Traction auxiliary device for winding lithium battery diaphragm

Abstract

The utility model relates to the technical field of diaphragm production, and discloses a traction auxiliary device for winding a lithium battery diaphragm, which comprises a rack, a first traction roller and a second traction roller which are rotationally arranged below the rack, and a third traction roller which is positioned between the first traction roller and the second traction roller and can slide along the vertical direction. The side, opposite to the second traction roller, of the first traction roller crosses the left end of the third traction roller in the vertical direction, and the section, opposite to the first traction roller, of the second traction roller crosses the right end of the third traction roller in the vertical direction. The device adapts to the winding speed change through the sliding adjusting function of the third traction roller, and the tension control precision of the diaphragm is dynamically adjusted; meanwhile, due to the staggered overlapping design of the first traction roller, the second traction roller and the third traction roller, the diaphragm wrap angle contact area is doubly increased.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm production technology, and in particular to a traction auxiliary device for winding lithium battery diaphragms. Background Technology

[0002] Lithium-ion battery separators (especially ultra-thin, high-porosity products prepared using wet processes) face process adaptability challenges during the traction molding stage. Traditional single-traction roller designs, due to their limited contact length with the separator, result in insufficient friction, easily leading to separator slippage failure under low-tension conditions, manifesting as uneven thickness, surface micro-marks, and other morphological defects. Simultaneously, the short contact arc causes discrete tension distribution, exacerbating longitudinal tensile strain differences in the separator, causing microporous structure deformation or pore size distribution shift, directly affecting battery electrochemical performance. This problem is further amplified by the high ductility of wet-process separators, restricting the stability of high-end separator production processes and product consistency. Utility Model Content

[0003] The present invention aims to improve at least one technical problem in the prior art.

[0004] This utility model provides a traction auxiliary device for winding lithium battery separators, comprising:

[0005] frame;

[0006] The first traction roller is rotatably mounted on the frame;

[0007] The second traction roller is rotatably mounted on the frame;

[0008] The third traction roller is located between the first traction roller and the second traction roller, and the third traction roller slides in the up-down direction between the first traction roller and the second traction roller;

[0009] The side of the first traction roller opposite to the second traction roller extends vertically over the left end of the third traction roller, and the section of the second traction roller opposite to the first traction roller extends vertically over the right end of the third traction roller, thereby increasing the wrap angle of the third traction roller.

[0010] As some sub-solutions of the above technical solution, the traction auxiliary device further includes a sliding assembly, which includes a carriage and a load block. The frame includes a vertical guide rail and a stand connected to the top side of the guide rail. The carriage slides along the guide rail. The first traction roller and the second traction roller are both mounted on the stand. The third traction roller is rotatably mounted on the carriage. The load block is mounted on the carriage.

[0011] As some sub-solutions of the above technical solution, the carriage includes a first side frame, a second side frame, an upper left beam, and an upper right beam. The upper left beam is connected to the left side of the first side frame and the second side frame, and the upper right beam is connected to the right side of the first side frame and the second side frame. The upper left beam and the upper right beam are located on the left and right sides of the guide rail, respectively. A groove matching the width of the guide rail is formed between the upper left beam and the upper right beam. The groove slides relative to the guide rail. The third traction roller is rotatably disposed between the upper left beam and the upper right beam by means of a connecting beam.

[0012] As some sub-solutions of the above technical solution, the carriage further includes a lower left beam and a lower right beam, which are respectively located below the upper left beam and the upper right beam. The lower left beam is connected to the left side of the first side frame and the second side frame, and the lower right beam is connected to the right side of the first side frame and the second side frame. The load block acts on the carriage through the lower left beam and the lower right beam.

[0013] As some sub-solutions of the above technical solution, the carriage further includes a connecting plate and a support plate. The connecting plate is mounted above the lower left beam and the lower right beam. The connecting plate is provided with a through hole, and a screw and a nut are provided at the through hole. The nut is located on the connecting plate. The screw passes through the through hole from bottom to top and is threadedly connected to the nut. The support plate is connected to the lower end of the screw, and the load block is placed on the support plate.

[0014] As some sub-solutions of the above technical solution, the carriage also includes a left load-bearing beam and a right load-bearing beam, which are located on the front and rear sides of the screw, respectively, and the load block fixes the left load-bearing beam and the right load-bearing beam to the support plate.

[0015] As some sub-solutions of the above technical solution, the combination of the connecting plate, nut, screw, load block and pallet is used as the load group, and the number of the load groups is two sets, with the two sets of load blocks symmetrically arranged on both sides of the third traction roller.

[0016] The beneficial effects of this utility model are as follows: The design of the third traction roller being able to slide in the vertical direction enables the traction auxiliary device to adapt to the winding speed and change the tension applied to the diaphragm. The side of the first traction roller opposite to the second traction roller passes over the left end of the third traction roller in the vertical direction, which can increase the wrap angle of the diaphragm when it passes over the third traction roller, thereby increasing the contact area between the diaphragm and the third traction roller. Similarly, the section of the second traction roller opposite to the first traction roller passes over the right end of the third traction roller in the vertical direction, which effectively increases the contact area between the diaphragm and the third traction roller. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0019] Figure 2 This is a structural diagram of the carriage, the third traction roller, and the load block.

[0020] Figure 3 This is the front sectional view of the present invention.

[0021] In the attached diagram: 1-frame; 11-guide rail;

[0022] 2-First traction roller;

[0023] 3-Second traction roller;

[0024] 4-Third traction roller;

[0025] 51-Slide carriage; 511-First side frame; 512-Second side frame; 513-Upper left beam; 514-Upper right beam; 515-Lower left beam; 516-Lower right beam; 52-Load block; 521-Connecting plate; 522-Support plate; 523-Screw; 524-Nut; 525-Left load beam; 526-Right load beam. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] This embodiment relates to a traction auxiliary device for winding lithium battery separators, which is particularly suitable for traction of high-precision separators.

[0029] Reference Figures 1 to 3 A traction assist device for winding a lithium battery separator in this embodiment includes:

[0030] Rack 1;

[0031] The first traction roller 2 is rotatably mounted on the frame 1;

[0032] The second traction roller 3 is rotatably mounted on the frame 1;

[0033] The third traction roller 4 is located between the first traction roller 2 and the second traction roller 3, and the third traction roller 4 slides in the up-down direction between the first traction roller 2 and the second traction roller 3;

[0034] The side of the first traction roller 2 opposite to the second traction roller 3 extends over the left end of the third traction roller 4 in the vertical direction, and the section of the second traction roller 3 opposite to the first traction roller 2 extends over the right end of the third traction roller 4 in the vertical direction, so as to increase the wrap angle of the third traction roller 4.

[0035] The design of the third traction roller 4, which can slide vertically, enables this traction auxiliary device to adapt to the winding speed and change the tension applied to the diaphragm, thus assisting the traction operation. The side of the first traction roller 2 opposite to the second traction roller 3 extends vertically past the left end of the third traction roller 4, increasing the wrap angle of the diaphragm as it passes over the third traction roller 4, thereby increasing the contact area between the diaphragm and the third traction roller 4. Similarly, the section of the second traction roller 3 opposite to the first traction roller 2 extends vertically past the right end of the third traction roller 4, effectively increasing the contact area between the diaphragm and the third traction roller 4. Furthermore, the design of the third traction roller 4 sliding vertically enables dynamic adjustment of the wrap angle, adapting to the tension requirements at different winding speeds and improving the response accuracy of the traction system. The staggered overlapping arrangement of the first traction roller 2, the second traction roller 3, and the third traction roller 4 doubles the expansion of the diaphragm wrap angle contact range, significantly increasing the frictional force between the film surface and the roller body, effectively suppressing slippage under low tension conditions, and reducing thickness fluctuations and surface scratches. Meanwhile, the design optimizes the wrap angle distribution of the diaphragm running path, reduces local stress concentration, and avoids membrane stretching deformation or microporous structure damage, thereby improving winding flatness and membrane surface quality stability, and meeting the high-precision, low-defect production requirements of wet process diaphragms.

[0036] To further improve the stability and durability of the traction auxiliary device, the frame 1 is made of high-strength material and undergoes precision machining and heat treatment to ensure that it can withstand large loads and long-term operation. At the same time, the surface of the traction roller is also specially treated (e.g., sandblasting the surface of the traction roller to form a micro-uneven structure) to increase the coefficient of friction between it and the diaphragm and prevent the diaphragm from slipping or falling off during traction.

[0037] The traction auxiliary device also includes a sliding assembly, which comprises a carriage 51 and a load block 52. The frame 1 includes a vertical guide rail 11 and a stand connected to the top side of the guide rail 11. The carriage 51 slides along the guide rail 11. The first traction roller 2 and the second traction roller 3 are both mounted on the stand. The third traction roller 4 is rotatably mounted on the carriage 51. The load block 52 is mounted on the carriage 51. Through the sliding design of the carriage 51 along the vertical guide rail 11, combined with the counterweight adjustment function of the load block 52, a dynamic tension compensation mechanism is formed. When the third traction roller 4 moves with the carriage 51, the gravity balancing effect of the load block 52 can adaptively adjust the diaphragm traction tension, which is especially suitable for stable traction requirements in low-tension scenarios.

[0038] The carriage 51 includes a first side frame 511, a second side frame 512, an upper left beam 513, and an upper right beam 514. The upper left beam 513 is connected to the left side of the first side frame 511 and the second side frame 512, and the upper right beam 514 is connected to the right side of the first side frame 511 and the second side frame 512. The upper left beam 513 and the upper right beam 514 are located on the left and right sides of the guide rail 11, respectively. A groove matching the width of the guide rail 11 is formed between the upper left beam 513 and the upper right beam 514. The groove slides relative to the guide rail 11. The third traction roller 4 is rotatably disposed between the upper left beam 513 and the upper right beam 514 by means of a connecting beam. The carriage 51 of this traction auxiliary device adopts a frame structure consisting of a first side frame 511, a second side frame 512, and split upper left beam 513 and upper right beam 514. Through precise width matching between the sliding groove and the guide rail 11, the carriage 51 achieves stable sliding along the guide rail 11, effectively suppressing lateral offset and ensuring the accuracy of the running trajectory of the third traction roller 4. The upper left beam 513 and upper right beam 514 are symmetrically distributed on both sides of the guide rail 11, forming a rigid support frame that can bear the dynamic load under high-speed traction, avoiding diaphragm vibration or uneven stretching caused by vibration. The carriage 51, by adding a lower left beam 515 and a lower right beam 516, forms a double-layer beam frame structure, significantly improving overall rigidity and load distribution uniformity. The design of the load block 52 acting on the lower beam shifts the point of gravity downwards, lowering the center of gravity of the carriage 51, enhancing the anti-overturning ability of the carriage 51 during sliding, and simultaneously avoiding the risk of upper beam deformation due to high-speed traction vibration. The rigid connection between the lower beam and the side frame further disperses the dynamic load of the traction rollers, ensuring the structural stability of the carriage 51 under extreme conditions (such as sudden tension changes or film surface vibration).

[0039] Furthermore, the carriage 51 also includes a lower left beam 515 and a lower right beam 516, which are respectively located below the upper left beam 513 and the upper right beam 514. The lower left beam 515 is connected to the left side of the first side frame 511 and the second side frame 512, and the lower right beam 516 is connected to the right side of the first side frame 511 and the second side frame 512. The load block 52 acts on the carriage 51 through the lower left beam 515 and the lower right beam 516. This carriage 51 forms a split double-layer frame structure by adding the lower left beam 515 and the lower right beam 516, allowing the load block 52 to act directly on the lower beam, achieving precise transmission and uniform distribution of tension force. The weight of the load block 52 acts directly on the bottom of the carriage 51 through the lower beam, and combined with the limiting structure of the guide rail 11, significantly improves the carriage 51's resistance to lateral vibration.

[0040] The carriage 51 also includes a connecting plate 521 and a support plate 522. The connecting plate 521 is mounted above the lower left beam 515 and the lower right beam 516. The connecting plate 521 has a through hole, at which a screw 523 and a nut 524 are located. The nut 524 is mounted on the connecting plate 521. The screw 523 passes through the through hole from bottom to top and is threadedly connected to the nut 524. The support plate 522 is connected to the lower end of the screw 523. The load block 52 is placed on the support plate 522. This carriage 51, through the combined design of the connecting plate 521, support plate 522, and screw 523 and nut 524 assemblies, constructs a modular load block 52 adjustment system. The load block 52 is placed on the support plate 522, and its vertical height is adjusted by rotating the screw 523 to assemble different numbers of load blocks 52. After assembly, the load blocks 52 are compacted and fixed to adapt to different tension loading requirements. In addition, the design of fixing the nut 524 to the connecting plate 521 simplifies the disassembly and assembly process of the load block 52, and is especially suitable for the rapid changeover needs of multi-batch, small-volume diaphragm production.

[0041] The carriage 51 also includes a left load-bearing beam 525 and a right load-bearing beam 526, which are located at the front and rear sides of the screw 523, respectively. The left and right load-bearing beams 525 and 526 are fixed to the support plate 522. This fixed design ensures that the weight of the load block 52 is evenly transferred to the lower beam of the carriage 51 via the screw 523, eliminating the uneven load caused by unilateral counterweight and ensuring the dynamic balance of the carriage 51 during sliding. Furthermore, in this embodiment, to further ensure the stability of the left and right load-bearing beams 525 and 526, through holes can be made in both beams, and bolts can be inserted through these holes to clamp them and prevent them from loosening.

[0042] The combination of the connecting plate 521, nut 524, screw 523, load block 52, and support plate 522 constitutes the load group. There are two sets of the load group, with the two sets of load blocks 52 symmetrically arranged on both sides of the third traction roller 4. By symmetrically arranging the two sets of load groups, the load blocks 52 are evenly distributed on both sides of the third traction roller 4, effectively eliminating the uneven loading phenomenon caused by unilateral counterweight.

[0043] The preferred embodiments of the present invention have been described in detail above, but the present disclosure is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present disclosure.

Claims

1. A traction aid for winding of lithium battery separators, characterized in that: include: Rack (1); The first traction roller (2) is rotatably mounted on the frame (1); The second traction roller (3) is rotatably mounted on the frame (1); The third traction roller (4) is located between the first traction roller (2) and the second traction roller (3), and the third traction roller (4) slides in the up-down direction between the first traction roller (2) and the second traction roller (3); The side of the first traction roller (2) opposite to the second traction roller (3) extends over the left end of the third traction roller (4) in the vertical direction, and the section of the second traction roller (3) opposite to the first traction roller (2) extends over the right end of the third traction roller (4) in the vertical direction, so as to increase the wrap angle of the third traction roller (4).

2. A traction aid for winding a lithium battery separator according to claim 1, characterized in that: The traction auxiliary device further includes a sliding assembly, which includes a slide (51) and a load block (52). The frame (1) includes a vertical guide rail (11) and a stand connected to the top side of the guide rail (11). The slide (51) slides along the guide rail (11). The first traction roller (2) and the second traction roller (3) are both mounted on the stand. The third traction roller (4) is rotatably mounted on the slide (51). The load block (52) is mounted on the slide (51).

3. A traction aid for winding a lithium battery separator according to claim 2, characterized in that: The carriage (51) includes a first side frame (511), a second side frame (512), an upper left beam (513), and an upper right beam (514). The upper left beam (513) is connected to the left side of the first side frame (511) and the second side frame (512), and the upper right beam (514) is connected to the right side of the first side frame (511) and the second side frame (512). The upper left beam (513) and the upper right beam (514) are located on the left and right sides of the guide rail (11), respectively. A groove matching the width of the guide rail (11) is formed between the upper left beam (513) and the upper right beam (514). The groove slides relative to the guide rail (11). The third traction roller (4) is rotatably disposed between the upper left beam (513) and the upper right beam (514) by means of a connecting beam.

4. A traction aid for winding a lithium battery separator according to claim 3, characterized in that: The carriage (51) also includes a lower left beam (515) and a lower right beam (516). The lower left beam (515) and the lower right beam (516) are respectively located below the upper left beam (513) and the upper right beam (514). The lower left beam (515) is connected to the left side of the first side frame (511) and the second side frame (512). The lower right beam (516) is connected to the right side of the first side frame (511) and the second side frame (512). The load block (52) acts on the carriage (51) through the lower left beam (515) and the lower right beam (516).

5. A traction aid for winding a lithium battery separator according to claim 4, characterized in that: The carriage (51) also includes a connecting plate (521) and a support plate (522). The connecting plate (521) is mounted above the lower left beam (515) and the lower right beam (516). The connecting plate (521) has a through hole. A screw (523) and a nut (524) are provided at the through hole. The nut (524) is located on the connecting plate (521). The screw (523) passes through the through hole from bottom to top and is threadedly connected to the nut (524). The support plate (522) is connected to the lower end of the screw (523). The load block (52) is placed on the support plate (522).

6. The traction auxiliary device for winding a lithium battery separator according to claim 5, characterized in that: The carriage (51) also includes a left load beam (525) and a right load beam (526), ​​which are located on the front and rear sides of the screw (523), respectively. The load block (52) fixes the left load beam (525) and the right load beam (526) on the support plate (522).

7. A traction aid for winding a lithium battery separator according to claim 6, characterized in that: The combination of the connecting plate (521), nut (524), screw (523), load block (52) and pallet (522) is a load set. There are two load sets, and the two sets of load blocks (52) are symmetrically arranged on both sides of the third traction roller (4).

Images