Extension device of lithium battery diaphragm

Abstract

The invention relates to the technical field of battery production, and discloses a lithium battery diaphragm extension device which comprises a base and an air cylinder, a motor is fixedly connected to the inner wall of the base, a support is fixedly connected to the top of the base, a stretching mechanism is arranged at the top of the base, a preheating mechanism is arranged at the top of the base, and a coating mechanism is arranged at the top of the base. According to the invention, the fixed end cannot move, so that the dimensional stability and structural integrity of the diaphragm in the production process and the safety of the final battery are ensured, the consistent thickness of the diaphragm in the extension process can be ensured, a plurality of diaphragms can be stretched on different reels, and the production efficiency is improved. And by accurately controlling the speed and tension of each reel, the stress in the stretching process is ensured to be more uniformly distributed, so that the quality of the diaphragm is improved, finer quality control can be realized, the quality of each diaphragm is ensured to meet the standard, and waste products caused by non-uniform stretching or material defects are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and particularly to a stretching device for a lithium battery separator. Background Art

[0002] The stretching device for a lithium battery separator (also known as the stretching device for a lithium battery separator) is one of the key devices in the production process of lithium batteries, mainly used for manufacturing high-performance lithium battery separators. The lithium battery separator is an important component in a lithium battery, which plays a role in isolating the positive and negative electrodes, conducting ions, and maintaining the stability and safety of the battery. The stretching device of the separator plays an important role in its manufacturing process to ensure that the thickness uniformity, porosity, mechanical properties, etc. of the separator reach ideal standards.

[0003] The patent with the publication number CN221067173U discloses a stretching device for a lithium battery separator, including a bracket and a winding structure. The bracket is placed in front of the winding structure. On the upper surface of the bracket, a rotary structure is respectively arranged on the left and right sides. There is an included angle between the left and right rotary structures. The distance between the two rotary structures near the winding structure is larger. A plurality of clamping mechanisms are connected to the outside of the rotary structure. A state-changing member for changing the state of the clamping mechanism is arranged at the position where the rotary structure is arranged on the bracket, which has the advantage of realizing uniform stretching of the separator.

[0004] When the above device is in use, it is difficult to fully fix the lithium battery separator, and thus the fixed end is prone to shift during the stretching of the lithium battery separator, affecting the subsequent stretching effect of the lithium battery. Therefore, a stretching device for a lithium battery separator is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a stretching device for a lithium battery separator aiming at the deficiencies in the above-mentioned prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a stretching device for a lithium battery separator, comprising a base and a cylinder. The inner wall of the base is fixedly connected with a motor, the top of the base is fixedly connected with a bracket, a stretching mechanism is arranged on the top of the base, a preheating mechanism is arranged on the top of the base, and a coating mechanism is arranged on the top of the base. The stretching mechanism includes a chassis, a stabilizing plate, a pressure column, a connecting plate, a connecting column I, an extrusion plate, a rotating column I, a winding shaft I, a pulley group, a rotating column II, a winding shaft II, a disc, a cylindrical block, a stabilizing seat, and a pressure-receiving plate. The chassis is fixedly connected to the top of the base, the stabilizing plate is fixedly connected to the top of the chassis, the cylinder is fixedly connected to the top of the stabilizing plate, the pressure column is fixedly connected to the output end of the cylinder, the connecting plate is fixedly connected to the bottom of the pressure column, the connecting column I is fixedly connected to the bottom of the connecting plate, the extrusion plate is fixedly connected to the bottom of the connecting column I, the pressure-receiving plate is fixedly connected to the inner wall of the chassis, the rotating column I is fixedly connected to the output end of the motor, the winding shaft I is fixedly connected to the circumferential surface of the rotating column I, the pulley group is fixedly connected to the circumferential surface of the rotating column I, the stabilizing seat is fixedly connected to the top of the base, the rotating column II is rotatably connected to the inner wall of the stabilizing seat, the winding shaft II is fixedly connected to the circumferential surface of the rotating column II, the disc is fixedly connected to the circumferential surface of the rotating column II, the cylindrical block is fixedly connected to the front of the disc, the rotating column I is rotatably connected to the inner wall of the bracket, the circumferential surface of the rotating column II is fixedly connected to the pulley on the left side of the pulley group, the connecting plate is in contact with the stabilizing plate, ensuring the dimensional stability, structural integrity, and the safety of the final battery during the production process of the separator, and can ensure that it maintains a consistent thickness during the stretching process. Multiple separators can be stretched on different winding shafts, and by precisely controlling the speed and tension of each winding shaft, the stress during the stretching process can be more evenly distributed, thereby improving the quality of the separator. Through the operation of multiple winding shafts, more precise quality control can be achieved, ensuring that the quality of each separator meets the standards and reducing waste caused by uneven stretching or material defects.

[0007] Preferably, the preheating mechanism includes a connecting rod, a sliding box, a fan assembly, and a heating assembly. The connecting rod is rotatably connected to the surface of the cylindrical block, the sliding box is rotatably connected to the inner wall of the connecting rod, the fan assembly is fixedly installed on the inner wall of the sliding box, and the heating assembly is fixedly installed on the inner wall of the sliding box. The preheating mechanism further includes a fixing block, a hinge column, a wind guiding plate, and a first pushing triangular plate. The fixing block is fixedly connected to the top of the sliding box, the hinge column is connected to the inner wall of the fixing block through a torsion spring, the wind guiding plate is fixedly connected to the circumferential surface of the hinge column, and the first pushing triangular plate is fixedly connected to the inner wall of the sliding box. The sliding box is slidably connected to the inner wall of the base. The number of the fan assembly and the heating assembly is set to be multiple, and multiple fan assemblies and heating assemblies are linearly arrayed on the inner wall of the sliding box, so that the heat generated inside is blown onto the surface of the lithium battery separator at the top, and a certain preheating effect is achieved for the lithium battery separator that needs to be extended. Through preheating, the molecular chains of the material can be activated, thereby improving its plasticity and ductility. The preheated separator can be stretched more evenly during the stretching process, avoiding uneven stretching and defects, ensuring the consistency of performance parameters such as the thickness and porosity of the separator, improving the plasticity and ductility of the material, optimizing the microscopic pore structure, increasing production efficiency, reducing stress, enhancing thermal stability, thereby ensuring the normal function of the separator in the lithium battery and the stability of long-term use. It can achieve a multi-angle preheating effect, ensure that the preheating area is more uniform during the stretching of the lithium battery separator, guarantee the stretching effect of the lithium battery, reduce the damage of the lithium battery separator stretching caused by uneven heat transfer, reduce production costs, and improve the working efficiency of the device.

[0008] Preferably, the coating mechanism includes a vertical plate, a blocking block, a second pushing triangular plate, an upper storage cylinder, a first brush column, a second brush column, a pushing block, and a semi-circular arc plate. The vertical plate is fixedly connected to the top of the base. The blocking block is fixedly connected to the right side of the vertical plate. The second pushing triangular plate is slidably connected to the inner wall of the vertical plate. The upper storage cylinder is fixedly connected to the inner wall of the vertical plate. The first brush column is fixedly connected to the inner wall of the vertical plate. The second brush column is fixedly connected to the inner wall of the vertical plate. The pushing block is slidably connected to the inner wall of the vertical plate. The semi-circular arc plate is fixedly connected to the inner wall of the pushing block. The coating mechanism further includes a lower storage cylinder, a connecting block, and a sponge block. The lower storage cylinder is fixedly connected to the inner wall of the vertical plate. The connecting block is fixedly connected to the inner wall of the second pushing triangular plate. The sponge block is fixedly connected to the inner wall of the connecting block. The semi-circular arc plate is slidably connected to the inner wall of the upper storage cylinder. The connecting block is slidably connected to the inner wall of the vertical plate, so that the solvent-based coating is evenly applied to the upper surface of the lithium battery separator, making the subsequent stretching and preheating effect better. Coating the solvent-based coating on the surface of the lithium battery can form a thin film on the surface of the separator, enhancing the mechanical strength and tensile resistance of the separator, and avoiding rupture or pore expansion during subsequent production or battery use. It enables the solvent-based coating to be evenly applied to the surface of the lithium battery, maintaining the uniform coating of the solvent-based coating, which can ensure the performance, stability, and safety of the battery, and making the lithium battery stretching effect of the device better.

[0009] The present invention adopts the above technical solutions and can bring the following beneficial effects: 1. For the lithium battery separator stretching device, through the mutual cooperation and movement among the chassis, the stabilizing plate, the pressure column, the connecting plate, the first connecting column, the extrusion plate, the first rotating column, the first winding shaft, the pulley group, the second rotating column, the second winding shaft, the disc, the cylindrical block, the stabilizing seat, and the pressure-receiving plate, the fixed end cannot move, ensuring the dimensional stability, structural integrity during the production of the separator, and the safety of the final battery. It can ensure that the thickness remains consistent during the stretching process. Multiple separators can be stretched on different winding shafts, and by precisely controlling the speed and tension of each winding shaft, the stress during the stretching process can be more evenly distributed, thereby improving the quality of the separator. Through multiple winding shaft operations, more refined quality control can be achieved, ensuring that the quality of each separator meets the standards and reducing waste products caused by uneven stretching or material defects.

[0010] 2. The lithium battery separator stretching device, through the mutual cooperation of the connecting rod, sliding box, fan assembly, heating assembly, fixed block, hinge column, air guide plate, and the first pushing triangular plate, blows the heat generated inside to the surface of the lithium battery separator at the top, preheating the lithium battery separator that needs to be stretched to a certain extent. Through preheating, the molecular chains of the material can be activated, thereby improving its plasticity and ductility. The preheated separator can be stretched more evenly during the stretching process, avoiding uneven stretching and defects, ensuring the consistency of performance parameters such as the thickness and porosity of the separator, improving the plasticity and ductility of the material, optimizing the microscopic pore structure, improving production efficiency, reducing stress, enhancing thermal stability, thereby ensuring the normal function of the separator in the lithium battery and the stability during long-term use. It can achieve a multi-angle preheating effect, ensure that during the stretching of the lithium battery separator, the preheating area is more uniform, guarantee the stretching effect of the lithium battery, reduce the damage of the lithium battery separator stretching caused by uneven heat transfer, reduce production costs, and improve the working efficiency of the device.

[0011] 3. The lithium battery separator stretching device, through the mutual cooperation of the vertical plate, abutting block, the second pushing triangular plate, upper storage cylinder, brush column 1, brush column 2, pushing block, semi-circular plate, lower storage cylinder, connecting block, and sponge block, evenly applies its solvent-based coating on the upper surface of the lithium battery separator, making the subsequent stretching and preheating effect better. Coating the solvent-based coating on the lithium battery surface can form a thin film on the separator surface, enhancing the mechanical strength and tensile resistance of the separator, avoiding rupture or pore expansion during subsequent production or battery use, enabling the solvent-based coating to be evenly applied on the surface of the lithium battery, maintaining the uniform coating of the solvent-based coating, ensuring the performance, stability, and safety of the battery, and making the lithium battery stretching effect of the device better. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the stretching mechanism of the present invention; Figure 3 is a schematic diagram of the chassis structure of the present invention; Figure 4 is a schematic diagram of the preheating mechanism of the present invention; Figure 5 is of the present invention Figure 4 enlarged view of the structure at A in; Figure 6 is a schematic diagram of the coating mechanism of the present invention; Figure 7 is a schematic diagram of the connecting block structure of the present invention; Figure 8 is of the present invention Figure 6 enlarged view of the structure at B in.

[0013] In the figure: 1, base; 2, cylinder; 3, motor; 4, bracket; 5, stretching mechanism; 6, preheating mechanism; 7, coating mechanism; 501, chassis; 502, stabilizing plate; 503, pressure column; 504, connecting plate; 505, connecting column 1; 506, extrusion plate; 507, rotating column 1; 508, reel 1; 509, pulley set; 510, rotating column 2; 511, reel 2; 512, disc; 513, cylindrical block; 514, stabilizing seat; 515, pressure-receiving plate; 601, connecting rod; 602, sliding box; 603, fan assembly; 604, heating assembly; 605, fixing block; 606, hinged column; 607, air guide plate; 608, pushing triangular plate 1; 701, vertical plate; 702, abutting block; 703, pushing triangular plate 2; 704, upper storage cylinder; 705, lower storage cylinder; 706, brush column 1; 707, brush column 2; 708, connecting block; 709, sponge block; 710, pushing block; 711, semi-circular plate. Specific implementation manners

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1-8, an embodiment of the present invention is: a stretching device for a lithium battery separator, including a base 1 and a cylinder 2. The inner wall of the base 1 is fixedly connected with a motor 3, the top of the base 1 is fixedly connected with a bracket 4, the top of the base 1 is provided with a stretching mechanism 5, the top of the base 1 is provided with a preheating mechanism 6, and the top of the base 1 is provided with a coating mechanism 7. The stretching mechanism 5 includes a chassis 501, a stabilizing plate 502, a pressure column 503, a connecting plate 504, a connecting column 505, a pressing plate 506, a rotating column 507, a reel 508, a pulley group 509, a rotating column 510, a reel 511, a disc 512, a cylindrical block 513, a stabilizing seat 514, and a pressure receiving plate 515. The chassis 501 is fixedly connected to the top of the base 1, the stabilizing plate 502 is fixedly connected to the top of the chassis 501, the cylinder 2 is fixedly connected to the top of the stabilizing plate 502, the pressure column 503 is fixedly connected to the output end of the cylinder 2, the connecting plate 504 is fixedly connected to the bottom of the pressure column 503, the connecting column 505 is fixedly connected to the bottom of the connecting plate 504, and the pressing plate 506 is fixedly connected to the bottom of the connecting column 505. When the device is started, one end of multiple lithium battery separators is placed on the top of the pressure receiving plate 515. At this time, the cylinder 2 is started, and the output end of the cylinder 2 drives the pressure column 503 to move. The pressure column 503 drives the connecting plate 504 to move. The movement of the connecting plate 504 will drive multiple connecting columns 505 to move. The movement of multiple connecting columns 505 will drive multiple pressing plates 506 to move. At this time, the pressing plate 506 will press down the lithium battery separator on the top of the pressure receiving plate 515, so that multiple lithium battery separators cannot move during subsequent stretching, ensuring that one fixed end cannot move during the stretching of the lithium battery separator, ensuring the dimensional stability, structural integrity during the production process of the separator, and the safety of the final battery. It can ensure that it maintains a consistent thickness during the stretching process. The pressure receiving plate 515 is fixedly connected to the inner wall of the chassis 501. The rotating column 507 is fixedly connected to the output end of the motor 3. The reel 508 is fixedly connected to the circumferential surface of the rotating column 507. The pulley group 509 is fixedly connected to the circumferential surface of the rotating column 507. The stabilizing seat 514 is fixedly connected to the top of the base 1. The rotating column 510 is rotatably connected to the inner wall of the stabilizing seat 514. The reel 511 is fixedly connected to the circumferential surface of the rotating column 510. The disc 512 is fixedly connected to the circumferential surface of the rotating column 510. The cylindrical block 513 is fixedly connected to the front of the disc 512. The rotating column 507 is rotatably connected to the inner wall of the bracket 4. The circumferential surface of the rotating column 510 is fixedly connected to the pulley on the left side of the pulley group 509. The connecting plate 504 is in contact with the stabilizing plate 502. At the same time, first pass the other end of the lithium battery separator over the top of the reel 511 and then fix the lithium battery separator on the circumferential surface of the reel 508. At this time, the motor 3 will be started, and the output end of the motor 3 will drive the rotating column 507 to rotate. The rotation of the rotating column 507 will drive the reel 508 to rotate. When the rotating column 507 rotates, it will drive the pulley group 509 to rotate.The pulley set 509 drives the rotation of the second rotating column 510. The rotation of the second rotating column 510 drives the rotation of the second reel 511. The rotation of the second rotating column 510 drives the rotation of the disc 512. The rotation of the disc 512 drives the rotation of the cylindrical block 513. Multiple diaphragms can be stretched on different reels. By precisely controlling the speed and tension of each reel, it is ensured that the stress during the stretching process is more evenly distributed, thereby improving the quality of the diaphragms. Through the operation of multiple reels, more refined quality control can be achieved, ensuring that the quality of each diaphragm meets the standards and reducing waste caused by uneven stretching or material defects; The preheating mechanism 6 includes a connecting rod 601, a sliding box 602, a fan assembly 603, and a heating assembly 604. The connecting rod 601 is rotatably connected to the surface of the cylindrical block 513, the sliding box 602 is rotatably connected to the inner wall of the connecting rod 601, the fan assembly 603 is fixedly installed on the inner wall of the sliding box 602, and the heating assembly 604 is fixedly installed on the inner wall of the sliding box 602. When the device is started, the rotation of the cylindrical block 513 drives the movement of the connecting rod 601, the movement of the connecting rod 601 drives the movement of the sliding box 602, and the movement of the sliding box 602 drives the movement of the fan assembly 603 and the heating assembly 604. During the rotation of the cylindrical block 513, the sliding box 602 is driven to reciprocate horizontally by the connecting rod 601. At this time, the fan assembly 603 inside the sliding box 602 blows the heat generated by the heating assembly 604 onto the surface of the lithium battery diaphragm at the top, achieving a certain preheating effect on the lithium battery diaphragm that needs to be extended. Through preheating, the molecular chains of the material can be activated, thereby improving its plasticity and ductility. The preheated diaphragm can be stretched more evenly during the extension process, avoiding uneven stretching and defects, ensuring the consistency of performance parameters such as the thickness and porosity of the diaphragm, improving the plasticity and ductility of the material, optimizing the micro-porous structure, increasing production efficiency, reducing stress, enhancing thermal stability, and thus ensuring the normal function of the diaphragm in the lithium battery and the stability during long-term use. The preheating mechanism 6 further includes a fixing block 605, a hinged column 606, a wind guide plate 607, and a first pushing triangular plate 608. The fixing block 605 is fixedly connected to the top of the sliding box 602, the hinged column 606 is connected to the inner wall of the fixing block 605 through a torsion spring, the wind guide plate 607 is fixedly connected to the circumferential surface of the hinged column 606, and the first pushing triangular plate 608 is fixedly connected to the inner wall of the sliding box 602. The sliding box 602 is slidably connected to the inner wall of the base 1. The number of the fan assembly 603 and the heating assembly 604 is set to be multiple, and multiple fan assemblies 603 and heating assemblies 604 are linearly arranged on the inner wall of the sliding box 602. At the same time, during the reciprocating movement of the sliding box 602, the abutting block 702 contacts the wind guide plate 607. At this time, the abutting block 702 squeezes the wind guide plate 607, causing the wind guide plate 607 to deflect at an angle. At this time, the wind guide plate 607 with the adjusted angle can change the direction of the hot air, playing a certain guiding role for the hot air, and achieving a multi-angle preheating effect, ensuring that during the extension of the lithium battery diaphragm, the preheating area is more uniform, guaranteeing the extension effect of the lithium battery, reducing the damage to the lithium battery diaphragm extension caused by uneven heat transfer, reducing production costs, and improving the working efficiency of the device.

[0016] Working principle: When the device is started, one end of multiple lithium battery diaphragms is placed on the top of the pressure receiving plate 515. At this time, the air cylinder 2 is started, and the output end of the air cylinder 2 drives the pressure column 503 to move. The pressure column 503 drives the connecting plate 504 to move. The movement of the connecting plate 504 drives the movement of multiple first connecting columns 505. The movement of multiple first connecting columns 505 drives the movement of multiple pressing plates 506. At this time, the pressing plates 506 press down the lithium battery diaphragms on the top of the pressure receiving plate 515, so that the multiple lithium battery diaphragms cannot move during subsequent stretching, ensuring that the fixed end cannot move during the stretching of the lithium battery diaphragms, ensuring the dimensional stability, structural integrity during the production of the diaphragms and the safety of the final battery, ensuring that it maintains a consistent thickness during the stretching process. At the same time, first pass the other end of the lithium battery diaphragm over the top of the second reel 511, and then fix the lithium battery diaphragm on the circumferential surface of the first reel 508. At this time, the motor 3 is started, and the output end of the motor 3 drives the first rotating column 507 to rotate. The rotation of the first rotating column 507 drives the first reel 508 to rotate. While the first rotating column 507 rotates, it drives the pulley group 509 to rotate. The pulley group 509 drives the second rotating column 510 to rotate. The rotation of the second rotating column 510 drives the second reel 511 to rotate. The rotation of the second rotating column 510 drives the disc 512 to rotate. The rotation of the disc 512 drives the cylindrical block 513 to rotate. Multiple diaphragms can be stretched on different reels, and by precisely controlling the speed and tension of each reel, ensure that the stress during the stretching process is more evenly distributed, thereby improving the quality of the diaphragm. Through the operation of multiple reels, more refined quality control can be achieved, ensuring that the quality of each diaphragm meets the standards and reducing waste caused by uneven stretching or material defects.

[0017] When the device is started, the rotation of the cylindrical block 513 drives the connecting rod 601 to move. The movement of the connecting rod 601 drives the sliding box 602 to move. The movement of the sliding box 602 drives the fan assembly 603 and the heating assembly 604 to move. During the rotation of the cylindrical block 513, the sliding box 602 is driven by the connecting rod 601 to reciprocate horizontally. At this time, the fan assembly 603 inside the sliding box 602 blows the heat generated by the heating assembly 604 onto the surface of the lithium battery separator at the top, achieving a certain preheating effect on the lithium battery separator that needs to be extended. Through preheating, the molecular chains of the material can be activated, thereby improving its plasticity and ductility. The preheated separator can be stretched more evenly during the extension process, avoiding uneven stretching and defects, ensuring the consistency of performance parameters such as the thickness and porosity of the separator, improving the plasticity and ductility of the material, optimizing the microscopic pore structure, increasing production efficiency, reducing stress, enhancing thermal stability, and thus ensuring the normal function of the separator in the lithium battery and the stability during long-term use. At the same time, during the reciprocating movement of the sliding box 602, the abutting block 702 contacts the air guiding plate 607. At this time, the abutting block 702 squeezes the air guiding plate 607, causing the air guiding plate 607 to deflect at an angle. At this time, the air guiding plate 607 with the adjusted angle can change the direction of the hot air, playing a certain guiding role for the hot air, and achieving a multi-angle preheating effect, ensuring that during the extension of the lithium battery separator, the preheating area is more uniform, guaranteeing the extension effect of the lithium battery, reducing the damage to the lithium battery separator extension caused by uneven heat transfer, reducing production costs, and improving the working efficiency of the device.

[0018] Please refer to Figures 1-8, on the basis of the above embodiments, in another embodiment of the present invention, the coating mechanism 7 includes a vertical plate 701, a blocking block 702, a second pushing triangular plate 703, an upper storage cylinder 704, a first brush column 706, a second brush column 707, a pushing block 710, and a semi-circular arc plate 711. The vertical plate 701 is fixedly connected to the top of the base 1. The blocking block 702 is fixedly connected to the right side of the vertical plate 701. The second pushing triangular plate 703 is slidably connected to the inner wall of the vertical plate 701. The upper storage cylinder 704 is fixedly connected to the inner wall of the vertical plate 701. The first brush column 706 is fixedly connected to the inner wall of the vertical plate 701. The second brush column 707 is fixedly connected to the inner wall of the vertical plate 701. The pushing block 710 is slidably connected to the inner wall of the vertical plate 701. The semi-circular arc plate 711 is fixedly connected to the inner wall of the pushing block 710. When the device is started, the reciprocating movement of the sliding box 602 will drive the first pushing triangular plate 608 to move. During the movement of the first pushing triangular plate 608, the first pushing triangular plate 608 will contact the second pushing triangular plate 703 and squeeze the second pushing triangular plate 703 through the inclined surface of the second pushing triangular plate 703, causing the second pushing triangular plate 703 to move upward. During the upward movement of the second pushing triangular plate 703, the second pushing triangular plate 703 will drive the pushing block 710 to move upward. The movement of the pushing block 710 will drive the semi-circular arc plate 711 to move. The upward movement of the semi-circular arc plate 711 will open the opening at the bottom of the upper storage cylinder 704, enabling the solvent-based coating to fall onto the first brush column 706. The first brush column 706 will evenly apply the solvent-based coating on the surface of the lithium battery separator, making the subsequent stretching and preheating effect better. Coating the surface of the lithium battery with a solvent-based coating can form a thin film on the surface of the separator, enhancing the mechanical strength and stretch resistance of the separator, and avoiding rupture or pore expansion during subsequent production or battery use. The coating mechanism 7 further includes a lower storage cylinder 705, a connecting block 708, and a sponge block 709. The lower storage cylinder 705 is fixedly connected to the inner wall of the vertical plate 701. The connecting block 708 is fixedly connected to the inner wall of the second pushing triangular plate 703. The sponge block 709 is fixedly connected to the inner wall of the connecting block 708. The semi-circular arc plate 711 is slidably connected to the inner wall of the upper storage cylinder 704. The connecting block 708 is slidably connected to the inner wall of the vertical plate 701. While the second pushing triangular plate 703 is moving, the second pushing triangular plate 703 will drive the connecting block 708 to move upward. The movement of the connecting block 708 will drive the sponge block 709 to move. The sponge block 709 will apply its solvent-based coating on the bottom surface of the lithium battery separator, enabling the solvent-based coating to be evenly applied on the surface of the lithium battery. Maintaining the uniform coating of the solvent-based coating can ensure the performance, stability, and safety of the battery, making the stretching effect of the lithium battery of this device better.

[0019] Working principle: When the device is started, the reciprocating movement of the sliding box 602 will drive the movement of the first pushing triangular plate 608. During the movement of the first pushing triangular plate 608, the first pushing triangular plate 608 will contact the second pushing triangular plate 703 and squeeze the second pushing triangular plate 703 through the inclined surface of the second pushing triangular plate 703, causing the second pushing triangular plate 703 to move upward. During the upward movement of the second pushing triangular plate 703, the second pushing triangular plate 703 will drive the pushing block 710 to move upward. The movement of the pushing block 710 will drive the movement of the semi-circular arc plate 711. The upward movement of the semi-circular arc plate 711 will open the opening at the bottom of the upper storage cylinder 704, enabling the solvent-based coating to fall onto the first brush column 706. The first brush column 706 will evenly apply the solvent-based coating on the surface of the lithium battery separator, making the subsequent stretching and preheating effect better. Coating the surface of the lithium battery with a solvent-based coating can form a thin film on the surface of the separator, enhancing the mechanical strength and tensile resistance of the separator, and avoiding rupture or pore expansion during subsequent production or battery use. While the second pushing triangular plate 703 is moving, the second pushing triangular plate 703 will drive the connecting block 708 to move upward. The movement of the connecting block 708 will drive the movement of the sponge block 709. The sponge block 709 will apply its own solvent-based coating on the bottom surface of the lithium battery separator, enabling the solvent-based coating to be evenly applied on the surface of the lithium battery. Maintaining the uniform coating of the solvent-based coating can ensure the performance, stability, and safety of the battery, making the stretching effect of the lithium battery of this device better.

[0020] The present invention provides a stretching device for a lithium battery separator. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented using existing technologies.

Claims

1. A lithium battery separator extension device, comprising a base (1) and a cylinder (2), characterized in that: A motor (3) is fixedly connected to the inner wall of the base (1), a bracket (4) is fixedly connected to the top of the base (1), a stretching mechanism (5) is provided on the top of the base (1), a preheating mechanism (6) is provided on the top of the base (1), and a coating mechanism (7) is provided on the top of the base (1); The stretching mechanism (5) comprises a chassis (501), a stabilizing plate (502), a pressure column (503), a connecting plate (504), a connecting column 1 (505), an extrusion plate (506), a rotating column 1 (507), a reel 1 (508), a pulley group (509), a rotating column 2 (510), a reel 2 (511), a disc (512), a cylindrical block (513), a stabilizing seat (514), and a pressure plate (515). The chassis (501) is fixedly connected to the top of the base (1), the stabilizing plate (502) is fixedly connected to the top of the chassis (501), the cylinder (2) is fixedly connected to the top of the stabilizing plate (502), the pressure column (503) is fixedly connected to the output end of the cylinder (2), the connecting plate (504) is fixedly connected to the bottom of the pressure column (503), and the connecting column 1 (505) is fixedly connected to the output end of the cylinder (2). The first and second rotating shafts (508) are connected to the bottom of the connecting plate (504); the extrusion plate (506) is fixedly connected to the bottom of the connecting column (505); the pressure plate (515) is fixedly connected to the inner wall of the chassis (501); the rotating column (507) is fixedly connected to the output end of the motor (3); the reel (508) is fixedly connected to the circumferential surface of the rotating column (507); the pulley group (509) is fixedly connected to the circumferential surface of the rotating column (507); the stabilizing seat (514) is fixedly connected to the top of the base (1); the rotating column (510) is rotatably connected to the inner wall of the stabilizing seat (514); the reel (511) is fixedly connected to the circumferential surface of the rotating column (510); the disc (512) is fixedly connected to the circumferential surface of the rotating column (510); and the cylindrical block (513) is fixedly connected to the front of the disc (512).

2. The lithium battery separator extension device according to claim 1, characterized in that: The rotating column 1 (507) is rotatably connected to the inner wall of the bracket (4), the circumferential surface of the rotating column 2 (510) is fixedly connected to the pulley on the left side of the pulley group (509), and the connecting plate (504) is in contact with the stabilizing plate (502).

3. The lithium battery separator extension device according to claim 2, characterized in that: The preheating mechanism (6) comprises a connecting rod (601), a sliding box (602), a fan assembly (603), and a heating assembly (604); the connecting rod (601) is rotatably connected to the surface of the cylindrical block (513); the sliding box (602) is rotatably connected to the inner wall of the connecting rod (601); the fan assembly (603) is fixedly mounted on the inner wall of the sliding box (602); and the heating assembly (604) is fixedly mounted on the inner wall of the sliding box (602).

4. The lithium battery separator extension device according to claim 3, characterized in that: The preheating mechanism (6) further comprises a fixed block (605), a hinged column (606), an air guide plate (607), and a first pushing triangle plate (608); the fixed block (605) is fixedly connected to the top of the sliding box (602); the hinged column (606) is connected to the inner wall of the fixed block (605) via a torsion spring; the air guide plate (607) is fixedly connected to the circumferential surface of the hinged column (606); and the first pushing triangle plate (608) is fixedly connected to the inner wall of the sliding box (602).

5. The lithium battery separator extension device according to claim 4, characterized in that: The sliding box (602) is slidably connected to the inner wall of the base (1), the number of the fan assembly (603) and the heating assembly (604) is set to be multiple, and the multiple fan assemblies (603) and the heating assembly (604) are linearly arrayed on the inner wall of the sliding box (602).

6. The lithium battery separator extension device according to claim 5, characterized in that: The coating mechanism (7) comprises a vertical plate (701), a stop block (702), a second pushing triangular plate (703), an upper storage cylinder (704), a first brush column (706), a second brush column (707), a push block (710), and a semi-arc plate (711); the vertical plate (701) is fixedly connected to the top of the base (1); the stop block (702) is fixedly connected to the right side of the vertical plate (701); and the second pushing triangular plate (703) is fixedly connected to the right side of the vertical plate (701). The brush column (706) is fixedly connected to the inner wall of the vertical plate (701); the brush column (707) is fixedly connected to the inner wall of the vertical plate (701); the push block (710) is slidably connected to the inner wall of the vertical plate (701); the upper storage cylinder (704) is fixedly connected to the inner wall of the vertical plate (701); the brush column (706) is fixedly connected to the inner wall of the vertical plate (701); the brush column (707) is fixedly connected to the inner wall of the vertical plate (701); the push block (710) is slidably connected to the inner wall of the vertical plate (701); and the semi-arc plate (711) is fixedly connected to the inner wall of the push block (710).

7. The lithium battery separator extension device according to claim 6, characterized in that: The coating mechanism (7) further comprises a lower storage cylinder (705), a connecting block (708), and a sponge block (709); the lower storage cylinder (705) is fixedly connected to the inner wall of the vertical plate (701); the connecting block (708) is fixedly connected to the inner wall of the second pushing triangle plate (703); and the sponge block (709) is fixedly connected to the inner wall of the connecting block (708).

8. The lithium battery separator extension device according to claim 7, characterized in that: The semi-arc plate (711) is slidably connected to the inner wall of the upper storage cylinder (704), and the connecting block (708) is slidably connected to the inner wall of the vertical plate (701).

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