An extrusion and flattening roller structure for cylindrical batteries

Abstract

This utility model relates to the technical field of cylindrical battery manufacturing equipment, and proposes a pressing and flattening roller structure for cylindrical batteries, including a flat roller and a blocking ring. The fixed part and the blocking part are respectively fixedly disposed at both ends of a conical roller, and the outer diameter of the conical roller near the fixed part is larger than the outer diameter of the end near the blocking part. The blocking ring is slidably and rotatably disposed on the conical roller. When the conical roller flattens the tab, the blocking ring and the blocking part respectively abut against the outer and inner rings of the tab. By setting the conical roller, the blocking part, and the blocking ring, when the side of the conical roller flattens the tab, the blocking part and the blocking ring can limit the inner and outer rings of the tab, preventing the tab from expanding outward after flattening. By allowing the blocking ring to slide and rotate with the conical roller, the distance between the blocking ring and the blocking part can be adjusted, thereby enabling the flattening roller to adapt to different specifications of cores and improving the adaptability of the flattening roller.

Description

Technical Field

[0001] This utility model relates to the technical field of cylindrical battery manufacturing equipment, and in particular to an extrusion and flattening roller structure for cylindrical batteries. Background Technology

[0002] The all-tab battery is an innovative battery design. Its core feature is that through structural innovation, the entire current collector tail is directly used as the tab. By increasing the conductive area of ​​the tab and the connection area at the connection point, and shortening the conductive distance of the tab, the internal resistance of the battery can be significantly reduced, and the rate performance and cycle life of the battery can be improved.

[0003] In the manufacturing process of all-tab batteries, the treatment of the tabs is crucial. Due to the large tab area of ​​all-tab batteries, a flattening process is required to ensure good contact between the tabs and the current collector. The flattening process not only improves the flatness of the tabs but also enhances the bonding strength between the tabs and the current collector, thereby reducing contact resistance and improving battery performance.

[0004] The leveling process is usually achieved through a dedicated leveling mechanism. For example, a leveling device and battery cell leveling equipment disclosed in utility model CN222927562U include a leveling part, a limiting head, and a squeezing part. When the leveling device performs a leveling operation on the tab, the limiting head and the squeezing part can squeeze the inner and outer rings of the tab, respectively, thereby preventing the tab layer from expanding outward after leveling.

[0005] However, in the above technical solution, the distance between the limiting head and the extrusion part is a fixed value. When performing the flattening operation on cores of different specifications, it is necessary to select flattening devices of different specifications, which is not conducive to improving the adaptability of the flattening equipment. Utility Model Content

[0006] In view of this, the present invention proposes a pressing and flattening roller structure for cylindrical batteries, which can adjust the distance between the blocking part and the blocking ring, so that the flattening roller can adapt to the winding core of different specifications and improve the adaptability of the flattening roller.

[0007] The technical solution of this utility model is achieved as follows: This utility model provides a pressing and flattening roller structure for cylindrical batteries, including a flat roller and a blocking ring, wherein,

[0008] The flat roller includes a conical wheel, a fixed part, and a blocking part. The fixed part and the blocking part are respectively fixedly disposed at both ends of the conical wheel, and the outer diameter of the conical wheel near the fixed part is larger than the outer diameter of the conical wheel near the blocking part.

[0009] The blocking ring is slidably and rotatably mounted on the conical wheel. When the conical wheel flattens the electrode tab, the blocking ring and the blocking part respectively abut against the outer ring and inner ring of the electrode tab.

[0010] Based on the above technical solutions, preferably, the blocking ring includes a collar and a sealing frame, wherein,

[0011] The collar is disposed on the outside of the conical wheel;

[0012] The sealing frame is fixedly mounted on the collar and located on the side of the conical wheel away from the blocking part.

[0013] More preferably, the inner diameter of the collar near the blocking part is smaller than the outer diameter of the cone wheel away from the blocking part.

[0014] Based on the above technical solutions, preferably, the system also includes a turntable, a first linear module, and a second linear module, wherein...

[0015] The turntable has a kneading hole in the middle;

[0016] Both the first linear module and the second linear module are fixedly mounted on the turntable, and their output ends are rotatably connected to the fixing part and the blocking ring, respectively.

[0017] More preferably, the first linear module includes a first telescopic device and a movable base, wherein,

[0018] The first telescopic device is fixedly mounted on the turntable;

[0019] The movable seat is slidably disposed on the turntable and fixedly connected to the output end of the first telescopic device, and the fixed part is rotatably disposed on the movable seat.

[0020] More preferably, the extension direction of the output end of the first telescopic device is perpendicular to the axis of the flattening hole and inclined to the axis of the fixing part.

[0021] More preferably, the second linear module includes a second telescopic device and a connecting frame, wherein,

[0022] The second telescopic device is fixedly mounted on the turntable;

[0023] The connecting frame is fixedly mounted on the output end of the second telescopic device and is rotatably connected to the blocking ring.

[0024] More preferably, the extension direction of the output end of the second telescopic device is parallel to the axis of the fixed part.

[0025] Based on the above technical solutions, preferably, the angle between the periphery of the blocking part and the periphery of the conical wheel is A, where A = 90° to 120°.

[0026] Based on the above technical solutions, preferably, the connection between the blocking part and the conical wheel is arc-shaped, and the radius of the arc is R, where R = 0.25mm to 0.5mm.

[0027] The extrusion and flattening roller structure for cylindrical batteries of this utility model has the following advantages over the prior art:

[0028] (1) By setting a conical wheel, a blocking part and a blocking ring, when the side of the conical wheel is pressed and kneaded, the blocking part and the blocking ring can limit the inner and outer rings of the electrode ear, so as to prevent the electrode ear from expanding outward after kneading. By allowing the blocking ring to slide and rotate with the conical wheel, the distance between the blocking ring and the blocking part can be adjusted, so that the kneading wheel can adapt to different specifications of cores and improve the adaptability of the kneading wheel.

[0029] (2) By setting up a first linear module and a second linear module, the position of the flat roller, the position of the blocking ring, and the distance between the blocking ring and the blocking part can be adjusted by using the first linear module and the second linear module to drive the flat roller and the blocking ring, thereby further improving the adjustment capability of the flat roller.

[0030] (3) By limiting the angle between the periphery of the blocking part and the periphery of the cone wheel, the shape of the flattened electrode tab can better meet the production requirements, thereby ensuring the overall performance of the flattened battery. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a perspective view of the flat roller and the blocking ring in a pressing and flattening roller structure for cylindrical batteries according to this utility model.

[0033] Figure 2 This is a cross-sectional view of the flat roller and the blocking ring in a compression and flattening roller structure for cylindrical batteries according to this utility model.

[0034] Figure 3 This is a cross-sectional view of the connection between the blocking part and the conical wheel in a compression and flattening wheel structure for cylindrical batteries according to this utility model.

[0035] Figure 4 This is a perspective view of a compression and flattening roller structure for cylindrical batteries according to the present invention.

[0036] Figure 5This is a perspective view of the first linear module in a compression and flattening roller structure for cylindrical batteries according to this utility model.

[0037] Figure 6 This is a cross-sectional view of the first linear module in the extrusion and flattening roller structure for cylindrical batteries according to this utility model.

[0038] Figure 7 This is a cross-sectional view of a core flattened using an extrusion and flattening roller structure for cylindrical batteries according to the present invention.

[0039] The components are: 1. Turntable; 101. Flattening hole; 2. First linear module; 21. First telescopic device; 22. Moving seat; 3. Second linear module; 31. Second telescopic device; 32. Connecting frame; 4. Flat roller; 41. Conical wheel; 42. Fixing part; 43. Blocking part; 5. Blocking ring; 51. Collar; 52. Sealing frame; 6. Electrode. Detailed Implementation

[0040] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] The core and tab 6 are crucial components of a full-tab battery. The core is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. A central hole provides a channel for electrolyte injection, allowing the electrolyte to penetrate the core more quickly and evenly, improving wetting, reducing internal resistance, and enhancing charge / discharge performance. One end of tab 6 extends into the electrode material within the core, while the other end protrudes to connect with the current collector.

[0042] In the production process of all-tab cylindrical batteries, flattening tab 6 is an indispensable step. After flattening, tab 6 forms a dense solid, effectively increasing the contact area, making welding more stable, and helping to improve welding quality, thereby enhancing the battery's safety and rate performance.

[0043] This utility model discloses a pressing and flattening roller structure for cylindrical batteries, comprising a turntable 1, a first linear module 2, a second linear module 3, a flat roller 4, and a blocking ring 5, used to flatten the tabs 6 and prevent the tabs 6 from expanding outward after flattening.

[0044] The flat roller 4 includes a conical roller 41, a fixing part 42, and a blocking part 43. The conical roller 41 has a conical structure. The fixing part 42 and the blocking part 43 are respectively fixedly arranged at both ends of the conical roller 41, and the outer diameter of the end of the conical roller 41 near the fixing part 42 is larger than the outer diameter of the end near the blocking part 43. The conical roller 41, the fixing part 42, and the blocking part 43 are coaxially arranged. When the conical roller 41 rotates around the center line of the core, the conical roller 41 can also rotate around its own axis. At this time, the circumference of the conical roller 41 presses the end of the tab 6 away from the core, so that the tab 6 is wrinkled and layered to form a flattened layer with a certain degree of compactness and thickness.

[0045] like Figure 6 and Figure 7 As shown, the tab 6 has a circular structure and is coaxially arranged with the core. When the tab 6 is flattened, the flattened tab 6 will expand outward, that is, the inner ring of the tab 6 extends into the center hole of the core, or the outer ring of the tab 6 extends outward from the outside of the core, which affects the performance of the battery.

[0046] The blocking ring 5 is disposed on the conical wheel 41 and spaced apart from the blocking part 43. For example... Figure 6 As shown, when the conical wheel 41 presses the tab 6 around its periphery, the blocking ring 5 and the blocking part 43 respectively abut against the outer and inner rings of the tab 6, thereby preventing the tab 6 from expanding outward after being flattened.

[0047] The blocking ring 5 is slidably and rotatably mounted on the conical wheel 41. By utilizing the relative sliding between the blocking ring 5 and the conical wheel 41, the distance between the blocking ring 5 and the blocking part 43 can be adjusted, so that the flattening wheel can adapt to different specifications of the tabs 6, thereby improving the adaptability of the flattening wheel and eliminating the processing errors of the tabs 6 or the flattening wheel.

[0048] like Figure 2 As shown, the blocking ring 5 includes a collar 51 and a sealing frame 52. The collar 51 is disposed on the outer side of the conical wheel 41. The collar 51 is rotatably and slidably connected to the conical wheel 41 and is used to abut against the outer ring of the electrode tab 6. The sealing frame 52 is fixedly disposed on the collar 51 and is located on the side of the conical wheel 41 away from the blocking part 43. When the collar 51 approaches the blocking part 43, the sealing frame 52 will abut against the end of the conical wheel 41 away from the blocking part 43. At this time, the distance between the collar 51 and the blocking part 43 is the smallest, thereby avoiding damage to the electrode tab 6 due to the excessively small distance between the collar 51 and the blocking part 43.

[0049] The collar 51 has a conical structure. The inner diameter of the end of the collar 51 near the blocking part 43 is smaller than the inner diameter of the end of the collar 51 away from the blocking part 43. The collar 51 is fitted on the outside of the conical wheel 41, thereby realizing the rotation and sliding connection between the two.

[0050] Preferably, the inner diameter of the collar 51 near the blocking part 43 is smaller than the outer diameter of the conical wheel 41 away from the blocking part 43. When the collar 51 is away from the blocking part 43, it will abut against the circumference of the conical wheel 41, at which point the distance between the collar 51 and the blocking part 43 is at its maximum. When the collar 51 is close to the blocking part 43, a gap will be generated between the collar 51 and the conical wheel 41. Therefore, it is necessary to limit the sliding distance of the collar 51 so that the inner diameter of the gap between the collar 51 and the conical wheel 41 is smaller than the outer diameter of the tab 6, to prevent the tab 6 from extending into the gap between the collar 51 and the conical wheel 41 during the flattening process.

[0051] like Figure 2 As shown, the angle between the periphery of the blocking part 43 and the periphery of the cone wheel 41 is A.

[0052] In some embodiments, A = 90° to 120°, that is, the angle between the periphery of the blocking part 43 and the periphery of the conical wheel 41 is 90°, 105° or 120°, etc. When 90°≤A≤95°, the corner of the flattened electrode tab 6 that abuts against the blocking part 43 is a right angle. When 100°≤A≤120°, the corner of the flattened electrode tab 6 that abuts against the blocking part 43 is an obtuse angle, making the flattened electrode tab 6 more compact.

[0053] like Figure 3 As shown, the connection between the blocking part 43 and the conical wheel 41 is arc-shaped, which can not only improve the guiding performance of the flattening wheel on the tab 6, but also effectively avoid friction damage to the tab 6 at the connection between the blocking part 43 and the conical wheel 41, thereby improving the flattening quality of the tab 6.

[0054] like Figure 3 As shown, the radius of the arc at the connection between the blocking part 43 and the cone wheel 41 is R.

[0055] In some embodiments, 0.25mm≤R≤0.5mm, that is, the radius of the rounded corner 301 is 0.25mm, 0.4mm or 0.5mm, etc. This results in a better guiding effect at the connection between the blocking part 43 and the cone wheel 41, making the flattening layer of the electrode tab 6 smoother.

[0056] like Figure 4 As shown, the turntable 1 is used to connect to the rotation drive device. The flat roller 4 and the blocking ring 5 are set on the turntable 1. When the rotation drive device drives the turntable 1 to rotate, it can drive the flat roller 4 and the blocking ring 5 to rotate.

[0057] The turntable 1 has a kneading hole 101 in the middle, such as Figure 4 As shown, when the rotating turntable 1 is moved downwards and the tab 6 is inserted into the flattening hole 101, the flat roller 4 can flatten the tab 6.

[0058] The flat roller 4 and the blocking ring 5 are respectively mounted on the turntable 1 via the first linear module 2 and the second linear module 3, as shown below. Figure 6 As shown, the first linear module 2 and the second linear module 3 are both fixedly mounted on the turntable 1. The output ends of the first linear module 2 and the second linear module 3 are rotatably connected to the fixed part 42 and the blocking ring 5, respectively. This allows the flat roller 4 and the blocking ring 5 to rotate, and the positions of the flat roller 4 and the blocking ring 5 can be adjusted by extending and retracting the output end of the first linear module 2 and the output end of the second linear module 3, so as to adjust the position of the flat roller 4, the position of the blocking ring 5, and the distance between the blocking ring 5 and the blocking part 43.

[0059] In some embodiments, the first linear module 2 includes a first telescopic device 21 and a movable base 22, such as Figure 5 As shown, the first telescopic device 21 is fixedly mounted on the turntable 1, and the movable seat 22 is slidably mounted on the turntable 1 via a slide rail. The movable seat 22 is fixedly connected to the output end of the first telescopic device 21, and the fixed part 42 is rotatably mounted on the movable seat 22. By extending and retracting the output end of the first telescopic device 21, the movable seat 22 and the fixed part 42 can be moved to adjust the position of the blocking part 43.

[0060] Furthermore, the extension direction of the output end of the first extension device 21 is perpendicular to the axis of the kneading hole 101, and the extension direction of the output end of the first extension device 21 is inclined to the axis of the fixed part 42, so that the flat roller 4 can move radially along the turntable 1, and the position of the blocking part 43 can be adjusted so that the kneading roller can adapt to the core center hole of different specifications.

[0061] In some embodiments, the second linear module 3 includes a second telescopic device 31 and a connecting frame 32, such as Figure 5 As shown, the second telescopic device 31 is fixedly mounted on the turntable 1, and the connecting frame 32 is fixedly mounted on the output end of the second telescopic device 31. The connecting frame 32 is rotatably connected to the blocking ring 5. When the output end of the second telescopic device 31 extends or retracts, it can drive the connecting frame 32 and the blocking ring 5 connected to the connecting frame 32 to move, thereby adjusting the position of the collar 51.

[0062] Furthermore, the extension direction of the output end of the second telescopic device 31 is parallel to the axis of the fixed part 42, thereby driving the blocking ring 5 to move along the axial direction of the flat roller 4, adjusting the position of the blocking ring 5, and adjusting the distance between the blocking ring 5 and the blocking part 43.

[0063] The first telescopic device 21 and the second telescopic device 31 can use a servo motor and lead screw combination structure, or an electric telescopic rod structure; the rotation drive device can use a servo motor.

[0064] like Figure 4As shown, there are multiple first straight module 2, multiple second straight module 3, multiple flat rollers 4 and multiple blocking rings 5. The multiple first straight module 2, multiple second straight module 3, multiple flat rollers 4 and multiple blocking rings 5 ​​correspond one-to-one, thereby improving the kneading efficiency and kneading uniformity of the electrode 6.

[0065] The method of using the extrusion and flattening roller structure for cylindrical batteries according to this utility model is as follows:

[0066] First, connect turntable 1 to the output end of the rotary drive device, causing turntable 1 to rotate around the axis of the flattening hole 101. Then, fix the core, positioning the tab 6 to be flattened at the upper end of the core. Next, move turntable 1 so that the tab 6 passes into the flattening hole 101, as shown in the image. Figure 4 As shown, the turntable 1 continues to move downwards, using the side wall of the conical wheel 41 to press the upper end of the tab 6. The blocking part 43 and the blocking ring 5 respectively limit the inner and outer rings of the tab 6, so that the flattened tab 6 forms as shown. Figure 7 The state shown. During this period, the positions of the flat roller 4 and the blocking ring 5, or the distance between the blocking part 43 and the blocking ring 5, can also be adjusted using the first straight module 2 and the second straight module 3, so that the flat roller can adapt to different specifications of core.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressing and flattening roller structure for cylindrical batteries, characterized in that: Includes a flat roller (4) and a retaining ring (5), wherein, The flat roller (4) includes a conical roller (41), a fixed part (42) and a blocking part (43). The fixed part (42) and the blocking part (43) are respectively fixedly disposed at both ends of the conical roller (41), and the outer diameter of the conical roller (41) near the fixed part (42) is larger than the outer diameter of the end near the blocking part (43). The blocking ring (5) is slidably and rotatably disposed on the conical wheel (41). When the conical wheel (41) flattens the tab (6), the blocking ring (5) and the blocking part (43) respectively abut against the outer ring and inner ring of the tab (6).

2. The extrusion and flattening roller structure for cylindrical batteries as described in claim 1, characterized in that: The blocking ring (5) includes a collar (51) and a sealing frame (52), wherein, The collar (51) is disposed on the outside of the conical wheel (41); The sealing frame (52) is fixedly mounted on the collar (51) and located on the side of the cone wheel (41) away from the blocking part (43).

3. The extrusion and flattening roller structure for cylindrical batteries as described in claim 2, characterized in that: The inner diameter of the collar (51) near the blocking part (43) is smaller than the outer diameter of the cone wheel (41) away from the blocking part (43).

4. The extrusion and flattening roller structure for cylindrical batteries as described in claim 1, characterized in that: It also includes a turntable (1), a first linear module (2), and a second linear module (3), wherein, The turntable (1) is provided with a kneading hole (101) in the middle; The first linear module (2) and the second linear module (3) are both fixedly mounted on the turntable (1), and their output ends are rotatably connected to the fixing part (42) and the blocking ring (5), respectively.

5. The extrusion and flattening roller structure for cylindrical batteries as described in claim 4, characterized in that: The first linear module (2) includes a first telescopic device (21) and a movable base (22), wherein, The first telescopic device (21) is fixedly mounted on the turntable (1); The movable seat (22) is slidably disposed on the turntable (1) and fixedly connected to the output end of the first telescopic device (21), and the fixed part (42) is rotatably disposed on the movable seat (22).

6. The extrusion and flattening roller structure for cylindrical batteries as described in claim 5, characterized in that: The extension direction of the output end of the first telescopic device (21) is perpendicular to the axis of the flattening hole (101) and inclined to the axis of the fixing part (42).

7. The extrusion and flattening roller structure for cylindrical batteries as described in claim 4, characterized in that: The second linear module (3) includes a second telescopic device (31) and a connecting frame (32), wherein, The second telescopic device (31) is fixedly mounted on the turntable (1); The connecting frame (32) is fixedly mounted on the output end of the second telescopic device (31) and is rotatably connected to the blocking ring (5).

8. The extrusion and flattening roller structure for cylindrical batteries as described in claim 7, characterized in that: The extension direction of the output end of the second telescopic device (31) is parallel to the axis of the fixed part (42).

9. A pressing and flattening roller structure for cylindrical batteries as described in any one of claims 1-8, characterized in that: The angle between the periphery of the blocking part (43) and the periphery of the conical wheel (41) is A, where A = 90° to 120°.

10. A pressing and flattening roller structure for cylindrical batteries as described in any one of claims 1-8, characterized in that: The connection between the blocking part (43) and the conical wheel (41) is arc-shaped, and the radius of the arc is R, where R = 0.25mm to 0.5mm.

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