A lithium battery film preheating and stretching device

Abstract

The present invention provides a lithium battery film preheating and stretching device, which relates to the field of lithium battery production. The lithium battery film preheating and stretching device includes a fixed base, a support leg fixedly connected to the top of the fixed base, and an end of the support leg away from the fixed base is connected to a drive device. The drive device is connected to a stretching buffer device, and the stretching buffer device is provided with a film drive buffer device, and the stretching buffer device is provided with a film magnetic buffer device. In the lithium battery film preheating and stretching device, the connecting shaft on the stretching buffer device is connected to the linear buffer spring inside the connecting ring through the film anti-fracture toggle plate, and the linear buffer spring is fixedly connected to the anti-fracture fixed plate inside the connecting ring. The linear buffer spring is provided to provide a buffering force for the transmission roller when the motor starts and drives the transmission roller to rotate, effectively solving the problem that the lithium battery film is unevenly thickened due to the instantaneous pulling of the lithium battery film during the instantaneous rotation of the motor.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery production, and in particular to a lithium battery film preheating and stretching device. Background Art

[0002] In the structure of lithium batteries, the separator is one of the key internal components. Because the electrolyte in lithium batteries is an organic solvent system, a separator material resistant to organic solvents is required. High-strength, thin-film polyolefin porous membranes are generally used.

[0003] Preheating and stretching is an important process in the manufacture of lithium battery diaphragms. After heating, the diaphragm is heated by a film preheating roller and stretched horizontally and longitudinally. The driving mode of the preheating and stretching device is generally motor-driven. When the motor starts to rotate, it often produces an instantaneous pulling force. The lithium battery film raw material on the film preheating roller often has a certain flexibility. When the motor starts instantly and drives the film preheating roller to rotate, the lithium battery film is subjected to uneven force, which will cause uneven thickness. Therefore, a lithium battery film preheating and stretching device is proposed to solve the above problems. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a lithium battery film preheating and stretching device, which solves the problem that the preheating and stretching device is generally driven by a motor, and the motor often generates an instantaneous pulling force when it starts to rotate. The lithium battery film raw material on the film preheating roller often has a certain flexibility. When the motor starts instantly and drives the film preheating roller to rotate, the lithium battery film is subjected to uneven force, resulting in uneven thickness.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a lithium battery film preheating and stretching device, comprising a fixed base, a support leg fixedly connected to the top of the fixed base, the support leg being connected to a driving device at one end away from the fixed base, a stretching buffer device being connected to the driving device, a film driving buffer device being provided on the stretching buffer device, and a film magnetic buffer device being provided on the stretching buffer device.

[0008] Preferably, the driving device includes a motor, a power shaft, a power box, an active bevel gear, a transmission bevel gear, an output shaft, a film preheating roller, a rotating shaft, a bearing 1 and a support seat, the end of the support leg away from the fixed base is fixedly connected to the motor, the output end of the motor is fixedly connected to the power shaft, the end of the power shaft away from the motor passes through the power box and extends to the interior of the power box, the active bevel gear is located inside the power box, the end of the power shaft away from the motor is fixedly connected to the active bevel gear, the toothed end of the active bevel gear is meshed with the transmission bevel gear, the inner ring of the transmission bevel gear is fixedly sleeved with the output shaft, the end of the output shaft away from the transmission gear passes through the power box and is fixedly connected to the film preheating roller arranged outside the power box, the end of the film preheating roller away from the output shaft is fixedly connected to the rotating shaft, the end of the rotating shaft away from the film preheating roller is movably plugged into the bearing 1, and the outer surface of the bearing 1 is welded and fixed to the support seat.

[0009] Preferably, the stretching buffer device includes a fixed frame, a second bearing, a buffer box, a connecting shaft, a connecting ring and a connecting disk. The outer surface of the support leg is located on the right side of the motor and is welded to the fixed frame. The inner wall of the fixed frame is welded to the buffer box on the side close to the film preheating roller. The connecting shaft is located inside the buffer box. One end of the connecting shaft passes through the buffer box and is fixedly connected to the second bearing arranged outside the buffer box. The inner wall of the fixed frame is welded to the outer ring of the second bearing. The other end of the connecting shaft is located inside the buffer box and is movably connected to the connecting ring. The interior of the connecting ring is hollow, and the side of the connecting ring away from the connecting shaft is fixedly connected to the connecting disk.

[0010] Preferably, the diaphragm driven buffer device includes a diaphragm anti-fracture toggle plate, a linear buffer spring and an anti-fracture fixing plate. The outer surface of the connecting shaft is fixedly connected to the diaphragm anti-fracture toggle plate. The linear buffer spring is arranged inside the connecting ring. One end of the linear buffer spring is fixedly connected to the diaphragm anti-fracture toggle plate. The anti-fracture fixing plate is fixedly connected inside the connecting ring. The other end of the linear buffer spring is fixedly connected to the anti-fracture fixing plate.

[0011] Preferably, the thin film magnetic buffer device includes a connecting groove, a permanent magnet block, a magnetizing pin, a connecting disk 2, a fixed shaft and a transmission roller shaft, the connecting groove is opened on the side of the connecting disk 1 away from the connecting shaft, the permanent magnet block is fixedly connected to the inner wall of the connecting groove, the magnetizing pin is located inside the connecting groove, the end of the magnetizing pin away from the connecting groove passes through the connecting groove and is fixedly connected to the connecting disk 2 arranged outside the connecting disk 1, the side of the connecting disk 2 away from the magnetizing pin is welded to the fixed shaft, and the end of the fixed shaft away from the connecting disk 2 passes through the buffer box and is fixedly connected to the transmission roller shaft arranged outside the buffer box.

[0012] Preferably, the magnetic poles of the magnetized pin and the permanent magnet block on the side close to each other are opposite.

[0013] (3) Beneficial effects

[0014] The present invention provides a lithium battery film preheating and stretching device. It has the following beneficial effects:

[0015] 1. The lithium battery film preheating stretching device is provided with a stretching buffer device. The connecting shaft on the stretching buffer device is connected to the linear buffer spring inside the connecting ring through the film anti-fracture toggle piece, and the linear buffer spring is fixedly connected to the anti-fracture fixing piece inside the connecting ring. The setting of the linear buffer spring can provide a buffering force for the transmission roller when the motor starts and drives the transmission roller to rotate, effectively solving the problem that the lithium battery film is unevenly thick due to the instantaneous pulling of the lithium battery film during the instantaneous rotation of the motor.

[0016] 2. The lithium battery film preheating and stretching device uses a permanent magnet block arranged inside the connecting groove and a magnetized pin arranged on the second connecting disk. The magnetized pin and the permanent magnet block have the same magnetic poles and are located inside the connecting groove. The magnetized pin and the permanent magnet block have the same magnetic poles and repel each other when they are close to each other. This can provide uniform force for the transmission roller at the moment the motor starts to drive the transmission roller to rotate, and can evenly pull the lithium battery film on the transmission roller to reduce material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention;

[0019] Figure 3 This is a cross-sectional view of the power box structure of the present invention;

[0020] Figure 4 This is a cross-sectional view of the buffer box structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the structural connection between the tensile buffer device and the thin film magnetic buffer device of the present invention;

[0022] Figure 6 This is a structural diagram of a connecting disk according to the present invention;

[0023] Figure 7 It is a schematic diagram of the connecting ring structure of the present invention.

[0024] Among them, 1 fixed base, 2 support legs, 3 drive device, 301 motor, 302 power shaft, 303 power box, 304 active bevel gear, 305 transmission bevel gear, 306 output shaft, 307 film preheating roller, 308 rotating shaft, 309 bearing 1, 310 support seat, 4 stretching buffer device, 401 fixed frame, 402 bearing 2, 403 buffer box, 404 connecting shaft, 405 connecting ring, 406 connecting disk 1, 5 film drive buffer device, 501 film anti-fracture toggle plate, 502 linear buffer spring, 503 film anti-fracture fixed plate, 6 film magnetic buffer device, 601 connecting slot, 602 permanent magnet block, 603 magnetized nail, 604 connecting disk 2, 605 fixed shaft, 606 transmission roller shaft. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and examples.

[0026] The embodiment of the present invention provides a lithium battery film preheating stretching device, such as Figure 1-7 As shown, it includes a fixed base 1, the top of the fixed base 1 is fixedly connected to a support leg 2, the end of the support leg 2 away from the fixed base 1 is connected to a driving device 3, the driving device 3 is connected to a stretching buffer device 4, the stretching buffer device 4 is provided with a thin film drive buffer device 5, and the stretching buffer device 4 is provided with a thin film magnetic buffer device 6.

[0027] The driving device 3 includes a motor 301, a power shaft 302, a power box 303, an active bevel gear 304, a transmission bevel gear 305, an output shaft 306, a film preheating roller 307, a rotating shaft 308, a bearing 1 309 and a support base 310. The end of the support leg 2 away from the fixed base 1 is fixedly connected to the motor 301, the output end of the motor 301 is fixedly connected to the power shaft 302, the end of the power shaft 302 away from the motor 301 passes through the power box 303 and extends to the inside of the power box 303, the active bevel gear 304 is located inside the power box 303, the end of the power shaft 302 away from the motor 301 is fixedly connected to the active bevel gear 304, the tooth pattern end of the active bevel gear 304 is connected to the transmission bevel gear 305 The inner ring of the transmission bevel gear 305 is fixedly sleeved with the output shaft 306, and the end of the output shaft 306 away from the transmission gear 305 passes through the power box 303 and is fixedly connected to the film preheating roller 307 arranged outside the power box 303. The end of the film preheating roller 307 away from the output shaft 306 is fixedly connected to the rotating shaft 308, and the end of the rotating shaft 308 away from the film preheating roller 307 is movably connected to the bearing 1 309. The outer surface of the bearing 1 309 is welded and fixed to the support seat 310, and is connected to the active bevel gear 304 and the transmission bevel gear 305 through the output shaft of the motor 301. When the motor 301 rotates, it can drive the output shaft 306 and the film preheating roller 307 connected to the transmission bevel gear 305 to rotate.

[0028] The stretching buffer device 4 includes a fixed frame 401, a second bearing 402, a buffer box 403, a connecting shaft 404, a connecting ring 405 and a connecting disk 1 406. The outer surface of the support leg 2 is located on the right side of the motor 301 and is welded to the fixed frame 401. The inner wall of the fixed frame 401 is welded to the buffer box 403 on the side close to the film preheating roller 307. The connecting shaft 404 is located inside the buffer box 403. One end of the connecting shaft 404 passes through the buffer box 403 and is fixedly connected to the second bearing 402 arranged outside the buffer box 403. The inner wall of the fixed frame 401 is welded to the outer ring of the second bearing 402. The other end of the connecting shaft 404 is located inside the buffer box 403 and is movably connected to the connecting ring 405. The interior of the connecting ring 405 is hollow, and the side of the connecting ring 405 away from the connecting shaft 404 is fixedly connected to the connecting disk 1 406.

[0029] The film drive buffer device 5 includes a film anti-fracture toggle piece 501, a linear buffer spring 502 and an anti-fracture fixing piece 503. The outer surface of the connecting shaft 404 is fixedly connected to the film anti-fracture toggle piece 501. The linear buffer spring 502 is arranged inside the connecting ring 405. One end of the linear buffer spring 502 is fixedly connected to the film anti-fracture toggle piece 501. The anti-fracture fixing piece 503 is fixedly connected to the inside of the connecting ring 405. The other end of the linear buffer spring 502 is fixedly connected to the anti-fracture fixing piece 503. Lithium battery film generally uses polyolefin as a material. Thermoplastic polyolefin is an elastomeric material composed of two components, rubber and polyolefin. It is an elastomeric material with both rubber and thermoplastic properties. The polymer material shows high elasticity of rubber at room temperature and can be plasticized and formed at high temperature. Through the stretching buffer device 4 set on the equipment, the connecting shaft 404 on the stretching buffer device 4 is connected to the linear buffer spring 502 inside the connecting ring 405 through the film anti-fracture toggle piece 501, and the linear buffer spring 502 is fixedly connected to the anti-fracture fixing piece 503 inside the connecting ring 405. The setting of the linear buffer spring 502 can provide a buffering force for the transmission roller 606 when the motor 301 starts and drives the transmission roller 606 to rotate, effectively solving the problem that the motor 301 drives the lithium battery film to be pulled instantly during the instantaneous rotation, which may cause uneven thickness of the lithium battery film.

[0030] The thin film magnetic buffer device 6 includes a connecting groove 601, a permanent magnet block 602, a magnetizing pin 603, a connecting disk 2 604, a fixed shaft 605 and a transmission roller 606. The connecting groove 601 is opened on the side of the connecting disk 1 406 away from the connecting shaft 404. The permanent magnet block 602 is fixedly connected to the inner wall of the connecting groove 601. The magnetizing pin 603 is located inside the connecting groove 601. The magnetic poles of the magnetizing pin 603 and the permanent magnet block 602 on the side close to each other are opposite. The end of the magnetizing pin 603 away from the connecting groove 601 passes through the connecting groove 601 and is fixedly connected to the connecting disk 2 604 arranged outside the connecting disk 1 406. The side of the connecting disk 2 604 away from the magnetizing pin 603 is welded and fixed to the fixed shaft 605. The end of the fixed shaft 605 away from the connecting disk 2 604 passes through the buffer box 403 and is connected to the transmission roller 6 arranged outside the buffer box 403. 06 is fixedly connected, and the preheated lithium battery film is overlapped on the film preheating roller 307 and the transmission roller 606 respectively. The lithium battery film overlapped on the film preheating roller 307 and the transmission roller 606 can be stretched by the rotation of the motor 301. The permanent magnet block 602 is arranged inside the connecting groove 601 and the magnetized pin 603 is arranged on the connecting disk 2 604. The magnetic poles between the magnetized pin 603 and the permanent magnet block 602 are the same and the magnetized pin 603 is located inside the connecting groove 601. The magnetized pin 603 and the permanent magnet block 602 have the same magnetic poles and the magnetized pin 603 and the permanent magnet block 602 repel each other when they are close to each other. At the moment when the motor 301 starts to drive the transmission roller 606 to rotate, a uniform force can be provided to the transmission roller 606, so that the lithium battery film on the transmission roller 606 can be evenly pulled to reduce material waste.

[0031] Working principle: When in use, the output shaft of the motor 301 is connected to the active bevel gear 304 and the transmission bevel gear 305. When the motor 301 rotates, the output shaft 306 connected to the transmission bevel gear 305 and the film preheating roller 307 can be driven to rotate. The preheated lithium battery film is overlapped on the film preheating roller 307 and the transmission roller shaft 606 respectively. The rotation of the motor 301 can stretch the lithium battery film overlapped on the film preheating roller 307 and the transmission roller shaft 606. Through the stretching buffer device 4 provided on the device, the connecting shaft 404 on the stretching buffer device 4 is connected to the linear buffer spring 502 inside the connecting ring 405 through the film anti-fracture toggle piece 501, and the linear buffer spring 502 is connected to the anti-fracture toggle piece 501 inside the connecting ring 405. The fixing plate 503 is fixedly connected, and the setting of the linear buffer spring 502 can provide a buffering force for the transmission roller 606 when the motor 301 starts and drives the transmission roller 606 to rotate. Through the permanent magnet block 602 set inside the connecting groove 601 and the magnetized pin 603 set on the connecting disk 2 604, the magnetic poles between the magnetized pin 603 and the permanent magnet block 602 are the same and the magnetized pin 603 is located inside the connecting groove 601. The magnetized pin 603 and the permanent magnet block 602 have the same magnetic poles and the magnetized pin 603 and the permanent magnet block 602 repel each other when they approach each other. At the moment when the motor 301 starts and drives the transmission roller 606 to rotate, a uniform force can be provided to the transmission roller 606, thereby reducing the occurrence of uneven thickness of the film at startup.

[0032] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery film preheating and stretching device, comprising a fixed base (1), characterized in that: The top of the fixed base (1) is fixedly connected to a support leg (2), one end of the support leg (2) away from the fixed base (1) is connected to a driving device (3), the driving device (3) is connected to a stretching buffer device (4), the stretching buffer device (4) is provided with a film drive buffer device (5), and the stretching buffer device (4) is provided with a film magnetic buffer device (6); the stretching buffer device (4) comprises a fixed frame (401), a second bearing (402), a buffer box (403), a connecting The support leg (2) is provided with a shaft (404), a connecting ring (405) and a connecting plate (406), the outer surface of the support leg (2) is located on the right side of the motor (301) and is welded to the fixed frame (401), the inner wall of the fixed frame (401) is close to the side of the film preheating roller (307) and is welded to the buffer box (403), the connecting shaft (404) is located inside the buffer box (403), one end of the connecting shaft (404) passes through the buffer box (403) and is connected to the bearing provided outside the buffer box (403). The second (402) is fixedly sleeved, the inner wall of the fixed frame (401) is welded and fixed to the outer ring of the second bearing (402), the other end of the connecting shaft (404) is located inside the buffer box (403) and is movably sleeved with the connecting ring (405), the interior of the connecting ring (405) is hollow, and the side of the connecting ring (405) away from the connecting shaft (404) is fixedly connected to the connecting disk one (406); the film drive buffer device (5) includes a film anti-fracture toggle plate (501), a linear buffer spring (5 02) and an anti-fracture fixing piece (503), the outer surface of the connecting shaft (404) is fixedly connected to the film anti-fracture toggle piece (501), the linear buffer spring (502) is arranged inside the connecting ring (405), one end of the linear buffer spring (502) is fixedly connected to the film anti-fracture toggle piece (501), the anti-fracture fixing piece (503) is fixedly connected to the inside of the connecting ring (405), and the other end of the linear buffer spring (502) is fixedly connected to the anti-fracture fixing piece (503).

2. The lithium battery film preheating and stretching device according to claim 1, characterized in that: The driving device (3) comprises a motor (301), a power shaft (302), a power box (303), an active bevel gear (304), a transmission bevel gear (305), an output shaft (306), a film preheating roller (307), a rotating shaft (308), a bearing 1 (309) and a support base (310), wherein the end of the support leg (2) away from the fixed base (1) is fixedly connected to the motor (301), the output end of the motor (301) is fixedly connected to the power shaft (302), the end of the power shaft (302) away from the motor (301) passes through the power box (303) and extends to the interior of the power box (303), the active bevel gear (304) is located inside the power box (303), and the power shaft (302) away from the motor (301) is fixedly connected to the power box (303). One end of the machine (301) is fixedly connected to the active bevel gear (304), the tooth pattern end of the active bevel gear (304) is meshed with the transmission bevel gear (305), the inner ring of the transmission bevel gear (305) is fixedly sleeved with the output shaft (306), the end of the output shaft (306) away from the transmission bevel gear (305) passes through the power box (303) and is fixedly connected to the film preheating roller (307) arranged outside the power box (303), the end of the film preheating roller (307) away from the output shaft (306) is fixedly connected to the rotating shaft (308), the end of the rotating shaft (308) away from the film preheating roller (307) is movably plugged into a bearing one (309), and the outer surface of the bearing one (309) is welded and fixed to the support seat (310).

3. The lithium battery film preheating and stretching device according to claim 2, characterized in that: The thin film magnetic buffer device (6) includes a connecting groove (601), a permanent magnet block (602), a magnetizing pin (603), a connecting disk 2 (604), a fixed shaft (605) and a transmission roller shaft (606), wherein the connecting groove (601) is provided on a side of the connecting disk 1 (406) away from the connecting shaft (404), the permanent magnet block (602) is fixedly connected to the inner wall of the connecting groove (601), the magnetizing pin (603) is located inside the connecting groove (601), and the One end of the magnetized nail (603) away from the connection slot (601) passes through the connection slot (601) and is fixedly connected to a second connection disc (604) provided outside the first connection disc (406); one side of the second connection disc (604) away from the magnetized nail (603) is welded and fixed to a fixed shaft (605); one end of the fixed shaft (605) away from the second connection disc (604) passes through the buffer box (403) and is fixedly connected to a transmission roller shaft (606) provided outside the buffer box (403).

4. The lithium battery film preheating and stretching device according to claim 3, characterized in that: The magnetic poles of the magnetized pin (603) and the permanent magnet block (602) that are close to each other are opposite.

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