the sealing roller.

[0016] Preferably, a transmission roller is provided in the supporting box, and the diaphragm passes over the sealing roller after passing through the transmission roller, which can be used as a shielding surface to form an air duct, which is used to reduce the impact of the internal and external circulation inside the drying room on the outlet air pressure, increase the adjustable range of the internal and external circulation inside the drying room, and further improve the A-grade rate.

[0017] Preferably, the transmission rollers include three transmission rollers arranged in an M shape, which optimizes the position layout of the transmission rollers inside the equipment, and the shielding surface strength is higher after the film surface passes through the transmission rollers in sequence; each roller is powered by a servo motor, and the tension and speed are controlled. The roller speed is automatically adjusted according to the tension feedback of each roller, so that the roller speed is more stable and the occurrence of film breakage events is reduced.

[0018] Preferably, the sealing cover plate is connected to the supporting box body by bolts, and the sealing cover plate can be removed when repairing the internal structure such as the roller seal or replacing components.

[0019] Preferably, the small cover is mounted on the sealing cover by means of a hinge and a rotating handle. The small cover can be opened by rotating one side of the handle, and the sealing strength inside the supporting box can be adjusted according to the process requirements through the connecting strip on the small cover. When threading the film, the small cover is opened, and the traction rope is passed through each roller in turn. During production, the traction rope drives the membrane surface to thread the film. Therefore, the design of the small cover makes threading the film more convenient during the production process.

[0020] The beneficial effects of the present invention are as follows: a supporting box is provided at the drying room outlet, a sealing roller is provided at the side opening of the supporting box, and roller seals are provided on the upper and lower sides of the sealing roller. By adjusting the distance between the roller seal and the sealing roller, the size of the gap between the roller seal and the sealing roller is changed to adjust the sealing strength of the drying room outlet, reduce the leakage problem of the extractant at the drying room outlet, reduce the influence of the internal and external circulation of the drying room on the wind pressure at the drying room outlet, and improve the A-quality rate of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a roller sealing device for reducing the consumption of extractants in the production of lithium battery separators according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram without the roller seal and sealing roller;

[0023] Figure 3 This is a schematic diagram of the installation of the sealing roller and roller seal;

[0024] Figure 4 yes Figure 1 Side view of;

[0025] Figure 5 yes Figure 1 A top view of

[0026] Figure 6 yes Figure 1 A partial schematic diagram of the middle sealing top cover;

[0027] Figure 7 yes Figure 5 Stereoscopic images of small and medium cover plates;

[0028] Figure 8 It is a distribution diagram of the transmission rollers.

[0029] In the figure: 1-main frame, 2-roller sealing mechanism, 3-transmission mechanism, 101-sealing cover, 101-1 rotating handle, 101-2 hinge, 101-3 connecting strip, 102-support box, 103-support frame, 104-sealing roller support, 105 transmission roller support, 106-roller sealing support frame, 107-small cover, 201-bearing, 203-upper roller seal, 202-lower roller seal, 204-cylinder, 205-sealing roller, 206-upper support, 207-lower support, 208-first power mechanism, 301-first transmission roller, 302-second transmission roller, 303-third transmission roller, 304-servo motor, 305-reducer, 306-coupling, 307-bearing support device. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] As shown in the figure, a roller seal device for reducing extractant consumption in lithium battery separator production according to one embodiment of the present invention includes a support box 102 positioned outside the drying chamber outlet, with a support frame 103 connected to the bottom of the support box 102. One side of the support box 102 has an opening, within which a sealing roller 205 is mounted. One end of the sealing roller 205 is connected to a first power mechanism 208 that drives the sealing roller 205. Seals are located above and below the sealing roller 205, each with a gap between it and the sealing roller 205. The diaphragm passes over the sealing rollers 205 and between them and one of the seals. At least one seal is connected to an upper and lower adjustment mechanism for adjusting the gap between the seal and the roller. Bearings 201 are located at each end of the sealing roller 205.

[0032] In this embodiment, the roller seal includes an upper roller seal 203 and a lower roller seal 202. The upper roller seal 203 and the lower roller seal 202 are respectively connected to the support box 102 through an upper support 206 and a lower support 207. The lower support 207 is connected to the support box 102 through bolts. The upper support 206 is connected to the adjustment structure, and the adjustment mechanism is a cylinder 204.

[0033] The support housing 102 houses transmission rollers, which are equipped with a second power mechanism that drives them. The transmission rollers include a first transmission roller 301, a second transmission roller 302, and a third transmission roller 303. The sealing roller 205 is positioned above the first and third transmission rollers 301 and 303, respectively, below the second transmission roller 302. The first transmission roller 303 is positioned adjacent to the sealing roller 205. The diaphragm first passes under the third transmission roller 303, then over the second transmission roller 302, then under the first transmission roller 301, and finally out over the sealing roller 205. Both the transmission rollers and the sealing roller 205 are anodized aluminum. The roller seal is a double-layer structure, with an inner polytetrafluoroethylene sheet and an outer stainless steel shell.

[0034] A sealing cover plate 101 is provided on the top of the support box 102, and the sealing cover plate 101 is sealed and installed on the top of the support box 102. The sealing cover plate 101 is provided with a top opening, and a small cover plate 107 is provided at the top opening. One side of the small cover plate 107 is movably connected to the sealing cover plate 101 through a hinge 101-2, and the other side of the small cover plate 107 is connected to the sealing cover plate 101 through a rotating handle 101-1. In this embodiment, there are three small cover plates 107, and each small cover plate 107 is provided with a connecting strip 101-3 on one side of the hinge. The connecting strip is provided with a vertically extending long hole, and the long hole corresponds to the position of the bolt hole on the hinge. The connecting strip is fixed between the hinge and the side of the small cover plate 107.

[0035] like Figure 1 As shown, the main structure of the present invention mainly includes three parts: the main frame 1, the roll sealing mechanism 2 and the transmission mechanism 3. Figure 2As shown, the main frame mainly includes a sealing cover plate 101, a support box 102, and a support frame 103. The support box 102 is provided with a sealing roller support 104, a transmission roller support 105, and a roller sealing support frame 106. The three small covers 107 on the sealing cover 101 facilitate daily production operations and observation of the interior of the support box 102. The sealing cover 101 is bolted to the support box 102 to facilitate equipment repair and maintenance. Silicone gaskets are used at the joints to enhance sealing. The joints of the support box 102 are fully welded to ensure the sealing and connection strength of the box joints. The support box contains a transmission mechanism that cooperates with the sealing cover to seal the entire equipment. The support frame 103 is fixedly connected to the bottom of the support box 102 using bolts, mainly considering the ease of installation and transportation. The sealing roller support 104 and the transmission roller support 105 are connected to the support box using a bearing and bearing seat connection method. Bearings are fixed to the top of the shaft heads of the sealing roller and transmission roller, and the bearing seats are fixed to the support box via bolts. The bearings are driven by the servo motor. The bearing seats are fixed to the support box using bolts. A bearing shoe structure is provided on the sealing roller support 104 to increase the sealing performance of both ends of the sealing roller; the roller sealing support frame 106 is connected to the support box 102 with bolts, mainly serving to fix the cylinder 204, which is a variable stroke cylinder.

[0036] like Figure 5-7 As shown, one side of the small cover plate 107 is connected to the sealing cover plate 101 through a rotating handle 101-1, and the other side is connected to the sealing cover plate 101 through a hinge 101-2. A connecting strip 101-3 is set between the hinge and the sealing cover plate. Since a long hole extending up and down is provided on the connecting strip 101-3, the upper and lower positions of the small cover plate 101 can be adjusted by adjusting the relative positions of the small cover plate 101 and the connecting strip 101-3, and by locking the bolts on the hinge 101 at different positions of the long hole, the upper and lower positions of the small cover plate 101 can be adjusted, so that the sealing strength inside the support box 102 can be adjusted to meet the different sealing strength requirements of different types of membrane surfaces during the diaphragm production process.

[0037] like Figure 3-4As shown, the roll seal mechanism includes a roll seal 205, an upper roll seal 203, a lower roll seal 202, and bearings 201 positioned at each end of the roll seal 205. The roll seals are constructed from sheet-like polytetrafluoroethylene (PTFE) and a 304 stainless steel shell. The bearings 201 enhance the sealing performance of the roll seals. The upper and lower roll seals 203 and 202, respectively, are positioned above and below the roll seal 205, working together to provide a seal. The lower roll seal 202 is fixed and cannot be adjusted. The seal strength between the upper roll seal 203 and the roll seal 205 can be adjusted using a cylinder connected to the upper roll seal 203. The upper support 206 is bolted to the support housing 102 and primarily serves to secure the cylinder. The lower support 207 is bolted to the support housing 102 and supports the lower roll seal 202. A first power mechanism 208, comprising a servo motor, a reducer, and a coupling, is used to drive the roll seal 205.

[0038] like Figure 8 As shown, the transmission mechanism 3 includes a first transmission roller 301, a second transmission roller 302, and a third transmission roller 303. When the equipment is running, the film surface passes through these three transmission rollers, and the transmission rollers guide the film surface. Figure 8 The illustrated layout forms an air duct, further reducing the impact of circulating air pressure inside and outside the drying chamber on the roller sealing outlet. The second power mechanism for the drive rollers includes a servo motor 304, a reducer 305, a coupling 306, and a bearing support device 307. Both the drive rollers and the sealing rollers in this invention utilize anodized aluminum rollers. Compared to traditional steel rollers used in the diaphragm industry, anodized aluminum rollers are lightweight and corrosion-resistant, while also saving energy and reducing production costs. Each drive roller is controlled by a separate servo motor, providing additional tension and speed control. The speed of the drive rollers can be automatically adjusted based on tension, enhancing equipment operational stability.

[0039] This device can adjust the gap of the drying room outlet through sealing rollers, upper and lower roller seals, adjustable stroke cylinders and other mechanisms, effectively solving the problem of unorganized escape of the extractant in the drying room through the drying room outlet and reducing production costs.

[0040] The present invention forms a certain air duct when the film surface passes through each roller through the position distribution of the sealing roller and the driving roller (the air duct is M-shaped to block direct blowing), which greatly reduces the influence of the internal and external circulation of the drying room on the air pressure at the drying room outlet, thereby increasing the adjustable range of the internal and external circulation, increasing the process adjustable range, and thus improving the quality of the film surface.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A roller sealing device for reducing the consumption of extractants in the production of lithium battery separators, characterized by: The cam is secured to the upper and lower sides of the roll and is adapted to engage said sliding member and to engage said sliding member when said rolling member is engaged.

2. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 1, characterized in that: The roller seal includes an upper roller seal and a lower roller seal, which are respectively connected to the support box through an upper support and a lower support. The lower support is connected to the support box through bolts, and the upper support is connected to the adjustment structure, which is a cylinder.

3. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 2, characterized in that: The transmission roller and sealing roller are both made of aluminum rollers treated by anodizing process.

4. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 1, characterized in that: A sealing cover plate is provided on the top of the supporting box body, and the sealing cover plate is sealed and installed on the top of the supporting box body.

5. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 4, characterized in that: The sealing cover plate is provided with a top opening, and a small cover plate is provided at the top opening. One side of the small cover plate is movably connected to the sealing cover plate through a hinge, and the other side of the small cover plate is connected to the sealing cover plate through a rotating handle.

6. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 5, characterized in that: A connecting strip is provided on one side of the small cover plate where the hinge is provided. A vertically extending long hole is opened on the connecting strip. The long hole corresponds to the position of the bolt hole on the hinge. The connecting strip is fixed between the hinge and the side surface of the small cover plate.

7. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 1, characterized in that: The two ends of the sealing roller are respectively provided with bearing bushes; the bottom of the supporting box is connected with a supporting frame.

8. The roller sealing device for reducing the consumption of extractant in the production of lithium battery separators according to claim 1, characterized in that: The roller seal adopts an inner and outer double-layer structure, wherein the inner layer of the roller seal is a sheet-like polytetrafluoroethylene layer and the outer layer is a stainless steel shell.

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