Anti-collapse kneading wheel structure for cylindrical lithium battery

Abstract

The utility model relates to cylindrical battery manufacturing equipment technical field, proposes a kind of anti-collapse kneading wheel structure for cylindrical lithium battery, including carousel, support frame, runner and extruding wheel, wherein, the support frame is fixedly arranged on the carousel;The runner includes cone wheel and holds part, the cone wheel rotation is arranged on the support frame;The holding part is coaxially fixed at one end of the cone wheel, for holding the outer ring of the tab;The extruding wheel rotation is arranged on the support frame, and it is located at one end of the cone wheel away from the holding part, and the extruding wheel is used to hold the inner ring of the tab.The utility model sets up cone wheel, holding part and extruding wheel, not only can the end surface of tab be kneaded flat, but also can the outer ring and inner ring of tab be limited, avoid the phenomenon that tab appears after kneading flat, by letting extruding wheel can independently rotate, the specification of extruding wheel can be reduced, and the kneading efficiency and kneading quality of tab are improved.

Description

Technical Field

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

[0002] The all-tab cylindrical lithium battery is an innovative battery design. Its core feature is that through structural innovation, the entire current collector tail is 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 typically achieved using a dedicated leveling mechanism. For example, a battery cell leveling device disclosed in utility model CN220781852U has a first limiting part and a first transition part on its leveling wheel. These parts limit the inner ring of the electrode tab, preventing the leveled electrode tab from extending into the center hole of the core. However, since the first limiting part is coaxial with the leveling wheel, its size needs to be relatively large to limit the inner ring of the electrode tab. This not only hinders the lightweight design of the leveling device but also limits the number of leveling wheels used, thus reducing the leveling efficiency of the electrode tab. Utility Model Content

[0005] In view of this, the present invention proposes an anti-collapse flattening wheel structure for cylindrical lithium batteries. By setting a squeezing wheel that is not coaxial with the rotating wheel but rotatably connected to the support frame, the space occupied by the squeezing wheel can be reduced, and the flattening efficiency and flattening quality of the tabs can be improved.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides an anti-collapse flattening wheel structure for cylindrical lithium batteries, including a turntable, a support frame, a rotating wheel, and a pressing wheel, wherein...

[0007] The support frame is fixedly mounted on the turntable;

[0008] The rotating wheel includes a conical wheel and a supporting part. The conical wheel is rotatably mounted on the support frame, and the circumference of the conical wheel is used to flatten the end face of the electrode tab. The supporting part is coaxially fixed to one end of the conical wheel and is used to support the outer ring of the electrode tab.

[0009] The extrusion wheel is rotatably mounted on the support frame and located at the end of the cone wheel away from the abutment portion. The extrusion wheel is used to abut the inner ring of the electrode tab.

[0010] Based on the above technical solutions, preferably, a reinforcing rod is also included, and the rotating wheel further includes a fixing part, wherein...

[0011] The fixing part is coaxially fixed to the end of the supporting part away from the conical wheel;

[0012] The reinforcing rod is fixedly mounted on the turntable and rotatably connected to the fixing part.

[0013] More preferably, the fixing part is rotatably connected to the support frame.

[0014] Based on the above technical solutions, preferably, the support frame includes a fixed rod, a rotating rod, and a mounting rod, wherein,

[0015] The fixing rod is fixedly mounted on the turntable;

[0016] One end of the rotating rod is fixedly mounted on the fixed rod and is rotatably connected to the conical wheel;

[0017] The mounting rod is fixedly mounted at the end of the rotating rod away from the fixed rod and is rotatably connected to the extrusion wheel.

[0018] More preferably, the mounting rod includes a connecting rod and a supporting plate, wherein,

[0019] One end of the connecting rod is fixedly mounted on the rotating rod, and the extrusion wheel is rotatably mounted on the connecting rod;

[0020] The abutment plate is fixedly mounted on the connecting rod and abuts against the bottom end of the extrusion wheel.

[0021] More preferably, the connecting rod is perpendicular to the turntable.

[0022] Based on the above technical solutions, preferably, the circumference of the extrusion wheel is tapered, and the outer diameter of the extrusion wheel gradually decreases in the direction away from the turntable.

[0023] More preferably, the angle between the circumference of the conical wheel and the circumference of the extrusion wheel is A, where A = 90° to 120°.

[0024] Based on the above technical solutions, preferably, the side of the conical wheel away from the turntable is located between the two ends of the extrusion wheel, and the distance between the end of the extrusion wheel near the turntable and the side of the conical wheel away from the turntable is L, wherein 0.4mm≤L≤0.6mm.

[0025] Based on the above technical solutions, preferably, multiple support frames, rotating wheels and extrusion wheels are provided, and the support frames, rotating wheels and extrusion wheels correspond one-to-one.

[0026] The anti-collapse flattening wheel structure for cylindrical lithium batteries of this invention has the following advantages over the prior art:

[0027] (1) By setting a cone wheel, a holding part and a squeezing wheel, not only can the end face of the electrode be flattened, but the outer and inner rings of the electrode can also be limited to prevent the electrode from expanding outward after flattening. By allowing the squeezing wheel to rotate independently, the size of the squeezing wheel can be reduced and the flattening efficiency and flattening quality of the electrode can be improved.

[0028] (2) By setting a fixing part and a reinforcing rod, the fixing firmness of the rotating wheel and the extrusion wheel can be improved, the running stability of the rotating wheel and the extrusion wheel can be guaranteed, and the kneading quality of the electrode ear can be further improved.

[0029] (3) By limiting the relative position and specifications of the cone wheel and the extrusion wheel, the inner expansion of the tab can be further avoided, and the density of the tab edge area after kneading can be improved. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a perspective view of an anti-collapse flattening wheel structure for a cylindrical lithium battery according to the present invention.

[0032] Figure 2 This is a cross-sectional view of an anti-collapse flattening wheel structure for a cylindrical lithium battery according to the present invention.

[0033] Figure 3 This is a cross-sectional view of the rotating wheel in an anti-collapse flattening wheel structure for a cylindrical lithium battery according to this utility model.

[0034] Figure 4 This is a front view of the rotating wheel in an anti-collapse flattening wheel structure for a cylindrical lithium battery according to this utility model.

[0035] Figure 5 This is a cross-sectional view of the extrusion wheel in an anti-collapse flattening wheel structure for a cylindrical lithium battery according to this utility model.

[0036] The components are: 1. Turntable; 2. Support frame; 21. Fixing rod; 22. Rotating rod; 23. Mounting rod; 231. Connecting rod; 232. Supporting plate; 3. Rotating wheel; 31. Conical wheel; 32. Supporting part; 33. Fixing part; 4. Extrusion wheel; 5. Reinforcing rod; 6. Pole lug. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] In the production process of all-tab cylindrical lithium 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.

[0040] This utility model discloses an anti-collapse flattening wheel structure for cylindrical lithium batteries, comprising a turntable 1, a support frame 2, a rotating wheel 3, a pressing wheel 4, and a reinforcing rod 5. It can not only flatten the tabs 6 at the end of the core, but also limit the inner and outer rings of the flattened tabs 6 to prevent the flattened tabs 6 from expanding outward, thus ensuring the overall performance of the battery.

[0041] The rotating wheel 3 includes a conical wheel 31 and a supporting part 32. A support frame 2 is fixedly mounted on the turntable 1. The conical wheel 31 is rotatably mounted on the support frame 2. The supporting part 32 is coaxially fixed to one end of the conical wheel 31. The pressing wheel 4 is rotatably mounted on the support frame 2 and located at the end of the conical wheel 31 furthest from the supporting part 32. Figure 2As shown, when the turntable 1 is connected to the output end of a rotating drive device such as a motor, and the turntable 1 moves downward, the side wall of the conical wheel 31 abuts against the end of the tab 6, thereby flattening the tab 6 and making the tab 6 a dense solid. At the same time, the holding part 32 and the squeezing wheel 4 abut against the outer ring and inner ring of the tab 6 respectively, which can prevent the flattened tab 6 from expanding outward to the side of the core, and can also prevent the flattened tab 6 from expanding outward to the center hole of the core, thereby improving the density of the edge area of ​​the flattened tab 6 and ensuring the overall performance of the battery.

[0042] During the kneading process, friction occurs between the conical wheel 31, the supporting part 32, and the extrusion wheel 4 and the tab 6, allowing the conical wheel 31, the supporting part 32, and the extrusion wheel 4 to rotate around their own axis. This avoids wear on the tab 6 and improves the kneading quality of the tab 6.

[0043] Since the rotating shafts of the extrusion wheel 4 and the cone wheel 31 are different, the extrusion wheel 4 is designed to be relatively small and will not occupy too much space. Therefore, multiple support frames 2, multiple rotating wheels 3 and multiple extrusion wheels 4 can be set on the turntable 1, so that the multiple support frames 2, multiple rotating wheels 3 and multiple extrusion wheels 4 correspond one-to-one, thereby improving the kneading efficiency of the tab 6.

[0044] like Figure 1 and Figure 2 As shown, the rotating wheel 3 also includes a fixing part 33, which is coaxially fixed to the end of the supporting part 32 away from the conical wheel 31, and is rotatably connected to the reinforcing rod 5 fixed on the turntable 1, so as to avoid vibration or deflection of the conical wheel 31, the supporting part 32 and the extrusion wheel 4 when supporting the tab 6, thereby improving the running stability of the rotating wheel 3 and the extrusion wheel 4, and further improving the kneading quality and efficiency of the flattening structure for the tab 6.

[0045] To further improve the connection stability between the rotating wheel 3 and the support frame 2, the fixing part 33 is also rotatably connected to the support frame 2; specifically, as shown in... Figure 2 As shown, it is preferable to allow the fixed part 33 and the conical wheel 31 to be rotatably connected to the support frame 2 through a bearing, and to allow the end of the conical wheel 31 close to the fixed part 33 and the abutment part 32 to be spaced apart from the support frame 2, thereby reducing the wear of the wheel 3 and the support frame 2 and ensuring their rotational performance.

[0046] The support frame 2 includes a fixed rod 21, a rotating rod 22 and a mounting rod 23. The fixed rod 21 is fixedly mounted on the turntable 1, one end of the rotating rod 22 is fixedly mounted on the fixed rod 21, and the mounting rod 23 is fixedly mounted on the end of the rotating rod 22 away from the fixed rod 21.

[0047] like Figure 2As shown, the conical wheel 31 is rotatably mounted on the rotating rod 22. The conical wheel 31 is conical in shape, and the rotating rod 22 is inclined to the turntable 1 so that the bottom side of the conical wheel 31 is parallel to the turntable 1, thereby evenly flattening the tab 6. The extrusion wheel 4 is rotatably mounted on the mounting rod 23, and the mounting rod 23 is inclined to the rotating rod 22, so that the extrusion wheel 4 can support the inner ring of the tab 6.

[0048] Mounting rod 23 includes connecting rod 231 and abutment plate 232, such as Figure 5 As shown, one end of the connecting rod 231 is fixedly mounted on the rotating rod 22, the abutment plate 232 is fixedly mounted on the connecting rod 231, and the extrusion wheel 4 is rotatably mounted on the connecting rod 231, with the bottom end of the extrusion wheel 4 abutting against the abutment plate 232. Figure 2 As shown, when the extrusion wheel 4 extends into the inner ring of the tab 6 and abuts against the tab 6, the friction between the tab 6 and the extrusion wheel 4 can cause the extrusion wheel 4 and the connecting rod 231 to rotate, while the supporting plate 232 can support the extrusion wheel 4 and prevent the extrusion wheel 4 from separating from the connecting rod 231.

[0049] Preferably, the connecting rod 231 is perpendicular to the turntable 1, so that the rotation axis of the extrusion roller 4 is parallel to the axis of the electrode tab 6, thereby improving the uniformity of the extrusion roller 4's resistance to the electrode tab 6.

[0050] like Figure 5 As shown, the angle between the circumference of the cone wheel 31 and the circumference of the extrusion wheel 4 is A. By adjusting the angle A, the shape of the corner of the tab 6 after flattening can be changed, so that the tab 6 can be adapted to different processing requirements.

[0051] The angle of A can be set by adjusting the shape of the extrusion roller 4, such as... Figure 5 As shown, when the extrusion roller 4 is a cylindrical structure, A = 90°, the corner of the flattened tab 6 at this position is a right angle. When the extrusion roller 4 is a conical structure that is thicker at the top and thinner at the bottom, the corner of the flattened tab 6 at this position is an obtuse angle, making the corner of the flattened tab 6 thicker.

[0052] In some embodiments, A = 90° to 120°, that is, the angle between the circumference of the conical wheel 31 and the circumference of the extrusion wheel 4 is 90°, 105° or 120°, etc. When 90°≤A≤95°, the corner of the electrode tab 6 that abuts against the extrusion wheel 4 after flattening is a right angle. When 100°≤A≤120°, the corner of the electrode tab 6 that abuts against the extrusion wheel 4 after flattening is an obtuse angle, making the flattened electrode tab 6 more compact.

[0053] In some embodiments, such as Figure 3 As shown, after kneading, the top of the tab 6 is preferably gathered inward by 0.5mm to ensure the density of the edge of the tab 6 after kneading.

[0054] Furthermore, it is preferable to have the extrusion roller 4 have a conical structure that is thicker at the top and thinner at the bottom, with a cone angle of 45° to 60°.

[0055] like Figure 5 As shown, the distance between the extrusion wheel 4 and the bottom right end of the cone wheel 31 is W. The side of the cone wheel 31 away from the turntable 1 is located between the two ends of the extrusion wheel 4. The distance between the end of the extrusion wheel 4 near the turntable 1 and the side of the cone wheel 31 away from the turntable 1 is L. That is, the top of the extrusion wheel 4 is located above the bottom side of the cone wheel 31, and the distance between the two is L.

[0056] In some embodiments, 0.4mm≤L≤0.6mm and W=0.5mm can not only avoid interference between the extrusion roller 4 and the conical roller 31, but also prevent the edges of the tab 6 from extending into the gap between the extrusion roller 4 and the conical roller 31 after kneading, thus ensuring the kneading quality of the tab 6.

[0057] like Figure 5 As shown, the length of the extrusion wheel 4 and the supporting plate 232 extending out of the extrusion wheel 4 and supporting it is H.

[0058] In some embodiments, it is assumed that the height of the tab 6 after kneading is H0, where H0-H≥0.3mm, to avoid squeezing and collision between the extrusion roller 4 and the support plate 232 and components such as the diaphragm.

[0059] Both the extrusion roller 4 and the rotating roller 3 are made of non-metallic materials that cannot conduct electricity, so as to avoid electrical conductivity between them and the core.

[0060] The method of using the anti-collapse flattening wheel structure for cylindrical lithium batteries according to this utility model is as follows:

[0061] First, connect turntable 1 to the output end of the rotation drive device, so that turntable 1 rotates around its axis. Then, fix the core and place the tab 6 to be flattened at the top of the core. Finally, move turntable 1 and use the side wall of conical wheel 31 to squeeze the top of tab 6. Use extrusion wheel 4 and holding part 32 to limit the inner and outer rings of tab 6 respectively until tab 6 is flattened into a dense solid of the required thickness. Then, move turntable 1 away from the core.

[0062] 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 flattening and anti-collapse structure for cylindrical lithium batteries, characterized in that: It includes a turntable (1), a support frame (2), a rotating wheel (3), and an extrusion wheel (4), wherein, The support frame (2) is fixedly mounted on the turntable (1); The rotating wheel (3) includes a conical wheel (31) and a supporting part (32). The conical wheel (31) is rotatably mounted on the support frame (2). The periphery of the conical wheel (31) is used to flatten the end face of the electrode (6). The supporting part (32) is coaxially fixed to one end of the conical wheel (31) and is used to support the outer ring of the electrode (6). The extrusion wheel (4) is rotatably mounted on the support frame (2) and located at the end of the cone wheel (31) away from the abutment (32). The extrusion wheel (4) is used to abut the inner ring of the tab (6).

2. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in claim 1, characterized in that: It also includes a reinforcing rod (5), and the wheel (3) also includes a fixing part (33), wherein, The fixing part (33) is coaxially fixed to one end of the supporting part (32) away from the conical wheel (31); The reinforcing rod (5) is fixedly mounted on the turntable (1) and is rotatably connected to the fixing part (33).

3. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in claim 2, characterized in that: The fixing part (33) is rotatably connected to the support frame (2).

4. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in claim 1, characterized in that: The support frame (2) includes a fixed rod (21), a rotating rod (22), and a mounting rod (23), wherein, The fixing rod (21) is fixedly mounted on the turntable (1); One end of the rotating rod (22) is fixedly mounted on the fixed rod (21) and is rotatably connected to the conical wheel (31); The mounting rod (23) is fixedly disposed at one end of the rotating rod (22) away from the fixed rod (21) and is rotatably connected to the extrusion wheel (4).

5. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in claim 4, characterized in that: The mounting rod (23) includes a connecting rod (231) and a supporting plate (232), wherein, One end of the connecting rod (231) is fixedly mounted on the rotating rod (22), and the extrusion wheel (4) is rotatably mounted on the connecting rod (231); The abutment plate (232) is fixedly mounted on the connecting rod (231) and abuts against the bottom end of the extrusion wheel (4).

6. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in claim 5, characterized in that: The connecting rod (231) is perpendicular to the turntable (1).

7. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in any one of claims 1-6, characterized in that: The circumference of the extrusion wheel (4) is tapered, and the outer diameter of the extrusion wheel (4) gradually decreases in the direction away from the turntable (1).

8. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in claim 7, characterized in that: The angle between the periphery of the cone wheel (31) and the periphery of the extrusion wheel (4) is A, where A = 90°~120°.

9. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in any one of claims 1-6, characterized in that: The side of the conical wheel (31) away from the turntable (1) is located between the two ends of the extrusion wheel (4). The distance between the end of the extrusion wheel (4) near the turntable (1) and the side of the conical wheel (31) away from the turntable (1) is L, where 0.4mm≤L≤0.6mm.

10. The anti-collapse flattening wheel structure for cylindrical lithium batteries as described in any one of claims 1-6, characterized in that: Multiple support frames (2), rotating wheels (3) and extrusion wheels (4) are provided, and the support frames (2), rotating wheels (3) and extrusion wheels (4) correspond one-to-one.

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